WO2024062655A1 - Article absorbant - Google Patents

Article absorbant Download PDF

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Publication number
WO2024062655A1
WO2024062655A1 PCT/JP2023/009901 JP2023009901W WO2024062655A1 WO 2024062655 A1 WO2024062655 A1 WO 2024062655A1 JP 2023009901 W JP2023009901 W JP 2023009901W WO 2024062655 A1 WO2024062655 A1 WO 2024062655A1
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WO
WIPO (PCT)
Prior art keywords
absorbent body
backsheet
absorbent
skin
sheet
Prior art date
Application number
PCT/JP2023/009901
Other languages
English (en)
Japanese (ja)
Inventor
美帆子 倉持
健 山口
貴之 白鳥
Original Assignee
大王製紙株式会社
国立大学法人東北大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 大王製紙株式会社, 国立大学法人東北大学 filed Critical 大王製紙株式会社
Publication of WO2024062655A1 publication Critical patent/WO2024062655A1/fr

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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
    • A61F13/51—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 outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • 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
    • A61F13/56—Supporting or fastening means

Definitions

  • the present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads for absorbing body fluids such as menstrual blood, vaginal discharge, and urine.
  • This invention relates to an absorbent article that reduces friction with other objects.
  • Patent Document 1 discloses that an absorbent body in the rear side region has a central region at the center in the width direction and side regions on both sides thereof, and the central region has an absorbent material.
  • An absorbent article is disclosed that is provided with front and rear slits that extend in the front-rear direction of the article and are configured to allow the absorbent core in the rear region to bulge toward the wearer.
  • Patent Document 2 discloses that a friction reducing layer is provided between a back sheet and an absorbent portion, and the friction between the friction reducing layer and the back sheet or the friction between the friction reducing layer and the absorbing portion is absorbed. It is disclosed that chafing between the absorbent article and the skin that may occur during wearing can be prevented by reducing the friction between the body and the backsheet.
  • a shear deformation layer is provided between an absorbent body and an anti-slip adhesive layer, and a member disposed on the skin side of the shear deformation layer due to shear deformation of the shear deformation layer;
  • the member disposed on the non-skin side of the shear deformation layer is configured to be able to be displaced relative to the surface direction.
  • the widthwise center of the absorber in the rear region is raised toward the wearer with the front and back slits as vertices, so that the widthwise center of the absorber in the rear region is located between the buttocks.
  • the absorbent body can be placed more closely along the wearer's buttocks, preventing body fluids such as menstrual blood from flowing through the body and flowing to the back of the body and leaking from the back of the absorbent article. It looks like this.
  • the absorbent material is joined to the backsheet, when the wearer moves, the absorbent material moves together with the backsheet fixed to the underwear, so the absorbent material follows the movements of the body, such as the buttocks. This may cause chafing between the surface layer of the absorbent article and the skin, which may cause skin problems, and body fluids are likely to leak down the skin through the gap between the surface of the absorbent article and the skin. There was a problem.
  • the shear deformation layer shear deforms to maintain the surface of the absorbent article in close contact with the skin surface, but the wearer's body movement causes the underwear to change.
  • the shear deformation of the shear deformation layer alone cannot deal with the problem, and rubbing occurs between the surface of the absorbent article and the skin surface, which may cause skin trouble.
  • the main object of the present invention is to provide an absorbent article that reliably prevents chafing between the absorbent article surface and the skin surface, reduces skin trouble, improves the fit to the buttocks, and prevents leakage. It's about doing.
  • an absorbent body is laminated on the skin side of a backsheet, and the backsheet and the absorbent body are not joined, A friction reduction layer is provided between the backsheet and the absorbent body, An absorbent article is provided, wherein the rear end portion of the absorbent body is divided into a plurality of parts in the width direction by dividing portions extending in the longitudinal direction of the absorbent article.
  • the backsheet and the absorbent body are not joined, and a friction reducing layer is provided between the backsheet and the absorbent body, so that there is no slippage between the absorbent body and the backsheet.
  • a friction reducing layer is provided between the backsheet and the absorbent body, so that there is no slippage between the absorbent body and the backsheet.
  • the rear end portion of the absorbent body is divided into a plurality of pieces in the width direction by a dividing portion extending in the longitudinal direction of the absorbent article.
  • each part divided in the width direction by the dividing part can move in response to the difference in movement of the left and right buttocks, and as described above, the absorbent body is not joined to the backsheet, Since a friction-reducing layer is provided between the backsheet and the absorbent body, each part of the absorbent body divided by the dividing portion slides between the backsheet and the left and right buttocks. This will allow for flexible follow-up. Therefore, the fit with the buttocks can be improved, and leakage of body fluids can be reliably prevented.
  • the skin side of the absorbent body is covered with a skin-contacting surface layer, and a flap portion configured of the back sheet and the skin-contacting surface layer that extends outward from the outer edge of the absorbent body.
  • a full-circumference seal portion is formed in which the back sheet and the skin contact surface layer are joined over the entire circumference;
  • a non-bonded region of the backsheet is formed between the absorber and the entire circumference seal portion, and the friction reducing layer is provided extending to this non-bonded region.
  • the absorbent article according to claim 1 wherein the dividing portion is formed by either a notch having a predetermined dividing width or a linear notch, or a combination thereof.
  • the form of the dividing portion includes either a notch portion or a notch portion, or a combination thereof. Since the absorbent body is divided by a predetermined dividing width in the notch, each part of the absorbent body divided at the dividing part can move easily without interfering with each other. In addition, since there is almost no gap between the parts of the absorbent body divided by the dividing part in the cut part, the absorbency of body fluids is excellent.
  • the absorbent article according to claim 1 wherein the dividing portion is formed by a notch whose dividing width gradually increases toward the rear end.
  • a particularly preferable form of the dividing portion is a notch whose dividing width gradually increases toward the rear end.
  • an anti-slip adhesive layer for fixing the absorbent article to underwear is provided on the outer surface of the backsheet, The absorbent article according to claim 1, wherein the anti-slip adhesive layer extends to a region overlapping each portion of the absorbent body divided by the dividing portion.
  • the anti-slip adhesive layer is provided to extend to the area overlapping with each part of the absorbent body divided at the dividing part, so that the back sheet fixed to the underwear moves with the underwear. At this time, each part of the absorbent body divided at the dividing part becomes relatively easy to slide on the backsheet, and it becomes possible to fit the buttocks more reliably.
  • the present invention can reliably prevent friction between the surface of the absorbent article and the skin, reducing skin troubles, while improving the fit to the buttocks and preventing leakage.
  • FIG. 1 is a partially cutaway developed view showing a sanitary napkin 1 according to the present invention.
  • 2 is a back view of FIG. 1.
  • FIG. 2 is a view taken along the line III-III in FIG. 1.
  • FIG. FIG. 4 is a plan view of the rear end of the absorbent body 4, showing an example of the dividing portion 11.
  • FIG. 3 is a plan view of the rear end of the absorbent body 4, showing an example of the dividing portion 11.
  • FIG. FIG. 4 is a plan view of the rear end of the absorbent body 4, showing an example of the dividing portion 11.
  • FIG. FIG. 4 is a plan view of a rear end portion of a modified example of the absorbent body 4.
  • FIG. FIG. 4 is a side view of the rear end of a modified example of the absorbent body 4.
  • FIG. 7 is a plan view of the rear end showing another modified example of the absorber 4.
  • FIG. 3 is a cross-sectional view of a sanitary napkin 1 according to a modified example.
  • FIG. 11 is a cross-sectional view of a sanitary napkin 1 according to a modified example.
  • FIG. 3 is a cross-sectional view of a sanitary napkin 1 according to a modified example.
  • FIG. 3 is a cross-sectional view of a sanitary napkin 1 according to a modified example.
  • the sanitary napkin 1 includes a liquid-impermeable backsheet 2 made of a polyethylene sheet, a polypropylene sheet, etc., and a backsheet 2 that allows menstrual blood and vaginal discharge to pass through quickly.
  • the second sheet 6 is made of a porous plastic film or nonwoven fabric, and the side sheets 7 are arranged along the front-rear direction on both sides of the skin-contacting surface.
  • the top sheet 3 and the side sheet 7 cover the skin side of the absorbent body 4 and constitute a skin-contact surface layer that comes into contact with the wearer's skin when the sanitary napkin 1 is worn.
  • the backsheet 2 and topsheet 3 extend outward from the outer edge of the absorbent core 4, and the backsheet 2 and topsheet 3 extend outward from the outer edge of the absorbent core 4 at the front and rear edges, and the backsheet 2 and sidesheet 7 extend outward from the outer edge of the absorbent core 4 at both side edges.
  • a flap portion F is formed in which no absorber 4 is interposed.
  • the back sheet 2 is made of a sheet material that is at least water-proof, such as an olefin resin sheet such as polyethylene or polypropylene, but other materials such as a laminated nonwoven fabric made by laminating a nonwoven fabric to a polyethylene sheet or the like, or a nonwoven fabric sheet with a waterproof film interposed therebetween to ensure substantial liquid impermeability (in this case, the waterproof film and the nonwoven fabric constitute the back sheet), can also be used.
  • a sheet material that is at least water-proof such as an olefin resin sheet such as polyethylene or polypropylene
  • other materials such as a laminated nonwoven fabric made by laminating a nonwoven fabric to a polyethylene sheet or the like, or a nonwoven fabric sheet with a waterproof film interposed therebetween to ensure substantial liquid impermeability (in this case, the waterproof film and the nonwoven fabric constitute the back sheet), can also be used.
  • a nonwoven fabric sheet with a waterproof film interposed therebetween to ensure substantial liquid impermeability (in
  • This water-proof and moisture-permeable sheet material is a microporous sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching it in a uniaxial or biaxial direction.
  • an olefin resin such as polyethylene or polypropylene
  • the back sheet 2 will be explained further below.
  • a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is preferably used.
  • the material fibers constituting the non-woven fabric include, for example, olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based fibers, polyamide-based fibers, etc., as well as recycled fibers such as rayon and cupro, and natural fibers such as cotton.
  • a nonwoven fabric obtained by an appropriate processing method such as a method, an air-laid method, a spunlace method, a spunbond method, a melt-blown method, or a needle punch method can be used.
  • the spunlace method is superior in that it has high flexibility and drapability
  • the thermal bond method is superior in that it is bulky and has high compression recovery properties.
  • the fibers of the nonwoven fabric may be either long fibers or short fibers, but it is preferable to use short fibers to give the texture of toweling.
  • olefin fibers such as polyethylene or polypropylene having a relatively low melting point.
  • composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers, which have a core of fibers with a high melting point and a sheath of fibers with a low melting point, can also be suitably used.
  • the absorbent body 4 interposed between the back sheet 2 and the top sheet 3 is made of, for example, fluff-like pulp and a super absorbent resin.
  • the planar shape is a vertically elongated substantially oval shape that is long in the longitudinal direction of the napkin.
  • the pulp may be made of cellulose fibers such as chemical pulp and dissolving pulp obtained from wood, or artificial cellulose fibers such as rayon and acetate, and coniferous pulp having longer fibers is more suitable than hardwood pulp in terms of functionality and cost.
  • the weight of the pulp is 100 g/m 2 to 600 g/m 2 , preferably 100 g/m 2 to 300 g/m 2 .
  • the superabsorbent resin is mixed into the pulp constituting the absorbent body, for example, as granular powder.
  • the super absorbent resin include crosslinked polyacrylates, self-crosslinked polyacrylates, saponified crosslinked acrylic ester-vinyl acetate copolymers, crosslinked isobutylene/maleic anhydride copolymers, Examples include crosslinked polysulfonate salts and partially crosslinked water-swellable polymers such as polyethylene oxide and polyacrylamide.
  • acrylic acid or acrylate-based materials are preferred because of their excellent water absorption amount and water absorption rate.
  • the absorption capacity (water absorption power) and absorption rate of the superabsorbent resin having water absorption performance can be adjusted by adjusting the crosslink density and the crosslink density gradient in the manufacturing process.
  • synthetic fibers may be mixed in the absorbent body 4.
  • the synthetic fibers can be, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate or polybutylene terephthalate, polyamides such as nylon, and copolymers thereof. A mixture may also be used.
  • Composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers, which have a core of fibers with a high melting point and a sheath of fibers with a low melting point, can also be used.
  • hydrophobic fibers it is desirable that the synthetic fibers be surface-treated with a hydrophilic agent so that they have an affinity for body fluids.
  • the width dimension of the absorbent body 4 may be approximately the same width over the entire length, and may correspond to the groin area including the body fluid discharge area H so as not to give the wearer a stiff feeling due to contact with the groin area.
  • An arcuate cutout portion may be provided in a predetermined section in the longitudinal direction.
  • This absorber 4 will be further explained later.
  • the covering sheet 5 When providing the covering sheet 5 that surrounds the absorbent core 4 as in this example, the covering sheet 5 is interposed between the top sheet 3 and the absorbent core 4, which improves absorbency.
  • the excellent encapsulant sheet 5 allows bodily fluids to diffuse quickly and prevents menstrual blood and the like from flowing back.
  • crepe paper, hydrophilic nonwoven fabric, or the like can be used as the enveloping sheet 5.
  • the hydrophilic second sheet 6 disposed adjacent to the non-skin side of the top sheet 3 may be any material as long as it is hydrophilic to body fluids.
  • materials that have hydrophilic properties such as recycled fibers such as rayon and cupro, natural fibers such as cotton, or synthetic materials such as olefins such as polyethylene or polypropylene, polyesters, and polyamides are used. Fibers that have been surface-treated with a hydrophilic agent to impart hydrophilic properties can be used. Further, composite fibers such as core-sheath type fibers, side-by-side type fibers, split type fibers, etc., which have a core of fibers with a high melting point and a sheath of fibers with a low melting point, can be used. It is desirable that the second sheet 6 and the absorbent body 4 (covering sheet) be bonded together using a hot melt adhesive or the like. By joining the second sheet 6 and the absorbent body 4, body fluids can be quickly transferred from the second sheet 6 to the absorbent body 4.
  • the width of the top sheet 3 is slightly longer than the width of the absorbent core 4, as shown in the cross-sectional view of FIG.
  • the side sheet 7 is separate from the top sheet 3, and is treated with water repellent treatment or water repellent treatment depending on the purpose of preventing menstrual blood, vaginal discharge, etc. from penetrating, or increasing the texture.
  • a side sheet 7 made of a nonwoven fabric material subjected to hydrophilic treatment is provided.
  • the side sheet 7 may be made of natural fibers, synthetic fibers, recycled fibers, or the like and formed by an appropriate processing method, but it is preferable to eliminate stiffness and prevent stuffiness. Therefore, it is best to use a nonwoven fabric with a low basis weight and breathability.
  • the side sheet 7 is disposed outside the widthwise intermediate portion over a range from a predetermined inner position to the outer edge of the back sheet 2, and the laminated portion with the top sheet 3 is bonded to the side sheet 7 with an adhesive such as hot melt.
  • an adhesive such as hot melt.
  • These side flap portions are a pair of left and right wing-shaped flap portions that extend from the side edge of the absorbent body 4 more than the front and rear portions, and are located at a side position corresponding to the wearer's body fluid discharge area H.
  • Form W, W As shown in FIG. 2, a wing adhesive layer 9 is provided on the outer surface side (outer surface side of the back sheet 2) of the wing-shaped flap portions W, W. , W are folded back to the opposite side (back sheet 2 side) at the base end folding line RL (see Fig. 1) and wrapped around the crotch part of the underwear, and the wing adhesive layer 9 is wrapped around the crotch part of the underwear.
  • a pair of left and right hip-holding flaps are formed on the buttock side (rear side) of the absorbent core 4 so that the amount of extension from the side edge of the absorbent body 4 is larger than that of the front and rear portions.
  • a hip-holding adhesive layer is provided on the outer surface side of the hip-holding flap portion (the outer surface side of the backsheet 2), and when worn on the underwear, the hip-holding adhesive layer is fixed to the inner surface of the underwear, It covers the wearer's buttocks when worn.
  • the inner side portion of the side sheet 7 is bonded to the absorbent body 4 side (top sheet 3) in a substantially double-folded state.
  • the inner side portion of the side sheet 7 has one or more sheets fixed at both ends or at appropriate positions in the longitudinal direction in the longitudinal intermediate portion including at least the body fluid discharge region H inside the double sheet.
  • the backsheet 2 and the absorbent body 4 laminated on the skin side of the backsheet 2 are not joined.
  • the absorbent body 4 is merely laminated on the skin side of the backsheet 2, and no bonding using adhesive, heat sealing, ultrasonic sealing, etc. is performed over the entire non-skin side surface.
  • the skin side of the absorbent body 4 is joined to the top sheet 3 (second sheet 6), and this top sheet 3 is joined to the back sheet 2 at the flap portion F either directly or via the side sheet 7, so that the absorbent body 4 does not move freely relative to the backsheet 2, but when an external force is applied to the backsheet 2, the absorbent body 4 and the backsheet 2 can slide relative to each other.
  • a friction reducing layer 10 is provided between the backsheet 2 and the absorbent body 4.
  • the friction reducing layer 10 is a layer that reduces friction between the backsheet 2 and the absorbent body 4. By providing the friction-reducing layer 10, the frictional force between the backsheet 2 and the absorbent body 4 is reduced, making it easier for relative sliding to occur.
  • the back sheet 2 and the absorbent body 4 are not joined, and the friction-reducing layer 10 is provided between the back sheet 2 and the absorbent body 4, so that the absorbent body 4 is relatively easy to slide against the back sheet 2.
  • the back sheet 2 fixed to the underwear by the slip-prevention adhesive layer 8 also moves in the same way as the underwear.
  • the back sheet 2 is not joined to the absorbent body 4 as described above, the movement of the underwear is absorbed by the slip between the absorbent body 4 and the back sheet 2, and the movement of the back sheet 2 is not easily transmitted to the absorbent body 4, so that the member on the skin side of the absorbent body 4 (including the skin-contacting surface layer of the top sheet 3 and the side sheet 7) can be maintained in close contact with the skin surface.
  • the member on the skin side of the absorbent body 4 including the skin-contacting surface layer of the top sheet 3 and the side sheet 7
  • the rear end portion of the absorbent body 4 is divided into a plurality of parts in the width direction by a dividing portion 11 extending in the longitudinal direction of the sanitary napkin 1. That is, by forming the dividing portion 11 from a predetermined rear position to the rear end of the absorbent body 4, the rear end portion of the absorbent body 4 is divided into a plurality of parts in the width direction, and the divided absorbent body portions are divided into a plurality of parts in the width direction. Each of them can be transformed.
  • the dividing portion 11 allows the wearer to move the legs in the width direction. Since each part of the divided rear end of the absorbent body moves differently in response to the difference in left and right movement of the buttocks, the surface of the sanitary napkin 1 can be maintained in close contact with the skin, and body fluids can be reliably removed. Leakage can be prevented. Moreover, since the friction between the backsheet 2 and the absorbent body 4 is reduced by the friction reducing layer 10 provided between them, the influence of the movement of the backsheet 2 due to the movement of the underwear is minimized.
  • each divided part of the absorbent body 4 can flexibly follow the movement of the buttocks. If the friction reducing layer 10 is not provided, the friction force between the absorbent body 4 and the backsheet 2 will cause the backsheet 2 to follow the movement of the underwear when the backsheet 2 moves with the movement of the underwear. There is a risk that the absorbent body 4 may also move, causing friction between the surface of the sanitary napkin 1 and the skin surface, and the movement of the absorbent body portion divided by the dividing portion 11 is poor, and this absorbent body portion may move around the buttocks. become unable to move in accordance with the movements of
  • the flap part F is composed of the backsheet 2, top sheet 3, and side sheet 7 that extend outward from the outer edge of the absorbent core 4. has been done.
  • a full-circumference seal portion 12 is formed in this flap portion F, in which the back sheet 2 and the top sheet 3 and side sheet 7 that constitute the skin-contact surface layer are joined over the entire circumference of the sanitary napkin 1. .
  • the entire circumference seal portion 12 is a portion that integrally joins the backsheet 2 and the skin contact surface layer in the flap portion F, and specifically, the entire circumference seal portion 12 is a portion that integrally joins the backsheet 2 and the skin contact surface layer.
  • the back sheet 2 and top sheet 3 extending outward from the outer edge of the absorbent core 4 are coated with hot melt adhesive, and the back sheet 2 and the side sheet 7 extending outward from the outer edge of the absorbent core 4 are coated with hot melt adhesive at both side edges of the absorbent core 4.
  • This is a portion that is bonded along the entire circumference of the absorber 4 substantially along the outer edge thereof by bonding means such as adhesive bonding, heat sealing, and ultrasonic sealing.
  • the circumferential seal portion 12 may be a continuous seal line made up of continuous seal portions along the circumferential direction, or may be an intermittent seal line in which a plurality of seal portions and non-seal portions are alternately arranged. .
  • seal width of this entire circumference seal portion 12 is preferably about 1 to 10 mm, and it may be a constant seal width over the entire circumference, or for example, the seal width may be set at the front and rear ends of the sanitary napkin 1. It may be changed depending on the part, such as making it thicker.
  • the circumferential seal portion 12 is placed at a position spaced a certain distance S outward from the outer edge of the absorbent body 4.
  • a non-bonded region 13 of the sheet 2 is formed.
  • the non-bonded region 13 is an annular region that extends along the outer edge of the absorbent core 4 all around the absorbent core 4 and is formed immediately outside the absorbent core 4 .
  • the distance S between the absorbent body 4 and the entire circumference seal portion 12 is preferably 3 mm or more, and more preferably 3 to 10 mm.
  • a range of motion of 3 mm or more is required to accommodate the movement of the underwear when the wearer moves his or her legs while walking.
  • the friction-reducing layer 10 is provided not only in the laminated area with the absorbent body 4, but also extending to the non-bonded area 13 of the back sheet 2.
  • the friction-reducing layer 10 is provided between the back sheet 2 and the absorbent body 4, and is also provided in the non-bonded area 13 that extends outward from the outer edge of the absorbent body 4.
  • the friction-reducing layer 10 is not provided in the circumferential seal portion 12 outside the non-bonded area 13, or in the flap portion F further outward.
  • the non-bonded area 13 of the backsheet 2 By forming the non-bonded area 13 of the backsheet 2 between the absorbent body 4 and the entire circumference seal portion 12, the range of motion when relative sliding occurs between the backsheet 2 and the absorbent body 4 is reduced. can be extended to the non-bonded region 13. Further, by providing the friction reducing layer 10 extending to the non-bonded area 13, the slippage between the backsheet 2 and the absorbent body 4 is improved even in this non-bonded area 13.
  • the dividing portion 11 may be formed in any shape as long as it divides the rear end of the absorbent body 4 into multiple portions in the width direction and extends in the longitudinal direction of the sanitary napkin 1, but as shown in Fig. 1 and Figs. 4A to 4C, it is preferable to form the dividing portion 11 as either a notch 11a having a predetermined dividing width or a linear cut 11b, or a combination of these.
  • a notch 11a having a predetermined dividing width or a linear cut 11b, or a combination of these.
  • Fig. 1 it is formed as a notch 11a whose dividing width gradually increases toward the rear end
  • Fig. 4A it is formed as a notch 11a whose dividing width is approximately equal over the entire length
  • Fig. 4B it is formed as a linear cut 11b
  • Fig. 4C it is formed as a linear cut 11b on the front side and a notch 11a whose dividing width gradually increases toward the rear end on the rear
  • the notch 11a has a width that can be visually recognized between the edges of both sides of the notch (divided width), and the width of the notch 11b is unclear, but it is difficult to distinguish between them. does not need to be particularly clear, and the rear end portion of the absorbent body 4 is divided in the width direction by the dividing portion 11, and the left and right absorbent body portions separated by the dividing portion 11 can move differently. It is sufficient as long as it is configured.
  • the dividing part 11 is formed by the cutout part 11a, the left and right absorbent body parts divided by the dividing part 11 are separated by a predetermined separation width, so that the left and right absorbent body parts have their proximal ends separated by a predetermined separation width.
  • the dividing part 11 As a base axis, it becomes easy to deform in the width direction, diagonal direction, twisting direction, etc. Moreover, when the dividing part 11 is formed by the cut part 11b, the separation width between the left and right absorbent body parts is very small, so that the absorbency of body fluids is excellent.
  • the dividing portion 11 is formed with a cutout portion 11a whose dividing width gradually increases toward the rear end, as shown in FIG.
  • the left and right absorbent body parts divided by the dividing part 11 are deformed in the width direction, diagonal direction, torsion direction, etc. with the base end part as the basic axis, they can be deformed without interfering with each other,
  • the surface of the sanitary napkin 1 can be maintained in close contact with the skin surface by flexibly responding to intense movements of the left and right buttocks.
  • the friction reducing layer 10 is also provided in the portion divided by the dividing portion 11, similarly to the laminated region of the absorbent body 4.
  • the top sheet 3 and the back sheet 2 are not joined to each other in a portion separated by the dividing portion 11 where the absorbent core 4 is not present.
  • the length L of the dividing part 11 in the napkin longitudinal direction is arbitrary, but if this length L is too short, the function of following the movement of the buttocks will be impaired, and if it is too long, the overall rigidity of the absorbent body 4 will decrease. However, the absorption performance and wearing comfort are impaired, so it is preferable to set the length to 30 to 150 mm.
  • the maximum value M of the dividing width is arbitrary, but if this width M is too small, the distance over which the divided left and right absorbent body parts can move will be small, and the buttocks It becomes difficult to follow the movement of the body, and if it is too large, the absorption performance of body fluids will decrease, so it is preferable to set it to 5 to 30 mm.
  • the rear end portion of the absorbent body 4 is divided into two parts by providing one dividing portion 11 at the center in the width direction, but one dividing portion 11 is further provided on both sides thereof.
  • the rear end portion of the absorbent core 4 may be divided into four or more parts by providing each or a plurality of parts.
  • compressed grooves 14 recessed toward the non-skin side on the skin-contacting surfaces of the left and right absorbent body portions divided by the dividing portion 11.
  • the compressed grooves 14 may be formed by recessing only the absorbent body 4, or may be formed by integrally recessing the members laminated from the skin-contacting surface of the top sheet 3 to the absorbent body 4. .
  • planar shape of the compressed groove 14 is no particular restriction on the planar shape of the compressed groove 14, but for example, as shown in FIG.
  • each absorbent body portion divided by the dividing portion 11 It may be formed into a planar shape that extends in a straight line and has a tip end curved inward in the width direction in a spiral shape or an arc shape at the end portion of each absorbent body portion divided by the dividing portion 11. can.
  • a linear compression groove diagonally across each absorbent body part divided by the dividing part 11 from the base end of the dividing part 11, a predetermined area behind the base end of the absorbent body part is arranged.
  • the distal end of this absorbent body portion is reinforced by arranging a compressed groove made of a spiral or arcuate curved line at the distal end.
  • an easily deformable portion 15 extending in the width direction may be provided at the base end of the absorber portion divided by the dividing portion 11.
  • the easily deformable portion 15 is formed by a compressed portion recessed toward the non-skin side of the absorbent body 4 or a thin portion with a reduced amount of pulp stacked.
  • the easily deformable portion 15 can be formed by a linear compressed portion or a thin wall portion, as shown in FIG. 5A.
  • the absorbent body portion divided by the dividing portion 11 is easily deformed up and down (toward the skin side and the non-skin side) with the easily deformable portion 15 as the base end.
  • the width of the easily deformable portion 15 in this form is preferably 1 to 4 mm.
  • the easily deformable portion 15 may be formed by a compressed portion or a thin portion having a certain width, as shown in FIG. 5C.
  • the absorbent body portion divided by the dividing part 11 with the easily deformable part 15 as the base end is easily deformed up and down, and the easily deformable part 15 has a certain degree of deformation. Because of the width, the divided portion also swings in the rotational direction as shown by the arrow in the figure. Therefore, it is possible to flexibly respond to complex movements of the buttocks, and more reliably maintain the state in which the surface of the sanitary napkin 1 is in close contact with the buttocks.
  • the width of the easily deformable portion 15 in this form is preferably 5 to 10 mm. Moreover, it is more preferable that the easily deformable part 15 is formed by a thin part with a reduced amount of pulp stacked so that each absorbent body part divided by the dividing part 11 can easily swing and deform.
  • the easily deformable portion 15 is preferably provided continuously over the entire width of the absorbent core 4 from the base end of the divided portion 11 to the side edge of the absorbent core 4; It may be arranged at a predetermined distance from the side edge of the plate, or compressed portions or thin-walled portions may be provided intermittently.
  • the friction-reducing layer 10 is a layer that has the function of reducing the friction or frictional force between two objects that come into contact with each other by being present between the two objects.
  • the layer is configured such that the friction between the back sheet 2 and the absorbent body 4 (enveloping sheet 5) is smaller than the friction between the two when the friction reducing layer 10 is not provided thereon. can do.
  • the friction-reducing layer 10 can be obtained by applying a friction-reducing treatment to at least one of the back sheet 2 and the absorbent body 4 (enveloping sheet 5), as shown in FIG. 3.
  • the friction-reducing layer 10 is formed only on the skin-side surface of the back sheet 2, but it can be formed on either or both of the skin-side surface of the back sheet 2 and the non-skin-side surface of the absorbent body 4.
  • the friction reduction treatment can be performed, for example, by applying a material (composition) containing a substance capable of imparting lubricity, or a material consisting of a substance capable of imparting lubricity.
  • substances capable of imparting lubricity include organic substances such as silicone resins, fluororesins, and polyacetal resins, and inorganic substances such as talc, silica, and mica.
  • the form of the applied material is not limited, and may be in the form of a solution, emulsion, suspension, etc., or may be in the form of a powder.
  • the amount of the friction reducing layer 10 formed by the friction reducing treatment may be about 0.1 to 30.0 g/m 2 (dry state).
  • the friction-reducing layer 10 can be formed of a sheet body separate from the back sheet 2 and absorbent body 4.
  • the material of the friction-reducing layer 10 is not particularly limited as long as it can reduce friction between the back sheet 2 and absorbent body 4 (enveloping sheet 5) and allow them to slide relatively in a direction along the contact surface.
  • the friction-reducing layer 10 can be a sheet body formed by applying a friction-reducing treatment to at least a part of at least one surface of a base sheet 10b to form a friction-reducing treatment portion 10a.
  • the friction reduction layer 10 as a sheet-like body may have a friction reduction treatment portion 10a provided on the back sheet 2 side of the base sheet 10b. This makes it easier to relatively slide the skin-side surface of the backsheet 2 and the non-skin-side surface (friction reduction treated portion 10a) of the friction reduction layer 10.
  • the skin-side surface of the friction-reducing layer 10 may or may not be adhered to the absorber 4 (covering sheet 5).
  • the friction reducing layer 10 which is a separate body, can be prevented from shifting.
  • FIGS. 6B and 6C show a modification of the friction reducing layer 10 which is a sheet-like member.
  • the friction reduction layer 10 may have a friction reduction treatment portion 10a provided on the skin side of the base sheet 10b.
  • the underwear-side surface of the absorber 4 and the skin-side surface of the friction-reducing layer 10 are relatively easy to slide.
  • the surface of the friction-reducing layer 10 on the underwear side may or may not be adhered to the backsheet 2.
  • the friction reducing treated portions 10a may be provided on both the skin side and non-skin side of the base sheet 10b. Thereby, friction on both sides of the base sheet 10b can be reduced.
  • the friction reduction layer 10 is applied to the non-skin side of the absorber 4 (covering sheet 5) and the skin side of the backsheet 2, whichever has lower sliding friction with the friction reduction treated portion 10a. and slide.
  • the above-mentioned relative sliding occurs on at least one of the absorber 4 side and the backsheet 2 side of the friction reducing layer 10.
  • the base sheet 10b may include a thermoplastic resin or a film formed from a combination of thermoplastic resins, a planar body containing fibers such as woven fabric or nonwoven fabric, a planar body containing pulp, or a laminate thereof. can be used.
  • thermoplastic resin used as the material for the base sheet 10b include olefins such as polyethylene and polypropylene, polyester, and polyvinyl alcohol, with polyethylene being preferred because it is inexpensive and has good processability.
  • FIG. 7 shows yet another modification of the friction reducing layer 10.
  • the entire friction reducing layer 10 is made of a sheet-like material made of a material containing or consisting of a substance capable of imparting lubricity, such as a silicone resin, a fluororesin, or a polyacetal resin. It can also be a body. In that case, a sheet made of silicone resin or fluororesin is preferable.
  • the friction-reducing layer 10 can be formed from a substantially uniform material over the thickness direction, even if the surface of the friction-reducing layer 10 is peeled off for some reason during installation, the layer remains intact. Friction reduction effect is less likely to be lost.
  • the friction reduction layer 10 or the friction reduction treatment portion 10a may be provided continuously or discontinuously, that is, in a plurality of regions. They may be divided into two and arranged side by side.
  • the static friction coefficient of the friction reducing layer 10 with respect to the back sheet 2 is preferably 98% or less, more preferably 90% or less, and 75% or less of the static friction coefficient of the absorber 4 with respect to the back sheet 2 measured under the same conditions. It is more preferable that it exists, and even more preferably that it is 60% or less. Further, the static friction coefficient of the absorber 4 with respect to the friction reducing layer 10 is preferably 90% or less, more preferably 80% or less, of the static friction coefficient of the absorber 4 with respect to the backsheet 2 measured under the same conditions, It is more preferably 65% or less, and even more preferably 50% or less.
  • the dynamic friction coefficient of the friction reducing layer 10 with respect to the backsheet 2 is preferably 98% or less, more preferably 90% or less, and 75% or less of the dynamic friction coefficient of the absorber 4 with respect to the backsheet 2 measured under the same conditions. It is more preferable that it exists, and even more preferably that it is 60% or less. Further, the dynamic friction coefficient of the absorber 4 with respect to the friction reducing layer 10 is preferably 80% or less, more preferably 50% or less, and more preferably 30% or less of the dynamic friction coefficient of the absorber 4 with respect to the backsheet 2 measured under the same conditions. It is more preferably at most 10%, even more preferably at most 5%.
  • friction reducing layer 10 there is one friction reducing layer 10, but two or more friction reducing layers 10 may be provided. In that case, two or more of the above-described configurations of the friction reducing layer 10 can be arbitrarily combined.
  • the thickness of the friction reducing layer 10 may be approximately 50 to 1000 ⁇ m.
  • the thickness is preferably 50 to 500 ⁇ m.
  • the thickness (the total when it includes a plurality of sheet-like bodies) may be 100 to 1000 ⁇ m. preferable.
  • the friction reducing layer 10 is formed by applying a friction reducing treatment of applying a silicone resin or the like, the silicone resin or the like is prevented from penetrating into the backsheet 2, and the friction reducing layer 10 is formed on the surface of the backsheet 2. It is preferable to use an air-impermeable film as the backsheet 2 in order to ensure that this is formed.
  • the adhesive area between the top sheet 3 (second sheet 6) and the absorbent body 4 (covering sheet 5) may be bonded by applying an adhesive to the entire surface of the absorbent body 4 facing the top sheet 3.
  • a range on the rear side in the longitudinal direction including the rear end where the dividing portion 11 is provided is set as a non-adhesive region that is not bonded to the top sheet 3, and from this area in the longitudinal direction
  • the area on the front side may be an adhesive area bonded by applying an adhesive or the like.
  • the anti-slip adhesive layer 8 is provided along the longitudinal direction of the sanitary napkin 1, one strip on each side of the divided portion 11. It is preferable to extend from the region to a region overlapping with the absorber portion divided by the dividing portion 11. As a result, the absorbent portion of the underwear separated by the dividing portion 11 and the backsheet 2 are fixed, and when the underwear moves due to the movement of the wearer's body, the absorbent portion slides against the backsheet 2. It becomes easier.

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dermatology (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

Afin de fournir un article absorbant qui permet non seulement de réduire les problèmes cutanés en empêchant de manière fiable des frictions entre une surface d'article absorbant et une surface cutanée mais également d'empêcher une fuite en améliorant l'ajustement à une région glutéale, un absorbeur (4) est stratifié sur un côté peau d'une feuille arrière (2), la feuille arrière (2) et l'absorbeur (4) ne sont pas assemblés, une couche de réduction de frottement (10) est située entre la feuille arrière (2) et l'absorbeur (4), et une section d'extrémité arrière de l'absorbeur (4) est divisée en de multiples parties dans le sens de la largeur par une partie de division (11) s'étendant dans le sens de la longueur d'une serviette hygiénique (1). Lorsqu'un sous-vêtement est déplacé par le mouvement du corps d'un utilisateur, le mouvement du sous-vêtement est absorbé lorsque l'absorbeur (4) et la feuille arrière (2) coulissent l'un avec l'autre de telle sorte qu'il est moins probable que le mouvement de la feuille arrière (2) soit transmis à l'absorbeur (4). Les parties absorbantes respectives divisées par la partie de division (11) peuvent suivre de manière flexible différents mouvements des côtés droit et gauche de la région glutéale tout en coulissant par rapport à la feuille arrière (2).
PCT/JP2023/009901 2022-09-22 2023-03-14 Article absorbant WO2024062655A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022150920A JP2024045864A (ja) 2022-09-22 2022-09-22 吸収性物品
JP2022-150920 2022-09-22

Publications (1)

Publication Number Publication Date
WO2024062655A1 true WO2024062655A1 (fr) 2024-03-28

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Family Applications (1)

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PCT/JP2023/009901 WO2024062655A1 (fr) 2022-09-22 2023-03-14 Article absorbant

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Country Link
JP (1) JP2024045864A (fr)
TW (1) TW202412725A (fr)
WO (1) WO2024062655A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06296644A (ja) * 1993-02-22 1994-10-25 Mcneil Ppc Inc 吸収性物品
JP2008012058A (ja) * 2006-07-05 2008-01-24 Hakujuji Co Ltd 使い捨て吸収性物品
WO2008078805A1 (fr) * 2006-12-27 2008-07-03 Daio Paper Corporation Article absorbant
JP2016119989A (ja) * 2014-12-24 2016-07-07 ユニ・チャーム株式会社 吸収性物品
JP2020048976A (ja) * 2018-09-27 2020-04-02 大王製紙株式会社 吸収性物品

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06296644A (ja) * 1993-02-22 1994-10-25 Mcneil Ppc Inc 吸収性物品
JP2008012058A (ja) * 2006-07-05 2008-01-24 Hakujuji Co Ltd 使い捨て吸収性物品
WO2008078805A1 (fr) * 2006-12-27 2008-07-03 Daio Paper Corporation Article absorbant
JP2016119989A (ja) * 2014-12-24 2016-07-07 ユニ・チャーム株式会社 吸収性物品
JP2020048976A (ja) * 2018-09-27 2020-04-02 大王製紙株式会社 吸収性物品

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TW202412725A (zh) 2024-04-01

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