WO2013187375A1 - Absorbent and absorbent article obtained using same - Google Patents
Absorbent and absorbent article obtained using same Download PDFInfo
- Publication number
- WO2013187375A1 WO2013187375A1 PCT/JP2013/065985 JP2013065985W WO2013187375A1 WO 2013187375 A1 WO2013187375 A1 WO 2013187375A1 JP 2013065985 W JP2013065985 W JP 2013065985W WO 2013187375 A1 WO2013187375 A1 WO 2013187375A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- region
- water
- absorber
- weight
- absorbing polymer
- Prior art date
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
- A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
- A61F13/533—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having discontinuous areas of compression
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530131—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
Definitions
- the present invention relates to an absorbent body and an absorbent article using the same.
- an absorbent body having a concavo-convex structure and an absorbent article having the same are known.
- the first region where the content ratio of the polymer absorber disposed on the inner sheet side is high and the content ratio of the polymer absorber disposed on the outer sheet side are higher than those of the first region.
- a disposable diaper is described that includes an absorbent body having a low second region bag and a space penetrating from the second region into the first region. According to the disposable diaper described in Patent Document 1, gel blocking can be prevented.
- the core is divided into an absorbent core having a particle layer mainly composed of superabsorbent polymer particles and a fiber layer mainly composed of pulverized pulp laminated on the particle layer,
- a disposable diaper is described that has an absorbent core that is seen through the particle layer in a segmented area. According to the disposable diaper described in Patent Document 2, even if the particle layer forms gel blocking, the fiber layer laminated under the particle layer may be used in some cases.
- Patent Document 1 neither Patent Document 1 nor Patent Document 2 describes anything about positively generating gel blocking of the water-absorbing polymer.
- the second region having a penetrating space has a low content ratio of the polymer absorber and a high content ratio of the hydrophilic fiber. The thickness of the region 2 is lost, and the space is closed. As a result, even if gel blocking can be prevented, a sufficient diffusion effect of body fluid cannot be expected, and the amount of body fluid returned in the excretion area increases, resulting in a decrease in dryness.
- the present invention relates to providing an absorber that can satisfy the aforementioned effects.
- the present invention is an absorbent body comprising a water-absorbing polymer and a hydrophilic fiber, wherein the weight ratio of the water-absorbing polymer and the hydrophilic fiber (weight of the water-absorbing polymer / weight of the hydrophilic fiber) is 1 or more.
- the present invention relates to an absorbent body having one region and a second region having a higher content of each of the water-absorbing polymer and hydrophilic fiber than the first region.
- the first region and the second region are continuously arranged in the thickness direction, and after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 and after 5 minutes, A recess that penetrates the region in the thickness direction is formed.
- FIG. 1 is the partially broken top view which looked at the disposable diaper which is one Embodiment of the absorbent article of this invention using the absorber which is 1st Embodiment of this invention from the surface sheet side.
- 2 is a cross-sectional view taken along the line II of FIG.
- FIG. 3 is a plan view of the absorbent body used after the disposable diaper of FIG. 4 is a cross-sectional view taken along line II-II in FIG.
- FIG. 5 is a plan view of the absorbent body (before physiological saline absorption) used by the disposable diaper of FIG. 1 as viewed from the back sheet side.
- 6 is a cross-sectional view taken along line III-III in FIG. FIG.
- FIG. 7 is a schematic view showing an example of an absorbent body manufacturing apparatus according to the first embodiment of the present invention.
- FIG. 8 is a schematic cross-sectional view along the width direction of a part (concave portion) on the outer peripheral surface side of the rotating drum shown in FIG.
- FIG. 9 is a schematic cross-sectional view showing a state where an absorbent material is deposited in the concave portion of the rotating drum shown in FIG.
- FIG. 10 is the top view which looked at the absorber (before physiological saline absorption) which is 2nd Embodiment of this invention from the surface sheet side.
- 11 is a cross-sectional view taken along line IV-IV in FIG.
- FIG. 1 shows a partially broken plan view of the disposable diaper 1 of the embodiment as viewed from the top sheet side
- FIG. 2 shows a cross-sectional view taken along the line II of FIG. 3 shows a plan view of the absorbent body 4A (after absorption of physiological saline) used by the disposable diaper of FIG. 1
- FIG. 4 shows a cross-sectional view taken along the line II-II of FIG. 5 shows a plan view of the absorbent body 4A (before physiological saline absorption) used by the disposable diaper of FIG. 1
- FIG. 6 shows a cross-sectional view taken along the line III-III of FIG.
- the disposable diaper 1 of the present embodiment (hereinafter also referred to as “diaper 1”) has a top sheet 2 disposed on the skin facing surface side and a back surface disposed on the non-skin facing surface side.
- the sheet 3 and the vertically long absorbent body 4A of the first embodiment (hereinafter also referred to as “absorber 4A”) disposed between the two sheets 2 and 3 are provided.
- the diaper 1 is formed symmetrically with respect to a center line CL extending in the vertical direction.
- the diaper 1 has a ventral portion A in the longitudinal direction (hereinafter also referred to as “Y direction”.
- Y direction a direction parallel to the center line CL).
- a back side portion B and a crotch portion C positioned between these A and B.
- the abdomen A is a part located on the wearer's abdomen when the diaper is worn
- the dorsal part B is a part located on the wearer's back
- the crotch C is located on the inseam of the wearer. It is a part to do.
- the crotch part C is located in the central part of the diaper 1 in the vertical direction (Y direction).
- the direction orthogonal to the vertical direction (Y direction) will be described as the horizontal direction of the diaper 1 (hereinafter also referred to as “X direction”).
- the “skin facing surface” is a surface disposed on the skin side of the wearer when worn, out of the front and back surfaces of each member such as the surface sheet 2 constituting the diaper 1.
- the “surface” is a surface that is directed to the side opposite to the skin side of the wearer when wearing, out of the front and back surfaces of each member such as the surface sheet 2.
- the diaper 1 has left and right side edges of the abdominal side A and left and right side edges of the back side B extending laterally (X direction) outward from the left and right side edges of the crotch C. ing.
- the left and right side edges of the crotch part C are curved in an arc shape inward in the lateral direction (X direction), and the central part in the longitudinal direction (Y direction) is constricted inward as a whole.
- the top sheet 2 and the back sheet 3 respectively extend outward from the left and right side edges and front and rear side edges of the absorbent body 4A.
- the surface sheet 2 has a lateral dimension (X direction) smaller than a lateral dimension (X direction) of the back sheet 3.
- Each of the top sheet 2 and the back sheet 3 is joined to each other directly or through another member at the extended portion extending outward from the periphery of the absorber 4A, and sandwiches and fixes the absorber 4A. is doing.
- the diaper 1 is a so-called unfolded diaper.
- a pair of fastening tapes 7 and 7 are provided on the left and right edges of the back side B, and the outer surface (non-skin) of the abdominal side A is provided.
- a landing tape 8 for fastening the fastening tapes 7 is provided on the opposing surface.
- a three-dimensional gather forming sheet 62 having elastic members 61 fixed in an expanded state in the Y direction is provided on both side portions along the longitudinal direction (Y direction) of the diaper 1.
- a pair of three-dimensional gathers 6 and 6 are formed by being arranged and fixed on the side portions. Moreover, as shown in FIG.
- the leg elastic member 63 for leg gather formation is distribute
- Leg gathers are formed by the contraction of the leg elastic members 63.
- the waist part elastic member 64 for waist gathers formation is distribute
- the absorbent body of the present invention includes a water-absorbing polymer 41 and hydrophilic fibers 42 as shown in FIG.
- the absorbent body of the present invention has a first region 4F and a second region 4S
- the absorbent body 4A of the first embodiment further has a third region 4T.
- the second region 4S is disposed on the non-skin facing surface side of the first region 4F
- the third region 4T is disposed on the non-skin facing surface side of the second region 4S.
- the first region 4F, the second region 4S, and the third region 4T are continuously arranged in the thickness direction (T direction).
- first region 4F, the second region 4S, and the third region 4T are integrally formed.
- “being integrally formed” means that the first region 4F, the second region 4S, and the third region 4T are integrated so as not to be separated from each other without using a bonding means such as an adhesive or heat fusion.
- a bonding means such as an adhesive or heat fusion.
- the first region 4F of the absorbent body of the present invention is in a dry state (state before supplying a 0.9 wt% sodium chloride aqueous solution (hereinafter also referred to as “state before liquid absorption”) or after supply.
- the weight ratio of the water-absorbing polymer 41 to the hydrophilic fiber 42 is 1 or more.
- Weight / weight of hydrophilic fiber is 1 or more, preferably 1.2 or more, more preferably 1.5 or more, and 5 or less, preferably 3 or less, more preferably 1.8 or less, more specifically.
- the weight (basis weight) of the water-absorbing polymer 41 in the first region 4F is 50 g / m 2 or more, preferably 80 g / m 2 or more, and 500 g / m 2 or less, preferably 300 g / m 2 or less, more preferably 110 g / m 2 or less, more specifically 50 g / m 2 or more and 500 g / m 2 or less, more preferably 80 g / m 2 or more and 300 g / m 2 or less, more preferably 80 g / m 2 or more.
- the weight (basis weight) of the hydrophilic fibers 42 in the first region 4F is 20 g / m 2 or more, preferably 40 g / m 2 or more, more preferably 50 g / m 2 or more, and 300 g / m 2 or less, preferably 200 g / m 2 or less, more preferably 80 g / m 2 or less, more specifically 20 g / m 2 or more and 300 g / m 2 or less, and preferably 40 g / m 2 or more and 200 g / m 2 or less. Is more preferably 50 g / m 2 or more and 80 g / m 2 or less.
- the second region 4S of the absorbent body of the present invention is a region in which the content of each of the water absorbent polymer 41 and the hydrophilic fiber 42 is larger than that of the first region 4F in the dry state.
- the weight ratio of the polymer 41 to the hydrophilic fiber 42 is 1 or more.
- the weight ratio (weight of water-absorbing polymer / weight of hydrophilic fiber) of the second region 4S in the absorbent body 4A is 1 or more, preferably 1.2 or more, and 5 or less, preferably 3 or less, more preferably 2 More specifically, it is preferably 1 or more and 5 or less, more preferably 1 or more and 3 or less, and further preferably 1.2 or more and 2 or less.
- the weight (basis weight) of the water-absorbing polymer 41 in the second region 4S is 60 g / m 2 or more, preferably 100 g / m 2 or more, more preferably 170 g / m 2 or more, and 700 g / m 2 or less, preferably 400 g / m 2 or less, more preferably 200 g / m 2 or less, more specifically 60 g / m 2 or more and 700 g / m 2 or less, preferably 100 g / m 2 or more and 400 g / m 2 or less. Is more preferably 170 g / m 2 or more and 200 g / m 2 or less.
- the weight (basis weight) of the hydrophilic fiber 42 in the second region 4S is 30 g / m 2 or more, preferably 60 g / m 2 or more, more preferably 90 g / m 2 or more, and 400 g / m 2 or less, preferably 300 g / m 2 or less, more preferably 150 g / m 2 or less, more specifically 30 g / m 2 or more and 400 g / m 2 or less, preferably 60 g / m 2 or more and 300 g / m 2 or less. Is more preferably 90 g / m 2 or more and 150 g / m 2 or less.
- the third region 4T of the absorbent body 4A has a smaller content of each of the water absorbent polymer and the hydrophilic fiber than the second region 4S in the dry state, and the weight ratio of the water absorbent polymer 41 and the hydrophilic fiber 42 (water absorption).
- the weight of the functional polymer / weight of the hydrophilic fiber) is 0.5 or less.
- the weight ratio of the third region 4T in the absorbent body 4A is 0.05 or more, preferably 0.1 or more, more preferably 0.15 or more, and 5 or less, preferably 0.4 or less, more preferably 0.2 or less, more specifically 0.05 or more and 0.5 or less, and preferably 0.1 or more and 0.4 or less.
- the weight (basis weight) of the water-absorbing polymer 41 in the third region 4T is 0 g / m 2 or more, preferably 5 g / m 2 or more, more preferably 10 g / m 2 or more, and 50 g / m 2 or less, preferably 40 g / m 2 or less, more preferably 15 g / m 2 or less, more specifically 0 g / m 2 or more and 50 g / m 2 or less, preferably 5 g / m 2 or more and 40 g / m 2 or less. Is more preferably 10 g / m 2 or more and 15 g / m 2 or less.
- the weight (basis weight) of the hydrophilic fibers 42 in the third region 4T is 0 g / m 2 or more, preferably 10 g / m 2 or more, more preferably 50 g / m 2 or more, and 150 g / m 2 or less, preferably 100 g / m 2 or less, more preferably 70 g / m 2 or less, more specifically 0 g / m 2 or more and 150 g / m 2 or less, preferably 10 g / m 2 or more and 100 g / m 2 or less. Is more preferably 50 / m 2 or more and 70 g / m 2 or less.
- region 4T is as follows. Using a single-edged razor made by Feather on an arbitrary place of the absorbent body 4A in a state before supplying a 0.9 wt% sodium chloride aqueous solution (hereinafter also referred to as “state before liquid absorption”) to a 1 cm square. Cut and get 10 pieces.
- Ten small pieces obtained by cutting are cut along a boundary in a cross-sectional direction defined by a method to be described later using a single blade razor manufactured by Feather, and the first region is taken out.
- the water-absorbing polymer is removed from the first region of the small piece, the hydrophilic fiber and the water-absorbing polymer are separated, and measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point).
- the respective weights of the conductive fiber and the water-absorbing polymer are determined.
- the water-absorbing polymer and the hydrophilic fiber are separated using a sieve having an opening of 2 mm.
- the basis weight of the water-absorbing polymer and hydrophilic fibers in the first region 4F is calculated by dividing the determined weight by the area per piece.
- the basic weight of the water-absorbing polymer and the hydrophilic fiber in the second region and the third region is calculated.
- the boundary between the first region 4F and the second region 4S is a portion where the contents of the water-absorbing polymer 41 and the hydrophilic fiber 42 increase in the manufacturing stage of the absorbent body.
- the boundary between the second region 4S and the third region 4T in the case of having the third region 4T as in the absorber 4A is the weight ratio (weight of the water-absorbing polymer / hydrophilicity) in the manufacturing stage of the absorber.
- the equal line located farthest from the first region 4F is defined as the boundary between the second region 4S and the third region 4T.
- B When the depth of the concave portion is greater than 80% of the thickness of the absorber (thickness of the convex portion) As shown in FIG. 6, the absorber is viewed in cross section, and the thickness of the absorber is equally divided into four equal parts, Among these, for the sake of convenience, an equal line located at the position farthest from the surface of the absorbent body in which the recesses are formed is defined as a boundary between the first region 4F and the second region 4S.
- region 4T when it has the 3rd area
- a boundary between the second region 4S and the third region 4T is used.
- C When the depth of the concave portion is smaller than 30% of the thickness of the absorber (thickness of the convex portion) As shown in FIG. 6, the absorber is sectioned, and the thickness of the absorber is equally divided into four equal parts, Among them, the uniform line that is closest to the surface of the absorbent body in which the recesses are formed is used as the boundary between the first region 4F and the second region 4S for convenience.
- region 4T when it has the 3rd area
- the water-absorbing polymer and the hydrophilic fiber are tweezers or spatula in ion-exchanged water before drying immediately after cutting with a single blade razor. And so on. Then, it dries and calculates
- 0.9 wt% sodium chloride aqueous solution (physiological saline) was 2000 g / m 2 supplied after 5 minutes state (liquid absorbent The absorber in the later state) is viewed in cross section, the thickness of the absorber and the depth of the recess are measured, and judgment is made according to the following three cases A to C depending on the relationship between the thickness and the depth.
- A When the depth of the concave portion is not less than 30% and not more than 80% of the thickness of the absorbent body (thickness of the convex portion) As shown in FIG.
- a straight line connecting the vertices of the bottoms of the recesses 44 described later is used as a boundary between the first region 4F and the second region 4S.
- region 4T like the absorber 4A as shown in FIG. 4, see a cross section of an absorber and divide the thickness of the absorber 4A into four equal parts,
- the equal line located farthest from the first region 4F is defined as the boundary between the second region 4S and the third region 4T.
- Absorber of the present invention as shown in FIG. 4, the 0.9 wt% aqueous sodium chloride solution (physiological saline) was 2000 g / m 2 supplied after 5 minutes state (state after liquid absorption) A recess 44 that penetrates the second region 4S in the thickness direction (T direction) is formed.
- a recess 44 that penetrates the second region 4S in the thickness direction (T direction) is formed even before the sodium chloride aqueous solution (saline solution) is supplied. Has been.
- the concave portion 44 forms the second region 4S and the third region 4T in the thickness direction (T direction) as shown in FIGS. Has penetrated.
- the “concave portion” is a groove formed in the skin-facing surface or non-skin-facing surface of the absorbent body in the present specification, and includes a groove (hole) penetrating the entire absorbent body in the thickness direction. Meaning.
- the absorbent body 4 ⁇ / b> A includes a block-shaped region 401 including a plurality of concave portions 44 and convex portions 43 partitioned by the plurality of concave portions 44.
- An outer peripheral region 402 is provided over the outer periphery of 401.
- the absorbent body 4 ⁇ / b> A has convex portions 43 constituting the block-shaped region 401 projecting from the topsheet 2 side to the backsheet 3 side, and the outer peripheral region 402 is also a topsheet. It is convex from the 2 side to the back sheet 3 side.
- FIG. 1 in the diaper 1, as shown in FIG.
- region 401 is dented from the back surface sheet 3 side to the surface sheet 2 side. Therefore, the non-skin facing surface side of the absorbent body 4A has an uneven structure, and the skin facing surface side of the absorbent body 4A is flat.
- the recess 44 of the absorbent body 4A is not formed by embossing. Therefore, the basis weight and density of the absorbent material (including the aqueous polymer 41 and the hydrophilic fiber 42) in the concave portion 44 are the same as or lower than the basis weight and density of the absorbent material in the convex portion 43. .
- the body fluid can move smoothly.
- a method for manufacturing such an absorber 4A will be described later. Further, specific basis weight and density in the convex portion 43 and the concave portion 44 will be described later.
- the recess 44 of the absorber 4 ⁇ / b> A includes a plurality of linear (continuous linear) recesses 44 ⁇ / b> X extending in the horizontal direction (X direction) and a plurality of recesses 44 ⁇ / b> X extending in the vertical direction (Y direction). It has a linear (continuous linear) recess 44Y.
- the block-shaped region 401 includes a plurality of linear recesses 44X extending in the horizontal direction (X direction) and a plurality of linear recesses 44Y extending in the vertical direction (Y direction).
- the block-shaped region 401 is formed in a rectangular shape that is long in the vertical direction (Y direction) in the absorber 4A, and the outer peripheral region 402 surrounds the entire outer periphery of the block-shaped region 401 with a constant width. Is formed.
- the total length in the vertical direction (Y direction) is 150 mm or more and 600 mm or less
- the total width in the horizontal direction (X direction) is 20 mm or more and 200 mm before liquid absorption.
- the block-shaped region 401 preferably has a length in the longitudinal direction (Y direction) of 80% or more and 100% or less of the total length of the absorbent body 4A in the Y direction before liquid absorption.
- the block-shaped region 401 is preferably in a state before absorption of the liquid and has a length in the horizontal direction (X direction) of 60% or more and 100% or less of the entire width of the absorbent body 4A in the X direction.
- the total length in the vertical direction (Y direction) is 150 mm or more and 600 mm or less and the total width in the horizontal direction (X direction) is 20 mm or more and 200 mm before liquid absorption.
- the following is preferable.
- the length in the vertical direction (Y direction) of each of both ends in the vertical direction (Y direction) is 5 mm or more and 50 mm or less in a state before liquid absorption. Is preferred.
- the lengths in the horizontal direction (X direction) of both side portions along the vertical direction (Y direction) are also the same.
- the width L1 (see FIG. 1) of the linear recess 44X extending in the lateral direction (X direction) can secure a space in the absorbent body when the absorbent article is used in a disposable diaper, for example, and sufficient diffusion of body fluids. From the viewpoint of effect and quick absorbability, it is preferably 0.5 mm or more and 20 mm or less in a state before liquid absorption.
- the width L2 (see FIG. 1)
- the linear recess 44Y extending in the vertical direction (Y direction) can secure a space in the absorbent body when the absorbent article is used in a disposable diaper, for example, and sufficient diffusion of body fluid. From the viewpoint of effect and quick absorbability, it is preferably 0.5 mm or more and 20 mm or less in a state before liquid absorption.
- the widths L1 and L2 are measured values at the position of the bottom of the recess in the concavo-convex structure of the absorber 4A.
- the convex portion 43 is formed in a rectangular shape that is long in the vertical direction (Y direction) in plan view, as shown in FIGS. 1 and 3.
- the convex portion 43 is formed in a rectangular shape in plan view.
- the four corners may have an arc shape, a polygonal shape, an ellipse, a combination thereof, or the like.
- the convex portion 43 of the diaper 1 sufficiently absorbs bodily fluids and reduces the amount of liquid returned in the excretory part region, in a state before liquid absorption, As shown in FIG.
- the length L3 of the vertical direction (Y direction) is 15 mm or more and 300 mm or less.
- the length L4 of the horizontal direction (X direction) is 5 mm or more and 50 mm or less in the state before liquid absorption.
- the recess 44 (44X, 44Y) can secure a space in the absorbent body and is hydrophilic in a dry state from the viewpoint of a sufficient diffusion effect of body fluid and quick absorbability. It is preferable that the basis weight of the entire absorbent body including the absorbent fiber and the absorbent polymer is not less than 0% and not more than 80% of the basis weight of the convex portion 43. Specifically, the recess 44 (44X, 44Y) is preferably in a dry state and has a basis weight of 0 g / m 2 or more and 400 g / m 2 or less.
- the convex portion 43 is in a dry state, it is preferred that the basis weight of 200 g / m 2 or more 600 g / m 2 or less.
- the basis weight of the convex portion 43 and the concave portion 44 is measured as follows.
- the measuring method of the basic weight of the convex part 43 and the recessed part 44 is as follows. Cut along the boundary line between the convex portion 43 and the concave portion 44 of the absorbent body 4 using a feather blade razor. Ten small pieces of the convex portion 43 obtained by cutting were measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point), and the average weight of one small piece of the convex portion 43 was measured. Ask for. The basis weight of the convex portion 43 is calculated by dividing the obtained average weight by the average area per piece of the convex portion 43.
- the length is 100 mm
- the width is made by Feather Corporation in accordance with the design dimension of the width of the concave portion 44 (44Y).
- Using a single-edged razor cut out five small pieces of thin stripe-shaped recess 44 (44Y). Each of the 5 pieces obtained was measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point), and averaged to obtain the average weight of one piece of the recess 44 (44Y). .
- the basis weight of the low basis weight portion 41 (44Y) is calculated by dividing the obtained average weight by the average area per piece of the recess 44 (44Y). For the recess 44 (44X), the basis weight is calculated in the same manner as the recess 44 (44Y).
- the thickness thereof is 0.5 mm or more, preferably 1 mm, in a state before liquid absorption, from the viewpoint of absorption amount and fit to the body (body compatibility). Or more, more preferably 5 mm or more, and 20 mm or less, preferably 10 mm or less, more preferably 5.5 mm or less, more specifically 0.5 mm or more and 20 mm or less, preferably 1 mm or more and 10 mm or less. More preferably, it is 5 mm or more and 5.5 mm or less.
- the recess 44 (44X, 44Y) can secure a space in the absorber, and from the viewpoint of obtaining a sufficient diffusion effect of body fluid, the depth of the recess 44 (the protrusion 43) is in the state before absorbing the liquid. 20% or more, preferably 25% or more, more preferably 70% or more, and 100% or less, preferably 80% or less, more preferably 75% or less, and more specifically 20% or more 100. % Is preferably 25% or more and 80% or less, and more preferably 70% or more and 75% or less.
- the depth of the recess 44 is 0.1 mm or more, preferably 0.2 mm or more, more preferably 3 mm or more, and 20 mm or less, preferably 10 mm in a state before liquid absorption.
- more preferably 4 mm or less more specifically 0.1 mm or more and 20 mm or less, more preferably 0.2 mm or more and 10 mm or less, and further preferably 3 mm or more and 4 mm or less.
- the depth of the concave portion 44 (44X, 44Y) is the same as the value obtained by subtracting the thickness of the concave portion 44 (44X, 44Y) from the thickness of the absorber 4A (the thickness of the convex portion 43).
- the thickness of the convex part 43 and the recessed part 44 is the state before liquid absorption, for example, the absorber 4A with a sharp razor, the vertical direction (Y direction) shown in FIG. Cut in the X direction) and measure the cross section of the cut sample without applying a load.
- the thickness of the convex portion 43 is a value measured at the thickest position in the convex portion
- the thickness of the concave portion 44 (44X, 44Y) is a value measured at the thinnest position in the concave portion. If it is difficult to measure with the naked eye, the cross section of the cut sample may be observed and measured at a magnification of 10 to 50 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE).
- the absorbent body 4A is used in a disposable diaper, from the viewpoint of a fit to the body after absorbing the body fluid (body compatibility), a 0.9 wt% sodium chloride aqueous solution is supplied at 2000 g / m 2 and 5A.
- the thickness is 1 mm or more, preferably 8 mm or more, more preferably 9 mm or more, and 30 mm or less, preferably 11 mm or less.
- the recess 44 (44X, 44Y) has a depth of 20% or more, preferably 50% or more, more preferably 65% of the thickness of the absorbent body 4A (thickness of the projection 43) in a state after liquid absorption. Or more, and preferably 100% or less, preferably 80% or less, more preferably 75% or less, more specifically 20% or more and 100% or less, and more preferably 50% or more and 80% or less. Preferably, it is 65% or more and 75% or less.
- the depth of the recess 44 is 0.2 mm or more, preferably 2 mm or more, more preferably 5.5 mm or more, and 30 mm or less, preferably 10 mm, in the state after liquid absorption.
- the convex portions 43 are formed at the same density as the concave portions 44 (44X, 44Y) or at a higher density than that.
- the recess 44 (44X, 44Y) can secure a space in the absorbent body, and is in a state before liquid absorption from the viewpoint of sufficient diffusion effect of body fluid and quick absorbability. Therefore, the density is preferably 30% or more and 100% or less of the density of the protrusions 43.
- the recess 44 (44X, 44Y) preferably has a density of 0.01 g / cm 3 or more and 1.2 g / cm 3 or less in a state before liquid absorption.
- the convex portion 43 is in a state before the liquid absorbent, it is preferable that the density is less than 0.01 g / cm 3 or more 1.2 g / cm 3.
- the density of the convex portion 43 and the concave portion 44 (44X, 44Y) is calculated by dividing the basis weight of the convex portion 43 and the low density portion 44 obtained by the above-described method by the respective thickness obtained by the above-described method. .
- the absorbent body 4A of the first embodiment is wrapped with a hydrophilic intermediate sheet 5 as shown in FIG.
- the absorbent body 4A that is long in the longitudinal direction (Y direction) uses one intermediate sheet 5 to fold back both sides of the intermediate sheet 5, and between the side edges of the intermediate sheet 5 on the back sheet 3 side of the absorbent body 4A. Wrapped in layers.
- the intermediate sheet 5 is disposed between the absorber 4 ⁇ / b> A and the top sheet 2, and is disposed between the absorber 4 ⁇ / b> A and the back sheet 3.
- the absorbent body 4 ⁇ / b> A includes the absorbent body 4 having a concavo-convex structure surrounded by the intermediate sheet 5, and a space 9 is formed between the concave portion 44 (44 ⁇ / b> X, 44 ⁇ / b> Y) and the intermediate sheet 5.
- the absorbent body 4 ⁇ / b> A includes the absorbent body 4 having a concavo-convex structure surrounded by the intermediate sheet 5, and a space 9 is formed between the concave portion 44 (44 ⁇ / b> X, 44 ⁇ / b> Y) and the intermediate sheet 5.
- the concave portions 44 (44 X, 44 Y) are formed in a lattice shape as a whole on the back sheet 3 side of the absorber 4, and the positions of the lattice eyes A convex portion 43 is arranged on the top of the concave portion 44, and a concave portion 44 is formed so as to surround the convex portion 43. Accordingly, in the diaper 1, as shown in FIGS.
- a plurality of spaces 9X formed by the recesses 44X recessed on the top sheet 2 side and the intermediate sheet 5 are formed in the lateral direction (X
- a plurality of spaces 9Y formed by the recesses 44Y and the intermediate sheet 5 that are recessed toward the top sheet 2 are continuous in the longitudinal direction (Y direction) corresponding to the recesses 44Y. It extends to.
- the absorbent body 3A includes the water absorbent polymer 41 and the hydrophilic fibers 42, and the absorbent body 3A is characterized by the water absorbent polymer 41 contained therein.
- the water-absorbing polymer 41 is particularly characterized in that the liquid passing rate under pressure is low, and the initial absorption rate measured according to the DW method is slow in the initial stage and becomes fast after a predetermined time has elapsed. have.
- the absorption rate by the DW method is a rate measured using a device (Demand Wetability Tester) generally known as a device for performing the DW method.
- the water-absorbing polymer 41 will be specifically described.
- the water-absorbing polymer 41 has a water absorption amount of 30 g / g or more, preferably 31 g / g or more, and 50 g / g or less, preferably 45 g / g or less, from the viewpoint of preventing water leakage by increasing the water absorption amount. More preferably, it is 40 g / g or less, more specifically 30 g / g or more and 50 g / g or less, more preferably 30 g / g or more and 45 g / g or less, more preferably 31 g / g or more and 40 g / g or less. It is particularly preferred that it is g or less.
- the water absorption amount of the water-absorbing polymer 41 can be determined by a method for measuring the amount of centrifugal retention in accordance with JIS K 7223.
- the centrifugal retention amount of the water-absorbing polymer is a characteristic related to the water absorption amount (water absorption ratio) of the water-absorbing polymer.
- a water-absorbing polymer having a large centrifugal retention amount also has a large water absorption amount.
- the centrifugal retention amount (water absorption amount) is measured according to JIS K 7223 (1996).
- Nylon woven fabric (sold by Sanriki Seisakusho, product name: nylon net, standard: 250 mesh) is cut into a rectangle with a width of 10 cm and a length of 40 cm, folded in half at the center in the longitudinal direction, and heat sealed at both ends to a width of 10 cm
- a nylon bag having an inner dimension of 9 cm and a length of 20 cm is prepared.
- 1.00 g of the water-absorbing polymer as a measurement sample is precisely weighed and placed uniformly at the bottom of the produced nylon bag.
- the nylon bag containing the sample is immersed in physiological saline (0.9 mass% sodium chloride aqueous solution) adjusted to 25 ° C. After 1 hour from the start of immersion, the nylon bag is taken out from the physiological saline, suspended in a vertical state for 1 hour and drained, and then dehydrated using a centrifugal dehydrator (model H-130C special model manufactured by Kokusan Co., Ltd.). The dehydration condition is 143 G (800 rpm) for 10 minutes. After dehydration, the mass of the sample is measured, and the target centrifugal retention amount (water absorption amount) is calculated according to the following formula.
- Centrifugal retention amount (g / g) (a′ ⁇ bc) / c
- a ′ is the total mass (g) of the sample and nylon bag after centrifugal dehydration
- b is the mass (g) of the nylon bag before water absorption (during drying)
- c is the mass of the sample before water absorption (during drying).
- the water-absorbing polymer 41 has an absorption amount under pressure of 2.0 kPa from the viewpoint of firmly absorbing bodily fluids without flowing through the surface of the absorbent body 4A even during pressurization during wearing. 20 g / g or more and 40 g / g or less, preferably 35 g / g or less, more specifically 20 g / g or more and 40 g / g or less, preferably 20 g / g or more and 35 g / g or less. Is more preferable.
- the load of 2.0 kPa substantially corresponds to the body pressure applied to the absorbent body when the absorbent article is worn.
- the amount of absorption under pressure is a measure of how much the water-absorbing polymer can be absorbed in a state where pressure is applied to the absorbent body by wearing the absorbent article.
- ⁇ Measurement method of absorption under pressure The amount of absorption under pressure is measured using a measuring method and measuring apparatus described in JP-A-2003-235889. That is, prepare a nylon mesh with a mesh size of 63 ⁇ m (cylindrical plastic tube (inner diameter 30 mm, height 60 mm) with JIS Z8801-1: 2000 pasted on the bottom. Then, weigh 0.50 g of the sample (water-absorbing polymer) precisely. Then, put the sample on the nylon mesh of a vertical cylindrical plastic tube so that the sample has a substantially uniform thickness, and then apply a weight of 29.5 mm outer diameter x 22 mm thickness so that a load of 2.0 kPa is applied to the sample.
- the water-absorbing polymer 41 easily causes gel blocking in the vicinity of the skin facing surface of the absorbent body 4A at the time of pressurization during wearing, and from the viewpoint of reducing the return of body fluid to the skin side after the body fluid has been absorbed.
- the liquid passing rate under pressure at 2.0 kPa is preferably less than 1 ml / min, and more preferably 0 ml / min to 0.9 ml / min.
- the liquid passing rate under pressure is generally useful as an index of the diffusion / permeation rate of the liquid in the absorber.
- ⁇ Measurement method of liquid flow rate under pressure The liquid passing speed under pressure is measured using a measuring method and measuring apparatus described in JP-A-2003-235889. That is, in a 100 mL glass beaker, a sufficient amount of physiological saline (0.9% by mass sodium chloride aqueous solution) to swell the measurement sample water-absorbing polymer 0.32 ⁇ 0.005 g, for example, water-absorbing polymer saturation. Immerse in physiological saline more than 5 times the amount of absorption and leave for 30 minutes.
- a wire mesh mesh opening 150 ⁇ m, biocolumn sintered stainless steel filter 30SUS sold by Sansho Co., Ltd.
- a capillary with an inner diameter of 2 mm
- a filtration cylindrical tube having an inner diameter of 4 mm and a length of 8 cm is prepared, and the contents of the beaker including the swollen measurement sample are put into the cylindrical tube with the cock closed.
- a cylindrical rod having a diameter of 2 mm with a wire mesh having an opening of 150 ⁇ m and a diameter of 25 mm is inserted into the filtration cylindrical tube so that the wire mesh and the measurement sample are in contact with each other.
- T1 the liquid flow rate under pressure at 2.0 kPa is calculated from the following equation.
- T0 (seconds) is a value obtained by measuring the time required for 20 ml of physiological saline to pass through the wire mesh without putting the measurement sample in the filtering cylindrical tube.
- the water-absorbing polymer 41 absorbs body fluid quickly in the latter period, makes it difficult for the body fluid to return, and shortens the wet state of the wearer's skin, so that the absorption rate measured according to the DW method is 40 ml. / (G ⁇ 10 minutes) or more, preferably 42 ml / (g ⁇ 10 minutes) or more, and 60 ml / (g ⁇ 10 minutes) or less, preferably 55 ml / (g ⁇ 10 minutes) or less, more specifically 40 ml / (g ⁇ 10 minutes) to 60 ml / (g ⁇ 10 minutes), more preferably 42 ml / (g ⁇ 10 minutes) to 55 ml / (g ⁇ 10 minutes).
- the absorption rate by the DW method expresses the behavior in which the water-absorbing polymer absorbs and absorbs bodily fluids, or the behavior in which bodily fluids are taken into the gaps between adjacent water-absorbing polymer particles. It serves as an index of shape retention, particularly the shape retention of the absorbent after absorption of body fluid.
- the water-absorbing polymer 41 makes it difficult to absorb bodily fluids at the initial stage, so that the bodily fluids are taken into the layers 4F, 4S, and 4T of the absorbent body and easily diffused in the planar direction (X direction and Y direction).
- the absorption rate measured according to the method is 5 ml / (g ⁇ 1 min) or more, preferably 8 ml / (g ⁇ 1 min) or more and 13 ml / (g ⁇ 1 min) or less, more specifically 5 ml / (G ⁇ 1 minute) to 13 ml / (g ⁇ 1 minute), preferably 8 ml / (g ⁇ 1 minute) to 13 ml / (g ⁇ 1 minute).
- the absorption rate by the DW method is measured using a measuring method and measuring apparatus described in JP-A-6-136010. That is, it is measured using a Demand Wetability Tester device. Specifically, in this apparatus, the level of the physiological saline solution is set to the same level as the surface of the polymer spray table [70 mm ⁇ , No, 2 filter paper placed on the glass filter No, 1], and the polymer spray is set. Sprinkle 0.3 g of the water-absorbing polymer to be measured on the surface of the table. The amount of water absorption at the time when the water-absorbing polymer is sprayed is 0, and the amount of water absorption is measured after 1 minute and after 10 minutes.
- the amount of water absorption is measured by a burette scale indicating the amount of decrease in the saline water level.
- the obtained water absorption value is defined as an absorption rate by the DW method.
- the measurement is performed at 23 ⁇ 2 ° C. and humidity 50 ⁇ 5%, and the sample is measured after being stored in the same environment for 24 hours or more.
- the above-mentioned water-absorbing polymer 41 has an average particle diameter of 100 ⁇ m or more, preferably 200 ⁇ m or more, and 1000 ⁇ m or less, preferably 500 ⁇ m or less, more specifically, from the viewpoint of dropping off from the product, feeling of use, and suppression of movement. Is preferably 100 ⁇ m or more and 1000 ⁇ m or less, and more preferably 200 ⁇ m or more and 500 ⁇ m or less.
- grains For example, various shapes, such as spherical shape, lump shape, grape shape, and bowl shape, are employable.
- the water-absorbing polymer 41 having the above-described characteristics can be obtained by polymerizing one or more kinds selected from the following monomers as an example. Moreover, a crosslinking process is performed as needed.
- the polymerization method is not particularly limited, and various generally known water-absorbing polymer methods such as a reverse phase suspension polymerization method and an aqueous solution polymerization method can be employed. Thereafter, the polymer is subjected to operations such as pulverization and classification as necessary, and surface treatment is performed as necessary.
- the monomer used for producing the water-absorbing polymer 41 is a monomer that is water-soluble and has a polymerizable unsaturated group. Specifically, olefinic unsaturated carboxylic acid or salt thereof, olefinic unsaturated carboxylic acid ester, olefinic unsaturated sulfonic acid or salt thereof, olefinic unsaturated phosphoric acid or salt thereof, olefinic unsaturated phosphate ester And vinyl monomers having polymerizable unsaturated groups such as olefinically unsaturated amines, olefinically unsaturated ammonium salts, and olefinically unsaturated amides.
- Examples of the olefinic unsaturated carboxylic acid or salt thereof include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid and fumaric acid, alkali metal salts and ammonium salts thereof.
- olefinic unsaturated carboxylic acid esters examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, polyethylene glycol mono (meth) acrylate, and phenoxypolyethylene glycol (meth). An acrylate etc. are mentioned.
- olefinic unsaturated sulfonic acids or salts thereof examples include vinyl sulfonic acid, allyl sulfonic acid, styrene sulfonic acid, 2- (meth) acrylamide-2-methylpropane sulfonic acid, 2- (meth) acryloylethane sulfonic acid, 2- (Meth) acryloylpropane sulfonic acid or a salt thereof may be mentioned.
- Examples of the olefinic unsaturated phosphoric acid or a salt thereof include (meth) acryloyl (poly) oxyethylene phosphoric acid ester or a salt thereof.
- Examples of the olefinic unsaturated amine include N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, and N, N-dimethylaminopropyl. (Meth) acrylamide etc. are mentioned.
- olefinic unsaturated ammonium salt examples include quaternary ammonium salts of the above olefinically unsaturated amines.
- Examples of the olefinic unsaturated amide include (meth) acrylamide, methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-propyl (meth) acrylamide, N-isopropyl (meth) acrylamide, N, N-dimethyl (meth) ) (Meth) acrylamide derivatives such as acrylamide, vinylmethylacetamide and the like.
- nonionic hydrophilic group-containing unsaturated monomers such as vinylpyridine, N-vinylpyrrolidone, N-acryloylpiperidine, N-acryloylpyrrolidine, and N-vinylacetamide.
- (meth) acrylate means acrylate or methacrylate
- (meth) acrylamide means acrylamide or methacrylamide
- (meth) acryloyl means acryloyl or methacryloyl.
- olefinic unsaturated carboxylic acids or salts thereof are preferred, acrylic acid, methacrylic acid, alkali metal salts, alkaline earth metal salts or ammonium salts thereof are more preferred, and acrylic acid, alkali metal acrylate salts. (Lithium salt, sodium salt, potassium salt, etc.) and ammonium acrylate are further preferred.
- crosslinking agent examples include N, N-diallylacrylamide, diallylamine, triallylamine, diallylmethacrylamide, diallyl phthalate, diallyl malate, diallyl terephthalate, triallyl cyanurate, triallyl isocyanurate, triallyl phosphate, tetraallyloxy.
- Polyallyl compounds such as ethane and pentaerythritol triallyl ether poly (meth) allyloxyalkanes; divinylbenzene, N, N'-methylenebis (meth) acrylamide, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol Di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane di (meth) acrylate, glycerin tri (meth) acrylate , Polyvinyl compounds such as glycerin acrylate methacrylate, ethylene oxide modified trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate; ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, Polyglycid
- Ethylene glycol diethylene glycol, propylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, 1,3-propanediol, dipropylene glycol, 2,2,4-trimethyl-1,3-pentanediol, polypropylene glycol, glycerin, Polyglycerol, 2-butene-1,4-diol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,2-cyclohexanedimethanol, , 2-cyclohexanol, trimethylolpropane, diethanolamine, triethanolamine, polyoxypropylene, oxyethylene-oxypropylene block copolymer, pentaerythritol, sorbitol, etc. May be used alcohol compounds, these can be used alone or in admixture.
- the polymer particles obtained by using a polymer compound having a functional group can be subjected to surface treatment.
- the polymer compound include polyethyleneimine, polyvinyl alcohol, Examples include allylamine.
- this high molecular compound may be used independently, you may use together with said various crosslinking agent.
- the amount of the crosslinking agent having two or more polymerizable unsaturated groups or the crosslinking agent having two or more reactive groups may be any amount according to the desired performance of the water-absorbing polymer of the final product.
- wt% or more preferably 0.01 wt% or more, and 20 wt% or less with respect to the total polymerizable monomer (polymerizable monomer other than the crosslinking agent having two or more polymerizable unsaturated groups).
- it is 1 wt% or less, more specifically 0.001 wt% or more and 20 wt% or less, and more preferably 0.01 wt% or more and 1 wt% or less.
- a crosslinking agent or an aqueous solution thereof a hydrophilic organic solvent, an acid or a pH buffering agent may be mixed and used.
- surface treatment agents include surface modifying oils such as modified silicones; polyvalent metal compounds such as aluminum sulfate, potassium alum, ammonium alum, sodium alum, (poly) aluminum chloride, and their hydrates; And cationic compounds such as dialkylamine and salts thereof; polycation compounds such as polyethyleneimine, polyvinylamine, and polyallylamine; and salts thereof; inorganic fine particles such as silica, alumina, titanium oxide, zinc oxide, and bentonite; Only 1 type may be used and 2 or more types may be used together.
- surface modifying oils such as modified silicones
- polyvalent metal compounds such as aluminum sulfate, potassium alum, ammonium alum, sodium alum, (poly) aluminum chloride, and their hydrates
- cationic compounds such as dialkylamine and salts thereof
- polycation compounds such as polyethyleneimine, polyvinylamine, and polyallylamine
- inorganic fine particles such as silica,
- the surface treatment it is necessary to perform the surface treatment to such an extent that gel locking occurs at a utilization efficiency of the water-absorbing polymer (here, the same meaning as the swelling ratio) of 50 to 70%.
- various additives can coexist in a range that does not adversely affect the polymer.
- specific examples of such additives include starch-cellulose, starch-cellulose derivatives, polyvinyl alcohol, polyacrylic acid (salt), crosslinked polyacrylic acid (salt), polyethylene glycol, polyvinylpyrrolidone, and the like.
- Polymerization inhibitors such as auxiliaries and quinones, chain transfer agents, chelating agents and the like.
- the hydrophilic fibers constituting the absorbent body 4A together with the water-absorbing polymer 41 include (1) softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), and thermomechanical pulp (TMP). ), Etc.
- the hydrophilic fibers are preferably natural cellulose fibers or regenerated cellulose fibers, and more preferably pulp fibers made of wood pulp.
- the pulp fiber mentioned here includes ECF (elementary chlorin-free) bleached pulp and TCF (total chlorin-free) bleached pulp that do not use a chlorine compound for pulp bleaching.
- ECF elementary chlorin-free
- TCF total chlorin-free
- the above-mentioned various hydrophilic fibers can be used singly or in combination of two or more.
- the diaper 1 is formed by an adhesive (hot melt adhesive or the like) applied between the top sheet 2 and the absorbent body 4A, and between the absorbent body 4A and the back sheet 3 in a pattern such as a dot, spiral, or stripe. They are fixed to each other.
- an adhesive hot melt adhesive or the like
- FIG. 7 shows an embodiment of a method for manufacturing the absorbent body 4A and a manufacturing apparatus used therefor.
- the manufacturing apparatus of the absorbent body 4A includes a rotating drum 50 that is rotationally driven in the direction of arrow R1, and an absorbent material 45 that includes a water-absorbing polymer 41 and hydrophilic fibers 42 that are raw materials of the absorbent body 4A on the outer peripheral surface of the rotating drum 50.
- the duct 60 for supplying A disposed vacuum box 65, and a mesh belt 75 that is a sheet-like air-permeable member disposed so as to pass between the vacuum box 65 and the rotary drum 50 and between the transfer roll 70 and the rotary drum 50; And a vacuum conveyor 80 disposed below the transfer roll 70.
- the rotating drum 50 has a cylindrical shape, and receives power from a prime mover such as a motor, so that members forming the outer peripheral surface rotate around a horizontal axis.
- a space 56 capable of depressurizing the inside is formed in a non-rotating portion inside the rotating drum 50 (on the rotating shaft side).
- a known exhaust device such as an intake fan is connected to the space 56, and the interior of the space 56 can be maintained at a negative pressure by operating the exhaust device.
- piping (not shown) capable of taking in air outside the apparatus is connected to the spaces 57 and 58 on the inner side (rotating shaft side) of the rotating drum 50.
- a plurality of drum recesses 51 having a shape corresponding to the shape of the absorbent body 4A to be manufactured are formed on the outer peripheral surface of the rotating drum 50 at equal intervals in the R1 direction.
- a mesh plate 52 in which a large number of pores are formed and a metal or resin impermeable member 53 are arranged on the bottom surface of each drum recess 51.
- the air-impermeable member 53 is provided so as to protrude on the mesh plate 52, and is disposed so as to correspond to the shape and position of the concave portion 44 (44X, 44Y) described above.
- a region 55 consisting only of the mesh plate 52 in the entire outer periphery of the portion is a portion corresponding to the outer peripheral region 402.
- the part of the outer peripheral surface of the rotating drum 50 in which the drum recessed part 51 is not formed consists of the frame body of the rotating drum 50 which consists of metal rigid bodies, and is non-breathable.
- one end side of the duct 60 covers the outer peripheral surface of the rotary drum 50 positioned on the space 56 maintained at a negative pressure, and the other end side (not shown) has a fiber material introduction device.
- the fiber material introducing device includes, for example, a pulverizer that pulverizes sheet-like wood pulp to form defibrated pulp, and sends the defibrated pulp (hydrophilic fibers) into the duct.
- a water-absorbing polymer introduction part to be introduced is provided.
- the transfer roll 70 has a cylindrical outer peripheral portion having air permeability, and receives the power from a prime mover such as a motor and the outer peripheral portion rotates in the R2 direction.
- a prime mover such as a motor
- the outer peripheral portion rotates in the R2 direction.
- a space 71 that can be depressurized is formed in the non-rotating portion on the inner side (rotating shaft side) of the transfer roll 70.
- a known exhaust device such as an intake fan is connected to the space 71, and the interior of the space 71 can be maintained at a negative pressure by operating the exhaust device.
- the vacuum box 65 is disposed between the downstream end 601 of the duct 60 and the transfer roll 70 in the rotation direction R1 of the rotary drum 50.
- the vacuum box 65 has a box-like shape, and has an opening that opens in the direction of the rotating drum 50 at a portion facing the rotating drum 50.
- the vacuum box 65 is connected to a known exhaust device (not shown) such as an intake fan via an exhaust pipe 67, and the inside of the vacuum box 65 can be maintained at a negative pressure by the operation of the exhaust device. .
- the mesh belt 75 is a belt-shaped breathable belt having a mesh connected endlessly, and is continuously guided along a plurality of free rolls and transfer rolls 70 to move along a predetermined route.
- the mesh belt 75 is driven by the rotation of the transfer roll 70. While the mesh belt 75 passes in front of the opening of the vacuum box 65, the mesh belt 75 is in contact with the outer peripheral surface of the rotary drum 50, and the transfer roll 70 and the rotary drum 50 are closest to each other. In the vicinity of the portion, the transfer drum 70 moves away from the outer peripheral surface of the rotating drum 50.
- the vacuum conveyor 80 includes an endless breathable belt 83 that is stretched between the drive roll 81 and the driven roll 82, and a vacuum box 84 that is disposed at a position facing the transfer roll 70 with the breathable belt 83 interposed therebetween. ing.
- the exhaust device connected to each of the space 56 in the rotary drum 50 and the vacuum box 65 is operated to make negative pressure. This is because the negative pressure in the space 56 causes an air flow that conveys the absorbent material 45 to the outer peripheral surface of the rotary drum 50 in the duct 60.
- the rotating drum 50 and the transfer roll 70 are rotated, and the vacuum conveyor 80 is operated.
- the fiber material introducing device is operated to supply first defibrated pulp (hydrophilic fibers) into the duct 60.
- the pulp (hydrophilic fiber) rides on the airflow flowing in the duct 60 and is scattered to be supplied toward the outer peripheral surface of the rotating drum 50.
- pulp (hydrophilic fiber) is sucked into the drum recess 51 of the rotary drum 50. As shown in FIG. 9, the pulp (hydrophilic fibers) is gradually deposited on the mesh plate 52 in each region 54 and region 55 of the drum recess 51.
- the pulp (hydrophilic fiber) deposit 40T thus obtained becomes a portion corresponding to the third region 4T.
- the absorbent material 45 rides on the air flow flowing through the duct 60 and is in a scattered state. And supplied toward the outer peripheral surface of the rotating drum 50.
- the supplied absorbent material 45 is mixed so that the weight ratio of the absorbent polymer and pulp (hydrophilic fiber) (weight of absorbent polymer / weight of pulp (hydrophilic fiber)) is 1 or more. .
- the absorptive material (mixture of a fiber material and an absorption polymer) 45 is attracted
- the absorbent material 45 is gradually deposited on the deposit 40 ⁇ / b> T deposited on the mesh plate 52 in each region 54 and region 55 of the drum recess 51.
- the absorbent material deposit 40S on the deposit 40T thus obtained is a portion corresponding to the second region 4S.
- the defibrated pulp (fiber material) and the absorbent polymer are supplied into the duct 60, these absorbent materials 45 ride on the air flow flowing through the duct 60 and become scattered, and the outer periphery of the rotating drum 50. Supplied toward the surface.
- the supplied absorbent material 45 is mixed so that the weight ratio of the absorbent polymer and pulp (hydrophilic fiber) (weight of absorbent polymer / weight of pulp (hydrophilic fiber)) is 1 or more.
- the absorbent material 45 to be supplied is adjusted so that the contents of the absorbent polymer and pulp (hydrophilic fibers) are lower than those of the absorbent material 45 when the deposit 40S is formed. .
- the absorptive material (mixture of a fiber material and an absorption polymer) 45 is attracted
- the absorbent material 45 is gradually deposited on the deposit 40 ⁇ / b> S deposited on the mesh plate 52 in each region 54 and region 55 of the drum recess 51.
- the absorbent material deposit 40F on the deposit 40S thus obtained is a portion corresponding to the first region 4F.
- the deposit 46 composed of the three-layer deposits 40T, 40S, and 40F obtained in this way, a portion (a portion corresponding to the breathable member 53) 46a in which the absorbent material 45 is deposited on the breathable member 53 is formed.
- the deposit amount of the absorbent material 45 is relatively small, and the other portion (corresponding to the region 54) 46b has a relatively large deposit amount of the absorbent material 45, and the deposit 46 as a whole has an uneven structure. To have.
- the deposit 46 in the drum concave portion 51 is sucked to the mesh belt 75 by the suction from the vacuum box 65. It becomes.
- the deposit 46 in the drum recess 51 is conveyed to a position immediately before the closest portion between the transfer roll 70 and the rotary drum 50, and is sucked from the transfer roll 70 side in the vicinity of the closest portion to the mesh belt.
- the mold is released from the drum recess 51 while being sucked by 75 and moved onto the transfer roll 70.
- the deposit 46 having the concavo-convex structure transferred onto the transfer roll 70 together with the mesh belt 75 is adsorbed to the mesh belt 75 on the transfer roll 70 while being transferred to the vacuum conveyor 80 (the lowermost end of the transfer roll 70). And is transferred to the vacuum conveyor 80 by suction by the vacuum box 84 at the delivery section.
- the intermediate sheet 5 made of tissue paper or hydrophilic nonwoven fabric is introduced onto the vacuum conveyor 80 before the deposit 46 is placed.
- the deposit 46 moves on the intermediate sheet 5. Further, after the intermediate sheet 5 is folded by a folded plate (not shown) and the deposit 46 is wrapped with the intermediate sheet 5, the deposit 46 in a state wrapped with the intermediate sheet 5 is cut at a predetermined interval.
- the absorber precursor 49 cut to the size of one absorber 4A is continuously manufactured.
- the absorber precursor 49 obtained in this way is compressed by the pressurizing means 90, and the thickness of the deposit 46 which comprises the absorber precursor 49 is actively reduced.
- the intended absorber 4A (absorber 4) is obtained.
- the pressurizing means 90 includes a pair of rolls 91 and 92 with smooth surfaces, and can pressurize an object to be pressed introduced between the rolls 91 and 92 from the upper and lower surfaces to compress in the thickness direction. It is configured.
- the portion is compressed more strongly than the portion 46a having a small thickness (corresponding to the breathable member 53).
- the portion (region 54 corresponding portion) 46b (convex portion) and the portion (region 55 corresponding portion) 46c in the deposit 46 are formed.
- the convex portions 43 and the outer peripheral region 402 have a relatively high density, and the portion (corresponding portion of the breathable member 53) 46 a (concave portion) in the deposit 46 has a relatively low density in the absorbent body 4.
- a recess 44 is formed.
- any sheet can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers.
- a liquid-permeable nonwoven fabric, an apertured film, or a laminate of these can be used as the top sheet 2
- a resin film or a laminate of a resin film and a nonwoven fabric can be used as the back sheet 3.
- a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used as the three-dimensional gather forming sheet 62.
- the fastening tape 7 can be used without particular limitation as long as it is usually used for absorbent articles such as disposable diapers.
- male members in “Magic Tape (registered trademark)” manufactured by Kuraray Co., Ltd.
- “Quicklon (registered trademark)” manufactured by YKK
- “Majikurosu (registered trademark)” manufactured by Kanebo Bell Touch
- a hydrophilic sheet for example, a core-wrap sheet made of a water-permeable thin paper (tissue paper) or a water-permeable nonwoven fabric
- a hydrophilic sheet for example, a core-wrap sheet made of a water-permeable thin paper (tissue paper) or a water-permeable nonwoven fabric
- the elastic member 61 for forming a three-dimensional gather, the leg elastic member 63, and the waist elastic member 64 include natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, and ethyl acrylate-ethylene.
- a thread-like stretchable material made of a polyethylene- ⁇ -olefin copolymer or the like can be used.
- the absorbent 4 ⁇ / b> A has a weight ratio of the water-absorbing polymer 41 to the hydrophilic fibers 42 (weight of the water-absorbing polymer 41 / weight of the hydrophilic fibers 42) of 1 or more as shown in FIG. 6. Since it has 2nd area
- the swelling of the water-absorbing polymer 41 in the second region 4S is more likely to occur more positively than the water-absorbing polymer 41 in the first region 4F. Therefore, after absorbing the body fluid, as shown in FIG. 4, the water absorbent polymer 41 swollen on the wall surface of the recess 44 penetrating the second region 4S in the thickness direction overlaps, and the space 9 of the absorber is easily secured. When such a space 9 is secured after the body fluid is absorbed, the body fluid is further diffused outward through the space 9. When the body fluid is sufficiently diffused in this way, the amount of liquid return in the excretory region (near the body fluid absorption point) is small, and the dry feeling is improved.
- the second region 4S is arranged on the non-skin facing surface side of the first region 4F, and the recess 44 is formed from the non-skin facing surface side of the absorbent body 4A.
- the skin facing surface of the absorbent body 4A is formed in the first region 4F.
- the water-absorbing polymer 41 in the first region 4F having a smaller content than the second region 4S swells and gel blocking occurs, and it is easy to prevent body fluid in the space 9 from returning to the skin-facing surface side.
- the amount of liquid return in the vicinity of the body fluid absorption point is further reduced and the dry feeling is further improved.
- the absorber 4A has a third region 4T continuously arranged in the second region 4S.
- the second region 4S has a weight ratio of the water absorbent polymer 41 and the hydrophilic fiber 42 (weight of the water absorbent polymer 41 / weight of the hydrophilic fiber 42) of 1 or more, whereas the second region 4S 4T has less contents of the water-absorbing polymer 41 and the hydrophilic fiber 42 than the second region 4S, and the weight ratio of the water-absorbing polymer 41 and the hydrophilic fiber 42 (weight of the water-absorbing polymer 41 / hydrophilic fiber 42). Weight) is 0.5 or less. Therefore, the third region 4T, which is a hydrophilic fiber-rich layer, acts effectively at the end of the absorbent body in the length direction, and helps to diffuse the body fluid further outward by capillary force.
- the absorber is designed so as to cause gel blocking, and the following four ideas are incorporated.
- It has a passage structure (space 9) that diffuses as much liquid as possible before the water-absorbing polymer 41 causes gel blocking (place a large amount of the water-absorbing polymer 41 in the second region 4S having the recess 44).
- the water-absorbing polymer 41 is made larger than the hydrophilic fiber 42 so as not to form a recess (space).
- the second region 4S has a weight ratio of the water absorbent polymer 41 and the hydrophilic fiber 42 (weight of the water absorbent polymer 41 / weight of the hydrophilic fiber 42) of 1 or more.
- the body space 9 is easily secured.
- the water-absorbing polymer 41 to be used has the above-described water absorption amount, the above-described absorption amount under pressure at 2.0 kPa, and the addition at 2.0 kPa.
- the reduction liquid passing speed is as slow as less than 1 ml / min. Accordingly, as described above, after the body fluid is absorbed, gel blocking is likely to occur in the first region 4F, the amount of liquid return in the excretory region is further reduced, and the dry feeling is further improved.
- the water absorbent polymer 41 to be used is designed to have the above-mentioned DW absorption rate in particular, so the absorption rate of the water absorbent polymer 41 at the initial stage of body fluid absorption is Since it is slow, the occurrence of gel blocking in the first region 4F can be delayed, the gel blocking in the first region 4F occurs in the later stage of body fluid absorption, the amount of liquid return in the excretory region is further reduced, and dry The feeling is further improved.
- the absorbent body 4A can easily diffuse the body fluid after absorbing the body fluid, and can easily reduce the amount of liquid return in the excretion region (in the vicinity of the body fluid absorption point). Therefore, the disposable diaper using the absorbent body 4A 1 improves the feeling of dryness after absorbing bodily fluids and improves comfort during use.
- the disposable diaper 1 using the absorbent body 4A has an intermediate sheet 5 disposed between the absorbent body 4A and the back sheet 3, and a recess 44 (44X, 44Y of the absorbent body 4A). ) And the intermediate sheet 5 form a space 9.
- the intermediate sheet 5 is hydrophilic, the body fluid in the space 9 secured by using gel blocking is easily diffused further outward through the intermediate sheet 5 after absorbing the body fluid. , Improve comfort during use.
- the diaper 1 using the absorbent body 4A is excellent in body shape compatibility even when walking or sitting while maintaining softness due to the formation of the recess 44.
- an absorbent body 4B as a second embodiment of the absorbent body of the present invention will be described based on FIGS.
- a different point from 4 A of absorbers of 1st Embodiment is demonstrated.
- the points that are not particularly described are the same as those of the absorber 4A, and the description of the absorber 4A is appropriately applied.
- the absorber 4 ⁇ / b> B has a first region 4 ⁇ / b> F and a second region 4 ⁇ / b> S as well as the absorber 4, and further includes a third region 4 ⁇ / b> T.
- the second region 4S is disposed on the skin facing surface side of the first region 4F
- the third region 4T is disposed on the skin facing surface side of the second region 4S.
- the third region 4T, the second region 4S, and the first region 4F are continuously arranged in the thickness direction (T direction) and are integrally formed.
- the absorbent body 4 ⁇ / b> B has a concave portion 44 in the thickness direction (in the thickness direction (in the state before the 0.9 wt% sodium chloride aqueous solution (saline solution) is supplied) ( Penetrates in the T direction).
- the absorbent body 4 ⁇ / b> B does not have the outer peripheral region 402, but has only a block-shaped region 401 including a plurality of concave portions 44 and convex portions 43 other than the plurality of concave portions 44. .
- the absorbent body 4 ⁇ / b> B has a convex portion 43 constituting the block-shaped region 401, which protrudes from the non-skin-facing surface side of the absorbent body 4 ⁇ / b> B to the skin-facing surface side.
- the recessed part 44 to dent is dented from the skin opposing surface side of the absorber 4B to the non-skin opposing surface side. Therefore, the skin facing surface side of the absorber 4B has an uneven structure, and the non-skin facing surface side of the absorber 4B is flat.
- the recesses 44 of the absorber 4B form a plurality of rows 44B that extend in the longitudinal direction (Y direction) and are arranged at regular intervals in the longitudinal direction (Y direction).
- a plurality of the rows 44B are arranged in the horizontal direction (X direction).
- the absorbent body 4 ⁇ / b> B has a recess 44 in one row 44 ⁇ / b> B and a recess 44 in another row 44 ⁇ / b> B adjacent to the recess 44 in the lateral direction (X direction).
- one or more and five or less rows 44B including the plurality of recesses 44 are arranged in the block-shaped region 401.
- three rows are arranged in the absorber 4B.
- the number of recesses 44 forming the row 44B is preferably 1 or more and 10 or less per row 44B, for example, 3 in the absorber 4B.
- the distance L5 (see FIG. 10) between the rows 44B adjacent in the lateral direction (X direction) is preferably 5 mm or more and 50 mm or less when the absorbent article is used in a disposable diaper, for example.
- each recess 44 preferably has a lateral direction (X direction) length L6 of 1 mm or more and 25 mm or less, and its longitudinal direction (Y direction). It is preferable that length L7 is 15 mm or more and 500 mm or less.
- the recess 44 of the absorber 4B is formed in a rectangular shape that is long in the vertical direction (Y direction) in plan view, but the corners may be arcuate and polygonal. , An ellipse, or a combination thereof.
- the basic weight, density, etc. of the convex part 43 and the recessed part 44 in the absorber 4B it is the same as the basic weight, density, etc. of the convex part 43 in the absorber 4A.
- the concave portion 44 of the absorbent body 4B is recessed from the top sheet 2 side to the back sheet 3 side.
- the effect at the time of using the absorber 4B of 2nd Embodiment of this invention mentioned above is demonstrated.
- About the effect of the absorber 4B a different point from the effect of the absorber 4A is demonstrated.
- the points that are not particularly described are the same as the effects of the absorber 4A, and the description of the effects of the absorber 4A is appropriately applied.
- the material for forming the absorber 4B is the same as the material for forming the absorber 4A.
- the diaper 1 using the absorbent body 4B has no unevenness on the skin side surface and has a little uncomfortable feeling. Moreover, the shape retention property after body fluid absorption is excellent, and the crotch at the time of mounting
- the absorber of the present invention is not limited to the absorber 4A of the first embodiment and the absorber 4B of the second embodiment, and can be changed as appropriate. Moreover, each component in the above-mentioned absorber 4A and absorber 4B can be implemented in combination as appropriate without departing from the spirit of the present invention.
- the second region 4S is disposed in the thickness direction in a state before the sodium chloride aqueous solution (physiological saline) is supplied.
- the concave portion 44 penetrating in the (T direction) is formed, the concave portion 44 may not be formed. That is, a recess 44 that penetrates the second region 4S in the thickness direction (T direction) is formed in a state in which a 0.9 wt% sodium chloride aqueous solution (saline) is supplied at 2000 g / m 2 and 5 minutes have passed. It only has to be done.
- the second region 4S has the third region 4T on the skin facing surface or the non-skin facing surface, but has the third region 4T. It does not have to be.
- the intermediate sheet 5 is a so-called core wrap sheet that wraps the absorbent bodies 4A and 4B.
- the intermediate sheet 5 is provided between the top sheet 2 and the absorbent bodies 4A and 4B so as to cover the skin facing surfaces of the absorbent bodies 4A and 4B. It may be a hydrophilic so-called sub-layer sheet disposed on the substrate.
- the absorbent article using the absorbent body 4A and the absorbent body 4B of the above-described embodiment is a deployable disposable diaper, but may be a pants-type disposable diaper, a sanitary napkin, an incontinence pad, a panty liner Etc.
- the following absorber and absorbent article are further disclosed regarding the embodiment mentioned above.
- An absorbent body comprising a water-absorbing polymer and hydrophilic fibers, A first region in which a weight ratio of the water-absorbing polymer to the hydrophilic fiber (weight of the water-absorbing polymer / weight of the hydrophilic fiber) is 1 or more; A second region having a higher content of each of the water-absorbing polymer and the hydrophilic fiber than the first region, The first region and the second region are continuously arranged in the thickness direction, An absorbent body in which a concave portion penetrating through the second region in the thickness direction is formed after a lapse of 5 minutes after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 .
- the absorbent body according to ⁇ 1> wherein a concave portion penetrating the second region in the thickness direction is formed in a state before the sodium chloride aqueous solution is supplied.
- the absorbent body has the concave portion and a convex portion partitioned by the concave portion, and the basis weight and density of the absorbent material in the concave portion are the same as the basis weight and density of the absorbent material in the convex portion or the like.
- the absorber according to ⁇ 1> or ⁇ 2> which is lower than the above.
- each of the water-absorbing polymer and the hydrophilic fiber is less than that in the second region, and the weight ratio of the water-absorbing polymer to the hydrophilic fiber (weight of the water-absorbing polymer / weight of the hydrophilic fiber) is 0.5 or less.
- the first region, the second region, and the third region are continuously arranged in the thickness direction, and the recess penetrates the second region and the third region in the thickness direction.
- the absorbent material according to any one of 1> to ⁇ 3>.
- the second region is any one of ⁇ 1> to ⁇ 4>, wherein the weight ratio of the water absorbent polymer to the hydrophilic fiber (weight of the water absorbent polymer / weight of the hydrophilic fiber) is 1 or more.
- Absorber ⁇ 6> The absorbent according to any one of ⁇ 1> to ⁇ 5>, wherein the recess has a depth of 20% to 100% of the thickness of the absorber before absorption.
- ⁇ 7> The absorbent according to any one of ⁇ 3> to ⁇ 6>, wherein the concave portion has a basis weight of 0% to 80% of the convex portion.
- the absorber according to any one of ⁇ 1> to ⁇ 7>, wherein the absorber has a thickness of 0.5 mm to 20 mm before liquid absorption.
- the water-absorbing polymer has a water absorption amount of 30 g / g or more and 50 g / g or less, an absorption amount under pressure at 2.0 kPa of 20 g / g or more and 40 g / g or less, and a pressure reduction under 2.0 kPa.
- the water-absorbing polymer has a water absorption amount of 30 g / g or more and 50 g / g or less, an absorption amount under pressure at 2.0 kPa of 20 g / g or more and 40 g / g or less, and a pressure reduction under 2.0 kPa.
- ⁇ 11> The water-absorbing polymer according to any one of ⁇ 1> to ⁇ 10>, wherein the absorption rate measured according to the DW method is 5 ml / (g ⁇ 1 minute) to 13 ml / (g ⁇ 1 minute). Absorber.
- ⁇ 12> The water-absorbing polymer according to any one of ⁇ 1> to ⁇ 11>, wherein the absorption rate measured according to the DW method is 8 ml / (g ⁇ 1 minute) or more and 13 ml / (g ⁇ 1 minute) or less.
- Absorber. ⁇ 13> The ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the first region (second region / first region) is preferably 1.6 times or more, more preferably 2.0.
- the ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the first region (second region / first region) is preferably 2.5 times or less, more preferably 2.3.
- the difference in the basis weight of the water-absorbing polymer in the second region to the basis weight of the water-absorbing polymer in the first region (second region-first region) is preferably 45 g / cm 2 or more, more preferably 70 g / cm 2.
- the absorber according to any one of ⁇ 1> to ⁇ 14> which is 2 or more, more preferably 90 g / cm 2 or more.
- the ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the first region (second region-first region) is preferably 150 g / cm 2 or less, more preferably 120 g / cm 2.
- the ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the third region (second region / third region) is preferably 15 times or more, more preferably 17 times or more.
- the ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the third region (second region / third region) is preferably 20 times or less, more preferably 19 times or less.
- the difference in the basis weight of the water-absorbing polymer in the second region with respect to the basis weight of the water-absorbing polymer in the third region (second region-third region) is preferably 150 g / cm 2 or more, more preferably 160 g / cm.
- the ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the third region (second region-third region) is preferably 200 g / cm 2 or less, more preferably 180 g / cm 2.
- the ratio of the basis weight of the hydrophilic fibers in the second region to the basis weight of the hydrophilic fibers in the third region (second region / third region) is preferably 1.4 times or more ⁇ 1> to ⁇ 20>
- the ratio of the basis weight of the hydrophilic fibers in the second region to the basis weight of the hydrophilic fibers in the third region (second region / third region) is preferably 1.6 times or less ⁇ 1> to ⁇ 21>
- the difference in the basis weight of the hydrophilic fibers in the second region relative to the basis weight of the hydrophilic fibers in the third region (second region-third region) is preferably 25 g / cm 2 or more ⁇ 1> to ⁇ 22>.
- the ratio of the basis weight of the hydrophilic fibers in the second region to the basis weight of the hydrophilic fibers in the third region (second region-third region) is preferably 35 g / cm 2 or less ⁇ 1> to ⁇
- ⁇ 25> The top sheet disposed on the skin facing surface side, the back sheet disposed on the non-skin facing surface side, and the absorption according to any one of the above ⁇ 1> to ⁇ 24> disposed between the both sheets
- An absorbent article comprising a body.
- the second region is arranged on the skin facing surface side of the first region, The absorbent article according to ⁇ 25>, wherein the recess is recessed from the top sheet side to the back sheet side.
- ⁇ 27> The second region is arranged on the non-skin facing surface side of the first region, The absorbent article according to ⁇ 25>, wherein the recess is recessed from the back sheet side to the top sheet side.
- ⁇ 28> The absorbent article according to any one of ⁇ 25> to ⁇ 27>, wherein a hydrophilic intermediate sheet is disposed between the absorbent body and the top sheet.
- ⁇ 29> The absorbent article according to any one of ⁇ 25> to ⁇ 28>, wherein a hydrophilic intermediate sheet is disposed between the absorbent body and the back sheet.
- ⁇ 30> The absorbent article according to ⁇ 28> or ⁇ 29>, in which a space is formed by the concave portion of the absorbent body and the intermediate sheet.
- an initiator (B) aqueous solution 0.57 g of sodium persulfate manufactured by Wako Pure Chemical Industries, Ltd. was dissolved in 10 g of ion-exchanged water to prepare an initiator (B) aqueous solution. Further, a titanium citrate aqueous solution (citric acid / Ti molar ratio 2.0, Ti amount 0.015% with respect to acrylic acid) was prepared. Monomer A was prepared by adding initiator (A) aqueous solution to monomer aqueous solution A, and monomer B was prepared by adding initiator (A) aqueous solution and titanium citrate aqueous solution 2.4 g to monomer aqueous solution B.
- the monomer A and the monomer B were dropped in order over about 60 minutes using a microtube pump from the monomer dropping port.
- azeotropic dehydration was performed to adjust the water content of the water-absorbing polymer (hydrogel) to 60%, and ethylene glycol diglycidyl ether (trade name Denacol EX-810) manufactured by Nagase Chemical Industries Co., Ltd. .16 g dissolved in 10 g water was added. Thereafter, azeotropic dehydration was further performed, and the water content of the hydrogel was adjusted to 50% over about 1.5 hours.
- a quaternary ammonium salt (trade name Cotamine 86W) manufactured by Kao Corporation was added after diluting with water. After cooling, cyclohexane was removed and dried under reduced pressure to obtain a water-absorbing polymer. Coarse particles were removed with a 850 micron sieve. 5.0 g of the polymer particles obtained, 12 pieces of 10 mm zirconia beads were placed in a 50 mL screw tube, the lid was closed, and placed on a table-type bead mill (type V-1) manufactured by Irie Shokai Co., Ltd. and subjected to a bead mill treatment for 10 minutes.
- a table-type bead mill type V-1 manufactured by Irie Shokai Co., Ltd.
- the water-absorbing polymer is obtained by dry blending 0.5 part of Aerosil 200 manufactured by Nippon Aerosil Co., Ltd. with respect to 100 parts of the particles, and the water-absorbing polymer having a large particle diameter is removed by sieving. Polymer A was obtained.
- the physical properties of the water-absorbing polymer A thus obtained were as follows: its water absorption was 38 g / g, its absorption under pressure at 2.0 kPa was 24 g / g, and its flow rate under pressure at 2.0 kPa was 0 ml.
- the late absorption rate after 10 minutes was 46 ml / (g ⁇ 10 minutes), and the initial absorption rate after 1 minute was 11 ml / (g ⁇ 1 minutes).
- the water absorption amount of the water-absorbing polymer, the absorption amount under pressure, the liquid passing rate under pressure, and the absorption rate after 10 minutes and 1 minute were measured by the measurement method described above.
- Monomer A is prepared by adding 7.2 g of initiator (A) aqueous solution to monomer aqueous solution A
- monomer B is prepared by adding 7.2 g of initiator (A) aqueous solution and 1.5 g of titanium citrate aqueous solution to monomer aqueous solution B.
- 10.5 g of the initiator (B) aqueous solution and 3 g of the titanium citrate aqueous solution were added to the monomer aqueous solution C to prepare monomer C.
- the monomer A, the monomer B, and the monomer C that had been allowed to stand for 5 minutes or more from the monomer dropping port were sequentially applied over about 60 minutes.
- the solution was dropped and polymerized.
- azeotropic dehydration is performed using a dehydrating tube, the water content of the water-absorbing polymer (hydrogel) is adjusted to 60%, and ethylene glycol diglycidyl ether (trade name) manufactured by Nagase Chemical Industries, Ltd. is used as a crosslinking agent. Denacol EX-810) 0.20 g dissolved in 10 g of water was added. Thereafter, azeotropic dehydration was further performed, and the water content of the hydrogel was adjusted to 40% over about 1.5 hours. To this hydrogel, a quaternary ammonium salt (trade name: Cotamin 86W) manufactured by Kao Corporation.
- 1% (based on the solid content of the hydrogel) was diluted with water and added. After cooling, cyclohexane was removed and dried under reduced pressure to obtain a water-absorbing polymer. Coarse particles were removed with a 850 micron sieve. 5.0 g of the polymer particles obtained, 12 pieces of 10 mm zirconia beads were placed in a 50 mL screw tube, the lid was closed, and placed on a table-type bead mill (type V-1) manufactured by Irie Shokai Co., Ltd. and subjected to a bead mill treatment for 10 minutes. This operation was repeated four times to obtain a total of 20 g of particles.
- a table-type bead mill (type V-1) manufactured by Irie Shokai Co., Ltd.
- the water-absorbing polymer is obtained by dry blending 0.5 part of Aerosil 200 manufactured by Nippon Aerosil Co., Ltd. with respect to 100 parts of the particles, and the water-absorbing polymer having a large particle diameter is removed by sieving. Polymer B was obtained.
- the physical properties of the obtained water-absorbing polymer B are as follows: the water absorption is 39 g / g, the absorption under pressure at 2.0 kPa is 20 g / g, and the liquid passing rate under pressure at 2.0 kPa is 0. 0.3 ml / min, the late absorption rate after 10 minutes was 48 ml / (g ⁇ 10 minutes), and the initial absorption rate after 1 minute was 16 ml / (g ⁇ 1 minutes).
- the water absorption amount of the water-absorbing polymer, the absorption amount under pressure, the liquid passing rate under pressure, and the absorption rate after 10 minutes and 1 minute were measured by the measurement method described above.
- a water-absorbing polymer was obtained in the same manner as described above except that the water-absorbing polymer having a large particle size was removed by sieving to obtain a water-absorbing polymer C having an average particle size of 360 ⁇ m.
- the properties of the water-absorbing polymer C obtained were as follows: the water absorption was 35 g / g, the absorption under pressure at 2.0 kPa was 24 g / g, and the liquid flow rate under pressure at 2.0 kPa was 17 ml. / Min, the late absorption rate after 10 minutes was 51 ml / (g ⁇ 10 minutes), and the initial absorption rate after 1 minute was 20 ml / (g ⁇ 1 minutes).
- the water absorption amount of the water-absorbing polymer, the absorption amount under pressure, the liquid passing rate under pressure, and the absorption rate after 10 minutes and 1 minute were measured by the measurement method described above.
- Example 1 The absorber shown in FIG. 5 and FIG. 6 was produced using the apparatus shown in FIG. In addition, the produced absorber is an absorber which does not have a 3rd area
- the weight (basis weight) of the water-absorbing polymer is 80 g / m 2 and the weight (basis weight) of the hydrophilic fiber is 50 g / m 2 in a dry state.
- the ratio by weight of the hydrophilic fiber was 1.6.
- the second region 4S of the absorbent body is in a dry state
- the weight (basis weight) of the water-absorbing polymer is 180 g / m 2
- the weight (basis weight) of the hydrophilic fiber is 150 g / m 2
- the weight ratio of the water-soluble polymer to the hydrophilic fiber was 1.2.
- the absorber had a total length of 385 mm and a total width of 125 mm before liquid absorption. Further, the block-shaped region of the absorber had a length in the vertical direction (Y direction) of 375 mm and a total width in the horizontal direction (X direction) of 105 mm before liquid absorption. And the outer peripheral area
- the width L1 of the recess 44X extending in the horizontal direction (X direction) constituting the block-shaped region is 5 mm
- the width L2 of the recess 44Y extending in the vertical direction (Y direction) is 5 mm
- the length L3 in the vertical direction (Y direction) of the convex portion 43 constituting the shape region was 40 mm
- the length L4 in the horizontal direction (X direction) of the convex portion 43 was 15 mm.
- the basic weight of the recessed part 44 (44X, 44Y) was 130 g / m ⁇ 2 > in the dry state
- the basic weight of the convex part 43 was 460 g / m ⁇ 2 >.
- the absorber has a thickness of 5.0 mm
- the recess 44 (44X, 44Y) has a depth of 3.5 mm
- the depth is the thickness of the absorber. 70%.
- the absorbent body has a thickness of 9.5 mm
- the recess 44 ( 44X, 44Y) had a depth of 7.0 mm, and the depth was 74% of the thickness of the absorber.
- the state after liquid absorption was measured with the measuring method shown below.
- the absorber was placed on a flat glass plate placed horizontally. When arranging, the surface of the absorber on the side facing the plate has an uneven structure, and the surface of the absorber on the non-opposing side is flat. Then, from the upper surface of the flat absorbent body, a 0.9 wt% sodium chloride aqueous solution was supplied at 2000 g / m 2 using a burette. And the absorber after 5 minutes passed was cut
- the thickness of the absorber is a value measured at the thickest position, and the thickness of the recess is a value measured at the thinnest position.
- the measurement was performed by measuring three samples for each absorber, and the average value of the measured values was obtained and shown in Table 1.
- Example 2 The absorbent body of Example 2 was produced in the same manner as in Example 1 except that the water absorbent polymer B was used as the water absorbent polymer. In a state before liquid absorption, the absorber has a thickness of 5.0 mm, and the recess 44 (44X, 44Y) has a depth of 3.5 mm, which is 70% of the thickness of the absorber. Met.
- the absorbent body has a thickness of 10.2 mm, and the recess 44 ( 44X, 44Y) had a depth of 7.5 mm, and the depth was 74% of the thickness of the absorber.
- Example 3 The absorbent body of Example 3 was produced in the same manner as in Example 1 except that the water absorbent polymer C was used as the water absorbent polymer. In a state before liquid absorption, the absorber has a thickness of 5.0 mm, and the recess 44 (44X, 44Y) has a depth of 3.5 mm, which is 70% of the thickness of the absorber. Met.
- the absorber in the state after liquid absorption (state after 5 minutes have passed after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 ), the absorber has a thickness of 9.1 mm and has a recess 44 ( 44X, 44Y) had a depth of 6.7 mm, and the depth was 74% of the thickness of the absorber.
- Example 4 Example 1 except that the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the first region 4F of the absorber and the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the second region 4S of the absorber are changed. Similarly, the absorber of Example 4 was produced.
- the water-absorbing polymer the water-absorbing polymer A was used as in Example 1. Specifically, in the first region 4F of the absorbent body, the weight (basis weight) of the water-absorbing polymer is 110 g / m 2 and the weight (basis weight) of the hydrophilic fiber is 80 g / m 2 in a dry state.
- the weight ratio of the water-absorbing polymer to the hydrophilic fiber was 1.38. Further, the second region 4S of the absorbent body is in a dry state, the weight (basis weight) of the water-absorbing polymer is 140 g / m 2 , the weight (basis weight) of the hydrophilic fiber is 120 g / m 2 , The weight ratio of the water-soluble polymer to the hydrophilic fiber (weight of the water-absorbing polymer / weight of the hydrophilic fiber) was 1.17.
- the absorber in the state before liquid absorption, has a thickness of 4.5 mm, and the recess 44 (44X, 44Y) has a depth of 2.3 mm, and this depth is the thickness of the absorber. 51%. Further, in the state after liquid absorption (state after 5 minutes have passed after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 ), the absorber has a thickness of 8.8 mm, and has a recess 44 ( 44X, 44Y) had a depth of 5.0 mm, which was 57% of the thickness of the absorber.
- Example 5 Example 1 except that the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the first region 4F of the absorber and the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the second region 4S of the absorber are changed. Similarly, the absorber of Example 5 was produced.
- the water-absorbing polymer the water-absorbing polymer A was used as in Example 1. Specifically, in the first region 4F of the absorbent body, the weight (basis weight) of the water-absorbing polymer is 110 g / m 2 and the weight (basis weight) of the hydrophilic fiber is 80 g / m 2 in a dry state.
- the weight ratio of the water-absorbing polymer to the hydrophilic fiber was 1.38. Further, the second region 4S of the absorbent body is in a dry state, the weight (basis weight) of the water-absorbing polymer is 140 g / m 2 , the weight (basis weight) of the hydrophilic fiber is 120 g / m 2 , The weight ratio of the water-soluble polymer to the hydrophilic fiber (weight of the water-absorbing polymer / weight of the hydrophilic fiber) was 1.17.
- the absorber in the state before liquid absorption, has a thickness of 3.0 mm, and the recess 44 (44X, 44Y) has a depth of 0.5 mm, which is the thickness of the absorber. 17%. Further, in the state after liquid absorption (state after 5 minutes have passed after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 ), the absorber has a thickness of 8.8 mm, and has a recess 44 ( 44X, 44Y) had a depth of 5.0 mm, which was 57% of the thickness of the absorber.
- Example 6 The absorbent body of Example 6 is manufactured in the same manner as in Example 1 except that the third area is included and the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the second area 4S of the absorbent body is changed. did.
- the water-absorbing polymer the water-absorbing polymer A was used as in Example 1.
- the second region 4S of the absorbent body is in a dry state, and the weight (basis weight) of the water-absorbing polymer is 170 g / m 2 , and the weight (basis weight) of the hydrophilic fiber is 90 g / m 2 .
- the weight ratio of the water-absorbing polymer to the hydrophilic fiber was 1.89.
- the third region 4T of the absorbent body is in a dry state, and the weight (basis weight) of the water-absorbing polymer is 10 g / m 2 and the weight (basis weight) of the hydrophilic fiber is 60 g / m 2.
- the weight ratio of the water-soluble polymer to the hydrophilic fiber was 0.17.
- the absorber In the state before liquid absorption, the absorber has a thickness of 5.2 mm, and the recess 44 (44X, 44Y) has a depth of 3.7 mm, which is the thickness of the absorber. It was 71%. Further, in the state after liquid absorption (state in which a 0.9 wt% sodium chloride aqueous solution is supplied at 2000 g / m 2 and after 5 minutes have elapsed), the absorber has a thickness of 9.2 mm and has a recess 44 ( 44X, 44Y) had a depth of 6.7 mm, and the depth was 73% of the thickness of the absorber.
- Example 7 The absorber shown in FIG. 10, FIG. 11 was produced using the apparatus shown in FIG. In addition, the produced absorber is an absorber which does not have a 3rd area
- the ratio by weight of the hydrophilic fiber to the hydrophilic fiber was 1.25. Further, the second region 4S of the absorbent body is in a dry state, the weight (basis weight) of the water-absorbing polymer is 200 g / m 2 , the weight (basis weight) of the hydrophilic fiber is 150 g / m 2 , The weight ratio of water-soluble polymer to hydrophilic fiber (weight of water-absorbing polymer / weight of hydrophilic fiber) was 1.3.
- the absorber (block-shaped region) had a total length of 380 mm and a total width of 120 mm before liquid absorption.
- the row 44B composed of the plurality of concave portions 44 has an interval L5 between the rows 44B adjacent in the horizontal direction (X direction) of 20 mm, and between the rows 44B adjacent in the vertical direction (Y direction).
- the distance L8 was 30 mm.
- each recess 44 had a length L6 in the horizontal direction (X direction) of 20 mm and a length L7 in the vertical direction (Y direction) of 100 mm.
- the basic weight of the recessed part 44 (44X, 44Y) was 180 g / m ⁇ 2 > in the dry state, and the basic weight of the convex part 43 was 530 g / m ⁇ 2 >. Further, in the state before liquid absorption, the absorber has a thickness of 5.5 mm, and the recess 44 (44X, 44Y) has a depth of 3.2 mm, which is the thickness of the absorber. 58%.
- the absorber in the state after liquid absorption (state after 5 minutes have passed after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 ), the absorber has a thickness of 8.5 mm, and has a recess 44 ( 44X, 44Y) had a depth of 5.8 mm, and the depth was 68% of the thickness of the absorber.
- Example 7 with the exception of changing the weight ratio of the water-absorbing polymer and hydrophilic fibers in the first region 4F of the absorber and the weight ratio of the water-absorbing polymer and hydrophilic fibers in the second region 4S of the absorber.
- the absorber of Example 8 was produced.
- the water absorbing polymer the water absorbing polymer A was used as in Example 7. Specifically, the first region 4F of the absorbent body is in a dry state, the weight (basis weight) of the water-absorbing polymer is 125 g / m 2 , and the weight (basis weight) of the hydrophilic fiber is 100 g / m 2 .
- the weight ratio of the water-absorbing polymer to the hydrophilic fiber was 1.25. Further, the second region 4S of the absorbent body is in a dry state, the weight (basis weight) of the water-absorbing polymer is 160 g / m 2 , the weight (basis weight) of the hydrophilic fiber is 125 g / m 2 , The weight ratio of the water-soluble polymer to the hydrophilic fiber (the weight of the water-absorbing polymer / the weight of the hydrophilic fiber) was 1.28.
- the absorber In a state before liquid absorption, the absorber has a thickness of 3.5 mm, and the recess 44 (44X, 44Y) has a depth of 0.5 mm, which is 14% of the thickness of the absorber. Met. Moreover, in the state after liquid absorption (state after supply of 2,000 g / m 2 of 0.9% by weight sodium chloride aqueous solution for 5 minutes), the absorber has a thickness of 7.8 mm, and the recess 44 ( 44X, 44Y) had a depth of 4.5 mm, which was 58% of the thickness of the absorber.
- Example 9 The absorbent body of Example 9 is manufactured in the same manner as in Example 7, except that the third area is included and the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the second area 4S of the absorbent body is changed. did.
- the water absorbing polymer the water absorbing polymer A was used as in Example 7.
- the weight (basis weight) of the water-absorbing polymer is 190 g / m 2 and the weight (basis weight) of the hydrophilic fiber is 90 g / m 2 in a dry state.
- the weight ratio of the water-absorbing polymer to the hydrophilic fiber was 2.11.
- the third region 4T of the absorbent body is in a dry state, and the weight (basis weight) of the water-absorbing polymer is 10 g / m 2 and the weight (basis weight) of the hydrophilic fiber is 60 g / m 2.
- the weight ratio of the water-soluble polymer to the hydrophilic fiber was 0.17.
- the absorber has a thickness of 5.5 mm, and the recess 44 (44X, 44Y) has a depth of 3.2 mm, which is the thickness of the absorber. 58%.
- the absorber in the state after liquid absorption (state after supply of 0.9 g% sodium chloride aqueous solution of 2000 g / m 2 for 5 minutes), the absorber has a thickness of 8.3 mm, and the recess 44 ( 44X, 44Y) had a depth of 5.6 mm, and the depth was 67% of the thickness of the absorber.
- Example 1 Example 1 except that the weight ratio between the water-absorbing polymer and the hydrophilic fiber in the first region 4F of the absorber and the weight ratio between the water-absorbing polymer and the hydrophilic fiber in the second region 4S of the absorber are changed. Similarly, the absorbent body of Comparative Example 1 was produced.
- the water-absorbing polymer the water-absorbing polymer A was used as in Example 1. Specifically, in the first region 4F of the absorber, the weight (basis weight) of the water-absorbing polymer is 150 g / m 2 and the weight (basis weight) of the hydrophilic fiber is 50 g / m 2 in a dry state.
- the weight ratio of the water-absorbing polymer to the hydrophilic fiber was 3.0.
- the second region 4S of the absorbent body is in a dry state
- the weight (basis weight) of the water-absorbing polymer is 80 g / m 2
- the weight (basis weight) of the hydrophilic fiber is 150 g / m 2
- the weight ratio of the hydrophilic polymer to the hydrophilic fiber was 0.53.
- the absorber In the state before liquid absorption, the absorber had a thickness of 4.2 mm, and the recess had a depth of 2.0 mm, and the depth was 48% of the thickness of the absorber. Further, in the state after liquid absorption (state after 5 minutes have passed after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 ), the absorber has a thickness of 8.5 mm, The depth was 1.5 mm, and the depth was 18% of the thickness of the absorber. The concave portion did not penetrate the second region.
- Comparative Example 2 By changing the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the first region 4F of the absorber and the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the second region 4S of the absorber, the thickness and the concave portion of the absorber are changed.
- the absorbent body of Comparative Example 2 was produced in the same manner as in Example 1 except that the depth of was changed.
- the water-absorbing polymer the water-absorbing polymer A was used as in Example 1. Specifically, in the first region 4F of the absorber, the weight (basis weight) of the water-absorbing polymer is 80 g / m 2 and the weight (basis weight) of the hydrophilic fiber is 50 g / m 2 in a dry state.
- the weight ratio of the water-absorbing polymer to the hydrophilic fiber was 1.6. Further, the second region 4S of the absorbent body is in a dry state, the weight (basis weight) of the water-absorbing polymer is 120 g / m 2 , the weight (basis weight) of the hydrophilic fibers is 100 g / m 2 , The weight ratio of the water-soluble polymer to the hydrophilic fiber (weight of the water-absorbing polymer / weight of the hydrophilic fiber) was 1.2.
- the absorber In the state before liquid absorption, the absorber had a thickness of 3.5 mm, and the recess had a depth of 0.5 mm, and the depth was 14% of the thickness of the absorber. Further, in the state after liquid absorption (state after supply of 2,000 g / m 2 of 0.9 wt% sodium chloride aqueous solution for 5 minutes), the absorber has a thickness of 7.0 mm, The depth was 1.0 mm, and the depth was 14% of the thickness of the absorber. The concave portion did not penetrate the second region.
- Example 7 with the exception of changing the weight ratio of the water-absorbing polymer and hydrophilic fibers in the first region 4F of the absorber and the weight ratio of the water-absorbing polymer and hydrophilic fibers in the second region 4S of the absorber. Similarly, an absorbent body of Comparative Example 3 was produced. As the water absorbing polymer, the water absorbing polymer A was used as in Example 7. Specifically, in the first region 4F of the absorbent body, in a dry state, the weight (basis weight) of the water-absorbing polymer is 160 g / m 2 , and the weight (basis weight) of the hydrophilic fiber is 80 g / m 2 .
- the weight ratio of the water-absorbing polymer to the hydrophilic fiber was 2.0. Further, the second region 4S of the absorbent body is in a dry state, the weight (basis weight) of the water-absorbing polymer is 100 g / m 2 , the weight (basis weight) of the hydrophilic fibers is 150 g / m 2 , The weight ratio of the water-soluble polymer to the hydrophilic fiber (the weight of the water-absorbing polymer / the weight of the hydrophilic fiber) was 0.67.
- the absorber had a thickness of 5.5 mm, and the recess had a depth of 2.2 mm, and the depth was 40% of the thickness of the absorber.
- the absorbent body has a thickness of 7.2 mm, The depth was 1.4 mm, and the depth was 19% of the thickness of the absorber. The concave portion did not penetrate the second region.
- Liquid return amount (g) weight of filter paper after pressurization (W2) ⁇ weight of first filter paper (W1)
- the absorbent articles having the absorbers of Examples 1 to 9 have better liquid diffusibility than the absorbent articles having the absorbers of Comparative Examples 1 to 3. there were. Furthermore, the absorbent articles provided with the absorbers of Examples 1 to 9 have a faster absorption time, less liquid return, and better liquid return than the absorbent articles provided with the absorbers of Comparative Examples 1 to 3. Met. Therefore, in the absorbent articles provided with the absorbers of Examples 1 to 9, the dry feeling is improved, and improvement in wearability during wearing can be expected.
- the absorbent body of the present invention it is possible to secure the space of the absorbent body after absorbing the body fluid, the absorption time is fast, and a sufficient liquid diffusion effect can be expected. Further, by actively generating gel blocking of the water-absorbing polymer and utilizing the gel blocking, the amount of liquid return in the excretory region is small, and the dry feeling is improved.
Landscapes
- Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Laminated Bodies (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
本明細書において、「肌対向面」とは、おむつ1を構成する表面シート2などの各部材の表裏両面のうち、着用時に着用者の肌側に配される面であり、「非肌対向面」とは、表面シート2などの各部材の表裏両面のうち、着用時に着用者の肌側とは反対側に向けられる面である。 The diaper 1 will be described in detail. As shown in FIG. 1, the diaper 1 has a ventral portion A in the longitudinal direction (hereinafter also referred to as “Y direction”. Y direction: a direction parallel to the center line CL). , A back side portion B and a crotch portion C positioned between these A and B. The abdomen A is a part located on the wearer's abdomen when the diaper is worn, the dorsal part B is a part located on the wearer's back, and the crotch C is located on the inseam of the wearer. It is a part to do. The crotch part C is located in the central part of the diaper 1 in the vertical direction (Y direction). In addition, the direction orthogonal to the vertical direction (Y direction) will be described as the horizontal direction of the diaper 1 (hereinafter also referred to as “X direction”).
In the present specification, the “skin facing surface” is a surface disposed on the skin side of the wearer when worn, out of the front and back surfaces of each member such as the
第1領域4F及び第2領域4S及び第3領域4Tの坪量の測定方法は以下の通りである。
0.9重量%の塩化ナトリウム水溶液を供給する前の状態(以下、「液吸収前の状態」ともいう。)の吸収体4Aの任意の場所を1cm角にフェザー社製片刃剃刀を用いて切断し、小片10個を得る。切断して得られた小片10個を、後述する方法で定義された断面方向の境界に沿って、フェザー社製片刃剃刀を用いて切断し、第1領域を取り出す。その小片の第1領域から吸水性ポリマーを取り除き、親水性繊維と吸水性ポリマーを分別し、電子天秤(A&D社製電子天秤GR-300、精度:小数点以下4桁)を用いて測定し、親水性繊維と吸水性ポリマーの各重量を求める。片刃剃刀を用いて切断後、目開き2mmの篩を用いて吸水性ポリマーと親水性繊維を分別する。求めた重量を小片1個当りの面積で除して第1領域4Fの吸水性ポリマー及び親水性繊維の坪量を算出する。同様にして、第2領域及び第3領域の吸水性ポリマー及び親水性繊維の坪量を算出する。
ここで、第1領域4Fと第2領域4Sとの境界は、吸収体の製造段階においては、吸水性ポリマー41及び親水性繊維42それぞれの含有量が多くなる部位である。また、吸収体4Aのように、第3領域4Tを有する場合の第2領域4Sと第3領域4Tとの境界は、吸収体の製造段階においては、重量比(吸水性ポリマーの重量/親水性繊維の重量)が0.5以下となる部位である。
既に製造された吸収体(完成品)の境界を明確に定義する場合には、図6に示すように、吸収体の厚み及び凹部の深さを測定し、厚みと深さとの関係により、以下のA~Cの3通りに場合分けして判断する。
A:凹部の深さが吸収体の厚み(凸部の厚み)の30%以上80%以下である場合
図6に示すように前記吸収体を断面視して、隣り合う凹部44それぞれの底部の頂点を結ぶ直線を便宜上第1領域4Fと第2領域4Sとの境界とする。また、吸収体4Aのように、第3領域4Tを有する場合には、図6に示すように吸収体を断面視して、吸収体4Aの厚みを均等に4等分し、それらの中で、最も第1領域4Fから離れた位置にある均等線を便宜上第2領域4Sと第3領域4Tとの境界とする。
B:凹部の深さが吸収体の厚み(凸部の厚み)の80%より大きい場合
図6に示すように前記吸収体を断面視して、吸収体の厚みを均等に4等分し、それらの中で、凹部の窪みが形成された吸収体の面から最も離れた位置にある均等線を便宜上第1領域4Fと第2領域4Sとの境界とする。また、第3領域4Tを有する場合には、吸収体の厚みを均等に4等分し、それらの中で、凹部の窪みが形成された吸収体の面に最も近い位置にある均等線を便宜上第2領域4Sと第3領域4Tとの境界とする。
C:凹部の深さが吸収体の厚み(凸部の厚み)の30%より小さい場合
図6に示すように前記吸収体を断面視して、吸収体の厚みを均等に4等分し、それらの中で、凹部の窪みが形成された吸収体の面から最も近い位置にある均等線を便宜上第1領域4Fと第2領域4Sとの境界とする。また、第3領域4Tを有する場合には、吸収体の厚みを均等に10等分し、それらの中で、凹部の窪みが形成された吸収体の面に最も近い位置にある均等線を便宜上第2領域4Sと第3領域4Tとの境界とする。 <Measurement Method of Basis Weight of
The measuring method of the basic weight of 1st area |
Using a single-edged razor made by Feather on an arbitrary place of the
Here, the boundary between the
When clearly defining the boundary of an already manufactured absorbent body (finished product), as shown in FIG. 6, the thickness of the absorbent body and the depth of the recess are measured, and the relationship between the thickness and the depth is as follows: Judgment is made according to the three cases of A to C.
A: When the depth of the concave portion is 30% or more and 80% or less of the thickness of the absorber (thickness of the convex portion) As shown in FIG. A straight line connecting the vertices is defined as a boundary between the
B: When the depth of the concave portion is greater than 80% of the thickness of the absorber (thickness of the convex portion) As shown in FIG. 6, the absorber is viewed in cross section, and the thickness of the absorber is equally divided into four equal parts, Among these, for the sake of convenience, an equal line located at the position farthest from the surface of the absorbent body in which the recesses are formed is defined as a boundary between the
C: When the depth of the concave portion is smaller than 30% of the thickness of the absorber (thickness of the convex portion) As shown in FIG. 6, the absorber is sectioned, and the thickness of the absorber is equally divided into four equal parts, Among them, the uniform line that is closest to the surface of the absorbent body in which the recesses are formed is used as the boundary between the
乾燥後、吸水性ポリマーと親水性繊維を分別することが非常に困難な場合は、片刃剃刀を用いて切断した直後の乾燥前に、イオン交換水中で吸水性ポリマーと親水性繊維をピンセットやスパーテルなどを用いて分別することができる。その後、乾燥して、それぞれの平均重量を求めることになる。
それぞれの境界を明確に定義する場合には、図4に示すように、0.9重量%の塩化ナトリウム水溶液(生理食塩水)を2000g/m2供給して5分経過後の状態(液吸収後の状態)の吸収体を断面視し、吸収体の厚み及び凹部の深さを測定し、厚みと深さとの関係により、以下のA~Cの3通りに場合分けして判断する。 However, when the boundary cannot be clearly defined by this method or in the case of an already manufactured absorber (finished product), 0.9% by weight sodium chloride aqueous solution is supplied and the cross-sectional direction defined by the method described later is supplied. Cut along the boundary using a feather blade razor and take out the first region, the second region, and the third region. Thereafter, the average weight of the water-absorbing polymer and the hydrophilic fiber is determined in a state where moisture is dried. Here, since the amount of salt after drying is sufficiently small, it can be ignored.
If it is very difficult to separate the water-absorbing polymer and the hydrophilic fiber after drying, the water-absorbing polymer and the hydrophilic fiber are tweezers or spatula in ion-exchanged water before drying immediately after cutting with a single blade razor. And so on. Then, it dries and calculates | requires each average weight.
If clearly define each boundary, as shown in FIG. 4, 0.9 wt% sodium chloride aqueous solution (physiological saline) was 2000 g / m 2 supplied after 5 minutes state (liquid absorbent The absorber in the later state) is viewed in cross section, the thickness of the absorber and the depth of the recess are measured, and judgment is made according to the following three cases A to C depending on the relationship between the thickness and the depth.
図4に示すように生理食塩水供給後の前記吸収体を断面視して、隣り合う後述する凹部44それぞれの底部の頂点を結ぶ直線を便宜上第1領域4Fと第2領域4Sとの境界とする。また、吸収体4Aのように、第3領域4Tを有する場合には、図4に示すように吸収体を断面視して、吸収体4Aの厚みを均等に4等分し、それらの中で、最も第1領域4Fから離れた位置にある均等線を便宜上第2領域4Sと第3領域4Tとの境界とする。
B:凹部の深さが吸収体の厚み(凸部の厚み)の80%より大きい場合
図4に示すように生理食塩水供給後の前記吸収体を断面視して、吸収体の厚みを均等に4等分し、それらの中で、凹部の窪みが形成された吸収体の面から最も近い位置にある均等線を便宜上第1領域4Fと第2領域4Sとの境界とする。また、第3領域4Tを有する場合には、吸収体の厚みを均等に4等分し、それらの中で、凹部の窪みが形成された吸収体の面に最も近い位置にある均等線を便宜上第2領域4Sと第3領域4Tとの境界とする。
C:凹部の深さが吸収体の厚み(凸部の厚み)の30%より小さい場合
図4に示すように生理食塩水供給後の前記吸収体を断面視して、吸収体の厚みを均等に4等分し、それらの中で、凹部の窪みが形成された吸収体の面から最も離れた位置にある均等線を便宜上第1領域4Fと第2領域4Sとの境界とする。また、第3領域4Tを有する場合には、吸収体の厚みを均等に10等分し、それらの中で、凹部の窪みが形成された吸収体の面に最も近い位置にある均等線を便宜上第2領域4Sと第3領域4Tとの境界とする。 A: When the depth of the concave portion is not less than 30% and not more than 80% of the thickness of the absorbent body (thickness of the convex portion) As shown in FIG. For convenience, a straight line connecting the vertices of the bottoms of the
B: When the depth of the concave portion is larger than 80% of the thickness of the absorbent body (thickness of the convex portion) As shown in FIG. For the sake of convenience, an equal line located closest to the surface of the absorber in which the depressions of the recesses are formed is used as a boundary between the
C: When the depth of the concave portion is smaller than 30% of the thickness of the absorbent body (thickness of the convex portion) As shown in FIG. For the sake of convenience, an equal line located farthest from the surface of the absorbent body in which the depressions of the recesses are formed is used as a boundary between the
ブロック形状領域401は、液吸収前の状態で、その縦方向(Y方向)の長さが、吸収体4AのY方向の全長の80%以上100%以下の長さであることが好ましい。
ブロック形状領域401は、液吸収前の状態で、その横方向(X方向)の長さが、吸収体4AのX方向の全幅の60%以上100%以下の長さであることが好ましい。
ブロック形状領域401は、使い捨ておむつに用いられる場合においては、液吸収前の状態で、縦方向(Y方向)の全長が150mm以上600mm以下であり、横方向(X方向)の全幅が20mm以上200mm以下であることが好ましい。
外周領域402は、使い捨ておむつに用いられる場合においては、液吸収前の状態で、縦方向(Y方向)の両端部それぞれの縦方向(Y方向)の長さが、5mm以上50mm以下であることが好ましい。縦方向(Y方向)に沿う両側部それぞれの横方向(X方向)の長さも同じである。 When the
The block-shaped
The block-shaped
When the block-shaped
When the outer
横方向(X方向)に延びる線状の凹部44Xの幅L1(図1参照)は、吸収性物品が例えば使い捨ておむつに用いられる場合においては、吸収体に空間を確保でき、体液の十分な拡散効果と素早い吸収性の観点から、液吸収前の状態で、0.5mm以上20mm以下であることが好ましい。
縦方向(Y方向)に延びる線状の凹部44Yの幅L2(図1参照)は、吸収性物品が例えば使い捨ておむつに用いられる場合においては、吸収体に空間を確保でき、体液の十分な拡散効果と素早い吸収性の観点から、液吸収前の状態で、0.5mm以上20mm以下であることが好ましい。
尚、幅L1,L2は、吸収体4Aの凹凸構造における凹部の底部の位置での測定値である。 Hereinafter, the size, basis weight, and the like of the
The width L1 (see FIG. 1) of the
The width L2 (see FIG. 1) of the
The widths L1 and L2 are measured values at the position of the bottom of the recess in the concavo-convex structure of the
おむつ1の凸部43は、吸収性物品が例えば使い捨ておむつに用いられる場合においては、体液を十分に吸収し、排泄部領域での液戻り量を低減させる観点から、液吸収前の状態で、図1に示すように、その縦方向(Y方向)の長さL3が、15mm以上300mm以下であることが好ましい。また、その横方向(X方向)の長さL4が、液吸収前の状態で、5mm以上50mm以下であることが好ましい。 In the diaper 1, the
In the case where the absorbent article is used for, for example, a disposable diaper, the
具体的には、凹部44(44X,44Y)は、乾燥状態で、その坪量が0g/m2以上400g/m2以下であることが好ましい。また、凸部43は、乾燥状態で、その坪量が200g/m2以上600g/m2以下であることが好ましい。
凸部43及び凹部44の坪量は次のようにして測定される。 When the absorbent article is used for a disposable diaper, for example, the recess 44 (44X, 44Y) can secure a space in the absorbent body and is hydrophilic in a dry state from the viewpoint of a sufficient diffusion effect of body fluid and quick absorbability. It is preferable that the basis weight of the entire absorbent body including the absorbent fiber and the absorbent polymer is not less than 0% and not more than 80% of the basis weight of the
Specifically, the recess 44 (44X, 44Y) is preferably in a dry state and has a basis weight of 0 g / m 2 or more and 400 g / m 2 or less. Further, the
The basis weight of the
凸部43及び凹部44の坪量の測定方法は以下の通りである。
吸収体4における凸部43と凹部44の境界線に沿ってフェザー社製片刃剃刀を用いて切断する。切断して得られた凸部43の小片10個をそれぞれ電子天秤(A&D社製電子天秤GR-300、精度:小数点以下4桁)を用いて測定し、凸部43の小片1個の平均重量を求める。求めた平均重量を凸部43の小片1個当りの平均面積で除して凸部43の坪量を算出する。
次いで、凸部43と凹部44(44Y)の縦方向(Y方向)に延びた境界線に沿って、長さ100mm、幅は凹部44(44Y)の幅の設計寸法に合わせて、フェザー社製片刃剃刀を用いて、細いストライプ状の凹部44(44Y)の小片5個を切り出す。得られた小片5個をそれぞれ電子天秤(A&D社製電子天秤GR-300、精度:小数点以下4桁)を用いて測定し、平均して凹部44(44Y)の小片1個の平均重量を求める。求めた平均重量を凹部44(44Y)の小片1個当たりの平均面積で除して低坪量部41(44Y)の坪量を算出する。凹部44(44X)についても、凹部44(44Y)と同様にして坪量を算出する。 <Measuring method of basis weight of
The measuring method of the basic weight of the
Cut along the boundary line between the
Next, along the boundary line extending in the vertical direction (Y direction) of the
また、凹部44(44X,44Y)は、吸収体に空間を確保でき、体液の十分な拡散効果を得る観点から、液吸収前の状態で、その深さが吸収体4Aの厚み(凸部43の厚み)の20%以上、好ましくは25%以上、より好ましくは70%以上、そして、100%以下、好ましくは80%以下、より好ましくは75%以下、より具体的には、20%以上100%以下であることが好ましく、25%以上80%以下であることがより好ましく、70%以上75%以下であることが更に好ましい。
具体的には、凹部44(44X,44Y)の深さは、液吸収前の状態で、0.1mm以上、好ましくは0.2mm以上、より好ましくは3mm以上、そして、20mm以下、好ましくは10mm以下、より好ましくは4mm以下、より具体的には、0.1mm以上20mm以下であることが好ましく、0.2mm以上10mm以下であることがより好ましく、3mm以上4mm以下であることが更に好ましい。ここで、凹部44(44X,44Y)の深さとは、吸収体4Aの厚み(凸部43の厚み)から凹部44(44X,44Y)の厚みを差し引いた値と同じである。
尚、凸部43及び凹部44(44X,44Y)の厚みは、液吸収前の状態で、例えば吸収体4Aを、鋭利なかみそりで、図1に示す縦方向(Y方向)、又は横方向(X方向)に切断し、荷重をせずに、この切断されたサンプルの断面を測定する。凸部43の厚みは凸部の中で最も厚い位置で測定した値であり、凹部44(44X,44Y)の厚みは凹部の中で最も薄い位置で測定した値である。肉眼にて測定し難い場合には、前記切断されたサンプルの断面を、例えば、マイクロスコープ(KEYENCE社製VHX-1000)を用いて10~50倍の倍率で観察し、測定してもよい。 When the
In addition, the recess 44 (44X, 44Y) can secure a space in the absorber, and from the viewpoint of obtaining a sufficient diffusion effect of body fluid, the depth of the recess 44 (the protrusion 43) is in the state before absorbing the liquid. 20% or more, preferably 25% or more, more preferably 70% or more, and 100% or less, preferably 80% or less, more preferably 75% or less, and more specifically 20% or more 100. % Is preferably 25% or more and 80% or less, and more preferably 70% or more and 75% or less.
Specifically, the depth of the recess 44 (44X, 44Y) is 0.1 mm or more, preferably 0.2 mm or more, more preferably 3 mm or more, and 20 mm or less, preferably 10 mm in a state before liquid absorption. Hereinafter, more preferably 4 mm or less, more specifically 0.1 mm or more and 20 mm or less, more preferably 0.2 mm or more and 10 mm or less, and further preferably 3 mm or more and 4 mm or less. Here, the depth of the concave portion 44 (44X, 44Y) is the same as the value obtained by subtracting the thickness of the concave portion 44 (44X, 44Y) from the thickness of the
In addition, the thickness of the
また、凹部44(44X,44Y)は、液吸収後の状態で、その深さが吸収体4Aの厚み(凸部43の厚み)の20%以上、好ましくは50%以上、より好ましくは65%以上、そして、100%以下、好ましくは80%以下、より好ましくは75%以下、より具体的には、20%以上100%以下であることが好ましく、50%以上80%以下であることがより好ましく、65%以上75%以下であることが更に好ましい。
具体的には、凹部44(44X,44Y)の深さは、液吸収後の状態で、0.2mm以上、好ましくは2mm以上、より好ましくは5.5mm以上、そして、30mm以下、好ましくは10mm以下、より好ましくは7.5mm以下、より具体的には、0.2mm以上30mm以下であることが好ましく、2mm以上10mm以下であることがより好ましく、5.5mm以上7.5mm以下であることが更に好ましい。 In the case where the
Further, the recess 44 (44X, 44Y) has a depth of 20% or more, preferably 50% or more, more preferably 65% of the thickness of the
Specifically, the depth of the recess 44 (44X, 44Y) is 0.2 mm or more, preferably 2 mm or more, more preferably 5.5 mm or more, and 30 mm or less, preferably 10 mm, in the state after liquid absorption. Hereinafter, more preferably 7.5 mm or less, and more specifically 0.2 mm or more and 30 mm or less, more preferably 2 mm or more and 10 mm or less, and 5.5 mm or more and 7.5 mm or less. Is more preferable.
凹部44(44X,44Y)は、吸収性物品が例えば使い捨ておむつに用いられる場合においては、吸収体に空間を確保でき、体液の十分な拡散効果と素早い吸収性の観点から、液吸収前の状態で、その密度が、凸部43の密度の30%以上100%以下であることが好ましい。
具体的には、凹部44(44X,44Y)は、液吸収前の状態で、その密度が0.01g/cm3以上1.2g/cm3以下であることが好ましい。また、凸部43は、液吸収前の状態で、その密度が0.01g/cm3以上1.2g/cm3以下であることが好ましい。
凸部43及び凹部44(44X,44Y)の密度は、上述した方法により求めた凸部43及び低密度部44の坪量を、上述した方法により求めたそれぞれの厚みで除して算出される。 In the
When the absorbent article is used in a disposable diaper, for example, the recess 44 (44X, 44Y) can secure a space in the absorbent body, and is in a state before liquid absorption from the viewpoint of sufficient diffusion effect of body fluid and quick absorbability. Therefore, the density is preferably 30% or more and 100% or less of the density of the
Specifically, the recess 44 (44X, 44Y) preferably has a density of 0.01 g / cm 3 or more and 1.2 g / cm 3 or less in a state before liquid absorption. Further, the
The density of the
以下、吸水性ポリマー41について具体的に説明する。 As described above, the absorbent body 3A includes the water
Hereinafter, the water-absorbing
遠心保持量(吸水量)の測定は、JIS K 7223(1996)に準拠して行う。ナイロン製の織布(三力製作所販売、品名:ナイロン網、規格:250メッシュ)を幅10cm、長さ40cmの長方形に切断して長手方向中央で二つ折りにし、両端をヒートシールして幅10cm(内寸9cm)、長さ20cmのナイロン袋を作製する。次いで、測定試料である吸水性ポリマー1.00gを精秤し、作製したナイロン袋の底部に均一になるように入れる。次いで、試料の入ったナイロン袋を、25℃に調温した生理食塩水(0.9質量%塩化ナトリウム水溶液)に浸漬させる。そして浸漬開始から1時間後にナイロン袋を生理食塩水から取り出し、1時間垂直状態に吊るして水切りした後、遠心脱水器(コクサン(株)製、型式H-130C特型)を用いて脱水する。脱水条件は、143G(800rpm)で10分間とする。脱水後、試料の質量を測定し、次式に従って目的とする遠心保持量(吸水量)を算出する。
遠心保持量(g/g)=(a'-b-c)/c
式中、a'は遠心脱水後の試料及びナイロン袋の総質量(g)、bはナイロン袋の吸水前(乾燥時)の質量(g)、cは試料の吸水前(乾燥時)の質量(g)を表す。測定は5回行い(n=5)、上下各1点の値を削除し、残る3点の平均値を測定値とする。尚、測定は23±2℃、湿度50±5%で行い、測定の前に試料を同環境で24時間以上保存した上で測定する。 <Measuring method of centrifugal retention (water absorption)>
The centrifugal retention amount (water absorption amount) is measured according to JIS K 7223 (1996). Nylon woven fabric (sold by Sanriki Seisakusho, product name: nylon net, standard: 250 mesh) is cut into a rectangle with a width of 10 cm and a length of 40 cm, folded in half at the center in the longitudinal direction, and heat sealed at both ends to a width of 10 cm A nylon bag having an inner dimension of 9 cm and a length of 20 cm is prepared. Next, 1.00 g of the water-absorbing polymer as a measurement sample is precisely weighed and placed uniformly at the bottom of the produced nylon bag. Next, the nylon bag containing the sample is immersed in physiological saline (0.9 mass% sodium chloride aqueous solution) adjusted to 25 ° C. After 1 hour from the start of immersion, the nylon bag is taken out from the physiological saline, suspended in a vertical state for 1 hour and drained, and then dehydrated using a centrifugal dehydrator (model H-130C special model manufactured by Kokusan Co., Ltd.). The dehydration condition is 143 G (800 rpm) for 10 minutes. After dehydration, the mass of the sample is measured, and the target centrifugal retention amount (water absorption amount) is calculated according to the following formula.
Centrifugal retention amount (g / g) = (a′−bc) / c
In the formula, a ′ is the total mass (g) of the sample and nylon bag after centrifugal dehydration, b is the mass (g) of the nylon bag before water absorption (during drying), and c is the mass of the sample before water absorption (during drying). (G) is represented. The measurement is performed 5 times (n = 5), the values at each of the upper and lower points are deleted, and the average value of the remaining three points is taken as the measured value. The measurement is performed at 23 ± 2 ° C. and
加圧下吸収量は、特開2003-235889号公報に記載されている測定方法及び測定装置を利用して測定される。即ち、目開き63μmのナイロン網(JIS Z8801-1:2000を底面に貼った円筒プラスチックチューブ(内径30mm、高さ60mm)を用意する。次いで、試料(吸水性ポリマー)0.50gを精秤し、垂直にした円筒プラスチックチューブのナイロン網上に試料がほぼ均一の厚さになるように入れる。次いで、2.0kPaの荷重が試料にかかるように外径29.5mm×厚さ22mmの分銅を円筒プラスチックチューブ内に挿入する。次いで、生理食塩水60mlの入ったシャーレ(直径:120mm)の中に試料及び分銅の入った円筒プラスチックチューブを、ナイロン網側を下面にして垂直に浸す。そして、浸しながら60分放置した後に、試料及び分銅の入った円筒プラスチックチューブを取り出し、15分水切りした後に、試料及び分銅の入った円筒プラスチックチューブを計量し、試料が吸収した生理食塩水の重量を算出する。この吸収した生理食塩水の重量を0.5で除した値を加圧下吸収量(g/g)とする。測定は5回行い(n=5)、上下各1点の値を削除し、残る3点の平均値を測定値とする。尚、測定は23±2℃、湿度50±5%で行い、測定の前に試料を同環境で24時間以上保存した上で測定する。 <Measurement method of absorption under pressure>
The amount of absorption under pressure is measured using a measuring method and measuring apparatus described in JP-A-2003-235889. That is, prepare a nylon mesh with a mesh size of 63 μm (cylindrical plastic tube (inner diameter 30 mm,
加圧下通液速度は、特開2003-235889号公報に記載されている測定方法及び測定装置を利用して測定される。即ち、100mLのガラスビーカーに、測定試料である吸水性ポリマー0.32±0.005gを膨潤するに十分な量の生理食塩水(0.9質量%塩化ナトリウム水溶液)、例えば吸水性ポリマーの飽和吸収量の5倍以上の生理食塩水に浸して30分間放置する。別途、垂直に立てた円筒(内径25.4mm)の開口部の下端に、金網(目開き150μm、株式会社三商販売のバイオカラム焼結ステンレスフィルター30SUS)と、コック(内径2mm)付き細管(内径4mm、長さ8cm)とが備えられた濾過円筒管を用意し、コックを閉鎖した状態で該円筒管内に、膨潤した測定試料を含む前記ビーカーの内容物全てを投入する。次いで、目開きが150μmで直径が25mmである金網を先端に備えた直径2mmの円柱棒を濾過円筒管内に挿入して、該金網と測定試料とが接するようにし、更に測定試料に2.0kPaの荷重が加わるようにおもりを載せる。この状態で1分間放置した後、コックを開いて液を流し、濾過円筒管内の液面が60mLの目盛り線から40mLの目盛り線に達する(つまり20mLの液が通過する)までの時間(T1)(秒)を計測する。計測された時間T1(秒)を用い、次式から2.0kPaでの加圧下通液速度を算出する。尚、式中、T0(秒)は、濾過円筒管内に測定試料を入れないで、生理食塩水20mlが金網を通過するのに要する時間を計測した値である。
加圧下通液速度(ml/min)=20×60/(T1-T0)
測定は5回行い(n=5)、上下各1点の値を削除し、残る3点の平均値を測定値とする。尚、測定は23±2℃、湿度50±5%で行い、測定の前に試料を同環境で24時間以上保存した上で測定する。加圧下通液速度の更に詳細な測定方法は、特開2003-235889号公報の段落〔0008〕及び段落〔0009〕に記載されており、また測定装置は、同公報の図1及び図2に記載されている。 <Measurement method of liquid flow rate under pressure>
The liquid passing speed under pressure is measured using a measuring method and measuring apparatus described in JP-A-2003-235889. That is, in a 100 mL glass beaker, a sufficient amount of physiological saline (0.9% by mass sodium chloride aqueous solution) to swell the measurement sample water-absorbing polymer 0.32 ± 0.005 g, for example, water-absorbing polymer saturation. Immerse in physiological saline more than 5 times the amount of absorption and leave for 30 minutes. Separately, at the lower end of an opening of a vertically standing cylinder (inner diameter 25.4 mm), a wire mesh (mesh opening 150 μm, biocolumn sintered stainless steel filter 30SUS sold by Sansho Co., Ltd.) and a capillary (with an inner diameter of 2 mm) ( A filtration cylindrical tube having an inner diameter of 4 mm and a length of 8 cm) is prepared, and the contents of the beaker including the swollen measurement sample are put into the cylindrical tube with the cock closed. Next, a cylindrical rod having a diameter of 2 mm with a wire mesh having an opening of 150 μm and a diameter of 25 mm is inserted into the filtration cylindrical tube so that the wire mesh and the measurement sample are in contact with each other. Put a weight so that the load of. After standing for 1 minute in this state, the cock is opened to flow the liquid, and the time until the liquid level in the filtration cylindrical tube reaches the 40 mL scale line from the 60 mL scale line (that is, 20 mL of liquid passes) (T1). (Seconds) is measured. Using the measured time T1 (seconds), the liquid flow rate under pressure at 2.0 kPa is calculated from the following equation. In the formula, T0 (seconds) is a value obtained by measuring the time required for 20 ml of physiological saline to pass through the wire mesh without putting the measurement sample in the filtering cylindrical tube.
Flow rate under pressure (ml / min) = 20 × 60 / (T1-T0)
The measurement is performed 5 times (n = 5), the values at each of the upper and lower points are deleted, and the average value of the remaining three points is taken as the measured value. The measurement is performed at 23 ± 2 ° C. and
DW法による吸収速度は、特開平6-136012号公報に記載されている測定方法及び測定装置を利用して測定される。即ち、Demand Wettability Tester装置を用いて測定される。具体的には、該装置において生理食塩水の液面を、ポリマー散布台〔70mmφ、No,2濾紙をガラスフィルターNo,1上に置いた台〕の表面と等水位にセットし、該ポリマー散布台の表面上に測定対象の吸水性ポリマーを0.3g散布する。吸水性ポリマーを散布した時点の吸水量を0とし、1分経過後及び10分経過後それぞれの吸水量を測定する。この吸水量は、生理食塩水の水位の低下量を示すビュレットの目盛りで測定される。得られた吸水量の値をDW法による吸収速度とする。測定は5回行い(n=5)、上下各1点の値を削除し、残る3点の平均値を測定値とする。尚、測定は23±2℃、湿度50±5%で行い、測定の前に試料を同環境で24時間以上保存した上で測定する。 <Measurement method of absorption rate by DW method>
The absorption rate by the DW method is measured using a measuring method and measuring apparatus described in JP-A-6-136010. That is, it is measured using a Demand Wetability Tester device. Specifically, in this apparatus, the level of the physiological saline solution is set to the same level as the surface of the polymer spray table [70 mmφ, No, 2 filter paper placed on the glass filter No, 1], and the polymer spray is set. Sprinkle 0.3 g of the water-absorbing polymer to be measured on the surface of the table. The amount of water absorption at the time when the water-absorbing polymer is sprayed is 0, and the amount of water absorption is measured after 1 minute and after 10 minutes. The amount of water absorption is measured by a burette scale indicating the amount of decrease in the saline water level. The obtained water absorption value is defined as an absorption rate by the DW method. The measurement is performed 5 times (n = 5), the values at each of the upper and lower points are deleted, and the average value of the remaining three points is taken as the measured value. The measurement is performed at 23 ± 2 ° C. and
本発明において、吸水性ポリマーの利用効率(ここでは、膨潤倍率と同じ意味)50~70%でゲルロッキングが起こる状態となる程度に表面処理を行うことが必要となる。吸水性ポリマーの製造においては、悪影響を与えない範囲で各種添加剤を共存させることができる。かかる添加剤の具体例としては、澱粉-セルロ-ス、澱粉-セルロ-スの誘導体、ポリビニルアルコール、ポリアクリル酸(塩)、ポリアクリル酸(塩)架橋体、ポリエチレングリコール、ポリビニルピロリドン等の分散助剤やキノン類などの重合禁止剤、連鎖移動剤、キレート剤等である。 Examples of surface treatment agents include surface modifying oils such as modified silicones; polyvalent metal compounds such as aluminum sulfate, potassium alum, ammonium alum, sodium alum, (poly) aluminum chloride, and their hydrates; And cationic compounds such as dialkylamine and salts thereof; polycation compounds such as polyethyleneimine, polyvinylamine, and polyallylamine; and salts thereof; inorganic fine particles such as silica, alumina, titanium oxide, zinc oxide, and bentonite; Only 1 type may be used and 2 or more types may be used together.
In the present invention, it is necessary to perform the surface treatment to such an extent that gel locking occurs at a utilization efficiency of the water-absorbing polymer (here, the same meaning as the swelling ratio) of 50 to 70%. In the production of the water-absorbing polymer, various additives can coexist in a range that does not adversely affect the polymer. Specific examples of such additives include starch-cellulose, starch-cellulose derivatives, polyvinyl alcohol, polyacrylic acid (salt), crosslinked polyacrylic acid (salt), polyethylene glycol, polyvinylpyrrolidone, and the like. Polymerization inhibitors such as auxiliaries and quinones, chain transfer agents, chelating agents and the like.
図7には、吸収体4Aの製造方法の一実施態様及びそれに用いる製造装置が示されている。吸収体4Aの製造装置は、矢印R1方向に回転駆動される回転ドラム50と、回転ドラム50の外周面に吸収体4Aの原料である吸水性ポリマー41及び親水性繊維42を含む吸収性材料45を供給するダクト60と、回転ドラム50の下流側の斜め下方に配置され、矢印R2方向に回転駆動されるトランスファーロール70と、回転ドラム50の周方向におけるダクト60とトランスファーロール70との間に配置されたバキュームボックス65と、バキュームボックス65と回転ドラム50との間及びトランスファーロール70と回転ドラム50との間を通るように配された、シート状の通気性部材であるメッシュベルト75と、トランスファーロール70の下方に配されたバキュームコンベア80とを備えている。 Next, the manufacturing method of 4 A of absorbers with which the diaper 1 is provided, ie, the
FIG. 7 shows an embodiment of a method for manufacturing the
先ず、回転ドラム50内の空間56、及びバキュームボックス65内を、それぞれに接続された排気装置を作動させて負圧にする。このように、空間56内を負圧にすることで、ダクト60内に、吸収性材料45を回転ドラム50の外周面に搬送させる空気流が生じるからである。次に、回転ドラム50及びトランスファーロール70を回転させ、また、バキュームコンベア80を作動させる。そして、前記繊維材料導入装置を作動させて、ダクト60内に、先ず解繊したパルプ(親水性繊維)を供給する。パルプ(親水性繊維)は、ダクト60内を流れる空気流に乗り、飛散状態となって回転ドラム50の外周面に向けて供給される。 Next, a method for continuously manufacturing the
First, the exhaust device connected to each of the
表面シート2、裏面シート3、立体ギャザー形成用シート62としては、通常、使い捨ておむつ等の吸収性物品に用いられるものであれば、特に制限なく用いることができる。例えば、表面シート2としては、液透過性の不織布や、開孔フィルム、これらの積層体等を用いることができ、裏面シート3としては、樹脂フィルムや樹脂フィルムと不織布の積層体等を用いることができる。立体ギャザー形成用シート62としては、伸縮性のフィルム、不織布、織物またはそれらの積層シート等を用いることができる。
ファスニングテープ7としては、通常、使い捨ておむつ等の吸収性物品に用いられるものであれば、特に制限なく用いることができる。例えば、「マジックテープ(登録商標)」(クラレ社製)、「クイックロン(登録商標)」(YKK社製)、「マジクロス(登録商標)」(カネボウベルタッチ社製)等におけるオス部材等を用いることができる。 The formation material of the disposable diaper 1 of this embodiment is demonstrated.
As the
The
立体ギャザー形成用の弾性部材61、レッグ弾性部材63、及びウエスト部弾性部材64としては、天然ゴム、ポリウレタン、ポリスチレン-ポリイソプレン共重合体、ポリスチレン-ポリブタジエン共重合体、アクリル酸エチル-エチレン等のポリエチレン-αオレフィン共重合体等からなる糸状の伸縮性材料を用いることができる。 As the
Examples of the
吸収体4Aは、液吸収前において、図6に示すように、吸水性ポリマー41と親水性繊維42との重量比(吸水性ポリマー41の重量/親水性繊維42の重量)が1以上である第1領域4Fに連続して配された、第1領域4Fよりも吸水性ポリマー41及び親水性繊維42それぞれの含有量が多い第2領域4Sを有しているので、体液吸収後に、図4に示すように、第2領域4Sの吸水性ポリマー41の膨潤が、第1領域4Fの吸水性ポリマー41に比べて、積極的に発生し易い。その為、体液吸収後、図4に示すように、第2領域4Sを厚み方向に貫通する凹部44の壁面に膨潤した吸水性ポリマー41が重なり合い吸収体の空間9が確保され易い。このような空間9が体液吸収後に確保されると、体液が空間9を通って更に外方に拡散されるようになる。このように体液が十分に拡散すると、排泄部領域(体液吸収ポイント付近)での液戻り量が少なく、ドライ感が向上する。特に、第1実施形態の吸収体4Aにおいては、第2領域4Sが第1領域4Fの非肌対向面側に配されており、凹部44が吸収体4Aの非肌対向面側から肌対向面側に凹んで形成されており、吸収体4Aの肌対向面が第1領域4Fで形成されている。即ち、凹部44の頂部に第1領域4Fが配された形態となっているので、体液吸収後、図4に示すように、排泄部領域(体液吸収ポイント付近)では、第2領域4Sに遅れて第2領域4Sよりも含有量の少ない第1領域4Fの吸水性ポリマー41が膨潤しゲルブロッキングが発生し、空間9内の体液が肌対向面側に戻るのを防ぎ易くなり、排泄部領域(体液吸収ポイント付近)での液戻り量が更に少なくなり、ドライ感もさらに向上する。また、吸収体4Aは、第2領域4Sに連続して配された第3領域4Tを有している。乾燥状態において、第2領域4Sは、吸水性ポリマー41と親水性繊維42との重量比(吸水性ポリマー41の重量/親水性繊維42の重量)が1以上であるのに対し、第3領域4Tは、第2領域4Sよりも吸水性ポリマー41及び親水性繊維42それぞれの含有量が少なく、吸水性ポリマー41と親水性繊維42との重量比(吸水性ポリマー41の重量/親水性繊維42の重量)が0.5以下である。そのため、親水性繊維リッチ層である第3領域4Tは、吸収体の長さ方向の端部で有効に作用し、毛管力により体液を一層外方に拡散する一助となる。 The effect at the time of using the
As shown in FIG. 6, the absorbent 4 </ b> A has a weight ratio of the water-absorbing
また、第1実施形態の吸収体4Aにおいては、第2領域4Sが、吸水性ポリマー41と親水性繊維42との重量比(吸水性ポリマー41の重量/親水性繊維42の重量)が1以上となるように形成されているので、上述したように、体液吸収後、図4に示すように、第2領域4Sを厚み方向に貫通する凹部44の壁面に膨潤した吸水性ポリマー41が重なり合い吸収体の空間9が確保され易い。
また、第1実施形態の吸収体4Aにおいては、使用する吸水性ポリマー41が、前述の吸水量を有し、前述の2.0kPaでの加圧下吸収量を有し、2.0kPaでの加圧下通液速度が1ml/min未満と遅いものである。このことより、上述したように体液吸収後、第1領域4Fでゲルブロッキングが発生しやすくなり、排泄部領域での液戻り量がさらに少なくなり、ドライ感もさらに向上する。
また、第1実施形態の吸収体4Aにおいては、使用する吸水性ポリマー41が、特に前述のDW吸収速度を有するように設計されているので、体液吸収の初期では吸水性ポリマー41の吸収速度が遅いため、第1領域4Fでのゲルブロッキングの発生を遅らせることができ、体液吸収の後期において第1領域4Fでのゲルブロッキングを発生させ、排泄部領域での液戻り量がさらに少なくなり、ドライ感もさらに向上する。 In the present invention, the absorber is designed so as to cause gel blocking, and the following four ideas are incorporated. (1) It has a passage structure (space 9) that diffuses as much liquid as possible before the water-absorbing
In the
In the
Further, in the
上述したように、吸収体4Aは、体液吸収後、体液を十分に拡散し易く、排泄部領域(体液吸収ポイント付近)での液戻り量を少なくし易いので、吸収体4Aを用いた使い捨ておむつ1は、体液吸収後ドライ感が向上し、使用中の快適性が向上する。 The effect at the time of using the disposable diaper 1 which is one Embodiment of the absorbent article of this invention using the
As described above, the
第2実施形態の吸収体4Bについては、第1実施形態の吸収体4Aと異なる点について説明する。特に説明しない点は、吸収体4Aと同様であり、吸収体4Aの説明が適宜適用される。 Next, an
About the
列44Bを形成する凹部44は、1本の列44Bあたり1個以上10個以下配されていることが好ましく、例えば吸収体4Bにおいては3個配されている。
横方向(X方向)に隣り合う列44B同士の間隔L5(図10参照)は、吸収性物品が例えば使い捨ておむつに用いられる場合においては、5mm以上50mm以下であることが好ましい。
各凹部44は、吸収性物品が例えば使い捨ておむつに用いられる場合においては、その横方向(X方向)の長さL6が、1mm以上25mm以下であることが好ましく、その縦方向(Y方向)の長さL7が、15mm以上500mm以下であることが好ましい。 It is preferable that one or more and five or
The number of
The distance L5 (see FIG. 10) between the
In the case where the absorbent article is used for, for example, a disposable diaper, each
吸収体4Bにおける凸部43及び凹部44の坪量及び密度等については、吸収体4Aにおける凸部43及び凹部44の坪量及び密度等と同様である。 As shown in FIG. 10, the
About the basic weight, density, etc. of the
吸収体4Bの効果については、吸収体4Aの効果と異なる点について説明する。特に説明しない点は、吸収体4Aの効果と同様であり、吸収体4Aの効果の説明が適宜適用される。
尚、吸収体4Bの形成材料については、吸収体4Aの形成材料と同様である。 The effect at the time of using the
About the effect of the
The material for forming the
また、中間シート5は、吸収体4A,4Bを包む所謂コアラップシートであったが、例えば、吸収体4A,4Bの肌対向面を覆うように表面シート2と吸収体4A,4Bとの間に配される親水性の所謂サブレイヤーシートであってもよい。 Although the disposable diaper 1 using the
The
吸水性ポリマーと親水性繊維とを含む吸収体であって、
吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1以上である第1領域と、
該第1領域よりも吸水性ポリマー及び親水性繊維それぞれの含有量が多い第2領域とを有し、
前記第1領域及び前記第2領域は、厚み方向に連続して配されており、
0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態において、前記第2領域を厚み方向に貫通する凹部が形成されている吸収体。 <1>
An absorbent body comprising a water-absorbing polymer and hydrophilic fibers,
A first region in which a weight ratio of the water-absorbing polymer to the hydrophilic fiber (weight of the water-absorbing polymer / weight of the hydrophilic fiber) is 1 or more;
A second region having a higher content of each of the water-absorbing polymer and the hydrophilic fiber than the first region,
The first region and the second region are continuously arranged in the thickness direction,
An absorbent body in which a concave portion penetrating through the second region in the thickness direction is formed after a lapse of 5 minutes after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 .
前記塩化ナトリウム水溶液を供給する前の状態において、前記第2領域を厚み方向に貫通する凹部が形成されている前記<1>に記載の吸収体。
<3>
前記吸収体は、前記凹部と前記凹部により区画された凸部とを有し、前記凹部における吸収性材料の坪量及び密度が、前記凸部における吸収性材料の坪量及び密度と同じかそれらよりも低くなっている、前記<1>又は<2>に記載の吸収体。
<4>
該第2領域よりも吸水性ポリマー及び親水性繊維それぞれの含有量が少なく、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が0.5以下である第3領域を有し、
前記第1領域、前記第2領域及び前記第3領域は、厚み方向に連続して配されており、 前記凹部は、前記第2領域及び前記第3領域を厚み方向に貫通している前記<1>~<3>の何れか1に記載の吸収体。
<5>
前記第2領域は、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1以上である前記<1>~<4>の何れか1に記載の吸収体。
<6>
前記凹部は、液吸収前の状態で、その深さが前記吸収体の厚みの20%以上100%以下である前記<1>~<5>の何れか1に記載の吸収体。
<7>
前記凹部は、その坪量が、前記凸部の0%以上、80%以下である、前記<3>~<6>の何れか1に記載の吸収体。
<8>
前記吸収体は、液吸収前の状態で、その厚みが0.5mm以上20mm以下である前記<1>~<7>の何れか1に記載の吸収体。
<9>
前記吸水性ポリマーは、その吸水量が30g/g以上50g/g以下であり、2.0kPaでの加圧下吸収量が20g/g以上40g/g以下であり、2.0kPaでの加圧下通液速度が1ml/min未満であり、DW法に従い測定された吸収速度が40ml/(g・10分)以上60ml/(g・10分)以下である前記<1>~<8>の何れか1に記載の吸収体。
<10>
前記吸水性ポリマーは、その吸水量が30g/g以上50g/g以下であり、2.0kPaでの加圧下吸収量が20g/g以上40g/g以下であり、2.0kPaでの加圧下通液速度が1ml/min未満であり、DW法に従い測定された吸収速度が42ml/(g・10分)以上55ml/(g・10分)以下である前記<1>~<9>の何れか1に記載の吸収体。
<11>
前記吸水性ポリマーは、DW法に従い測定された吸収速度が5ml/(g・1分)以上13ml/(g・1分)以下である前記<1>~<10>の何れか1に記載の吸収体。 <2>
The absorbent body according to <1>, wherein a concave portion penetrating the second region in the thickness direction is formed in a state before the sodium chloride aqueous solution is supplied.
<3>
The absorbent body has the concave portion and a convex portion partitioned by the concave portion, and the basis weight and density of the absorbent material in the concave portion are the same as the basis weight and density of the absorbent material in the convex portion or the like. The absorber according to <1> or <2>, which is lower than the above.
<4>
The content of each of the water-absorbing polymer and the hydrophilic fiber is less than that in the second region, and the weight ratio of the water-absorbing polymer to the hydrophilic fiber (weight of the water-absorbing polymer / weight of the hydrophilic fiber) is 0.5 or less. Having a third region,
The first region, the second region, and the third region are continuously arranged in the thickness direction, and the recess penetrates the second region and the third region in the thickness direction. The absorbent material according to any one of 1> to <3>.
<5>
The second region is any one of <1> to <4>, wherein the weight ratio of the water absorbent polymer to the hydrophilic fiber (weight of the water absorbent polymer / weight of the hydrophilic fiber) is 1 or more. Absorber.
<6>
The absorbent according to any one of <1> to <5>, wherein the recess has a depth of 20% to 100% of the thickness of the absorber before absorption.
<7>
The absorbent according to any one of <3> to <6>, wherein the concave portion has a basis weight of 0% to 80% of the convex portion.
<8>
The absorber according to any one of <1> to <7>, wherein the absorber has a thickness of 0.5 mm to 20 mm before liquid absorption.
<9>
The water-absorbing polymer has a water absorption amount of 30 g / g or more and 50 g / g or less, an absorption amount under pressure at 2.0 kPa of 20 g / g or more and 40 g / g or less, and a pressure reduction under 2.0 kPa. Any one of <1> to <8>, wherein the liquid speed is less than 1 ml / min, and the absorption speed measured according to the DW method is 40 ml / (g · 10 minutes) to 60 ml / (g · 10 minutes) 1. The absorbent body according to 1.
<10>
The water-absorbing polymer has a water absorption amount of 30 g / g or more and 50 g / g or less, an absorption amount under pressure at 2.0 kPa of 20 g / g or more and 40 g / g or less, and a pressure reduction under 2.0 kPa. Any one of <1> to <9>, wherein the liquid speed is less than 1 ml / min, and the absorption speed measured according to the DW method is 42 ml / (g · 10 minutes) to 55 ml / (g · 10 minutes) 1. The absorbent body according to 1.
<11>
The water-absorbing polymer according to any one of <1> to <10>, wherein the absorption rate measured according to the DW method is 5 ml / (g · 1 minute) to 13 ml / (g · 1 minute). Absorber.
前記吸水性ポリマーは、DW法に従い測定された吸収速度が8ml/(g・1分)以上13ml/(g・1分)以下である前記<1>~<11>の何れか1に記載の吸収体。
<13>
前記第1領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の比(第2領域/第1領域)は、好ましくは1.6倍以上、より好ましくは2.0倍以上、更に好ましくは2.1倍以上である<1>~<12>の何れか1に記載の吸収体。
<14>
前記第1領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の比(第2領域/第1領域)は、好ましくは2.5倍以下、より好ましくは2.3倍以下、更に好ましくは2.25倍以下である<1>~<13>の何れか1に記載の吸収体。
<15>
前記第1領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の差(第2領域-第1領域)は、好ましくは45g/cm2以上、より好ましくは70g/cm2以上、更に好ましくは90g/cm2以上である<1>~<14>の何れか1に記載の吸収体。
<16>
前記第1領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の比(第2領域-第1領域)は、好ましくは150g/cm2以下、より好ましくは120g/cm2以下、更に好ましくは100g/cm2以下である<1>~<15>の何れか1に記載の吸収体。
<17>
前記第3領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の比(第2領域/第3領域)は、好ましくは15倍以上、より好ましくは17倍以上である<1>~<16>の何れか1に記載の吸収体。
<18>
前記第3領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の比(第2領域/第3領域)は、好ましくは20倍以下、より好ましくは19倍以下である<1>~<17>の何れか1に記載の吸収体。
<19>
前記第3領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の差(第2領域-第3領域)は、好ましくは150g/cm2以上、より好ましくは160g/cm2以上である<1>~<18>の何れか1に記載の吸収体。
<20>
前記第3領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の比(第2領域-第3領域)は、好ましくは200g/cm2以下、より好ましくは180g/cm2以下である<1>~<19>の何れか1に記載の吸収体。
<21>
前記第3領域の親水性繊維の坪量に対する前記第2領域の親水性繊維の坪量の比(第2領域/第3領域)は、好ましくは1.4倍以上である<1>~<20>の何れか1に記載の吸収体。
<22>
前記第3領域の親水性繊維の坪量に対する前記第2領域の親水性繊維の坪量の比(第2領域/第3領域)は、好ましくは1.6倍以下である<1>~<21>の何れか1に記載の吸収体。
<23>
前記第3領域の親水性繊維の坪量に対する前記第2領域の親水性繊維の坪量の差(第2領域-第3領域)は、好ましくは25g/cm2以上である<1>~<22>の何れか1に記載の吸収体。
<24>
前記第3領域の親水性繊維の坪量に対する前記第2領域の親水性繊維の坪量の比(第2領域-第3領域)は、好ましくは35g/cm2以下である<1>~<23>の何れか1に記載の吸収体品。
<25>
肌対向面側に配された表面シートと、非肌対向面側に配された裏面シートと、これら両シート間に配された、前記<1>~<24>の何れか1に記載の吸収体とを備えた吸収性物品。
<26>
前記第2領域は、前記第1領域の肌対向面側に配されており、
前記凹部は、前記表面シート側から前記裏面シート側に凹んでいる前記<25>に記載の吸収性物品。
<27>
前記第2領域は、前記第1領域の非肌対向面側に配されており、
前記凹部は、前記裏面シート側から前記表面シート側に凹んでいる前記<25>に記載の吸収性物品。
<28>
前記吸収体と前記表面シートとの間に親水性の中間シートが配されている前記<25>~<27>の何れか1に記載の吸収性物品。
<29>
前記吸収体と前記裏面シートとの間に親水性の中間シートが配されている前記<25>~<28>の何れか1に記載の吸収性物品。
<30>
前記吸収体の前記凹部と前記中間シートとにより空間が形成されている<28>又は<29>に記載の吸収性物品。 <12>
The water-absorbing polymer according to any one of <1> to <11>, wherein the absorption rate measured according to the DW method is 8 ml / (g · 1 minute) or more and 13 ml / (g · 1 minute) or less. Absorber.
<13>
The ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the first region (second region / first region) is preferably 1.6 times or more, more preferably 2.0. The absorber according to any one of <1> to <12>, which is double or more, more preferably 2.1 or more.
<14>
The ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the first region (second region / first region) is preferably 2.5 times or less, more preferably 2.3. The absorber according to any one of <1> to <13>, which is not more than twice, more preferably not more than 2.25 times.
<15>
The difference in the basis weight of the water-absorbing polymer in the second region to the basis weight of the water-absorbing polymer in the first region (second region-first region) is preferably 45 g / cm 2 or more, more preferably 70 g /
<16>
The ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the first region (second region-first region) is preferably 150 g / cm 2 or less, more preferably 120 g /
<17>
The ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the third region (second region / third region) is preferably 15 times or more, more preferably 17 times or more. The absorbent material according to any one of <1> to <16>.
<18>
The ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the third region (second region / third region) is preferably 20 times or less, more preferably 19 times or less. The absorbent material according to any one of <1> to <17>.
<19>
The difference in the basis weight of the water-absorbing polymer in the second region with respect to the basis weight of the water-absorbing polymer in the third region (second region-third region) is preferably 150 g / cm 2 or more, more preferably 160 g / cm. The absorber according to any one of <1> to <18>, which is 2 or more.
<20>
The ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the third region (second region-third region) is preferably 200 g / cm 2 or less, more preferably 180 g /
<21>
The ratio of the basis weight of the hydrophilic fibers in the second region to the basis weight of the hydrophilic fibers in the third region (second region / third region) is preferably 1.4 times or more <1> to <20> The absorber according to any one of 20>.
<22>
The ratio of the basis weight of the hydrophilic fibers in the second region to the basis weight of the hydrophilic fibers in the third region (second region / third region) is preferably 1.6 times or less <1> to <21> The absorber according to any one of 21>.
<23>
The difference in the basis weight of the hydrophilic fibers in the second region relative to the basis weight of the hydrophilic fibers in the third region (second region-third region) is preferably 25 g / cm 2 or more <1> to <22>. The absorber according to any one of 22>.
<24>
The ratio of the basis weight of the hydrophilic fibers in the second region to the basis weight of the hydrophilic fibers in the third region (second region-third region) is preferably 35 g / cm 2 or less <1> to < The absorbent article according to any one of 23>.
<25>
The top sheet disposed on the skin facing surface side, the back sheet disposed on the non-skin facing surface side, and the absorption according to any one of the above <1> to <24> disposed between the both sheets An absorbent article comprising a body.
<26>
The second region is arranged on the skin facing surface side of the first region,
The absorbent article according to <25>, wherein the recess is recessed from the top sheet side to the back sheet side.
<27>
The second region is arranged on the non-skin facing surface side of the first region,
The absorbent article according to <25>, wherein the recess is recessed from the back sheet side to the top sheet side.
<28>
The absorbent article according to any one of <25> to <27>, wherein a hydrophilic intermediate sheet is disposed between the absorbent body and the top sheet.
<29>
The absorbent article according to any one of <25> to <28>, wherein a hydrophilic intermediate sheet is disposed between the absorbent body and the back sheet.
<30>
The absorbent article according to <28> or <29>, in which a space is formed by the concave portion of the absorbent body and the intermediate sheet.
攪拌機、還流冷却管、モノマー滴下口、窒素ガス導入管、温度計を取り付けた5L反応容器(アンカー翼使用)に分散剤としてポリオキシアルキレンエーテルリン酸エステル0.09%[対アクリル酸重量, 有効成分として]を仕込み、ノルマルヘプタン1500mlを加えた。窒素雰囲気下で回転数300r/minで撹拌し、90℃まで昇温した。
一方、2L三つ口フラスコ中に、東亞合成(株)製80%アクリル酸、イオン交換水を仕込み、氷冷しながら旭硝子(株)製48%苛性ソーダ水溶液を滴下し、モノマー水溶液としてのアクリル酸ナトリウム水溶液(72%中和品,濃度約48%)1054gを得た。このモノマー水溶液に、味の素(株)製N-アシル化グルタミン酸ソーダ(商品名アミソフトGS-11F)0.25gをイオン交換水3.0gに溶解させたものを添加し、暫く撹拌した後、528g(以下、モノマー水溶液A)、528g(以下、モノマー水溶液B)、に二分割した。
次いで、和光純薬工業(株)製2,2'-アゾビス(2-アミジノプロパン)ジヒドロクロリド(商品名V-50)0.06g、花王(株)製ポリエチレングリコール(PEG6000)0.20g、イオン交換水14gを混合溶解し、開始剤(A)水溶液を調製した。また、和光純薬工業(株)製過硫酸ナトリウム0.57gをイオン交換水10gに溶解し、開始剤(B)水溶液を調製した。さらに、クエン酸チタン水溶液(クエン酸/Tiモル比2.0、Ti量 0.015%対アクリル酸)を調製した。
モノマー水溶液Aに開始剤(A)水溶液を加えてモノマーAを調製し、モノマー水溶液Bに開始剤(A)水溶液とクエン酸チタン水溶液2.4gを加えてモノマーBを調製した。
前述の5L反応容器の内温が90℃であることを確認した後、モノマー滴下口からマイクロチューブポンプを用いて、モノマーA、モノマーBを順に約60分かけて滴下した。滴下終了後に共沸脱水を行い、吸水性ポリマー(ハイドロゲル)の含水量を60%に調整し、架橋剤としてナガセ化成工業(株)製エチレングリコールジグリシジルエーテル(商品名デナコールEX-810)0.16gを水10gに溶解したものを添加した。その後、更に共沸脱水を行い、ハイドロゲルの含水量を約1.5時間かけて50%に調整した。
このハイドロゲルに、花王(株)製第四級アンモニウム塩(商品名コータミン86W)1%(ハイドロゲルの固形分に対して)を水希釈して添加した。冷却後、シクロヘキサンを除き、減圧乾燥させることにより吸水性ポリマーを得た。850ミクロンの目開きの篩で粗大粒子を除去した。
得られた重合体粒子5.0g、10mmのジルコニアビーズ12個を50mLのスクリュー管に入れ、蓋を閉めて、入江商会製卓上型ビーズミル(V-1型)に載せ、10分間ビーズミル処理した。この操作を4回繰り返し、計20gの粒子を得た。この粒子100部に対し日本アエロジル(株)製アエロジル200 0.5部をドライブレンドすることにより吸水性ポリマーを得、大粒径の吸水性ポリマーをふるいわけによって除去し、平均粒径415μmの吸水性ポリマーAを得た。
得られた吸水性ポリマーAの物性としては、その吸水量が38g/gであり、2.0kPaでの加圧下吸収量が24g/gであり、2.0kPaでの加圧下通液速度が0ml/minであり、10分経過後の後期の吸収速度が46ml/(g・10分)であり、1分経過後の初期の吸収速度が11ml/(g・1分)であった。吸水性ポリマーの吸水量、加圧下吸収量、加圧下通液速度、並びに10分及び1分経過後の吸収速度は、上述した測定方法により測定した。 [Synthesis of water-absorbing polymer A]
Polyoxyalkylene ether phosphate 0.09% as a dispersant in a 5L reaction vessel (using anchor blades) equipped with a stirrer, reflux condenser, monomer dropping port, nitrogen gas inlet tube and thermometer [weight of acrylic acid, effective Were added as components, and 1500 ml of normal heptane was added. The mixture was stirred at a rotational speed of 300 r / min under a nitrogen atmosphere and heated to 90 ° C.
On the other hand, 80% acrylic acid manufactured by Toagosei Co., Ltd. and ion-exchanged water were charged into a 2 L three-necked flask, and a 48% sodium hydroxide aqueous solution manufactured by Asahi Glass Co., Ltd. was added dropwise while cooling with ice to prepare acrylic acid as a monomer aqueous solution. 1054 g of an aqueous sodium solution (72% neutralized product, concentration of about 48%) was obtained. A solution prepared by dissolving 0.25 g of N-acylated glutamic acid soda (trade name Amisoft GS-11F) manufactured by Ajinomoto Co., Inc. in 3.0 g of ion-exchanged water was added to this monomer aqueous solution, and after stirring for a while, 528 g ( Hereinafter, the monomer aqueous solution A) was divided into 528 g (hereinafter, monomer aqueous solution B).
Next, 0.02 g of 2,2′-azobis (2-amidinopropane) dihydrochloride (trade name V-50) manufactured by Wako Pure Chemical Industries, Ltd., 0.20 g of polyethylene glycol (PEG 6000) manufactured by Kao Corporation, ion 14 g of exchange water was mixed and dissolved to prepare an initiator (A) aqueous solution. In addition, 0.57 g of sodium persulfate manufactured by Wako Pure Chemical Industries, Ltd. was dissolved in 10 g of ion-exchanged water to prepare an initiator (B) aqueous solution. Further, a titanium citrate aqueous solution (citric acid / Ti molar ratio 2.0, Ti amount 0.015% with respect to acrylic acid) was prepared.
Monomer A was prepared by adding initiator (A) aqueous solution to monomer aqueous solution A, and monomer B was prepared by adding initiator (A) aqueous solution and titanium citrate aqueous solution 2.4 g to monomer aqueous solution B.
After confirming that the internal temperature of the aforementioned 5 L reaction vessel was 90 ° C., the monomer A and the monomer B were dropped in order over about 60 minutes using a microtube pump from the monomer dropping port. After completion of the dropwise addition, azeotropic dehydration was performed to adjust the water content of the water-absorbing polymer (hydrogel) to 60%, and ethylene glycol diglycidyl ether (trade name Denacol EX-810) manufactured by Nagase Chemical Industries Co., Ltd. .16 g dissolved in 10 g water was added. Thereafter, azeotropic dehydration was further performed, and the water content of the hydrogel was adjusted to 50% over about 1.5 hours.
To this hydrogel, 1% (based on the solid content of the hydrogel) of a quaternary ammonium salt (trade name Cotamine 86W) manufactured by Kao Corporation was added after diluting with water. After cooling, cyclohexane was removed and dried under reduced pressure to obtain a water-absorbing polymer. Coarse particles were removed with a 850 micron sieve.
5.0 g of the polymer particles obtained, 12 pieces of 10 mm zirconia beads were placed in a 50 mL screw tube, the lid was closed, and placed on a table-type bead mill (type V-1) manufactured by Irie Shokai Co., Ltd. and subjected to a bead mill treatment for 10 minutes. This operation was repeated four times to obtain a total of 20 g of particles. The water-absorbing polymer is obtained by dry blending 0.5 part of Aerosil 200 manufactured by Nippon Aerosil Co., Ltd. with respect to 100 parts of the particles, and the water-absorbing polymer having a large particle diameter is removed by sieving. Polymer A was obtained.
The physical properties of the water-absorbing polymer A thus obtained were as follows: its water absorption was 38 g / g, its absorption under pressure at 2.0 kPa was 24 g / g, and its flow rate under pressure at 2.0 kPa was 0 ml. / Min, the late absorption rate after 10 minutes was 46 ml / (g · 10 minutes), and the initial absorption rate after 1 minute was 11 ml / (g · 1 minutes). The water absorption amount of the water-absorbing polymer, the absorption amount under pressure, the liquid passing rate under pressure, and the absorption rate after 10 minutes and 1 minute were measured by the measurement method described above.
撹拌機,還流冷却管,モノマー滴下口,窒素ガス導入管,温度計を取り付けた5L反応容器(アンカー翼使用)に分散剤として花王(株)エマール20C(ポリオキシエチレン(EO平均付加モル数3)アルキル(C12))エーテル硫酸エステルNa)0.09%[対アクリル酸重量]を仕込み、シクロヘキサン1600mLを加えた。窒素ガスを吹き込み、アンカー翼を300r/minで撹拌し、内温76℃まで昇温した。
一方、2L三つ口フラスコ中に、東亞合成(株)製80%アクリル酸、イオン交換水を仕込み、氷冷しながら旭硝子(株)製48%苛性ソーダ水溶液を滴下し、モノマー水溶液としてのアクリル酸ナトリウム水溶液(72%中和品,濃度約48%)1054gを得た。このモノマー水溶液に、N-アシル化グルタミン酸ソーダ(味の素(株)製、商品名 アミソフトGS-11F)0.18gをイオン交換水3gに溶解させたものを添加し、暫く撹拌した後、264g(以下、モノマー水溶液A)、264g(以下、モノマー水溶液B)、528g(以下、モノマー水溶液C)に三分割した。
次いで、和光純薬工業(株)製2,2'-アゾビス(2-アミジノプロパン)ジヒドロクロリド(商品名V-50)0.12g、花王(株)製ポリエチレングリコール(PEG6000)0.20g、イオン交換水14gを混合溶解し、開始剤(A)水溶液を調製した。また、和光純薬工業(株)製過硫酸ナトリウム0.49gをイオン交換水10gに溶解し、開始剤(B)水溶液を調製した。さらに、クエン酸チタン水溶液(クエン酸/Tiモル比1.0、Ti量 0.015%対アクリル酸)を調製した。
モノマー水溶液Aに開始剤(A)水溶液7.2gを加えてモノマーAを調製し、モノマー水溶液Bに開始剤(A)水溶液7.2gとクエン酸チタン水溶液1.5gを加えてモノマーBを調製し、モノマー水溶液Cに開始剤(B)水溶液10.5gとクエン酸チタン水溶液3gを加えてモノマーCを調製した。
前述の5L反応容器の内温が77℃であることを確認した後、モノマー滴下口からマイクロチューブポンプを用いて、5分以上静置したモノマーA,モノマーB,モノマーCを順に約60分かけて滴下し重合した。重合終了後、脱水管を用いて共沸脱水を行い、吸水性ポリマー(ハイドロゲル)の含水量を60%に調整し、架橋剤としてナガセ化成工業(株)製エチレングリコールジグリシジルエーテル(商品名デナコールEX-810)0.20gを水10gに溶解したものを添加した。その後、更に共沸脱水を行い、ハイドロゲルの含水量を約1.5時間かけて40%に調整した。
このハイドロゲルに、花王(株)製第四級アンモニウム塩(商品名コータミン86W)
1%(ハイドロゲルの固形分に対して)を水希釈して添加した。冷却後、シクロヘキサンを除き、減圧乾燥させることにより吸水性ポリマーを得た。850ミクロンの目開きの篩で粗大粒子を除去した。
得られた重合体粒子5.0g、10mmのジルコニアビーズ12個を50mLのスクリュー管に入れ、蓋を閉めて、入江商会製卓上型ビーズミル(V-1型)に載せ、10分間ビーズミル処理した。この操作を4回繰り返し、計20gの粒子を得た。この粒子100部に対し日本アエロジル(株)製アエロジル200 0.5部をドライブレンドすることにより吸水性ポリマーを得、大粒径の吸水性ポリマーをふるいわけによって除去し、平均粒径390μmの吸水性ポリマーBを得た。
得られた吸水性ポリマーBの物性としては、その吸水量が39g/gであり、2.0kPaでの加圧下吸収量が20g/gであり、2.0kPaでの加圧下通液速度が0.3ml/minであり、10分経過後の後期の吸収速度が48ml/(g・10分)であり、1分経過後の初期の吸収速度が16ml/(g・1分)であった。吸水性ポリマーの吸水量、加圧下吸収量、加圧下通液速度、並びに10分及び1分経過後の吸収速度は、上述した測定方法により測定した。 [Synthesis of water-absorbing polymer B]
Kao Co., Ltd. Emar 20C (Polyoxyethylene (EO average added mole number 3) as a dispersant in a 5 L reaction vessel (using anchor blades) equipped with a stirrer, reflux condenser, monomer dropping port, nitrogen gas inlet tube, thermometer ) Alkyl (C12)) ether sulfate Na) 0.09% [weight of acrylic acid] was charged, and 1600 mL of cyclohexane was added. Nitrogen gas was blown, the anchor blade was stirred at 300 r / min, and the internal temperature was raised to 76 ° C.
On the other hand, 80% acrylic acid manufactured by Toagosei Co., Ltd. and ion-exchanged water were charged into a 2 L three-necked flask, and a 48% sodium hydroxide aqueous solution manufactured by Asahi Glass Co., Ltd. was added dropwise while cooling with ice to prepare acrylic acid as a monomer aqueous solution. 1054 g of an aqueous sodium solution (72% neutralized product, concentration of about 48%) was obtained. To this aqueous monomer solution, 0.18 g of N-acylated glutamic acid soda (product of Ajinomoto Co., Inc., trade name Amisoft GS-11F) dissolved in 3 g of ion-exchanged water was added, and after stirring for a while, 264 g (hereinafter referred to as “Amisoft GS-11F”). Monomer aqueous solution A), 264 g (hereinafter referred to as monomer aqueous solution B), and 528 g (hereinafter referred to as monomer aqueous solution C).
Next, 0.12 g of 2,2′-azobis (2-amidinopropane) dihydrochloride (trade name V-50) manufactured by Wako Pure Chemical Industries, Ltd., 0.20 g of polyethylene glycol (PEG 6000) manufactured by Kao Corporation, ion 14 g of exchange water was mixed and dissolved to prepare an initiator (A) aqueous solution. Moreover, 0.49 g of sodium persulfate manufactured by Wako Pure Chemical Industries, Ltd. was dissolved in 10 g of ion-exchanged water to prepare an initiator (B) aqueous solution. Further, a titanium citrate aqueous solution (citric acid / Ti molar ratio 1.0, Ti amount 0.015% with respect to acrylic acid) was prepared.
Monomer A is prepared by adding 7.2 g of initiator (A) aqueous solution to monomer aqueous solution A, and monomer B is prepared by adding 7.2 g of initiator (A) aqueous solution and 1.5 g of titanium citrate aqueous solution to monomer aqueous solution B. Then, 10.5 g of the initiator (B) aqueous solution and 3 g of the titanium citrate aqueous solution were added to the monomer aqueous solution C to prepare monomer C.
After confirming that the internal temperature of the 5 L reaction vessel was 77 ° C., the monomer A, the monomer B, and the monomer C that had been allowed to stand for 5 minutes or more from the monomer dropping port were sequentially applied over about 60 minutes. The solution was dropped and polymerized. After completion of the polymerization, azeotropic dehydration is performed using a dehydrating tube, the water content of the water-absorbing polymer (hydrogel) is adjusted to 60%, and ethylene glycol diglycidyl ether (trade name) manufactured by Nagase Chemical Industries, Ltd. is used as a crosslinking agent. Denacol EX-810) 0.20 g dissolved in 10 g of water was added. Thereafter, azeotropic dehydration was further performed, and the water content of the hydrogel was adjusted to 40% over about 1.5 hours.
To this hydrogel, a quaternary ammonium salt (trade name: Cotamin 86W) manufactured by Kao Corporation.
1% (based on the solid content of the hydrogel) was diluted with water and added. After cooling, cyclohexane was removed and dried under reduced pressure to obtain a water-absorbing polymer. Coarse particles were removed with a 850 micron sieve.
5.0 g of the polymer particles obtained, 12 pieces of 10 mm zirconia beads were placed in a 50 mL screw tube, the lid was closed, and placed on a table-type bead mill (type V-1) manufactured by Irie Shokai Co., Ltd. and subjected to a bead mill treatment for 10 minutes. This operation was repeated four times to obtain a total of 20 g of particles. The water-absorbing polymer is obtained by dry blending 0.5 part of Aerosil 200 manufactured by Nippon Aerosil Co., Ltd. with respect to 100 parts of the particles, and the water-absorbing polymer having a large particle diameter is removed by sieving. Polymer B was obtained.
The physical properties of the obtained water-absorbing polymer B are as follows: the water absorption is 39 g / g, the absorption under pressure at 2.0 kPa is 20 g / g, and the liquid passing rate under pressure at 2.0 kPa is 0. 0.3 ml / min, the late absorption rate after 10 minutes was 48 ml / (g · 10 minutes), and the initial absorption rate after 1 minute was 16 ml / (g · 1 minutes). The water absorption amount of the water-absorbing polymer, the absorption amount under pressure, the liquid passing rate under pressure, and the absorption rate after 10 minutes and 1 minute were measured by the measurement method described above.
吸水性ポリマーBの合成例において、分散剤として花王(株)エマール20C(ポリオキシエチレン(EO平均付加モル数3)アルキル(C12))エーテル硫酸エステルNa)0.09%[対アクリル酸重量]を0.11%に、架橋剤としてナガセ化成工業(株)製エチレングリコールジグリシジルエーテル(商品名デナコールEX-810)0.20gを0.25gに変更し、ビーズミル処理時間を10分から5分に変更した以外は同様の操作を行い吸水性ポリマーを得、大粒径の吸水性ポリマーをふるいわけによって除去し、平均粒径360μmの吸水性ポリマーCを得た。
得られた吸水性ポリマーCの物性としては、その吸水量が35g/gであり、2.0kPaでの加圧下吸収量が24g/gであり、2.0kPaでの加圧下通液速度が17ml/minであり、10分経過後の後期の吸収速度が51ml/(g・10分)であり、1分経過後の初期の吸収速度が20ml/(g・1分)であった。吸水性ポリマーの吸水量、加圧下吸収量、加圧下通液速度、並びに10分及び1分経過後の吸収速度は、上述した測定方法により測定した。 [Synthesis of water-absorbing polymer C]
In the synthesis example of the water-absorbing polymer B, Kao Corporation Emar 20C (polyoxyethylene (EO average addition mole number 3) alkyl (C12)) ether sulfate Na) 0.09% [weight of acrylic acid] as a dispersant Was changed to 0.11%, 0.20 g of ethylene glycol diglycidyl ether (trade name Denacol EX-810) manufactured by Nagase Kasei Kogyo Co., Ltd. was changed to 0.25 g as a crosslinking agent, and the bead mill treatment time was changed from 10 minutes to 5 minutes. A water-absorbing polymer was obtained in the same manner as described above except that the water-absorbing polymer having a large particle size was removed by sieving to obtain a water-absorbing polymer C having an average particle size of 360 μm.
The properties of the water-absorbing polymer C obtained were as follows: the water absorption was 35 g / g, the absorption under pressure at 2.0 kPa was 24 g / g, and the liquid flow rate under pressure at 2.0 kPa was 17 ml. / Min, the late absorption rate after 10 minutes was 51 ml / (g · 10 minutes), and the initial absorption rate after 1 minute was 20 ml / (g · 1 minutes). The water absorption amount of the water-absorbing polymer, the absorption amount under pressure, the liquid passing rate under pressure, and the absorption rate after 10 minutes and 1 minute were measured by the measurement method described above.
図7に示す装置を用いて図5,図6に示す吸収体を作製した。尚、作製した吸収体は、第3領域を有していない吸収体である。
吸水性ポリマーとしては吸水性ポリマーAを用い、親水性繊維としては開繊したパルプ(フラッフパルプ)を用いた。作製した吸収体について、以下、具体的に説明する。吸収体の第1領域4Fは、乾燥状態で、吸水性ポリマーの重量(坪量)が80g/m2であり、親水性繊維の重量(坪量)が50g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.6であった。 また、吸収体の第2領域4Sは、乾燥状態で、吸水性ポリマーの重量(坪量)が180g/m2であり、親水性繊維の重量(坪量)が150g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.2であった。 [Example 1]
The absorber shown in FIG. 5 and FIG. 6 was produced using the apparatus shown in FIG. In addition, the produced absorber is an absorber which does not have a 3rd area | region.
Water-absorbing polymer A was used as the water-absorbing polymer, and opened pulp (fluff pulp) was used as the hydrophilic fiber. The produced absorber will be specifically described below. In the
液吸収前の状態で、ブロック形状領域を構成する横方向(X方向)に延びる凹部44Xの幅L1は5mmであり、縦方向(Y方向)に延びる凹部44Yの幅L2は5mmであり、ブロック形状領域を構成する凸部43の縦方向(Y方向)の長さL3は40mmであり、凸部43の横方向(X方向)の長さL4は15mmであった。
また、乾燥状態で、凹部44(44X,44Y)の坪量は130g/m2であり、凸部43の坪量は460g/m2であった。
また、液吸収前の状態で、吸収体は、その厚みが5.0mmであり、凹部44(44X,44Y)は、その深さが3.5mmであり、該深さが吸収体の厚みの70%であった。
また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが9.5mmであり、凹部44(44X,44Y)は、その深さが7.0mmであり、該深さが吸収体の厚みの74%であった。尚、液吸収後の状態は、以下に示す測定法により測定した。 The absorber had a total length of 385 mm and a total width of 125 mm before liquid absorption. Further, the block-shaped region of the absorber had a length in the vertical direction (Y direction) of 375 mm and a total width in the horizontal direction (X direction) of 105 mm before liquid absorption. And the outer peripheral area |
Before the liquid absorption, the width L1 of the
Moreover, the basic weight of the recessed part 44 (44X, 44Y) was 130 g / m < 2 > in the dry state, and the basic weight of the
Further, in the state before liquid absorption, the absorber has a thickness of 5.0 mm, the recess 44 (44X, 44Y) has a depth of 3.5 mm, and the depth is the thickness of the absorber. 70%.
Moreover, in the state after liquid absorption (state after supply of 2000 g / m 2 of 0.9% by weight sodium chloride aqueous solution for 5 minutes), the absorbent body has a thickness of 9.5 mm, and the recess 44 ( 44X, 44Y) had a depth of 7.0 mm, and the depth was 74% of the thickness of the absorber. In addition, the state after liquid absorption was measured with the measuring method shown below.
吸収体を、水平に置いたガラス製の表面平滑なプレート上に配置した。配置する際には、プレートに対向する側の吸収体の面が凹凸構造となり、非対向する側の吸収体の面が平坦となるように配置した。そして、平坦な吸収体の面の上方から、ビュレットを用いて、0.9重量%の塩化ナトリウム水溶液を2000g/m2供給した。そして5分経過後の吸収体を、鋭利なかみそりで、垂直方向に切断して、吸収体の厚みを測定し、さらに、凹部の深さを測定した。吸収体の厚みは最も厚い位置で測定した値であり、凹部の厚みは最も薄い位置で測定した値である。測定は各吸収体について3サンプル測定し、測定された値の平均値を求め、表1に示した。 [Measurement method of thickness of absorber and depth of recess after liquid absorption]
The absorber was placed on a flat glass plate placed horizontally. When arranging, the surface of the absorber on the side facing the plate has an uneven structure, and the surface of the absorber on the non-opposing side is flat. Then, from the upper surface of the flat absorbent body, a 0.9 wt% sodium chloride aqueous solution was supplied at 2000 g / m 2 using a burette. And the absorber after 5 minutes passed was cut | disconnected with the sharp razor to the orthogonal | vertical direction, the thickness of the absorber was measured, and also the depth of the recessed part was measured. The thickness of the absorber is a value measured at the thickest position, and the thickness of the recess is a value measured at the thinnest position. The measurement was performed by measuring three samples for each absorber, and the average value of the measured values was obtained and shown in Table 1.
吸水性ポリマーとしては吸水性ポリマーBを用いる以外は、実施例1と同様にして、実施例2の吸収体を作製した。
液吸収前の状態で、吸収体は、その厚みが5.0mmであり、凹部44(44X,44Y)は、その深さが3.5mmであり、該深さが吸収体の厚みの70%であった。
また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが10.2mmであり、凹部44(44X,44Y)は、その深さが7.5mmであり、該深さが吸収体の厚みの74%であった。 [Example 2]
The absorbent body of Example 2 was produced in the same manner as in Example 1 except that the water absorbent polymer B was used as the water absorbent polymer.
In a state before liquid absorption, the absorber has a thickness of 5.0 mm, and the recess 44 (44X, 44Y) has a depth of 3.5 mm, which is 70% of the thickness of the absorber. Met.
Moreover, in the state after liquid absorption (state after supply of 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 for 5 minutes), the absorbent body has a thickness of 10.2 mm, and the recess 44 ( 44X, 44Y) had a depth of 7.5 mm, and the depth was 74% of the thickness of the absorber.
吸水性ポリマーとしては吸水性ポリマーCを用いる以外は、実施例1と同様にして、実施例3の吸収体を作製した。
液吸収前の状態で、吸収体は、その厚みが5.0mmであり、凹部44(44X,44Y)は、その深さが3.5mmであり、該深さが吸収体の厚みの70%であった。
また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが9.1mmであり、凹部44(44X,44Y)は、その深さが6.7mmであり、該深さが吸収体の厚みの74%であった。 [Example 3]
The absorbent body of Example 3 was produced in the same manner as in Example 1 except that the water absorbent polymer C was used as the water absorbent polymer.
In a state before liquid absorption, the absorber has a thickness of 5.0 mm, and the recess 44 (44X, 44Y) has a depth of 3.5 mm, which is 70% of the thickness of the absorber. Met.
Further, in the state after liquid absorption (state after 5 minutes have passed after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 ), the absorber has a thickness of 9.1 mm and has a recess 44 ( 44X, 44Y) had a depth of 6.7 mm, and the depth was 74% of the thickness of the absorber.
吸収体の第1領域4Fにおける吸水性ポリマーと親水性繊維との重量比、及び吸収体の第2領域4Sにおける吸水性ポリマーと親水性繊維との重量比を変更する以外は、実施例1と同様にして、実施例4の吸収体を作製した。吸水性ポリマーとしては、実施例1と同様に、吸水性ポリマーAを用いた。
具体的には、吸収体の第1領域4Fは、乾燥状態で、吸水性ポリマーの重量(坪量)が110g/m2であり、親水性繊維の重量(坪量)が80g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.38であった。
また、吸収体の第2領域4Sは、乾燥状態で、吸水性ポリマーの重量(坪量)が140g/m2であり、親水性繊維の重量(坪量)が120g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.17であった。
また、液吸収前の状態で、吸収体は、その厚みが4.5mmであり、凹部44(44X,44Y)は、その深さが2.3mmであり、該深さが吸収体の厚みの51%であった。 また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが8.8mmであり、凹部44(44X,44Y)は、その深さが5.0mmであり、該深さが吸収体の厚みの57%であった。 [Example 4]
Example 1 except that the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the
Specifically, in the
Further, the
Further, in the state before liquid absorption, the absorber has a thickness of 4.5 mm, and the recess 44 (44X, 44Y) has a depth of 2.3 mm, and this depth is the thickness of the absorber. 51%. Further, in the state after liquid absorption (state after 5 minutes have passed after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 ), the absorber has a thickness of 8.8 mm, and has a recess 44 ( 44X, 44Y) had a depth of 5.0 mm, which was 57% of the thickness of the absorber.
吸収体の第1領域4Fにおける吸水性ポリマーと親水性繊維との重量比、及び吸収体の第2領域4Sにおける吸水性ポリマーと親水性繊維との重量比を変更する以外は、実施例1と同様にして、実施例5の吸収体を作製した。吸水性ポリマーとしては、実施例1と同様に、吸水性ポリマーAを用いた。
具体的には、吸収体の第1領域4Fは、乾燥状態で、吸水性ポリマーの重量(坪量)が110g/m2であり、親水性繊維の重量(坪量)が80g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.38であった。
また、吸収体の第2領域4Sは、乾燥状態で、吸水性ポリマーの重量(坪量)が140g/m2であり、親水性繊維の重量(坪量)が120g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.17であった。
また、液吸収前の状態で、吸収体は、その厚みが3.0mmであり、凹部44(44X,44Y)は、その深さが0.5mmであり、該深さが吸収体の厚みの17%であった。
また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが8.8mmであり、凹部44(44X,44Y)は、その深さが5.0mmであり、該深さが吸収体の厚みの57%であった。 [Example 5]
Example 1 except that the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the
Specifically, in the
Further, the
Further, in the state before liquid absorption, the absorber has a thickness of 3.0 mm, and the recess 44 (44X, 44Y) has a depth of 0.5 mm, which is the thickness of the absorber. 17%.
Further, in the state after liquid absorption (state after 5 minutes have passed after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 ), the absorber has a thickness of 8.8 mm, and has a recess 44 ( 44X, 44Y) had a depth of 5.0 mm, which was 57% of the thickness of the absorber.
第3領域を有しており、吸収体の第2領域4Sにおける吸水性ポリマーと親水性繊維との重量比を変更する以外は、実施例1と同様にして、実施例6の吸収体を作製した。吸水性ポリマーとしては、実施例1と同様に、吸水性ポリマーAを用いた。
具体的には、吸収体の第2領域4Sは、乾燥状態で、吸水性ポリマーの重量(坪量)が170g/m2であり、親水性繊維の重量(坪量)が90g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.89であった。
また、吸収体の第3領域4Tは、乾燥状態で、吸水性ポリマーの重量(坪量)が10g/m2であり、親水性繊維の重量(坪量)が60g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が0.17であった。
また、液吸収前の状態で、吸収体は、その厚みが5.2mmであり、凹部44(44X,44Y)は、その深さが3.7mmであり、該深さが吸収体の厚みの71%であった。
また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが9.2mmであり、凹部44(44X,44Y)は、その深さが6.7mmであり、該深さが吸収体の厚みの73%であった。 [Example 6]
The absorbent body of Example 6 is manufactured in the same manner as in Example 1 except that the third area is included and the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the
Specifically, the
The
In the state before liquid absorption, the absorber has a thickness of 5.2 mm, and the recess 44 (44X, 44Y) has a depth of 3.7 mm, which is the thickness of the absorber. It was 71%.
Further, in the state after liquid absorption (state in which a 0.9 wt% sodium chloride aqueous solution is supplied at 2000 g / m 2 and after 5 minutes have elapsed), the absorber has a thickness of 9.2 mm and has a recess 44 ( 44X, 44Y) had a depth of 6.7 mm, and the depth was 73% of the thickness of the absorber.
図7に示す装置を用いて図10,図11に示す吸収体を作製した。尚、作製した吸収体は、第3領域を有していない吸収体である。
吸水性ポリマーとしては吸水性ポリマーAを用い、親水性繊維としては開繊したパルプ(フラッフパルプ)を用いた。作製した吸収体について、以下、具体的に説明する。
吸収体の第1領域4Fは、乾燥状態で、吸水性ポリマーの重量(坪量)が100g/m2であり、親水性繊維の重量(坪量)が80g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.25であった。
また、吸収体の第2領域4Sは、乾燥状態で、吸水性ポリマーの重量(坪量)が200g/m2であり、親水性繊維の重量(坪量)が150g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.3であった。 [Example 7]
The absorber shown in FIG. 10, FIG. 11 was produced using the apparatus shown in FIG. In addition, the produced absorber is an absorber which does not have a 3rd area | region.
Water-absorbing polymer A was used as the water-absorbing polymer, and opened pulp (fluff pulp) was used as the hydrophilic fiber. The produced absorber will be specifically described below.
In the
Further, the
液吸収前の状態で、複数の凹部44からなる列44Bは、横方向(X方向)に隣り合う列44Bどうしの間隔L5が20mmであり、縦方向(Y方向)に隣り合う列44Bどうしの間隔L8が30mmであった。また、液吸収前の状態で、各凹部44は、その横方向(X方向)の長さL6が20mmであり、その縦方向(Y方向)の長さL7が100mmであった。
また、乾燥状態で、凹部44(44X,44Y)の坪量は180g/m2であり、凸部43の坪量は530g/m2であった。
また、液吸収前の状態で、吸収体は、その厚みが5.5mmであり、凹部44(44X,44Y)は、その深さが3.2mmであり、該深さが吸収体の厚みの58%であった。
また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが8.5mmであり、凹部44(44X,44Y)は、その深さが5.8mmであり、該深さが吸収体の厚みの68%であった。 The absorber (block-shaped region) had a total length of 380 mm and a total width of 120 mm before liquid absorption.
In the state before the liquid absorption, the
Moreover, the basic weight of the recessed part 44 (44X, 44Y) was 180 g / m < 2 > in the dry state, and the basic weight of the
Further, in the state before liquid absorption, the absorber has a thickness of 5.5 mm, and the recess 44 (44X, 44Y) has a depth of 3.2 mm, which is the thickness of the absorber. 58%.
Further, in the state after liquid absorption (state after 5 minutes have passed after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 ), the absorber has a thickness of 8.5 mm, and has a recess 44 ( 44X, 44Y) had a depth of 5.8 mm, and the depth was 68% of the thickness of the absorber.
吸収体の第1領域4Fにおける吸水性ポリマーと親水性繊維との重量比、及び吸収体の第2領域4Sにおける吸水性ポリマーと親水性繊維との重量比を変更する以外は、実施例7と同様にして、実施例8の吸収体を作製した。吸水性ポリマーとしては、実施例7と同様に、吸水性ポリマーAを用いた。
具体的には、吸収体の第1領域4Fは、乾燥状態で、吸水性ポリマーの重量(坪量)が125g/m2であり、親水性繊維の重量(坪量)が100g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.25であった。
また、吸収体の第2領域4Sは、乾燥状態で、吸水性ポリマーの重量(坪量)が160g/m2であり、親水性繊維の重量(坪量)が125g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.28であった。
液吸収前の状態で、吸収体は、その厚みが3.5mmであり、凹部44(44X,44Y)は、その深さが0.5mmであり、該深さが吸収体の厚みの14%であった。
また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが7.8mmであり、凹部44(44X,44Y)は、その深さが4.5mmであり、該深さが吸収体の厚みの58%であった。 [Example 8]
Example 7 with the exception of changing the weight ratio of the water-absorbing polymer and hydrophilic fibers in the
Specifically, the
Further, the
In a state before liquid absorption, the absorber has a thickness of 3.5 mm, and the recess 44 (44X, 44Y) has a depth of 0.5 mm, which is 14% of the thickness of the absorber. Met.
Moreover, in the state after liquid absorption (state after supply of 2,000 g / m 2 of 0.9% by weight sodium chloride aqueous solution for 5 minutes), the absorber has a thickness of 7.8 mm, and the recess 44 ( 44X, 44Y) had a depth of 4.5 mm, which was 58% of the thickness of the absorber.
第3領域を有しており、吸収体の第2領域4Sにおける吸水性ポリマーと親水性繊維との重量比を変更する以外は、実施例7と同様にして、実施例9の吸収体を作製した。吸水性ポリマーとしては、実施例7と同様に、吸水性ポリマーAを用いた。
具体的には、吸収体の第2領域4Sは、乾燥状態で、吸水性ポリマーの重量(坪量)が190g/m2であり、親水性繊維の重量(坪量)が90g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が2.11であった。
また、吸収体の第3領域4Tは、乾燥状態で、吸水性ポリマーの重量(坪量)が10g/m2であり、親水性繊維の重量(坪量)が60g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が0.17であった。
また、液吸収前の状態で、吸収体は、その厚みが5.5mmであり、凹部44(44X,44Y)は、その深さが3.2mmであり、該深さが吸収体の厚みの58%であった。 また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが8.3mmであり、凹部44(44X,44Y)は、その深さが5.6mmであり、該深さが吸収体の厚みの67%であった。 [Example 9]
The absorbent body of Example 9 is manufactured in the same manner as in Example 7, except that the third area is included and the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the
Specifically, in the
The
Further, in the state before liquid absorption, the absorber has a thickness of 5.5 mm, and the recess 44 (44X, 44Y) has a depth of 3.2 mm, which is the thickness of the absorber. 58%. Moreover, in the state after liquid absorption (state after supply of 0.9 g% sodium chloride aqueous solution of 2000 g / m 2 for 5 minutes), the absorber has a thickness of 8.3 mm, and the recess 44 ( 44X, 44Y) had a depth of 5.6 mm, and the depth was 67% of the thickness of the absorber.
吸収体の第1領域4Fにおける吸水性ポリマーと親水性繊維との重量比、及び吸収体の第2領域4Sにおける吸水性ポリマーと親水性繊維との重量比を変更する以外は、実施例1と同様にして、比較例1の吸収体を作製した。吸水性ポリマーとしては、実施例1と同様に、吸水性ポリマーAを用いた。
具体的には、吸収体の第1領域4Fは、乾燥状態で、吸水性ポリマーの重量(坪量)が150g/m2であり、親水性繊維の重量(坪量)が50g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が3.0であった。
また、吸収体の第2領域4Sは、乾燥状態で、吸水性ポリマーの重量(坪量)が80g/m2であり、親水性繊維の重量(坪量)が150g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が0.53であった。
また、液吸収前の状態で、吸収体は、その厚みが4.2mmであり、凹部は、その深さが2.0mmであり、該深さが吸収体の厚みの48%であった。
また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが8.5mmであり、凹部は、その深さが1.5mmであり、該深さが吸収体の厚みの18%であった。凹部は、第2領域を貫通していなかった。 [Comparative Example 1]
Example 1 except that the weight ratio between the water-absorbing polymer and the hydrophilic fiber in the
Specifically, in the
Further, the
In the state before liquid absorption, the absorber had a thickness of 4.2 mm, and the recess had a depth of 2.0 mm, and the depth was 48% of the thickness of the absorber.
Further, in the state after liquid absorption (state after 5 minutes have passed after supplying a 0.9 wt% sodium chloride aqueous solution at 2000 g / m 2 ), the absorber has a thickness of 8.5 mm, The depth was 1.5 mm, and the depth was 18% of the thickness of the absorber. The concave portion did not penetrate the second region.
吸収体の第1領域4Fにおける吸水性ポリマーと親水性繊維との重量比、及び吸収体の第2領域4Sにおける吸水性ポリマーと親水性繊維との重量比を変更し、吸収体の厚み及び凹部の深さを変更する以外は、実施例1と同様にして、比較例2の吸収体を作製した。吸水性ポリマーとしては、実施例1と同様に、吸水性ポリマーAを用いた。
具体的には、吸収体の第1領域4Fは、乾燥状態で、吸水性ポリマーの重量(坪量)が80g/m2であり、親水性繊維の重量(坪量)が50g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.6であった。
また、吸収体の第2領域4Sは、乾燥状態で、吸水性ポリマーの重量(坪量)が120g/m2であり、親水性繊維の重量(坪量)が100g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1.2であった。
また、液吸収前の状態で、吸収体は、その厚みが3.5mmであり、凹部は、その深さが0.5mmであり、該深さが吸収体の厚みの14%であった。
また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが7.0mmであり、凹部は、その深さが1.0mmであり、該深さが吸収体の厚みの14%であった。凹部は、第2領域を貫通していなかった。 [Comparative Example 2]
By changing the weight ratio of the water-absorbing polymer and the hydrophilic fiber in the
Specifically, in the
Further, the
In the state before liquid absorption, the absorber had a thickness of 3.5 mm, and the recess had a depth of 0.5 mm, and the depth was 14% of the thickness of the absorber.
Further, in the state after liquid absorption (state after supply of 2,000 g / m 2 of 0.9 wt% sodium chloride aqueous solution for 5 minutes), the absorber has a thickness of 7.0 mm, The depth was 1.0 mm, and the depth was 14% of the thickness of the absorber. The concave portion did not penetrate the second region.
吸収体の第1領域4Fにおける吸水性ポリマーと親水性繊維との重量比、及び吸収体の第2領域4Sにおける吸水性ポリマーと親水性繊維との重量比を変更する以外は、実施例7と同様にして、比較例3の吸収体を作製した。吸水性ポリマーとしては、実施例7と同様に、吸水性ポリマーAを用いた。
具体的には、吸収体の第1領域4Fは、乾燥状態で、吸水性ポリマーの重量(坪量)が160g/m2であり、親水性繊維の重量(坪量)が80g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が2.0であった。
また、吸収体の第2領域4Sは、乾燥状態で、吸水性ポリマーの重量(坪量)が100g/m2であり、親水性繊維の重量(坪量)が150g/m2であり、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が0.67であった。
また、液吸収前の状態で、吸収体は、その厚みが5.5mmであり、凹部は、その深さが2.2mmであり、該深さが吸収体の厚みの40%であった。
また、液吸収後の状態(0.9重量%の塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態)で、吸収体は、その厚みが7.2mmであり、凹部は、その深さが1.4mmであり、該深さが吸収体の厚みの19%であった。凹部は、第2領域を貫通していなかった。 [Comparative Example 3]
Example 7 with the exception of changing the weight ratio of the water-absorbing polymer and hydrophilic fibers in the
Specifically, in the
Further, the
Further, in the state before liquid absorption, the absorber had a thickness of 5.5 mm, and the recess had a depth of 2.2 mm, and the depth was 40% of the thickness of the absorber.
Further, in the state after liquid absorption (the state after supplying 0.9 g% sodium chloride aqueous solution at 2000 g / m 2 and after 5 minutes), the absorbent body has a thickness of 7.2 mm, The depth was 1.4 mm, and the depth was 19% of the thickness of the absorber. The concave portion did not penetrate the second region.
実施例1~9、比較例1~3の吸収体に関し、下記方法に従って吸収性物品を作製し、液の拡散性、液戻り性について評価した。評価環境は室温20℃、湿度60%RHであった。それらの結果を下記表1に示す。
〔吸収性物品の作製〕
実施例1~9、比較例1~3の吸収体を、ホットメルト剤を塗布した坪量16g/m2のティッシュペーパーで包み、アイロンでホットメルト剤を溶融し、吸収体とティッシュペーパーを接合した。これを表面シートと裏面シートの間に配置し(凹部を裏面シート側に)、吸収性物品を得た。肌当接面である表面シートには、花王(株)製の商品名メリーズの表面材を用い、液不透過性の裏面シートには、花王(株)製の商品名メリーズのバックシートを用いた。 [Performance evaluation]
With respect to the absorbers of Examples 1 to 9 and Comparative Examples 1 to 3, absorbent articles were prepared according to the following methods, and liquid diffusibility and liquid return properties were evaluated. The evaluation environment was a room temperature of 20 ° C. and a humidity of 60% RH. The results are shown in Table 1 below.
[Production of absorbent articles]
The absorbers of Examples 1 to 9 and Comparative Examples 1 to 3 are wrapped in tissue paper having a basis weight of 16 g / m 2 coated with a hot melt agent, the hot melt agent is melted with an iron, and the absorber and tissue paper are joined. did. This was arrange | positioned between the surface sheet and the back surface sheet (a recessed part is on the back surface sheet side), and the absorbent article was obtained. For the top sheet that is the skin contact surface, use the surface material of the brand name Marys manufactured by Kao Co., Ltd. For the liquid-impermeable back sheet, use the back sheet of the brand name of Kao Co., Ltd. It was.
実施例1~9、比較例1~2の吸収体を用いて作製した吸収性物品を、水平に置いたガラス製の表面平滑なプレート上に配置した。各吸収体の縦方向前端部から200mm、幅方向中央部に、内径35mmの円筒を置き、0.9重量%の塩化ナトリウム水溶液40gを高さ10mmになるように液を維持しながら注入した。吸収開始から10分後に、再度40gを注入するというサイクルで、同様の操作を計4回繰り返し、合計120gの塩化ナトリウム水溶液を吸収させた。4回目の注入開始から10分後に、吸収体の液拡散面積を測定し、これを下記の規準に従い液拡散性の評価をした。
A:吸収体の液拡散面積が270cm2以上
B:吸収体の液拡散面積が250cm2以上270cm2未満
C:吸収体の液拡散面積が250cm2未満 (Evaluation of liquid diffusibility)
Absorbent articles produced using the absorbers of Examples 1 to 9 and Comparative Examples 1 and 2 were placed on a flat glass plate placed horizontally. A cylinder with an inner diameter of 35 mm was placed 200 mm from the longitudinal front end of each absorber and in the center in the width direction. The same operation was repeated 4 times in a cycle of injecting 40 g again 10 minutes after the start of absorption, and a total of 120 g of sodium chloride aqueous solution was absorbed. Ten minutes after the start of the fourth injection, the liquid diffusion area of the absorber was measured, and the liquid diffusibility was evaluated according to the following criteria.
A: Liquid diffusion area of the absorber is 270 cm 2 or more B: Liquid diffusion area of the absorber is 250 cm 2 or more and less than 270 cm 2 C: Liquid diffusion area of the absorber is less than 250 cm 2
新たに実施例1~9、比較例1~2の吸収体を用いて作製した吸収性物品を、水平に置いたガラス製の表面平滑なプレート上に配置した。各吸収性物品の縦方向前端部から150mm、幅方向中央部に、内径35mmの円筒を置き、吸収性物品全体に2.0kPaの荷重を加えながら、0.9重量%の塩化ナトリウム水溶液40gを高さ10mmになるように液を維持しながら注入した。吸収開始から10分後に、再度40gを注入するというサイクルで、同様の操作を計4回繰り返し、合計160gの塩化ナトリウム水溶液を吸収させた。予め、東洋ろ紙(アドヴァンテックNo.4A)を100mm×100mmに切断し、10枚重ねにしたものを準備し(重量W1)、4回目の注入開始から10分後に、注入点を中心として吸収体上に載せ、厚さ5mm、100mm×100mmのアクリル板を介して、3.5kPaの圧力を掛け、2分後にろ紙の重量(W2)を測定し、次式により液戻り量を算出し、これを下記の規準に従い液戻り性の評価をした。
液戻り量(g)=加圧後のろ紙の重量(W2)-最初のろ紙の重量(W1)
A:液戻り量が0.2g未満
B:液戻り量が0.2g以上1.0g未満
C:液戻り量が1.0g以上1.5g未満
D:液戻り量が1.5g以上 [Evaluation of liquid returnability]
The absorbent articles newly prepared using the absorbers of Examples 1 to 9 and Comparative Examples 1 and 2 were placed on a flat glass plate placed horizontally. Place a cylinder with an inner diameter of 35 mm at the center in the width direction at 150 mm from the longitudinal front end of each absorbent article, and apply a 0.9 g sodium chloride aqueous solution 40 g while applying a 2.0 kPa load to the entire absorbent article. The liquid was injected while maintaining the liquid so that the height was 10 mm. A similar operation was repeated four times in a cycle of injecting 40 g again 10 minutes after the start of absorption, and a total of 160 g of sodium chloride aqueous solution was absorbed. Prepare an oriental filter paper (Advantech No. 4A) cut to 100 mm x 100 mm and put 10 sheets on top (weight W1) 10 minutes after the start of the fourth injection, the absorbent centering on the injection point Place it on top, apply a pressure of 3.5 kPa through an acrylic plate with a thickness of 5 mm, 100 mm x 100 mm, measure the weight (W2) of the filter paper after 2 minutes, and calculate the liquid return amount by the following formula. The liquid returnability was evaluated according to the following criteria.
Liquid return amount (g) = weight of filter paper after pressurization (W2) −weight of first filter paper (W1)
A: Liquid return amount is less than 0.2 g B: Liquid return amount is 0.2 g or more and less than 1.0 g C: Liquid return amount is 1.0 g or more and less than 1.5 g D: Liquid return amount is 1.5 g or more
前述の液戻り性評価の試験において、4回目の吸収に要した時間を測定し、これを下記規準に従い吸収時間の評価をした。なお、吸収時間の評価としては、時間が短いほど性能が良好であることを示している。
A:吸収時間が80秒未満
B:吸収時間が80秒以上120秒未満
C:吸収時間が120秒以上180秒未満
D:吸収時間が180秒以上 [Evaluation of absorption time]
In the above-described liquid return evaluation test, the time required for the fourth absorption was measured, and the absorption time was evaluated according to the following criteria. In addition, as evaluation of absorption time, it has shown that performance is so favorable that time is short.
A: Absorption time of less than 80 seconds B: Absorption time of 80 seconds to less than 120 seconds C: Absorption time of 120 seconds to less than 180 seconds D: Absorption time of 180 seconds or more
Claims (18)
- 吸水性ポリマーと親水性繊維とを含む吸収体であって、
吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1以上である第1領域と、
該第1領域よりも吸水性ポリマー及び親水性繊維それぞれの含有量が多い第2領域とを有し、
前記第1領域及び前記第2領域は、厚み方向に連続して配されており、
0.9重量%の塩化ナトリウム水塩化ナトリウム水溶液を2000g/m2供給して5分経過後の状態において、前記第2領域を厚み方向に貫通する凹部が形成されている吸収体。 An absorbent body comprising a water-absorbing polymer and hydrophilic fibers,
A first region in which a weight ratio of the water-absorbing polymer to the hydrophilic fiber (weight of the water-absorbing polymer / weight of the hydrophilic fiber) is 1 or more;
A second region having a higher content of each of the water-absorbing polymer and the hydrophilic fiber than the first region,
The first region and the second region are continuously arranged in the thickness direction,
An absorbent body in which a concave portion penetrating through the second region in the thickness direction is formed after a lapse of 5 minutes after supplying a 0.9 wt% sodium chloride aqueous sodium chloride solution at a rate of 2000 g / m 2 . - 前記塩化ナトリウム水塩化ナトリウム水溶液を供給する前の状態において、前記第2領域を厚み方向に貫通する凹部が形成されている請求項1に記載の吸収体。 The absorbent body according to claim 1, wherein a concave portion penetrating the second region in the thickness direction is formed in a state before the sodium chloride aqueous sodium chloride solution is supplied.
- 前記第2領域は、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が1以上である請求項1又は2に記載の吸収体。 The absorbent body according to claim 1 or 2, wherein the second region has a weight ratio of the water-absorbing polymer to the hydrophilic fiber (weight of the water-absorbing polymer / weight of the hydrophilic fiber) of 1 or more.
- 前記凹部は、液吸収前の状態で、その深さが前記吸収体の厚みの20%以上100%以下である請求項1~3の何れか1項に記載の吸収体。 The absorbent body according to any one of claims 1 to 3, wherein the depth of the concave portion is 20% or more and 100% or less of the thickness of the absorbent body in a state before liquid absorption.
- 前記第1領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の比(第2領域/第1領域)は、好ましくは1.6倍以上、より好ましくは2.0倍以上、更に好ましくは2.1倍以上である請求項1~4の何れか1項に記載の吸収性物品。 The ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the first region (second region / first region) is preferably 1.6 times or more, more preferably 2.0. The absorbent article according to any one of claims 1 to 4, wherein the absorbent article is twice or more, more preferably 2.1 times or more.
- 前記第1領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の比(第2領域/第1領域)は、好ましくは2.5倍以下、より好ましくは2.3倍以下、更に好ましくは2.25倍以下である請求項1~5の何れか1項に記載の吸収性物品。 The ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the first region (second region / first region) is preferably 2.5 times or less, more preferably 2.3. The absorbent article according to any one of claims 1 to 5, wherein the absorbent article is 2 times or less, more preferably 2.25 times or less.
- 前記吸水性ポリマーは、その吸水量が30g/g以上50g/g以下であり、2.0kPaでの加圧下吸収量が20g/g以上40g/g以下であり、2.0kPaでの加圧下通液速度が1ml/min未満であり、DW法に従い測定された吸収速度が40ml/(g・10分)以上60ml/(g・10分)以下である請求項1~6の何れか1項に記載の吸収体。 The water-absorbing polymer has a water absorption amount of 30 g / g or more and 50 g / g or less, an absorption amount under pressure at 2.0 kPa of 20 g / g or more and 40 g / g or less, and a pressure reduction under 2.0 kPa. The liquid velocity is less than 1 ml / min, and the absorption rate measured according to the DW method is 40 ml / (g · 10 minutes) or more and 60 ml / (g · 10 minutes) or less. The absorber of description.
- 前記吸水性ポリマーは、DW法に従い測定された吸収速度が5ml/(g・1分)以上13ml/(g・1分)以下である請求項1~7の何れか1項に記載の吸収体。 The absorbent according to any one of claims 1 to 7, wherein the water-absorbing polymer has an absorption rate measured according to a DW method of 5 ml / (g · 1 minute) to 13 ml / (g · 1 minute). .
- 前記吸収体は、液吸収前の状態で、その厚みが0.5mm以上20mm以下である請求項1~8の何れか1項に記載の吸収体。 The absorber according to any one of claims 1 to 8, wherein the absorber has a thickness of 0.5 mm or more and 20 mm or less before liquid absorption.
- 該第2領域よりも吸水性ポリマー及び親水性繊維それぞれの含有量が少なく、吸水性ポリマーと親水性繊維との重量比(吸水性ポリマーの重量/親水性繊維の重量)が0.5以下である第3領域を有し、
前記第1領域、前記第2領域及び前記第3領域は、厚み方向に連続して配されており、
前記凹部は、前記第2領域及び前記第3領域を厚み方向に貫通している請求項1~9の何れか1項に記載の吸収体。 The content of each of the water-absorbing polymer and the hydrophilic fiber is less than that in the second region, and the weight ratio of the water-absorbing polymer to the hydrophilic fiber (weight of the water-absorbing polymer / weight of the hydrophilic fiber) is 0.5 or less. Having a third region,
The first region, the second region, and the third region are continuously arranged in the thickness direction,
The absorber according to any one of claims 1 to 9, wherein the recess penetrates the second region and the third region in the thickness direction. - 前記第1領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の差(第2領域-第1領域)は、好ましくは45g/cm2以上、より好ましくは70g/cm2以上、更に好ましくは90g/cm2以上である請求項1~10の何れか1項に記載の吸収性物品。 The difference in the basis weight of the water-absorbing polymer in the second region with respect to the basis weight of the water-absorbing polymer in the first region (second region-first region) is preferably 45 g / cm 2 or more, more preferably 70 g / cm. The absorbent article according to any one of claims 1 to 10, which is 2 or more, more preferably 90 g / cm 2 or more.
- 前記第1領域の吸水性ポリマーの坪量に対する前記第2領域の吸水性ポリマーの坪量の比(第2領域-第1領域)は、好ましくは150g/cm2以下、より好ましくは120g/cm2以下、更に好ましくは100g/cm2以下である請求項1~11の何れか1項に記載の吸収性物品。 The ratio of the basis weight of the water absorbent polymer in the second region to the basis weight of the water absorbent polymer in the first region (second region-first region) is preferably 150 g / cm 2 or less, more preferably 120 g / cm 2. The absorbent article according to any one of claims 1 to 11, which is 2 or less, more preferably 100 g / cm 2 or less.
- 肌対向面側に配された表面シートと、非肌対向面側に配された裏面シートと、これら両シート間に配された、請求項1~12の何れか1項に記載の吸収体とを備えた吸収性物品。 The top sheet disposed on the skin facing surface side, the back sheet disposed on the non-skin facing surface side, and the absorbent body according to any one of claims 1 to 12, disposed between the two sheets. Absorbent article comprising
- 前記第2領域は、前記第1領域の肌対向面側に配されており、
前記凹部は、前記表面シート側から前記裏面シート側に凹んでいる請求項13に記載の吸収性物品。 The second region is arranged on the skin facing surface side of the first region,
The absorbent article according to claim 13, wherein the recess is recessed from the top sheet side to the back sheet side. - 前記第2領域は、前記第1領域の非肌対向面側に配されており、
前記凹部は、前記裏面シート側から前記表面シート側に凹んでいる請求項13に記載の吸収性物品。 The second region is arranged on the non-skin facing surface side of the first region,
The absorbent article according to claim 13, wherein the recess is recessed from the back sheet side to the top sheet side. - 前記吸収体と前記表面シートとの間に親水性の中間シートが配されている請求項13~15の何れか1項に記載の吸収性物品。 The absorbent article according to any one of claims 13 to 15, wherein a hydrophilic intermediate sheet is disposed between the absorber and the top sheet.
- 前記吸収体と前記裏面シートとの間に親水性の中間シートが配されている請求項13~16の何れか1項に記載の吸収性物品。 The absorbent article according to any one of claims 13 to 16, wherein a hydrophilic intermediate sheet is disposed between the absorber and the back sheet.
- 前記吸収体の前記凹部と前記中間シートとにより空間が形成されている請求項16又は17に記載の吸収性物品。 The absorbent article according to claim 16 or 17, wherein a space is formed by the concave portion of the absorber and the intermediate sheet.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2014153100/12A RU2600437C2 (en) | 2012-06-11 | 2013-06-10 | Absorbent element and absorbent article obtained using said absorbent element |
CN201380019794.XA CN104244889B (en) | 2012-06-11 | 2013-06-10 | Absorber and use its absorbent commodity |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-131847 | 2012-06-11 | ||
JP2012131847 | 2012-06-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013187375A1 true WO2013187375A1 (en) | 2013-12-19 |
Family
ID=49758197
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/065985 WO2013187375A1 (en) | 2012-06-11 | 2013-06-10 | Absorbent and absorbent article obtained using same |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP6231779B2 (en) |
CN (1) | CN104244889B (en) |
RU (1) | RU2600437C2 (en) |
WO (1) | WO2013187375A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3527183A1 (en) * | 2018-02-18 | 2019-08-21 | Ontex BVBA | Absorbent core, articles comprising said core, and methods of making |
EP3527184A1 (en) * | 2018-02-18 | 2019-08-21 | Ontex BVBA | Absorbent core, articles comprising said core, and methods of making |
US20200289343A1 (en) * | 2017-11-28 | 2020-09-17 | Kao Corporation | Absorbent body and absorbent article |
EP3738563A4 (en) * | 2018-01-10 | 2021-03-10 | Unicharm Corporation | Absorbent article |
US20210322232A1 (en) * | 2018-07-19 | 2021-10-21 | Twe Meulebeke | Multi-layered non-woven structure for use as a component of disposable absorbent articles |
EP4014938A4 (en) * | 2019-09-30 | 2022-09-28 | Unicharm Corporation | Absorbent article |
EP4201385A4 (en) * | 2020-09-29 | 2024-02-21 | Unicharm Corporation | Absorbent article |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015163130A (en) * | 2014-02-28 | 2015-09-10 | 日本製紙クレシア株式会社 | Absorbent article and manufacturing method of the same |
BR112017013115A2 (en) * | 2014-12-18 | 2018-01-02 | Kao Corp | absorbent article, absorbent article manufacturing method, and absorbent article manufacturing device |
JP5965979B2 (en) * | 2014-12-18 | 2016-08-10 | 花王株式会社 | Absorber manufacturing equipment |
JP5969104B2 (en) * | 2014-12-18 | 2016-08-10 | 花王株式会社 | Absorber manufacturing method |
WO2016118405A1 (en) * | 2015-01-23 | 2016-07-28 | Kimberly-Clark Worldwide, Inc. | Bridged absorbent structure |
JP6001713B2 (en) * | 2015-03-16 | 2016-10-05 | 大王製紙株式会社 | Absorbent articles |
JP6185033B2 (en) * | 2015-09-30 | 2017-08-23 | ユニ・チャーム株式会社 | Absorber for absorbent articles |
JP6812153B2 (en) * | 2016-07-19 | 2021-01-13 | 花王株式会社 | Absorber manufacturing equipment and absorber manufacturing method |
CN112334517B (en) * | 2018-07-19 | 2023-10-24 | 三大雅株式会社 | Water-absorbent resin particles, absorbent body comprising same, and absorbent article |
US20220023111A1 (en) * | 2018-12-12 | 2022-01-27 | Sumitomo Seika Chemicals Co., Ltd. | Absorbent resin particles, absorbent article and production method therefor |
JP6832024B1 (en) * | 2020-01-10 | 2021-02-24 | Dsgジャパン株式会社 | Absorbents and disposable diapers |
WO2022255301A1 (en) * | 2021-05-31 | 2022-12-08 | 住友精化株式会社 | Absorbent article |
WO2022255302A1 (en) * | 2021-05-31 | 2022-12-08 | 住友精化株式会社 | Water absorbent sheet and absorbent article |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002172139A (en) * | 2000-12-08 | 2002-06-18 | Daio Paper Corp | Absorber, method for manufacturing the same, and adsorptive article having this absorber |
JP2009119154A (en) * | 2007-11-16 | 2009-06-04 | Uni Charm Corp | Absorbent article |
JP2011019896A (en) * | 2009-06-17 | 2011-02-03 | Kao Corp | Absorbent article |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19609462A1 (en) * | 1996-03-11 | 1997-09-18 | Kimberly Clark Gmbh | Absorbent article and method for the directed discharge of locally escaping fluids |
JP3406214B2 (en) * | 1998-01-30 | 2003-05-12 | ユニ・チャーム株式会社 | Disposable diapers |
JP4309594B2 (en) * | 2001-01-15 | 2009-08-05 | 大王製紙株式会社 | Disposable diapers |
CN1284518C (en) * | 2002-09-30 | 2006-11-15 | 大王制纸株式会社 | Body fluid absorbent article |
JP5513105B2 (en) * | 2009-12-28 | 2014-06-04 | 花王株式会社 | Absorbent articles |
-
2013
- 2013-06-10 WO PCT/JP2013/065985 patent/WO2013187375A1/en active Application Filing
- 2013-06-10 CN CN201380019794.XA patent/CN104244889B/en active Active
- 2013-06-10 RU RU2014153100/12A patent/RU2600437C2/en active
- 2013-06-10 JP JP2013121957A patent/JP6231779B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002172139A (en) * | 2000-12-08 | 2002-06-18 | Daio Paper Corp | Absorber, method for manufacturing the same, and adsorptive article having this absorber |
JP2009119154A (en) * | 2007-11-16 | 2009-06-04 | Uni Charm Corp | Absorbent article |
JP2011019896A (en) * | 2009-06-17 | 2011-02-03 | Kao Corp | Absorbent article |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20200289343A1 (en) * | 2017-11-28 | 2020-09-17 | Kao Corporation | Absorbent body and absorbent article |
EP3677235A4 (en) * | 2017-11-28 | 2021-08-18 | Kao Corporation | Absorbent body and absorbent article |
US11969327B2 (en) | 2018-01-10 | 2024-04-30 | Unicharm Corporation | Absorbent article |
EP3738563A4 (en) * | 2018-01-10 | 2021-03-10 | Unicharm Corporation | Absorbent article |
WO2019158239A1 (en) * | 2018-02-18 | 2019-08-22 | Ontex Bvba | Absorbent core and absorbent articles comprising said core |
US20200397631A1 (en) * | 2018-02-18 | 2020-12-24 | Ontex Bv | Absorbent core and absorbent articles comprising said core |
EP3527183A1 (en) * | 2018-02-18 | 2019-08-21 | Ontex BVBA | Absorbent core, articles comprising said core, and methods of making |
WO2019158238A1 (en) * | 2018-02-18 | 2019-08-22 | Ontex Bvba | Absorbent core and absorbent articles comprising said core |
EP3527184A1 (en) * | 2018-02-18 | 2019-08-21 | Ontex BVBA | Absorbent core, articles comprising said core, and methods of making |
US11998433B2 (en) | 2018-02-18 | 2024-06-04 | Ontex Bv | Absorbent core and absorbent articles comprising said core |
US20210322232A1 (en) * | 2018-07-19 | 2021-10-21 | Twe Meulebeke | Multi-layered non-woven structure for use as a component of disposable absorbent articles |
EP4014938A4 (en) * | 2019-09-30 | 2022-09-28 | Unicharm Corporation | Absorbent article |
EP4201385A4 (en) * | 2020-09-29 | 2024-02-21 | Unicharm Corporation | Absorbent article |
Also Published As
Publication number | Publication date |
---|---|
RU2600437C2 (en) | 2016-10-20 |
CN104244889A (en) | 2014-12-24 |
RU2014153100A (en) | 2016-07-27 |
CN104244889B (en) | 2017-03-01 |
JP2014014666A (en) | 2014-01-30 |
JP6231779B2 (en) | 2017-11-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6231779B2 (en) | Absorber and absorbent article using the same | |
US7396584B2 (en) | Crosslinked polyamine coating on superabsorbent hydrogels | |
CN107496080B (en) | Absorbent core with high content of superabsorbent material | |
JP5571215B2 (en) | Method for producing absorbent composite | |
KR101601990B1 (en) | Absorbent articles comprising absorbent materials exhibiting deswell/reswell | |
EP1448242A1 (en) | Crosslinked polyamine coating on superabsorbent hydrogels | |
JP2009072421A (en) | Absorbent article | |
JP6515245B2 (en) | Absorbent body and absorbent article | |
US20210298962A1 (en) | Feminine hygiene absorbent article | |
JP2009072420A (en) | Absorbent article | |
JP2009061063A (en) | Absorbent article | |
JP2021532865A (en) | Fluid absorbent core | |
EP4306092A1 (en) | Absorber | |
JP4808011B2 (en) | Body fluid absorbent article with excellent diffusivity | |
JP2011000231A (en) | Absorber and absorbent article | |
JP5878431B2 (en) | Absorber and absorbent article | |
JP4868832B2 (en) | Body fluid absorbent article | |
EP4349312A1 (en) | Absorbent article | |
JP2007044118A (en) | Disposable body fluid absorbent article | |
JP5117841B2 (en) | Absorbent articles | |
WO2022255302A1 (en) | Water absorbent sheet and absorbent article | |
JP4868831B2 (en) | High absorption performance body fluid absorbent article | |
JPH10337305A (en) | Absorption body and absorption product | |
JP2007044117A (en) | Disposable body fluid absorbent article |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13804258 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: IDP00201406126 Country of ref document: ID |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2014153100 Country of ref document: RU Kind code of ref document: A |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 13804258 Country of ref document: EP Kind code of ref document: A1 |