WO2010113754A1 - 吸水シート - Google Patents
吸水シート Download PDFInfo
- Publication number
- WO2010113754A1 WO2010113754A1 PCT/JP2010/055221 JP2010055221W WO2010113754A1 WO 2010113754 A1 WO2010113754 A1 WO 2010113754A1 JP 2010055221 W JP2010055221 W JP 2010055221W WO 2010113754 A1 WO2010113754 A1 WO 2010113754A1
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- WIPO (PCT)
- Prior art keywords
- water
- sheet
- embossing
- absorbent sheet
- absorbent
- Prior art date
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Classifications
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- 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
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- 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
-
- 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
- A61F13/45—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 shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
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- 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
Definitions
- the present invention relates to a thin water absorbent sheet that can be used in the field of sanitary materials. More specifically, the present invention relates to a water-absorbing sheet with very little pulp, which can be suitably used for absorbent articles such as disposable diapers and incontinence pads, which has a high liquid permeation rate and does not leak. Furthermore, the present invention relates to an absorbent article using such a water absorbent sheet.
- Body fluid absorbent articles used for paper diapers, etc. are absorbent bodies that absorb fluids such as body fluids, flexible liquid-permeable surface sheets (top sheets) that are placed on the side that contacts the body, and the opposite side that contacts the body And a liquid-impermeable back sheet (back sheet).
- absorbent bodies that absorb fluids such as body fluids, flexible liquid-permeable surface sheets (top sheets) that are placed on the side that contacts the body, and the opposite side that contacts the body And a liquid-impermeable back sheet (back sheet).
- An absorber using a low ratio of hydrophilic fibers and using a large amount of water-absorbing resin is preferable for thinning from the viewpoint of reducing bulky hydrophilic fibers and retaining liquid.
- so-called “gel blocking phenomenon” occurs when a large amount of water-absorbing resin becomes a soft gel by absorption, The liquid diffusibility is remarkably lowered and the liquid permeation rate of the absorber is slow.
- This “gel blocking phenomenon” means that when a dense absorbent body absorbs a liquid, the water absorbent resin existing near the surface layer absorbs the liquid, and the soft gel becomes denser near the surface layer. This is a phenomenon in which the penetration of the liquid into the absorber is hindered and the water absorbent resin inside cannot absorb the liquid efficiently.
- an absorbent body with reduced hydrophilic fibers that contribute to form retention is reduced in strength as the absorbent body, and is liable to cause deformation such as kinking and tearing before or after absorption of the liquid.
- the deformed absorber is not able to exhibit the original ability of the absorber because the diffusibility of the liquid is significantly reduced. If an attempt is made to avoid such a phenomenon, the ratio between the hydrophilic fiber and the water-absorbent resin is limited, and there is a limit in reducing the thickness of the absorbent article.
- An object of the present invention is to provide a water-absorbent sheet that can be suitably used for absorbent articles such as paper diapers, in which pulp has a very low penetration rate of liquid such as urine and prevents liquid leakage from the absorbent body. is there. Furthermore, the subject of this invention is providing the absorbent article which uses this water absorbing sheet.
- the gist of the present invention is as follows.
- One or a plurality of continuous wave-shaped embosses 2 that do not overlap each other and a wave-shaped top 3 formed by the wave-shaped embosses 2 are absorbed in the central region W1 of the water-absorbing sheet 1 in the longitudinal direction.
- the embossed branch structure formed by the corrugated embossing 2 and the linear embossing 4 has a substantially Y shape, and is provided with linear embossing 4 directed toward the end along the longitudinal direction of the sheet 1.
- Non-embossed regions W2 and W2 ′ extending in the longitudinal direction and not embossed are provided at the end along the longitudinal direction of the water absorbent sheet 1, and the area ratio of the emboss applied to the water absorbent sheet 1 is further increased. 3 to 25% of the total area of the water-absorbent sheet 1, a water-absorbent sheet; and [2] the water-absorbent sheet according to [1] is sandwiched between a liquid-permeable sheet and a liquid-impermeable sheet.
- the present invention it is possible to provide a water-absorbing sheet that has a high liquid permeation rate and that does not cause liquid leakage by applying a specific embossed shape to the water-absorbing sheet, even if the water-absorbing sheet has very little pulp. The effect that it can be produced. Therefore, by incorporating and using as an absorbent body such as a paper diaper, an absorbent article having excellent absorption performance can be provided.
- FIG. 1 It is a top view which shows typically an example of the water absorbing sheet of this invention.
- the water-absorbing sheet 1 absorbs water from one continuous wave-shaped emboss 2 extending in the longitudinal direction and a wave-shaped top 3 formed by the wave-shaped emboss 2 in the longitudinal central region W 1.
- a linear emboss 4 is applied toward the end along the longitudinal direction of the sheet 1.
- region (W2, W2 ') which is not given to the embossing extended in the said longitudinal direction is provided in the edge part along the longitudinal direction of the said water absorbing sheet 1.
- FIG. 2 is a schematic diagram of an apparatus used to perform a leak test on a slope. It is a top view of the water absorption sheet which shows one Example (Example 1) of this invention. It is a top view of the water absorption sheet which shows the other Example (Example 2) of this invention. It is a top view of the water absorption sheet which shows the other Example (Example 3) of this invention. It is a top view of the water absorption sheet which shows the other Example (Example 4) of this invention. It is a top view of the water absorption sheet which shows the other Example (Example 5) of this invention.
- the water-absorbent sheet in the present invention has a structure in which at least an absorbent layer containing a water-absorbent resin is sandwiched between two or more hydrophilic nonwoven fabrics, and further has a specific embossed shape.
- water-absorbing resin used in the present invention known water-absorbing resins can be used. Examples include hydrolyzate of starch-acrylonitrile graft copolymer, neutralized product of starch-acrylic acid graft polymer, vinyl acetate-acrylic. Examples thereof include water-absorbing resins such as saponified acid ester copolymers and partially neutralized polyacrylic acid. Of these, partially neutralized polyacrylic acid is preferable from an industrial viewpoint such as supply capacity and cost. Examples of the method for synthesizing the partially neutralized polyacrylic acid include a reverse phase suspension polymerization method and an aqueous solution polymerization method.
- the water-absorbent resin obtained by the reverse-phase suspension polymerization method is more preferably used from the viewpoint of good fluidity of the obtained particles, few fine powders, and high water absorption performance such as absorption capacity and water absorption speed. Is done.
- the basis weight of the water-absorbent resin used in the present invention is preferably 100 to 800 g / m 2 , more preferably 200 to 700 g / m 2 , and still more preferably from the viewpoint of obtaining sufficient water absorption capability as an absorbent body such as a disposable diaper. It is 250 to 600 g / m 2 , more preferably 270 to 550 g / m 2 . 100 g / m 2 or more is preferable from the viewpoint of exhibiting sufficient water absorption capability as an absorber, suppressing the occurrence of the above-mentioned “gel blocking phenomenon”, ensuring liquid diffusibility as an absorber and suppressing a decrease in permeation rate. From the viewpoint, 800 g / m 2 or less is preferable.
- the hydrophilic non-woven fabric used in the present invention is not particularly limited as long as it is a non-woven fabric known in the technical field, but from the viewpoint of liquid permeability, flexibility and strength when used as a sheet, polyethylene (PE), polypropylene (PP) and other polyolefin fibers, polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polyester fibers such as polyethylene naphthalate (PEN), polyamide fibers such as nylon, rayon fibers, and other non-woven fabrics made of synthetic fibers, Nonwoven fabrics produced by mixing cotton, silk, hemp, pulp (cellulose) fibers and the like can be mentioned, and a mixture of these two or more types of fibers may be used.
- the surface may be hydrophilized by a well-known method as needed.
- a synthetic fiber non-woven fabric is preferably used, and at least one selected from the group consisting of rayon fibers, polyolefin fibers, polyester fibers and mixtures thereof is preferable.
- the hydrophilic non-woven fabric of synthetic fibers may contain a small amount of pulp fibers to the extent that the thickness of the water absorbent sheet is not increased.
- the hydrophilic nonwoven fabric in the present invention has an appropriate basis weight and a moderate weight from the viewpoint of imparting good liquid permeability, flexibility, strength and cushioning properties to the water absorbent sheet of the present invention, and from the viewpoint of increasing the penetration speed of the water absorbent sheet.
- a non-woven fabric having a sufficient thickness is preferred.
- the basis weight is preferably 15 g / m 2 or more, more preferably in the range of 30 to 250 g / m 2 , and still more preferably in the range of 45 to 150 g / m 2 .
- the thickness of the hydrophilic nonwoven fabric is preferably in the range of 200 to 1500 ⁇ m, more preferably in the range of 250 to 1200 ⁇ m, and still more preferably in the range of 300 to 1000 ⁇ m.
- the absorbent layer in the present invention contains at least a water-absorbing resin, for example, one or a plurality of types of water-absorbing resin, a small amount of hydrophilicity that does not increase the thickness of the water-absorbing resin and the water-absorbing sheet. And those made of a mixture of a water-soluble resin and an adhesive.
- the water-absorbing resin is fixed, and the water-absorbing resin moves in the water-absorbing sheet before or during use, and from the viewpoint of preventing the occurrence of unevenness, a mixture of the water-absorbing resin and an adhesive is used. preferable.
- the absorption layer may be a single layer or a multiple layer fractionated with a hydrophilic nonwoven fabric.
- examples of the adhesive used include rubber adhesives such as natural rubber, butyl rubber and polyisoprene; styrene-isoprene block copolymer (SIS), styrene-butadiene block copolymer Styrenic elastomer adhesives such as (SBS), styrene-isobutylene block copolymer (SIBS), styrene-ethylene-butylene-styrene block copolymer (SEBS); ethylene-vinyl acetate copolymer (EVA) adhesive; Ethylene-acrylic acid derivative copolymer adhesives such as ethylene-ethyl acrylate copolymer (EEA) and ethylene-butyl acrylate copolymer (EBA); ethylene-acrylic acid copolymer (EAA) adhesive; Polyamide adhesives such as polymerized nylon and dimer acid-based polyamide; polyethylene, polypropylene, atactic polyamide;
- an ethylene-vinyl acetate copolymer adhesive, a styrene-based elastomer adhesive, a polyolefin is used from the viewpoint of strong adhesive strength and prevention of peeling of the hydrophilic nonwoven fabric on the water absorbent sheet and dissipation of the water absorbent resin.
- a system adhesive and a polyester adhesive are preferable.
- the melting temperature or softening point of the adhesive used is preferably 60 to 180 ° C., more preferably 70 to 150 ° C., from the viewpoint of sufficiently fixing the water-absorbent resin to the nonwoven fabric and preventing thermal deterioration and deformation of the nonwoven fabric. .
- the adhesive is in the state of being bonded to a nonwoven fabric or a hydrophilic resin in a state of being solidified by cooling after being melted in the manufacturing process of the water-absorbing sheet.
- the content of the adhesive used is preferably in the range of 0.05 to 2.0 times the content of the water-absorbent resin (by mass), and preferably in the range of 0.08 to 1.5 times. More preferably, the range is 0.1 to 1.0 times. From the viewpoint of preventing peeling between hydrophilic nonwoven fabrics and dissipation of the water-absorbent resin by sufficient adhesion, and increasing the strength of the water-absorbent sheet, the content of the adhesive is preferably 0.05 times or more, and the adhesion becomes stronger. From the viewpoint of avoiding the inhibition of swelling of the water-absorbent resin due to passing and improving the permeation rate and liquid leakage of the water-absorbent sheet, the content of the adhesive is preferably 2.0 times or less.
- the liquid is diffused in the longitudinal direction by applying continuous wave embossing in the central region in the longitudinal direction of the water absorbent sheet.
- This continuous embossing is considered to have a role of a passage (liquid transport passage) for flowing a large amount of liquid.
- the liquid temporarily stops at the part where the embossing is cut and then spreads around it. Since it takes time to reach the embossed portion, the permeation speed is also slowed down.
- the distance of the liquid transport passage is short, diffuses before the liquid is absorbed by the water absorbent sheet, and from the longitudinal direction of the water absorbent sheet Liquid leakage occurs.
- the continuous wave embossing in the present invention may be at least one, but may be a plurality that do not overlap each other.
- a plurality of liquid transport passages improve the efficiency of diffusion and increase the permeation speed, so that a plurality of liquid transport paths are preferable.However, from the viewpoint of suppressing leakage in an inclination due to an increase in the number of liquid transport passages, a smaller number is more preferable. preferable. Therefore, the number of corrugated embosses is preferably 1 to 3, and more preferably 1. When even a part of the embossed portion overlaps, a spatially closed region such as a bag is formed around the overlapping portion.
- the absorbent layer In the closed region, when the water absorbent resin of the absorbent layer absorbs the liquid and swells, the absorbent layer is pressed against the upper and lower hydrophilic nonwoven fabrics, and the swelling of the water absorbent resin is inhibited. As a result, in this closed region, the “gel blocking phenomenon” is likely to occur, and the water absorption capacity of the water absorbent sheet is lowered, for example, the permeation rate is slow. Therefore, in the present invention, it is preferable to apply corrugated (and linear) embossing so that such a closed region is not formed.
- the shape of the corrugated embossing in this specification that is, the shape of the embossing between the tops of the corrugated shapes formed by corrugated embossing is not particularly limited, and may be a straight line or a curved line.
- the width of the central region W1 of the water absorbent sheet that is schematically shown in FIG. 1 and is subjected to continuous wave embossing in the present invention is preferably in the range of 0.15 to 0.45 times the total width of the water absorbent sheet.
- the range of 0.2 to 0.4 times is more preferable.
- 0.15 times or more is preferable from the viewpoint of securing a liquid diffusing region and preventing liquid leakage from the longitudinal direction of the water-absorbent sheet, and from the viewpoint of promoting diffusion of the liquid in the longitudinal direction and ensuring a permeation rate. 45 times or less is preferable. If the width of the central region W1 becomes too large, the distance of the liquid transport passage with respect to the width direction of the water absorbent sheet 1 becomes long, so that the diffusion in the longitudinal direction is deteriorated and the permeation rate tends to be slow.
- each wave-shaped top 3 formed by the wave-shaped emboss 2 preferably from each vertex 3 of the wave-shaped to the end along the longitudinal direction of the water-absorbing sheet 1.
- emboss 4 diffusion in the width direction of the water absorbent sheet 1 is improved, and by intersecting with the flow of liquid moving in the longitudinal direction, liquid leakage in the longitudinal direction is suppressed.
- a predetermined effect is exhibited by applying the linear emboss 4 from each wave-shaped top 3, but the viewpoint of minimizing the influence in the closed region and suppressing the decrease in the permeation rate It is preferable that a linear emboss 4 is applied from each vertex 3 of the wave shape.
- the top of the wave shape means an embossed portion including the apex of the wave shape and the vicinity thereof, for example, an embossed portion that spreads left and right around the wave shape apex, and the wavelength of the wave shape emboss The embossed portion is within 0.3 times the range.
- the branch structure of the emboss formed by the wave-shaped emboss 2 and the linear emboss 4 has a substantially Y shape.
- the embosses overlap in such a branched structure at the top of the corrugated emboss, it is possible to avoid the deterioration of the water absorption performance of the water absorbent sheet due to the closed region formed around the embossed overlapping portion.
- the embossed shape of the corrugated embossing and the embossed shape of the linear embossing may be straight or curved. Therefore, the embossing constituting the substantially Y-shaped branch structure may be a straight embossing or a curved embossing. However, both may be mixed.
- the linear emboss is applied only to the corrugated embosses existing at both ends of the plural embosses, that is, only the two outermost corrugated embosses in the width direction of the water absorbent sheet.
- a spatially closed region is formed between the corrugated embosses by embossed overlapping portions, so that water absorption performance tends to decrease.
- non-embossed areas W2, W2 ′ that are not embossed are provided at the ends along the longitudinal direction, and diffusion of body fluids is performed in this area. Is reduced, and liquid leakage in the width direction of the water absorbent sheet is suppressed.
- the width of each of the non-embossed regions (W2, W2 ′) shown in FIG. 1 in the present invention is preferably in the range of 0.05 to 0.20 times the total width of the water absorbent sheet 1, and is 0.08 to 0.15. A range of double is more preferable. From the viewpoint of suppressing the liquid leakage from the width direction from the water absorbent sheet, 0.05 times or more is preferable, and from the viewpoint of suppressing a decrease in the permeation rate as the water absorbent sheet due to an excessively large area where diffusion is reduced, 0 20 times or less is preferable.
- the area ratio of the emboss applied to the water absorbent sheet in the present invention is 3 to 25% of the total area of the water absorbent sheet, preferably 4 to 20%, more preferably 5 to 15%. 3% or more is preferable from the viewpoint of accelerating the diffusion of the liquid by ensuring the distance of the embossed portion as the liquid transport passage and increasing the permeation speed, and prevents the diffusion that may occur before the liquid is absorbed by the water absorbent sheet. From the viewpoint of preventing liquid leakage from the water absorbent sheet and softening the texture of the water absorbent sheet, 25% or less is preferable.
- the total area of the water-absorbing sheet is the entire area of one side when embossing is applied to one side of the water-absorbing sheet, and the both sides when embossing is applied to both sides of the water-absorbing sheet. Is the total area.
- a method for embossing the water-absorbent sheet in the present invention a method using pressure, heat or an adhesive may be mentioned, and a method combining them may be used.
- additives such as a deodorant, an antibacterial agent and a gel stabilizer may be appropriately blended in the water absorbent sheet of the present invention.
- An absorbent article can be obtained using the water absorbent sheet of the present invention.
- the absorbent article of the present invention is obtained by sandwiching the water-absorbent sheet of the present invention with a liquid permeable sheet and a liquid impermeable sheet.
- a liquid permeable sheet and a liquid impermeable sheet known sheets used in the field of the present invention can be used, and a known method can be adopted as a method of sandwiching between these sheets.
- the performance of the water absorbing sheet was measured by the following method.
- a water-absorbing sheet having a strip shape of 10 ⁇ 30 cm and having a longitudinal direction cut in the longitudinal direction (machine direction) of the hydrophilic nonwoven fabric was prepared and used as a sample.
- a polyethylene air-through porous liquid permeable sheet having the same size as the sample (10 ⁇ 30 cm) and a basis weight of 22 g / m 2 was placed on the upper surface of the sample (water-absorbing sheet).
- a polyethylene liquid-impermeable sheet having the same size and weight per unit area as the sample was placed on the lower surface of the sample to produce a simple absorbent article.
- a cylindrical cylinder with an inner diameter of 3 cm is placed near the center of this absorbent article, and 50 mL of the test solution is poured into the cylinder at once, and the test solution is completely disappeared from the cylinder using a stopwatch.
- the spread of the test solution with respect to the longitudinal direction of the water absorbent sheet as a sample was measured as a diffusion length (cm).
- the leak test in the inclination was performed using the apparatus shown in FIG. As an outline, the acrylic test plate 52 is tilted and fixed by using a commercially available gantry 51 for experimental equipment, and then the test solution is put into the water absorbing sheet 53 placed on the plate from above by a dropping funnel 54. In this mechanism, the balance 55 measures the amount of the test liquid collected in the metal tray 56 placed under the acrylic plate 52 as a leakage amount. Detailed specifications are shown below.
- the acrylic plate 52 has a length of 45 cm in the direction of the inclined surface and is fixed by the gantry 51 so that the angle formed with respect to the horizontal is 45 ⁇ 2 °.
- the acrylic plate 52 had a width of 100 cm and a thickness of 1 cm, and a plurality of water absorbing sheets 53 could be measured in parallel. Since the surface of the acrylic plate 52 was smooth, liquid did not stay or be absorbed on the plate.
- the dropping funnel 54 was fixed vertically above the inclined acrylic plate 52 using the gantry 51.
- the dropping funnel 54 had a capacity of 100 mL, an inner diameter of the tip of about 4 mm ⁇ , and the cock throttle was adjusted so that the liquid was introduced at 8 mL / second.
- a balance 55 on which a metal tray 56 is placed is installed below the acrylic plate 52. All the test liquids that flowed down as a leak were received, and the mass was recorded to an accuracy of 0.1 g.
- the leak test in the inclination using such an apparatus was performed according to the following procedure.
- the mass was measured using a water-absorbing sheet 53 having a strip shape of 10 ⁇ 30 cm and having the longitudinal direction cut in the longitudinal direction (machine direction) of the hydrophilic nonwoven fabric as a sample.
- an air-through type polyethylene liquid-permeable nonwoven fabric of the same size (weight per unit area 22 g / m 2 ) is applied from above the sample, and a polyethylene liquid impervious sheet of the same size and weight per unit is applied from below.
- the simple absorbent article created in this manner was pasted on the acrylic plate 52 (the lower end of the water absorbent sheet 53 was not pasted on the acrylic plate 52 in order not to stop leakage).
- a mark was made at a location 2 cm below the upper end of the water absorbent sheet 53, and the inlet of the dropping funnel 54 was fixed so that the distance vertically above the mark was 8 ⁇ 2 mm.
- the test liquid flowed through the inclined acrylic plate 52 without being absorbed by the water-absorbing sheet 53, and the amount of liquid that entered the metal tray 56 was measured to obtain the first leakage amount (mL).
- the numerical value of the first leakage amount (mL) was LW1.
- the second and third test solutions are introduced in the same manner, and the second and third leakage amounts (mL) are measured.
- the numerical values are LW2 and LW3, respectively. did.
- the leak index was calculated according to the following formula. As the index approaches zero, the amount of leakage in the inclination of the water absorbent sheet, particularly the initial amount of leakage, is small, and it is determined that the water absorbent sheet is excellent.
- Leakage index: L LW1 ⁇ 10 + LW2 ⁇ 5 + LW3
- ⁇ Measurement of water absorption sheet thickness The thickness of the water-absorbing sheet obtained was measured using a thickness measuring instrument (manufactured by Ozaki Mfg. Co., Ltd., model number: JB). As the measurement locations, the left end, the center, and the right end are arbitrarily determined in the longitudinal direction. When the size of the water absorbent sheet is, for example, 10 ⁇ 30 cm, 3 cm from the left is the left end, 15 cm is the center, and 27 cm is the right end. In the width direction, a uniform central portion was measured.
- Measured values of thickness were measured three times at each location and averaged. Furthermore, the values of the left end, the center and the right end were averaged to obtain the thickness of the entire water absorbent sheet.
- Example 1 On a hot melt coating machine (Harrys Co., Ltd .: Marshall 150) set at a heating temperature of 150 ° C., a spunlace nonwoven fabric with a width of 30 cm (weight per unit area: 50 g / m 2 , thickness: 400 ⁇ m, rayon content: 70 %, Polyethylene terephthalate content: 30%), and a styrene-butadiene-styrene copolymer (softening point 85 ° C.) as an adhesive was applied onto the nonwoven fabric at a basis weight of 20 g / m 2 .
- a hot melt coating machine Hardrys Co., Ltd .: Marshall 150
- a sodium polyacrylate cross-linked product (Sumitomo Seika Co., Ltd .: Aquakeep SA55SX-II) as a water-absorbent resin at the inlet of a roller-type spreader (manufactured by HASHIMA CORPORATION: Sinter Ace M / C) Particle size: 360 ⁇ m; physiological saline water absorption rate: 42 seconds; physiological saline water retention capacity: 35 g / g).
- the adhesive-coated non-woven fabric was laid on a conveyor below the spreader. Subsequently, the said sodium polyacrylate crosslinked body was uniformly laminated
- the obtained laminate was sandwiched between spunlace nonwoven fabrics coated with a styrene-butadiene-styrene copolymer (softening point 85 ° C.) with a basis weight of 20 g / m 2 from the top in the same manner as described above, followed by heating temperature These were integrated by heat-sealing with a laminating machine (manufactured by HASHIMA Co., Ltd .: linear adhesive press HP-600LF) set at 100 ° C. to obtain a water-absorbent sheet intermediate A.
- a laminating machine manufactured by HASHIMA Co., Ltd .: linear adhesive press HP-600LF
- a spunlace nonwoven fabric having a width of 30 cm (weight per unit area: 50 g / m 2 , thickness: 400 ⁇ m, rayon content: 70%, polyethylene terephthalate on a hot melt coating machine set at a heating temperature of 150 ° C. Then, a styrene-butadiene-styrene copolymer (softening point 85 ° C.) as an adhesive was applied onto the nonwoven fabric at a basis weight of 6 g / m 2 .
- a sodium polyacrylate cross-linked product as a water-absorbing resin manufactured by Sumitomo Seika Co., Ltd .: Aquakeep 10SH-PB; medium particle size: 320 ⁇ m; physiological saline water absorption rate: 3 seconds; physiological saline water retention capacity: 42 g / g).
- the adhesive-coated non-woven fabric was laid on a conveyor below the spreader. Subsequently, the said sodium polyacrylate crosslinked body was uniformly laminated
- the obtained laminate was sandwiched from above with a spunlace nonwoven fabric coated with a styrene-butadiene-styrene copolymer (softening point 85 ° C.) at a basis weight of 6 g / m 2 in the same manner as described above, followed by heating temperature. These were integrated by heat-sealing with a laminating machine (manufactured by Hashima Co., Ltd .: linear adhesive press HP-600LF) set at 100 ° C. to obtain a water-absorbent sheet intermediate B.
- a laminating machine manufactured by Hashima Co., Ltd .: linear adhesive press HP-600LF
- the embossed shape having the characteristics shown in Table 1 and represented in FIG. 3 is formed on the laminated sheet.
- the wires were processed and arranged as shown.
- the linear emboss 4 was linearly applied from each top (specifically, each vertex) of the corrugated emboss 2.
- the laminated sheet is embossed by pressing them for 1 second (pressure on the wire: 38 MPa) with a hydraulic press machine (manufactured by Futako Koki Co., Ltd.) set at a heating temperature of 100 ° C. Obtained.
- various performances of the water absorbing sheet were measured. The results are shown in Table 2.
- Example 2 to 7 Each of the performances was measured after obtaining a water-absorbing sheet by the same method as in Example 1 except that each had the characteristics shown in Table 1 and the embossed shape shown in FIGS. 4 to 15 was applied. . The results are shown in Table 2.
- Example 1 there is one corrugated embossing, and a water-absorbing sheet formed with linear or curved linear embossing one by one from each apex (vertex) has a higher evaluation. Obtained.
- the water absorbent sheet of the present invention has a high liquid permeation rate and does not cause liquid leakage, and can be suitably used for absorbent articles such as diapers.
Abstract
Description
〔1〕 少なくとも吸水性樹脂を含む吸収層が、2枚以上の親水性不織布により狭持された構造を有する吸水シートであって、
吸水シート1の長手方向の中央領域W1に、長手方向に延びる一本又は複数本の連続した互いに重ならない波型エンボス2、及び波型エンボス2により形成される波形状の各頂部3から、吸水シート1の長手方向に沿った端部に向かう線状エンボス4が施されてなり、かつ波型エンボス2と線状エンボス4とにより形成されるエンボスの分岐構造が略Y字形を有し、
吸水シート1の長手方向に沿った端部には、当該長手方向に延びる、エンボスが施されないノンエンボス領域W2及びW2’が設けられてなり、さらに
吸水シート1に施されるエンボスの面積率が当該吸水シート1の全面積の3~25%である、吸水シート;並びに
〔2〕 前記〔1〕に記載の吸水シートを、液体透過性シート及び液体不透過性シートで狭持してなる、吸収性物品;に関するものである。
吸水シートを10×30cmの短冊状で、長手方向が親水性不織布の縦方向(機械方向)となるように切断したもの用意し、これをサンプルとして使用した。
逆戻り量(g)=Wb-Wa
傾斜における漏れ試験は、図2に示す装置を用いて行った。
概略としては、市販の実験設備用の架台51を用いて、アクリル板52を傾斜させて固定した後、板上に載置した吸水シート53に鉛直上方から滴下ロート54で前記の試験液を投入し、アクリル板52の下部に載置した金属製トレイ56に溜まる試験液の量を漏れ量として天秤55で計量する機構である。以下に詳細な仕様を示す。
漏れ指数:L=LW1×10+LW2×5+LW3
得られた吸水シートの厚みは、厚み測定器(株式会社尾崎製作所社製、型番:J-B)を用いて測定した。測定箇所として、長手方向に左端、中央、右端の3箇所を任意に決め、吸水シートの大きさが例えば10×30cmの場合、左から3cmを左端、15cmを中央、27cmを右端とした。幅方向は均等な中央部を測定した。
上記の分析の結果を元に、吸水シートとしての総合評価を行った。
S:吸水シートとして非常に優れている。
A:吸水シートとして優れている。
B:吸水シートとして、実用するには問題がある。
C:吸水シートとして、性能が劣り、実用できない。
加熱温度を150℃に設定したホットメルト塗工機(株式会社ハリーズ製:マーシャル150)上に、幅30cmのスパンレース不織布(目付量:50g/m2、厚さ:400μm、レーヨン含有率:70%、ポリエチレンテレフタレート含有率:30%)を敷いた後、接着剤としてスチレン-ブタジエン-スチレン共重合体(軟化点85℃)を目付量20g/m2で当該不織布上に塗布した。
積層シートにエンボス加工を施さない以外は、実施例1と同様の方法によって、吸水シートを得た後、各種性能を測定した。結果を表2に示す。
それぞれ、表1に示すような特性を有し、かつ図4~図15に示すエンボス形状を施した以外は、実施例1と同様の方法によって、吸水シートを得た後、各種性能を測定した。結果を表2に示す。
吸水性樹脂としてのポリアクリル酸ナトリウム架橋体(住友精化株式会社製:アクアキープSA55SX-II;中位粒径:360μm;生理食塩水吸水速度:42秒;生理食塩水保水能:35g/g)7.5gと粉砕パルプ7.5gを乾式混合した。得られた混合物を、大きさが10cm×30cmで重さが0.75gのティッシュに吹き付けた後、同じ大きさ及び重さのティッシュを重ねてシート状にし、これの全体に196kPaの荷重を30秒間加えてプレスすることにより、吸収体を得た。この吸収体について、各種性能を測定した。結果を表2に示す。
2 波型エンボス
3 頂部
4 線状エンボス
51 架台
52 アクリル板
53 吸水シート
54 滴下ロート
55 天秤
56 金属製トレイ
W1 中央領域
W2 ノンエンボス領域
W2’ ノンエンボス領域
Claims (4)
- 少なくとも吸水性樹脂を含む吸収層が、2枚以上の親水性不織布により狭持された構造を有する吸水シートであって、
吸水シート(1)の長手方向の中央領域(W1)に、長手方向に延びる一本又は複数本の連続した互いに重ならない波型エンボス(2)、及び波型エンボス(2)により形成される波形状の各頂部(3)から、吸水シート(1)の長手方向に沿った端部に向かう線状エンボス(4)が施されてなり、かつ波型エンボス(2)と線状エンボス(4)とにより形成されるエンボスの分岐構造が略Y字形を有し、
吸水シート(1)の長手方向に沿った端部には、該長手方向に延びる、エンボスが施されないノンエンボス領域(W2、W2’)が設けられてなり、さらに
吸水シート(1)に施されるエンボスの面積率が該吸水シート(1)の全面積の3~25%である、吸水シート。 - 中央領域(W1)の幅が、吸水シート(1)の全幅に対し0.15~0.45倍の範囲である、請求項1に記載の吸水シート。
- ノンエンボス領域(W2、W2’)の各々の幅が、吸水シート(1)の全幅に対し0.05~0.20倍の範囲である、請求項1又は2に記載の吸水シート。
- 請求項1~3のいずれか1項に記載の吸水シートを、液体透過性シート及び液体不透過性シートで狭持してなる、吸収性物品。
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2010231789A AU2010231789B2 (en) | 2009-03-31 | 2010-03-25 | Water-absorbent sheet |
KR1020117023770A KR101661788B1 (ko) | 2009-03-31 | 2010-03-25 | 흡수 시트 |
PL10758527T PL2415439T3 (pl) | 2009-03-31 | 2010-03-25 | Arkusz wodochłonny |
US13/259,776 US20120029456A1 (en) | 2009-03-31 | 2010-03-25 | Water-absorbent sheet |
DK10758527.5T DK2415439T3 (en) | 2009-03-31 | 2010-03-25 | water-absorbing film |
CN201080014606.0A CN102378614B (zh) | 2009-03-31 | 2010-03-25 | 吸水片材 |
ES10758527.5T ES2529218T3 (es) | 2009-03-31 | 2010-03-25 | Lámina absorbente de agua |
EP10758527.5A EP2415439B1 (en) | 2009-03-31 | 2010-03-25 | Water-absorbent sheet |
JP2011507128A JP5337869B2 (ja) | 2009-03-31 | 2010-03-25 | 吸水シート |
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JP2009-085432 | 2009-03-31 |
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WO2010113754A1 true WO2010113754A1 (ja) | 2010-10-07 |
Family
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PCT/JP2010/055221 WO2010113754A1 (ja) | 2009-03-31 | 2010-03-25 | 吸水シート |
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US (1) | US20120029456A1 (ja) |
EP (1) | EP2415439B1 (ja) |
JP (1) | JP5337869B2 (ja) |
KR (1) | KR101661788B1 (ja) |
CN (1) | CN102378614B (ja) |
AU (1) | AU2010231789B2 (ja) |
DK (1) | DK2415439T3 (ja) |
ES (1) | ES2529218T3 (ja) |
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US9132048B2 (en) | 2010-09-28 | 2015-09-15 | Sumitomo Seika Chemicals Co., Ltd. | Water-absorbent sheet structure |
JP6008623B2 (ja) * | 2012-07-06 | 2016-10-19 | ユニ・チャーム株式会社 | ペット用吸収性シート |
US9566198B2 (en) | 2013-03-15 | 2017-02-14 | Dsg Technology Holdings Ltd. | Method of making an absorbent composite and absorbent articles employing the same |
US9789014B2 (en) | 2013-03-15 | 2017-10-17 | Dsg Technology Holdings Ltd. | Method of making an absorbent composite and absorbent articles employing the same |
MY181416A (en) | 2013-07-03 | 2020-12-21 | Dsg Technology Holdings Ltd | An absorbent composite, an absorbent article employing the same, and methods, systems, and apparatus for making the absorbent composite and/or article |
JP6502449B1 (ja) * | 2017-09-29 | 2019-04-17 | 大王製紙株式会社 | 吸収シート及び吸収シートを含む使い捨て着用物品 |
WO2019183592A2 (en) | 2018-03-22 | 2019-09-26 | Dsg Technology Holdings Ltd. | Disposable absorbent article and absorbent core composite or construction for incorporation therewith, components tehrefor or thereof, and systems, apparatus and methods of making the same |
JP6681493B1 (ja) * | 2018-12-12 | 2020-04-15 | 住友精化株式会社 | 吸水性樹脂粒子の液体漏れ性を評価する方法、及び吸水性樹脂粒子 |
CN110552246B (zh) * | 2019-09-09 | 2022-04-15 | 泰盛科技(集团)股份有限公司 | 一种生活用纸 |
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KR20120010233A (ko) | 2012-02-02 |
JPWO2010113754A1 (ja) | 2012-10-11 |
DK2415439T3 (en) | 2014-12-08 |
EP2415439B1 (en) | 2014-11-19 |
ES2529218T3 (es) | 2015-02-18 |
JP5337869B2 (ja) | 2013-11-06 |
CN102378614A (zh) | 2012-03-14 |
CN102378614B (zh) | 2014-07-23 |
EP2415439A1 (en) | 2012-02-08 |
EP2415439A4 (en) | 2013-01-16 |
PL2415439T3 (pl) | 2015-04-30 |
AU2010231789A1 (en) | 2011-10-13 |
US20120029456A1 (en) | 2012-02-02 |
KR101661788B1 (ko) | 2016-09-30 |
AU2010231789B2 (en) | 2015-01-22 |
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