JP7008085B2 - Disposable diapers - Google Patents

Description

The present invention relates to disposable diapers and sweat-absorbing sheets used for disposable diapers.

Conventionally, disposable diapers have been known in which a sheet or the like for absorbing sweat is provided on the surface of the disposable diaper that comes into contact with the skin to effectively prevent the occurrence of eczema, heat rash, rash, etc. (for example, Patent Document 1).

In Patent Document 1, in order to improve the moisture absorption performance as well as the sweat absorption performance, a strip-shaped sweat absorption / release sheet long in the width direction of the diaper is hot-melted at the upper end portion on the back side of the diaper or the upper end portion on the ventral side of the diaper. Disposable diapers that are glued together are disclosed. Further, in Patent Document 1, in order to diffuse sweat in the vertical direction of the diaper, the constituent fibers of the sweat-absorbing / moisture-absorbing sheet are oriented in the vertical direction of the diaper, and the sweat-absorbing / moisture-absorbing sheet is made into a diaper by the hot melt adhesive. It is described that fixed portions and non-fixed portions fixed to the inner surface are alternately provided in the width direction.

Japanese Unexamined Patent Publication No. 2009-82482

The present invention comprises an absorbent body including a liquid-retaining absorber and a surface sheet arranged on the skin contact surface side of the absorber, and the absorbent body arranged on the non-skin contact surface side of the absorbent body. It is a disposable diaper provided with an exterior body for fixing the sex body. The disposable diaper has a ventral portion located on the ventral side of the wearer, a dorsal portion located on the dorsal side, and a crotch portion located between the ventral portion and the dorsal portion. The exterior body has a sweat absorbing region on the skin contact surface of the dorsal side or the ventral side. The sweat-absorbing region has a hydrophobic layer having hydrophobic fibers and arranged on the skin contact surface side of the sweat-absorbing region, and a hydrophilic fiber adjacent to the non-skin contact surface side of the hydrophobic layer. It is formed by joining the hydrophobic layer and the hydrophilic layer with a hot melt adhesive. The joint portion joined with the hot melt adhesive has a first joint portion extending in a direction intersecting the orientation direction of the hydrophilic fibers and intermittently arranged in the orientation direction. The contact angle of water with respect to the joint is 90 degrees or more.

Further, in the present invention, a hydrophobic layer having hydrophobic fibers and arranged on the skin contact surface side and a hydrophobic layer having hydrophilic fibers and arranged adjacent to the non-skin contact surface side of the hydrophobic layer are arranged adjacent to each other. It is a sweat-absorbing sheet for disposable diapers formed by joining the hydrophobic layer and the hydrophilic layer with a hot melt adhesive, including the hydrophilic layer. The hot melt adhesive joint has a first joint that extends in a direction intersecting the orientation direction of the hydrophilic fibers and is intermittently arranged in the orientation direction. The contact angle of water with respect to the joint is 90 degrees or more.

FIG. 1 is a perspective view schematically showing a pants-type disposable diaper, which is an embodiment of the disposable diaper of the present invention. FIG. 2 is a developed plan view schematically showing the skin contact surface side (inner surface side) of the diaper shown in FIG. 1 in the expanded and extended state. FIG. 3 is a vertical cross-sectional view schematically showing a cross section taken along the line III-III (cross section along the vertical direction) of FIG. FIG. 4 is a cross-sectional view schematically showing a cross section of the sweat-absorbing region of the diaper shown in FIG. 1 along the lateral direction. FIG. 5 is a plan view schematically showing a surface of the hydrophilic layer constituting the sweat-absorbing region of the diaper shown in FIG. 1 facing the hydrophobic layer. FIG. 6 is a plan view schematically showing a non-skin contact surface which is a surface opposite to the surface facing the hydrophobic layer in the hydrophilic layer constituting the sweat absorbing region of the diaper shown in FIG. 1. FIG. 7 is a vertical cross-sectional view schematically showing an enlarged vertical end (longitudinal end on the dorsal side) of the diaper according to another embodiment of the disposable diaper of the present invention (corresponding to FIG. 3). Is. FIG. 8 is a vertical cross-sectional view schematically showing an enlarged vertical end (longitudinal end on the dorsal side) of the diaper according to another embodiment of the disposable diaper of the present invention (corresponding to FIG. 3 ). Is. FIG. 9 is a vertical cross-sectional view schematically showing an enlarged vertical end portion (longitudinal end portion on the dorsal side) in the diaper of another embodiment of the disposable diaper of the present invention (corresponding to FIG. 3 ). ).

Detailed description of the invention

Like the diaper described in Patent Document 1, the constituent fibers of the sweat-absorbing and moisture-absorbing sheet are oriented in the vertical direction of the diaper, and the fixed portion and the non-fixed portion of the hot melt adhesive are alternately provided in the width direction of the diaper. Although the sweat can be diffused in the vertical direction, the sweat cannot be efficiently diffused in the vertical direction and the surface direction in the width direction, and it is difficult to improve the dry feeling.

The present invention relates to a disposable diaper that can efficiently diffuse sweat and improve a dry feeling, and a sweat-absorbing sheet for disposable diapers.

Hereinafter, the present invention will be described based on the preferred embodiment thereof with reference to the drawings. 1 to 6 show a pants-type disposable diaper 1, which is an embodiment of the disposable diaper of the present invention. The diaper 1 is provided on the absorbent body 2 including the liquid-retaining absorber 23 and the surface sheet 21 arranged on the skin contact surface side of the absorbent body 23, and on the non-skin contact surface side of the absorbent body 2. It is provided with an exterior body 3 that is arranged and fixes the absorbent body 2. The diaper 1 has a vertical direction X corresponding to a direction extending from the ventral side of the wearer to the dorsal side through the crotch portion, and a lateral direction Y orthogonal to the vertical direction X.

In the present specification, the "skin contact surface" refers to a surface of a disposable diaper or a component thereof (for example, a surface sheet) that is directed toward the wearer's skin when the disposable diaper is worn, that is, relatively to the wearer's skin. The near side, the "non-skin contact surface" is the surface of the disposable diaper or its components that faces the opposite side of the skin when the disposable diaper is worn, that is, the side relatively far from the wearer's skin. be. The term "when worn" as used herein means a state in which the normal proper wearing position, that is, the correct wearing position of the disposable diaper is maintained.

As shown in FIGS. 1 and 2, the diaper 1 has a crotch portion M and a ventral portion F and a dorsal portion R extending from the crotch portion M to the front and back in the vertical direction X. The inseam M is a portion arranged in the crotch portion of the wearer when the diaper 1 is worn. The ventral portion F is a portion located on the ventral side of the wearer in the wearing state of the diaper 1, that is, a portion arranged on the front side in the vertical direction X from the inseam M. The dorsal portion R is a portion located on the dorsal side of the wearer in the wearing state of the diaper 1, that is, a portion arranged on the posterior side of the vertical direction X with respect to the inseam M. The ventral side F and the dorsal side R are waist circumferences arranged around the wearer's waist when the diaper 1 is worn. In other words, the diaper 1 has a waist circumference portion, and the waist circumference portion is divided into a ventral side portion F and a dorsal side portion R.

In the diaper 1, as shown in FIG. 2, the absorbent main body 2 has a vertically long shape in which the vertical direction X is relatively long in a state where the diaper 1 is expanded and extended. The absorbent body 2 includes a liquid-permeable front sheet 21 that forms a skin contact surface, a liquid-impermeable (including water-repellent) back surface sheet 22 that forms a non-skin contact surface, and both of these sheets 21. , 22 is provided with a liquid-retaining absorber 23 interposed therebetween (see FIG. 3). The absorber 23 is arranged over the ventral side F and the dorsal side R. Further, as shown in FIG. 2, leakage-proof cuffs 24 and 24 having elastic members arranged in an extended state in the vertical direction X are provided on both sides of the absorbent main body 2 along the vertical direction X. Specifically, the leak-proof cuff 24 is made of a liquid-impermeable or water-repellent and breathable material, and an elastic member for forming a leak-proof cuff is located near the free end of each leak-proof cuff 24. 25 is arranged in a state of being extended in the vertical direction X. When wearing a diaper, the contraction of the elastic member 25 for forming the leak-proof cuff causes the free end side of the leak-proof cuff 24 to stand up to prevent the outflow of body fluid in the lateral direction Y.

As the front surface sheet 21, the back surface sheet 22, the absorber 23, the leakage-proof cuff 24, and the like, various types conventionally used for absorbent articles such as disposable diapers can be used without particular limitation. For example, as the surface sheet 21, a non-woven fabric having a single-layer or multi-layer structure, a perforated film, or the like can be used. As the back sheet 22, a moisture-permeable resin film or the like can be used. As the absorber 23, one in which an absorbent core composed of absorbent polymer particles and a fiber material is coated with tissue paper can be used. Further, as the leak-proof cuff 24, a water-repellent single-layer or multi-layered non-woven fabric or the like can be used.

As the leak-proof cuff forming elastic member 25, various materials conventionally used for absorbent articles such as disposable diapers can be used without particular limitation, and for example, styrene-butadiene, butadiene, isoprene, neoprene and the like can be used. Examples thereof include synthetic rubber, natural rubber, EVA, elastic polyolefin, polyurethane and the like. As the form of the elastic member, a thread-like (thread rubber or the like) having a rectangular, square, circular, oval, or polygonal cross section, or a string-like (flat rubber or the like) or the like can be preferably used. As the adhesive for fixing each member, various hot melt adhesives and the like conventionally used for absorbent articles such as disposable diapers can be used without particular limitation.

As shown in FIG. 2, the absorbent main body 2 configured as described above has its vertical direction X aligned with the vertical direction X of the diaper 1 in the expanded and extended state, and is in the center of the exterior body 3. It is joined to the part with an adhesive for fixing the main body. As described above, the exterior body 3 is arranged and adhesively fixed to the non-skin contact surface side of the back surface sheet 22 constituting the absorbent body 2 in the thickness direction of the disposable diaper 1. In the diaper 1, both side edges along the vertical direction X in the ventral side F of the exterior body 3 and both side edges along the vertical direction X in the dorsal side R of the exterior body 3 are adhesives, heat seals, and ultrasonic waves. They are joined to each other by a known joining means such as a seal, and as shown in FIG. 1, a pair of side seal portions S and S, a waist opening WH through which the wearer's body is passed, and the wearer's lower limbs pass through. A pair of leg openings LH, LH to be formed is formed. As the main body fixing adhesive for fixing the exterior body 3 and the absorbent main body 2, various hot melt adhesives and the like conventionally used for absorbent articles such as disposable diapers can be used without particular limitation.

As shown in FIG. 2, the above-mentioned "expanded and extended state" means that the side seal portion S is peeled off to put the diaper 1 in the unfolded state, and the diaper 1 in the unfolded state is the elastic member of each part. It means a state in which it is stretched and expanded to the design dimension (the same as the dimension when it is expanded in a plane with the influence of the elastic member completely excluded).

The exterior body 3 forms the outer shape of the diaper 1 in the expanded and extended state as shown in FIG. 2, and the peripheral edge of the exterior body 3 is the contour line of the diaper 1 in that state, that is, the ventral portion F, the inseam M, and the crotch portion M. The contour lines of each of the dorsal portions R are formed. As shown in FIG. 2, the exterior body 3 has a rectangular shape in the ventral portion F and the dorsal portion R in which the length in the lateral direction Y is longer than that in the vertical direction X, and the ventral portion F and the dorsal portion are formed. In the crotch portion M located between the crotch portion M, both side edges of the exterior body 3 along the vertical direction X, that is, a pair of leg edge portions LS and LS are curved in a convex arc shape toward the center of the lateral direction Y. In a plan view as shown in FIG. 2, the central region of the vertical direction X has an hourglass shape constricted inward in the horizontal direction Y.

As shown in FIGS. 2 to 3, the exterior body 3 has a sweat absorbing region KT on its skin contact surface. The sweat-absorbing region KT has a hydrophobic layer 4 having hydrophobic fibers and arranged on the skin contact surface side of the sweat-absorbing region KT, and a hydrophilic fiber on the non-skin contact surface side of the hydrophobic layer 4. It includes a hydrophilic layer 5 arranged adjacent to each other, and is formed by joining the hydrophobic layer 4 and the hydrophilic layer 5 with a hot melt adhesive. The sweat-absorbing region KT is arranged on the ventral side F or the dorsal side R, preferably at least on the skin contact surface of the dorsal side R, and in the diaper 1 shown in FIG. 2, the ventral side portion. It is arranged in each of F and the dorsal part R. Specifically, the sweat absorbing region KT is formed at a position including at least an end flap located outside the vertical direction X with respect to the front and rear end portions 2E and 2E of the vertical direction X of the absorbent body 2. .. As shown in FIG. 3, the exterior body 3 includes an outer layer sheet 31 that forms an outer surface of the diaper 1, that is, a non-skin contact surface in a worn state, and an inner layer sheet 32 that is arranged to face the skin contact surface of the outer layer sheet 31. It is composed of the laminated body of. In the wearing state of the diaper 1, the outer layer sheet 31 is located on the side far from the wearer's body to form the non-skin contact surface (outer surface) of the diaper 1, and the inner layer sheet 32 is on the side closer to the wearer's body. Positioned to form the skin contact surface (inner surface) of the diaper 1.
Although the dorsal portion R is enlarged and not shown in FIG. 3, the ventral portion F is also configured in the same manner as the dorsal portion R, and unless otherwise specified, the ventral portion F is also configured in the same manner as the dorsal portion R. As for the ventral portion F, the description of the dorsal portion R is appropriately applied.

As shown in FIG. 3, the sweat-absorbing region KT is configured by overlapping a plurality of sheets. In the diaper 1, the outer layer sheet 31 and the inner layer sheet 32 constituting the exterior body 3 are both formed of hydrophobic sheets. Then, the outer layer sheet 31 is folded back toward the skin contact surface side of the inner layer sheet 32 along the peripheral edge portion of the waist opening WH, and the folded portion 31R thereof is in the vertical direction of the absorber 23 constituting the absorbent body 2. It covers the front and rear ends 23E and 23E of X. In the diaper 1, the exterior body 3 has an outer layer sheet 31 including the folded-back portion 31R, and a sheet member 35 separate from the inner layer sheet 32. The sheet member 35 is a rectangular sheet long in the lateral direction Y, and is a hydrophilic sheet having hydrophilic fibers 51. The hydrophilic sheet member 35 has substantially the same size as the folded-back portion 31R, is arranged between the folded-back portion 31R and the absorbent main body 2, and is covered with the folded-back portion 31R.
In the sweat-absorbing region KT of the diaper 1, the hydrophobic layer 4 is formed by the folded-back portion 31R forming the skin contact surface of the exterior body 3, and the hydrophilic layer 5 is arranged adjacent to the non-skin contact surface of the folded-back portion 31R. It is formed of the formed sheet member 35. The sweat-absorbing region KT is formed by joining the folded-back portion 31R and the sheet member 35 with a joint portion 6 using a hot-melt adhesive.

The hydrophobic fiber of the outer layer sheet 31 including the folded portion 31R does not contain a hydrophilic agent such as a surfactant and has not been hydrophilized, that is, it is essentially a hydrophobic fiber. Is preferable. As the hydrophobic fiber, a fiber made of various thermoplastic resins (heat-fused fiber) can be used. Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides such as nylon 6 and nylon 66; polyacrylic acid, polymethacrylic acid alkyl esters, polyvinyl chloride, polyvinylidene chloride and the like. One of these can be used alone or in combination of two or more. The hydrophobic fiber may be a short fiber or a long fiber. As the hydrophobic fiber, a core-sheath type or side-by-side type composite fiber, a split fiber, a modified cross-section fiber, a heat-shrinkable fiber or the like can also be used. The same applies to the inner layer sheet 32.

In the fiber constituting the hydrophobic layer 4, that is, in the diaper 1, the proportion of the hydrophobic fiber in the fiber constituting the folded portion 31R of the outer layer sheet 31 is less than 50% by mass from the viewpoint of being difficult to adhere to the skin and improving the dry feeling. It is preferably large, more preferably 80% by mass or more, and preferably 100% by mass or less, specifically, more than 50% by mass and preferably 100% by mass or less, and 80% by mass. It is more preferably 100% by mass or less. From the same viewpoint, the basis weight of the hydrophobic layer 4 is preferably 5 g / m ² or more, more preferably 8 g / m ² or more, and preferably 25 g / m ² or less, preferably 20 g. It is more preferably / m ² or less, specifically, 5 g / m ² or more and 25 g / m ² or less, and 8 g / m ² or more and 20 g / m ² or less.

The fibers constituting the hydrophilic layer 5, that is, the hydrophilic fibers 51 contained in the sheet member 35 in the diaper 1, are hydrophobic fibers contained in the folded portion 31R of the outer layer sheet 31 described above and subjected to a hydrophilic treatment. Specifically, for example, hydrophobic fibers kneaded with a hydrophilic agent, hydrophobic fibers having a hydrophilic agent attached to the surface, and the like can be used. In addition, fibers having inherent hydrophilicity, for example, natural or semi-natural fibers such as cellulose fibers can also be used.

The proportion of the hydrophilic fibers in the fibers constituting the hydrophilic layer 5, that is, the fibers constituting the sheet member 35 in the diaper 1, is preferably larger than 50% by mass, preferably 80% by mass, from the viewpoint of easily absorbing the sweat of the wearer. % Or more, more preferably 100% by mass or less, specifically, more than 50% by mass and 100% by mass or less, and 80% by mass or more and 100% by mass or less. Is even more preferable. From the same viewpoint, the basis weight of the hydrophilic layer 5 is preferably 8 g / m ² or more, more preferably 10 g / m ² or more, and more preferably 30 g / m ² or less, and 25 g. It is more preferably 8 g / m ² or more, more preferably 30 g / m ² or less, and further preferably ¹⁰ g / m ² or more and 25 g / m ² or less.

Whether the fiber is hydrophilic or hydrophobic is determined based on the contact angle of the fiber measured by the following contact angle measuring method. Specifically, if the contact angle of the fiber is less than 90 degrees, it is hydrophilic, and if it is 90 degrees or more, it is hydrophobic. The smaller the contact angle of the fiber measured by the following method, the higher the hydrophilicity (lower hydrophobicity), and the larger the contact angle, the lower the hydrophilicity (higher hydrophobicity).

<Measurement method of contact angle>
Set the sheet (nonwoven fabric) to be measured so that the cross section along the thickness direction is the upper surface, and randomly sample multiple fibers in the section from the outermost surface of the sheet to 1/10 of the thickness in the thickness direction of the sheet, and water. Measure the contact angle of. As a measuring device, an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Distilled water is used to measure the contact angle. Set the amount of liquid discharged from the inkjet water droplet discharge unit (Pulse injector CTC-25 manufactured by Cluster Technology Co., Ltd., with a discharge unit hole diameter of 25 μm) to 15 picolitres, and place the water droplet directly above the center of each fiber. Drop. The state of dripping is recorded on a high-speed recording device connected to a horizontally installed camera. From the viewpoint of image analysis later, the recording device is preferably a personal computer incorporating a high-speed capture device. In this measurement, an image is recorded every 17 msec. In the recorded video, the first image of water droplets on the fibers is the attached software FAMAS (software version is 2.6.2, analysis method is droplet method, analysis method is θ / 2, image processing algorithm. Is non-reflective, the image processing image mode is frame, the threshold level is 200, and the curvature is not corrected.) Make a corner. The fiber is cut to a fiber length of about 1 mm, and the fiber is placed on a sample table of a contact angle meter and maintained horizontally. N = 5 contact angles are measured up to one digit after the decimal point, and the average value of the measured values at 10 points in total (rounded to the first digit after the decimal point) is defined as the contact angle. The lower the contact angle, the higher the hydrophilicity. The measurement environment is room temperature 22 ± 2 ° C. and humidity 65 ± 2% RH.

As shown in FIGS. 3 and 4, the sweat absorbing region KT is formed by joining the folded portion 31R of the outer layer sheet 31 which is the hydrophobic layer 4 and the sheet member 35 which is the hydrophilic layer 5 with a hot melt adhesive. ing. The hot melt adhesive joint 6 has a first joint 61 that extends at least in a direction intersecting the orientation direction of the hydrophilic fibers 51 and is intermittently arranged in the orientation direction. In FIG. 3, the hot melt adhesive is formed in a linear shape extending linearly in the X direction, but may be formed in a spiral linear shape, a zigzag linear shape, or an Ω shape. good. As shown in FIGS. 3 and 4, the joint portion 6 is formed on the facing surface 5T of the hydrophilic layer 5 (sheet member 35) with the hydrophobic layer 4 (folded portion 31R of the outer layer sheet 31). In the diaper 1, the joint portion 6 has a first joint portion 61 extending in a direction intersecting the orientation direction of the hydrophilic fibers 51 constituting the sheet member 35, and the first joint portion 61 is hydrophilic. The fibers 51 are arranged intermittently in the orientation direction. The orientation direction of the hydrophilic fiber 51 is measured by the following method for measuring the orientation direction of the fiber.

<Measuring method of fiber orientation direction>
Using a scanning electron microscope JCM-5100 manufactured by JEOL Ltd., for example, the sheet member 35, which is the hydrophilic layer 5, is placed stationary so that the thickness direction is up and down, and the direction is perpendicular to the measurement surface of the sheet. Print an image taken from the above (adjusted to a magnification that can measure 10 or more fibers: 100 to 300 times), and trace the fibers on a transparent PET sheet. The image is taken into a personal computer, and the image is binarized by using the nexusNewcube (stand-alone version) image processing software manufactured by Nexus Co., Ltd. Next, the binarized image was Fourier transformed using the Fiber Orientation Analysis 8.13 Single software manufactured by Nexus Co., Ltd., which is a fiber orientation analysis program, to obtain a power spectrum, and the distribution map approximated to an ellipse was obtained. Evaluate the orientation of the fibers.

The width W61 (length in the orientation direction of the hydrophilic fibers 51) (see FIG. 5) of the first joint portion 61 is preferably 0.05 mm from the viewpoint of improving the diffusivity of the sweat absorbed by the sweat absorption region KT. The above is more preferably 0.1 mm or more, preferably 2 mm or less, further preferably 1 mm or less, specifically preferably 0.05 mm or more and 2 mm or less, still more preferably 0.1 mm or more and 1 mm or less. .. The width of the first junction 61 was observed with an optical microscope (VHX-1000 manufactured by KEYENCE), the value of N = 10 was measured to one digit after the decimal point, and the measured values at a total of 10 points were averaged (the first decimal point). Round off to one digit). The measurement environment is room temperature 22 ± 2 ° C. and humidity 65 ± 2% RH.

The distance D61 (see FIG. 5) between the first joints 61 and 61 adjacent to each other in the orientation direction of the hydrophilic fibers 51 is preferably 1 mm or more, more preferably 1 mm or more, from the viewpoint of improving the evaporation property of the sweat absorbed by the sweat absorption region KT. It is preferably 3 mm or more, preferably 15 mm or less, more preferably 10 mm or less, specifically, preferably 1 mm or more and 15 mm or less, still more preferably 3 mm or more and 10 mm or less. The distance between the first joints 61 and 61 was observed with an optical microscope (VHX-1000 manufactured by KEYENCE), the value of N = 10 was measured to one digit after the decimal point, and the measured values at 10 points in total were averaged (values). Rounded to the first digit after the decimal point). The measurement environment is room temperature 22 ± 2 ° C. and humidity 65 ± 2% RH.

The contact angle of water with respect to the joint portion 6 by the hot melt adhesive is 90 degrees or more, preferably 90 degrees or more, preferably 120 degrees or less, more preferably 100 degrees or less, and specifically. It is preferably 90 degrees or more and 120 degrees or less, and more preferably 90 degrees or more and 100 degrees or less . Since the contact angle is 90 degrees or more, the joint portion 6 is hydrophobic. The contact angle of water with respect to the joint portion 6 is measured by the following contact angle measuring method.

<Method of measuring the contact angle of water with respect to the joint 6>
The sheet (nonwoven fabric) having the joint portion 6 to be measured is set so that the cross section along the thickness direction is the upper surface, and a plurality of joint portions 6 on the outermost surface of the sheet are randomly sampled to measure the contact angle of water. .. As a measuring device, an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Distilled water is used to measure the contact angle. The amount of liquid discharged from the inkjet water droplet discharge unit (Pulse injector CTC-25 manufactured by Cluster Technology Co., Ltd., with a discharge unit hole diameter of 25 μm) is set to 15 picolitres, and the water droplets are discharged from the center of each joint portion 6. Drop on top. The state of dripping is recorded on a high-speed recording device connected to a horizontally installed camera. From the viewpoint of image analysis later, the recording device is preferably a personal computer incorporating a high-speed capture device. In this measurement, an image is recorded every 17 msec. In the recorded video, the first image of water droplets dripping on the joint 6 is the attached software FAMAS (software version is 2.6.2, analysis method is droplet method, analysis method is θ / 2 method, image. The processing algorithm is non-reflection, the image processing image mode is frame, the threshold level is 200, and the curvature is not corrected). Calculate and use as the contact angle. For the joint portion, the fiber length having the joint portion is cut to about 1 mm, and the fiber is placed on the sample table of the contact angle meter and maintained horizontally. The contact angle of N = 5 is measured up to one digit after the decimal point, and the average value of the measured values at 10 points in total (rounded to the first digit after the decimal point) is defined as the contact angle. The lower the contact angle, the higher the hydrophilicity. The measurement environment is room temperature 22 ± 2 ° C. and humidity 65 ± 2% RH.

As shown in FIGS. 2 to 4, in the diaper 1, the folded portion 31R of the outer layer sheet 31 including the hydrophobic layer 4 and the sheet member 35 which is the hydrophilic layer 5 are hot-melt bonded to the skin contact surface of the exterior body 3. It has a sweat-absorbing region KT formed by joining with an agent. Therefore, the wearer's sweat absorbed by the sweat-absorbing region KT diffuses along the orientation direction of the hydrophilic fibers 51 of the hydrophilic layer 5. Then, as shown in FIG. 5, the joint portion 6 for joining the hydrophobic layer 4 and the hydrophilic layer 5 of the sweat-absorbing region KT has a first joint portion 61 extending in a direction intersecting the orientation direction of the hydrophilic fibers 51. The first joint portion 61 is intermittently arranged in the orientation direction of the hydrophilic fibers 51. Here, the present inventors have found that the wearer's sweat absorbed in the sweat-absorbing region KT is transferred to the first joint portion 61 even though the first joint portion 61 is formed of the hydrophobic hot melt adhesive. It has been found that the hydrophilic fibers 51 can be diffused along the direction intersecting the orientation direction of the hydrophilic fibers 51. As a result, in the sweat-absorbing region KT of the diaper 1, the wearer's sweat can be diffused in the orientation direction and the crossing direction of the hydrophilic fibers 51, respectively, and the sweat can be efficiently diffused. Then, the sweat diffused in the surface directions of the vertical direction X and the horizontal direction Y is easily evaporated, and the dry feeling is improved. In particular, in the diaper 1, as shown in FIG. 3, since the hydrophilic sheet member 35 is arranged between the hydrophobic folded-back portion 31R and the hydrophobic inner layer sheet 32, the diaper 1 is absorbed by the sweat absorption region KT. Sweat easily evaporates and the dry feeling is improved. That is, the sweat-absorbing region KT is formed by using the sheet member 35, and in the sweat-absorbing region KT, the hydrophobic layer 4 formed by the folded-back portion 31R is arranged on the skin contact surface side of the exterior body 3, and the seat member 35. The formed hydrophilic layer 5 is arranged on the non-skin contact surface side of the exterior body 3. Therefore, the sweat of the wearer can be absorbed by the hydrophilic layer 5 on the non-skin contact surface side of the exterior body 3, and the skin contact surface of the sweat absorption region KT is the hydrophobic layer 4, so that the dry feeling is improved.

In the diaper 1, the joint portion 6 forming the sweat-absorbing region KT is, as shown in FIG. 5, in addition to the first joint portion 61 extending in a direction intersecting the orientation direction of the hydrophilic fibers 51, and further, the hydrophilic fibers. It has a second joint portion 62 extending in the orientation direction of 51 and intermittently arranged in a direction intersecting the orientation direction. That is, the joint portion 6 has a first joint portion 61 and a second joint portion 62 extending in the orientation direction of the hydrophilic fibers 51, and the second joint portion 62 is oriented with the hydrophilic fibers 51. It is arranged intermittently in the direction that intersects the direction. In the sweat-absorbing region KT, the wearer's sweat can be efficiently diffused in the surface directions of the vertical direction X and the horizontal direction Y by the first joint portion 61 and the second joint portion 62.

The width W62 (the length in the direction intersecting the orientation direction of the hydrophilic fibers 51) (see FIG. 5) is preferable for the second joint portion 62 from the viewpoint of improving the diffusivity of the sweat absorbed by the sweat absorption region KT. Is 0.05 mm or more, more preferably 0.1 mm or more, and preferably 2 mm or less, further preferably 1 mm or less, specifically, preferably 0.05 mm or more and 2 mm or less, still more preferably 0.1 mm or more. It is 1 mm or less. The width of the second joint portion 62 is measured in the same manner as the width of the first joint portion 61 described above.

The distance D62 (see FIG. 5) between the second joints 62 and 62 adjacent to each other in the direction intersecting the orientation direction of the hydrophilic fibers 51 is preferably set from the viewpoint of improving the evaporation property of the sweat absorbed by the sweat absorption region KT. It is 1 mm or more, more preferably 3 mm or more, and preferably 25 mm or less, further preferably 20 mm or less, specifically, preferably 1 mm or more and 25 mm or less, still more preferably 3 mm or more and 20 mm or less. The distance between the second joints 62 and 62 is measured in the same manner as the distance between the first joints 61 and 61 described above.

As shown in FIGS. 2 and 3, the exterior body 3 is a plurality of elastic members intermittently arranged in the vertical direction X in a state of being extended in the horizontal direction Y between the outer layer sheet 31 and the inner layer sheet 32. Has 33. Since the exterior body 3 includes a plurality of elastic members 33, the waist expansion / contraction portion G1 and the waist circumference lower expansion / contraction portion G2 are formed. Further, the diaper 1 has a plurality of leg elastic members 34 in an extended state as shown in FIG. 2 between the outer layer sheet 31 and the inner layer sheet 32. The diaper 1 includes a plurality of leg elastic members 34 to form a leg expansion / contraction portion G3. As described above, the diaper 1 has a waist expansion / contraction portion G1, a waist circumference lower expansion / contraction portion G2, and a leg expansion / contraction portion G3.

As shown in FIG. 2, the waist expansion / contraction portion G1 is outward in the vertical direction X from the front and rear end portions 23E, 23E of the absorbent body 23 constituting the absorbent body 2 in the vertical direction X. Is formed in. The position of the waist elastic portion G1 may substantially coincide with the position of the sweat absorbing region KT, and the waist elastic portion G1 may be included in the sweat absorbing region KT. Further, the waist circumference lower expansion / contraction portion G2 is formed in a side flap located between the lower end of the waist expansion / contraction portion G1 in the vertical direction X and the lower end of the side seal portion S in the vertical direction X. Further, the leg expansion / contraction portion G3 is formed on the peripheral edge portion of the leg opening portion LH.

From the viewpoint of further diffusing the wearer's sweat absorbed by the sweat-absorbing region KT in the plane directions of the vertical direction X and the horizontal direction Y, the first joint portion 61 extending in a direction intersecting the orientation direction of the hydrophilic fibers 51, The internal angle formed by the hydrophilic fiber 51 with respect to the orientation direction is preferably 30 degrees or more, more preferably 45 degrees or more, and preferably 90 degrees or less, specifically, 30 degrees. The degree is preferably 90 degrees or more, and more preferably 45 degrees or more and 90 degrees or less. The internal angle formed above is observed with an optical microscope (VHX-1000 manufactured by KEYENCE), the value of N = 10 is measured to one digit after the decimal point, and the measured values at a total of 10 points are averaged (rounded to the first decimal place). ). The measurement environment is room temperature 22 ± 2 ° C. and humidity 65 ± 2% RH.

Hot melt adhesion of the joint 6 having the first joint 61 and the second joint 62 from the viewpoint of diffusing the wearer's sweat absorbed in the sweat absorption region KT in the direction intersecting the orientation direction of the hydrophilic fibers 51. The basis weight of the agent is preferably 4 g / m ² or more, more preferably 6 g / m ² or more, and preferably 40 g / m ² or less, and 30 g / m ² or less. More preferably, it is more preferably 4 g / m ² or more and 40 g / m ² or less, and further preferably 6 g / m ² or more and 30 g / m ² or less. The basis weight of the joint portion 6 is measured by the following method for measuring the basis weight of the joint portion 6.

[Method of measuring the basis weight of the hot melt adhesive of the joint 6]
In the sweat-absorbing region KT of the dorsal side R or the ventral side F, the hydrophobic layer 4 (folded portion 31R of the outer layer sheet 31) and the hydrophilic layer 5 (sheet member 35) bonded with the hot melt adhesive are formed in the vertical direction X. It is cut into a rectangular shape of 50 mm × 100 mm in the lateral direction Y, and the weight (WT1) and area (SQ) of the cut pieces are measured. Then, the section was immersed in butyl acetate, shaken with tweezers for 3 minutes, taken out on a metal tray, allowed to stand in a ventilated fume hood for 48 hours, and the weight of the section after air drying (WT2) was measured. do. Using these, the basis weight of the joint portion 6 is measured by the following formula.

Basis weight BW of joint 6 = (WT1-WT2) / SQ

From the viewpoint of further diffusing the wearer's sweat absorbed in the sweat-absorbing region KT in the plane directions of the vertical direction X and the horizontal direction Y, the ratio of the coating area of the hot melt adhesive forming the joint portion 6 in the sweat-absorbing region KT is determined. It is preferably 3% or more, more preferably 5% or more, more preferably 30% or less, still more preferably 25% or less, and specifically 3% or more and 30%. It is preferably 5% or more and 25% or less, more preferably 5% or more. From the same viewpoint, the coating area of the hot melt adhesive of the joint portion 6 having in the rectangle of the sweat absorption region KT in the vertical direction X50 mm and the horizontal direction Y100 mm is preferably 150 mm ² or more, and preferably 250 mm ² or more. It is more preferably 1500 mm ² or less, more preferably 1250 mm ² or less, specifically 150 mm ² or more and 1500 mm ² or less, and 250 mm ² or more and 1250 mm ² or less. Is more preferable. The ratio of the coating area of the joint portion 6 and the coating area of the joint portion 6 is measured by the following measuring method.

[Measuring method of the ratio of the coated area of the joint 6 and the coated area of the joint 6]
In the sweat-absorbing region KT, the hydrophobic layer 4 (folded portion 31R of the outer layer sheet 31) and the hydrophilic layer 5 (sheet member 35) bonded with a hot melt adhesive are formed into a rectangular shape of 50 mm in the vertical direction X and 100 mm in the horizontal direction Y. Cut out to (A1) and spray toner. The excess unadhered toner that did not adhere to the joint portion 6 of the cut out section is sucked and removed by a vacuum cleaner. When the coating pattern of the adhesive in the area where the adhesive is applied is so-called solid coating, and the coating shape is a shape such as a rectangle or a square whose area can be easily measured with a ruler or the like. Measures the vertical and horizontal lengths and other dimensions of the area to which the adhesive is applied to calculate the area, and uses this as the adhesive application area (A2). When the adhesive application pattern in the area where the adhesive is applied is spirally applied, etc., the area where the adhesive is applied is tonered using an optical microscope having an image processing function. Measure the area colored by. When observing the portion colored with toner with an optical microscope, an area of 25 mm ² is arbitrarily extracted at 5 points, and the area of the portion colored with toner is calculated in detail by observation and image processing. Using these, the ratio of the coating area of the joint portion 6 is measured by the following formula.
Ratio of coating area of joint 6 = (A2 / A1) × 100

From the viewpoint of diffusing the wearer's sweat absorbed by the sweat-absorbing region KT in the orientation direction of the fibers constituting the hydrophilic layer 5, the interfiber distance between the fibers constituting the hydrophilic layer 5 of the sweat-absorbing region KT is 100 μm or less. It is preferably 80 μm or less, more preferably 9 μm or more, further preferably 15 μm or more, and specifically, 9 μm or more and 100 μm or less, and 15 μm or more and 80 μm. The following is more preferable. The interfiber distance is measured by the following method.

[Measuring method of interfiber distance]
It can be obtained by the following formula (1).

From the viewpoint of further diffusing the wearer's sweat absorbed in the sweat-absorbing region KT in the plane directions of the vertical direction X and the horizontal direction Y, the orientation direction of the hydrophilic fibers 51 of the hydrophilic layer 5 (sheet member 35) and the hydrophobicity. It is preferable that the orientation direction of the hydrophobic fibers of the layer 4 (folded portion 31R of the outer layer sheet 31) is the same. The orientation direction of the hydrophobic fiber is measured by the above-mentioned method for measuring the orientation direction of the fiber. It should be noted that the same direction may be directed in the same direction, and does not have to be exactly the same.

From the viewpoint of further diffusing the wearer's sweat absorbed by the sweat-absorbing region KT in the vertical direction X and the horizontal direction Y, the inner layer sheet 32 is configured in the orientation direction of the fibers constituting the outer layer sheet 31 including the folded-back portion 31R. It is preferable that the orientation direction of the fibers to be formed and the orientation direction of the fibers constituting the separate sheet member 35 are the same. The orientation direction of the fibers of the outer layer sheet 31, the inner layer sheet 32 and the sheet member 35 is measured by the above-described method for measuring the orientation direction of the fibers.

In the diaper 1, as shown in FIG. 3, the sheet member 35, which is the hydrophilic layer 5, has the non-skin contact surface 5H, which is the surface opposite to the surface 5T facing the folded-back portion 31R, which is the hydrophobic layer 4. It is bonded to the inner layer sheet 32, which is a separate layer from the hydrophobic layer 4, with a hot melt adhesive. As shown in FIG. 6, the separate joint portion 7 bonded with the hot melt adhesive extends in a direction intersecting the orientation direction of the hydrophilic fibers 51 of the sheet member 35, and the separate joint portion 7 extends in the crossing direction. Are intermittently arranged in the orientation direction. As described above, since the diaper 1 of the present embodiment includes not only the joint portion 6 forming the sweat absorption region KT but also the separate joint portion 7 for joining the sheet member 35 and the inner layer sheet 32, the sweat absorption region KT is provided. The absorbed sweat of the wearer can be further diffused in the surface directions of the vertical direction X and the horizontal direction Y.

The width W7 (length in the orientation direction of the hydrophilic fibers 51) (see FIG. 6) of the separate joint portion 7 is preferably 0.025 mm or more from the viewpoint of improving the diffusivity of the sweat absorbed by the sweat absorption region KT. More preferably 0.08 mm or more, preferably 1.75 mm or less, still more preferably 0.8 mm or less, specifically, preferably 0.025 mm or more and 1.75 mm or less, still more preferably 0.08 mm. It is 0.8 mm or more and 0.8 mm or less. The width of the separate joint 7 was observed with an optical microscope (VHX-1000 manufactured by KEYENCE), the value of N = 10 was measured to one digit after the decimal point, and the measured values at a total of 10 points were averaged (first decimal point). Rounded to the nearest whole number). The measurement environment is room temperature 22 ± 2 ° C. and humidity 65 ± 2% RH.

The distance D7 (see FIG. 6) between the separate joints 7 and 7 adjacent to each other in the orientation direction of the hydrophilic fibers 51 is preferably 1.2 mm or more from the viewpoint of improving the evaporation property of the sweat absorbed by the sweat absorption region KT. More preferably 3.5 mm or more, preferably 17.5 mm or less, still more preferably 12.5 mm or less, specifically, preferably 1.2 mm or more and 17.5 mm or less, still more preferably 3.5 mm or more. It is 12.5 mm or less. The distance between the separate joints 7 and 7 is observed with an optical microscope (VHX-1000 manufactured by KEYENCE), the value of N = 10 is measured to one digit after the decimal point, and the measured values of a total of 10 points are averaged (decimal point). Round off to the first decimal place). The measurement environment is room temperature 22 ± 2 ° C. and humidity 65 ± 2% RH.

Further, from the viewpoint of facilitating the evaporation of sweat absorbed in the sweat-absorbing region KT and improving the dry feeling, in the diapers 1 shown in FIGS. 1 to 6, the hydrophobic layer of the separate sheet member 35 which is the hydrophilic layer 5 The internal angle formed by the first joint portion 61 extending in the intersecting direction on the facing surface 5T with the folded-back portion 31R and the orientation direction of the hydrophilic fiber 51 is the non-skin contact of the sheet member 35 which is the hydrophilic layer 5. It is preferable that the angle is larger than the internal angle formed by the separate joint portion 7 extending in the intersecting direction on the contact surface 5H and the orientation direction of the hydrophilic fiber 51. Specifically, the internal angle formed by the separate joint portion 7 extending in the direction intersecting the orientation direction of the hydrophilic fiber 51 and the orientation direction of the hydrophilic fiber 51 is preferably 25 degrees or more, preferably 30 degrees. The above is more preferable, and it is preferably 85 degrees or less, specifically, 25 degrees or more and 85 degrees or less, and 30 degrees or more and 85 degrees or less is further preferable. The internal angle formed above is observed with an optical microscope (VHX-1000 manufactured by KEYENCE), the value of N = 10 is measured to one digit after the decimal point, and the measured values at a total of 10 points are averaged (rounded to the first decimal place). ). The measurement environment is room temperature 22 ± 2 ° C. and humidity 65 ± 2% RH.

Further, from the viewpoint of facilitating the evaporation of sweat absorbed in the sweat absorbing region KT and further improving the dry feeling, in the diapers 1 shown in FIGS. 1 to 6, the hydrophobicity of the separate sheet member 35 which is the hydrophilic layer 5 is obtained. The basis weight of the hot melt adhesive of the joint portion 6 on the facing surface 5T with the folded-back portion 31R of the layer 4 is the hot melt of the separate joint portion 7 on the non-skin contact surface 5H of the sheet member 35 which is the hydrophilic layer 5. It is preferably larger than the basis weight of the adhesive. Specifically, the basis weight of the hot melt adhesive of the separate joint portion 7 is preferably 3 g / m ² or more, more preferably 5 g / m ² or more, and 35 g / m ² or less. It is preferably 25 g / m ² or less, more preferably 3 g / m ² or more and 35 g / m ² or less, and 5 g / m ² or more and 25 g / m ² or less. Is even more preferable. The basis weight of the separate joint portion 7 is measured by the following method for measuring the basis weight of the hot melt adhesive of the separate joint portion 7.

[Method for measuring the basis weight of the hot melt adhesive in the separate joint 7]
In the sweat absorbing region KT of the dorsal side R or the ventral side F, the hydrophobic layer 4 (folded portion 31R), the hydrophilic layer 5 (sheet member 35) and the inner layer sheet 32 joined by the hot melt adhesive are combined with the sweat absorbing region KT. In the thickness direction of, the hydrophobic layer 4 (folded portion 31R) and the hydrophilic layer 5 (sheet member 35) are not bonded, and the hydrophilic layer 5 (sheet member 35) and the inner layer sheet 32 are bonded (separate joint portion). Cut out from 7), and measure the weight (WT1) and area (SQ) of the cut out section. Then, the section was immersed in butyl acetate, shaken with tweezers for 3 minutes, taken out on a metal tray, allowed to stand in a ventilated fume hood for 48 hours, and the weight of the section after air drying (WT2) was measured. do. Using these, the basis weight of the separate joint 7 is measured from the following formula.

Basis weight BW of separate joint 7 = (WT1-WT2) / SQ

Further, from the viewpoint of facilitating the evaporation of sweat absorbed in the sweat-absorbing area KT and further improving the dry feeling, in the diapers 1 shown in FIGS. 1 to 6, the hydrophobicity of the separate sheet member 35 which is the hydrophilic layer 5 is obtained. The application area of the hot melt adhesive forming the joint portion 6 on the facing surface 5T with the folded-back portion 31R which is the layer 4 is the separate joint portion 7 on the non-skin contact surface 5H of the sheet member 35 which is the hydrophilic layer 5. It is preferably larger than the coating area of the hot melt adhesive to be formed. The coating area of the separate joint portion 7 having in the rectangle of the sweat absorption region KT in the vertical direction X50 mm and the horizontal direction Y100 mm is preferably 125 mm ² or more, more preferably 200 mm ² or more, and 1250 mm ² or less. It is preferably 1000 mm ² or less, more preferably 125 mm ² or more and 1250 mm ² or less, and further preferably 200 mm ² or more and 1000 mm ² or less. The coating area of the separate joint portion 7 is measured in the same manner as the method for measuring the coating area of the joint portion 6 described above.

7, 8 and 9, respectively, show other embodiments of the present invention. Regarding other embodiments described later, components different from the above-mentioned diaper 1 will be mainly described, and similar components will be designated by the same reference numerals and description thereof will be omitted. The above-mentioned description of the diaper 1 is appropriately applied to the components not particularly described.

In the diaper 1 shown in FIG. 7, the exterior body 3 does not have the folded-back portion 31R and the sheet member 35, but has the outer layer sheet 31 and the inner layer sheet 32. In the diaper 1 shown in FIG. 7, the sweat absorbing region KT is formed by an inner layer sheet 32 in which the hydrophobic layer 4 forms the skin contact surface of the exterior body 3, and the hydrophilic layer 5 is the non-skin contact surface of the exterior body 3. It is formed of the outer layer sheet 31 forming the above. The inner layer sheet 32 is a hydrophobic sheet and has hydrophobic fibers. On the other hand, the outer layer sheet 31 is a hydrophilic sheet and has hydrophilic fibers 51. The sweat-absorbing region KT is formed by joining the hydrophobic inner layer sheet 32 and the hydrophilic outer layer sheet 31 with a joint portion 6 using a hot melt adhesive. The diaper 1 shown in FIG. 7 can have the same effect as the diaper 1 shown in FIGS. 1 to 6 described above.

In the sweat-absorbing region KT of the diaper 1 shown in FIG. 7, the hydrophobic layer 4 formed by the inner layer sheet 32 is arranged on the skin contact surface side of the outer layer 3, and the hydrophilic layer 5 formed by the outer layer sheet 31 is the outer body 3. It is arranged on the non-skin contact surface side of. Therefore, the sweat of the wearer can be absorbed by the hydrophilic layer 5 on the non-skin contact surface side of the exterior body 3, and the skin contact surface of the sweat absorption region KT is the hydrophobic layer 4, so that the dry feeling is improved.

Further, in the sweat-absorbing region KT of the diaper 1 shown in FIG. 7, elasticity in a state of being extended in the lateral direction Y between the hydrophobic layer 4 formed by the inner layer sheet 32 and the hydrophilic layer 5 formed by the outer layer sheet 31. Members 33 are intermittently arranged in the vertical direction X. When the elastic member 33 is arranged between the hydrophobic layer 4 and the hydrophilic layer 5 in this way, the sweat diffused in the surface directions of the vertical direction X and the horizontal direction Y easily evaporates in the sweat absorbing region KT, and a dry feeling is obtained. improves. In particular, in the diaper 1, the stretched elastic member 33 extends in the orientation direction of the hydrophilic fibers 51 and is intermittently arranged in the intersecting direction. Since the folds are generated along the direction in which the sweat intersects the orientation direction of the hydrophilic fibers 51, the sweat can be efficiently diffused in the direction intersecting the orientation direction of the hydrophilic fibers 51.

Further, the exterior body 3 of the diaper 1 shown in FIG. 7 has hydrophobic fibers on the skin contact surface of the exterior body 3 other than the sweat absorbing region KT. Specifically, the inner layer sheet 32 constituting the skin contact surface of the exterior body 3 has hydrophobic fibers even in regions other than the sweat absorbing region KT. Therefore, the skin contact surface does not easily stick to the skin, and the dry feeling is improved.

In the fibers constituting the hydrophobic layer 4, that is, in the diaper 1 shown in FIG. 7, the proportion of the hydrophobic fibers in the fibers constituting the inner layer sheet 32 is less than 50% by mass from the viewpoint of being difficult to adhere to the skin and improving the dry feeling. It is preferably large, more preferably 80% by mass or more, and preferably 100% by mass or less, specifically, more than 50% by mass and preferably 100% by mass or less, and 80% by mass. It is more preferably 100% by mass or less. From the same viewpoint, the basis weight of the hydrophobic layer 4 is preferably 5 g / m ² or more, more preferably 8 g / m ² or more, and preferably 25 g / m ² or less, preferably 20 g. It is more preferably / m ² or less, specifically, 5 g / m ² or more and 25 g / m ² or less, and 8 g / m ² or more and 20 g / m ² or less.

In the diaper 1 shown in FIG. 7, the proportion of the hydrophilic fibers in the fibers constituting the hydrophilic layer 5, that is, the fibers constituting the outer layer sheet 31, may be larger than 50% by mass from the viewpoint of easily absorbing the wearer's sweat. It is preferably 80% by mass or more, more preferably 100% by mass or less, specifically, more than 50% by mass and 100% by mass or less, and 80% by mass or more and 100% by mass. % Or less is more preferable. From the same viewpoint, the basis weight of the hydrophilic layer 5 is preferably 8 g / m ² or more, more preferably 10 g / m ² or more, and more preferably 30 g / m ² or less, and 25 g. It is more preferably 8 g / m ² or more, more preferably 30 g / m ² or less, and further preferably ¹⁰ g / m ² or more and 25 g / m ² or less.

Next, in the diaper 1 shown in FIG. 8, the outer layer sheet 31 and the inner layer sheet 32 constituting the exterior body 3 are both formed of a hydrophobic sheet, similarly to the diapers 1 shown in FIGS. 1 to 6 described above. ing. Then, the outer layer sheet 31 is folded back toward the skin contact surface side of the inner layer sheet 32 along the peripheral edge portion of the waist opening WH, and the folded portion 31R thereof is in the vertical direction of the absorber 23 constituting the absorbent body 2. It covers the front and rear ends 23E and 23E of X. In the diaper 1 shown in FIG. 8, the exterior body 3 has an outer layer sheet 31 including the folded-back portion 31R and a sheet member 35 separate from the inner layer sheet 32. The sheet member 35 is a rectangular sheet that is long in the lateral direction Y, and has a laminated structure of the hydrophobic layer 4 and the hydrophilic layer 5. The sheet member 35 having a laminated structure has substantially the same size as the folded-back portion 31R, is arranged on the skin contact surface of the folded-back portion 31R, the hydrophilic layer 5 side is arranged on the folded-back portion 31R side, and the hydrophobic layer 4 is arranged. Formes a skin contact surface.

In the diaper 1 shown in FIG. 8, the sweat absorbing region KT is a separate body from the outer layer sheet 31 and the inner layer sheet 32 forming the exterior body 3, and the sheet member 35 having a laminated structure of the hydrophobic layer 4 and the hydrophilic layer 5 is provided. Formed using. The diaper 1 shown in FIG. 8 can have the same effect as the diaper 1 shown in FIGS. 1 to 6 described above. Further, since the sheet member 35 having a laminated structure arranged on the skin contact surface of the folded portion 31R is used, it is easy to control the position of the sweat absorption region KT, and the sweat absorption is improved.

In the diaper 1 shown in FIG. 8, the sweat absorbing region KT is formed by using a sheet member 35 made of two composite non-woven fabrics in which the hydrophobic layer 4 and the hydrophilic layer 5 are bonded with a hot melt adhesive. The sheet member 35 made of the composite non-woven fabric is a sweat-absorbing sheet. The sheet member 35, which is a sweat-absorbing sheet, includes a hydrophobic layer 4 arranged on the skin contact surface side and a hydrophilic layer 5 arranged adjacent to the non-skin contact surface side of the hydrophobic layer 4, and is a hydrophobic layer 4. And the hydrophilic layer 5 are joined together with a hot melt adhesive. The joint portion 6 made of the hot melt adhesive has a first joint portion 61 extending in a direction intersecting the orientation direction of the hydrophilic fibers 51 constituting the hydrophilic layer 5 of the sheet member 35, and extends in the intersecting direction. The first joint portion 61 is intermittently arranged in the orientation direction. The sheet member 35 further has a plurality of fusion-bonded fixing portions 8 for fixing the constituent fibers of the hydrophobic layer 4 and the constituent fibers of the hydrophilic layer 5. The fused fixing portion 8 is formed after joining with a hot melt adhesive. The fused fixing portion 8 can be formed by using, for example, an ultrasonic seal or a laser. The sheet member 35, which is a sweat-absorbing sheet, is joined to the skin contact surface of the folded-back portion 31R via a separate joint portion 7 (see FIG. 8). The separate joint portion 7 is formed of a hot melt adhesive and extends in a direction intersecting the orientation direction of the hydrophilic fibers 51 constituting the hydrophilic layer 5 of the sheet member 35, and the separate joint portion extends in the crossing direction. The portions 7 are arranged intermittently in the orientation direction. Basically, the fused fixing portions 8 may be evenly dispersed or unevenly dispersed as long as the form of the nonwoven fabric can be maintained. In the diaper 1 shown in FIG. 8, a sweat-absorbing region KT is formed by using a separate sheet member 35 having a fusion-bonded fixing portion 8. Therefore, the sweat of the wearer can be absorbed into the sweat-absorbing region KT via the fusion-bonding fixing portion 8, and the sweat absorbed by the sweat-absorbing region KT can be further diffused in the surface directions of the vertical direction X and the horizontal direction Y.

When the sweat absorbing region KT is formed by the sheet member 35 which is a sweat absorbing sheet as in the diaper 1 shown in FIG. 8, the sheet member 35 has a high sweat absorbing power and the absorbed sweat is easily diffused. The total basis weight is preferably 50 g / m ² or less, more preferably 40 g / m ² or less, and preferably 10 g / m ² or more, and 20 g / m ² or more. More preferably, it is more preferably 10 g / m ² or more and 50 g / m ² or less, and further preferably 20 g / m ² or more and 40 g / m ² or less.

When the sweat-absorbing region KT is composed of a sheet member 35 which is a sweat-absorbing sheet as in the diaper 1 shown in FIG. 8, from the viewpoint of sweat absorption, the entire area of the fusion-bonded fixing portion 8 with respect to the entire area of the sweat-absorbing region KT The area ratio is preferably 15% or less, more preferably 10% or less, more preferably 1% or more, still more preferably 3% or more, specifically, specifically. It is preferably 1% or more and 15% or less, and more preferably 3% or more and 10% or less.
From the same viewpoint, the area of one of the fused fixing portions 8 is preferably 5 mm ² or less, more preferably 4 mm ² or less, and 0.5 mm ² or more. It is more preferably 0.75 mm ² or more, more preferably 0.5 mm ² or more and 5 mm ² or less, and further preferably 0.75 mm ² or more and 4 mm ² or less.

Further, in the diaper 1 shown in FIG. 8, from the viewpoint of further expressing the dry feeling of the skin, a plurality of penetrations penetrating the hydrophobic layer 4 and the hydrophilic layer 5 of the sheet member 35 which is the sweat absorbing sheet in the sweat absorbing region KT. It is preferable that the holes are arranged. The through hole may be formed in the central portion of the fusion-bonded fixing portion 8 or may be formed in a portion other than the fusion-bonded fixing portion 8. When the through hole is formed in the central portion of the fusion-bonded fixing portion 8, when the fusion-bonding fixing portion 8 employs an ultrasonic seal, a laser, or the like, compared with the case where the fusion-bonding fixing portion 8 is simply formed. It can be formed by increasing the output or lengthening the melting time. When the through hole is formed in a portion other than the fusion-bonded fixing portion 8, it can be formed by using a pin embossing device or the like. From the viewpoint that the sweat absorbed in the sweat absorbing region KT easily evaporates through the through hole, the through hole is arranged in a portion other than the fusion fixing portion 8 so as not to overlap with the fusion fixing portion 8. Is preferable. The area of the through hole is preferably 0.5 mm ² or more and 5 mm ² or less, and more preferably 0.75 mm ² or more and 4 mm ² or less.

Next, in the diaper 1 shown in FIG. 9, the outer layer sheet 31 constituting the exterior body 3 is formed of a hydrophobic sheet, and the inner layer sheet 32 is formed of a hydrophilic sheet. In the diaper 1 shown in FIG. 9, the exterior body 3 has a sheet member 35 that is separate from the outer layer sheet 31 and the inner layer sheet 32. The sheet member 35 is a rectangular sheet long in the lateral direction Y, and is a hydrophobic sheet. The hydrophobic sheet member 35 covers the front-rear end portions 23E and 23E of the absorber 23 constituting the absorbent body 2 in the vertical direction X. In the diaper 1 shown in FIG. 9, in the sweat absorbing region KT, the hydrophilic layer 5 is formed of the inner layer sheet 32, and the hydrophobic layer 4 is formed of the sheet member 35. The sweat absorption region KT is formed by joining the sheet member 35 and the inner layer sheet 32 with a joint portion 6 using a hot melt adhesive. The diaper 1 shown in FIG. 9 can have the same effect as the diaper 1 shown in FIGS. 1 to 6 described above. Further, since the hydrophobic sheet member 35 is arranged on the skin contact surface, even if the sweat absorbing region KT absorbs sweat, the sweat absorbing region does not easily stick to the skin.

The disposable diaper of the present invention is not limited to the diaper 1 shown in FIGS. 1 to 6 above, the diaper 1 shown in FIG. 7, the diaper 1 shown in FIG. 8, and the diaper 1 shown in FIG. It is possible. In addition, the constituent requirements of each of the above-mentioned diapers 1 can be appropriately combined and implemented as long as the gist of the present invention is not impaired.

For example, in the diaper 1 shown in FIGS. 1 to 6 described above, at least one of the outer layer sheet 31 and the inner layer sheet 32 may be formed of a stretchable non-woven fabric having elasticity in the lateral direction Y. When it is made of elastic non-woven fabric, it does not have to have the elastic member 33. Similarly, in the diaper 1 shown in FIG. 7 above, at least one of the outer layer sheet 31 and the inner layer sheet 32 constituting the sweat absorbing region KT may be formed of a stretchable nonwoven fabric having elasticity in the lateral direction Y. When formed of the stretchable non-woven fabric, it is not necessary to have a plurality of elastic members 33 in a laterally extended state arranged between the outer layer sheet 31 and the inner layer sheet 32. When the elastic member 33 is not provided, the stretchable nonwoven fabric elastic in the lateral direction Y is used for at least one of the inner layer sheet 32 which is the hydrophobic layer 4 and the outer layer sheet 31 which is the hydrophilic layer 5 to provide the sweat absorption region KT. Once formed, the skin and the inner layer sheet 32 are in close contact with each other in the sweat-absorbing region KT, and sweat can be absorbed without gaps.

Examples of the stretchable nonwoven fabric that can be used include a stretchable sheet in which an stretchable fiber layer is integrated on both sides or one side of the elastic fiber layer, and the elastic fiber layer and the stretchable fiber layer are integrated. Examples of the method include a method of laminating both and entangled with water flow, a method of entwining fibers by air through and the like, a method of heat embossing, an adhesive, a method of joining by ultrasonic waves and the like. The term "stretchability" means a property of being expandable in a predetermined direction and contracting when the extension is released.

Further, in the diaper 1 shown in FIG. 7 above, the hydrophilic layer 5 constituting the sweat absorbing region KT is formed of the outer layer sheet 31 of the exterior body 3. The outer layer sheet 31 is formed of one hydrophilic sheet having hydrophilic fibers 51, but only the portion constituting the sweat absorbing region KT may be used as the hydrophilic sheet. Specifically, only the portion of the outer layer sheet 31 located in the sweat absorbing region KT of the ventral side F and the dorsal side R is made of a hydrophilic sheet, and the portion of the outer layer sheet 31 located in the inseam M is formed. A form consisting of a hydrophobic sheet can be mentioned. Further, a hydrophobic sheet is used as the outer layer sheet 31, and only the portions located in the sweat absorbing regions KT of the ventral side F and the dorsal side R are hydrophilized with a hydrophilic agent such as a surfactant. May be.

Further, in the diapers 1 shown in FIGS. 1 to 6 described above, as shown in FIG. 2, the exterior body 3 has a continuous shape extending over the ventral side F, the inseam M, and the dorsal side R. Instead of this, the exterior body 3 may be divided into a ventral seat member and a dorsal seat member, and the absorbent main body 2 may be bridged and fixed to both seat members.
Further, the disposable diaper of the present invention is not limited to the pants-type disposable diaper such as the above-mentioned diaper 1, and can be applied to, for example, a deployable disposable diaper.

The following disposable diapers are further disclosed with respect to the above-described embodiment.

<1>
An absorbent body including a liquid-retaining absorber and a surface sheet arranged on the skin contact surface side of the absorber, and an absorbent body arranged on the non-skin contact surface side of the absorbent body to fix the absorbent body. A disposable diaper comprising an exterior body, wherein the disposable diaper is a ventral portion located on the ventral side of the wearer, a dorsal portion located on the dorsal side, and the ventral portion and the dorsal portion. It has a crotch portion located between them, and the exterior body has a sweat-absorbing region on the skin contact surface of the dorsal side or the ventral side, and the sweat-absorbing region has hydrophobic fibers. A hydrophobic layer having and arranged on the skin contact surface side of the sweat absorbing region and a hydrophilic layer having hydrophilic fibers and arranged adjacent to the non-skin contact surface side of the hydrophobic layer are included. , The hydrophobic layer and the hydrophilic layer are joined by a hot melt adhesive, and the joint portion joined by the hot melt adhesive extends in a direction intersecting the orientation direction of the hydrophilic fibers. A disposable diaper having a first joint portion intermittently arranged in the orientation direction and having a water contact angle with respect to the joint portion of 90 degrees or more.
<2>
The disposable diaper according to <1>, wherein the proportion of the hydrophilic fibers in the fibers constituting the hydrophilic layer is greater than 50% by mass and 100% by mass or less.
<3>
The disposable diaper according to <1> or <2>, wherein the weight ratio of the hydrophobic fibers to the fibers constituting the hydrophobic layer is more than 50% by mass and 100% by mass or less.
<4>
The disposable diaper according to any one of <1> to <3>, wherein the internal angle formed by the extending direction of the first joint and the orientation direction of the hydrophilic fibers is 30 degrees or more and 90 degrees or less. ..
<5>
The disposable diaper according to any one of <1> to <4>, wherein the hot melt adhesive has a basis weight of 4 g / m ² or more and 40 g / m ² or less in the first joint portion.
<6>
The disposable diaper according to any one of <1> to <5>, wherein the ratio of the coating area of the hot melt adhesive in the sweat absorbing region is 3% or more and 30% or less.
<7>
The disposable diaper according to any one of <1> to <6>, wherein the interfiber distance between the fibers constituting the hydrophilic layer is 9 μm or more and 100 μm or less.
<8>
The disposable diaper according to any one of <1> to <7>, wherein the orientation direction of the hydrophilic fibers and the orientation direction of the hydrophobic fibers are the same.
<9>
The disposable diaper according to any one of <1> to <8>, wherein a plurality of fusion-bonded fixing portions formed by fixing the hydrophobic layer and the hydrophilic layer are formed in the sweat-absorbing region.
<10>
The disposable diaper according to any one of <1> to <9>, wherein a plurality of through holes penetrating the hydrophobic layer and the hydrophilic layer are arranged in the sweat absorbing region.

<11>
The joint portion further has a second joint portion extending in the orientation direction of the hydrophilic fibers and intermittently arranged in a direction intersecting the orientation direction, said <1> to <10>. Disposable diaper according to any one of 1.
<12>
The hydrophilic layer is bonded to a layer different from the hydrophobic layer with a hot melt adhesive on a non-skin contact surface which is a surface opposite to the surface facing the hydrophobic layer, and the hot melt adhesive is used. The above-mentioned <1> to <11>, wherein the separate joint portion joined in 1 extends in a direction intersecting the orientation direction of the hydrophilic fibers and is intermittently arranged in the orientation direction. Disposable diapers.
<13>
The internal angle formed by the first joint portion on the surface of the hydrophilic layer facing the hydrophobic layer and the orientation direction of the hydrophilic fibers is the same as the separate joint portion on the non-skin contact surface of the hydrophilic layer. The disposable diaper according to <12> above, which is larger than the internal angle formed by the orientation direction of the sex fibers.
<14>
The basis weight of the hot melt adhesive at the joint portion on the surface of the hydrophilic layer facing the hydrophobic layer is the basis weight of the hot melt adhesive at the separate joint portion on the non-skin contact surface of the hydrophilic layer. The disposable diaper according to <12> or <13>, which is larger than the above.
<15>
The coating area of the hot melt adhesive forming the joint portion on the surface of the hydrophilic layer facing the hydrophobic layer is the hot melt adhesive forming the separate joint portion on the non-skin contact surface of the hydrophilic layer. The disposable diaper according to any one of <12> to <14>, which is larger than the coating area of the agent.
<16>
The hydrophobic layer is arranged on the skin contact surface side of the exterior body, and the hydrophilic layer is arranged on the non-skin contact surface side of the exterior body, in any one of <1> to <15>. The listed disposable diapers.
<17>
The disposable diaper according to any one of <1> to <16>, wherein the outer body has hydrophobic fibers other than the sweat absorbing region.
<18>
The sweat-absorbing region is formed by using a sheet member separate from the outer layer sheet forming the non-skin contact surface of the exterior body and the inner layer sheet arranged to face the skin contact surface of the outer layer sheet. The disposable diaper according to any one of <1> to <17>.
<19>
The disposable according to <18>, wherein the orientation direction of the fibers constituting the outer layer sheet, the orientation direction of the fibers constituting the inner layer sheet, and the orientation direction of the fibers constituting the sheet member are all the same direction. Diapers.
<20>
The outer layer sheet and the inner layer sheet are hydrophobic, the sheet member is hydrophilic, the outer layer sheet is folded back toward the skin contact surface side of the inner layer sheet, and the folded portion thereof forms the absorbent body. The sheet member covers the front and rear ends in the vertical direction of the constituent absorber, and the sheet member is arranged adjacent to the non-skin contact surface of the folded portion of the outer layer sheet, and the folded portion of the outer layer sheet is arranged adjacent to the non-skin contact surface. The disposable diaper according to <18> or <19>, wherein the hydrophobic layer of the sweat-absorbing region is formed, and the sheet member forms the hydrophilic layer of the sweat-absorbing region.

<21>
The sheet member is joined to the inner layer sheet with the hot melt adhesive at a separate joint portion on a non-skin contact surface which is a surface opposite to the surface facing the folded portion, and the separate joint portion. The width (the length in the orientation direction of the hydrophilic fiber) is preferably 0.025 mm or more, more preferably 0.08 mm or more, and 1.75 mm or less. The disposable diaper according to the above <20>, preferably 0.8 mm or less.
<22>
The distance between the separate joints adjacent to each other in the orientation direction of the hydrophilic fibers is preferably 1.2 mm or more, more preferably 3.5 mm or more, and 17.5 mm or less. The disposable diaper according to the above <21>, preferably 12.5 mm or less.
<23>
The internal angle formed by the separate joint extending in the direction intersecting the orientation direction of the hydrophilic fibers and the orientation direction of the hydrophilic fibers is preferably 25 degrees or more, and preferably 30 degrees or more. The disposable diaper according to <21> or <22>, which is more preferably and preferably 85 degrees or less.
<24>
The disposable diaper according to any one of <1> to <19>, wherein the outer body has hydrophobic fibers on the skin contact surface of the outer body other than the sweat absorbing region.
<25>
The sheet member forming the sweat-absorbing area is composed of two composite nonwoven fabrics in which the hydrophobic layer and the hydrophilic layer are bonded with the hot melt adhesive, and the sheet member is composed of the constituent fibers of the hydrophobic layer and the hydrophilic layer. It has a plurality of fusion-bonded fixing portions formed by fixing the constituent fibers of the layer, and the ratio of the total area of the fusion-fixed portion to the total area of the sweat-absorbing region is preferably 15% or less. The disposable diaper according to <18> or <19>, wherein the content is more preferably 10% or less, more preferably 1% or more, and further preferably 3% or more.
<26>
The area of one of the fused fixing portions is preferably 5 mm ² or less, more preferably 4 mm ² or less, and preferably 0.5 mm ² or more, and 0.75 mm ² or more. The disposable diaper according to <25>, which is more preferably the disposable diaper.
<27>
A plurality of through holes penetrating the hydrophobic layer and the hydrophilic layer of the sheet member are arranged in the sweat absorbing region, and the area of the through holes is 0.5 mm ² or more and 5 mm ² or less. The disposable diaper according to the above <25> or <26>, preferably 0.75 mm ² or more and 4 mm ² or less.
<28>
The disposable diaper according to any one of <1> to <27>, wherein an elastic member is arranged between the hydrophobic layer and the hydrophilic layer in the sweat absorbing region.
<29>
The disposable diaper according to <28>, wherein the elastic member extends in the orientation direction of the hydrophilic fibers and is intermittently arranged in a direction intersecting the orientation direction.
<30>
The disposable diaper according to any one of <1> to <29>, wherein at least one of the hydrophobic layer and the hydrophilic layer is made of a stretchable non-woven fabric.

<31>
The proportion of hydrophobic fibers in the fibers constituting the hydrophobic layer is preferably larger than 50% by mass, more preferably 80% by mass or more, and preferably 100% by mass or less, said <1. > The disposable diaper according to any one of <30>.
<32>
The basis weight of the hydrophobic layer is preferably 5 g / m ² or more, more preferably 8 g / m ² or more, and preferably 25 g / m ² or less, and 20 g / m ² or less. The disposable diaper according to any one of <1> to <31>, more preferably present.
<33>
The proportion of the hydrophilic fibers in the fibers constituting the hydrophilic layer is preferably larger than 50% by mass, more preferably 80% by mass or more, and preferably 100% by mass or less, said <1. > The disposable diaper according to any one of <32>.
<34>
The basis weight of the hydrophilic layer is preferably 8 g / m ² or more, more preferably 10 g / m ² or more, and preferably 30 g / m ² or less, and 25 g / m ² or less. The disposable diaper according to any one of <1> to <33>, more preferably present.
<35>
The width of the first joint (the length in the orientation direction of the hydrophilic fibers) is preferably 0.05 mm or more, more preferably 0.1 mm or more, and 2 mm or less. The disposable diaper according to any one of <1> to <34>, preferably having a size of 1 mm or less.
<36>
The distance between the first joints adjacent to each other in the orientation direction of the hydrophilic fibers is preferably 1 mm or more, more preferably 3 mm or more, and preferably 15 mm or less, and 10 mm or less. The disposable diaper according to any one of <1> to <35>, more preferably.
<37>
The contact angle of water with respect to the joint portion by the hot melt adhesive is 90 degrees or more, preferably 90 degrees or more, preferably 120 degrees or less, and preferably 100 degrees or less. The disposable diaper according to any one of <1> to <36>, which is more preferable.
<38>
The joint portion has a first joint portion and a second joint portion extending in the orientation direction of the hydrophilic fibers, and the second joint portion has a width thereof (orientation of the hydrophilic fibers). The length in the direction intersecting the direction ) is preferably 0.05 mm or more, more preferably 0.1 mm or more, more preferably 2 mm or less, still more preferably 1 mm or less. , The disposable diaper according to any one of <1> to <37>.
<39>
The distance between the second joints is preferably 1 mm or more, more preferably 3 mm or more, more preferably 25 mm or less, still more preferably 20 mm or less, said <38>. Disposable diapers listed in.
<40>
The internal angle formed by the first joint extending in the direction intersecting the orientation direction of the hydrophilic fibers and the orientation direction of the hydrophilic fibers is preferably 30 degrees or more, preferably 45 degrees or more. The disposable diaper according to any one of <1> to <39>, wherein the temperature is more preferably 90 degrees or less.
<41>
The joint portion has the first joint portion and the second joint portion extending in the orientation direction of the hydrophilic fiber, and the first joint portion and the joint portion having the second joint portion. The basis weight of the hot melt adhesive is preferably 4 g / m ² or more, more preferably 6 g / m ² or more, and preferably 40 g / m ² or less, preferably 30 g / m ² . The disposable diaper according to any one of <1> to <40>, more preferably the following.
<42>
The ratio of the coating area of the hot melt adhesive forming the joint portion in the sweat absorbing region is preferably 3% or more, more preferably 5% or more, and more preferably 30% or less. The disposable diaper according to any one of <1> to <41>, preferably 25% or less.
<43>
The interfiber distance of the fibers constituting the hydrophilic layer in the sweat-absorbing region is preferably 9 μm or more, more preferably 15 μm or more, and preferably 100 μm or less, preferably 80 μm or less. The disposable diaper according to any one of <1> to <42>, which is more preferable.

<44>
A hydrophobic layer having hydrophobic fibers and arranged on the skin contact surface side and a hydrophilic layer having hydrophilic fibers and arranged adjacent to the non-skin contact surface side of the hydrophobic layer are provided. It is a sweat-absorbing sheet for disposable diapers formed by joining the hydrophobic layer and the hydrophilic layer with a hot melt adhesive, and the joint portion with the hot melt adhesive is the orientation direction of the hydrophilic fibers. A sweat-absorbing sheet for disposable diapers, which has a first joint portion extending in a direction intersecting with the joint portion and intermittently arranged in the orientation direction, and having a water contact angle of 90 degrees or more with respect to the joint portion.

According to the disposable diaper of the present invention and the sweat-absorbing sheet for disposable diapers, sweat can be efficiently diffused and a dry feeling can be improved.

Claims (20)

An absorbent body including a liquid-retaining absorber and a surface sheet arranged on the skin contact surface side of the absorber, and an absorbent body arranged on the non-skin contact surface side of the absorbent body to fix the absorbent body. A disposable diaper with an exterior body
The disposable diaper has a ventral portion located on the ventral side of the wearer, a dorsal portion located on the dorsal side, and a crotch portion located between the ventral portion and the dorsal portion.
The exterior body has a sweat absorbing region on the skin contact surface of the dorsal side or the ventral side.
The sweat-absorbing region has a hydrophobic layer having hydrophobic fibers and arranged on the skin contact surface side of the sweat-absorbing region, and a hydrophilic fiber adjacent to the non-skin contact surface side of the hydrophobic layer. It is formed by joining the hydrophobic layer and the hydrophilic layer with a hot melt adhesive, including the hydrophilic layer arranged therein.
The joint portion joined with the hot melt adhesive has a first joint portion extending in a direction intersecting the orientation direction of the hydrophilic fibers and intermittently arranged in the orientation direction.
The contact angle of water with respect to the joint is 90 degrees or more.
The hydrophilic layer is bonded to a layer different from the hydrophobic layer with a hot melt adhesive on a non-skin contact surface which is a surface opposite to the surface facing the hydrophobic layer, and the hot melt adhesive is used. A disposable diaper in which another joint portion joined in is extended in a direction intersecting the orientation direction of the hydrophilic fibers and is intermittently arranged in the orientation direction. The disposable diaper according to claim 1, wherein the proportion of the hydrophilic fibers in the fibers constituting the hydrophilic layer is greater than 50% by mass and 100% by mass or less. The disposable diaper according to claim 1 or 2, wherein the weight ratio of the hydrophobic fiber to the fibers constituting the hydrophobic layer is more than 50% by mass and 100% by mass or less. The disposable diaper according to any one of claims 1 to 3, wherein the internal angle formed by the extending direction of the first joint and the orientation direction of the hydrophilic fibers is 30 degrees or more and 90 degrees or less. The disposable diaper according to any one of claims 1 to 4, wherein the hot melt adhesive having a basis weight of the first joint portion is 4 g / m ² or more and 40 g / m ² or less. The disposable diaper according to any one of claims 1 to 5, wherein the ratio of the coating area of the hot melt adhesive in the sweat absorbing region is 3% or more and 30% or less. The disposable diaper according to any one of claims 1 to 6, wherein the interfiber distance between the fibers constituting the hydrophilic layer is 9 μm or more and 100 μm or less. The disposable diaper according to any one of claims 1 to 7, wherein the orientation direction of the hydrophilic fiber and the orientation direction of the hydrophobic fiber are the same direction. The disposable diaper according to any one of claims 1 to 8, wherein a plurality of fusion-bonded fixing portions formed by fixing the hydrophobic layer and the hydrophilic layer are formed in the sweat-absorbing region. The disposable diaper according to any one of claims 1 to 9, wherein a plurality of through holes penetrating the hydrophobic layer and the hydrophilic layer are arranged in the sweat absorbing region. Any of claims 1 to 10, wherein the junction further has a second junction extending in the orientation direction of the hydrophilic fibers and intermittently arranged in a direction intersecting the orientation direction. Disposable diaper according to item 1. The internal angle formed by the first joint portion on the surface of the hydrophilic layer facing the hydrophobic layer and the orientation direction of the hydrophilic fibers is the same as the separate joint portion on the non-skin contact surface of the hydrophilic layer. The disposable diaper according to any one of claims 1 to 11, which is larger than the internal angle formed by the orientation direction of the sex fibers. The basis weight of the hot melt adhesive at the joint portion on the surface of the hydrophilic layer facing the hydrophobic layer is larger than the basis weight of the hot melt adhesive at the separate joint portion on the non-skin contact surface of the hydrophilic layer. The large disposable diaper according to claim 12. The coating area of the hot melt adhesive forming the joint portion on the surface of the hydrophilic layer facing the hydrophobic layer is the hot melt adhesive forming the separate joint portion on the non-skin contact surface of the hydrophilic layer. The disposable diaper according to claim 12 or 13, which is larger than the coating area. The one according to any one of claims 1 to 14, wherein the hydrophobic layer is arranged on the skin contact surface side of the exterior body, and the hydrophilic layer is arranged on the non-skin contact surface side of the exterior body. Disposable diapers. The sweat-absorbing region is formed by using a sheet member separate from the outer layer sheet forming the non-skin contact surface of the exterior body and the inner layer sheet arranged to face the skin contact surface of the outer layer sheet. The disposable diaper according to any one of claims 1 to 14. The disposable diaper according to claim 16, wherein the orientation direction of the fibers constituting the outer layer sheet, the orientation direction of the fibers constituting the inner layer sheet, and the orientation direction of the fibers constituting the sheet member are all the same direction. .. The disposable diaper according to any one of claims 1 to 17, wherein an elastic member is arranged between the hydrophobic layer and the hydrophilic layer in the sweat absorbing region. The disposable diaper according to claim 18, wherein the elastic member extends in the orientation direction of the hydrophilic fibers and is intermittently arranged in a direction intersecting the orientation direction. The disposable diaper according to any one of claims 1 to 19, wherein at least one of the hydrophobic layer and the hydrophilic layer is made of a stretchable non-woven fabric.

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