CN111374833A - Absorbent body and absorbent article - Google Patents

Absorbent body and absorbent article Download PDF

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Publication number
CN111374833A
CN111374833A CN201811633255.6A CN201811633255A CN111374833A CN 111374833 A CN111374833 A CN 111374833A CN 201811633255 A CN201811633255 A CN 201811633255A CN 111374833 A CN111374833 A CN 111374833A
Authority
CN
China
Prior art keywords
absorbent
water
absorbent body
width direction
longitudinal direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811633255.6A
Other languages
Chinese (zh)
Inventor
川上祐介
高居义
丹下悟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unicharm Corp
Original Assignee
Unicharm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unicharm Corp filed Critical Unicharm Corp
Priority to CN201811633255.6A priority Critical patent/CN111374833A/en
Priority to JP2019223253A priority patent/JP2020108747A/en
Publication of CN111374833A publication Critical patent/CN111374833A/en
Pending legal-status Critical Current

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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
    • 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
    • A61F13/535—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 inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • 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
    • A61F13/53409—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 having a folded core
    • A61F13/53436—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 having a folded core having an undulated or corrugated cross-section
    • 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
    • A61F13/537—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F13/5376—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the performance of the layer, e.g. acquisition rate, distribution time, transfer time
    • 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
    • A61F13/535—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 inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • A61F2013/5355—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 inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes with terraced core
    • 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
    • A61F13/537—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F2013/53765—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry
    • A61F2013/53786—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry with folds

Abstract

The invention provides an absorbent body and an absorbent article. The invention provides an absorbent body which is good in fitting property to a crotch part and excellent in wearing feeling when the absorbent body is arranged on an absorbent article and worn. The invention provides an absorbent (14) having an absorbent core and core wrap sheets provided on both surfaces thereof, wherein the absorbent core is a laminated absorbent core in which at least a 1 st water-absorbing material (45) and a 2 nd water-absorbing material (47) are laminated in this order, at least one of the 1 st water-absorbing material (45) and the 2 nd water-absorbing material (47) contains a super absorbent polymer in an amount of 90 mass% or more relative to the total amount of the absorbent material, the dimension in the width direction (W) of the 2 nd water-absorbing material (47) is larger than the maximum dimension in the width direction (W) of the 1 st water-absorbing material (45), and the 1 st water-absorbing material (45) is disposed in the middle portion (14MW) in the width direction.

Description

Absorbent body and absorbent article
Technical Field
The present invention relates to an absorbent body and an absorbent article.
Background
An Absorbent article having an Absorbent (also referred to as an SAP sheet) with a high proportion of Super Absorbent Polymer (SAP) is known.
For example, patent document 1 discloses an absorbent article including a front sheet, a back sheet, and an absorbent body containing an absorbent material disposed between the front sheet and the back sheet, wherein 85% by mass or more of the absorbent material is a super absorbent polymer, and the absorbent body is provided with channels that do not contain the super absorbent polymer.
The absorbent article described in patent document 1 is considered to improve the fit and wearing feeling to the crotch of the wearer and prevent leakage.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-532507
Disclosure of Invention
Problems to be solved by the invention
However, in the absorbent article described in patent document 1, when a force is applied to the absorbent body from the leg of the wearer toward the inside in the width direction during wearing, there is a possibility that the absorbent body may be bent near the center in the width direction where the channel is provided, at a portion where the channel is provided. In such a case, the absorbent article may not fit in the crotch of the wearer, and may give a feeling of discomfort when worn and leakage of bodily fluids.
Further, the absorbent article disclosed in patent document 1 has a high water-absorbent polymer having a relatively high weight per unit area up to the widthwise ends, and therefore the high water-absorbent polymer may collide with the inside of the leg portions, which may cause discomfort.
Accordingly, an object of the present invention is to provide an absorbent body which has good fit to a crotch portion and excellent wearing feeling when worn in an absorbent article.
Means for solving the problems
The present inventors have made a solution to the above-described problem, and have provided an absorbent body having a 1 st surface and a 2 nd surface, a longitudinal direction, a width direction, and a thickness direction orthogonal to each other, the absorbent body having an absorbent core and a core wrap sheet provided on the 1 st surface side and the 2 nd surface side in the thickness direction of the absorbent core, wherein the absorbent body is divided into two widthwise opposite end portions arranged at both ends in the width direction and a widthwise intermediate portion sandwiched between the widthwise opposite end portions, the core wrap sheet includes a 1 st core wrap sheet portion positioned closer to the 1 st surface side than a thickness direction center surface of the absorbent body and a 2 nd core wrap sheet portion positioned closer to the 2 nd surface side than the thickness direction center surface of the absorbent body, and the absorbent core is a laminated absorbent core in which at least a 1 st water absorbent material and a 2 nd water absorbent material are laminated in this order from the 1 st surface toward the 2 nd surface, at least one of the 1 st water-absorbing material and the 2 nd water-absorbing material includes a super absorbent polymer in an amount of 90 mass% or more with respect to the total amount of the water-absorbing materials, a dimension of the 2 nd water-absorbing material in the width direction is larger than a maximum dimension of the 1 st water-absorbing material in the width direction, and the 1 st water-absorbing material is disposed in a middle portion in the width direction.
ADVANTAGEOUS EFFECTS OF INVENTION
The absorbent body of the present invention has good fit to the crotch portion when worn and is excellent in wearing feeling when provided in an absorbent article.
Drawings
Fig. 1 is a plan view showing a configuration example of a pants-type diaper according to an embodiment.
Fig. 2 is a sectional view taken along line II-II of fig. 1.
Fig. 3 is a schematic diagram illustrating the effect of the absorber according to the embodiment.
Description of the reference numerals
1: pants-type diaper
10: absorbent body
14: absorbent body
43: intermediate layer
44: no. 1 base material
45: no. 1 Water absorbent Material
46: no. 2 base material
47: no. 2 Water-absorbing Material
48: channel
MW: intermediate part in width direction
EW: both ends in the width direction
Detailed Description
< technical means of the present invention >
The present invention relates to the following technical solutions.
[ solution 1 ]
(Structure)
An absorbent body having a 1 st surface and a 2 nd surface, a longitudinal direction, a width direction and a thickness direction which are orthogonal to each other,
the absorbent body comprises an absorbent core and a core wrap sheet provided on the 1 st surface side and the 2 nd surface side in the thickness direction of the absorbent core, wherein,
the absorbent body is divided into two widthwise end portions disposed at both ends in the widthwise direction and a widthwise intermediate portion sandwiched by the two widthwise end portions,
the core wrap sheet includes a 1 st core wrap sheet portion located on the 1 st surface side with respect to a thickness direction center surface of the absorbent body and a 2 nd core wrap sheet portion located on the 2 nd surface side with respect to the thickness direction center surface of the absorbent body,
the absorbent core is a laminated absorbent core in which at least a 1 st water absorbing material and a 2 nd water absorbing material are laminated in this order from the 1 st surface toward the 2 nd surface,
at least one of the 1 st water absorbing material and the 2 nd water absorbing material contains 90 mass% or more of a super absorbent polymer with respect to the total amount of the water absorbing material,
the dimension in the width direction of the 2 nd water absorbent material is larger than the largest dimension in the width direction of the 1 st water absorbent material,
the 1 st water absorbent material is disposed in the width direction intermediate portion.
(Effect)
The absorbent core of the absorbent body according to claim 1 of the present invention is a laminated absorbent core in which at least a 1 st water absorbent material and a 2 nd water absorbent material are laminated in this order, wherein the 1 st water absorbent material is disposed in a widthwise intermediate portion, and a dimension of the 2 nd water absorbent material in the widthwise direction is larger than a maximum dimension of the 1 st water absorbent material in the widthwise direction.
Therefore, the basis weight of the superabsorbent polymer at both ends in the width direction of the absorbent core is reduced, and thus a difference in stiffness occurs between the middle portion in the width direction and both ends in the width direction of the absorbent body. Thus, when the absorbent article including the absorber is worn by the wearer, the absorber is bent so as to protrude upward or downward at both ends in the width direction, and the absorber is easily formed into a shape in which both ends in the width direction are raised. Since the widthwise both ends are formed in the raised shape and the widthwise both ends are formed in the shape along the inner sides of the legs of the wearer, the fit of the absorbent article to the crotch portion when worn is improved.
Further, the superabsorbent polymer at both ends in the width direction of the absorbent body according to claim 1 of the present invention has a low basis weight, and therefore, even if the absorbent body hits the inside of the leg portion, the superabsorbent polymer is less likely to cause a feeling of discomfort to the wearer, and the absorbent article provided with the absorbent body is excellent in wearing feeling.
[ solution 2 ]
(Structure)
The absorbent body according to claim 1, wherein the 1 st core wrap sheet portion includes a central sheet portion disposed in the vicinity of the center in the width direction and a pair of outer sheet portions disposed on both outer sides in the width direction,
the 1 st core wrap sheet portion includes a pair of overlapping portions where the central sheet portion overlaps with each of the pair of outer sheet portions in the thickness direction at least at both ends in the width direction, and the pair of overlapping portions extend in the longitudinal direction.
(Effect)
According to the invention of claim 2, the 1 st core wrap sheet portion includes the center sheet portion and the pair of outer sheet portions, and the center sheet portion and the outer sheet portions overlap in the thickness direction, so even if the absorbent body hits the inside of the leg of the wearer, the pair of overlapping portions function as cushioning materials, and the absorbent article including the absorbent body is excellent in the wearing feeling.
[ solution 3 ]
(Structure)
The absorbent body according to claim 2, wherein each of the pair of superposed sections does not reach the widthwise intermediate section.
(Effect)
According to claim 3 of the present invention, since the pair of overlapping portions do not reach the widthwise middle portion, respectively, the absorbent body is easily bent at both widthwise end portions of the absorbent body. Therefore, the fit of the absorbent article to the crotch portion when worn is improved.
[ solution 4 ]
(Structure)
The absorbent body according to any one of claims 1 to 3, wherein the absorbent body has an intermediate layer between the 1 st water absorbent material and the 2 nd water absorbent material,
the 1 st water-absorbent material and the 2 nd water-absorbent material are both fixed to the intermediate layer in at least a part of the region by an adhesive element extending in the longitudinal direction.
(Effect)
According to the 4 th aspect of the present invention, since the absorbent body has the intermediate layer between the 1 st water absorbent material and the 2 nd water absorbent material, and both the 1 st water absorbent material and the 2 nd water absorbent material and the intermediate layer are fixed to at least a part of the region by the adhesive element extending in the longitudinal direction, even when the absorbent body is folded, the intermediate layer maintains the shapes of the 1 st water absorbent material and the 2 nd water absorbent material, and the absorbent body is less likely to be deformed. Therefore, the fit of the absorbent article to the crotch portion when worn is improved.
[ solution 5 ]
(Structure)
The absorbent body according to claim 4, wherein at least one of the 2 nd core wrap sheet portion and the intermediate layer and the 2 nd water absorbent material are fixed to each other at both ends in the width direction by an adhesive element extending in the longitudinal direction.
(Effect)
According to the 5 th aspect of the present invention, since the 2 nd water absorbent material is fixed to at least one of the 2 nd core wrap sheet and the intermediate layer at both widthwise ends by the adhesive elements extending in the longitudinal direction, even when the absorbent body is folded, the 2 nd water absorbent material is less likely to cause deformation at both widthwise ends. Therefore, the fit of the absorbent article to the crotch portion when worn is improved.
[ solution 6 ]
(Structure)
The absorbent body according to claim 5, wherein at both widthwise end portions of the 2 nd absorbent material, there are regions where no adhesive element extends in the longitudinal direction between the 2 nd absorbent material and at least one of the 2 nd core wrap sheet portion and the intermediate layer.
(Effect)
According to claim 6 of the present invention, the absorbent body has regions where the adhesive elements do not exist, which extend in the longitudinal direction, at both widthwise end portions of the 2 nd water absorbent material. This reduces the rigidity of the width-direction both end edges of the 2 nd water absorbent material, and therefore the absorbent article provided with the absorbent body has an excellent wearing sensation.
[ solution 7 ]
(Structure)
The absorbent body according to any one of claims 1 to 6, wherein at least one of the 1 st core wrap sheet portion and the 2 nd core wrap sheet portion is a water-absorbent nonwoven fabric including water-absorbent fibers.
(Effect)
According to the 7 th aspect of the present invention, at least one of the 1 st core wrap sheet portion and the 2 nd core wrap sheet portion is a water-absorbent nonwoven fabric including water-absorbent fibers, and therefore, at least one of the 1 st core wrap sheet portion and the 2 nd core wrap sheet portion easily diffuses body fluid in the longitudinal direction and the width direction, and the 1 st water-absorbent material and the 2 nd water-absorbent material uniformly absorb water, and therefore, the fit of the absorbent article provided with the absorbent body when body fluid diffuses is improved.
[ claim 8 ] A
(Structure)
The absorbent body according to claim 7, wherein the water-absorbent nonwoven fabric is a spunlace nonwoven fabric or a spunbond nonwoven fabric.
(Effect)
According to claim 8 of the present invention, since the spun lace nonwoven fabric and the spunbond nonwoven fabric including the water-absorbent fibers are excellent in the diffusion of body fluid in the longitudinal direction and the width direction, the adhesiveness of the absorbent article having the absorbent body at the time of diffusion of body fluid is improved.
[ solution 9 ]
(Structure)
The absorbent body according to any one of claims 1 to 8, wherein the intermediate layer is a hot air non-woven fabric.
(Effect)
According to claim 9 of the present invention, since the hot air nonwoven fabric used as the intermediate layer is bulky, the cushioning effect is easily exerted at both ends in the width direction of the absorbent body, and the absorbent article provided with the absorbent body is excellent in wearing feeling.
[ solution 10 ]
(Structure)
The absorbent body according to any one of claims 1 to 9, wherein the absorbent body further comprises a low basis weight portion extending in the longitudinal direction and having a low basis weight of the superabsorbent polymer, in the 2 nd water-absorbent material.
(Effect)
According to the 10 th aspect of the present invention, since the 2 nd water absorbent material has the low basis weight portion extending in the longitudinal direction, the absorbent body is easily bent at the low basis weight portion, and the fit to the crotch portion of the absorbent article when worn is improved.
[ claim 11 ] A
(Structure)
An absorbent article comprising a topsheet, a backsheet, and the absorbent body according to any one of claims 1 to 10 disposed between the topsheet and the backsheet.
(Effect)
According to claim 11 of the present invention, the same effects as those of the absorbers according to claims 1 to 10 of the present invention can be obtained.
[ solution 12 ]
(Structure)
The absorbent article according to claim 11 above, wherein the absorbent article has leakage preventing walls and leg gathers extending in the longitudinal direction,
the elastic member for the leakage preventing wall provided in the leakage preventing wall is overlapped with the 1 st water absorbent material of the absorbent body in the thickness direction,
the leg gather elastic member provided in the leg gather does not overlap the 1 st and 2 nd absorbent materials of the absorbent body in the thickness direction.
(Effect)
According to the 12 th aspect of the present invention, since the elastic member for the leakage preventing wall and the 1 st water absorbent material of the absorbent body overlap in the thickness direction and the elastic member for the leg gather and the 1 st and 2 nd water absorbent materials of the absorbent body do not overlap in the thickness direction, the absorbent body is folded so as to be convex downward with both widthwise end edges of the 1 st water absorbent material as starting points, and both widthwise end portions of the absorbent body are in a state of being raised, and therefore, the leakage preventing wall and both raised widthwise end portions of the absorbent body can effectively prevent the side leakage of the body fluid of the absorbent article.
Underpants type disposable diaper
Hereinafter, a pants-type disposable diaper according to the embodiment (hereinafter, also simply referred to as "pants-type diaper") will be described. The type of the pants-type diaper is not limited to this example, and other types of pants-type diapers may be used without departing from the scope of the present invention. Examples of such a pants-type diaper include a 3-piece diaper. The absorbent article of the present invention is not limited to the pants-type diaper 1, and may be a tape-fixed disposable diaper, a urine absorption pad used in combination with another absorbent article, a light incontinence pad, a sanitary napkin, a panty liner, or the like.
Fig. 1 and 2 are views showing a configuration example of a pants-type diaper 1 according to an embodiment. Fig. 1 is a plan view showing a state in which a pants-type diaper 1 is unfolded, and fig. 2 is a sectional view taken along line II-II of fig. 1. In fig. 2, the pants-type diaper 1 according to the present embodiment is shown in an enlarged size in the thickness direction T so as to be easily understood. The pants-type diaper 1 has a longitudinal direction L, a width direction W, and a thickness direction T which are orthogonal to each other in the state shown in fig. 1, and has a longitudinal direction center line CL which passes through the center of the width direction W and extends in the longitudinal direction L, and a width direction center line CW which passes through the center of the length direction L and extends in the width direction W. The direction and the side close to the longitudinal center line CL are set as the inward direction and the inward side in the width direction W, respectively, and the direction and the side away from the longitudinal center line CL are set as the outward direction and the outward side in the width direction W, respectively. The direction and the side closer to the width direction center line CW are set as the inward direction and the inward side in the longitudinal direction L, respectively, and the direction and the side farther from the width direction center line CW are set as the outward direction and the outward side in the longitudinal direction L, respectively. The side facing the end edge of the pants-type diaper 1 corresponding to the abdomen of the wearer (the end edge on the abdomen side) in the longitudinal direction L is also referred to as the front side in the longitudinal direction L, and the side facing the end edge of the pants-type diaper 1 corresponding to the back of the wearer (the end edge on the back side) is also referred to as the back side in the longitudinal direction L. The "plan view" refers to the pants-type diaper 1 in a state where a plane including the longitudinal direction L and the width direction W is developed as viewed from above in the thickness direction T, and the "plan view" refers to a shape grasped in the plan view. The "planar direction" is an arbitrary direction parallel to a plane including the width direction W and the length direction L. The "skin side" and the "non-skin side" refer to a side that is relatively close to the skin surface of the wearer and a side that is relatively far from the skin surface of the wearer in the thickness direction T when the pants-type diaper 1 is worn on the wearer, and the skin-side surface of each member of the pants-type diaper 1 is referred to as a "skin-side surface" and the non-skin-side surface is referred to as a "non-skin-side surface", respectively. These definitions apply not only to the pants-type diaper 1 but also to the absorbent body 14 of the pants-type diaper 1 and the respective materials disposed thereon.
The term "the member, the structure, the shape, and the like extend in the longitudinal direction L" includes not only a case where the member and the like are parallel to the longitudinal direction L but also a case where the component Dx in the longitudinal direction L of the member and the like is larger than the component Dy in the width direction W of the member and the like (Dx > Dy). Similarly, the term "the member or the like extends in the width direction W" includes not only a case where the member or the like is parallel to the width direction W but also a case where the component Dy in the width direction W of the member or the like is larger than the component Dx in the longitudinal direction L of the member or the like (Dy > Dx). For a curved or curved member, the member is evaluated as described above with respect to the tangent line at each point on the curve or the like.
As shown in fig. 1, the pants-type diaper 1 includes a front side portion (front side waistband) 2, a back side portion (back side waistband) 3, and an absorbent main body 10 positioned between the front side portion 2 and the back side portion 3 in a longitudinal direction L. In the present embodiment, the pants-type diaper 1 further includes a crotch portion 4 located between the abdomen-side portion 2 and the back-side portion 3. The abdominal portion 2 is a portion that abuts against the abdomen of the wearer. The back portion 3 is a portion that abuts against the hip or the back of the wearer. The absorbent body 10 is a portion that contacts the crotch of the wearer, and has one end portion in the longitudinal direction L stacked on the stomach-side portion 2 and the other end portion stacked on the back-side portion 3. The crotch portion 4 is a portion that supports the absorbent main body 10 from the non-skin side. The pants-type diaper 1 is formed by overlapping both end portions 2a, 2a in the width direction W of the front side portion 2 and both end portions 3a, 3a in the width direction W of the back side portion 3 in the thickness direction T, respectively, and joining them along the longitudinal direction L. In this case, in the pants-type diaper 1, the waist opening through which the waist of the wearer passes is defined by the outer end 2e of the stomach-side portion 2 in the longitudinal direction L and the outer end 3e of the back-side portion 3 in the longitudinal direction L. In the pants-type diaper 1, a pair of leg openings through which the legs of the wearer pass are defined by the side portions 5e, 5e on both sides in the width direction W of the crotch portion 4. The abdomen-side portion (abdomen-side waistband) 2 and the back-side portion (back-side waistband) 3 can be said to be defined by a range in which both end portions 2a, 2a and both end portions 3a, 3a in the longitudinal direction L are joined.
In the present embodiment, in the state shown in fig. 1, each of the ventral portion 2 and the dorsal portion 3 has a rectangular shape that is expanded substantially in the width direction W and is separated from each other in the longitudinal direction L. The crotch portion 4 is located between the stomach portion 2 and the back portion 3, and both side edges in the width direction W are recessed inward in the width direction W. The stomach-side portion 2, the crotch portion 4, and the back-side portion 3 are integrally formed with each other. In another embodiment, the stomach-side portion, the crotch portion, and the back-side portion are formed independently of each other. In another embodiment, the pants-type diaper includes a front portion and a back portion, and does not include a crotch portion.
In the present embodiment, the stomach portion 2, the back portion 3, and the crotch portion 4 are provided with liquid-impermeable cover sheets (sheet members) 5. The cover sheet 5 includes a cover sheet 5a on the skin side and a cover sheet 5b on the non-skin side. The cover sheet 5a and the cover sheet 5b are laminated in the thickness direction T and bonded to each other with an adhesive or the like. Both ends in the longitudinal direction L of the covering sheet 5b are folded back toward the skin side so as to cover both ends in the longitudinal direction L of the covering sheet 5 a. In this case, the portion of the covering sheet 5b at the folded-back position of the abdomen portion 2 constitutes the end 2e of the abdomen portion 2, and the portion of the covering sheet 5b at the folded-back position of the back portion 3 constitutes the end 3e of the back portion 3.
Examples of the cover sheet 5 include any liquid impermeable sheet such as a liquid impermeable nonwoven fabric, a synthetic resin film, a composite sheet thereof, an SB nonwoven fabric, and an SMS nonwoven fabric. Examples of the material of the cover sheet 5 include polyolefin materials such as polypropylene and polyethylene. The weight per unit area of the cover sheet 5 is, for example, 5g/m2～100g/m2Preferably 10g/m2～50g/m2. The dimension (thickness) of the cover sheet 5 in the thickness direction T is, for example, 0.1mm to 5mm, preferably 0.1mm to 2 mm. In another embodiment, the number of cover sheets is one or more than three (not shown). In yet another embodiment, the cover sheet is not folded back (not shown).
[ absorbent body ]
In the present embodiment, the absorbent body 10 has a substantially rectangular shape, and includes a liquid-permeable front sheet 12, a liquid-impermeable back sheet 13, and an absorbent body 14 that is located between the front sheet 12 and the back sheet 13 and absorbs and retains liquid. Examples of the top sheet 12 include a liquid-permeable nonwoven fabric, a woven fabric, a synthetic resin film having liquid-permeable holes formed therein, and a composite sheet thereof. Examples of the back sheet 13 include liquid-impermeable nonwoven fabric, synthetic resin film, composite sheets thereof, and SMS nonwoven fabric. The absorbent body 14 in this embodiment includes an absorbent core for absorbing and retaining liquid and a core wrap sheet enclosing the absorbent core. The absorbent body 14 will be described in detail later. The absorbent body 14, the front sheet 12, and the back sheet 13 are bonded together with an adhesive, and the front sheet 12 and the back sheet 13 are bonded together with an adhesive at their peripheral edge portions. The adhesive is a material known in pants-type diapers, and examples thereof include hot melt adhesives. The shape of the absorbent main body 10 is not limited to the above example as long as it is long in the longitudinal direction L, and examples thereof include a rounded rectangle, a rectangle having a short side in a convex curve protruding outward, and an hourglass shape. In another embodiment, the back sheet is omitted, and the non-skin side surface of the absorbent body and the non-skin side surface of the peripheral edge portion of the front sheet are joined to the cover sheet.
(absorber)
Next, the absorbent body 14 will be described with reference to fig. 1 to 3. Fig. 3 is a schematic diagram illustrating the effect of the absorber 14 of the present embodiment. The absorbent body 14 is a layer having liquid absorbing performance and liquid retaining performance, and in the present embodiment, the absorbent body 14 has a skin-side surface corresponding to the 1 st surface and a non-skin-side surface corresponding to the 2 nd surface, and is divided into two widthwise end portions 14EW and 14EW arranged at both ends in the widthwise direction W and a widthwise intermediate portion 14MW sandwiched between the two widthwise end portions 14EW and 14 EW. Here, the widthwise both ends 14EW and 14EW are portions occupying 15% of the left and right sides of the end in the widthwise direction W of the absorber 14. The absorbent body 14 includes an absorbent core and core wrap sheets provided on the skin-side surface and the non-skin-side surface of the absorbent core in the thickness direction T. The core wrap sheet is composed of a 1 st substrate 44 and a 2 nd substrate 46. The absorbent core is a laminated absorbent core in which a 1 st water absorbent material 45, an intermediate layer 43, and a 2 nd water absorbent material 47 are laminated in this order from the skin-side surface toward the non-skin-side surface. The absorbent body 14 can also be regarded as including: a 1 st absorbent layer 41 which is positioned on the skin side and comprises a 1 st water absorbent material 45 and a 1 st base material 44; a 2 nd absorbent layer 42 which is located on the non-skin side and comprises a 2 nd water absorbent material 47 and a 2 nd base material 46; and an intermediate layer 43 located between the 1 st and 2 nd absorbent layers 41, 42. In this case, the absorbent body 14 may be regarded as having a two-layer structure in which the 1 st absorbent layer 41, the intermediate layer 43, and the 2 nd absorbent layer 42 are sequentially laminated in the thickness direction T. In another embodiment, the absorbent body has a single-layer structure in which the 1 st absorbent layer and the 2 nd absorbent layer are integrated in the thickness direction without an intermediate layer. In another embodiment, the 1 st surface constitutes a non-skin side surface, the 2 nd surface constitutes a skin side surface, the 1 st absorbent layer is positioned on the non-skin side, and the 2 nd absorbent layer is positioned on the skin side.
In the present embodiment, the absorber 14 has a substantially rectangular planar shape extending in the longitudinal direction L. However, the shape is not particularly limited, and examples thereof include a rectangle having a short side projecting in an arc shape, a rounded rectangle, an ellipse, and an hourglass shape. The thickness of the absorbent member 14 is, for example, 0.5mm to 20mm, preferably 1mm to 10 mm.
(the 1 st Water-absorbent Material)
In the present embodiment, the 1 st absorbent layer 41 has the 1 st water absorbent material 45 which becomes a part of the laminated absorbent core as the absorbent core, and has the 1 st base material 44 as the core-clad layer. The 1 st water absorbent 45 is fixed to the intermediate layer 43 with an adhesive as the adhesive elements 51 extending in the longitudinal direction L in at least a part of the surface of the intermediate layer 43 on the 1 st base material 44 side. In another embodiment, the 1 st water absorbent material is fixed to the 1 st base material with an adhesive agent as an adhesive element extending in the longitudinal direction L in at least a part of the region of the surface of the 1 st base material on the intermediate layer side. In still another embodiment, the 1 st water absorbent material is fixed to the intermediate layer and the 1 st base material with an adhesive agent as an adhesive element extending in the longitudinal direction L in at least a part of the surface of the intermediate layer on the 1 st base material side and at least a part of the region of the intermediate layer side of the 1 st base material. The water absorbing material of the 1 st water absorbing material 45 is disposed in the 1 st absorbing layer 41 with a substantially uniform basis weight. However, the weight per unit area of the end portions in the longitudinal direction L and/or the width direction W may be gradually reduced toward the edges. In another embodiment, the water-absorbing materials of the 1 st water-absorbing material are arranged in the 1 st absorbent layer in a predetermined distribution having sites with a large weight per unit area and sites with a small weight per unit area. The 1 st water absorbent material has a substantially rectangular planar shape.
(the 2 nd Water-absorbent Material)
In the present embodiment, the 2 nd absorbent layer 42 has the 2 nd water absorbing material 47 which becomes a part of the laminated absorbent core as the absorbent core, and has the 2 nd base material 46 as the core-clad layer. The 2 nd water absorbent 47 is fixed to the intermediate layer 43 with an adhesive as the adhesive elements 51 extending in the longitudinal direction L in at least a part of the surface of the intermediate layer 43 on the 2 nd base material 46 side. In another embodiment, the 2 nd water absorbent material is fixed to the 2 nd base material with an adhesive agent as an adhesive element extending in the longitudinal direction L in at least a part of the region of the surface of the 2 nd base material on the intermediate layer side. In still another embodiment, the 2 nd water absorbing material is fixed to the intermediate layer and the 2 nd base material with an adhesive agent as an adhesive element extending in the longitudinal direction L in at least a part of the surface of the intermediate layer on the 2 nd base material side and at least a part of the region of the intermediate layer side of the 2 nd base material. The absorbent material of the 2 nd absorbent material 47 is disposed in the 2 nd absorbent layer 42 with a substantially uniform basis weight except for the pair of channels 48, 48 (described later). However, the weight per unit area of the end portions in the longitudinal direction L and/or the width direction W may be gradually reduced toward the edges.
The dimension in the width direction W of the 2 nd water absorbent material 47 is larger than the maximum dimension in the width direction W of the 1 st water absorbent material 45. The 1 st water absorbent material 45 is disposed at least in the widthwise middle portion 14MW of the absorbent body 14 and does not reach both widthwise end portions of the absorbent body 14. As a result, the weight per unit area of the superabsorbent polymer at both widthwise ends 14EW, 14EW of the absorbent body 14 is reduced, and therefore a difference in stiffness occurs between the widthwise middle portion 14MW and both widthwise ends 14EW, 14EW of the absorbent body 14. Thus, as shown in fig. 3, when the pants-type diaper 1 including the absorbent body 14 is worn by the wearer, the absorbent body 14 is folded so as to be convex upward at both widthwise end portions 14EW, and both widthwise end portions 14EW, 14EW are likely to have an upright shape. Both widthwise end portions 14EW, 14EW have a bent shape, and both widthwise end portions 14EW, 14EW have a shape that is along the inner side of the legs of the wearer, and therefore the fitting properties of pant diaper 1 to the crotch portion when worn are improved. Further, since the superabsorbent polymer in the widthwise both ends 14EW, 14EW of the absorbent body 14 of the present embodiment has a low basis weight, even if the absorbent body 14 hits the inner side of the leg, the superabsorbent polymer is less likely to cause a feeling of discomfort to the wearer, and the pants-type diaper 1 provided with the absorbent body 14 is excellent in wearing feeling.
In the present embodiment, the dimension of the 2 nd water absorbent material 47 in the longitudinal direction L is larger than the maximum dimension of the 1 st water absorbent material 45 in the longitudinal direction L. In this case, the 2 nd water absorbing material 47 can also be regarded as having a substantially rectangular planar shape which is one turn larger than the 1 st water absorbing material 45 in the width direction W and the length direction L. However, in another embodiment, the dimension in the longitudinal direction L of the 2 nd water absorbent material may be the same as the dimension in the longitudinal direction L of the 1 st water absorbent material, and in yet another embodiment, the dimension in the longitudinal direction L of the 1 st water absorbent material may be larger than the maximum dimension in the longitudinal direction L of the 2 nd water absorbent material.
(super absorbent Polymer)
The 1 st water absorbing material 45 and the 2 nd water absorbing material 47 contain Super Absorbent Polymers (SAP). At least one of the 1 st water absorbing material 45 and the 2 nd water absorbing material 47 contains 90 mass% or more of a super absorbent polymer with respect to the total amount of the water absorbing materials. In another embodiment, the 1 st and 2 nd water-absorbing materials contain 90 mass% or more of a super absorbent polymer with respect to the total amount of the water-absorbing materials. The 1 st water absorbent material 45 and the 2 nd water absorbent material 47 may further include hydrophilic fibers such as pulp fibers and water absorbent fibers. Therefore, the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 can be said to contain a super absorbent polymer as a main component, and the absorbent body 14 can be said to be a so-called SAP sheet. The proportion of the super absorbent polymer to the absorbent body 14 (including not only the 1 st and 2 nd water absorbent materials 45 and 47 but also the adhesive, the 1 st base material 44, the intermediate layer 43, and the 2 nd base material 46) is, for example, 40 to 80% by mass, preferably 50 to 80% by mass, and more preferably 60 to 80% by mass. In the present embodiment, the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 are composed of only a super absorbent polymer and do not contain hydrophilic fibers. In another embodiment, the 1 st and 2 nd water-absorbing materials contain pulp fibers and/or water-absorbing fibers in addition to the super absorbent polymer.
In addition, when determining the content of the super absorbent polymer in the absorbent body 14 and the 1 st and 2 nd water absorbent materials 45 and 47, the absorbent body 14 may be hollowed out in the thickness direction in a predetermined area, and if necessary, heat or the like may be applied to soften the adhesive, the nonwoven fabric, the adhesive, the super absorbent polymer, the pulp fiber, and the like constituting each layer may be separated, the weight of each component may be measured, the weight per unit area of each component may be obtained, and the content of the super absorbent polymer may be determined based on the calculated weight per unit area.
The super absorbent polymer is not particularly limited as long as it can absorb and retain water, and examples thereof include granular or fibrous super absorbent polymers. The basis weights of the super absorbent polymers of the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 can be appropriately adjusted according to the absorption performance required for the pants-type diaper 1, but for example, the basis weights are each 10g/m2～500g/m2Preferably 100g/m2～400g/m2. The basis weights of the 1 st water-absorbing material 45 and the 2 nd water-absorbing material 47 may be larger in one than in the other, or may be the same. Wherein, the same means that one is in the range of 100% + -30% of the other.
Examples of the super absorbent polymer include starch-based, cellulose-based, and synthetic polymer-based polymeric absorbents. Examples of the starch-based or cellulose-based super absorbent polymer include a starch-acrylic acid (salt) graft copolymer, a saponified product of a starch-acrylonitrile copolymer, and a crosslinked product of sodium carboxymethylcellulose. Examples of the synthetic polymer-based super absorbent polymer include polyacrylate-based, polysulfonate-based, maleic anhydride-based, polyacrylamide-based, polyvinyl alcohol-based, polyethylene oxide-based, polyaspartate-based, polyglutamate-based, polyalphamate-based, starch-based, and cellulose-based polymers. In the present embodiment, a polyacrylate-based (particularly, sodium polyacrylate-based) super absorbent polymer is preferable. In the present embodiment, it is preferable that 90 to 100 mass% of the superabsorbent polymer in the absorbent body 14 is composed of superabsorbent polymer particles having a particle diameter of 150 to 500 μm. The superabsorbent polymer particles having such a particle size distribution have a small and uniform particle size and are therefore easily retained in the adhesive. The particle diameter of the super absorbent polymer particles is measured in accordance with JIS R6002: the screening test method described in 1998 was standard.
(channel)
In the present embodiment, the absorber 14 has a pair of channels 48, 48 extending along the longitudinal direction L. The pair of passages 48, 48 are strip-shaped regions provided in the 2 nd water absorbent material 47, extending in the longitudinal direction L, and arranged at predetermined intervals on both sides in the width direction W with respect to the longitudinal center line CL. The channel 48 is formed at least in the center portion in the longitudinal direction L across the widthwise center line CW. In another embodiment, the channel is formed to reach at least one of both end edges in the longitudinal direction L. The pattern of the pair of passages 48, 48 in plan view is, for example, a pattern formed so that the interval between the two is constant along the longitudinal direction L. In another embodiment, the pattern of the pair of channels is formed such that the interval between the channels is narrower near the center in the longitudinal direction L and expands toward both outer sides in the longitudinal direction L, for example. Here, the channels 48 are regions (low basis weight portions) in which the basis weight of the super absorbent polymer is lower than the regions around the channels of the absorbent body 14, and for example, regions in which the basis weight of the super absorbent polymer is lower than the regions around the channels 48 of the 2 nd absorbent layer 42, including the case where the basis weight is zero. The 2 nd water absorbent material 47 has a channel 48 extending in the longitudinal direction L, and as shown in fig. 3, the absorbent body 14 having the widthwise both ends 14EW, 14EW folded in the channel 48 is easily folded, and the fitting property to the crotch portion of the pants-type diaper 1 when worn is improved. The channels 48 are formed in such a manner that the 2 nd base material 46 is recessed toward the intermediate layer 43 side, that is, the 2 nd water absorbing material 47 is recessed toward the intermediate layer 43 side. In another embodiment, the 2 nd water absorbent material is formed so as to be recessed toward the 2 nd base material side. The pair of passages 48, 48 overlaps the pair of heat- seal lands 43c, 43c in the thickness direction T. In another embodiment, at least a part of the passage does not overlap with the heat-seal lands 43c in the thickness direction T. In another embodiment, the channel does not extend in the longitudinal direction L but in the width direction W, or extends not only in the longitudinal direction L but also in the width direction W. In yet another embodiment, the channel is one or more than three.
(intermediate layer)
In the present embodiment, the intermediate layer 43 is a liquid-permeable sheet and has a substantially rectangular planar shape. The intermediate layer 43 includes an upper layer 43a and a pair of lower layers 43b, 43b adjacent to the upper layer 43a on both sides in the width direction W of the non-skin side surface of the upper layer 43 a. The intermediate layer 43 is formed by folding back and overlapping a pair of side portions located on both sides of a central portion in the width direction W toward the non-skin side of the central portion in a sheet member having a substantially rectangular planar shape. At this time, the central portion of the sheet member becomes the upper layer 43a, and the pair of side portions of the sheet member becomes the pair of lower layers 43b, 43 b. Therefore, both sides of the intermediate layer 43 in the width direction W have a two-layer structure in which the upper layer 43a and the lower layer 43b are stacked, and have a substantially rectangular shape extending in the longitudinal direction L. The portion 43d in the vicinity of the center of the intermediate layer 43 in the width direction W has a single-layer structure of only the upper layer 43a, and has a substantially rectangular shape extending in the longitudinal direction L. The upper layer 43a and the lower layer 43b of the two-layer structure are joined by a pair of heat- seal portions 43c, 43c extending in the longitudinal direction L on both sides in the width direction W of the portion 43 d. The heat-seal lands 43c are formed by heating and compressing. In another embodiment, the upper and lower layers of the two-layer structure are joined by embossed portions extending along the longitudinal direction L on both sides in the width direction W of a portion in the vicinity of the center in the width direction W. The embossed portion is formed by compression. In another embodiment, the heat-seal land and the embossed land have a shape of a plurality of dots, a plurality of curves, or a pattern. Both end edges in the width direction W of the intermediate layer 43 are sandwiched and joined by both end portions in the width direction W of the 1 st base material 44 and the 2 nd base material 46, and both end edges in the longitudinal direction L of the intermediate layer 43 are sandwiched and joined by both end portions in the longitudinal direction L of the 1 st base material 44 and the 2 nd base material 46. In another embodiment, both end edges in the longitudinal direction L are not sandwiched between both end portions in the longitudinal direction L of the 1 st base material and the 2 nd base material, and are not joined. By adopting the double-layer structure, the liquid can be stored temporarily, and the time required for the super absorbent polymer to absorb can be easily ensured.
As the intermediate layer 43, for example, the same sheet as the 1 st substrate 44 can be used. The weight per unit area of the intermediate layer 43 is, for example, 10g/m2～100g/m2Preferably 15g/m2～80g/m2. The thickness of the intermediate layer 43 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm. In the present embodiment, the intermediate layer 43 is a hot-air nonwoven fabric. Since the air-through nonwoven fabric is bulky, when the intermediate layer 43 is an air-through nonwoven fabric, the cushioning effect is easily exerted on both ends 14EW and 14EW in the width direction of the absorbent body 14, and the pull-on diaper 1 provided with the absorbent body 14 is excellent in wearing feeling. In another embodiment, the intermediate layer is a nonwoven air-through fabric having hydrophilicity and liquid permeability and formed of thermoplastic synthetic fibers. In this case, liquid permeability can be ensured even when the absorbent body absorbs water. In particular, since the above-described through-air nonwoven fabric is formed of a nonwoven fabric in which fibers are thermally fused, the through-air nonwoven fabric has a certain resistance against an external load, and even when the super absorbent polymer contained in the absorbent body 14 absorbs water and swells, the absorbent body 14 can be effectively prevented from being deformed.
In the present embodiment, as the fibers constituting the hot air non-woven fabric, core-sheath composite fibers using a thermoplastic resin as a sheath component constituting at least the fiber surface are used. By using a thermoplastic resin as the sheath component constituting the fiber surface, the fiber exhibits thermal fusion characteristics, and therefore the resin component used as the core component can be appropriately selected in accordance with the desired physical properties of the intermediate layer 43. For example, by using a composite fiber in which a resin component having relatively high strength is used as a core component that does not constitute the fiber surface as the sheath-core composite fiber, an intermediate layer having more stable resistance to tensile stress and the like can be provided. Here, as the resin which can be used as the core component and the sheath component, for example, polyolefin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer resin; polyesters such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and polylactic acid; polyamides such as nylon and the like are appropriately selected and used in combination. In the present embodiment, for the purpose of achieving both the heat-sealing property and the tensile strength, it is preferable to use a polyolefin resin such as polyethylene or polypropylene as the sheath component, and it is preferable to use the above-mentioned polyolefin resin or a polyester resin such as polyethylene terephthalate as the core component. However, the intermediate layer 43 is not limited to the air-through nonwoven fabric, and may be a liquid-permeable sheet.
(core cladding sheet)
As described above, the absorbent body 14 has the 1 st base material 44 and the 2 nd base material 46 as the core wrap sheet.
The 1 st base material 44 has a substantially rectangular planar shape, and covers the 1 st absorbent material 45 from the skin side in plan view, and the peripheral edge portion of the 1 st base material 44 slightly extends outward from the periphery of the 1 st absorbent material 45. The 2 nd base material 46 has a substantially rectangular planar shape, and covers the 2 nd absorbent material 47 from the non-skin side in plan view, and the peripheral edge portion of the 2 nd base material 46 extends slightly outward from the periphery of the 2 nd absorbent material 47. At this time, both end portions in the width direction W of the 2 nd base material 46 cover both side surfaces of the 2 nd water absorbent material 47, and cover skin-side surfaces of both end portions in the width direction W of the 1 st base material 44. That is, on the skin-side surface of the end portion in the width direction W of the 1 st absorbent layer 41, the end portion in the width direction W of the 2 nd base material 46 and the end portion in the width direction W of the 1 st base material 44 are overlapped and joined.
In the present embodiment, when the absorber 14 is regarded as including the 1 st core wrap sheet portion 55 located closer to the skin surface side than the thickness direction center plane CT and the 2 nd core wrap sheet portion 56 located closer to the non-skin surface side than the thickness direction center plane CT, both end portions of the 2 nd base material 46 in the width direction W located closer to the skin surface side than the thickness direction center plane CT and the 1 st base material 44 correspond to the 1 st core wrap sheet portion 55, and a portion of the 2 nd base material 46 located closer to the non-skin surface side than the thickness direction center plane CT corresponds to the 2 nd core wrap sheet portion 56. In this case, the 1 st core wrap sheet portion 55 may be divided into the 1 st base material 44 serving as the central sheet portion 53 disposed in the vicinity of the center in the width direction W and both end portions in the width direction W of the 2 nd base material 46 serving as the pair of outer sheet portions 54, 54 disposed on both outer sides in the width direction W, and the central sheet portion 53 and the pair of outer sheet portions 54, 54 may be overlapped with each other at both end portions 14EW, 14EW in the width direction of the absorbent body 14. In this case, the overlapping portion of the central sheet portion 53 and the pair of outer sheet portions 54 and 54 extends in the longitudinal direction L, does not reach the widthwise intermediate portion 14MW, and does not overlap with the 1 st absorbent material 45 in the thickness direction T.
As described above, the overlapped portion of the center sheet portion 53 and the pair of outer sheet portions 54, 54 extends along the longitudinal direction L, both end portions in the width direction W of the 2 nd base material 46 cover the side surfaces in the width direction W of the 2 nd water absorbent material 47, and further cover the side surfaces in the width direction W of the 1 st base material 44, so that even if the absorbent body 14 hits the inner side of the leg of the wearer, the pair of overlapped portions function as cushion members, and the pull-on diaper 1 including the absorbent body 14 is excellent in the wearing feeling. Further, with the above-described configuration, the 2 nd water absorbent material 47 is enclosed in the 2 nd absorbent layer 42 in the width direction W, and the 1 st water absorbent material 45 is enclosed in the 1 st absorbent layer 41 in the width direction W. Further, since the overlapping portion of the center sheet portion 53 and the pair of outer sheet portions 54, 54 does not reach the widthwise middle portion 14MW, the absorbent body 14 is easily bent at both widthwise end portions EW, EW of the absorbent body 14. Therefore, the fitting property to the crotch portion of the pants-type diaper 1 when worn is improved. In another embodiment, the 1 st base material, the intermediate layer, and the 2 nd base material are laminated and joined in the thickness direction T at both ends in the width direction W. In another embodiment, the overlapping portion of the central panel portion and the pair of outer panel portions may reach the widthwise intermediate portion and overlap the 1 st water absorbent material in the thickness direction T.
In the present embodiment, the 1 st base material 44, the intermediate layer 43, and the 2 nd base material 46 are laminated and joined in the thickness direction T at both ends in the longitudinal direction L of the absorbent body 14. Thus, the 1 st water absorbent material 45 is enclosed in the 1 st absorbent layer 41 by the 1 st base material 44 and the intermediate layer 43 in the longitudinal direction L, and the 2 nd water absorbent material 47 is enclosed in the 2 nd absorbent layer 42 by the 2 nd base material 46 and the intermediate layer 43 in the longitudinal direction L. In another embodiment, both ends of the absorbent body in the longitudinal direction L are not covered with the 1 st base material and the 2 nd base material.
(1 st base material)
The 1 st base material 44 is not particularly limited as long as it is a liquid-permeable sheet. Examples of the 1 st substrate 44 include a liquid-permeable nonwoven fabric, a hydrophilic nonwoven fabric, and a laminated nonwoven fabric thereof, and among them, a nonwoven fabric having high water permeability is preferable. Examples of the nonwoven fabric include a spunbond nonwoven fabric and a through-air nonwoven fabric formed of polyolefin fibers such as Polyethylene (PE) and polypropylene (PP), polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polyethylene naphthalate (PEN), and a combination thereof. These fibers are preferably subjected to hydrophilization treatment by a known method. Alternatively, for example, an air-laid nonwoven fabric in which hydrophilic fibers such as pulp fibers and rayon fibers are coated with a hydrophilic binder, and a spunlace nonwoven fabric in which the hydrophilic fibers and the synthetic fibers are combined may be mentioned. In the present embodiment, an air-laid nonwoven fabric having liquid permeability and liquid retention properties, in which pulp fibers are coated with a hydrophilic binder, is used. Further, as the 1 st base material 44, one kind or plural kinds of the above-mentioned nonwoven fabrics may be usedThe woven cloth is laminated in multiple layers. The weight per unit area of the 1 st substrate 44 is, for example, 10g/m2～100g/m2Preferably 20g/m2～80g/m2. The thickness of the 1 st substrate 44 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.
(2 nd base material)
The 2 nd substrate 46 is not particularly limited as long as it is a sheet having water retentivity and liquid diffusibility. The fibers constituting the 2 nd substrate 46 include water-absorbent fibers, and the sheet having water retentivity and liquid diffusibility includes a water-absorbent nonwoven fabric. This makes it easier for the 2 nd base material 46 to diffuse the body fluid in the longitudinal direction L and the width direction W, and allows the 2 nd water-absorbing material 47 to absorb water uniformly, so that the fitting properties when the body fluid is diffused in the pants-type diaper 1 including the absorber 14 are improved. Examples of the water-absorbent fibers include synthetic fibers such as polyamide fibers, regenerated fibers such as rayon fibers and acetate fibers, and natural fibers such as cotton, silk, hemp and pulp (cellulose) fibers, and examples of the water-absorbent nonwoven fabric formed of the water-absorbent fibers include a nonwoven fabric formed using only 1 type of the water-absorbent fibers described above, or a nonwoven fabric formed by combining a plurality of types of the water-absorbent fibers. Specifically, for example, a spunbonded nonwoven fabric containing nylon and a spunlace nonwoven fabric containing rayon fibers and/or pulp fibers can be cited. Since the spunlace nonwoven fabric and the spunbond nonwoven fabric each including the water-absorbent fibers have excellent diffusion properties of body fluid in the longitudinal direction L and the width direction W, the 2 nd water-absorbent material 47 absorbs water uniformly, and the fitting properties of the pants-type diaper 1 having the absorbent body 14 at the time of diffusion of body fluid are improved. The spun lace nonwoven fabric containing rayon fibers and/or pulp fibers may also contain polyolefin fibers and/or polyester fibers. In the present embodiment, a spunlace nonwoven fabric containing rayon fibers and pulp fibers, which has liquid retention and liquid diffusion properties, is used. Further, as the 2 nd base material 46, one kind or plural kinds of the above nonwoven fabrics may be laminated in plural. The weight per unit area of the 2 nd substrate 46 is, for example, 10g/m2～200g/m2Preferably 35g/m2～150g/m2. No. 2 base materialThe thickness of 46 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.
In another embodiment, the 1 st base material may be a sheet having water retentivity and liquid diffusibility.
(bonding element)
In the present embodiment, the 1 st water absorbing material 45, the 2 nd water absorbing material 47, and the intermediate layer 43 are fixed to each other by the adhesive elements 51 extending in the longitudinal direction L in at least a part of the region. Thus, even when the absorbent body 14 is folded, the intermediate layer 43 maintains the shapes of the 1 st water absorbent material 45 and the 2 nd water absorbent material 47, and the absorbent body 14 is less likely to be deformed. Therefore, the fitting property to the crotch portion of the pants-type diaper 1 when worn is improved. The 2 nd water absorbent material 47 is fixed to the intermediate layer 43 by the adhesive elements 51 extending in the longitudinal direction L at both ends 14EW and 14EW in the width direction of the absorbent body 14. Thus, even when the absorbent body 14 is folded so as to protrude upward or protrude downward, the 2 nd water absorbent material 47 is less likely to be deformed at both ends 14EW and 14EW in the width direction. Therefore, the fitting property to the crotch portion of the pants-type diaper 1 when worn is improved. In another embodiment, the 2 nd water absorbent material is fixed to the 2 nd base material at both widthwise ends of the absorbent body by adhesive elements extending in the longitudinal direction L.
In the present embodiment, the 2 nd water absorbent material 47 has adhesive element-free regions 52 extending in the longitudinal direction L between the 2 nd water absorbent material and the 2 nd base material 46 at both widthwise end portions thereof. This reduces the rigidity of the 2 nd water absorbent material 47 at both widthwise end portions, and therefore the pants-type diaper 1 provided with the absorbent body 14 is excellent in the wearing feeling. In another embodiment, the 2 nd water absorbent material has regions where the adhesive elements extending in the longitudinal direction L are not present between the 2 nd water absorbent material and the intermediate layer at both widthwise end portions of the 2 nd water absorbent material.
The bonding element can be formed as follows: after applying an adhesive to the 1 st substrate 44, the intermediate layer 43, or the 2 nd substrate 46, a super absorbent polymer is dispersed and pressure-bonded/fixed. As the adhesive, as long asThe adhesive is not particularly limited as long as it can fix the super absorbent polymer, and examples thereof include a hot melt adhesive. The pattern of the adhesive to be applied is not particularly limited, but examples thereof include a continuous or intermittent Ω pattern, a spiral pattern, and a line pattern. The basis weight of the adhesive can be appropriately adjusted so as not to significantly reduce the liquid absorbency of the absorbent body 14, and for example, each layer is 3g/m2～50g/m2. Here, each layer means a layer of the adhesive between the 1 st water absorbent material 45 and the 1 st base 44, a layer of the adhesive between the 1 st water absorbent material 45 and the intermediate layer 43, a layer of the adhesive between the 2 nd water absorbent material 47 and the 2 nd base 46, and a layer of the adhesive between the 2 nd water absorbent material 47 and the intermediate layer 43.
(leakage-proof wall)
In the present embodiment, the surface of the absorbent main body 10 on the skin side includes a pair of side sheets 17 and 17 located on both sides in the width direction W and extending in the longitudinal direction L. Each side sheet 17 has a leakage preventing wall 16 and fastening regions 15, 15. The fastening regions 15, 15 are positioned at the front and rear ends of the side sheet 17 in the longitudinal direction L and are fastened to the skin-side surface of the absorbent main body 10. The leakage preventing wall 16 is located between the front and rear fastening regions 15, 15 in the longitudinal direction L of the side sheet 17, is adjacent to them, and fastens the outer end edge in the width direction W to the skin-side surface of the absorbent main body 10, and fastens the inner end edge in the width direction W. In this case, the leakage preventing walls 16 and the fastening regions 15, 15 are formed by, for example, inner portions of the side sheets 17 in the width direction W, and outer portions of the side sheets 17 in the width direction W are fastened to the absorbent main body 10. In this manner, the absorbent main body 10 includes the pair of leakage preventing walls 16, 16. The pair of leakage preventing walls 16, 16 are disposed so as to face each other at both end portions in the width direction W on the skin side of the absorbent main body 10, and extend continuously along the longitudinal direction L. Each of the leakage preventing walls 16 includes two elastic members 61 for leakage preventing walls extending in the longitudinal direction L at inner ends in the width direction W. The elastic member 61 for the leakage preventing wall is exemplified as a rubber band. In another embodiment, the pair of leakage preventing walls each further folds back an inner end portion in the width direction W to an outer side in the width direction W. In another embodiment, the number of the elastic members for the leakage preventing wall is one or more than three. The pair of leakage preventing walls 16, 16 are each formed of a hydrophobic sheet, such as a hydrophobic nonwoven fabric. In another embodiment, it is formed of a hydrophilic sheet, such as a hydrophilic nonwoven fabric.
[ leg gather ]
In the present embodiment, the pants-type diaper 1 includes a plurality of leg gather elastic members 8 for leg gathers from the crotch portion 4 to the back portion 3 and the abdomen portion 2. The plurality of leg gather elastic members 8 extend mainly in the longitudinal direction L at both ends in the width direction W of the crotch portion 4. The plurality of leg gather elastic members 8 are for stretching and contracting the pair of leg openings, respectively, and are exemplified by rubber bands.
In another embodiment, the elastic member for the leakage preventing wall provided in the leakage preventing wall overlaps the 1 st absorbent material of the absorbent body in the thickness direction T, and the elastic member for the leg gather provided in the leg gather overlaps the 1 st and 2 nd absorbent materials of the absorbent body in the thickness direction T, and overlaps the region on the outer side in the width direction than the 2 nd absorbent material of the pants-type diaper. Thus, the absorbent body is folded so as to project downward from both widthwise edges of the 1 st water absorbent material as starting points, and both widthwise ends of the absorbent body are in an upright state, so that the leakage preventing walls and the upright widthwise ends of the absorbent body can effectively prevent the body fluid from leaking laterally in the absorbent article.
[ waist gather ]
In the present embodiment, the abdomen-side portion 2 is provided with a plurality of elastic members 6a, 6b for waist gather between the covering sheet 5a and the covering sheet 5b, and the back-side portion 3 is provided with a plurality of elastic members 7a, 7b for waist gather between the covering sheet 5a and the covering sheet 5 b. The plurality of elastic members 6a and 6b are disposed inside and outside the abdominal portion 2 in the longitudinal direction L. The plurality of elastic members 6a are arranged in the longitudinal direction L along the width direction W in predetermined regions on both sides across the longitudinal center line CL at intervals. The predetermined region is a region from the end portion 2a to a portion inside an end edge of the absorbent main body 10 in the width direction W opposed to the end portion 2 a. The plurality of elastic members 6b extend from the one end portion 2a to the other end portion 2a in the width direction W, and are arranged at intervals in the longitudinal direction L. Similarly, the plurality of elastic members 7a and 7b are disposed inside and outside the back portion 3 in the longitudinal direction L. The plurality of elastic members 7a are arranged in the longitudinal direction L along the width direction W in predetermined regions on both sides across the longitudinal center line CL at intervals from each other. The predetermined region is a region from the end portion 3a to a portion inside an end edge of the absorbent main body 10 in the width direction W opposed to the end portion 3 a. The plurality of elastic members 7b extend from the one end portion 3a to the other end portion 3a in the width direction W and are arranged at intervals in the longitudinal direction L. The plurality of elastic members 6a, 6b, 7a, and 7b are for extending and contracting the waist opening, and are exemplified by rubber bands. The abdomen-side portion (abdomen-side waistband) 2 and the back-side portion (back-side waistband) 3 may be defined by a range in the longitudinal direction L in which the plurality of elastic members 6a, 6b, 7a, 7b are arranged.
Next, a method for producing the absorbent body 14 will be described.
First, the sheet for the 2 nd substrate 46 is moved in the longitudinal direction L, and the hot melt adhesive is applied to the sheet for the 2 nd substrate 46. Next, the super absorbent polymer was scattered from the super absorbent polymer supply device in the longitudinal direction L onto both end portions and the central portion in the width direction W of the sheet for the 2 nd substrate 46 coated with the hot melt adhesive, respectively. At this time, a small amount of the super absorbent polymer is transferred to the region (corresponding to the channel) between the both end portions and the central portion. Next, a sheet for the intermediate layer 43 coated with hot melt adhesive on both sides was laminated on the super absorbent polymer on the sheet for the 2 nd substrate 46. Next, the laminate was moved in the longitudinal direction L while scattering the super absorbent polymer from another super absorbent polymer supply device in the longitudinal direction L onto the central portion in the width direction W of the sheet for the intermediate layer 43 coated with the hot melt adhesive. Next, the sheet for the 1 st substrate 44 coated with the hot melt adhesive was laminated on the super absorbent polymer on the sheet for the intermediate layer 43 so that the hot melt adhesive was located on the super absorbent polymer side. Then, both side portions in the width direction W of the sheet for the 2 nd base material 46 were folded back to both side portions in the width direction W of the sheet for the 1 st base material 44 to obtain a laminate. After that, the thickness of the laminate is adjusted by passing the laminate through a pair of press rolls, i.e., pressing, to obtain the absorbent body 14.
Next, a method for manufacturing a pants-type diaper using the absorbent body 14 will be described.
A liquid-permeable front sheet 12 is attached to the upper surface (the surface of the 1 st base 44) of the absorber 14 produced as described above, and a liquid-impermeable back sheet 13 is attached to the lower surface (the surface of the 2 nd base 46) of the absorber 14, thereby obtaining a laminate. Next, the side sheets 17 with the leakage preventing walls 16 are attached to both sides in the width direction W of the laminate to obtain the absorbent main body 10. Thereafter, the absorbent body 10 is attached to the cover sheet 5 (including the elastic members 6, 7, and 8), and both ends 2a and 2a in the width direction W of the abdomen-side portion 2 and both ends 3a and 3a in the width direction W of the back-side portion 3 are joined. Thereby, the pants-type diaper 1 is manufactured.
The pants-type diaper of the present invention and the absorber thereof are not limited to the above-described embodiments, and known techniques can be applied by combining the embodiments without departing from the object and spirit of the present invention.

Claims (12)

1. An absorbent body having a 1 st surface and a 2 nd surface, a longitudinal direction, a width direction and a thickness direction which are orthogonal to each other,
the absorbent body comprises an absorbent core and a core wrap sheet provided on the 1 st surface side and the 2 nd surface side in the thickness direction of the absorbent core, wherein,
the absorbent body is divided into two widthwise end portions disposed at both ends in the widthwise direction and a widthwise intermediate portion sandwiched by the two widthwise end portions,
the core wrap sheet includes a 1 st core wrap sheet portion located on the 1 st surface side with respect to a thickness direction center surface of the absorbent body and a 2 nd core wrap sheet portion located on the 2 nd surface side with respect to the thickness direction center surface of the absorbent body,
the absorbent core is a laminated absorbent core in which at least a 1 st water absorbing material and a 2 nd water absorbing material are laminated in this order from the 1 st surface toward the 2 nd surface,
at least one of the 1 st water absorbing material and the 2 nd water absorbing material contains 90 mass% or more of a super absorbent polymer with respect to the total amount of the water absorbing material,
the dimension in the width direction of the 2 nd water absorbent material is larger than the largest dimension in the width direction of the 1 st water absorbent material,
the 1 st water absorbent material is disposed in the width direction intermediate portion.
2. The absorbent body according to claim 1, wherein,
the 1 st core wrap sheet portion includes a central sheet portion disposed in the vicinity of the center in the width direction and a pair of outer sheet portions disposed on both outer sides in the width direction,
the 1 st core wrap sheet portion includes a pair of overlapping portions where the central sheet portion overlaps with each of the pair of outer sheet portions in the thickness direction at least at both ends in the width direction, and the pair of overlapping portions extend in the longitudinal direction.
3. The absorbent body according to claim 2, wherein,
each of the pair of overlapping portions does not reach the widthwise intermediate portion.
4. The absorbent body according to any one of claims 1 to 3, wherein,
the absorbent body has an intermediate layer between the 1 st water absorbent material and the 2 nd water absorbent material,
the 1 st water-absorbent material and the 2 nd water-absorbent material are both fixed to the intermediate layer in at least a part of the region by an adhesive element extending in the longitudinal direction.
5. The absorbent body according to claim 4, wherein,
at least one of the 2 nd core wrap sheet portion and the intermediate layer and the 2 nd water absorbent material are fixed to each other at both ends in the width direction by an adhesive element extending in the longitudinal direction.
6. The absorbent body according to claim 5, wherein,
at both widthwise end portions of the 2 nd absorbent material, there are regions where no adhesive element extends in the longitudinal direction between the 2 nd absorbent material and at least one of the 2 nd core wrap sheet portion and the intermediate layer.
7. The absorbent body according to any one of claims 1 to 3, wherein,
at least one of the 1 st core wrap sheet part and the 2 nd core wrap sheet part is a water-absorbent nonwoven fabric including water-absorbent fibers.
8. The absorbent body according to claim 7, wherein,
the water-absorbent nonwoven fabric is a spunlace nonwoven fabric or a spunbond nonwoven fabric.
9. The absorbent body according to claim 4, wherein,
the middle layer is hot air non-woven fabric.
10. The absorbent body according to any one of claims 1 to 3, wherein,
the absorbent body further includes a low basis weight portion extending in the longitudinal direction and having a low basis weight of the super absorbent polymer, in the 2 nd absorbent material.
11. An absorbent article in which, in the case of a disposable absorbent article,
an absorbent article comprising a front sheet, a back sheet, and the absorbent body according to any one of claims 1 to 10 disposed between the front sheet and the back sheet.
12. The absorbent article of claim 11,
the absorbent article has leakage preventing walls and leg gathers extending in the longitudinal direction,
the elastic member for the leakage preventing wall provided in the leakage preventing wall is overlapped with the 1 st water absorbent material of the absorbent body in the thickness direction,
the leg gather elastic member provided in the leg gather does not overlap the 1 st and 2 nd absorbent materials of the absorbent body in the thickness direction.
CN201811633255.6A 2018-12-29 2018-12-29 Absorbent body and absorbent article Pending CN111374833A (en)

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CN201811633255.6A CN111374833A (en) 2018-12-29 2018-12-29 Absorbent body and absorbent article
JP2019223253A JP2020108747A (en) 2018-12-29 2019-12-10 Absorber and absorbent article

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811633255.6A CN111374833A (en) 2018-12-29 2018-12-29 Absorbent body and absorbent article

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CN111374833A true CN111374833A (en) 2020-07-07

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