WO2021107028A1 - 吸収性物品 - Google Patents
吸収性物品 Download PDFInfo
- Publication number
- WO2021107028A1 WO2021107028A1 PCT/JP2020/044060 JP2020044060W WO2021107028A1 WO 2021107028 A1 WO2021107028 A1 WO 2021107028A1 JP 2020044060 W JP2020044060 W JP 2020044060W WO 2021107028 A1 WO2021107028 A1 WO 2021107028A1
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- WO
- WIPO (PCT)
- Prior art keywords
- absorbent
- fiber
- absorbent article
- water
- fibers
- Prior art date
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
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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
- A61F13/534—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
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- 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
- A61F13/536—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 having discontinuous areas of compression
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- A61F13/00—Bandages or dressings; Absorbent pads
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- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530131—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp
- A61F2013/530343—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp being natural fibres
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- A61F13/00—Bandages or dressings; Absorbent pads
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- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
- A61F2013/53051—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
- A61F2013/530525—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged the maximum being at front or rear
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- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
- A61F2013/530583—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the form
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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
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
- A61F2013/5307—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the quantity or ratio of superabsorbent material
Definitions
- the present invention relates to an absorbent article.
- a sanitary napkin that absorbs excrement such as menstrual blood.
- Such sanitary napkins include an absorber (absorbent core), which contains water-retaining (water-absorbent) fibers and a highly absorbent polymer such as SAP.
- SAP water-retaining polymer
- Patent Document 1 discloses an absorber that facilitates swelling of SAP by defining an interfiber distance so that a gap that allows SAP to swell is formed inside the absorber.
- the present invention has been made in view of the above problems, and an object of the present invention is to enhance water absorption in an absorber containing a highly absorbent polymer (SAP).
- SAP highly absorbent polymer
- the main invention for achieving the above object is an absorbent article having an absorbent core having a longitudinal direction, a width direction and a thickness direction orthogonal to each other and having fibers and a highly absorbent polymer.
- the average value of the fiber length is larger than the average value of the diameters of the highly absorbent polymer in the state of not being immersed in the physiological saline, and after soaking in the physiological saline for 60 minutes, draining is performed for 15 minutes.
- water absorption can be enhanced in an absorber containing a highly absorbent polymer (SAP).
- SAP highly absorbent polymer
- An absorbent article having an absorbent core having a longitudinal direction, a width direction and a thickness direction orthogonal to each other and having fibers and a highly absorbent polymer, wherein the average value of the lengths of the fibers is physiological saline.
- the diameter of the highly absorbent polymer which is larger than the average diameter of the highly absorbent polymer when not immersed in water, is larger than the average value of the diameter of the highly absorbent polymer after being immersed in the physiological saline for 60 minutes and then drained for 15 minutes.
- An absorbent article characterized by being smaller than the average value.
- the fiber length is shorter and the number of entangled points between the fibers is smaller than in the conventional case, so that the highly absorbent polymer (SAP) absorbs water (saline).
- SAP highly absorbent polymer
- the fibers swell, the entanglement between the fibers is easily broken, and the SAP can absorb water up to the limit capacity and swell. Therefore, the absorbency of the absorber (absorbent core) containing SAP can be improved.
- the average value of the fiber length is the highly absorbent polymer in a state of being immersed in the physiological saline for 60 minutes, drained for 15 minutes, and then dehydrated by a centrifuge. It is desirable that it is smaller than the average value of the diameter of.
- the absorbent article contains water-absorbent fibers.
- an absorbent article it is possible to absorb water (physiological saline) not only with SAP but also with water-absorbent fibers, so that the absorbency of the absorber (absorbable core) can be further enhanced. .. Further, since high absorbency is easily ensured even when the total amount of fibers is small, it is possible to form the absorber thinly while improving the absorbency of the absorber.
- the absorbent article contains a broad-leaved water-absorbent fiber made of a broad-leaved tree.
- hardwood water-absorbent fibers have a short average fiber length, so that the fibers are less likely to be entangled with each other. That is, since the number of entangled points formed per fiber is reduced, the entangled points are easily peeled off when the SAP swells. Further, since the hardwood water-absorbent fiber is thin and thin, the area of the entanglement point is small even if the fibers are entangled with each other, and it is easy to peel off even with a weak force. Therefore, when the SAP swells, it is unlikely that the entanglement of the fibers will prevent the SAP from swelling. Therefore, SAP can absorb water up to the limit capacity that can be absorbed and swell. Thereby, the absorbability of the absorber can be further enhanced.
- the saturation amount of the physiological saline solution that can be retained by the highly absorbent polymer is 10 times or more the weight of the highly absorbent polymer in a state of not being immersed in the physiological saline solution, 120. It is desirable that it is not more than double.
- the average diameter of SAP before swelling is shorter than the average length of fibers, and the average diameter of SAP after swelling. Can be increased in probability that is shorter than the average length of the fibers. As a result, it becomes difficult for SAP to fall off from the absorber before swelling, and after swelling, it is possible to easily absorb water up to the limit capacity that SAP can absorb by removing the entanglement between the fibers.
- the average diameter of the highly absorbent polymer in such an absorbent article when not immersed in the physiological saline solution is 250 ⁇ m or more and 600 ⁇ m or less.
- the average diameter of SAP before swelling is shorter than the average length of fibers, and SAP after swelling. It is possible to increase the probability that the average diameter of the fibers will be shorter than the average length of the fibers. As a result, it becomes difficult for SAP to fall off from the absorber before swelling, and after swelling, it is possible to easily absorb water up to the limit capacity that SAP can absorb by removing the entanglement between the fibers.
- the average density of the absorbent core is 0.04 g / cm 3 or more and 0.3 g / cm 3 or less.
- the absorbent core is maintained at an appropriate softness and is not easily twisted. can do.
- the average density of the absorbent core is 0.17 g / cm 3 or more.
- the average density of the absorbent core is 0.17 g / cm 3 or more
- the shape of the absorbent core is less likely to be lost, and it is possible to easily suppress the leakage of excretion. ..
- the average density of the absorbent core is 0.17 g / cm 3 or more in the region (the central region in the width direction and the longitudinal direction) that comes into contact with the wearer's excretion port when wearing the absorbent article, menstrual blood, etc. Even when the excrement of the above is repeatedly absorbed, the absorber is less likely to be twisted. This makes it easier to maintain good fit and absorbency.
- the absorbent core has a density higher than the average density of the absorbent core and contains a fiber mass in which the fibers are densely packed, and the absorbent core is at least one said fiber. It is desirable to have a low density portion having a fiber density lower than that of the fiber mass on one side or the other side of the mass in the thickness direction.
- the high-density fiber mass is dispersed inside the absorbent core at least in the thickness direction, so that the water absorbed by the absorbent core is a capillary phenomenon. It is attracted from the low density part to the high density part (fiber mass) and easily held. Therefore, it becomes easy to absorb and retain the water content of the absorbent core as a whole, and the absorbability of the absorbent core can be enhanced.
- the proportion of the highly absorbent polymer in contact with the fiber mass in such an absorbent article is larger than the proportion of the highly absorbent polymer not in contact with the fiber mass.
- the absorbency of the absorbent core can be improved by increasing the proportion of the highly absorbent polymer in contact with the fiber mass to be greater than the proportion of the highly absorbent polymer not in contact with the fiber mass.
- the proportion of the highly absorbent polymer in contact with the fiber mass in such an absorbent article is smaller than the proportion of the highly absorbent polymer not in contact with the fiber mass.
- the absorbent core contains a fiber mass having a density lower than the average density of the absorbent core.
- a low density portion is formed in the absorbent core due to the inclusion of the low density fiber mass, and when the high density polymer absorbs water in the low density portion, the low density portion is formed. It becomes easy to swell. Therefore, the absorbency of the absorbable core can be enhanced. Further, by including such a fiber mass, the flexibility and cushioning property of the absorbent core are enhanced, and the fit when the absorbent article is worn can be improved.
- the highly absorbent polymer has a spherical outer shape as such an absorbent article.
- the highly absorbent polymer is such an absorbent article and has corners on its surface.
- the highly absorbent polymer is less likely to be caught on a fiber having a short fiber length, and swelling is less likely to be inhibited when the highly absorbent polymer absorbs water. This makes it easier for the highly absorbent polymer to absorb moisture and enhances the absorbency of the absorbent core.
- the absorbent core has a vaginal opening contact area which is a region in contact with the wearer's vaginal opening when the absorbent article is worn, and the said in the vaginal opening contact area. It is desirable that the content of the highly absorbent polymer is larger than the content of the highly absorbent polymer in the region other than the vaginal opening contact region.
- the content of the highly absorbent polymer in the skin-side portion when the absorbent core is bisected in the thickness direction is such that the absorbent core is bisected in the thickness direction. It is desirable that the content is larger than the content of the highly absorbent polymer in the non-skin side portion when divided.
- the water absorbency on the skin side in the thickness direction of the absorbent core can be made higher than that on the non-skin side. Therefore, when the absorbent article is worn, the moisture between the wearer's skin and the absorbent core is easily absorbed by the highly absorbent polymer, and the skin side surface of the absorbent article can be made less stuffy. This makes it less likely to cause discomfort to the wearer.
- the content of the highly absorbent polymer in the skin-side portion when the absorbent core is bisected in the thickness direction is such that the absorbent core is bisected in the thickness direction. It is desirable that the content of the highly absorbent polymer in the non-skin side portion when divided is equal to or less than that.
- the fiber contains a broad-leaved water-absorbent fiber made of a broad-leaved tree, and the average fiber width of the broad-leaved water-absorbent fiber is 15 ⁇ m or less, and per unit area of the absorbent core. It is desirable that the number of the broad-leaved water-absorbent fibers contained is 300 fibers / mm 2 or more and less than 2500 fibers / mm 2 , and a highly absorbent polymer is provided between the plurality of the broad-leaved tree water-absorbent fibers. ..
- the fibers are hard to be entangled and the hardwood pulp having a narrow fiber width is densely packed, so that the probability of contact between the excrement liquid and the fibers is high.
- the probability that multiple hardwood pulps come into contact with SAP is high, the excrement liquid contained in the hardwood pulp is easily drawn into the highly absorbent polymer between the hardwood pulps, and the excrement liquid is absorbed multiple times. It is also possible to reduce the liquid return.
- the fiber contains a broad-leaved water-absorbent fiber made of a broad-leaved tree, the standard deviation of the fiber length of the broad-leaved water-absorbent fiber is 0.27 or less, and the broad-leaved water-absorbent fiber. It is desirable that the standard deviation of the fiber width of is 7.55 or less.
- the value obtained by adding the standard deviation of the fiber length of the broadleaf tree water-absorbent fiber to the average fiber length of the broadleaf tree water-absorbent fiber is twice the average fiber length of the broadleaf tree water-absorbent fiber.
- the value obtained by subtracting the standard deviation of the fiber length of the broadleaf tree water-absorbent fiber from the average fiber length of the broadleaf tree water-absorbent fiber is 1 ⁇ 2 of the average fiber length of the broadleaf tree water-absorbent fiber. Is also desirable.
- the fiber is less biased and the excrement liquid can be easily diffused evenly.
- the fiber contains a broad-leaved water-absorbent fiber made of a broad-leaved tree, the absorbent core contains a plurality of thermoplastic fibers, and the absorbent core is included in the thickness direction of the absorbent core. It is desirable that the squeezed portion is integrally squeezed, and the thermoplastic fibers are fused to each other in the squeezed portion.
- the shape of the absorber can be easily stabilized by fusing the thermoplastic fibers to each other. As a result, even when the wearer moves his / her body significantly while wearing the absorbent article, it becomes easy to prevent the absorber from losing its shape or deteriorating the water absorption.
- sanitary napkin 1 (hereinafter, also simply referred to as “napkin 1”) will be described.
- a sanitary napkin will be described as an example of an absorbent article, but the absorbent article of the present embodiment also includes a so-called vaginal discharge sheet (for example, panty liner), a light incontinence pad, and the like. It is not limited to sanitary napkins.
- FIG. 1 is a schematic plan view of the napkin 1 as viewed from the skin side in the thickness direction.
- FIG. 2 is a schematic cross section shown by arrow AA in FIG. Further, in the following description, each direction is defined as shown in FIGS. 1 and 2. That is, the "longitudinal direction" along the product longitudinal direction of the napkin 1, the “width direction” orthogonal to the longitudinal direction along the product short direction of the napkin 1, and the “thickness” orthogonal to the longitudinal direction and the width direction, respectively. "Direction" is defined.
- the direction that is the ventral side of the wearer when the napkin 1 is used is defined as the "front side”
- the direction that is the dorsal side of the wearer is defined as the “rear side”.
- the side that comes into contact with the wearer's skin when the napkin 1 is worn is referred to as the “skin side (upper side)”
- the opposite side is referred to as the “non-skin side (lower side)”.
- the napkin 1 is a vertically elongated sheet-like member in a plan view, and is a pair of side sheets 2, a top sheet 3, a second sheet 4, an absorber 10 (absorbent core), a cover sheet 6, and a back sheet 5. And are laminated in order from the skin side to the non-skin side in the thickness direction (see FIG. 2).
- Each of these members is joined to a member adjacent to each other in the thickness direction with an adhesive such as a hot melt adhesive (HMA).
- HMA hot melt adhesive
- Examples of the adhesive application pattern include an ⁇ pattern, a spiral pattern, and a stripe pattern.
- the napkin 1 has a napkin main body 20 provided with an absorber 10 and a pair of wing portions 30 extending outward from the central region in the longitudinal direction of the napkin main body 20 in the width direction.
- the central region in the longitudinal direction in which the wing portion 30 is provided is a region that comes into contact with the wearer's excretion port (lower crotch) when the napkin 1 is used.
- the top sheet 3 is a member that comes into contact with the wearer's skin when the napkin 1 is used, and allows liquids such as menstrual blood to permeate from the skin side to the non-skin side in the thickness direction and move to the absorber 10. Therefore, as the top sheet 3, an appropriate liquid-permeable flexible sheet such as an air-through non-woven fabric is used.
- the second sheet 4 is a liquid permeable sheet, and the same air-through non-woven fabric as the top sheet 3 can be exemplified.
- the second sheet 4 is provided on the skin side surface of the absorber 10 and plays a role of preventing the reversion of excrement such as menstrual blood, improving the diffusion of excrement, and improving the cushioning property.
- the napkin 1 does not have to have the second sheet 4.
- the cover sheet 6 may be a liquid-permeable sheet or a liquid-impermeable sheet, and examples thereof include tissue paper, SMS (spun bond / melt blown / spun bond) non-woven fabric, and the like.
- the cover sheet 6 is provided between the absorber 10 and the back sheet 5. However, the napkin 1 does not have to have the cover sheet 6.
- the back sheet 5 prevents the liquid that has passed through the top sheet 3 and absorbed by the absorber 10 from seeping out to the clothing side (non-skin side) such as underwear when the napkin 1 is used.
- an appropriate liquid-impermeable flexible sheet such as a polyethylene (PE) resin film is used.
- PE polyethylene
- the side sheet 2 may be a liquid-permeable sheet or a liquid-impermeable sheet, and examples thereof include the same air-through non-woven fabric and SMS non-woven fabric as the top sheet 3.
- the outer peripheral edges of the side sheet 2 and the top sheet 3 and the back sheet 5 are bonded to each other by adhesion or fusion, so that the absorber 10 is between the sheets. Is held. Further, the pair of side seats 2 extend from both side portions in the width direction of the top sheet 3 to the outside in the width direction, and form a pair of wing portions 30 together with the back seat 5.
- Absorber 10 (corresponding to an absorbent core) is a vertically long member that is long along the longitudinal direction, and absorbs liquid (excrement) such as menstrual blood and holds it inside. Details of the absorber 10 will be described later.
- the second sheet 4, the absorber 10, and the cover sheet 6 have the same planar shape and are laminated in the thickness direction.
- the respective members are bonded to each other by a hot melt adhesive (HMA), but they may not be bonded to each other.
- HMA hot melt adhesive
- the napkin 1 is provided with a plurality of squeezed portions 40 (recesses) (see FIG. 1).
- the squeezed portion 40 is a portion recessed from the skin side to the non-skin side in the thickness direction, and is a portion having a higher fiber density than an adjacent portion.
- the squeezed portion 40 at least the entire area of the top sheet 3, the second sheet 4, and the absorber 10 in the thickness direction is squeezed (embossed) from the skin side in the thickness direction and joined and integrated. This makes it difficult for the napkin 1 to twist.
- the squeezing portion 40 is provided only on the absorber 10, the squeezing portion 40 is provided only from the top sheet 3 to a part of the absorber 10 on the skin side in the thickness direction, or from the back sheet 5.
- the squeezing portion 40 may be provided on the absorber 10. Further, the arrangement pattern of the squeezing portion 40 is not limited to that shown in FIG.
- the absorber 10 has a water-absorbent fiber that absorbs a liquid, and is formed into a vertically elongated shape in a plan view. Further, the absorber 10 may contain a material other than the water-absorbent fiber (for example, a hydrophobic fiber such as a thermoplastic resin fiber). When it has a water-absorbent fiber and a thermoplastic resin fiber (hydrophobic fiber), the absorber 10 is formed in a state where these fibers are mixed with each other.
- a material other than the water-absorbent fiber for example, a hydrophobic fiber such as a thermoplastic resin fiber.
- pulp for example, wood pulp obtained from coniferous or broadleaf tree, non-wood pulp such as bagas, kenaf, bamboo, hemp, cotton (for example, cotton linter); recycled cellulose fiber such as rayon fiber; Examples thereof include semi-synthetic fibers such as acetate fibers.
- softwood water-absorbent fiber also referred to as softwood pulp
- softwood pulp which is a water-absorbent fiber made of softwood
- the absorber 10 of the present embodiment at least a part of the water-absorbent fibers contains hardwood water-absorbent fibers (hardwood pulp) which are water-absorbent fibers made of hardwood.
- This hardwood water-absorbent fiber has a feature that the fiber length is shorter than that of a water-absorbent fiber made of softwood (coniferous pulp).
- FIG. 3A is a diagram showing the distribution of fiber lengths of hardwood water-absorbent fibers (hardwood pulp) and softwood water-absorbent fibers (softwood pulp).
- the horizontal axis shows the fiber length (mm), and the vertical axis shows the frequency (%).
- the average fiber length of softwood pulp is 2.5 mm, and the distribution width of the fiber length is wide (fibers of 3 mm or more are included. The standard deviation is 1.6).
- the average fiber length of hardwood water-absorbent fibers is 0.79 mm, and the distribution width of the fiber lengths is narrow (standard deviation is 0.27).
- the average fiber length of the pulp fiber means the length-weighted average fiber length L (l) as measured by the center line fiber length (Cont).
- the length-weighted average fiber length is measured as an L (l) value by Kajaani FiberLab Fiber Properties (offline) [kajaaniFiberLab fiber products (off-line)] manufactured by metso automation. This is also the method recommended by JIS P 8226-2 (a method for measuring fiber length by pulp-engineering automatic analysis method, which conforms to the non-polarized method).
- the average fiber width of the pulp fibers described below is measured as Fiber Witdh.
- the average fiber length and average fiber width are measured excluding fiber lumps as described in the JIS evaluation method. Therefore, the data of the average fiber length and the average fiber width shown in the present specification are the results measured excluding the fiber mass described later.
- the average fiber length of fibers other than pulp fibers is the glass with the scale of "A7.1.1 A method (standard method)" in “A7.1 Fiber length measurement” of Annex A of JIS L 1015: 2010. Measure according to "Method of measuring the length of individual fibers on a plate”. The above method is a test method corresponding to ISO 6989 published in 1981.
- thermoplastic resin fiber examples include a single fiber made of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc., a fiber obtained by polymerizing PP and PE, or PP and PE.
- examples thereof include composite fibers having a core-sheath structure composed of.
- the degree of crimping can be adjusted.
- the fiber can be crimped by using a core-sheath type or eccentric type composite fiber composed of two synthetic fiber components having different melting points as the thermoplastic resin fiber.
- the average fiber length of the thermoplastic resin fiber is about 30 mm.
- the average number of crimps per unit length of the thermoplastic resin fiber is set to be smaller than the average number of crimps per unit length of the water-absorbent fiber.
- the entanglement between the thermoplastic resin fiber and the water-absorbent fiber is reduced, and the folding habit is less likely to remain. Therefore, even when the thermoplastic resin fiber is contained, the wearing feeling can be improved and the leakage prevention property can be improved.
- a method for measuring the average number of crimps for example, a plurality of test pieces (for example, 5 cm square test pieces) are sampled in the width direction, and a Keyence microscope VH-Z450 or the like is used in the test pieces.
- the number of crimps per inch (2.54 cm) may be measured several times with no load applied to the fibers.
- the number of crimps (average number of crimps per unit length) can be calculated from the average value.
- FIG. 3B is a diagram showing the distribution of average fiber widths of hardwood pulp and softwood pulp.
- the horizontal axis shows the fiber width ( ⁇ m), and the vertical axis shows the frequency (%).
- the average fiber width of softwood pulp is about 30 ⁇ mm (upper figure), and the distribution width of the fiber width is wide (standard deviation is 11.9).
- the average fiber width of hardwood pulp is about 15 ⁇ m (see the figure below), and the distribution width of the fiber width is narrow (standard deviation is 7.55).
- the average fiber width of the water-retaining fibers is shorter than that in the case where only softwood pulp is used.
- the average fiber width of the hardwood pulp is 15 ⁇ m or less, the number of fiber densities is 300 / mm 2 or more and less than 2500 / mm 2 (details will be described later), and the highly absorbent polymer between the hardwood pulps. It is desirable to have. Then, since the fibers are short and the fibers are thin, the absolute fiber area is small, so that the fibers are difficult to entangle, and the broadleaf pulp, which is characterized by a short fiber width, is densely packed, so that the excrement fluid and the fibers come into contact with each other.
- the absorber 10 may contain fibers other than the above, and may contain natural fibers such as cellulose, semi-synthetic fibers such as rayon and acetate, and the like.
- the thickness of the absorber 10 is 2 mm or more and 10 mm or more. If the thickness of the absorber 10 is less than 2 mm, it is too thin and twisted, and if it exceeds 10 mm, it is too hard and the wearer may feel uncomfortable.
- the fiber number density of hardwood pulp is larger than that of softwood pulp when compared under the same density condition.
- the fiber number density corresponds to the average number of fibers per unit area, and is a value obtained by calculating the number of fibers included per unit area in the case of a finely packed structure by the fiber thickness + the average distance between fibers. .. Looking at these estimated values, the fiber number density of hardwood pulp is 1182.2 fibers / mm 2, which is about 6 times the fiber number density of softwood pulp (200.3 fibers / mm 2). Therefore, when hardwood pulp is used, the density can be increased as compared with the case where softwood pulp is used.
- Fiber number density is desirably 2500 lines / mm less than 2 300 lines / mm 2 or more. If the fiber number density is less than 300 fibers / mm 2 , folding habits are less likely to remain, but the absorber 10 becomes faint and twists during use, resulting in a decrease in the absorber area and easy leakage. .. If the fiber density is 2500 fibers / mm 2 or more, the absorber 10 will be too hard and the finish will be too hard, and the feeling of discomfort during use will increase. If the number of fibers density 300 lines / mm 2 or more 2,500 / mm 2 under a, it is possible to enhance the capillary effect, also it allows thinner and softening, it is possible to enhance the absorbency.
- the absorber 10 contains liquid-absorbing granules such as a highly absorbent polymer.
- a highly absorbent polymer for example, a so-called “SAP (Super absorbent polymer)" such as a polymer of acrylic acid can be used.
- SAP Super absorbent polymer
- FIG. 4 is a diagram for explaining a method of manufacturing the absorber 10.
- the absorber 10 includes a water-retaining fiber, a thermoplastic resin fiber, and a highly absorbent polymer (SAP) will be described.
- the rotating drum 70 is a hollow cylindrical drum, and a plurality of recesses 71 are formed at a predetermined pitch as a mold for filling an absorber material on the peripheral surface.
- the absorber material supplied from the material supply section 80 is deposited (accumulated) in the recess 71 by the suction of the suction section 72.
- the material supply unit 80 with the hood 80a is formed so as to cover the upper part of the rotating drum 70, and the material supply unit 80 is a crushed pulp (coniferous pulp, hardwood pulp) obtained by crushing a pulp sheet with a crusher (not shown). ) And the thermoplastic resin are supplied to the recess 71 by air transportation. Further, the material supply unit 80 includes a particle supply unit 81 for supplying superabsorbent polymer particles, and supplies superabsorbent polymer particles to the recess 71. The mixture of the water-absorbent fiber and the thermoplastic resin fiber and the superabsorbent polymer particles are deposited in the recess 71 in a mixed state, and the absorber 10 is formed in the recess 71.
- the absorber 10 When the recess 71 accommodating the absorber 10 reaches the bottom of the drum due to the further rotation of the rotating drum 70, the absorber 10 is disengaged from the recess 71 and is placed on a base material (cover sheet 6 or the like) conveyed by the conveyor. Will be placed in and handed over to the next process.
- the pulp sheet When crushing the pulp sheet with a crusher, the pulp sheet may not be crushed completely and the fibers may remain in a ball shape. As a result, fiber lumps (also referred to as high-density portions) in which pulp is densely packed in a fluff shape are scattered in the absorber 10.
- the fiber density is higher in the central portion in the thickness direction than in the end portions on both sides in the thickness direction. Since the high-density portion and the low-density portion are provided in the thickness direction of the absorber 10, the high-density portion is continuous in the thickness direction as in the squeezed portion 40, for example, as compared with the case where the high-density portion is continuous in the thickness direction.
- the bulk (thickness) of the absorber 10 is easily maintained, and the absorber 10 which is soft and has a high cushioning property can be realized.
- hardwood pulp has an average fiber width of about 15 ⁇ m. That is, hardwood pulp is characterized not only by having a short fiber length but also by being thin. Therefore, hardwood pulp has a small cross-sectional area and volume of each fiber, fibers are more likely to be aggregated in a pill shape, and the amount of fibers contained in the pill is larger than that of softwood.
- pulp is cellulose, it is difficult to heat-seal. Therefore, it is also difficult to form a fiber mass by using a method such as heat fusion.
- the absorber 10 is defined by defining the relationship between the average fiber length (0.79 mm) of the fibers contained in the absorber 10 and the diameter of the SAP before and after absorbing water and swelling. Inside, the swelling of SAP is less likely to be hindered.
- FIG. 5 is a table showing changes in the SAP diameter when the SAP is inflated at a predetermined water absorption / retention ratio.
- the SAP particle size shown at the left end represents the SAP particle size before swelling
- the SAP diameter shown on the right side is the SAP after swelling according to the water supply ratio (water retention ratio).
- the "water absorption ratio” refers to a value obtained by dividing the saturation amount of water that can be absorbed and retained by a water absorption medium such as SAP by the weight of the water absorption medium before water absorption.
- the “water retention ratio” is the value obtained by dividing the amount of water that can be retained after the water absorbed by a water absorption medium such as SAP is dissipated (dehydrated) by the weight of the water absorption medium before water absorption.
- the measurement of the water absorption ratio (water retention ratio) of SAP was performed according to the following procedure with reference to "JIS K 7223-1996 Water absorption test method for high water absorption resin".
- the SAP to be measured is prepared under the conditions of temperature: 20 ° C., relative humidity: 60%, pressure (standard air pressure): 1 atm (101.325 kPa) (for example, in a laboratory maintained under the conditions).
- pressure standard air pressure
- 1 atm 101.325 kPa
- nylon net bag for example, two 200 mm ⁇ 200 mm square nylon nets are superposed, and the three sides of the square are heat-sealed at a position 5 mm from the edge of the nylon net, and only one side of the square is opened.
- a bag-shaped product can be used.
- the nylon net for example, a 250 mesh nylon net (N-No. 250HD) manufactured by NBC Industries can be used.
- the physiological saline used is adjusted to 3000.0 g by adding ion-exchanged water to 27.0 g of sodium chloride (reagent first grade) after placing a 3 liter beaker on an electronic balance and resetting to zero, and sodium chloride is dissolved. It was stirred with a stir bar until it was visible.
- the nylon bag containing SAP After leaving it for 60 minutes, the nylon bag containing SAP is lifted from the beaker, and the upper center of the nylon bag (for example, 5 mm from the top of the nylon bag and 50 mm from both ends) is sandwiched between clothespins and suspended in the air. Leave it down for 15 minutes to drain. Then, after 15 minutes, the weight of the nylon bag containing SAP is measured. This experiment is repeated a plurality of times (for example, 5 times), and the average value of the measured weights is defined as the water absorption weight B.
- the drained nylon bag (SAP) is dehydrated using a centrifuge (HI30) manufactured by Kokusan Co., Ltd. For example, dehydration is performed for 90 seconds at a rotation speed of 850 rpm (150 G). Then, the weight of the nylon bag (SAP) after dehydration is measured. This experiment is repeated a plurality of times (for example, 5 times), and the average value of the measured weights is defined as the water retention weight C.
- the water absorption amount of SAP is obtained by subtracting the weight K of the nylon net obtained in the blank test from the water absorption weight B, and the water absorption ratio of SAP is calculated by dividing the water absorption amount by the sample weight (1.00 g). Will be done.
- the water retention amount of SAP is obtained by subtracting the weight K'of the nylon net obtained in the blank test from the water retention weight C, and the water retention amount is divided by the original sample weight (1.00 g). The water retention ratio of SAP is calculated.
- the average diameter of SAP after swelling is the diameter of SAP before swelling. It is larger than (150 to 850 ⁇ m).
- the diameter of the SAP before swelling is 500 ⁇ m (0.5 mm)
- the diameter of the SAP after swelling is , 2.12 mm.
- the average diameter of the SAP after swelling is also the same value.
- the diameter of the SAP after swelling is defined by the amount of water (physiological saline in this embodiment) retained in the SAP. That is, if the amount of water retained by the SAP after dehydration is equal to the amount of water retained by the SAP after water absorption, the average diameter of the SAP will also be equal.
- the diameter of the SAP after swelling is larger than the average length (0.79 mm) of the fibers constituting the absorber 10.
- the diameter of the SAP before swelling is 250 ⁇ m or more
- the diameter of the SAP after swelling is 0.80 mm or more when the water absorption ratio (water retention ratio) is 20 times or more. That is, the average diameter of the SAP after swelling is larger than the average length (0.79 mm) of the fibers constituting the absorber 10.
- water retention ratio is 10 times, if the diameter of the SAP before swelling is 300 ⁇ m or more, the average diameter of the SAP after swelling is 0.84 mm or more, and the average length of the fibers of the absorber 10 (0. 79 mm).
- FIG. 6 is a table showing the particle size distribution of SAP used in this embodiment.
- those having a particle size before swelling in the range of 250 to 600 ⁇ m account for 79% (average value) of the whole, and the particle size is 600 ⁇ m to 850 ⁇ m.
- 12% (average value) of the total was included in the range of 850 ⁇ m, and 0% (average value) was those having a particle size of 850 ⁇ m or more.
- the average diameter of the SAP after swelling becomes larger than the average length (0.79 mm) of the fibers of the absorber 10, so that the water absorption performance of the SAP can be improved. That is, the average value of the fiber length of the absorber 10 is smaller than the average value of the diameter of SAP (super absorbent polymer) after being immersed in physiological saline for 60 minutes and then drained for 15 minutes. Therefore, the water absorption of the absorber 10 can be improved.
- FIG. 7A and 7B are diagrams illustrating the relationship between the average diameter of SAP after swelling and the average length of fibers of the absorber 10.
- the average diameter of the SAP after swelling is Rs
- the average length of the fibers constituting the absorber 10 is Lf
- FIG. 7A shows the case where Lf> Rs. That is, FIG. 7A shows a case where the absorber is formed by using fibers having a long fiber length (for example, softwood pulp or the like) as in a conventional absorbent article.
- the figure on the left side of FIG. 7A schematically shows a state in which fibers are entangled with each other to form a plurality of entangled points. In the actual absorber, the fibers are irregularly entangled with each other, but for convenience of explanation, in FIG.
- the fibers are arranged in a grid pattern at equal intervals (interval g), and the fibers are entangled with each other at the lattice points. It is assumed that an entanglement point is formed.
- FIG. 7A fibers having an average length of Lf are entangled with each other to form a net-like fiber having 16 entanglement points.
- the absorber 10 when the SAP is surrounded by net-like fibers that are tightly entwined by a large number of confounding points as shown in FIG. 7A, when the SAP absorbs water and swells, it gets caught in the fiber net. , SAP swelling may be inhibited. That is, when the SAP is surrounded by fibers longer than the SAP diameter Rs after swelling, the water cannot be absorbed to the limit capacity that the SAP can absorb, and the absorbability of the SAP may not be sufficiently exhibited. is there.
- FIG. 7B shows a case where Lf ⁇ Rs. That is, in FIG. 7B, an absorber containing water-absorbent fibers having a short fiber length such as hardwood pulp, such as the absorber 10 of the present embodiment, is shown.
- the number of entangled points between the fibers is smaller than that in the case of FIG. 7A. (4 in FIG. 7B). That is, in FIG. 7B, since the number of entangled points formed per fiber is small, the bond between the fibers is weakened.
- the absorber 10 when the SAP is surrounded by fibers that have few entanglement points and are difficult to entangle with each other as shown in FIG. 7B, the entanglement between the fibers is easily cut off when the SAP absorbs water and swells. Cheap. Further, as described above, since the fibers are thin, the area of the portion where the fibers are entangled with each other is small, and the force required to peel off the entangled point is also small. Therefore, when the SAP swells, it tends to swell without being hindered by the fibers. That is, SAP can absorb water up to the limit capacity that can be absorbed and swell. Therefore, the absorbability of SAP is increased as compared with the case of FIG. 7A, and the absorbability of the absorber 10 (absorbable core) as a whole can be improved.
- the average diameter of the SAP contained in the absorber 10 is smaller than the average length of the fibers of the absorber 10 (0.79 mm) before swelling. Therefore, before the SAP absorbs water, the entanglement between the fibers is difficult to be cut off, and problems such as the SAP slipping through the fibers and falling off from the absorber 10 are unlikely to occur.
- the average diameter of the SAP is larger than the average length of the fibers. That is, the average value of the fiber length is larger than the average value of the diameter of SAP in a state where it is immersed in physiological saline for 60 minutes, drained for 15 minutes, and then dehydrated using a centrifuge or the like. Is small. Therefore, even in the case of SAP after dehydration, it is possible to break the entanglement between fibers as described with reference to FIG. 7B, and it is possible to sufficiently exert the water absorption of SAP.
- the fibers constituting the absorber 10 include water-absorbent fibers. Therefore, in the absorber 10, it is possible to absorb water not only with SAP but also with water-absorbent fibers, so that the absorbability can be further enhanced. Further, since high absorbency is easily ensured even when the total amount of fibers is small, it is possible to form the absorber 10 thinly while improving the absorbency of the absorber 10.
- the absorbent fiber contains a broad-leaved water-absorbent fiber made of hardwood.
- the fibers are less likely to be entangled with each other. That is, since the number of entangled points formed per fiber is reduced, the entangled points are easily cut off when the SAP swells, and the swelling of the SAP is less likely to be hindered. Thereby, the absorbability of the absorber 10 can be further enhanced.
- the hardwood water-absorbent fiber hardwood pulp or the like collected from eucalyptus can be exemplified.
- the water absorption ratio of SAP contained in the absorber 10 is preferably 10 times or more and 120 times or less.
- the saturation amount of water (physiological saline) that SAP can absorb and retain is preferably 10 times or more and 120 times or less the weight of SAP before swelling.
- the average diameter of SAP before swelling is shorter than the average length of fibers (0.79 mm), and SAP after swelling. There is a high probability that the average diameter of the fibers will be longer than the average length of the fibers (0.79 mm).
- the SAP contained in the absorber 10 preferably has a diameter of 250 ⁇ m or more and 600 ⁇ m or less before swelling. As shown in FIG. 5, if the diameter of the SAP before swelling is in the range of 250 ⁇ m to 600 ⁇ m, the diameter of the SAP before swelling is shorter than the average length of the fibers (0.79 mm), and the SAP after swelling. There is a high probability that the average diameter of the fibers will be longer than the average length of the fibers (0.79 mm).
- the average density of the absorber 10 (absorbent core) in the napkin 1 is 0.04 g / cm 3 or more and 0.3 g / cm 3 or less.
- the absorber 10 is likely to be excessively deformed or twisted when the napkin 1 is worn, and the fit tends to be deteriorated.
- the average density of the absorber 10 is larger than 0.3 g / cm 3 , the absorber 10 becomes hard as a whole, causing the wearer to feel the hardness or discomfort when wearing the napkin 1. There is a risk of causing it.
- the average density of the absorber 10 is in the range of 0.04 to 0.3 g / cm 3 , it is possible to suppress the occurrence of twisting and deformation while maintaining the appropriate softness of the absorber 10. .. Further, if the density range of the absorber 10 is appropriate, the water absorption from the water-absorbent fiber to the SAP can be easily transferred naturally, and the good absorbency of the absorber 10 can be easily maintained.
- the average density of the absorber 10 is more preferably 0.17 g / cm 3 or more (0.3 g / cm 3 or less). If the average density of the absorber 10 is 0.17 g / cm 3 or more, the absorber 10 is less likely to lose its shape and is excreted even when the wearer moves the body significantly while wearing the napkin 1. Leakage can be suppressed. In particular, when the absorber 10 has a middle-high portion (not shown) that rises high on the skin side in the thickness direction in the central region in the width direction and the longitudinal direction, the middle-high portion is worn by the napkin 1.
- the shape may be more likely to collapse compared to other parts.
- the absorber 10 (middle and high parts) from twisting or losing its shape, resulting in good fit and absorption. It becomes easier to maintain sex.
- the absorber 10 of the present embodiment includes a plurality of fiber lumps (also referred to as "notts") formed by densification of fibers in a fluff shape when the pulp sheet is pulverized in the manufacturing process thereof.
- FIG. 8 is an enlarged photograph of a fiber mass obtained when a pulp sheet containing hardwood pulp is pulverized. As shown in FIG. 8, in the fiber mass, the fibers are densely packed, so that the average density is higher than the average density of the absorber 10. That is, the absorber 10 has a fiber mass which is a high-density portion and a low-density portion whose fiber density is lower than that of the fiber mass.
- the water absorbed by the absorber 10 is transferred from the low-density portion to the high-density portion (fibers) by the capillary phenomenon. It is attracted to the lump) and is easily held in the central part where the fibers are densely packed in the central part of the fiber lump (the part where the black background is not visible through the fiber lump in FIG. 8). Therefore, it becomes easy to absorb and retain the water content of the absorber 10 (absorbable core) as a whole, and the absorbability of the absorber 10 can be enhanced.
- a high-density portion is formed over the entire area in the thickness direction of the absorber 10 like the squeezed portion 40. Unlike, capillarity is likely to occur and water absorption can be increased. Further, since only a part in the thickness direction has a high density, the bulk (thickness) of the absorber 10 can be easily maintained, and the absorber 10 which is soft and has a high cushioning property can be realized.
- the ratio of the SAP in contact with the fiber mass is that of the SAP not in contact with the fiber mass. It is better to make it larger than the ratio.
- the absorbability of the absorber 10 can be improved by increasing the ratio of SAP in contact with the fiber mass to be larger than the ratio of SAP not in contact with the fiber mass.
- the ratio of SAP in contact with the fiber mass may be smaller than the ratio of SAP not in contact with the fiber mass.
- the fiber mass (notts) is formed by the concentration of fibers at a high density, and attracts water strongly by the capillary phenomenon, so that the absorption speed of water is faster than that of SAP. Therefore, when the fiber mass and the SAP are arranged so as not to be in contact with each other, the water tends to be preferentially attracted to the fiber mass first. Therefore, by making the ratio of SAP in contact with the fiber mass smaller than the ratio of SAP not in contact with the fiber mass, the absorption speed of water by the absorber 10 can be increased.
- the absorber 10 may have a fiber mass having a density lower than the average density of the absorber 10.
- the fiber mass having a density lower than the average density of the absorber 10 is, for example, a strip of non-woven fabric, an aggregate in which synthetic fibers are accumulated at a low density, or the like. Due to the inclusion of such a low-density fiber mass, a low-density portion is formed inside the absorber 10, and in the low-density portion, swelling is difficult to be suppressed when the SAP absorbs water, and the SAP It becomes easy to absorb water up to the limit capacity that can be absorbed. Therefore, the absorbability of the absorber 10 can be enhanced. Further, by including such a fiber mass, the flexibility and cushioning property of the absorber 10 are enhanced, and the fit when wearing the napkin 1 can be improved.
- the SAP contained in the absorber 10 of the present embodiment may be a spherical SAP produced by the reverse phase suspension polymerization method.
- a spherical SAP like a bunch of grapes is generated, and a fiber (0.79 mm) having a short average fiber length as in the present embodiment is a space between the tufts. Since it easily enters, it becomes easy for water to be transferred between the SAP and the fiber. This makes it easier for SAP to absorb water and enhances the absorbency of the absorber 10. Since the reverse phase suspension polymerization method is a known technique, description thereof will be omitted here.
- the SAP contained in the absorber 10 of the present embodiment may be a SAP having horns (kado) on the surface, which is produced by the pulverization method.
- SAP having corners on the surface and having few irregularities as a whole is produced.
- a fiber (0.79 mm) having a short average fiber length as in the present embodiment, since SAP is unlikely to be caught in the fiber, swelling is unlikely to be inhibited when SAP absorbs water. This makes it easier for SAP to absorb water and enhances the absorbency of the absorber 10. Since the pulverization method is a known technique, description thereof will be omitted here.
- the SAP content may be changed for each predetermined region of the absorber 10. For example, when the napkin 1 is worn, if the region of the absorber 10 that contacts the vaginal opening of the wearer is defined as the vaginal opening contact region, the content of SAP in the vaginal opening contact region of the absorber 10 is increased. It is preferable that the content is higher than the SAP content in the region other than the vaginal opening contact region. In this way, when menstrual blood or the like is excreted, the SAP content in the vicinity of the vaginal opening contact area is high, so that the menstrual blood is rapidly absorbed and diffuses to the area other than the vaginal opening contact area. It becomes difficult. That is, in the absorber 10, menstrual blood is less likely to spread and leakage is less likely to occur. As a result, it is possible to make the wearer less likely to feel uncomfortable.
- the vaginal opening contact region in the napkin 1 of the present embodiment is a region between the anterior end and the posterior end of the wing portion 30 in the longitudinal direction.
- the region between the wing anterior end 30 ef and the wing posterior end 30 eb in the longitudinal direction is the vaginal opening contact region.
- SAP is not provided in the portion overlapping the line connecting the front ends 30ef and 30ef of the wings on both sides in the width direction (indicated by a broken line in FIG. 1).
- the line connecting the front ends 30ef and 30ef of the wing is a portion serving as a bending starting point that bends and deforms the absorber 10 in the longitudinal direction when the wearer of the napkin 1 moves his / her body.
- SAP is not provided at a portion overlapping the line connecting the rear ends 30eb and 30eb of the wings on both sides in the width direction.
- the SAP content (weight) in the skin-side portion when the absorber 10 is bisected in the thickness direction is larger than the SAP content (weight) in the non-skin-side portion.
- the water absorption of the absorber 10 on the skin side in the thickness direction can be made higher than that on the non-skin side. Therefore, when the napkin 1 is worn, the moisture between the wearer's skin and the absorber 10 is easily absorbed by the SAP, and the skin side surface of the napkin 1 can be made less stuffy. This makes it less likely to cause discomfort to the wearer.
- the SAP content (weight) in the skin-side portion when the absorber 10 is bisected in the thickness direction may be equal to or less than the SAP content (weight) in the non-skin-side portion.
- the napkin 1 is provided with a plurality of pressing portions 40 for integrally pressing the top sheet 3 (and the second sheet 4) and the absorber 10 (absorbent core).
- These squeezed portions 40 are formed by, for example, embossing the napkin 1 (top sheet 3) from the skin side to the non-skin side in the thickness direction. Since the absorber 10 is provided with such a squeezed portion 40, a region having a high fiber density is formed around the SAP, and water can be transferred between the region (squeezed portion 40) and the SAP. It will be easier to do.
- such a squeezed portion 40 is formed in a region where the content of SAP is lower than that of other regions in the plane direction of the absorber 10.
- the swelling of the SAP is inhibited by the high-density fibers when the SAP absorbs water. Can be suppressed. Therefore, the absorbability of the absorber 10 can be enhanced.
- the squeezed portion 40 may be formed in a region having a higher SAP content than other regions in the plane direction of the absorber 10.
- the SAP since the SAP is arranged near the region where the fiber density of the absorber is high (that is, the squeezed portion 40), water can be easily transferred between the squeezed portion 40 and the SAP. For example, even a small amount of water can be easily absorbed by SAP via the squeezing section 40. Thereby, the absorbability of the absorber 10 can be enhanced.
- thermoplastic fibers are fused to each other.
- the thermoplastic fibers are fused to each other, so that the top sheet 3 and the absorber 10 become more integrally and the shape of the absorber 10 becomes more stable.
- thermoplastic fibers are heat-sealed to each other in a portion of the absorber 10 other than the squeezed portion 40, the absorber 10 becomes hard or becomes a film at the location where the heat fusion occurs. Problems such as reduced liquid diffusivity may occur.
- the squeezed portion 40 of the absorber 10 is a portion that conforms to the deformation of the absorber 10 by being squeezed and hardened, the thermoplastic fibers may be heat-sealed and hardened at the portion. The effect of reduced liquid diffusivity is small. Therefore, even if the thermoplastic fibers are fused to each other in the squeezed portion 40 of the napkin 1, a problem is unlikely to occur.
- the sanitary napkin 1 as an example of the absorbent article has a pair of wing portions 30, but is not limited to this. That is, the wing portion 30 may be omitted.
- the absorber 10 is covered with two sheets, a second sheet 4 and a cover sheet 6, but the present invention is not limited to this.
- the skin side surface and the non-skin side surface of the absorber 10 may be covered with a single sheet.
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Abstract
Description
互いに直交する長手方向と幅方向と厚さ方向とを有し、繊維と高吸収性ポリマーとを有する吸収性コアを備える吸収性物品であって、前記繊維の長さの平均値は、生理食塩水に浸漬していない状態の前記高吸収性ポリマーの直径の平均値よりも大きく、前記生理食塩水に60分間浸漬させた後、15分間水切りを行った状態の前記高吸収性ポリマーの直径の平均値よりも小さい、ことを特徴とする吸収性物品。
<<生理用ナプキンの基本的構成>>
本実施形態に係る吸収性物品の一例として生理用ナプキン1(以下、単に「ナプキン1」とも呼ぶ)について説明する。なお、以下の説明では吸収性物品の例として生理用ナプキンについて説明するが、本実施形態の吸収性物品には、所謂おりものシート(例えばパンティライナー)や軽失禁パッド等も含まれており、生理用ナプキンに限定されるものではない。
吸収体10は、液体を吸収する吸水性繊維を有し、平面視縦長形状に成形されている。また、吸収体10に、吸水性繊維以外の素材(例えば、熱可塑性樹脂繊維等の疎水性繊維)が含まれても良い。吸水性繊維と熱可塑性樹脂繊維(疎水性繊維)とを有する場合、吸収体10は、これらの繊維同士が互いに混合した状態で形成される。
図3Bに示すように、針葉樹パルプの平均繊維幅は30μmm程度であり(上図)、繊維幅の分布幅が広い(標準偏差は11.9)。これに対し、広葉樹パルプの平均繊維幅は15μm程度であり(下図)、繊維幅の分布幅が狭い(標準偏差は7.55)。本実施形態のナプキン1では、吸収体10に広葉樹パルプを用いていることにより、針葉樹パルプのみを用いている場合と比較して、保水性繊維の平均繊維幅が短くなっている。
本実施形態のナプキン1では、吸収体10に含まれる繊維の平均繊維長(0.79mm)と、水分を吸収して膨潤する前後におけるSAPの径との関係を規定することにより、吸収体10に内部において、SAPの膨潤が妨げられ難くなるようにしている。
以上、本発明の実施形態について説明したが、上記の実施形態は、本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。また、本発明は、その趣旨を逸脱することなく、変更や改良され得るとともに、本発明にはその等価物が含まれるのは言うまでもない。
2 サイドシート、3 トップシート、4 セカンドシート、
5 バックシート、6 カバーシート、
10 吸収体(吸収性コア)、
20 ナプキン本体部、
30 ウイング部、30ef 前側端、30eb 後ろ側端、
40 圧搾部、
70 回転ドラム、71 凹部、72 吸引部、
80 材料供給部、80a フード、
81 粒子供給部、
Claims (21)
- 互いに直交する長手方向と幅方向と厚さ方向とを有し、
繊維と高吸収性ポリマーとを有する吸収性コアを備える吸収性物品であって、
前記繊維の長さの平均値は、
生理食塩水に浸漬していない状態の前記高吸収性ポリマーの直径の平均値よりも大きく、
前記生理食塩水に60分間浸漬させた後、15分間水切りを行った状態の前記高吸収性ポリマーの直径の平均値よりも小さい、
ことを特徴とする吸収性物品。 - 請求項1に記載の吸収性物品であって、
前記繊維の長さの平均値は、
前記生理食塩水に60分間浸漬させ、15分間水切りを行った後、遠心分離器で脱水された状態の前記高吸収性ポリマーの直径の平均値よりも小さい、ことを特徴とする吸収性物品。 - 請求項1または2に記載の吸収性物品であって、
前記繊維には、吸水性繊維が含まれている、ことを特徴とする吸収性物品。 - 請求項3に記載の吸収性物品であって、
前記繊維には、広葉樹からなる広葉樹吸水性繊維が含まれている、ことを特徴とする吸収性物品。 - 請求項1~4のいずれか1項に記載の吸収性物品であって、
前記高吸収性ポリマーが保持可能な前記生理食塩水の飽和量は、前記生理食塩水に浸漬していない状態の前記高吸収性ポリマーの重量の10倍以上、120倍以下である、ことを特徴とする吸収性物品。 - 請求項1~5のいずれか1項に記載の吸収性物品であって、
前記生理食塩水に浸漬していない状態の前記高吸収性ポリマーの直径の平均値は、250μm以上、600μm以下である、ことを特徴とする吸収性物品。 - 請求項1~6のいずれか1項に記載の吸収性物品であって、
前記吸収性コアの平均密度が、0.04g/cm3以上、0.3g/cm3以下である、ことを特徴とする吸収性物品。 - 請求項7に記載の吸収性物品であって、
前記吸収性コアの平均密度が、0.17g/cm3以上である、ことを特徴とする吸収性物品。 - 請求項1~8のいずれか1項に記載の吸収性物品であって、
前記吸収性コアは、前記吸収性コアの平均密度よりも密度が高く、前記繊維が密集した繊維塊を含んでおり、
前記吸収性コアは、少なくとも一つの前記繊維塊の前記厚さ方向の一方側又は他方側に、前記繊維塊よりも繊維密度が低い低密度部を有する、ことを特徴とする吸収性物品。 - 請求項9に記載の吸収性物品であって、
前記繊維塊と接している前記高吸収性ポリマーの割合が、前記繊維塊と接していない前記高吸収性ポリマーの割合よりも大きい、ことを特徴とする吸収性物品。 - 請求項9に記載の吸収性物品であって、
前記繊維塊と接している前記高吸収性ポリマーの割合が、前記繊維塊と接していない前記高吸収性ポリマーの割合よりも小さい、ことを特徴とする吸収性物品。 - 請求項1~8のいずれか1項に記載の吸収性物品であって、
前記吸収性コアは、前記吸収性コアの平均密度よりも密度が低い繊維塊を含んでいる、ことを特徴とする吸収性物品。 - 請求項1~12のいずれか1項に記載の吸収性物品であって、
前記高吸収性ポリマーは、球状の外形を有している、ことを特徴とする吸収性物品。 - 請求項1~12のいずれか1項に記載の吸収性物品であって、
前記高吸収性ポリマーは、表面に角を有している、ことを特徴とする吸収性物品。 - 請求項1~14のいずれか1項に記載の吸収性物品であって、
前記吸収性コアは、前記吸収性物品の着用時に、着用者の膣口と当接する領域である膣口当接領域を有し、
前記膣口当接領域における前記高吸収性ポリマーの含有率は、前記膣口当接領域以外の領域における前記高吸収性ポリマーの含有率よりも大きい、ことを特徴とする吸収性物品。 - 請求項1~15のいずれか1項に記載の吸収性物品であって、
前記厚さ方向において前記吸収性コアを2等分したときの肌側部分における前記高吸収性ポリマーの含有率は、
前記厚さ方向において前記吸収性コアを2等分したときの非肌側部分における前記高吸収性ポリマーの含有率よりも大きい、ことを特徴とする吸収性物品。 - 請求項1~15のいずれか1項に記載の吸収性物品であって、
前記厚さ方向において前記吸収性コアを2等分したときの肌側部分における前記高吸収性ポリマーの含有率は、
前記厚さ方向において前記吸収性コアを2等分したときの非肌側部分における前記高吸収性ポリマーの含有率以下である、ことを特徴とする吸収性物品。 - 請求項1~17に記載の吸収性物品であって、
前記繊維には、広葉樹からなる広葉樹吸水性繊維が含まれており、
前記広葉樹吸水性繊維の平均繊維幅は15μm以下であり、
前記吸収性コアの単位面積当たりに含まれる前記広葉樹吸水性繊維の本数は、300本/mm2以上、2500本/mm2未満であり、
複数の前記広葉樹吸水性繊維の間に高吸収性ポリマーを有している、ことを特徴とする吸収性物品。 - 請求項1~18に記載の吸収性物品であって、
前記繊維には、広葉樹からなる広葉樹吸水性繊維が含まれており、
前記広葉樹吸水性繊維の繊維長の標準偏差は0.27以下であり、
前記広葉樹吸水性繊維の繊維幅の標準偏差は7.55以下である、ことを特徴とする吸収性物品。 - 請求項19に記載の吸収性物品であって、
前記広葉樹吸水性繊維の平均繊維長に前記広葉樹吸水性繊維の繊維長の標準偏差を加えた値は、前記広葉樹吸水性繊維の前記平均繊維長の2倍の値よりも小さく、
前記広葉樹吸水性繊維の前記平均繊維長から前記広葉樹吸水性繊維の繊維長の前記標準偏差を引いた値は、前記広葉樹吸水性繊維の前記平均繊維長の1/2の値よりも大きい、ことを特徴とする吸収性物品。 - 請求項1~20に記載の吸収性物品であって、
前記繊維には、広葉樹からなる広葉樹吸水性繊維が含まれており、
前記吸収性コアは、複数の熱可塑性繊維を含み、且つ前記吸収性コアを前記厚さ方向に一体的に圧搾する圧搾部を有しており、
前記圧搾部において、前記熱可塑性繊維が互いに融着している、ことを特徴とする吸収性物品。
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JPH09310259A (ja) * | 1996-05-23 | 1997-12-02 | Chisso Corp | 極細繊維不織布 |
JP2001309940A (ja) * | 2000-04-28 | 2001-11-06 | Daio Paper Corp | 薄型吸収体および薄型吸収性物品並びにその製造方法 |
JP2003010680A (ja) * | 2001-03-26 | 2003-01-14 | Mitsubishi Chemicals Corp | 吸水性複合体及びその製造方法 |
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US20110276019A1 (en) * | 2009-01-19 | 2011-11-10 | Sumitomo Seika Chemicals Co.. Ltd. | Water-absorbent sheet composition |
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JPH09310259A (ja) * | 1996-05-23 | 1997-12-02 | Chisso Corp | 極細繊維不織布 |
JP2001309940A (ja) * | 2000-04-28 | 2001-11-06 | Daio Paper Corp | 薄型吸収体および薄型吸収性物品並びにその製造方法 |
JP2003010680A (ja) * | 2001-03-26 | 2003-01-14 | Mitsubishi Chemicals Corp | 吸水性複合体及びその製造方法 |
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