JP2020069035A - Absorbent article - Google Patents

Abstract

To provide an absorbent article which can suppress leakage by improving fitting properties to an excretion port while suppressing a reduction in touch feeling to legs in wearing.SOLUTION: An absorbent article (1) includes a top sheet (10) facing a skin of a wearer. The top sheet includes a center sheet (11) arranged in a center in a width direction of the absorbent article and a side sheet (12) arranged outside in a width direction relative to the center sheet. The side sheet includes a non-folding-back part (12A) and a folding-back part (12B) which is folded back to a non-skin surface side in an outside edge of the side sheet. In a region extending from the outside edge of the side sheet to the inside in the width direction, a raised part (15) in which the folding-back part is not joined to a non-skin surface side sheet positioned on the non-skin surface side relative to the folding-back part is provided. A dynamic friction coefficient of the center sheet under a wet condition where the top sheet is wet is higher than a dynamic friction coefficient of the side sheet under the wet condition.SELECTED DRAWING: Figure 2

Description

  The present invention relates to absorbent articles such as sanitary napkins.

  Conventionally, a sanitary napkin as an absorbent article has been known. For example, Patent Document 1 discloses an absorbent article having an absorbent core and a topsheet arranged on the skin side of the absorbent core, and the topsheet being blended with cotton fibers. In the absorbent article of Patent Document 1, since the topsheet is blended with cotton fibers, the touch feeling of the topsheet can be improved.

JP, 2010-269029, A

  Generally, a top sheet having cotton fibers is soft against the skin before wetting and can improve the touch feeling, while the friction coefficient after wetting tends to be high and the touch feeling when rubbing against the skin is reduced. There was a risk of In particular, when worn, the legs of the wearer and the outer portion of the absorbent article are easily rubbed, and the feel of the legs may be reduced.

  Further, it is considered that the absorbent article is made of a top sheet having no cotton fiber to reduce the coefficient of friction when wet. However, if the coefficient of friction when wet is low, the fit property with respect to the excretory opening is deteriorated, which may cause leakage.

  Therefore, it is possible to provide an absorbent article capable of improving fitability to an excretory opening and suppressing leakage while suppressing a reduction in touch feeling against a leg when worn.

  The absorbent article according to one aspect has a front-rear direction and a width direction orthogonal to each other, and a top sheet directed to a wearer's skin, and the top sheet is provided at the center of the width direction of the absorbent article. An absorbent article having a center sheet arranged and a side sheet arranged outside the center sheet in the width direction, wherein the side sheet has a non-folded portion and an outer edge of the side sheet. In the region extending inward in the width direction from the outer edge of the side sheet, the folded portion has a folded portion folded back toward the non-skin surface side, and the folded portion is closer to the non-skin surface side than the folded portion. An upright portion that is not joined to the non-skin side sheet located at is provided, and the dynamic friction coefficient of the center sheet when the top sheet is wet is Higher than the dynamic friction coefficient of definitive the side sheet.

FIG. 1 is a plan view of the absorbent article according to the embodiment as viewed from the skin surface side. FIG. 2 is a sectional view taken along the line FF shown in FIG. FIG. 3 is a diagram schematically showing a worn state in a cross section taken along line FF shown in FIG. 1. FIG. 4 is an enlarged view of the outer edge of the center seat and the outer edge of the side seat. FIG. 5 is a table showing the evaluation results of the surface characteristics by the dynamic friction coefficient of the top sheet.

(1) Outline of Embodiments At least the following matters will be made clear by the present specification and the description of the accompanying drawings.
The absorbent article according to one aspect has a front-rear direction and a width direction orthogonal to each other, and a top sheet directed to a wearer's skin, and the top sheet is provided at the center of the width direction of the absorbent article. An absorbent article having a center sheet arranged and a side sheet arranged outside the center sheet in the width direction, wherein the side sheet has a non-folded portion and an outer edge of the side sheet. In the region extending inward in the width direction from the outer edge of the side sheet, the folded portion has a folded portion folded back toward the non-skin surface side, and the folded portion is closer to the non-skin surface side than the folded portion. An upright portion that is not joined to the non-skin side sheet located at is provided, and the dynamic friction coefficient of the center sheet when the top sheet is wet is Higher than the dynamic friction coefficient of definitive the side sheet.

  The center sheet is arranged in contact with the excretion opening. Since the center sheet has a high coefficient of kinetic friction when wet, it is possible to maintain fit to the excretory opening and suppress leakage. The side seats are arranged in contact with the legs of the wearer. Since the side sheet has a low coefficient of dynamic friction when wet, when the outer portion of the absorbent article and the leg are rubbed, there is little friction with the skin, and it is possible to suppress deterioration of the feeling of touch. Further, a certain area extending in the width direction from the outer edge of the side sheet has an upright portion that is upright on the skin surface side, and is configured to be upright on the non-skin surface side sheet. Therefore, it is possible to prevent the outer portion of the absorbent article positioned outside the top sheet in the width direction from coming into contact with the skin, and to suppress the deterioration of the feeling of touch when the outer portion of the absorbent article and the leg rub against each other. Therefore, it is possible to improve the fit to the excretory opening and suppress leakage while suppressing the reduction in the comfort of touching the leg when worn.

  According to a preferred aspect, the non-folded portion of the side sheet may be located closer to the skin surface than the center sheet.

  It is possible to further suppress deterioration in touch feeling when the outer portion of the absorbent article and the leg rub against each other. Further, since the non-folded portion is located on the skin surface side of the center sheet, a wall formed by the non-folded portion can be provided outside the center sheet in the width direction, and lateral leakage can be suppressed.

  According to a preferred aspect, the non-folded portion of the side sheet is located closer to the non-skin surface side than the center sheet, and a center non-joined region where the outer portion of the center sheet is not joined to the side sheet. May be provided.

  By providing the center non-bonding region, the outer edge of the center sheet is easily deformed flexibly, and even when the center sheet hits the leg, it is possible to suppress deterioration of the touch.

  According to a preferred aspect, the length of the upright portion in the width direction may be longer than the length of the center non-bonding region in the width direction.

  In the center non-bonding region, a wall where the center sheet further rises from the side sheet can be formed. Therefore, a standing portion that stands up to the skin surface side and a wall where the center sheet further stands up to the skin surface side from the side sheets in the standing portion are formed, and leakage can be further suppressed. Since the width in the width direction of the wall in which the center sheet stands up to the skin surface side is relatively short, the standing portion is likely to stand up, and the standing portion is more likely to stand up to the skin surface side.

  According to a preferred embodiment, the extension sheet extends outward in the width direction from the top sheet, and has an extension sheet that is directed toward the wearer's skin, and the coefficient of dynamic friction of the extension sheet when wet is the above. It may be lower than the dynamic friction coefficient of the top sheet when wet.

  Even when the extension sheet touches the legs during wearing, it is possible to suppress the deterioration of the touch due to the extension sheet. In particular, the effect can be suitably exerted when wearing underwear such as boxer shorts in which the extending sheet cannot be folded back to the non-skin surface side.

  According to a preferred aspect, the center sheet may include water-retaining fibers, and the side sheets may include thermoplastic resin fibers.

  The center sheet having the water-retaining fibers can easily hold the body fluid and can suppress the diffusion of the body fluid to the side sheet side. Since the side sheet does not hold too much body fluid, the skin is unlikely to be in a wet state via the side sheet, and it is possible to suppress deterioration in the feeling of touch when the outer portion of the absorbent article and the leg are rubbed.

  According to a preferred aspect, the center sheet has a first layer and a second layer located on the non-skin surface side of the first layer, and the water-retaining fiber is on the first layer side. The thermoplastic resin fibers may be biased, and the thermoplastic resin fibers may be biased toward the second layer side, and the water retention fibers may be cotton fibers.

  The cotton fibers are eccentrically arranged in the first layer that comes into direct contact with the skin, and the touch can be improved. Further, the thermoplastic resin fibers are arranged in the second layer separated from the skin, and the fibers can be heat-welded to each other by the thermoplastic fibers in the portion which does not come into direct contact with the skin. Improves the joint strength of the fibers in the center sheet, prevents the fibers of the center sheet from decomposing even after long-term use, and suppresses the decrease in the feel of the legs when worn, while improving the fit to the excretory opening. Therefore, the effect of suppressing leakage can be continuously obtained.

  According to a preferred embodiment, the absorbent core has a non-skin surface side of the center sheet, at least the absorbent core and a compressed portion of the center sheet compressed in the thickness direction, the absorbent core, pulp And a high-absorbent polymer, the compression unit has a pair of front and rear compression units extending in the front-rear direction and arranged at intervals in the width direction, the width direction than the front-back compression unit. The grammage of the superabsorbent polymer in the first region located on the outer side of may be higher than the grammage of the superabsorbent polymer in the second region sandwiched by the front and rear pressing parts.

  When the absorbent article is worn and sandwiched between the legs of the wearer, a force is applied to the absorbent article inward in the width direction. The first region stands up on the skin surface side with respect to the second region with the front-rear squeezed portion as a base point, and easily hits the wearer's leg. The first region has a high basis weight of the superabsorbent polymer, and tends to expand when wet and have a high cushioning property. Therefore, it is possible to soften the contact of the wearer with the leg and suppress the deterioration of the touch feeling.

  According to a preferred embodiment, the center sheet may have an absorbent core located on the non-skin surface side, and the at least a part of the upright portion may be located outside the absorbent core in the width direction.

  An absorbent article such as a napkin having a wing has an area outside the absorbent core in the width direction fixed to the non-skin surface side of the underwear. Since the standing part that stands up on the wearer side is provided outside the absorbent core having high rigidity in the width direction, the standing part becomes easier to stand up when the absorbent article is attached to the underwear.

  According to a preferred embodiment, the center sheet has an absorbent core located on the non-skin surface side, and at least the absorbent core and a compressed portion obtained by compressing the center sheet in the thickness direction, and the compressed portion includes: It has a pair of front and rear compression parts that extend in the front-rear direction and are spaced apart in the width direction, and the center sheet and the side seats in the thickness direction on the outer side in the width direction with respect to the front and rear compression parts. A compressed sheet press may be formed.

  The center seat and the side seats can be joined by the seat squeezing section, and even if the center seat and the side seats are configured by separate members, the top seat is not disassembled, while suppressing a reduction in the feel of the legs when worn, It is possible to continue to obtain the effect of improving the fit to the excretory opening and suppressing leakage.

  According to a preferred embodiment, the center sheet has an absorbent core located on the non-skin surface side, and the standing portion has the width larger than that of the high basis weight portion having the highest basis weight of the absorbent material in the absorbent core. It may be located outside the direction.

  The absorbent article before use is folded around a folding line as a base point, and a plurality of the absorbent articles are stacked in the thickness direction and housed in a housing body. Alternatively, instead of being folded around the folding line as a base point, they are stacked in the thickness direction and stacked inside the container. Further, in the absorbent article, the high basis weight portion having the thickest absorbent core and the thickest absorbent core is pressed in the laminated state. Since the upright portion is located outside the high basis weight portion in the width direction, the upright portion is unlikely to be crushed even when pressure is applied to the high basis weight portion, and the uprightness is easily maintained.

(2) Configuration of Absorbent Article Hereinafter, the absorbent article according to the embodiment will be described with reference to the drawings. The absorbent article may be an absorbent article such as a sanitary napkin, panty liner, breast milk pad, adult incontinence pad, fecal pad or sweat removal sheet. In particular, the absorbent article may be an article that is attached to and used inside a worn article, such as a user's underwear.

  In the following description of the drawings, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratios of the respective dimensions may be different from the actual ones. Therefore, specific dimensions should be determined in consideration of the following description. In addition, there may be a case where the drawings have some different dimensional relationships and ratios.

  FIG. 1 is a plan view of an absorbent article 1 according to the embodiment viewed from the skin surface side. Here, the “skin surface side” corresponds to the side facing the wearer's skin during use. The "non-skin side" corresponds to the side facing away from the wearer's skin during use. FIG. 2 is a sectional view taken along the line FF shown in FIG. In FIG. 2, for the sake of convenience of description, a compression unit described later is omitted.

  The absorbent article 1 has a front-back direction L and a width direction W. The front-rear direction L is a direction extending from the front side (abdominal side) of the wearer to the rear side (back side), or a direction extending from the rear side of the wearer to the front side. The width direction W is a direction orthogonal to the front-rear direction L.

  The absorbent article 1 includes a front region R1, a rear region R2, and a central region R3. The central region R3 is disposed so as to straddle the center of the absorbent article in the front-rear direction, and includes an excretory opening contact portion that faces the excretory opening (eg, vaginal opening) of the wearer. When the absorbent article 1 is attached to underwear, the central region R3 is located in the crotch portion of the underwear and is located in the wearer's crotch, that is, between the wearer's legs.

  The front region R1 is located on the front side of the central region R3. The front edge of the front region R1 defines the front edge of the absorbent article 1. The rear region R2 is located rearward of the central region R3. The rear edge of the rear region R2 defines the rear edge of the absorbent article 1.

  The wings 3 may be provided in the central region R3. Further, the rear region R2 may be provided with a hip flap that bulges outward in the width direction W. The front end edge of the wing 3 is defined by the root of the wing 3, and corresponds to the portion located on the front side of the two innermost recessed portions in the width direction W. The front edge of the wing 3 may define the boundary between the central region R3 and the front region R1. The rear end edge of the wing 3 is defined by the root of the wing 3, and corresponds to the portion located on the rear side of the two innermost recessed portions in the width direction W. The rear edge of the wing 3 may define the boundary between the central region R3 and the rear region R2.

  The absorbent article 1 includes at least a topsheet 10 facing the wearer's skin, a non-skin side sheet 20 arranged on the non-skin side of the top sheet 10, and an absorbent core 31. The top sheet 10 is provided on the skin surface side T1 with respect to the absorbent core 31. The topsheet 10 may extend in the front-rear direction L from the front region R1 to the rear region R2.

  The top sheet 10 has a center sheet 11 arranged in the center of the absorbent article in the width direction and a side sheet 12 arranged outside the center sheet 11 in the width direction. The center sheet 11 and the side sheet 12 are configured to contact the skin on the skin surface side T1 of the absorbent core 31. The center sheet 11 may cover the central portion of the absorbent core 31 in the width direction W. The side sheet 12 may be arranged on the non-skin surface side T2 with respect to the center sheet 11, or may be arranged on the skin surface side T1 with respect to the center sheet 11. The side sheet 12 of the present embodiment is arranged closer to the non-skin surface side T2 than the center sheet 11.

  The side sheet 12 has a non-folded back portion 12A and a folded back portion 12B folded back toward the non-skin surface side T2 at an outer edge 12E of the non-folded back portion 12A. The outer edge of the non-folded portion 12A constitutes an outer edge 12E of the side seat 12. The folded-back portion 12B is located closer to the non-skin surface side than the non-folded-back portion 12A. Other members may not be arranged between the non-folded portion 12A and the folded portion 12B, or members such as the center sheet and the absorbent core may be arranged.

The center sheet 11 contains a water retention fiber. Examples of the water-retaining fibers include cotton fibers. The center sheet 11 is formed by hydroentangling water-retaining fibers. The fiber diameter of the cotton fibers may be 0.9-1.2 Dtex and the fiber length of the cotton fibers may be 25.4-29.4 mm. The center sheet 11 can be exemplified by a cotton nonwoven fabric. The cotton non-woven fabric may have a basis weight of 30 g / m 2. The center sheet 11 contains water-retaining fibers (eg, cotton and rayon), and its basis weight may be 20 to 50 g / m 2. If the basis weight of the center sheet 11 is less than 20 g / m ² , the touch may be deteriorated. If the basis weight of the center sheet 11 is greater than 50 g / m ^2, too much body fluid may be retained and rewet may occur. .

  The side sheet 12 contains a heat-fusible fiber. The side sheet 12 is formed by fusing heat-fusible fibers. The side sheet 12 has a non-folded portion that is not folded back to the non-skin surface side T2, and a folded portion that is folded back toward the non-skin surface side T2 at the outer edge 12E of the side sheet 12. The folded portion of the side sheet 12 is joined to the non-skin side sheet 20.

  The non-skin side sheet 20 is joined to the folded portion 12B of the side sheet 12. The non-skin side sheet 20 may extend outward in the width direction with respect to the top sheet 10 (center sheet 11 and side sheets 12). The non-skin side sheet 20 is arranged on the non-skin side T2 of the center sheet 11 and the side sheet 12, and does not cover the center sheet 11 and the side sheet 12. The non-skin side sheet 20 of the present embodiment extends outward in the width direction with respect to the top sheet 10 and faces the wearer's skin, and constitutes the extension sheet of the present invention.

  The non-skin side sheets 20 may be provided in a left-right pair with a space in the width direction W. The inner edge 20I of the non-skin surface side sheet 20 does not reach the center of the absorbent article in the width direction, may match the inner edge of the folded portion 12B, or may be wider than the outer edge of the absorbent core 31 in the width direction. It may be located inside. The non-skin side sheet 20 may be composed of a non-woven fabric having a thermoplastic fiber resin. The thermoplastic resin fiber has hydrophobicity and may be coated with a water repellent.

  The back sheet 25 may be disposed on the non-skin surface side T2 of the non-skin surface side sheet 20. The backsheet 25 covers the non-skin surface of the absorbent core 31. That is, the absorbent core 31 may be arranged between the backsheet 25 and the topsheet 10. The back sheet 25 is a liquid impermeable sheet. The back sheet 25 is a non-stretchable polyethylene sheet, a laminated non-woven fabric mainly made of polypropylene or the like, a breathable resin film, a sheet in which a breathable resin film is bonded to a non-woven fabric such as spunbond or spunlace, stretchable The urethane film, non-woven fabric containing nanofibers, etc. can be used.

  The absorbent core 31 is arranged at least in the central region R3 and the rear region R2. Moreover, the absorbent core 31 may extend from the central region R3 to the front region R1. The absorbent core 31 includes an absorbent material that absorbs liquid. The absorbent core 31 may be wrapped with a core wrap. The absorbent material forming the absorbent core 31 can be formed of, for example, hydrophilic fibers, pulp, and super absorbent polymer (SAP). The absorbent core 31 of the present embodiment has pulp and SAP. The core wrap can be made of, for example, a non-woven fabric or a tissue sheet.

  As shown in FIG. 2, the absorbent core may include a high basis weight portion 33 in which the basis weight of the absorbent material is high, and a low basis weight portion 34 in which the basis weight is lower than that of the high basis weight portion 33. The high basis weight portion 33 may be arranged so as to straddle the center of the absorbent core in the width direction, and may be arranged between the pair of front and rear pressing portions 65.

  As described above, the absorbent article 1 has the wings 3. The wings 3 extend outward in the width direction W from the outer edges of the absorbent core 31 in the central region R3. The wings 3 may be formed by stacking the non-skin side sheet 20 and the back sheet 25. The wings 3 are configured to be capable of being folded back to the back seat 25 side. The wing 3 is folded back to the non-skin side of the crotch part of the underwear when used.

  The absorbent article 1 has at least the squeezing portion 60 obtained by compressing the top sheet 10 and the absorbent core 31 in the thickness direction. In the compression unit 60, at least the top sheet 10 and the absorbent core 31 may be compressed, and sheets other than these (for example, core wrap) may be compressed. As shown in FIG. 1, the squeezing portions 60 extend in the front-rear direction, and are provided in a pair at intervals in the width direction. The front-rear compression unit 65 is provided in the central region and is formed by compressing at least the center sheet 11 and the absorbent core 31.

  The folded portion 12B of the side sheet 12 is joined to the non-skin surface side sheet 20 located on the non-skin surface side of the folded portion 12B in a region extending inward in the width direction from the outer edge 12E of the side sheet 12. The standing part 15 which is not provided is provided. The upright portion 15 is configured by a non-joining region R12 where the folded-back portion 12B of the side sheet 12 and the non-skin surface side sheet 20 are not joined. A joint region R11 in which the folded portion 12B is joined to the non-skin side sheet 20 is provided inside the non-joint region R12 in the width direction. The joining region R11 is a region in which the joining portion 14 that joins the folded portion 12B and the non-skin surface side sheet 20 is provided in a plan view. The non-bonding region R12 is a region where the bonding portion 14 is not provided outside the bonding portion 14 in the width direction in a plan view. In addition, in the form in which the plurality of joints 14 are formed, the non-joint region R12 is a region outside in the width direction with respect to the joint 14 located at the outermost side in the width direction among the plurality of joints. The joining region R11 is provided apart from the folding line of the side sheet 12. The upright portion 15 of the non-bonded region R12 can be upright on the skin surface side with the bonded portion 14 as a base point.

  Next, based on FIG. 3, the absorbent article in a worn state will be described. FIG. 3 schematically shows a state in which the absorbent article 1 is worn on the underwear S in a cross section taken along the line FF shown in FIG. As shown in FIG. 3, in the state in which the absorbent article is worn, the center in the width direction of the absorbent article is arranged on the skin surface side T1 of the underwear S, and the wings 3 of the absorbent article are on the non-skin surface side. Has a wing adhesive portion (not shown), is folded back to the non-skin surface side T2 of the underwear S, and is fixed to the non-skin surface side of the underwear. The upright portion 15 of the absorbent article is configured to be upright with respect to the non-skin surface side sheet 20, and easily hits the inside of the leg when worn.

  The absorbent article according to the present invention is configured to improve the fit to the excretory opening and suppress leakage while suppressing a reduction in the comfort of touching the leg when worn. The dynamic friction coefficient of the center sheet 11 when the top sheet is wet is higher than the dynamic friction coefficient of the side sheet 12 when wet. The center sheet 11 is placed in contact with the excretion opening. Since the center sheet 11 has a high coefficient of dynamic friction when wet, it is possible to maintain fit to the excretory opening and suppress leakage. Further, the side seats 12 are arranged in contact with the legs of the wearer. Since the side sheet 12 has a low coefficient of dynamic friction when wet, when the outer portion of the absorbent article 1 rubs the legs, there is little friction on the skin, and it is possible to suppress deterioration of the touch feeling.

  Further, a certain region extending in the width direction from the outer edge of the side sheet has a standing portion 15 standing on the skin surface side, and is configured to be able to stand on the non-skin surface side sheet. Therefore, it is possible to suppress the contact of the outer side of the absorbent article positioned outside the top sheet 10 in the width direction with the skin, and to suppress the deterioration of the feeling of touch when the outer side of the absorbent article and the legs rub against each other. Therefore, it is possible to improve the fit to the excretory opening and suppress leakage while suppressing the reduction in the comfort of touching the leg when worn.

Here, the dynamic friction coefficient when wet can be measured by the following method. The center sheet and the side sheet of the absorbent article are cut, and a sample having a width direction of 40 mm and a front-back direction of 80 mm is cut out. If the adhesive cannot be separated by an adhesive such as an HMA type adhesive, the adhesive is washed off with toluene and then dried in the atmosphere for 24 hours. The end portion 10 mm in the front-rear direction of each sample is fixed to a horizontal plate with gum tape (Askul Co., Ltd .: "On-site power" cloth tape 0.26 mm thick width 50 mm x length 25 m roll). Kanakin (50mm × 40mm, JIS L 0803 compliant, attached white cloth for dyeing fastness test) with a digital force gauge (Nidec Shinpo Co., Ltd., FGP-2) and 10mm edge jointed on each sample, Japan Foundation Standards Association, single fiber cloth) is installed. Furthermore, a 525-g weight, which is a rectangular parallelepiped with a bottom surface of 35 mm × 25 mm, is placed from above. The maximum value displayed when the kanakin moistened with a predetermined amount of ion-exchanged water was moved approximately 30 mm on the sheet at 100 mm / min was defined as the dynamic friction force. At this time, kanakin should be applied to the surface of each sample facing the wearer. In this measuring method, wet skin is reproduced by wetting the kanakin. The skin moisture content to be reproduced should be 60% when wet. Therefore, the predetermined amount of ion-exchanged water is 60 wt /% with respect to the weight of kanaquin. Specifically, in the case of a 40 mm * 50 mm kanakin with 50 units, it is 0.06 mL (50 g / m ² * 0.04 m * 0.05 m * 60%). If the sheet cannot be sampled with the above width, a sample is sampled with the maximum width that can be sampled and evaluated. When a weight that fits within the seat area and that weighs 30 g / cm2 and a kanakin with a weight width of +10 mm (connecting part of the digital force gauge) are placed on it and the maximum distance is moved on the seat at 100 mm / min, Let the displayed maximum value be the dynamic friction force.

  In the present embodiment, the coefficient of kinetic friction when the center seat 11 is wet is 0.80, and the coefficient of kinetic friction when the side seat 12 is wet is 0.49. Further, the difference between the dynamic friction coefficient of the center seat and the dynamic friction coefficient of the side seats may be 0.1 or more and 0.25 or less. When the difference in the coefficient of kinetic friction is 0.1 or more, it becomes easier for the user to feel the difference in the surface characteristics between the center seat and the side seats.

  The non-folded portion 12A of the side seat 12 may be located closer to the skin surface side T1 than the center seat 11. It is possible to further suppress deterioration in touch feeling when the outer portion of the absorbent article and the leg rub against each other. Further, since the non-folded portion 12A is located on the skin surface side T1 of the center sheet 11, the wall formed by the upright portion 15 can be provided outside the center sheet 11 in the width direction, and lateral leakage can be suppressed.

  As shown in FIG. 4, in a region where the center sheet 11 and the side sheet 12 overlap, a center joint region RX where the center sheet 11 and the side sheet 12 are joined and a center where the center sheet 11 and the side sheet 12 are not joined The non-bonding region RY is provided. The center joint region RX is located inside the outer edge 11E of the center sheet 11 in the width direction. Therefore, a center non-bonding region RY is provided in a region extending from the outer edge 11E of the center sheet 11 to the inner side in the width direction W.

  The absorbent article is provided with an adhesive area RA to which an adhesive material for joining the center sheet 11 and the side sheet 12 is applied, and a compression section 18 formed on the center sheet. The center joining region RX is a region where the center sheet 11 and the side sheet 12 are joined together. Specifically, only the region where the compression portion 18 and the adhesion region RA overlap in the thickness direction T, and the compression portion 18 is provided. A region and a region where only the adhesion region RA is provided are included. The center non-bonding region RY is a region where the compression portion 18 is not provided and the adhesion region RA is not provided. In addition, in another embodiment, the center joint region RX may be configured only by a region in which the compressed portion is provided, or may be configured by only a region in which the adhesive region is provided.

  When the center non-bonding region RY in which the outer side portion of the center sheet 11 is not bonded to the side sheet 12 is provided, the outer edge of the center sheet 11 is easily deformed and the center sheet 11 hits the leg. Even if it is, it is possible to suppress the deterioration of the touch.

  The length in the width direction of the standing portion 15 may be longer than the length in the width direction of the center non-bonding region RY. In the center non-bonding region RY, a wall where the center sheet 11 further rises from the side sheet 12 can be formed. Therefore, the standing portion 15 where the side sheet 12 stands up and the wall where the center sheet 11 stands further up from the standing portion 15 to the skin surface side are formed, and the leakage can be further suppressed. At this time, since the width in the width direction of the wall in which the center sheet stands on the skin surface side is relatively short, the standing portion easily stands up, and the standing portion easily stands up on the skin surface side.

  At least a part of the standing portion 15 may be located outside the outer edge 31E of the absorbent core 31 in the width direction. An absorbent article such as a napkin having a wing has an area outside the absorbent core in the width direction fixed to the non-skin surface side of the underwear. Since the standing part that stands up on the wearer side is provided outside the absorbent core having high rigidity in the width direction, the standing part becomes easier to stand up when the absorbent article is attached to the underwear.

  The dynamic friction coefficient of the non-skin side sheet 20 as the extension sheet may be lower than the dynamic friction coefficient of the top sheet when wet. Even when the extension sheet touches the legs during wearing, it is possible to suppress the deterioration of the touch due to the extension sheet. In particular, the effect can be suitably exerted when wearing underwear such as boxer shorts in which the extending sheet cannot be folded back to the non-skin surface side.

  The center sheet 11 may have water-retaining fibers, and the side sheet 12 may have thermoplastic resin fibers. The center sheet 11 having the water-retaining fibers can easily retain the body fluid and can suppress the diffusion of the body fluid to the side sheet side. Since the side sheet 12 does not retain excessive body fluid, the skin is unlikely to be in a wet state via the side sheet 12, and it is possible to suppress deterioration of the touch feeling when the outer portion of the absorbent article and the leg are rubbed.

  The center sheet 11 may have a two-layer structure including a first layer 111 and a second layer 112 located on the non-skin surface side of the first layer 111. The water retention fibers may be biased toward the first layer 111 side, and the thermoplastic resin fibers may be biased toward the second layer 112 side. More preferably, the center sheet 11 may be composed of a first layer 111 containing water-retaining fibers and a second layer containing water-retaining fibers and thermoplastic resin fibers. The skin side surface of the first layer 111 constitutes the skin side surface of the center sheet 11. The surface of the first layer 111 on the non-skin side is in contact with the surface of the second layer 112 on the skin side. The non-skin surface side surface of the second layer 112 constitutes the non-skin surface side surface of the center sheet 11. Therefore, the center sheet 11 has a two-layer structure. However, the center sheet 11 may have a single-layer structure having one of the first layer 111 and the second layer 112, or may have a multi-layer structure of three or more layers further including other fiber layers.

  The cotton fibers are eccentrically arranged in the first layer 111 that directly contacts the skin, and the touch can be improved. Further, the thermoplastic resin fibers are arranged in the second layer 112 separated from the skin, and the fibers can be heat-welded to each other by the thermoplastic fibers in the portion which does not come into direct contact with the skin. Improves the joint strength of the fibers in the center sheet, prevents the fibers of the center sheet from decomposing even after long-term use, and suppresses the decrease in the feel of the legs when worn, while improving the fit to the excretory opening. Therefore, the effect of suppressing leakage can be continuously obtained.

  The center sheet 11 of the present embodiment is composed of a laminated sheet of a first layer 111 made of 100% cotton fibers and a second layer 112 made of 80% cotton fibers and 20% heat fusible fibers. Regarding the breaking elongation of the center sheet 11, the strength along the fiber orientation direction may be 30 to 70 N / 25 mm, and the strength in the direction orthogonal to the fiber orientation direction may be 5 to 10 N / 25 mm.

  An example of a method of manufacturing such a center sheet 11 will be described. First, a second fibrous web corresponding to the second layer 112 is formed by the first card machine. The first card machine is a dry roller card that uses single or double cards commonly used to form fiber webs. The second fibrous web comprises water retaining fibers and hydrophobic fibers. Then, a second fibrous web corresponding to the first layer 111 is formed by a second card machine. The second card machine is also a dry type roller card similar to the first card machine. The first fibrous web comprises water retaining fibers. The first fibrous web is laminated on the second fibrous web being conveyed by the conveying device. As a result, a composite fiber web having a two-layer structure in which the first fiber web and the second fiber web are laminated is formed. The ratio of each fiber in each fiber web can be controlled by the ratio of the raw material fibers supplied to each card machine. Next, the composite fiber web having a two-layer structure is subjected to water jet treatment by a water jet treatment machine, and the fibers are entangled with each other. Thereby, the first continuous sheet (spunlace nonwoven fabric) is formed. Here, the water jet treatment is a treatment in which the composite fiber web is placed on a mesh belt that continuously moves, and a high-pressure jet water stream is jetted from the upper surface side of the composite fiber web to entangle the fibers. Then, the 1st continuous sheet which passed the water jet processor is dried by a drier. The dried first continuous sheet is conveyed in the conveying direction by the conveying device and becomes a continuous body forming the center sheet 11. In the center sheet 11 thus configured, the proportion of the water-retaining fibers in the first layer 111 is higher than the proportion of the water-retaining fibers in the second layer 112, and the proportion of the thermoplastic resin fibers in the first layer 111 is the second. It is lower than the proportion of thermoplastic resin fibers in layer 112.

  Further, the fiber density of the second layer 112 is preferably higher than the fiber density of the first layer 111. The fiber density is the density of the number of fibers. Thereby, a fiber density gradient is formed so that the fiber density increases from the first layer 111 toward the second layer 112, and the liquid excrement of the first layer 111 can be strongly drawn into the second layer 112. .. Then, the liquid excrement can be stably transferred to the absorbent core or the like in contact with the non-skin side of the second layer 112.

Here, the fiber density of the sheet is measured, for example, by the following measuring method.
(1) The center sheet 11 is cut into a size of 10 mm × 10 mm to obtain a sample. (2) A cut surface parallel to the thickness direction T of the sample is magnified and observed using a scanning electron microscope (JCM-5100 manufactured by JEOL Ltd.). The magnification is such that the cross section of 30 to 60 fibers can be measured in one screen (example: 150 to 500 times). (3) The observation region is bisected in the thickness direction T into a skin-side layer and a non-skin-side layer, the skin-side layer is the first layer 111, and the non-skin-side layer is the second layer. On top of the layer 112, the number of fiber cross sections in each fiber layer is measured. That is, the number of cross-sections of the cut fiber is counted in the cut surface having a predetermined area. (4) The number of cross sections of the obtained fiber is converted into the number of cross sections of the fiber per 1 mm 2, and this is defined as the fiber density (pieces / mm 2). The measurement is performed at three points, and the average value of the measured values is used as the fiber density of the sample. That is, the density of the number of fibers is used as the fiber density. In other words, the number of fibers per unit area in the cross section parallel to the thickness direction T is used as the fiber density. The number of fibers per unit volume may be used as the fiber density. The number of fibers per unit volume can be obtained by analysis by X-ray CT, for example. Although the fiber density per unit area and the fiber density per unit volume have different numerical values, they are the same in the relative comparison of fiber densities between fiber layers (eg, comparison of size).

  In the region where the absorbent core of the absorbent article is arranged, there are a first region R31 located outside the front and rear compression parts 65 in the width direction, and a second region R32 sandwiched by a pair of front and rear compression parts 65. It is provided. In FIG. 1, the range in the width direction of the first region R31 and the range in the width direction of the second region in the cross section taken along the line FF of FIG. 1 are shown. The basis weight of the superabsorbent polymer in the first region R31 may be higher than the basis weight of the superabsorbent polymer in the second region R32. When the absorbent article is worn and sandwiched by the legs of the wearer, a force is applied to the absorbent article inward in the width direction. As a result, the first region R31 rises on the skin surface side with respect to the second region R32 with the front-rear squeezing portion 65 as a base point, and easily hits the wearer's leg. The first region R31 has a high basis weight of the superabsorbent polymer, and tends to expand when wet and have a high cushioning property. Therefore, it is possible to soften the contact of the wearer with the leg and suppress the deterioration of the touch feeling.

  A sheet compression unit 16 obtained by compressing the center sheet 11 and the side sheets 12 in the thickness direction may be formed on the outer side in the width direction with respect to the front-rear compression unit 65. The center seat 11 and the side seats 12 can be joined by the seat squeezing section 16, and even if the center seat 11 and the side seats 12 are configured by separate members, the top seat 10 is not disassembled and the leg feels when worn. While suppressing the decrease, it is possible to continue to obtain the effect of improving the fit to the excretory opening and suppressing the leakage.

  The standing portion 15 may be located outside the high basis weight portion 33 in which the basis weight of the absorbent material is the highest in the absorbent core 31, in the width direction W. In general, an absorbent article before use is folded in a folding line as a base point, and a plurality of the absorbent articles are stacked in the thickness direction and housed in a housing body. Alternatively, instead of being folded around the folding line as a base point, they are stacked in the thickness direction and stacked inside the container. In the absorbent article, the absorbent core 31 has the largest thickness, and in the stacked state, the high basis weight portion 33 of the absorbent core 31 is pressed. Since the upright portion 15 is located outside the high basis weight portion 33 in the width direction, the upright portion is unlikely to be crushed even when pressure is applied to the high basis weight portion, and the uprightness is easily maintained.

  Next, the evaluation of the surface characteristics by the dynamic friction coefficient of the top sheet will be described. For the evaluation of the surface characteristics, the topsheets according to Examples 1 to 7 and the topsheets according to Comparative Examples 1 to 6 were used to perform a monitor evaluation of the surface feel and the discomfort. The evaluation result is shown in FIG. The respective materials of the center seat and the side seats that form the top seat are shown in FIG. The dynamic friction coefficient was measured by the above-mentioned measuring method. The surface characteristics were evaluated for each sample after applying the topsheet according to each sample to the absorbent article according to the above-mentioned embodiment and using 5 sheets for the monitor during the physiological period. Feeling of touch is evaluated on a 3-point scale (○, △, ×) when wearing the product, and discomfort is evaluated on a 3-grade scale of the degree of rubbing on the skin when walking 10 steps 2 hours after the wearing. , △, ×).

  As shown in FIG. 5, according to the evaluation results, since the coefficient of kinetic friction of the center seat is higher than the coefficient of kinetic friction of the side seats, there is no “x” in the evaluation of touch feeling and discomfort, and favorable results are obtained. I was able to do it. The difference between the dynamic friction coefficient of the center seat and the dynamic friction coefficient of the side seats is preferably 0.26 to 0.35.

Further, in the top sheet according to the present invention, the center sheet is configured to absorb more body fluid. The absorption performance of this body fluid can be evaluated by the color after the color reaction of ninhydrin. In the evaluation by the ninhydrin reaction, wet skin can be reproduced by wetting kanaquin. The skin moisture content to be reproduced should be 60% when wet. Therefore, the predetermined amount of artificial sweat is 60 wt /% with respect to the weight of kanakin. Kanakin is moistened with artificial sweat (Hayashi Junyaku Kogyo Co., Ltd .: artificial sweat (acidic) Product code: M9-17 Product code 44008785 or artificial sweat (alkali) Product code: M9-18 Product code: 44008775) Then, a 525-g weight, which is a rectangular parallelepiped with a bottom surface of 35 mm × 25 mm, is placed on it. Place the kanakin on the molded absorbent article and let stand for 5 minutes. It should be noted that the kanakin used has a width wider than that of the absorbent article by 10 mm or more. At this time, kanakin should be applied to the surface of each sample facing the wearer. A sample that reproduces wet skin is uniformly coated with a 0.3 wet% ninhydrin aqueous solution at 30 g / m ^2, and then naturally dried.

  The difference between the absorbed amount of artificial sweat by the center seat and the absorbed amount of artificial sweat by the side seats can be evaluated by the following two means. As a first means, evaluation is performed based on the L value. The absorbent article after the ninhydrin reaction is placed on the black sheet with the back sheet facing down. Next, the L * values of the top sheet side of the absorbent article on the measurement target area (center sheet area and side sheet area) are measured three times with a colorimeter and the average value is calculated. The L * value in the L * a * b * color system defined by the International Commission for Illumination (Commission Internationale de l'Eclairage) is, for example, a color difference meter (CR-3000 manufactured by KONICA MINOLTA). Can be used for measurement. Since the larger the L value, the better the whiteness of the surface after use, it can be evaluated that the smaller the L value is, the more sweat is absorbed.

  Comparing the L values of the center sheet having water-retaining fibers and the side sheet containing thermoplastic resin fibers, the L * value of the center sheet becomes larger than the L * value of the second sheet, and It was found to absorb sweat more than plastic resin fibers.

  In addition, as a second means, evaluation is performed based on a color sample of PANTONE (registered trademark). The center sheet and the side sheet of the absorbent article after the ninhydrin reaction are compared with the color sample of PANTONE (registered trademark), and the shades thereof are compared. A color sample closest to the color after the color reaction of the center sheet and a color sample closest to the color after the color reaction of the side sheet are extracted. It can be seen that due to the different color samples, the amount of body fluid absorbed by the center sheet is different from the amount of body fluid absorbed by the side sheet. Also, the greater the absorption of artificial sweat, the darker the color after the ninhydrin reaction. Therefore, by comparing the colors of the color sample close to the center sheet and the color sample close to the side sheet, it can be understood that the center sheet has a dark color sample and thus the center sheet absorbs a large amount of body fluid. Also, it can be seen that the larger the color difference between the color samples, the more different the absorption amount of the body fluid. When evaluated using the center sheet and the side sheet according to the present embodiment, the color sample of the center sheet was Pantone 513C and the color sample of the side sheet was Pantone 516C. It was found that the color swatch of the center sheet was dark and the center sheet absorbed a large amount of body fluid.

  Although the present invention has been described in detail above using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the claims. Therefore, the description of the present specification is for the purpose of exemplifying explanation, and does not have any restrictive meaning to the present invention.

  In the absorbent article according to the modified example, the side sheet 12 may be arranged closer to the skin surface side T1 than the center sheet 11. In the form in which the side sheet 12 is disposed on the skin surface side T1 with respect to the center sheet 11, the non-folded portions 12A of the side sheet 12 may be provided in a pair so as to be separated in the width direction. The folded-back portion 12B of the side sheet 12 may be arranged on the skin surface side of the absorbent core or may be arranged on the non-skin surface side of the absorbent core.

  It is possible to provide an absorbent article capable of improving fitability to an excretion opening and suppressing leakage while suppressing a decrease in touch feeling against a leg when worn.

1: Absorbent article 3: Wing 10: Top sheet 11: Center sheet 12: Side sheet 12A: Non-folded portion 12B: Folded portion 14: Joined portion 15: Standing portion 16: Sheet pressing portion 20: Non-skin side sheet 31 : Absorption core 33: High basis weight part 65: Front and rear compression part 111: First layer 112: First layer R11: Bonding region R12: Non-bonding region R31: First region R32: Second region RY: Center non-bonding region L : Front-rear direction T: Thickness direction T1: Skin surface side T2: Non-skin surface side W: Width direction

Claims (11)

Front-back direction and width direction orthogonal to each other,
Having a top sheet that is directed to the wearer's skin,
The top sheet is an absorbent article having a center sheet arranged at the center in the width direction of the absorbent article, and a side sheet arranged outside the center sheet in the width direction,
The side sheet has a non-folded portion and a folded portion that is folded back toward the non-skin surface side at an outer edge of the side sheet,
In the region extending from the outer edge of the side sheet to the inner side in the width direction, the folded-back portion has a standing portion that is not joined to the non-skin-side sheet located on the non-skin-face side of the folded-back portion. Is provided,
An absorbent article in which the dynamic friction coefficient of the center sheet when the top sheet is wet is higher than the dynamic friction coefficient of the side sheet when the top sheet is wet.   The absorbent article according to claim 1, wherein the non-folded portion of the side sheet is located closer to the skin surface side than the center sheet. The non-folded portion of the side sheet is located on the non-skin surface side of the center sheet,
The absorbent article according to claim 1, wherein a center non-bonding region in which an outer portion of the center sheet is not bonded to the side sheet is provided.   The absorbent article according to claim 3, wherein the length of the standing portion in the width direction is longer than the length of the center non-bonding region in the width direction. Extending to the outer side in the width direction than the top sheet, and having an extending sheet directed to the wearer's skin,
The absorbent article according to any one of claims 1 to 4, wherein a coefficient of dynamic friction of the extension sheet when wet is lower than a coefficient of dynamic friction of the top sheet when wet. The center sheet has a water retention fiber,
The absorbent article according to any one of claims 1 to 5, wherein the side sheet has a thermoplastic resin fiber. The center sheet has a first layer and a second layer located on the non-skin surface side of the first layer,
The water-retaining fiber is biased to the first layer side,
The thermoplastic resin fibers are biased to the second layer side,
The absorbent article according to claim 6, wherein the water-retaining fibers are cotton fibers. An absorbent core located on the non-skin surface side of the center sheet, and at least a compressed portion obtained by compressing the absorbent core and the center sheet in the thickness direction,
The absorbent core comprises pulp and superabsorbent polymer,
The compression unit has a pair of front and rear compression units extending in the front-rear direction and arranged at intervals in the width direction,
The grammage of the superabsorbent polymer in the first region located outside the front-to-back squeezed portion in the width direction is greater than the grammage of the superabsorbent polymer in the second region sandwiched by the front-to-back squeezed portion. The absorbent article according to any one of claims 1 to 7, which is high. Having an absorbent core located on the non-skin side of the center sheet,
The absorbent article according to any one of claims 1 to 8, wherein the at least a part of the standing portion is located outside the absorbent core in the width direction. An absorbent core located on the non-skin surface side of the center sheet, and at least a compressed portion obtained by compressing the absorbent core and the center sheet in the thickness direction,
The compression unit has a pair of front and rear compression units extending in the front-rear direction and arranged at intervals in the width direction,
The sheet compression part which compressed the said center sheet and the said side sheet in the thickness direction is formed outside the said front-back compression part in the said width direction, The sheet compression part of any one of Claim 1 to 9 characterized by the above-mentioned. Absorbent article. Having an absorbent core located on the non-skin side of the center sheet,
The absorbent material according to any one of claims 1 to 10, wherein the upright portion is located outside of the high basis weight portion having the highest basis weight of the absorbent material in the absorbent core in the width direction. Goods.

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