WO2022030211A1

WO2022030211A1 - Absorbent article

Info

Publication number: WO2022030211A1
Application number: PCT/JP2021/026576
Authority: WO
Inventors: 貴史白川; 拓也幸田; 美奈富田
Original assignee: 花王株式会社
Priority date: 2020-08-05
Filing date: 2021-07-15
Publication date: 2022-02-10
Also published as: JP2022029861A; CN116096336A

Abstract

This absorbent article (1) comprises fastening tape (7) and a fastening member (6) that can fasten the fastening tape (7). An outer layer sheet (5) that forms a non-skin facing surface in an abdominal section (A) of the absorbent article (1) has a flat fiber-containing region (R) in which flat fibers are present on at least the surface on the non-skin facing surface side. The fastening member (6) has: a first surface (61) in which the fastening tape (7) is fastened; and a second surface (62) on the opposite side to the first surface (61). The second surface (62) has a higher surface contact area ratio than the first surface (61) and the second surface (62) is adhered to the flat fiber-containing region (R).

Description

Absorbent article

The present invention relates to an absorbent article.

Absorbent articles comprising a fastening tape and a fastening member to which the fastening tape can be fastened are known. Such absorbent articles are fixed to the wearer's waist by arranging both ends in the vertical direction around the wearer's waist so as to face each other in the front-rear direction and fastening the fastening tape and the fastening member. It will be in a wearing state.
For example, Patent Document 1 includes fastener tapes provided on both sides of the back body and target tapes provided on the outer surface of the front body and made of a thermoplastic resin, and the target tape is made of a bulky non-woven fabric. A disposable diaper in which the target tape is heat-sealed in a predetermined pattern is described on a thermoplastic resin sheet constituting the outer surface of the diaper.

Further, it is known that a fastening tape is attached to a sheet forming an outer surface of an absorbent article.
For example, Patent Document 2 has a fastening tape partially or wholly formed of a male material of a hook-and-loop fastener, and a locking portion for locking the male material, and the hydrophobic sheet and the non-woven fabric are water-soluble hot. It is provided with a back surface sheet formed by thermal pressure bonding via an adhesive made of a melt resin, and the adhesive strength between the hydrophobic sheet and the non-woven fabric on the back surface sheet is at least a predetermined value, and the back surface sheet has predetermined physical characteristics. A deployable absorbent article having the above is described.

JP-A-2007-307210. Japanese Unexamined Patent Publication No. 2009-183977

The present invention has a vertical direction corresponding to the front-back direction of the wearer and a lateral direction orthogonal to the vertical direction, a crotch portion arranged in the crotch portion of the wearer, and an abdomen extending in the front-rear direction of the crotch portion. It has a side portion and a dorsal portion, and the fastening tape provided on both side edges of the dorsal portion along the vertical direction and the fastening tape provided on the non-skin facing surface of the ventral side portion. The present invention relates to an absorbent article provided with a fastening member that can be fastened.
The outer layer sheet forming the non-skin facing surface on the ventral side preferably has a flat fiber-containing region in which flat fibers are present on at least the surface on the non-skin facing surface side.
The fastening member has a first surface to which the fastening tape is fastened and a second surface opposite to the first surface, and the second surface has a surface contact area larger than that of the first surface. It is preferable that the rate is high and the second surface is adhered to the flat fiber-containing region.

FIG. 1 is a perspective view showing a deployable disposable diaper according to an embodiment of the absorbent article of the present invention. FIG. 2 is a development plan view schematically showing the skin facing surface side (inner surface side) of the diaper shown in FIG. 1 in the expanded and extended state. FIG. 3 is a sectional view taken along line II-II of FIG. FIG. 4 is an enlarged plan view in which the fastening member shown in FIG. 1 is partially peeled off.

Detailed description of the invention

The fastening member for fastening the fastening tape is generally provided on the outer surface of the absorbent article by using an adhesive. In order to stably maintain the wearing condition of the absorbent article provided with the fastening tape and the fastening member, the engaging force between the fastening tape and the fastening member must be high, and the fastening member must be firmly attached to the outer surface of the absorbent article. It is desirable that it is fixed. However, if the amount of the adhesive used is too large from the viewpoint of fixing the fastening member, the production cost increases, the texture of the outer surface of the absorbent article decreases, and the odor of the adhesive becomes strong. There was a risk of quality deterioration such as. The absorbent article described in Patent Document 1 fixes the target tape by heat fusion instead of the adhesive, but both the fixing of the fastening member on the outer surface of the absorbent article and the texture of the absorbent article are compatible. There were not enough points to make it. Patent Document 2 does not disclose a technique for fixing a fastening member to the outer surface of an absorbent article.

The present invention relates to an absorbent article in which the fastening member can be stably fixed to the outer surface of the absorbent article and the texture is also taken into consideration.

Hereinafter, the absorbent article of the present invention will be described based on its preferred embodiment. 1 to 4 show a deployable disposable diaper (hereinafter, also simply referred to as "diaper") which is an embodiment of the absorbent article of the present invention.
The diaper 1 shown in FIG. 2 corresponds to the front-back direction of the wearer in the deployed and extended state, and is orthogonal to the vertical direction X extending from the ventral side of the wearer to the dorsal side through the crotch portion and the vertical direction X. It has a lateral direction Y to be used. The diaper 1 has a ventral portion A arranged on the ventral side of the wearer, a dorsal portion B arranged on the dorsal side, and a crotch portion C arranged on the crotch portion when the diaper 1 is worn. That is, the ventral portion A and the dorsal portion B extend in front of and behind the inseam C. The ventral portion A, the inseam C, and the dorsal portion B are regions in which the diaper 1 is divided into three equal parts in the total length in the vertical direction X, and extends continuously in the front-back direction of the wearer. .. The inseam C has an excretion portion facing portion (not shown) that is arranged to face the excretion portion of the wearer when the diaper 1 is worn.

In the present specification, the "expanded and stretched state" of the diaper 1 means that the diaper 1 is in the unfolded state, and the elastic member of each part of the unfolded diaper 1 is stretched to eliminate the influence of the elastic member. It means the state of being expanded until it becomes the same as the dimensions when it is expanded in a flat state.
Further, the "skin facing surface" is a surface facing the wearer's skin when wearing the diaper when focusing on the diaper or its constituent members (for example, an absorber), and the "non-skin facing surface" is the diaper. This is the surface that faces the wearer's skin when worn. That is, the skin-facing surface is the surface relatively close to the wearer's skin, and the non-skin-facing surface is the surface relatively far from the wearer's skin. "When worn" and "wearing state" refer to a state in which the proper wearing position of the diaper is maintained and worn.

As shown in FIG. 3, the diaper 1 includes a liquid-permeable surface sheet 2 that forms a skin-facing surface, and a liquid-impermeable (including water-repellent) leak-proof sheet 3 that forms a non-skin-facing surface. A liquid-retaining absorber 4 arranged between the surface sheet 2 and the leak-proof sheet 3 is provided, and these members constitute the absorbent main body 10. In FIG. 3, for convenience of explanation, the leak-proof cuff 16 described later is shown in an upright state.
The surface sheet 2 and the leak-proof sheet 3 each have a larger size than the absorber 4, and extend outward from the outer peripheral edge of the absorber 4. Each longitudinal end edge of the leak-proof sheet 3 in the present embodiment substantially coincides with the longitudinal end edge of the diaper 1.

The diaper 1 includes a liquid-retaining absorber 4. The absorber 4 shown in FIG. 2 is arranged so that its longitudinal direction coincides with the vertical direction X of the diaper, and extends from the ventral side A to the dorsal side B via the inseam C. The longitudinally bilateral edges of the absorber 4 are located inward of the longitudinal X bilateral edges of the diaper 1.
As shown in FIG. 3, the absorber 4 is formed by coating an absorbent core 4a having an absorbent performance on a liquid-permeable core wrap sheet 4b.

The diaper 1 includes a pair of leakage-

proof cuffs

16 and 16 arranged along both sides of the absorbent body 10 along the vertical direction X.
The leak-proof cuff 16 includes a thread-shaped elastic member for forming a cuff 16a and a water-repellent and breathable sheet for forming a cuff 16b. The leak-proof cuff 16 stands up toward the wearer's skin side at least in the inseam C due to the contraction of the elastic member 16a for forming the cuff, whereby excrement such as urine flows out in the lateral direction Y. Suppress that.

As shown in FIGS. 1 and 2, the diaper 1 is provided with a pair of

fastening tapes

7 and 7 on both side edges of the dorsal portion B along the vertical direction X. Each fastening tape 7 is provided so as to extend outward in the lateral direction Y from both side edges of the dorsal portion B along the vertical direction X. One end of each fastening tape 7 on the inner side in the lateral direction is fixed to a sheet member constituting the diaper 1, preferably between the sheet members constituting the diaper 1, for example, a leak-proof sheet 3 and an outer layer. It is fixed between the sheet 5 and the sheet (not shown).
The fastening tape 7 of the present embodiment has a tape base material 70 and an engaging portion 71 fixed to the skin facing surface of the tape base material 70. The engaging portion 71 has an engaging projection on the surface facing the skin. As the engaging portion 71, a male material of a mechanical fastener can be used. The mechanical fastener is composed of a male material in which a large number of engaging protrusions are arranged on the surface and a female material in which a material capable of directly engaging the engaging protrusions is arranged on the surface. A fastener that is made to engage with each other by making surface contact with each other. As the mechanical fastener, various known ones can be used without particular limitation.

The diaper 1 is provided with a fastening member 6 to which the engaging portion 71 included in the fastening tape 7 can be detachably fastened to the non-skin facing surface of the ventral side portion A. The fastening member 6 is configured to include the female material of the mechanical fastener described above. The material forming the portion of the fastening member 6 to which the engaging portion 71 is fastened, that is, the material of the female material can be selected according to the shape of the engaging protrusion of the engaging portion 71. As the material of the female material, for example, a loop portion, a mesh portion, or the like, or a non-woven fabric having a high degree of engagement can be used.
The fastening member 6 is provided on the outer layer sheet 5 forming the non-skin facing surface in the ventral side A of the diaper 1.

As shown in FIG. 3, the diaper 1 of the present embodiment includes an outer layer sheet 5 arranged on the non-skin facing surface side of the absorbent main body 10, that is, on the non-skin facing surface side of the leak-proof sheet 3. The outer layer sheet 5 forms the outer surface (non-skin facing surface) of the diaper 1. The outer layer sheet 5 of the present embodiment extends from the ventral side A to the dorsal side B via the crotch portion C in the vertical direction X. The outer layer sheet 5 forms the outer shape of the diaper 1 in the expanded and extended state, and the peripheral edge of the outer layer sheet 5 forms the contour lines of the ventral side portion A, the inseam portion C, and the dorsal side portion B, respectively. There is.
As shown in FIG. 2, the contour of the diaper 1 of the present embodiment constricts the central side of the vertical direction X, that is, the inseam C and the parts of the ventral side A and the dorsal side B on the crotch C side. The end side of the vertical direction X in each of the ventral side portion A and the dorsal side portion B projects laterally Y outward from the portion on the crotch portion C side.

The outer layer sheet 5 extends outward in the lateral direction Y from both side edges along the vertical direction X of the absorber 4, and has a side flap portion together with the leak-proof sheet 3 and the cuff forming sheet 16b constituting the leak-proof cuff 16. Forming SF. The side flap portion SF is a portion made of a sheet member extending outward in the horizontal direction Y from both side edges of the absorber 4 along the vertical direction X. The seat member constituting the side flap portion SF extends from the ventral side portion A to the dorsal side portion B via the crotch portion C, and extends laterally Y outward from each of both side edges of the absorber 4. In the extending portion, they are joined to each other by known joining means such as an adhesive, a heat seal, and an ultrasonic seal.

In the diaper 1 of the present embodiment, as shown in FIG. 2, the elastic members 15 for forming leg gathers are provided on both side portions of the diaper 1 along the vertical direction X, specifically, the pair of side flap portions SF and SF. Is arranged in an extended state so as to extend in the vertical direction X through the lower crotch C. Due to the contraction of the elastic member 15, leg gathers are formed on the left and right portions arranged around the wearer's legs, that is, on both sides of the diaper 1 in the vertical direction X. In the present embodiment, the leg gather forming elastic member 15 is fixed in an extended state along the vertical direction X between the cuff forming sheet 16b and the leakage-proof sheet 3 in the side flap portion SF.

The outer layer sheet 5 has a flat fiber-containing region R in which flat fibers are present, at least on the surface of the ventral side A on the non-skin facing surface side. A fastening member 6 is provided in the flat fiber-containing region R on the ventral side A. The fastening member 6 is adhered to the flat fiber-containing region R. In the outer layer sheet 5 of the present embodiment, the portion of the ventral side A to which the fastening member 6 is adhered is at least the flat fiber-containing region R, and the area of the flat fiber-containing region R is the area of the fastening member 6. The entire fastening member 6 overlaps the flat fiber-containing region R.

The flat fiber is a fiber having a flatness (major axis length / minor axis length) of 1.2 or more in the cross section of the fiber. For example, when the cross section of the fiber has a perfect circular shape, the flatness is 1, and as the degree of crushing of the cross section increases (closer to an elliptical shape), the flatness becomes larger than 1.
From the viewpoint of improving the adhesiveness of the fastening member 6, the abundance of the flat fibers in the flat fiber-containing region R is preferably 60% or more, more preferably 70% or more. The upper limit of the abundance rate of the flat fibers in the flat fiber-containing region R is not particularly limited and may be 100%. The abundance of such flat fibers is measured by the following measuring method.

[Method for measuring the abundance of flat fibers in the flat fiber-containing region R]
The outer layer sheet 5 on the ventral side A is taken out from the diaper 1, and the fastening member 6 is peeled off from the outer layer sheet 5. On the non-skin facing surface of the outer layer sheet 5, the measurement piece is cut out from the region where the fastening member 6 is adhered. The measuring piece has a quadrangular shape (8 mm × 4 mm) in a plan view, and can be obtained by cutting the outer layer sheet 5 with a razor (for example, a single blade manufactured by Feather Safety Shaving Blade Co., Ltd.). When cutting the outer layer sheet 5, care should be taken so that the structure of the cut surface of the measuring piece formed by the cutting is not destroyed by the pressure at the time of cutting or the like. As a preferable cutting method, there is a method of putting the outer layer sheet 5 in liquid nitrogen to sufficiently freeze the outer layer sheet 5 prior to cutting the outer layer sheet 5, and then cutting the outer layer sheet 5. Using double-sided paper tape (Nichiban Co., Ltd. Nystack NW-15), attach the measurement piece to the sample table. The measurement piece is then platinum coated. For coating, an ion sputtering device E-1030 (trade name) manufactured by Hitachi Naka Seiki Co., Ltd. is used, and the sputtering time is 30 seconds. Next, the cut surface of the measurement piece is observed at a magnification of 1000 times using an S-4000 type field emission scanning electron microscope manufactured by Hitachi, Ltd. In this cut surface, observe the cross section of the fiber existing on the non-skin facing surface of the measurement piece, measure the major axis length and the minor axis length of the cross section of the fiber, and divide the major axis length by the minor axis length. Calculate the flatness of the fiber with. This is measured for 10 fibers, and the ratio of the number of fibers having a flatness (major axis length / minor axis length) of 1.2 or more to the 10 fibers is determined, and this is the abundance rate (%) of flat fibers. And.

When a constituent member such as an outer layer sheet 5 or a fastening member 6 is taken out from the diaper 1 and the physical properties of the constituent member are measured, if the constituent member is fixed to another constituent member by an adhesive, the fixing portion thereof. After the other components are peeled off by blowing cold air from a cold spray, the adhesive adhering to the components to be measured is removed by dissolving with an organic solvent. This operation is common to all measurements herein.

As a method for obtaining flat fibers, that is, fibers having a large degree of crushing of the cross section, 1) a method of spinning using a spinneret having a flatness corresponding to a desired flatness, and 2) a normal spinneret (with a cross section of a spinneret). Examples thereof include known methods such as a method of performing post-processing such as pressurization on a fiber deposit obtained by using a perfect circular shape or a shape similar thereto. The flatness of the spinneret in the method 1) may be the same as the flatness of the target fiber, or may be higher than the flatness of the target fiber.
The method 2) is preferable from the viewpoint of surely aligning the long axis direction of the flat fiber with the plane direction of the nonwoven fabric to further improve the adhesiveness of the fastening member 6. The method 2) can be carried out, for example, by pressurizing and consolidating a fiber aggregate (nonwoven fabric) containing fibers having a perfect circular cross section while heating as necessary. Such a method can be carried out, for example, by calendar processing.

The outer layer sheet 5 may have a flat fiber-containing region R at least on the ventral side A. The outer layer sheet 5 of the present embodiment partially has a flat fiber-containing region R on the ventral side A. Instead of this, the outer layer sheet 5 may have a flat fiber-containing region R in the entire area of the ventral side A, or the entire area of the outer layer sheet 5 may have a flat fiber-containing region R.

As shown in FIG. 4, the fastening member 6 has a first surface 61 to which the fastening tape 7 is fastened, and a second surface 62 opposite to the first surface 61. The first surface 61 is a surface that engages with the engaging protrusion in the engaging portion 71 of the fastening tape 7, and is provided with an engaged portion (female material) such as a loop portion that engages with the engaging protrusion. There is. The second surface 62 is adhered to the flat fiber-containing region R via an adhesive.

The surface contact area ratio of the first surface 61 and the second surface 62 of the fastening member 6 is different. Specifically, the second surface 62 has a higher surface contact area ratio than the first surface 61. The surface contact area ratio is an index showing the degree of unevenness on the surface. The surface contact area ratio is measured by the method described later.

In the diaper 1 of the present embodiment, as shown in FIG. 1, the fastening tape 7 is fastened to the fastening member 6, so that the waist opening WH through which the wearer's torso is passed and the wearer's lower limbs are formed. A pair of leg openings LH to be passed is formed and worn by the wearer. In the present embodiment, since the fastening member 6 is adhered to the flat fiber-containing region R of the outer layer sheet 5, the adhesiveness between the fastening member 6 and the outer layer sheet 5 is excellent. This is because the flat fibers are present in the portion where the fastening member 6 is adhered, and the second surface 62 having a surface contact area ratio larger than that of the first surface 61 is an adhesive surface with the outer layer sheet 5. This is because a large contact area between the outer layer sheet 5 and the fastening member 6 can be secured. Further, in the fastening member 6, the first surface 61, which is the surface having the lower surface contact area ratio, is located on the surface of the diaper 1 opposite to the skin facing surface side, so that the adhesiveness with the outer layer sheet 5 is improved. While improving, the engaging force between the engaging portion 71 and the fastening member 6 in the fastening tape 7 can be easily secured.
According to the diaper 1 of the present embodiment, the bonding strength between the fastening member 6 and the outer layer sheet 5 can be improved without increasing the amount of the adhesive used, or the fastening member 6 and the outer layer sheet 5 can be attached to each other. It is also possible to reduce the amount of adhesive used while maintaining the bond strength at the same level as before.
According to the diaper 1 of the present embodiment, the adhesiveness between the outer layer sheet 5 and the fastening member 6 can be ensured without using a large amount of adhesive, so that the texture of the outer surface of the diaper 1 is maintained well. At the same time, it is possible to suppress the generation of odor due to a large amount of adhesive.

[Measurement method of surface contact area ratio]
A measuring piece having a size of 60 mm in the vertical direction × 30 mm in the horizontal direction is cut out from the fastening member 6. This measuring piece is placed on a horizontal table under no pressure so that the surface to be measured (first surface 61 or second surface 62) faces up. A transparent acrylic plate is placed on the measuring piece, and a weight is placed on the acrylic plate so that the measuring piece is pressurized at 1.7 kPa. Next, the surface shape of the surface to be measured in the pressurized measuring piece is measured using a high-precision shape measuring system KS-1100 manufactured by Keyence. Specifically, the thickness of each position on the measuring piece is measured. The measurement conditions are a measurement pitch of 50 μm and a moving speed of 10 cm / s, and a range of 30 mm in the vertical direction × 30 mm in the horizontal direction is measured. The measurement result (image) thus obtained is analyzed using a shape analysis application KS-Analyzer manufactured by Keyence Corporation. Then, the position where the maximum thickness is obtained in the measurement piece and the position where the thickness difference from the maximum thickness is 200 μm or less are extracted, and this is referred to as a “high thickness region”. Further, the position where the thickness difference from the maximum thickness of the measurement piece exceeds 200 μm is defined as a “low thickness region”. The area of the high-thickness region is measured by binarizing the high-thickness region and the low-thickness region. Specifically, the image is taken into Image-Pro Plus manufactured by Nippon Roper Co., Ltd., and the black-and-white contrast is set to 100 by enhancing the contrast. After removing noise by a filter process (median, 5 × 5 5 times), a count process is performed to measure the total area of the high-thickness region displayed in white or black. Then, the total area of the high-thickness region is divided by the area of the measuring piece (30 mm in the vertical direction × 30 mm in the horizontal direction), and this is taken as the surface contact area ratio.
When measuring the surface contact area ratio of the flat fiber-containing region R in the outer layer sheet 5, the portion where the fastening member 6 is peeled off is cut out and used as a measurement piece.

From the viewpoint of further achieving both the adhesiveness between the outer layer sheet 5 and the fastening member 6 and the texture of the outer surface of the diaper 1, the surface contact area ratio of the flat fiber-containing region R in the outer layer sheet 5 is set to S1 and the first in the fastening member 6. When the surface contact area ratio of the two surfaces 62 is S2, the ratio of S2 to S1 (S2 / S1) is preferably 0.7 or more, more preferably 0.8 or more, and preferably 1.4 or less. It is more preferably 1.3 or less, preferably 0.7 or more and 1.4 or less, and more preferably 0.8 or more and 1.3 or less.

From the viewpoint of further achieving both the engaging force between the fastening tape 7 and the fastening member 6 and the adhesiveness between the outer layer sheet 5 and the fastening member 6, the surface contact area ratio of the first surface 61 of the fastening member 6 is set to S3. When the surface contact area ratio of the second surface 62 of the fastening member 6 is S2, the ratio of S2 to S3 (S2 / S3) is preferably 1.4 or more, more preferably 1.5 or more, and more preferably. Is 10 or less, more preferably 9 or less, preferably 1.4 or more and 10 or less, and more preferably 1.5 or more and 9 or less.

From the viewpoint of further improving the adhesiveness between the outer layer sheet 5 and the fastening member 6, the surface contact area ratios of the flat fiber-containing region R of the outer layer sheet 5 and the second surface 62 of the fastening member 6 are within the following ranges. Is preferable.
In the outer layer sheet 5, the surface contact area ratio of the flat fiber-containing region R is preferably 70% or more, more preferably 80% or more, preferably 100% or less, more preferably 95% or less, and more preferably. It is 70% or more and 100% or less, more preferably 80% or more and 95% or less. The surface contact area ratio in the outer layer sheet 5 may be controlled, for example, by forming an opening in the sheet. Further, by performing the pressure opening treatment on the sheet, the flat fiber-containing region R can be formed in addition to the opening portion.
The surface contact area ratio of the second surface 62 of the fastening member 6 is preferably 70% or more, more preferably 80% or more. The upper limit of the surface contact area ratio of the second surface 62 is not particularly limited, and the closer it is to 100%, the more preferable.

From the viewpoint of further improving the engaging force between the fastening tape 7 and the fastening member 6, the surface contact area ratio of the first surface 61 of the fastening member 6 is preferably 10% or more, more preferably 20% or more. Further, it is preferably 50% or less, more preferably 40% or less, preferably 10% or more and 50% or less, and more preferably 20% or more and 40% or less.

From the viewpoint of further improving the adhesiveness between the outer layer sheet 5 and the fastening member 6, the average friction coefficient MIU of each of the flat fiber-containing region R and the second surface 62 is preferably 0.2 or less, more preferably 0.19. It is as follows. The lower limit of the average friction coefficient MIU of each of the flat fiber-containing region R and the second surface 62 is not particularly limited, and the closer it is to 0, the more preferable.

From the same viewpoint as above, the average deviation MMD of the friction coefficient of each of the flat fiber-containing region R and the second surface 62 is preferably 0.008 or less, more preferably 0.007 or less. There is no particular limitation on the lower limit of the MMD of the friction coefficient for each of the flat fiber-containing region R and the second surface 62, and the closer it is to 0, the more preferable.

[Measurement method of average friction coefficient MIU and average deviation MMD of friction coefficient]
Using a KES-FB4 surface tester (manufactured by Kato Tech Co., Ltd.), the contact was placed at 0.1 cm / sec under a load of 5 kPa (50 gf / cm ² ) with a contact on the measurement target. Move 3 cm horizontally at a constant speed. The average deviations of the friction coefficient and the friction coefficient in the region where the contact is moved are measured at three points separated in the lateral direction Y, and the average values are taken as the average friction coefficient MIU of the sheet and the average deviation MMD of the friction coefficient. do.
When the measurement target is the flat fiber-containing region R of the outer layer sheet 5, the portion where the fastening member 6 is peeled off is defined as the flat fiber-containing region R, and the average friction coefficient MIU and the average deviation MMD of the friction coefficient are measured.

The outer layer sheet 5 and the fastening member 6 are adhered to each other via an adhesive. As the adhesive, a known adhesive such as a hot melt adhesive can be used.
Amount of adhesive used to bond the outer layer sheet 5 and the fastening member 6 from the viewpoint of further improving the texture of the diaper 1 on the non-skin facing surface while ensuring the bonding strength between the outer layer sheet 5 and the fastening member 6. Is 10 g / m ² or more, more preferably 15 g / m ² or more, preferably 30 g / m ² or less, more preferably 25 g / m ² or less, and preferably 10 g / m ² or more and 30 g / m. It is ² or less, more preferably 15 g / m ² and 25 g / m ² or less.

From the viewpoint of ensuring the adhesiveness between the outer layer sheet 5 and the fastening member 6 even under high humidity conditions, it is preferable that the flat fiber-containing region R or the second surface 62 is coated with an adhesiveness improving agent. That is, it is preferable that the adhesiveness improving agent is applied to the adhesive portions of the outer layer sheet 5 and the fastening member 6. The adhesiveness improving agent improves the adhesiveness of the adhesive. When the member coated with such an adhesiveness improving agent is adhered with an adhesive, it can be adhered more firmly than the one adhered with the adhesive alone. As the adhesiveness improving agent, one made of a hydrophobic substance can be used. The adhesiveness improver preferably contains an oily component as a component. Examples of the oily component include vegetable oils, silicone compounds, C ₁₂ to C ₂₂ fatty acids or glycerol ester compounds thereof, C ₁₂ to C ₄₄ fatty acid ethers, C ₁₂ to C ₂₂ fatty alcohols, petrolatum and the like.
Among these, it is preferable to contain vegetable oil. Examples of vegetable oils include olive oil, jojoba oil, rice oil, shea butter, tea oil, aloe oil, argan oil, and peach oil.
As the adhesiveness improver, one or more of the above oily components can be used in combination, and as the adhesiveness improver, a composition containing the above one or more of the above oily components can be used. As the adhesiveness improving agent, a skin care agent containing shea butter, argan oil or peach oil, a skin care agent containing stearyl alcohol and the like can be preferably used.
When the adhesiveness improving agent is applied to the flat fiber-containing region R, it may be applied to the portion to which the fastening member 6 of the flat fiber-containing region R is adhered. The adhesiveness improving agent may be applied to either one of the flat fiber-containing region R and the second surface 62, or may be applied to both the flat fiber-containing region R and the second surface 62.

From the viewpoint of increasing the surface contact area ratio of the second surface 62 more easily than the first surface 61, the second surface 62 of the fastening member 6 is subjected to a void closing treatment for closing the voids between the fibers. Is preferable. As the void closing treatment, a method of closing the voids between the fibers forming the second surface 62 can be used without particular limitation. Examples of such treatment include heat treatment, ultrasonic treatment, ink coating treatment and the like.

The material for forming each part of the diaper in the above-described embodiment will be described in detail. As the surface sheet 2, the leak-proof sheet 3 and the absorber 4, those conventionally used for absorbent articles can be used without particular limitation.
As the surface sheet 2, for example, a liquid-permeable non-woven fabric, a perforated film, or the like can be used.
As the leak-proof sheet 3, a liquid-impermeable resin film, a laminate of the resin film and a non-woven fabric, or the like can be used.
As the absorbent core 4, as the absorbent core 4a, an aggregate of hydrophilic fibers such as wood pulp and a hydrophilized synthetic fiber, or an aggregate in which a water-absorbing polymer is retained can be used. Further, as the core wrap sheet 4b, the same one as the surface sheet 2 can be used.

For the outer layer sheet 5 and the cuff forming sheet 16b, for example, non-woven fabrics produced by various manufacturing methods can be used. be able to. The outer layer sheet may be composed of one sheet, or may be composed of a laminated body of a plurality of sheets instead. Further, as the cuff forming sheet 16b, a water-repellent nonwoven fabric may be used.
As the elastic member 16a for forming the cuff and the elastic member 15 for forming the leg gather in the leak-proof cuff 16, various known elastic materials usually used for this kind of absorbent article can be used without particular limitation. Examples of the elastic material include synthetic rubber such as styrene-butadiene, butadiene, isoprene and neoprene, natural rubber, EVA, elastic polyolefin and polyurethane. As the form of the elastic member, a thread-like (thread rubber, etc.) or string-like (flat rubber, etc.) having a rectangular, square, circular, or polygonal cross section, or a multifilament type thread-like member is preferably used. can.

The tape base material 70 and the engaging portion 71 forming the fastening tape 7, and the forming materials of the fastening member 6 can be used without particular limitation as long as they are usually used for a deployable disposable diaper. Further, the shape of the engaging protrusion in the engaging portion 71 is not particularly limited, and may be a hook shape, an anchor shape, a hook shape, or the like.
For example, for the fastening tape 7 and the fastening member 6, "Magic Tape (registered trademark)" (manufactured by Kuraray), "Quicklon (registered trademark)" (manufactured by YKK), and "Majicross (registered trademark)" (Kanebo) Mechanical fasteners such as those manufactured by Belltouch) can be used. When a non-woven fabric is used for the fastening member 6, it is preferably an air-through non-woven fabric from the viewpoint of facilitating engagement.
As the material for forming the tape base material 70, a synthetic resin such as polyethylene, polypropylene, polyethylene terephthalate, etc., and a sheet or non-woven fabric made of a composite material of two or more kinds of these synthetic resins can be used.

From the viewpoint of making the surface contact area ratios of the first surface 61 and the second surface 62 different more easily, the fastening member 6 is formed by laminating a layer forming the first surface 61 and a layer forming the second surface 62. It is preferable to have a laminated structure of two or more layers. Examples of the fastening member 6 having such a form include a laminating female material of a mechanical fastener and a non-woven fabric, for example, a laminating non-woven fabric to which an engaging protrusion can be directly engaged and another non-woven fabric.
When the fastening member 6 has the laminated structure, the basis weight of the layer forming the second surface 62 is set from the viewpoint of easily increasing the surface contact area ratio of the second surface 62 as compared with the first surface 61. It is preferably 5 g / m ² or more, more preferably 10 g / m ² or more, preferably 35 g / m ² or less, more preferably 30 g / m ² or less, and preferably 5 g / m ² or more and 35 g / m. It is ² or less, more preferably 10 g / m ² and 30 g / m ² or less.

As shown in FIG. 2, the fact that the fastening member 6 does not overlap with the leg gather forming elastic member 15 in a plan view is a viewpoint of adhesiveness between the outer layer sheet 5 and the fastening member 6 when the diaper 1 is worn. Is preferable. In particular, in the vertical direction X, it is preferable that the leg gather forming elastic member 15 and the fastening member 6 are separated from each other in the expanded and extended state of the diaper 1. As a result, even if the amount of the adhesive is reduced, the adhesiveness between the outer layer sheet 5 and the fastening member 6 can be maintained more stably even when worn.
From the viewpoint that the above effect is more reliably achieved, the separation distance between the leg gather forming elastic member 15 and the fastening member 6 in the vertical direction X is preferably 10 mm or more, more preferably 15 mm or more. The separation distance is the distance in the expanded and extended state of the diaper 1, and is the end portion of the elastic member 15 for forming leg gathers in the ventral side A in the vertical direction X and the crotch lower portion C side of the fastening member 6. The distance along the vertical direction X between the ends.

From the viewpoint of further improving the adhesiveness between the outer layer sheet 5 and the fastening member 6 when the diaper 1 is worn, the fastening member 6 is heavy with the expansion / contraction region of the leakage-proof cuff 16 in a plan view, as shown in FIG. It is preferable not to be. The expansion / contraction region of the leakage-proof cuff 16 is a region that can be expanded / contracted in the vertical direction X by the elastic member 16a for forming the cuff. An example of a form in which the fastening member 6 does not overlap with the expansion / contraction region includes a form in which the fastening member 6 does not overlap the leakage-proof cuff 16 itself in a plan view, and the fastening member 6 is a cuff in a plan view. Examples thereof include a form in which the elastic member 16a for forming does not overlap with the stretchable portion. For example, the fastening member 6 may be overlapped only with the non-stretchable portion of the cuff forming elastic member 16a, or may be overlapped only with the non-stretchable portion of the leak-proof cuff 16. Can be mentioned. The "non-stretchable portion of the cuff-forming elastic member 16a" is, for example, a portion in which the elastic member 16a is arranged on the cuff-forming sheet 16b in a non-extended state. The “non-stretchable portion of the leak-proof cuff 16” is, for example, a portion where the cuff forming sheet 16b is fixed to another component of the diaper 1 and becomes non-stretchable.

The leak-proof cuff 16 has a base end portion that becomes an upright end when standing up toward the wearer's skin, and a free end portion. The leak-proof cuff 16 has a bent portion extending in the vertical direction X between the base end portion and the free end portion, and the space between the bent portion and the free end portion projects laterally Y outward. Is preferable. More specifically, the leak-proof cuff 16 has a first upright portion located between the base end and the bent portion, and a second upright portion located between the bent portion and the free end portion. It is preferable that the second standing portion extends outward in the lateral direction Y. With such a configuration, the central region of the outer layer sheet 5 (the region between the pair of leakage-proof cuffs 16 and 16) tends to be flattened, and the adhesiveness between the fastening member 6 and the outer layer sheet 5 can be further stabilized. can. In particular, on the central side of the fastening member 6 in the lateral direction Y, the influence of wrinkles due to the expansion and contraction of the leakage-proof cuff 16 on the first surface 61 is reduced, so that the fastening tape 7 and the first surface 61 of the fastening member 6 are combined. The fastening is more reliable. Such an effect is effective for a small size diaper 1 for infants and the like. Further, by having the second standing portion, the contact surface between the wearer's skin and the leakage-proof cuff 16 becomes large, so that the performance of suppressing lateral leakage of excrement can be improved.
Further, when the second standing portion of the leak-proof cuff 16 includes a plurality of elastic members 16a for forming a cuff, the elastic member 16a for forming the cuff and the fastening member 6 are separated from each other in the thickness direction of the diaper 1, so that the fastening member 6 is separated. It is preferable in that wrinkles are less likely to occur due to expansion and contraction of the elastic member.

Although the present invention has been described above based on the preferred embodiment thereof, the present invention is not limited to the above-described embodiment.
Further, the above-mentioned absorbent article was a so-called deployable disposable diaper having a fastening tape, but can be applied to, for example, a diaper cover (pad holder) or a band-shaped body that can be attached and detached around the waist, and is intended for infants. It may be for adults. The absorbent article of the present invention broadly includes articles used for absorbing body fluids (urine, loose stool, menstrual blood, sweat, etc.) discharged from the human body. For example, incontinence pads, sanitary napkins, sanitary shorts and the like are included.

The following absorbent articles are further disclosed with respect to the above-described embodiment of the present invention.
<1>
It has a vertical direction corresponding to the front-back direction of the wearer and a lateral direction orthogonal to the vertical direction, and is arranged in the crotch part of the wearer, and the ventral side and the back extending in the front-back direction of the crotch part. It has a side portion, and is provided on both side edges of the dorsal portion along the longitudinal direction, and is provided on a non-skin facing surface of the ventral side portion, and the fastening tape can be fastened. An absorbent article with a fastening member,
The outer layer sheet forming the non-skin facing surface on the ventral side has a flat fiber-containing region in which flat fibers are present on at least the surface on the non-skin facing surface side.
The fastening member has a first surface to which the fastening tape is fastened and a second surface opposite to the first surface, and the second surface has a surface contact area larger than that of the first surface. An absorbent article having a high rate and having the second surface adhered to the flat fiber-containing area.

<2>
The absorbent article according to <1>, wherein the presence rate of the flat fibers in the flat fiber-containing region is 60% or more, preferably 70% or more.
<3>
When the surface contact area ratio of the flat fiber-containing region in the outer layer sheet is S1 and the surface contact area ratio of the second surface of the fastening member is S2, the ratio of S2 to S1 (S2 / S1) is. The absorbent article according to <1> or <2>, which is 0.7 or more and 1.4 or less, preferably 0.8 or more and 1.3 or less.
<4>
When the surface contact area ratio of the first surface of the fastening member is S3 and the surface contact area ratio of the second surface of the fastening member is S2, the ratio of S2 to S3 (S2 / S3) is 1. The absorbent article according to any one of <1> to <3>, which is 4 or more and 10 or less, preferably 1.5 or more and 9 or less.
<5>
The absorbent article according to any one of <1> to <4>, wherein the outer layer sheet has a surface contact area ratio of 70% or more in the flat fiber-containing region.
<6>
The absorption according to any one of <1> to <5>, wherein the outer layer sheet has a surface contact area ratio of 70% or more and 100% or less, preferably 80% or more and 95% or less in the flat fiber-containing region. Sex goods.
<7>
The absorbent article according to any one of <1> to <6>, wherein the fastening member has a surface contact area ratio of 70% or more on the second surface.
<8>
The absorbent article according to any one of <1> to <7>, wherein the fastening member has a surface contact area ratio of 80% or more and 100% or less on the second surface.
<9>
The absorbent article according to any one of <1> to <8>, wherein the fastening member has a surface contact area ratio of 50% or less on the first surface.
<10>
The absorption according to any one of <1> to <9>, wherein the fastening member has a surface contact area ratio of 10% or more and 50% or less, preferably 20% or more and 40% or less on the first surface. Sex goods.

<11>
The absorbent article according to any one of <1> to <10>, wherein the flat fiber-containing region and the second surface each have an average friction coefficient of 0.2 or less.
<12>
The absorbent article according to any one of <1> to <11>, wherein the flat fiber-containing region and the second surface each have an average deviation MMD of friction coefficient of 0.008 or less.
<13>
The absorbent article according to any one of <1> to <12>, wherein the flat fiber-containing region or the second surface is coated with an adhesiveness improving agent.
<14>
The amount of the adhesive used to bond the outer layer sheet and the fastening member is 10 g / m ² or more and 30 g / m ² or less, preferably 15 g / m ² above 25 g / m ² or less. The absorbent article according to any one of <13>.
<15>
The absorption according to any one of <1> to <14>, wherein the fastening member has a laminated structure in which a layer forming the first surface and a layer forming the second surface are laminated. Sex goods.
<16>
The absorbent article according to <15>, wherein the basis weight of the layer forming the second surface is 5 g / m ² or more and 35 g / m ² or less, preferably 10 g / m ² above 30 g / m ² or less.
<17>
Elastic members for forming leg gathers are arranged in an extended state so as to extend in the vertical direction on each of both side portions of the absorbent article along the vertical direction.
The absorbent article according to any one of <1> to <16>, wherein the fastening member does not overlap with the leg gather forming elastic member in a plan view.
<18>
The absorbent article according to <17>, wherein the distance between the leg gather forming elastic member and the fastening member in the vertical direction is 10 mm or more, preferably 15 mm or more.
<19>
A pair of leak-proof cuffs are provided on both sides of the absorbent body including the absorber along the vertical direction.
The absorbent article according to any one of <1> to <18>, wherein the fastening member does not overlap the expansion / contraction region of the leakage-proof cuff in a plan view.
<20>
The absorbent article according to <19>, wherein the fastening member does not overlap with a portion of the leak-proof cuff that has an elastic member for forming a cuff.

<21>
The leak-proof cuff is a bending extending in the vertical direction between a base end portion, a free end portion, and the base end portion and the free end portion, which are the standing ends when standing toward the wearer's skin. Has a part and
Further, it has a first standing portion located between the base end portion and the bent portion, and a second standing portion located between the bent portion and the free end portion.
The absorbent article according to <19> or <20>, wherein the second standing portion extends outward in the lateral direction.
<22>
The absorbent article according to <21>, wherein the leak-proof cuff is provided with a plurality of elastic members for forming a cuff in the second upright portion.

Hereinafter, the present invention will be described in more detail by way of examples. However, the scope of the invention is not limited to such examples. Unless otherwise specified, "%" means "mass%".

[Example 1]
The outer layer sheet 5 and the fastening member 6 in the above-mentioned diaper were prepared. An air-through nonwoven fabric (basis weight 20 g / m ² ) composed of polyethylene terephthalate and polyethylene composite fibers was subjected to calender treatment to form a flat fiber-containing region R, which was used as an outer layer sheet 5. The calendar processing was performed by a two-stage calendar processing using a metal calendar roll and a resin roll. The first-stage calendar processing was performed in a non-heated state under a linear pressure of 255 N / cm, and the second-stage calendar processing was performed in a non-heated state under a linear pressure of 115 N / cm. Further, as the fastening member 6, the air-through nonwoven fabric A1 (basis weight 20 g / m ² ) made of polypropylene and polyethylene composite fibers and the air-through nonwoven fabric A2 (basis weight 15 g) made of polypropylene and polyethylene composite fibers are used. / ^M2 ) was laminated to prepare a sheet in which both air-through nonwoven fabrics A1 and A2 were integrated by embossing.
Further, a composite member in which the fastening member 6 was adhered to the outer layer sheet 5 was produced. Specifically, the adhesive member 6 is attached to the flat fiber-containing region R of the outer layer sheet 5 so that the nonwoven fabric A1 is on the second surface [rubber-based (styrene-butadiene-based) general-purpose hot-melt adhesive. ] Was used to fix it, and this was used as a composite member. The amount of the adhesive used was 20 g / m ² .

[Example 2]
As the outer layer sheet 5, an air-through nonwoven fabric (basis weight 21 g / m ² ) composed of polyethylene terephthalate and polyethylene composite fibers is subjected to pressure opening treatment, and the flat fiber-containing region R other than the opening portion is subjected to pressure opening treatment. A sheet in which the surface contact area ratio was controlled by opening holes was produced.
As the fastening member 6, an air-through nonwoven fabric A3 (basis weight 15 g / m ² ) made of polyethylene terephthalate and polyethylene composite fibers and an air-through nonwoven fabric A4 (tsubo) made of polyethylene terephthalate and polyethylene composite fibers are used. A sheet having an amount of 10 g / m ² ) was laminated and integrated by embossing to prepare a sheet.
Further, the composite member was produced by the same method as in Example 1 except that the fastening member 6 was fixed to the flat fiber-containing region R of the outer layer sheet 5 so that the nonwoven fabric A3 was the second surface. ..

[Comparative Examples 1 and 2]
In Comparative Example 1, two sheets of the nonwoven fabric A1 were laminated to produce an integrated sheet by embossing, and in Comparative Example 2, two sheets of the nonwoven fabric A2 were laminated to produce an integrated sheet by embossing. Each sheet was used as a fastening member. Except for these points, the outer layer sheet 5 and the composite member were produced by the same method as in Example 1.

[Comparative Example 3]
The outer layer sheet 5, the fastening member 6, and the composite member were produced by the same method as in Example 1 except that the flat fiber-containing region R was not formed on the outer layer sheet without calendering.

[Comparative Examples 4 and 5]
In Comparative Example 4, the outer layer sheet 5 was stopped by the same method as in Comparative Example 3, except that the fastening member of Comparative Example 1 was used, and in Comparative Example 5, the fastening member of Comparative Example 2 was used. The attachment member 6 and the composite member were manufactured.

For the outer layer sheet 5 and the fastening member 6 of each Example and the comparative example, the flat fiber-containing region of the outer layer sheet and the surface contact area ratios of the first surface and the second surface of the fastening member were measured. In addition, the average friction coefficient MIU and the average deviation MMD of the friction coefficient of each of the flat fiber-containing region of the outer layer sheet and the second surface of the fastening member were measured. These measurements were performed according to the method described above. The measurement results are shown in Table 1.

[Adhesion between outer layer sheet and fastening member]
The adhesiveness of the outer layer sheet and the fastening member of each Example and Comparative Example was evaluated by the following methods. First, the adhesive [rubber-based (styrene-butadiene-based) general-purpose hot-melt adhesive, usage amount 20 g / m ² ] applied to the release paper in advance is transferred to the second surface (adhesive surface) of the fastening member. Then, it was placed on the flat fiber-containing region R of the outer layer sheet with the adhesive surface facing down. Next, the 1 kg roller was reciprocated three times on the fastening member to fix the fastening member to the outer layer sheet. Next, a measurement piece having a width of 3 cm and a length of 3 cm is cut out from the portion where the fastening member and the outer layer sheet are adhered to each other, and the edge portion of the outer layer sheet in the measurement piece is sandwiched between clips to push-pull gauge (RX-20). , Made by Aiko Engineering Co., Ltd.). Then, the push-pull gauge was pulled until the fastening member was peeled from the outer layer sheet, and the peeling strength between the fastening member and the outer layer sheet was measured. Then, the adhesiveness between the outer layer sheet and the fastening member was evaluated according to the following criteria.
A: The peel strength is 0.4 N or more.
B: The peel strength is less than 0.4N.
From the viewpoint of preventing the influence of the breakage of the sheet, in the above evaluation of the adhesiveness, the adhesive member and the outer layer sheet are adhered to each other with an adhesive strength lower than the actual adhesive strength of the diaper. When the peel strength is 0.4 N or more, it is a guideline that the adhesion between the outer layer sheet and the fastening member in the diaper is sufficient. The evaluation results are shown in Table 1.

[Engagement force between fastening tape and fastening member]
For the composite members of each Example and Comparative Example, the engaging force between the fastening tape 7 and the fastening member 6 was evaluated by the following method. For the fastening tape 7, the fastening tape used in "Mary's Smooth Air Through Tape S size" manufactured by Kao Corporation was prepared. The fastening tape 7 was placed on a fastening member of the composite member, and a 1 kg roller was reciprocated three times on the fastening tape to fasten it. Next, the edge of this fastening tape was clipped and connected to a push-pull gauge (RX-20, manufactured by Aiko Engineering Co., Ltd.). Next, the push-pull gauge is pulled until the fastening tape is detached from the fastening member, the engagement strength between the fastening tape and the fastening member is measured, and the engagement force between the fastening tape and the fastening member is measured according to the following criteria. Was evaluated. When the engagement strength is 2.0 N or more, it is a guideline that the engagement force between the fastening tape and the fastening member is sufficient. The evaluation results are shown in Table 1.
A: The engagement strength is 2.0 N or more.
B: The engagement strength is less than 2.0 N.

As shown in Table 1, in each embodiment, the peel strength between the outer layer sheet and the fastening member was 0.4 N or more, and the engagement strength between the fastening tape and the fastening member was 2.0 N or more. From this result, it was shown that the composite member of each embodiment has excellent adhesiveness between the outer layer sheet and the fastening member while ensuring the engaging force between the fastening tape and the fastening member. In each embodiment, the adhesiveness between the outer layer sheet and the fastening member is excellent without increasing the amount of the adhesive used, so that the texture of the outer layer sheet can be maintained well. On the other hand, in each comparative example, the evaluation of either one or both of the adhesiveness between the outer layer sheet and the fastening member and the engaging force between the fastening tape and the fastening member was low.

According to the absorbent article of the present invention, it is possible to achieve both the adhesiveness of the fastening member on the outer surface of the absorbent article and the texture of the absorbent article while ensuring the engaging force between the fastening tape and the fastening member. can.

Claims

It has a vertical direction corresponding to the front-back direction of the wearer and a lateral direction orthogonal to the vertical direction, and is arranged in the crotch part of the wearer, and the ventral side and the back extending in the front-back direction of the crotch part. It has a side portion, and is provided on both side edges of the dorsal portion along the longitudinal direction, and is provided on a non-skin facing surface of the ventral side portion, and the fastening tape can be fastened. An absorbent article with a fastening member,
The outer layer sheet forming the non-skin facing surface on the ventral side has a flat fiber-containing region in which flat fibers are present on at least the surface on the non-skin facing surface side.
The fastening member has a first surface to which the fastening tape is fastened and a second surface opposite to the first surface, and the second surface has a surface contact area larger than that of the first surface. An absorbent article having a high rate and having the second surface adhered to the flat fiber-containing area.
The absorbent article according to claim 1, wherein the presence rate of the flat fibers in the flat fiber-containing region is 60% or more.
When the surface contact area ratio of the flat fiber-containing region in the outer layer sheet is S1 and the surface contact area ratio of the second surface of the fastening member is S2, the ratio of S2 to S1 (S2 / S1) is. The absorbent article according to claim 1 or 2, which is 0.7 or more and 1.4 or less.
When the surface contact area ratio of the first surface of the fastening member is S3 and the surface contact area ratio of the second surface of the fastening member is S2, the ratio of S2 to S3 (S2 / S3) is 1. The absorbent article according to any one of claims 1 to 3, which is 4 or more and 10 or less.
The absorbent article according to any one of claims 1 to 4, wherein the outer layer sheet has a surface contact area ratio of 70% or more in the flat fiber-containing region.
The absorbent article according to any one of claims 1 to 5, wherein the outer layer sheet has a surface contact area ratio of 70% or more and 100% or less in the flat fiber-containing region.
The absorbent article according to any one of claims 1 to 6, wherein the fastening member has a surface contact area ratio of 70% or more on the second surface.
The absorbent article according to any one of claims 1 to 7, wherein the fastening member has a surface contact area ratio of 80% or more and 100% or less on the second surface.
The absorbent article according to any one of claims 1 to 8, wherein the fastening member has a surface contact area ratio of 50% or less on the first surface.
The absorbent article according to any one of claims 1 to 9, wherein the fastening member has a surface contact area ratio of 10% or more and 50% or less on the first surface.
The absorbent article according to any one of claims 1 to 10, wherein each of the flat fiber-containing region and the second surface has an average friction coefficient of 0.2 or less.
The absorbent article according to any one of claims 1 to 11, wherein the flat fiber-containing region and the second surface each have an average deviation MMD of friction coefficient of 0.008 or less.
The absorbent article according to any one of claims 1 to 12, wherein the flat fiber-containing region or the second surface is coated with an adhesiveness improving agent.
The absorbent article according to any one of claims 1 to 13, wherein the amount of the adhesive used for adhering the outer layer sheet and the fastening member is 10 g / m 2 or more and 30 g / m 2 or less.
The absorbent article according to any one of claims 1 to 14, wherein the fastening member has a laminated structure in which a layer forming the first surface and a layer forming the second surface are laminated. ..
The absorbent article according to claim 15, wherein the layer forming the second surface has a basis weight of 5 g / m 2 or more and 35 g / m 2 or less.
Elastic members for forming leg gathers are arranged in an extended state so as to extend in the vertical direction on each of both side portions of the absorbent article along the vertical direction.
The absorbent article according to any one of claims 1 to 16, wherein the fastening member does not overlap with the leg gather forming elastic member in a plan view.
The absorbent article according to claim 17, wherein the distance between the elastic member for forming leg gathers and the fastening member in the vertical direction is 10 mm or more.
A pair of leak-proof cuffs are provided on both sides of the absorbent body including the absorber along the vertical direction.
The absorbent article according to any one of claims 1 to 18, wherein the fastening member does not overlap the expansion / contraction region of the leakage-proof cuff in a plan view.
The absorbent article according to claim 19, wherein the fastening member does not overlap with a portion of the leak-proof cuff that has an elastic member for forming a cuff.
The leak-proof cuff is a bending extending in the vertical direction between a base end portion, a free end portion, and the base end portion and the free end portion, which are the standing ends when standing toward the wearer's skin. Has a part and
Further, it has a first standing portion located between the base end portion and the bent portion, and a second standing portion located between the bent portion and the free end portion.
The absorbent article according to claim 19 or 20, wherein the second upright portion extends laterally outward.
The absorbent article according to claim 21, wherein the leak-proof cuff is provided with a plurality of elastic members for forming a cuff in the second upright portion.