Absorbent article

Abstract

An absorbent article (1) of the present application includes a fastening tape (7) and a fastening member (6) to which the fastening tape (7) is fastened. An outer sheet (5) on the non-skin-facing side forming the abdominal side portion (A) of the absorbent article (1) has a flat fiber-containing region (R) having flat fibers on at least the surface on the non-skin-facing side. The fastening member (6) has a first surface (61) to which the fastening tape (7) is fastened and a second surface (62) on the opposite side of the first surface (61), the second surface (62) having a higher surface contact area ratio than the first surface (61), and the second surface (62) is bonded to the flat fiber-containing region (R).

Description

Technical Field

[0001] This invention relates to absorbent articles. Background Technology

[0002] An absorbent article is known, comprising a buckle strap and a fastening member for fastening the buckle strap. The absorbent article is worn in a fixed position around the wearer's waist by positioning its two longitudinal ends in a back-to-back manner and fastening the buckle strap to the fastening member.

[0003] For example, Patent Document 1 describes a disposable diaper that includes fastening straps respectively disposed on both sides of the back part and a target strip disposed on the outer surface of the front part and made of thermoplastic resin. The target strip is made of fluffy nonwoven fabric and is heat-fused to a thermoplastic resin sheet constituting the outer surface of the diaper in a predetermined pattern.

[0004] In addition, absorbent articles are known to have a fastening strap that is fastened to a sheet forming the outer surface of the absorbent article.

[0005] For example, Patent Document 2 describes an expandable absorbent article having a fastening band formed partly or entirely of a male part of a face fastener and a locking portion for locking the male part, and including a back sheet formed by hot-pressing a hydrophobic sheet and a nonwoven fabric together with an adhesive made of a water-soluble hot melt resin, wherein the adhesive strength of the hydrophobic sheet and the nonwoven fabric in the back sheet is specified or above, and the back sheet has specified physical properties.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2007-307210

[0009] Patent Document 2: Japanese Patent Application Publication No. 2009-183797 Summary of the Invention

[0010] The present invention relates to an absorbent article having a longitudinal direction corresponding to the front-back direction of the wearer and a transverse direction orthogonal to the longitudinal direction, and having a crotch portion disposed at the crotch of the wearer and a ventral and dorsal portion extending forward and backward toward the crotch portion, and including a fastening strap disposed at the two side edges of the dorsal portion along the aforementioned longitudinal direction and a fastening member disposed on the non-skin-facing surface of the ventral portion and for fastening by the fastening strap.

[0011] The outer sheet forming the non-skin-facing side of the above-mentioned ventral portion preferably has a region containing flat fibers on at least the surface of the non-skin-facing side.

[0012] The fastening component has a first side for fastening the buckle strap and a second side opposite to the first side. Preferably, the surface contact area ratio of the second side is higher than that of the first side, and the second side is bonded to the region containing flat fibers. Attached Figure Description

[0013] Figure 1 This is a perspective view of an unfolded disposable diaper, which is one embodiment of the absorbent article of the present invention.

[0014] Figure 2 It is a schematic representation. Figure 1 The diagram shows a top view of the diaper in its unfolded and stretched state, with the skin-facing side (inner surface side) in the unfolded position.

[0015] Figure 3 yes Figure 2 Sectional view along line II-II.

[0016] Figure 4 Is to make Figure 1 The enlarged top view of the fastening component after partial peeling is shown. Detailed Implementation

[0017] The fastening component of a hook-and-loop fastener is typically attached to the outer surface of an absorbent article using an adhesive. To stably maintain the wearing condition of the absorbent article, including the hook-and-loop fastener and the fastening component, a high bonding strength between the hook-and-loop fastener and the fastening component, as well as reliable fixation of the fastening component to the outer surface of the absorbent article, are desirable. However, excessive use of adhesive for securing the fastening component raises concerns about increased production costs, a decreased feel to the outer surface of the absorbent article, and a stronger odor from the adhesive, among other quality degradations. Patent Document 1 describes an absorbent article where the target strap is secured by heat welding rather than adhesive, but this is insufficient in balancing the secure fastening component at the outer surface of the absorbent article with the feel of the absorbent article. Patent Document 2 does not disclose a technique for securing the fastening component to the outer surface of the absorbent article.

[0018] This invention relates to absorbent articles that can stably secure fastening components to the outer surface of absorbent articles, and also takes into account the feel of absorbent articles.

[0019] Hereinafter, preferred embodiments of the absorbent articles of the present invention will be described. Figures 1-4 A unfolded disposable diaper (hereinafter also simply referred to as "diaper") is shown as one embodiment of the absorbent article of the present invention.

[0020] Figure 2The diaper 1 shown, in its unfolded and extended state, has a longitudinal direction X corresponding to the wearer's front-back direction and extending from the wearer's abdomen through the crotch to the back, and a transverse direction Y orthogonal to the longitudinal direction X. The diaper 1 has an abdominal portion A positioned on the wearer's abdomen when worn, a dorsal portion B positioned on the back, and a crotch portion C positioned at the crotch. That is, the abdominal portion A and the dorsal portion B extend front-back over the crotch portion C. The abdominal portion A, crotch portion C, and dorsal portion B are regions obtained by dividing the diaper 1 into three equal parts along its longitudinal direction X, and extend continuously in the wearer's front-back direction. The crotch portion C has an excretion-facing portion (not shown) positioned opposite the wearer's excretory portion when the diaper 1 is worn.

[0021] In this specification, the "unfolded and elongated state" of diaper 1 refers to the state in which diaper 1 is unfolded, and the elastic components of each part are elongated to expand the unfolded diaper 1 to the designed size (the same size as when it is expanded into a flat shape with the influence of the elastic components completely eliminated).

[0022] Furthermore, the "skin-facing side" refers to the side of the diaper or its components (such as the absorbent core) that faces the wearer's skin when the diaper is worn, while the "non-skin-facing side" is the side of the diaper that faces the opposite side of the wearer's skin when the diaper is worn. In other words, the skin-facing side is the side relatively closer to the wearer's skin, and the non-skin-facing side is the side relatively farther from the wearer's skin. "While wearing" and "wearing state" refer to the state in which the diaper is worn to maintain the correct wearing position.

[0023] like Figure 3 As shown, the diaper 1 includes: a liquid-permeable front sheet 2 forming the skin-facing side; a leak-proof sheet 3 forming the non-skin-facing side that is liquid-resistant (including water-repellent); and a liquid-retaining absorbent body 4 disposed between the front sheet 2 and the leak-proof sheet 3, these components constituting the absorbent body 10. Figure 3 For ease of explanation, the state of the anti-leakage flange 16 standing up as described later is illustrated in the figure.

[0024] The front panel 2 and the leak-proof panel 3 are each larger than the absorbent body 4 and extend outward from the outer periphery of the absorbent body 4. In this embodiment, the two ends of the leak-proof panel 3 in each length direction are approximately aligned with the two ends of the diaper 1 in the length direction.

[0025] Diaper 1 includes a liquid-retaining absorbent body 4. Figure 2 The absorbent body 4 shown is configured such that its length direction is aligned with the longitudinal direction X of the diaper, extending from the ventral side A, through the crotch area C, to the dorsal side B. The two longitudinal edges of the absorbent body 4 are located on the inner side of the two longitudinal edges X of the diaper 1.

[0026] like Figure 3 As shown, the absorber 4 is formed by encapsulating a liquid-permeable chip 4b with an absorbent core 4a having absorbent properties.

[0027] The diaper 1 includes a pair of leak-proof flaps 16, 16 disposed along both sides of the absorbent body 10 in the longitudinal direction X.

[0028] The leak-proof fold 16 is composed of a filamentous fold-forming elastic member 16a and a water-repellent and breathable fold-forming sheet 16b. The leak-proof fold 16 rises at least at the crotch C on the side facing the wearer's skin by the contraction of the fold-forming elastic member 16a, thereby inhibiting the outward flow of excrement such as urine in the transverse Y direction.

[0029] like Figure 1 and Figure 2 As shown, the diaper 1 has a pair of fastening straps 7, 7 on both sides of the back side B along the longitudinal direction X. Each fastening strap 7 is arranged to extend outward from both sides of the back side B along the longitudinal direction X in the transverse direction Y. One end of each fastening strap 7 on the inner side of the transverse direction Y is fixed to a sheet component constituting the diaper 1, preferably fixed between the sheet components constituting the diaper 1, for example, fixed between the leak-proof sheet 3 and the outer sheet 5 (not shown).

[0030] The fastening strap 7 of this embodiment has a substrate 70 and a connecting portion 71 fixed to the skin-facing surface of the substrate 70. The connecting portion 71 has connecting protrusions on its skin-facing surface. As the connecting portion 71, a male component of a mechanical fastener can be used. A mechanical fastener is composed of a male component having a plurality of connecting protrusions disposed on its surface and a female component having a material disposed on its surface that can directly bond with the connecting protrusions. It refers to a fastener that bonds the male component and the female component by making surface contact. As a mechanical fastener, various known components can be used without particular limitation.

[0031] The diaper 1 includes a fastening member 6 on the non-skin-facing side of the ventral portion A, which can be detachably fastened to the connecting portion 71 of the hook-and-loop fastener 7. This fastening member 6 is constructed by including the female component of the aforementioned mechanical hook-and-loop fastener. The material of the portion of the fastening member 6 that is fastened to the connecting portion 71, i.e., the material of the female component, can be selected according to the shape of the connecting protrusion of the connecting portion 71. For example, a nonwoven fabric with good bonding properties, such as a loop portion or a mesh portion, can be used as the material of the female component.

[0032] The fastening component 6 is disposed on the outer layer 5, which is formed on the non-skin-facing side of the diaper 1 in the ventral side A.

[0033] like Figure 3As shown, the diaper 1 of this embodiment includes an outer layer 5 disposed on the non-skin-facing side of the absorbent body 10, that is, on the non-skin-facing side compared to the leak-proof sheet 3. The outer layer 5 forms the outer surface (non-skin-facing side) of the diaper 1. In this embodiment, the outer layer 5 extends from the ventral side A, through the crotch area C, to the dorsal side B in the longitudinal direction X. The outer layer 5 forms the shape of the diaper 1 in its unfolded and elongated state, and the periphery of the outer layer 5 forms the outlines of the ventral side A, the crotch area C, and the dorsal side B, respectively.

[0034] like Figure 2 As shown, the central side of the longitudinal X of the diaper 1 in this embodiment, namely the crotch C and the crotch C side of the abdominal side A and the back side B, is tapered. Compared with the crotch C side, the ends of the longitudinal X of the abdominal side A and the back side B extend laterally outward in the transverse Y direction.

[0035] The outer sheet 5 extends outward from both sides of the absorber 4 along the longitudinal direction X towards the outer side in the transverse direction Y, forming the side wing portion SF together with the leak-proof sheet 3 and the flange forming sheet 16b constituting the leak-proof flange 16. The side wing portion SF is composed of sheet components extending outward from both sides of the absorber 4 along the longitudinal direction X towards the outer side in the transverse direction Y. The sheet components constituting the side wing portion SF extend from the ventral side A through the crotch area C to the dorsal side B. At the extension portions extending outward from both sides of the absorber 4 towards the outer side in the transverse direction Y, the sheet components constituting the side wing portion SF are joined together by known joining methods such as adhesive, heat sealing, and ultrasonic sealing.

[0036] In the diaper 1 of this embodiment, as Figure 2 As shown, the elastic member 15 for forming leg folds is arranged in an extended state on both sides of the diaper 1 along the longitudinal X direction, specifically on a pair of side wings SF, SF1. This allows leg folds to be formed on the left and right sides around the wearer's legs, i.e., on both sides of the diaper 1 along the longitudinal X direction, by the contraction of the elastic member 15. In this embodiment, the elastic member 15 for forming leg folds is fixed in an extended state between the flange forming piece 16b and the leak-proof piece 3 of the side wing SF.

[0037] The outer layer 5 has a flat fiber-containing region R on at least the non-skin-facing surface of the ventral portion A. A fastening member 6 is provided in this flat fiber-containing region R of the ventral portion A. The fastening member 6 is adhered to the flat fiber-containing region R. In this embodiment, at least the portion of the outer layer 5 in the ventral portion A to which the fastening member 6 is adhered forms the flat fiber-containing region R, the area of ​​the flat fiber-containing region R is larger than the area of ​​the fastening member 6, and the fastening member 6 overlaps entirely with the flat fiber-containing region R.

[0038] Flat fibers are fibers whose cross-sectional flatness ratio (major axis length / minor axis length) is 1.2 or higher. For example, the flatness ratio is 1 when the cross-section of the fiber is a perfect circle, and the flatness ratio becomes greater than 1 as the cross-section becomes flatter (closer to an elliptical shape).

[0039] From the viewpoint of improving the adhesiveness of the fastening component 6, the presence rate of flat fibers in the flat fiber-containing region R is preferably 60% or more, more preferably 70% or more. There is no particular upper limit to the presence rate of flat fibers in the flat fiber-containing region R, and it can be 100%. This presence rate of flat fibers is determined by the following measurement method.

[0040] [Method for determining the presence rate of flat fibers in region R containing flat fibers]

[0041] Remove the outer layer 5 of the ventral side A from the diaper 1, and peel off the fastening component 6 from the outer layer 5. Cut a test piece from the area where the fastening component 6 is attached on the non-skin-facing side of the outer layer 5. The test piece is quadrilateral in shape (8mm × 4mm) when viewed from above, and can be obtained by cutting the outer layer 5 with a razor (e.g., a single-blade razor manufactured by Feather Safety Razor Co., Ltd.). When cutting the outer layer 5, care should be taken to prevent damage to the structure of the cut surface of the test piece formed by the cutting, such as pressure. As a preferred cutting method, one can list the method of immersing the outer layer 5 in liquid nitrogen to fully freeze it before cutting. Attach the test piece to the test stage using double-sided paper tape ("Nicetack NW-15" manufactured by NICHIBAN Co., Ltd.). Then, platinum is applied to the test piece. The coating was performed using an E-1030 ion sputtering apparatus (trade name) manufactured by Hitachi Naka Seiki Co., Ltd., with a sputtering time set to 30 seconds. Next, the cross-section of the test piece was observed at 1000x magnification using an S-4000 field emission scanning electron microscope manufactured by Hitachi, Ltd. The cross-section of the fibers present on the non-skin-facing side of the test piece was observed, and the long axis and short axis of the fiber cross-section were measured. The flatness ratio of the fiber was calculated by dividing the long axis by the short axis. This measurement was performed on 10 fibers, and the ratio of the number of fibers with a flatness ratio (long axis / short axis) of 1.2 or higher to the total number of fibers was determined, which was taken as the percentage of flattened fibers.

[0042] When removing the outer layer 5, fastening components 6, and other constituent parts from the diaper 1 and measuring their physical properties, if the constituent parts are fixed to other constituent parts by adhesive, cold air is blown onto the fixed part to peel off the other constituent parts. Then, the adhesive adhering to the constituent parts being tested is dissolved and removed by using an organic solvent. This operation is common to all tests in this manual.

[0043] As a method for obtaining flat fibers, i.e. fibers with a large degree of flattening of cross-section, the following known methods can be listed: (1) a method of spinning using a spinneret with a flatness corresponding to the desired flatness; (2) a method of post-processing such as pressurizing the pile of fibers obtained using a conventional spinneret (with a circular or similar cross-section). In the above method (1), the flatness of the spinneret can be the same as or higher than the flatness of the target fiber.

[0044] From the viewpoint of reliably aligning the long axis of the flat fibers along the planar direction of the nonwoven fabric to further improve the adhesiveness of the fastening member 6, the method described in (2) above is preferred. The method described in (2) above can be implemented, for example, by heating and pressing a fiber assembly (nonwoven fabric) containing fibers with a circular cross-section as needed. This method can be implemented, for example, by calendering.

[0045] The outer sheet 5 may have a region R containing flat fibers at least in the ventral portion A. In this embodiment, the outer sheet 5 has a region R containing flat fibers in a partial area of ​​the ventral portion A. Alternatively, the outer sheet 5 may have a region R containing flat fibers in the entire area of ​​the ventral portion A, or the entire area of ​​the outer sheet 5 may have a region R containing flat fibers.

[0046] like Figure 4 As shown, the fastening member 6 has a first surface 61 for fastening the hook and loop strap 7 and a second surface 62 opposite to the first surface 61. The first surface 61 is the surface that engages with the engagement protrusion in the engagement portion 71 of the hook and loop strap 7, and is provided with a ring portion or other engagement portion (female member) that engages with the engagement protrusion. The second surface 62 is bonded to the region R containing flat fibers via an adhesive.

[0047] The first surface 61 and the second surface 62 of the fastening component 6 have different surface contact area ratios. Specifically, the second surface 62 has a higher surface contact area ratio than the first surface 61. Surface contact area ratio is an indicator of the degree of unevenness of a surface. The surface contact area ratio is determined by the method described later.

[0048] like Figure 1As shown, in this embodiment, the diaper 1 is fastened to the fastening member 6 via a hook-and-loop fastener 7, forming a waist opening WH for the wearer's waist to pass through and a pair of leg openings LH for the wearer's lower limbs to pass through, for the wearer to wear. In this embodiment, the fastening member 6 is bonded to the flat fiber region R of the outer layer 5, thus the adhesion between the fastening member 6 and the outer layer 5 is excellent. This is because the presence of flat fibers in the portion where the fastening member 6 is bonded, and the second surface 62 having a larger surface contact area ratio than the first surface 61 as the bonding surface with the outer layer 5, ensures a large contact area between the outer layer 5 and the fastening member 6. Furthermore, in the fastening member 6, the first surface 61, which has a lower surface contact area ratio, is located on the surface opposite to the skin-facing side of the diaper 1, thus improving the adhesion with the outer layer 5, while easily ensuring the bonding force between the fastening member 6 and the fastening member 71 in the hook-and-loop fastener 7.

[0049] According to the diaper 1 of this embodiment, the bonding strength between the fastening member 6 and the outer layer 5 can be increased without increasing the amount of adhesive used, or the amount of adhesive used can be reduced while maintaining the bonding strength between the fastening member 6 and the outer layer 5 at the same level as before.

[0050] According to this embodiment, the diaper 1 can ensure the adhesion between the outer layer 5 and the fastening member 6 even without using a large amount of adhesive, thus maintaining the feel of the outer surface of the diaper 1 well and suppressing the generation of odor caused by a large amount of adhesive.

[0051] [Methods for determining surface contact area ratio]

[0052] A measuring piece measuring 60mm longitudinally and 30mm laterally is cut from the fastening component 6. The measuring piece is placed on a horizontal platform without pressure, with the side to be measured (first side 61 or second side 62) facing upwards. A transparent acrylic plate is placed on the measuring piece, and a counterweight is placed on the acrylic plate to apply pressure of 1.7 kPa to the measuring piece. Next, the surface shape of the side to be measured in the pressurized measuring piece is measured using a Keyence KS-1100 high-precision shape measurement system. Specifically, the thickness at various locations in the measuring piece is measured. The measurement conditions are set to a measurement pitch of 50 μm and a moving speed of 10 cm / s, measuring a range of 30mm longitudinally and 30mm laterally. The resulting measurement results (images) are analyzed using the Keyence KS-Analyzer shape analysis application. Then, the location with the maximum thickness and the location with a thickness difference of less than 200 μm from the maximum thickness are selected as "high-thickness areas". Furthermore, locations in the measurement piece where the thickness difference from the maximum thickness exceeds 200 μm are designated as "low-thickness regions." These high-thickness and low-thickness regions are binarized to determine the area of ​​the high-thickness regions. Specifically, the aforementioned image is imported into Image-Pro Plus (manufactured by ROPER Co., Ltd., Japan), and the black-and-white contrast is set to 100 using contrast enhancement. After noise removal through filtering (median, 5×5 repeated 5 times), counting is performed to determine the total area of ​​the high-thickness regions displayed in white or black. Then, the total area of ​​the high-thickness regions is divided by the area of ​​the measurement piece (30 mm vertically × 30 mm horizontally) to obtain the surface contact area ratio.

[0053] When measuring the surface contact area ratio of the region R containing flat fibers in the outer layer 5, the portion from which the fastening component 6 was removed was cut out and used as the measuring piece.

[0054] From the viewpoint of further balancing the adhesion between the outer layer 5 and the fastening member 6 and the feel of the outer surface of the diaper 1, when the surface contact area ratio of the flat fiber region R in the outer layer 5 is taken as S1 and the surface contact area ratio of the second surface 62 in the fastening member 6 is taken as 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, more preferably 1.3 or less.

[0055] From the viewpoint of further balancing the bonding force between the hook and loop fastener 7 and the fastening member 6, as well as the adhesion between the outer layer 5 and the fastening member 6, when the surface contact area ratio of the first surface 61 in the fastening member 6 is taken as S3 and the surface contact area ratio of the second surface 62 in the fastening member 6 is taken as S2, the ratio of S2 to S3 (S2 / S3) is preferably 1.4 or more, more preferably 1.5 or more, and preferably 10 or less, more preferably 9 or less.

[0056] From the viewpoint of further improving the adhesion between the outer layer 5 and the fastening member 6, it is preferable that the surface contact area ratio of the flat fiber region R of the outer layer 5 and the second surface 62 of the fastening member 6 are each within the following range.

[0057] The surface contact area ratio of the flat fiber-containing region R of the outer layer sheet 5 is preferably 70% or more, more preferably 80% or more, and further preferably 100% or less, more preferably 95% or less. It is also preferably 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 can be controlled, for example, by forming openings in the sheet. Furthermore, the flat fiber-containing region R can be formed outside the opening portion by performing a pressure-opening process on the sheet.

[0058] 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. There is no particular upper limit to the surface contact area ratio of the second surface 62, but it is preferred to be as close to 100% as possible.

[0059] From the viewpoint of further improving the bonding force between the hook and loop fastener 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, and preferably 50% or less, more preferably 40% or less. In addition, it is preferably 10% or more and 50% or less, more preferably 20% or more and 40% or less.

[0060] From the viewpoint of further improving the adhesion between the outer layer 5 and the fastening member 6, the average coefficient of friction MIU of the flat fiber region R and the second surface 62 is preferably 0.2 or less, more preferably 0.19 or less. There is no particular limitation on the lower limit of the average coefficient of friction MIU of the flat fiber region R and the second surface 62, but it is preferred to be as close to 0 as possible.

[0061] Regarding the same point above, the average deviation (MMD) of the friction coefficients of the flat fiber 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 coefficients of the flat fiber region R and the second surface 62, but it is preferred to be closer to 0.

[0062] [Methods for determining the average coefficient of friction (MIU) and the average deviation of the coefficient of friction (MMD)]

[0063] Using a KES-FB4 surface testing machine (manufactured by Kado Technology Co., Ltd.), a pressure of 5 kPa (50 gf / cm) was applied to the test object through a contact element. 2 Under load, the contact element is moved 3 cm horizontally at a fixed speed of 0.1 cm / sec. The coefficient of friction and the average deviation of the coefficient of friction of the area where the contact element moves are measured at three points spaced apart in the transverse Y direction. The average value is taken as the average coefficient of friction MIU and the average deviation of the coefficient of friction MMD of the plate.

[0064] When the object of measurement is the region R containing flat fibers of the outer layer 5, the part with the fastening component 6 removed is taken as the region R containing flat fibers, and the average friction coefficient MIU and the average deviation of the friction coefficient MMD are measured.

[0065] The outer layer 5 and the fastening component 6 are bonded together by an adhesive. Known adhesives such as hot melt adhesives can be used as the adhesive.

[0066] From the viewpoint of ensuring the bonding strength between the outer layer 5 and the fastening component 6, and further improving the feel of the non-skin-facing side of the diaper 1, the amount of adhesive used to bond the outer layer 5 and the fastening component 6 is 10 g / m². 2 The above, preferably 15g / m 2 In addition, the preferred value is 30g / m³. 2 The following is more preferably 25g / m 2 Furthermore, 10 g / m² is preferred. 2 Above and 30g / m 2 The following is more preferably 15g / m 2 Above and 25g / m 2 the following.

[0067] From the viewpoint of ensuring the adhesion between the outer layer 5 and the fastening member 6 even under high humidity conditions, it is preferable to apply an adhesion enhancer to the region R containing the flat fibers or the second surface 62. That is, it is preferable to apply the adhesion enhancer to the bonding portions of both the outer layer 5 and the fastening member 6. The adhesion enhancer is used to improve the adhesion based on the adhesive. When bonding components coated with this adhesion enhancer using an adhesive, they can be bonded more firmly than when bonded by the adhesive alone. As an adhesion enhancer, a formulation composed of a hydrophobic substance can be used. The adhesion enhancer preferably contains an oily component. Examples of oily components include vegetable oils, organosilicon compounds, and C. 12 ~C 22 Fatty acids or their glycerol ester compounds, C 12 ~C44 Fatty acid ethers, C 12 ~C 22 Fatty alcohols, petrolatum, etc.

[0068] They are preferably made from plant oils. Examples of plant oils include olive oil, jojoba oil, rice oil, shea butter, tea oil, aloe vera oil, argan oil, and peach oil.

[0069] The adhesion improver can incorporate one or more of the aforementioned oily components. As the adhesion improver, a composition containing one or more of the aforementioned components can be used. As an adhesion improver, skin care agents preferably containing shea butter, argan oil, or peach oil, or skin care agents containing stearyl alcohol, etc., can be used.

[0070] When applying an adhesive enhancer to the flat fiber region R, the application should be made only to the portion of the flat fiber region R to which the fastening component 6 is to be bonded. The adhesive enhancer can be applied to either the flat fiber region R or the second surface 62, or to both.

[0071] From the viewpoint that it is easier to make the surface contact area ratio of the second surface 62 higher than that of the first surface 61, it is preferable to perform a gap-sealing treatment on the second surface 62 of the fastening member 6 to close the gaps between the fibers. The gap-sealing treatment can be performed without particular limitation using methods for closing the gaps between the fibers forming the second surface 62. Examples of such treatments include heat treatment, ultrasonic treatment, and ink coating treatment.

[0072] The forming materials of each part of the diaper in the above embodiment will be described in detail. As the front sheet 2, the leak-proof sheet 3, and the absorbent body 4, the materials that have been used in absorbent articles can be used without particular restrictions.

[0073] For example, liquid-permeable nonwoven fabrics and perforated membranes can be used as the front sheet 2.

[0074] As a leak-proof sheet 3, liquid-impermeable resin films, laminates of resin films and non-woven fabrics, etc., can be used.

[0075] In the absorbent body 4, the absorbent core 4a can be made of an aggregate of hydrophilic fibers such as wood pulp or hydrophilized synthetic fibers, or a material that retains the absorbent polymer in the aggregate. Furthermore, the cover chip 4b can be made of the same material as the front sheet 2.

[0076] The outer layer 5 and the edge-forming sheet 16b can be made of nonwoven fabrics manufactured by various methods, such as spunbond nonwoven fabrics, hot-air nonwoven fabrics, spunlace nonwoven fabrics, thermally bonded nonwoven fabrics, meltblown nonwoven fabrics, or laminated nonwoven fabrics thereof. The outer layer can be composed of a single sheet or, instead, a laminate of multiple sheets. Furthermore, water-repellent nonwoven fabrics can be used as the edge-forming sheet 16b.

[0077] The elastic components, such as the elastic component 16a for forming the flange and the elastic component 15 for forming the leg pleats in the leak-proof flange 16, can be made from various known elastic materials commonly used in such absorbent articles without particular limitation. Examples of elastic materials include synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and chloroprene rubber, natural rubber, EVA, stretchable polyolefins, and polyurethane. As for the shape of the elastic component, filamentous (rubber filaments, etc.) or strip-shaped (rubber strips, etc.) elastic components with cross-sections of rectangles, squares, circles, polygons, etc., are preferred, as are multifilamentous elastic components.

[0078] The materials used to form the base material 70 of the hook and loop fastener 7, the connecting portion 71, and the fastening member 6 can generally be any materials used in unfoldable disposable diapers without particular restrictions. Furthermore, the shape of the connecting protrusion in the connecting portion 71 is not particularly limited and can be hook-shaped, anchor-shaped, claw-shaped, etc.

[0079] For example, the hook and loop strap 7 and the fastening component 6 can use mechanical hook and loop fasteners such as "Magic Tape" (Kuraray), "Quicklon" (YKK), and "Magi Cloth" (Kanebo BellTouch). From the viewpoint of ease of connection, when using nonwoven fabric for the fastening component 6, hot-air nonwoven fabric is preferred.

[0080] As the forming material of the substrate 70, sheets, nonwoven fabrics, etc., made of synthetic resins such as polyethylene, polypropylene, and polyethylene terephthalate, as well as composite materials of two or more of these synthetic resins, can be used.

[0081] From the viewpoint that it is easier to make the surface contact area ratios of the first surface 61 and the second surface 62 different, the fastening member 6 preferably has a stacked structure of two or more layers formed by stacking the layer forming the first surface 61 and the layer forming the second surface 62. Examples of fastening members 6 of this form include female parts of mechanical fasteners and parts made of nonwoven fabric layers, such as nonwoven fabric layers that can be directly bonded to the bonding protrusion, and other nonwoven fabric layers.

[0082] When the fastening member 6 has the above-described laminated structure, from the viewpoint that it is easy to make the surface contact area ratio of the second surface 62 higher than that of the first surface 61, the basis weight of the layer forming the second surface 62 is preferably 5 g / m². 2 The above, more preferably 10g / m 2 In addition to the above, the preferred value is 35g / m³. 2 The following is more preferably 30g / m 2 Furthermore, 5g / m² is preferred. 2 Above and 35g / m 2 The following is more preferably 10g / m 2 Above and 30g / m 2 the following.

[0083] like Figure 2 As shown, it is preferable from the viewpoint of the adhesion between the outer layer 5 and the fastener 6 when the diaper 1 is worn, that the fastener 6 does not overlap with the elastic member 15 for forming leg folds when viewed from above. It is particularly preferable that the elastic member 15 for forming leg folds and the fastener 6 are spaced apart in the longitudinal direction X when the diaper 1 is unfolded and extended. Therefore, even with a reduced adhesive dosage, the adhesion between the outer layer 5 and the fastener 6 can be maintained more stably during wear.

[0084] From the viewpoint of more reliably achieving the aforementioned effect, the longitudinal distance between the elastic member 15 for forming leg folds and the fastening member 6 in the longitudinal direction X is preferably 10 mm or more, more preferably 15 mm or more. The aforementioned distance is the longitudinal distance between the end of the elastic member 15 for forming leg folds in the abdominal side A and the end of the fastening member 6 on the crotch C side, in the unfolded and stretched state of the diaper 1.

[0085] From the viewpoint of further improving the adhesion between the outer layer 5 and the fastening member 6 when the diaper 1 is worn, it is preferable to... Figure 2As shown, the fastening member 6 does not overlap with the telescopic area of ​​the leak-proof flange 16 when viewed from above. The telescopic area of ​​the leak-proof flange 16 is the area that can telescopically extend and retract along the longitudinal direction X by means of the flange-forming elastic member 16a. As examples of how the fastening member 6 does not overlap with the aforementioned telescopic area, in addition to the method in which the fastening member 6 does not overlap with the leak-proof flange 16 itself when viewed from above, the method in which the fastening member 6 does not overlap with the portion having telescopic capability based on the flange-forming elastic member 16a when viewed from above can also be listed. For example, the method in which the fastening member 6 overlaps only with the non-telescopic portion of the flange-forming elastic member 16a, and the method in which it overlaps only with the non-telescopic portion of the leak-proof flange 16, can be listed. The "non-telescopic portion of the flange-forming elastic member 16a" is, for example, the portion of the elastic member 16a disposed in a non-extended state on the flange-forming piece 16b. The "non-telescopic portion of the leak-proof flange 16" is, for example, the portion of the flange-forming piece 16b fixed to other components of the diaper 1 and not telescopic.

[0086] The leak-proof fold 16 has a base end and a free end that stand up towards the wearer's skin. The leak-proof fold 16 preferably has a folded portion extending longitudinally X between the base end and the free end, and extending laterally Y outward between the folded portion and the free end. More specifically, the leak-proof fold 16 preferably has a first standing portion located between the base end and the folded portion and a second standing portion located between the folded portion and the free end, the second standing portion extending laterally Y outward. With this configuration, the central region of the outer sheet 5 (the region between the pair of leak-proof folds 16, 16) easily becomes flat, enabling more stable adhesion between the fastening member 6 and the outer sheet 5. Especially on the central side of the fastening member 6 in the transverse Y direction, the effect of wrinkles caused by the stretching of the leak-proof fold 16 on the first surface 61 is reduced, thus making the fastening of the hook and loop strap 7 to the first surface 61 of the fastening member 6 more reliable. This effect is effective for small-sized diapers 1 such as those for infants. Furthermore, by having a second raised section, the contact area between the wearer's skin and the leak-proof flange 16 can be increased, thereby improving the side leakage suppression performance of excrement.

[0087] Furthermore, when the second upright portion of the leak-proof fold 16 includes a plurality of fold forming elastic members 16a, the fold forming elastic members 16a are spaced apart from the fastening member 6 in the thickness direction of the diaper 1, so that wrinkles are less likely to occur on the fastening member 6 due to the stretching and contraction of the elastic members, which is preferable from this point of view.

[0088] The present invention has been described above based on preferred embodiments, but the present invention is not limited to the above embodiments.

[0089] Furthermore, the aforementioned absorbent articles are so-called unfoldable disposable diapers with fastening straps, but can also be adapted to diaper covers (pad retainers), or straps that can be worn and removed around the waist; they can be articles for infants or adults. The absorbent articles of the present invention broadly include articles for absorbing bodily fluids (urine, loose stools, menstrual blood, sweat, etc.) excreted from the human body. Examples include incontinence pads, sanitary napkins, and menstrual panties.

[0090] Regarding the embodiments of the present invention described above, the following absorbent articles are further disclosed.

[0091] <1>

[0092] An absorbent article has a longitudinal direction corresponding to the wearer's front-back direction and a transverse direction orthogonal to the longitudinal direction, and has a crotch portion disposed at the wearer's groin area, and a ventral and dorsal portion extending forward and backward toward the crotch portion, and includes: a fastening strap disposed on both sides of the dorsal portion along the aforementioned longitudinal direction; and a fastening member disposed on the non-skin-facing surface of the ventral portion for fastening the fastening strap.

[0093] The outer layer forming the aforementioned ventral portion, on the non-skin-facing side, has at least one region containing flat fibers on its surface.

[0094] The fastening component has a first surface for fastening the buckle strap and a second surface opposite to the first surface. The surface contact area ratio of the second surface is higher than that of the first surface. The second surface is bonded to the region containing flat fibers.

[0095] <2>

[0096] As mentioned above <1> The absorbent article wherein the presence rate of the flat fibers in the region containing the flat fibers is 60% or more, preferably 70% or more.

[0097] <3>

[0098] As mentioned above <1> or <2> The absorbent article wherein, when the surface contact area ratio of the flat fiber-containing region in the outer sheet is taken as S1 and the surface contact area ratio of the second surface in the fastening member is taken as S2, the ratio of S2 to S1 (S2 / S1) is 0.7 or more and 1.4 or less, preferably 0.8 or more and 1.3 or less.

[0099] <4>

[0100] As mentioned above <1> ~ <3> In any one of the absorbent articles, when the surface contact area ratio of the first surface in the fastening member is S3 and the surface contact area ratio of the second surface in the fastening member is S2, the ratio of S2 to S3 (S2 / S3) is 1.4 or more and 10 or less, preferably 1.5 or more and 9 or less.

[0101] <5>

[0102] As mentioned above <1> ~ <4> The absorbent article according to any one of the above-mentioned methods, wherein the surface contact area ratio of the outer layer containing the flat fiber region is 70% or more.

[0103] <6>

[0104] As mentioned above <1> ~ <5> The absorbent article according to any one of the above-mentioned methods, wherein the surface contact area ratio of the outer layer sheet containing the flat fiber region is 70% or more and 100% or less, preferably 80% or more and 95% or less.

[0105] <7>

[0106] As mentioned above <1> ~ <6> The absorbent article according to any one of the above-mentioned methods, wherein the surface contact area ratio of the second surface of the above-mentioned fastening member is 70% or more.

[0107] <8>

[0108] As mentioned above <1> ~ <7> In any one of the absorbent articles, the surface contact area ratio of the second surface of the fastening member is 80% or more and 100% or less.

[0109] <9>

[0110] As mentioned above <1> ~ <8> In any one of the absorbent articles, the surface contact area ratio of the first surface of the fastening member is 50% or less.

[0111] <10>

[0112] As mentioned above <1> ~ <9> In any one of the absorbent articles, the surface contact area ratio of the first surface of the fastening member is 10% or more and 50% or less, preferably 20% or more and 40% or less.

[0113] <11>

[0114] As mentioned above <1> ~ <10> The absorbent article according to any one of the above-mentioned flat fiber-containing region and the above-mentioned second surface each have an average coefficient of friction (MIU) of 0.2 or less.

[0115] <12>

[0116] As mentioned above <1> ~ <11> The absorbent article according to any one of the following, wherein the average deviation (MMD) of the coefficient of friction of the flat fiber-containing region and the second surface is 0.008 or less.

[0117] <13>

[0118] As mentioned above <1> ~ <12> The absorbent article according to any one of the following, wherein an adhesion enhancer is applied to the region containing the flat fibers or the second surface.

[0119] <14>

[0120] As mentioned above <1> ~ <13> In any one of the absorbent articles, the amount of adhesive used to bond the outer sheet and the fastening member is 10 g / m². 2 Above and 30g / m 2 The preferred value is 15g / m³. 2 Above and 25g / m 2 the following.

[0121] <15>

[0122] As mentioned above <1> ~ <14> The absorbent article according to any one of the above, wherein the fastening member has a laminated structure formed by the layer forming the first surface and the layer forming the second surface.

[0123] <16>

[0124] As mentioned above <15> The absorbent article wherein the basis weight of the layer forming the second surface is 5 g / m³. 2 Above and 35g / m 2 The following is preferred: 10g / m 2 Above and 30g / m 2 the following.

[0125] <17>

[0126] As mentioned above <1> ~ <16> In any one of the absorbent articles, the elastic members for forming leg pleats are respectively disposed in an elongated state on both sides of the absorbent article along the longitudinal direction in a manner extending along the longitudinal direction.

[0127] The aforementioned fastening component does not overlap with the aforementioned elastic component for forming leg folds when viewed from above.

[0128] <18>

[0129] As mentioned above <17> In the absorbent article, the distance between the elastic member for forming leg folds and the fastening member in the longitudinal direction is 10 mm or more, preferably 15 mm or more.

[0130] <19>

[0131] As mentioned above <1> ~ <18> The absorbent article according to any one of the following descriptions, wherein a pair of leak-proof flanges are provided on both sides of the absorbent body containing the absorbent body along the aforementioned longitudinal direction.

[0132] The aforementioned fastening components do not overlap with the aforementioned leak-proof flange expansion area when viewed from above.

[0133] <20>

[0134] As mentioned above <19> The absorbent article wherein the fastening member does not overlap with the stretchable portion of the elastic member forming the flange of the leak-proof flange.

[0135] <21>

[0136] As mentioned above <19> or <20> The absorbent article, wherein the leak-proof gusset has: a base end, which becomes an upright end facing the wearer's skin; a free end; and a folded portion, which extends longitudinally between the base end and the free end.

[0137] It also includes: a first upright portion located between the aforementioned base end portion and the aforementioned bent portion; and a second upright portion located between the bent portion and the free end portion.

[0138] The aforementioned second upright portion extends outward in the aforementioned lateral direction.

[0139] <22>

[0140] As mentioned above <21> The absorbent article wherein the leak-proof flange includes a plurality of elastic members for flange forming in the second upright portion.

[0141] Example

[0142] The present invention will now be described in more detail through embodiments. However, the scope of the present invention is not limited to the embodiments described herein. Unless otherwise specified, "%" refers to "mass %".

[0143] [Example 1]

[0144] Prepare the outer layer 5 and fastening components 6 for the diaper described above. For hot-air nonwoven fabric (20 g / m²) made of a composite fiber of polyethylene terephthalate and polyethylene. 2The flat fiber region R is formed by calendering and used as the outer sheet 5. The calendering process is performed in two stages using metal calendering rolls and resin rolls. The first stage calendering is performed without heating at a linear pressure of 255 N / cm, and the second stage calendering is performed without heating at a linear pressure of 115 N / cm. Furthermore, as the fastening component 6, a sheet is made of hot-air nonwoven fabric A1 (20 g / m²) with composite fibers of polypropylene and polyethylene as the constituent fibers. 2 ) and hot-air nonwoven fabric A2 (15 g / m²) with composite fibers of polypropylene and polyethylene as the constituent fibers. 2 The two hot air nonwoven fabrics A1 and A2 are layered and embossed to form a sheet.

[0145] Furthermore, a composite component is fabricated by bonding the fastening component 6 to the outer layer 5. Specifically, with the aforementioned nonwoven fabric A1 as the second surface, the fastening component 6 is fixed to the flat fiber-containing area R of the outer layer 5 using an adhesive (a general-purpose hot-melt adhesive based on rubber (styrene-butadiene)) to form the composite component. The amount of adhesive used is 20 g / m². 2 .

[0146] [Example 2]

[0147] As the outer layer 5, a sheet is made as follows: a hot-air nonwoven fabric (21 g / m²) with composite fibers of polyethylene terephthalate and polyethylene as the constituent fibers. 2 A pressure-opening process is performed to form a flat fiber region R in the area other than the opening, and a sheet is made by controlling the surface contact area ratio through the opening.

[0148] As the fastening component 6, the following sheet is made: a hot-air nonwoven fabric A3 (15 g / m²) with composite fibers of polyethylene terephthalate and polyethylene as the constituent fibers. 2 ) and hot-air nonwoven fabric A4 (10 g / m²) with composite fibers of polyethylene terephthalate and polyethylene as the constituent fibers. 2 The layers are stacked and integrated through embossing to form a sheet.

[0149] In addition, except that the fastening component 6 is fixed to the point containing the flat fiber region R of the outer layer 5 with the nonwoven fabric A3 as the second surface, the composite component is made by the same method as in Example 1.

[0150] [Compare Examples 1 and 2]

[0151] In Comparative Example 1, a sheet was made by laminating two pieces of the above-mentioned nonwoven fabric A1 and integrating them through embossing. In Comparative Example 2, a sheet was made by laminating two pieces of the above-mentioned nonwoven fabric A2 and integrating them through embossing. These sheets were used as fastening components. Apart from this, the outer layer sheet 5 and the composite component were made using the same method as in Example 1.

[0152] [Comparative Example 3]

[0153] Except that no calendering process is performed and no flat fiber region R is formed in the outer sheet, the outer sheet 5, the fastening component 6 and the composite component are manufactured by the same method as in Example 1.

[0154] [Compare Examples 4 and 5]

[0155] In Comparative Example 4, except that the fastening component of Comparative Example 1 is used, the outer layer 5, the fastening component 6, and the composite component are manufactured in the same way as in Comparative Example 3. In Comparative Example 5, except that the fastening component of Comparative Example 2 is used, the outer layer 5, the fastening component 6, and the composite component are manufactured in the same way as in Comparative Example 3.

[0156] For each embodiment and comparative example, the surface contact area ratio of the flat fiber-containing region of the outer layer 5 and the first and second surfaces of the fastening member 6 were measured. Furthermore, the average coefficient of friction (MIU) and the average deviation of the coefficient of friction (MMD) of the flat fiber-containing region of the outer layer and the second surface of the fastening member were measured. These measurements were performed according to the methods described above. The measurement results are shown in Table 1.

[0157] [Adhesion between the outer layer and the fastening components]

[0158] The adhesion between the outer sheet and the fastening component of each embodiment and comparative example was evaluated using the following method. First, an adhesive (a general hot melt adhesive based on rubber (styrene-butadiene)) pre-coated on the release paper was used at an amount of 20 g / m². 2 The transfer is made to the second side (adhesive side) of the fastener, and the fastener is placed on the flat fiber area R of the outer layer with the adhesive side facing down. Next, a 1 kg roller is rolled back and forth on the fastener three times to secure it to the outer layer. Then, a test piece with a width of 3 cm and a length of 3 cm is cut from the adhesive portion of the fastener and the outer layer. The edge of the outer layer in this test piece is clamped and connected to a push-pull force gauge (RX-20, manufactured by AIKOH ENGINEERING). The push-pull force gauge is then pulled until the fastener peels off from the outer layer, and the peel strength between the fastener and the outer layer is measured. Finally, the adhesion between the outer layer and the fastener is evaluated according to the following standards.

[0159] A: Peel strength is above 0.4N.

[0160] B: Peel strength is less than 0.4N.

[0161] From the perspective of preventing the effects of sheet breakage, in the above evaluation of adhesion, the fasteners and the outer sheet are bonded with an adhesion strength lower than the actual adhesion strength in the diaper. A peel strength of 0.4 N or higher is considered an indicator of sufficient adhesion between the outer sheet and the fasteners. The evaluation results are shown in Table 1.

[0162] [The bonding force between the hook and loop fastener]

[0163] For the composite components of each embodiment and comparative example, the bonding force between the hook-and-loop fastener 7 and the fastening member 6 was evaluated using the following method. The hook-and-loop fastener 7 was a "Merries Sarasara Air Through" type S-size belt manufactured by Kao Corporation. The hook-and-loop fastener 7 was placed on the fastening member of the composite component, and a 1kg roller was applied back and forth three times to fasten it. Next, the end edge of the hook-and-loop fastener was clamped and connected to a push-pull force gauge (RX-20, manufactured by AIKOH ENGINEERING). Then, the push-pull force gauge was pulled until the hook-and-loop fastener detached from the fastening member, and the bonding strength between the hook-and-loop fastener and the fastening member was measured. The bonding force between the hook-and-loop fastener and the fastening member was evaluated using the following criteria. A bonding strength of 2.0N or higher is considered sufficient for a bonding force between the hook-and-loop fastener and the fastening member. The evaluation results are shown in Table 1.

[0164] A: The bonding strength is above 2.0N.

[0165] B: Bond strength is less than 2.0N.

[0166] [Table 1]

[0167]

[0168] As shown in Table 1, in each embodiment, the peel strength between the outer layer and the fastening component is 0.4 N or more, and the bonding strength between the hook-and-loop fastener and the fastening component is 2.0 N or more. This result indicates that the composite components of each embodiment maintain excellent adhesion between the outer layer and the fastening component while ensuring strong bonding between the hook-and-loop fastener and the fastening component. In each embodiment, even without increasing the amount of adhesive used, the adhesion between the outer layer and the fastening component is excellent, thus maintaining a good feel for the outer layer. On the other hand, in each comparative example, one or both of the evaluations for the adhesion between the outer layer and the fastening component and the bonding strength between the hook-and-loop fastener and the fastening component are low.

[0169] Industrial availability

[0170] The absorbent article according to the present invention can ensure the bonding force between the hook and loop fasteners while also ensuring the adhesion of the fasteners on the outer surface of the absorbent article and the feel of the absorbent article.

Claims

1. An absorbent article having a longitudinal direction corresponding to the wearer's front-back direction and a transverse direction orthogonal to the longitudinal direction, and having a crotch portion disposed at the wearer's groin area and a ventral and dorsal portion extending forward and backward toward the crotch portion, and comprising: Fastening straps are provided on both sides of the back side along the longitudinal direction; The absorbent article is characterized by a fastening component located on the non-skin-facing side of the ventral portion for fastening with a buckle strap. The outer sheet forming the non-skin-facing side of the ventral portion has a region containing flat fibers on at least one surface of the non-skin-facing side. The fastening component has a first side for fastening the hook and loop fastener and a second side opposite to the first side, the second side having a higher surface contact area ratio than the first side, and the second side being bonded to the region containing flat fibers.

2. The absorbent article as claimed in claim 1, characterized in that: The presence rate of the flat fibers in the region containing flat fibers is more than 60%.

3. The absorbent article as described in claim 1 or 2, characterized in that: When the surface contact area ratio of the flat fiber region in the outer layer is set as S1, and the surface contact area ratio of the second surface in the fastening member is set as S2, the ratio of S2 to S1, S2 / S1, is 0.7 or more and 1.4 or less.

4. The absorbent article as described in claim 1 or 2, characterized in that: When the surface contact area ratio of the first surface in the fastening component is set to S3 and the surface contact area ratio of the second surface in the fastening component is set to S2, the ratio of S2 to S3, S2 / S3, is 1.4 or more and 10 or less.

5. The absorbent article as described in claim 1 or 2, characterized in that: The surface contact area ratio of the flat fiber region of the outer layer is 70% or more.

6. The absorbent article as claimed in claim 1 or 2, characterized in that: The surface contact area ratio of the flat fiber region of the outer layer is more than 70% and less than 100%.

7. The absorbent article as claimed in claim 1 or 2, characterized in that: The surface contact area ratio of the second side of the fastening component is 70% or more.

8. The absorbent article as claimed in claim 1 or 2, characterized in that: The surface contact area ratio of the second side of the fastening component is more than 80% and less than 100%.

9. The absorbent article as claimed in claim 1 or 2, characterized in that: The surface contact area ratio of the first surface of the fastening component is less than 50%.

10. The absorbent article as claimed in claim 1 or 2, characterized in that: The surface contact area ratio of the first surface of the fastening component is more than 10% and less than 50%.

11. The absorbent article as claimed in claim 1 or 2, characterized in that: The average coefficient of friction (MIU) of the flat fiber region and the second surface is below 0.

2.

12. The absorbent article as claimed in claim 1 or 2, characterized in that: The average deviation (MMD) of the friction coefficients of the region containing flat fibers and the second surface is less than 0.

008.

13. The absorbent article as claimed in claim 1 or 2, characterized in that: An adhesion enhancer is applied to the area containing flat fibers or the second surface.

14. The absorbent article as claimed in claim 1 or 2, characterized in that: The amount of adhesive used to bond the outer layer and the fastening component is 10 g / m. 2 Above and 30g / m 2 the following.

15. The absorbent article as claimed in claim 1 or 2, characterized in that: The fastening component has a stacked structure consisting of a layer forming the first surface and a layer forming the second surface.

16. The absorbent article as claimed in claim 15, characterized in that: The basis weight of the layer forming the second surface is 5 g / m². 2 Above and 35g / m 2 the following.

17. The absorbent article as claimed in claim 1 or 2, characterized in that: The elastic members for forming leg folds are respectively arranged in an elongated state on both sides of the absorbent article along the longitudinal direction. The fastening component does not overlap with the elastic component that forms the leg folds when viewed from above.

18. The absorbent article as claimed in claim 17, characterized in that: The distance between the elastic member for forming leg folds and the fastening member in the longitudinal direction is more than 10 mm.

19. The absorbent article as claimed in claim 1 or 2, characterized in that: The absorbent body containing the absorbent has a pair of leak-proof flanges on both sides along the longitudinal direction. The fastening component does not overlap with the telescopic area of ​​the leak-proof flange when viewed from above.

20. The absorbent article as claimed in claim 19, characterized in that: The fastening component does not overlap with the stretchable portion generated by the elastic component forming the flange of the leak-proof flange.

21. The absorbent article as claimed in claim 19, characterized in that: The leak-proof gusset has: a base end, which forms an upright end facing the wearer's skin; a free end; and a folded portion extending longitudinally between the base end and the free end. It also includes: a first upright portion located between the base end portion and the bent portion; and a second upright portion located between the bent portion and the free end portion. The second upright portion extends laterally outward.

22. The absorbent article as claimed in claim 21, characterized in that: The leak-proof flange includes multiple elastic components for flange formation in the second upright portion.

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