JP5560071B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article having a stretchable part, such as a disposable diaper.

  Conventionally, the sweat transpiration of the waist flap (generally the longitudinally outward portion from the absorbent main body including the absorbent core) has been improved to prevent the occurrence of eczema, rash, rash, etc. Disposable diapers are known. For example, Patent Document 1 discloses a disposable diaper in which a breathable sweat-absorbing sheet is bonded to the inner surface of a waist flap. Patent Document 2 discloses a disposable diaper in which a hydrophilic web having long fibers oriented in the width direction is arranged on the inner surface of a waist flap.

  However, in the disposable diaper described in Patent Document 1, the sweat absorbing sheet is formed of an upper layer containing hydrophilic fibers and a lower layer made of hydrophobic fibers integrally laminated thereon, and the sweat absorbing sheet The sweat absorbed in the water tends to stay inside, and the sweat absorbent sheet tends to be in a wet state. When such a sweat-absorbing sheet comes into contact with the wearer's skin for a long time, there is a high possibility that the skin will be damaged.

  Moreover, in the disposable diaper described in Patent Document 2, the waist flap has a structure in which a hydrophobic outer layer sheet, a hydrophobic inner layer sheet, and an elastic member are arranged between these sheets. The hydrophilic inner layer sheet is formed by arranging a hydrophilic web obtained by opening tow. As described above, since the hydrophilic web is formed of long fibers, the distance between the long fibers is increased due to contraction by the elastic member during use, and the transferability of sweat in the hydrophilic web is reduced or used. By repeating the contraction by the elastic member at the time, the long fibers are separated from each other, it becomes difficult to follow the expansion and contraction, and the transferability of sweat in the hydrophilic web may be further deteriorated.

JP 2000-189454 A JP 2006-141549 A

  Therefore, the subject of this invention is providing the absorbent article which aimed at prevention of generation | occurrence | production of eczema, a rash, a rash, etc. by improving the diffusibility of sweat.

  The present invention is a disposable diaper comprising an absorbent body in the center of a disposable diaper from the back side to the abdominal side, and a hydrophilic sheet is disposed on the waist flap, wherein the hydrophilic sheet is skin contacted An inner hydrophilic sheet forming a surface, and an outer hydrophilic sheet disposed on the non-skin-contacting surface side of the inner hydrophilic sheet, and these sheets are at the end of the waist flap at the back side portion. A waist region including a region between an edge and an edge of the absorbent body, the waist flap including the outer hydrophilic sheet and the inner hydrophilic sheet being stretched in the width direction of the disposable diaper. A gather is formed by a waist elastic member disposed inside the waist flap, and the outer hydrophilic sheet is a disposable diaper having a higher liquid diffusibility than the inner hydrophilic sheet. It is intended to.

  According to the absorbent article of the present invention, since sweat has a high diffusibility, the occurrence of eczema, rash, rash and the like can be reduced.

FIG. 1 is a developed plan view showing a state where the unfolded disposable diaper according to the first embodiment of the present invention is unfolded and expanded. 2 is a cross-sectional view taken along line Y1-Y1 of FIG. FIG. 3 is an enlarged plan view of an outer hydrophilic sheet used in the diaper shown in FIG. FIG. 4 is a perspective view of a pants-type disposable diaper that is a second embodiment of the present invention. FIG. 5 is a developed plan view showing a state where the pants-type disposable diaper shown in FIG. 4 is developed and extended. 6 is a cross-sectional view taken along line Y2-Y2 of FIG. FIG. 7 is an enlarged plan view of the inner hydrophilic sheet used in the diaper shown in FIG. FIG. 8 is an expanded plan view showing a state in which the pant-type disposable diaper according to the third embodiment of the present invention is expanded and expanded. 9 is a cross-sectional view taken along line Y3-Y3 of FIG. FIG. 10 is a developed plan view showing a state in which the pants-type disposable diaper according to the fourth embodiment of the present invention is developed and extended. 11 is a cross-sectional view taken along line Y4-Y4 of FIG. FIG. 12 is a perspective view showing a partially broken outer packaging material of the pants-type disposable diaper shown in FIG. 10 in a natural state. 13 is a plan view showing a state in which the outer packaging material of the pants-type disposable diaper shown in FIG. 12 is extended.

  Hereinafter, a preferred first embodiment of the disposable diaper of the present invention will be described with reference to FIGS.

The disposable diaper 1A of the first embodiment (hereinafter, also referred to as “diaper 1A”) is, as shown in FIGS. 1 and 2, from the back side portion A located on the back side of the wearer at the time of wearing. The absorbent body 4 in the center in the width direction of the disposable diaper (hereinafter referred to as “X direction”. X direction: a direction perpendicular to the center line CL extending in the longitudinal direction of the diaper 1A) across the ventral portion B located on the side. And a hydrophilic sheet 7 is disposed on the waist flaps 6a and 6b. As shown in FIG. 2, the hydrophilic sheet 7 includes an inner hydrophilic sheet 71 forming a skin contact surface and an outer hydrophilic sheet 72 disposed on the non-skin contact surface side of the inner hydrophilic sheet 71. Have. As the outer hydrophilic sheet 72, a sheet having higher liquid diffusibility than the inner hydrophilic sheet 71 is used. As shown in FIGS. 1 to 2, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are at least a region between the edge 61 of the waist flap 6 a on the back side A and the edge 41 of the absorbent body 4. Is disposed in the waist region A1 including In the waist flap 6a including the outer hydrophilic sheet 72 and the inner hydrophilic sheet 71, a gather is formed by the waist elastic member 8 arranged inside the waist flap 6a in a state of being stretched in the width direction (X direction) of the diaper 1A. Has been.
As shown in FIG. 1, the diaper 1A is formed symmetrically with respect to the center line CL. Therefore, in the following description, the right-side part shown in FIG.

The diaper 1A will be described in detail. As shown in FIG. 1, the diaper 1A is an unfolded disposable diaper, which is located on the back side A of the wearer when worn, and on the abdomen of the wearer. It has the crotch part C arrange | positioned between the ventral part B and the dorsal part A and the ventral part B. As shown in FIG. 1, the diaper 1 </ b> A has a pair of left and right fastening tapes 9, 9 connected to left and right edges of the back side portion A. As shown in FIG. 1, the diaper 1 </ b> A has a target tape (not shown) for fastening the fastening tape 6 on the outer surface of the ventral side B.
The diaper 1 </ b> A has a shape that is long in the same direction as the absorber 4 in a state where the diaper 1 </ b> A is expanded in a planar shape as shown in FIG. 1.

  As shown in FIG. 1, the diaper 1A includes a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a liquid-retaining absorbent interposed between the two sheets 2 and 3. 4. The top sheet 2 and the back sheet 3 have both side edges at the center in the longitudinal direction (hereinafter referred to as “Y direction”; Y direction: a direction parallel to the center line CL), that is, the crotch part of the diaper 1. In a region corresponding to C, the region is curved in an hourglass shape bound inward in the width direction (X direction). As shown in FIG. 1, the top sheet 2 and the back sheet 3 that forms the outer surface of the diaper 1 </ b> A are integrated by being joined together. The absorber 4 is also curved and formed in an hourglass shape confined in the width direction (X direction) in a region corresponding to the crotch portion C in accordance with the shape of the top sheet 2 and the back sheet 3. The absorber 4 is sandwiched between the top sheet 2 and the back sheet 3. These structures are the same as the structure of the conventional deployment type disposable diaper.

In the disposable diaper 1A of the first embodiment, the inner hydrophilic sheet 71 constituting the hydrophilic sheet 7 forms the top sheet 2. That is, in the diaper 1A, the topsheet 2 is an inner hydrophilic sheet 71 as shown in FIGS.
Note that the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 described later of the hydrophilic sheet 7 are in a state where fibers are entangled, for example, a nonwoven fabric, and are not in a web state where fibers are not entangled. .

  In the diaper 1A, the inner hydrophilic sheet 71 and the back sheet 3 extend outward in the longitudinal direction (Y direction) from both end edges 41, 41 in the longitudinal direction (Y direction) of the absorbent body 4, respectively. The extended portion forms a waist flap 6a on the back side A and a waist flap 6b on the abdominal side B.

  In the disposable diaper 1A of the first embodiment, the outer hydrophilic sheet 72 is between the end edge 61 of the waist flap 6a on the back side A and the end edge 41 of the absorbent body 4 as shown in FIGS. The waist region A1 including the region and the waist region B1 including the region between the end edge 61 of the waist flap 6b on the ventral side B and the end edge 41 of the absorbent body 4 are disposed. As shown in FIGS. 1 and 2, the outer hydrophilic sheet 72 is inside the waist flap 6 a of the back side part A and the waist flap 6 b of the abdominal side part B, specifically, the inner hydrophilic sheet 71 and It is arranged between the back sheet 3. The outer hydrophilic sheet 72 on the back side A side extends in the width direction (X direction) between the fastening tapes 9, 9 provided on the left and right side edge portions in the width direction (X direction) of the back side A, respectively. In the longitudinal direction (Y direction), it extends from the edge 61 of the waist flap 6a of the back side portion A to the absorber 4 beyond the edge 41 of the absorber 4. The outer hydrophilic sheet 72 on the ventral side B side has the same width and the same length as the outer hydrophilic sheet 72 on the back side A described above.

  In the disposable diaper 1A of the first embodiment, the outer hydrophilic sheet 72 is formed of two sheets as shown in FIG. The two outer hydrophilic sheets 72 have the same shape and the same size, and both have higher liquid diffusibility than the inner hydrophilic sheet 71 (surface sheet 2). The liquid diffusibility is measured by the following method for measuring the liquid diffusion area.

<Measurement method of liquid diffusion area>
A sample of each of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 cut into 100 mm × 100 mm squares is placed on the acrylic plate, and 0.05 mL of colored water is dropped onto the acrylic plate from above 30 mm. After 10 minutes, the diffusion area of the colored water is measured using an image analyzer. The greater the measured value obtained, the higher the liquid diffusibility.

As shown in FIG. 3, the two outer hydrophilic sheets 72 have their constituent fibers oriented in the width direction (X direction) of the diaper 1A. The orientation of the fiber is preferably 1 or more, more preferably 1.2 or more, from the viewpoint of diffusibility in the width direction (X direction) and strength in the width direction (X direction). preferable. The degree of orientation is measured using a Microwave molecular orientation analyzer MOA-2001A manufactured by KANZAKI. Each of the outer hydrophilic sheet 72 and the inner hydrophilic sheet 71 cut into a length of 100 mm and a width of 50 mm is used as a sample, and an average value of three points in each sample is measured to obtain an orientation degree.
The inner hydrophilic sheet 71 (surface sheet 2) in the diaper 1A is oriented in the longitudinal direction (Y direction) (not shown).

  As shown in FIGS. 1 and 2, the waist elastic member 8 is disposed inside the waist flap 6 a on the back side A and the waist flap 6 b on the abdominal side B in a state of extending in the width direction (X direction). Yes. In the disposable diaper 1A of the first embodiment, a plurality of 1 to 10 thread-like waist elastic members 8 are arranged between two outer hydrophilic sheets 72 and 72 as shown in FIGS. Are arranged intermittently in the longitudinal direction (Y direction). Gathers are formed on the waist flap 6a on the back side A and the waist flap 6b on the abdomen B including the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 by the waist elastic member 8 arranged in this way. Yes.

The stretch magnification of the waist elastic member 8 is preferably 150% to 300% from the viewpoint of striking the wearer's body without any gaps, and expanding and contracting following changes in posture and abdominal circumference due to breathing, etc., 200% More preferably, it is ˜250%. The expansion magnification here is a value obtained from the following equation when the length when not stretched is A (mm) and the length when stretched is B (mm).
Stretch magnification (%) = (B / A) × 100

  From the left and right side edges in the longitudinal direction (Y direction) of the absorbent body 4, the top sheet 2 (inner hydrophilic sheet 71) and the back sheet 3 respectively extend outward in the width direction (X direction) as shown in FIG. The extended top sheet 2 and the extended back sheet 3 are joined to form a pair of left and right leg flaps 10, 10. The leg flaps 10 and 10 are provided with 1 to 5 thread-like elastic members 10a for forming leg gathers. The elastic member 10a for forming leg gathers is a top sheet 2 (inner hydrophilic sheet 71). And it is clamped and fixed by the back sheet 3. And the leg gathers are formed in the crotch part C of the diaper 1 because the elastic elastic member 10a contracts.

  Three-dimensional gather forming sheets 11 and 11 are arranged on both the left and right side portions of the diaper 1 </ b> A in the longitudinal direction (Y direction) so as to cover the side portions of the topsheet 2. Each three-dimensional guard forming sheet 11 is fixed to the top sheet 2 and in the width direction in a predetermined width region at both ends in the longitudinal direction (Y direction) and the outer edge in the width direction (X direction). The inner side (X direction) is in a free state. The three-dimensional guard forming sheet 11 has a three-dimensional guard-forming elastic member 11a at the inner edge in the width direction (X direction), that is, the edge near the center line CL. Due to the contraction force of the elastic member, the free state portion on the inner side in the width direction (X direction) of the three-dimensional gather forming sheet 11 rises, and a three-dimensional gather is formed on the skin contact surface side of the wearer in the diaper 1A.

The material for forming the disposable diaper 1A of the first embodiment will be described.
As the hydrophilic sheet 7, specifically, the top sheet 2 (inner hydrophilic sheet 71) and the outer hydrophilic sheet 72, a sheet material that is hydrophilic and can absorb and hold water is used. Here, the “sheet material” means a material in which fibers are entangled, for example, a nonwoven fabric, except for a web in which fibers are not entangled. “Hydrophilic” includes both those in which the fibers themselves absorb and hold water and those that absorb and hold water in the space between the fibers. Examples thereof include a sheet of hydrophilic fibers, a sheet obtained by hydrophilizing hydrophobic fibers with an oil agent, and the like. Specifically, non-woven fabrics containing hydrophilic fibers such as cotton, rayon and pulp (for example, spunlace nonwoven fabrics) and non-woven fabrics made of hydrophobic fibers such as polyethylene fibers and polypropylene fibers are subjected to a hydrophilization treatment with an oil or the like. Preferably used. As the surface sheet 2 (inner hydrophilic sheet 71) and the outer hydrophilic sheet 72, either a sheet made of hydrophilic fibers or a sheet hydrophilized hydrophobic fibers can be used, and the combination thereof is also limited. However, when worn for a long time in a state of sweating a large amount, the top sheet 2 (inner hydrophilic sheet) from the viewpoint of keeping the dry feeling on the skin side longer because the liquid retention of the sheet itself is low For 71), it is preferable to use a sheet obtained by hydrophilizing hydrophobic fibers. The basis weight of the hydrophilic sheet 7 is determined in consideration of its water absorption capacity. For example, when a hydrophilic fiber sheet is used as the hydrophilic sheet 7, the basis weight of the top sheet 2 (inner hydrophilic sheet 71) is preferably 10 to 100 g / m ² , and 20 to 60 g / m ^2. More preferably. If the sheet of hydrophilic fibers are used, the basis weight of the outer hydrophilic sheet 72 is preferably 10 to 80 g / m ^2, and still more preferably from 10 to 60 g / m ^2.

  The inner hydrophilic sheet 71 improves the softness, can easily form a fine gather by contraction of the elastic waist member 8, and the viewpoint of reducing the uncomfortable feeling given to the wearer when contacting the skin, From the viewpoint of facilitating the transfer of sweat stored in the gaps between fibers to the outer hydrophilic sheet 72 due to gather expansion and contraction, it is preferable to use a material that is more easily compressed and deformed than the outer hydrophilic sheet 72. The phrase “easy to be deformed by compression” refers to a sheet that is very easy to be deformed by compression in the thickness direction.

The outer hydrophilic sheet 72 preferably has a higher density than the inner hydrophilic sheet 71 from the viewpoint of quickly transferring sweat from the skin contact surface side to the non-skin contact surface side by capillary force. When a hydrophilic fiber sheet is used as the hydrophilic sheet 7, the density of the outer hydrophilic sheet 72 is preferably 0.05 to 0.3 g / cm ³ , preferably 0.1 to 0.2 g / cm. More preferably, it is ³ . When a sheet of hydrophilic fibers is used, the basis weight of the surface sheet 2 (inner hydrophilic sheet 71) is preferably 0.01 to 0.2 g / cm ³ , and 0.02 to 0.1 g / cm. More preferably, it is ³ .

  The outer hydrophilic sheet 72 should have a higher transpiration property than the inner hydrophilic sheet 71 from the viewpoint of causing the outer hydrophilic sheet 72 to evaporate without causing the sweat transferred from the skin contact surface side to flow back. Is preferred. The liquid transpiration is measured by the following liquid transpiration measurement method.

<Measurement method of liquid transpiration>
Spray 0.2 g of distilled water on the acrylic plate. A sample of each of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 cut into 100 mm × 100 mm squares is placed on the sprayed distilled water, and the amount of distilled water that evaporates in a constant temperature environment at a temperature of 20 ° C. and a humidity of 65% RH. Measure by weight change. Divide the amount of transpiration of distilled water after 10 minutes (the weight of the sample containing distilled water after 10 minutes-the initial weight of the sample) by the initial distilled water (0.2 g), and divide the ratio by liquid transpiration. Value. The measured value is an average value of n = 3.

  As the three-dimensional guard forming sheet 11 for forming the back sheet 3, the absorbent body 4 and the pair of three-dimensional guards, any sheet can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers. For example, as the back sheet 3, a resin film or a laminate of a resin film and a nonwoven fabric can be used. As the absorbent body 4, a fiber aggregate of fiber materials such as pulp or a material in which a superabsorbent polymer is supported on a fiber aggregate is used that is wrapped with a covering material such as tissue paper or a water-permeable nonwoven fabric. Can do. As the three-dimensional guard forming sheet 11, a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used.

  The waist elastic member 8, the leg gather forming elastic member 10a, and the three-dimensional guard forming elastic member 11a can be used without particular limitation as long as they are usually used in absorbent articles such as disposable diapers. For example, a stretchable material made of natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, polyethylene-α olefin copolymer such as ethyl acrylate-ethylene, or the like can be used.

  As a hook material which forms the fastening tape 9, if it is normally used for absorbent articles, such as a disposable diaper, it can use without a restriction | limiting especially. For example, as a hook material, "Magic tape (registered trademark)" (manufactured by Kuraray), "Quicklon (registered trademark)" (manufactured by YKK), "Majikurosu (registered trademark)" (manufactured by Kanebo Bell Touch), etc. The male member etc. in can be used. The target tape is made of a loop material having a surface structure that can be engaged with an engagement protrusion of the hook material, and as such a loop material, a material that can fix the hook material by pressing the hook material is used. Can be used without limitation. For example, the female member in the various well-known mechanical hook-and-loop fastener mentioned above can be used, for example. Moreover, the outer surface (non-skin contact surface of the back sheet 3) of the abdominal side part B can also be comprised from the material which can be directly engaged with the engagement protrusion of a hook material, for example, a nonwoven fabric rich in engagement property.

Next, the effect at the time of using the diaper 1A of 1st Embodiment of this invention mentioned above is demonstrated.
As shown in FIGS. 1 and 2, the diaper 1A has a hydrophilic sheet 7 (an inner hydrophilic sheet that forms a skin contact surface) on the skin contact surfaces of the waist flaps 6a and 6b that are likely to cause eczema, rash, rash and the like. 71 and the outer hydrophilic sheet 72) disposed on the non-skin contact surface side of the inner hydrophilic sheet 71, the sweat of the wearer can be transferred to the inner hydrophilic sheet 71. As shown in FIG. 1, the diaper 1 </ b> A has a gather formed by a waist elastic member 8 on a waist flap 6 a, and is always expanded and contracted by the wearer's breathing and walking movements. The sweat transferred to the sheet 71 is easily transferred to the outer hydrophilic sheet 72. Since the outer hydrophilic sheet 72 of the diaper 1 </ b> A has a higher liquid diffusibility than the inner hydrophilic sheet 71, sweat that has migrated to the outer hydrophilic sheet 72 can be quickly diffused. In this way, the inner hydrophilic sheet 71 that forms the skin contact surface of the waist flap 6 is less likely to sweat and is less likely to be moistened, so that it is possible to prevent the occurrence of eczema, rash, rash, and the like. Further, since the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 of the diaper 1A are both sheets, the distance between the constituent fibers hardly changes due to gather expansion and contraction caused by the wearer's breathing or walking movement. Since the transferability of sweat from the adhesive sheet 71 to the outer hydrophilic sheet 72 is difficult to decrease, the effect of preventing the occurrence of eczema, rash, rash, etc. can be maintained.

  Further, as shown in FIG. 3, in the diaper 1A, the constituent fibers of the two outer hydrophilic sheets 72 are both oriented in the width direction (X direction) of the diaper 1A. Therefore, the sweat transferred to the outer hydrophilic sheet 72 can be diffused more quickly. In this way, the inner hydrophilic sheet 71 that forms the skin contact surface of the waist flap 6 is less likely to sweat and is less likely to be moistened, so that it is possible to prevent the occurrence of eczema, rash, rash, and the like.

Next, the disposable diaper of 2nd Embodiment of this invention is demonstrated based on FIGS.
About the disposable diaper 1B of 2nd Embodiment, a different point from the disposable diaper 1A of 1st Embodiment is demonstrated. The point which is not demonstrated especially is the same as that of 1 A of disposable diapers of 1st Embodiment, and description of 1 A of disposable diapers of 1st Embodiment is applied suitably.

The disposable diaper 1B of the second embodiment (hereinafter also referred to as “diaper 1B”) is a pants-type disposable diaper as shown in FIGS. The inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 of the diaper 1B are the skin contact of the folded portion 520 formed by folding the outer layer sheet 52 constituting the outer packaging material 5 of the diaper 1B in the waist region A1 of the back side portion A. On the contact surface, it is arranged in the width direction (X direction) of the diaper 1B. The waist elastic member 8 of the diaper 1 </ b> B is disposed between the outer layer sheet 52 and the inner layer sheet 51 disposed on the skin contact surface side of the outer layer sheet 52.
In the disposable diaper 1B of the second embodiment, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are separate sheets from the sheet constituting the outer packaging material 5 and the sheet constituting the absorbent main body 40 described later. It has a feature in a certain point.

  The diaper 1B will be described in detail. As shown in FIGS. 5 and 6, the diaper 1B includes an absorbent main body 40 having a top sheet 2, a back sheet 3, and an absorbent body 4 interposed between both sheets 2, 3. And an outer packaging material 5 that extends over the entire outer side of the absorbent main body 40 and is located on the non-skin contact surface side of the absorbent main body 40 and that bonds and fixes the absorbent main body 40. 5, the side edges of the back side A and the side edges of the ventral side B are joined to each other by known joining means such as heat seal, high frequency seal, ultrasonic seal, etc. to form side seal portions 12, 12. (See FIG. 4). Thereby, as shown in FIG. 4, the waist opening part 13 and a pair of leg opening parts 14 and 14 are formed in the diaper 1B. A crotch portion C is formed between the back side portion A and the ventral side portion B.

  As shown in FIG. 5, the absorbent main body 40 has a vertically long rectangular shape, the longitudinal direction (Y direction) of which coincides with the longitudinal direction (Y direction) of the diaper 1, and the abdomen from the back side A of the diaper 1. It is joined to the width direction (X direction) center part of the outer packaging material 5 so that the side part B may be covered. As shown in FIG. 5, three-dimensional guard forming sheets 11, 11 are disposed on the left and right side portions of the absorbent main body 40, and the width direction (X direction) of each of the three-dimensional guard forming sheets 11 is inward. The elastic member 11a for forming a three-dimensional guard is arranged in an extended state on the side edge, and when worn, a three-dimensional gather is formed on both the left and right sides of the absorbent main body 40 by the contraction force of the elastic member 11a. .

  As shown in FIG. 6, the outer packaging material 5 is composed of two sheet materials. Specifically, the outer packaging material 5 is composed of a laminate of an outer layer sheet 52 and an inner layer sheet 51. The outer layer sheet 52 forms the outermost surface of the diaper 1B. The inner layer sheet 51 is disposed on the inner surface side of the diaper 1 </ b> B adjacent to the outer layer sheet 52. As shown in FIG. 5, the inner layer sheet 51 and the outer layer sheet 52 have the same shape at the side edges, but the shapes in the longitudinal direction (Y direction) are different. Specifically, as shown in FIG. 6, the outer layer sheet 52 has extending portions that extend in the front-rear direction from the longitudinal edge (Y direction) front-rear edge of the inner layer sheet 51. Each of the extending portions of the outer layer sheet 52 is folded back toward the absorbent main body 40 so as to cover the front and rear ends of the absorbent main body 40 after the absorbent main body 40 is arranged and fixed on the inner layer sheet 51 of the outer packaging material 5. A folded portion 520 is formed (see FIG. 6). As shown in FIG. 5, the free end edge of the folded portion 520 extends to the leg opening, that is, to a position covering the entire region of the side seal portion 12 and reaches the absorber 4. Thus, waist flaps 6a and 6b are formed on the diaper 1B by extending in the front-rear direction from the front and rear end edges 41 and 41 of the absorber 4, respectively (see FIG. 6).

  In the disposable diaper 1B of the second embodiment, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 constituting the hydrophilic sheet 7 are sheets of the same shape and the same size as shown in FIGS. It is arranged in the width direction (X direction) on the skin contact surface of the folded portion 520 on the side A side. The inner hydrophilic sheet 71 of the diaper 1 </ b> B is disposed on the skin contact surface of the outer hydrophilic sheet 72. In the diaper 1B, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are located between the edge 61 of the waist flap 6a on the back side A and the edge 41 of the absorbent body 4 as shown in FIGS. It is arranged in the waist region A1 including the region. As shown in FIGS. 5 and 6, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are wider than the width of the absorbent main body 40 in the width direction (X direction) and are larger than the interval between the side seal portions 12 and 12. Also extends to be narrower.

  As shown in FIGS. 5 and 6, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are arranged in the longitudinal direction (Y direction) from the edge 61 of the waist flap 6 a of the back side A to the free edge of the folded portion 520. It extends to an area that does not exceed. Thus, each of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 overlaps the folded portion 520 and does not exceed the free end portion of the folded portion 520, whereby the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are each It is possible to prevent the excreted urine and feces from permeating into the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 without coming into contact with the top sheet 2.

  When the disposable diaper 1B of the second embodiment is used, for example, for babies, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are, as shown in FIGS. It extends from the end edge 61 of the waist flap 6a of the back side A to the end edge of the absorbent main body 40 and further to the upper end of the absorbent body 4 over the end edge 41 of the absorbent body 4. Moreover, when using the disposable diaper 1B of 2nd Embodiment for adults, for example, the inner side hydrophilic sheet | seat 71 and the outer side hydrophilic sheet | seat 72 are the waist flaps of the back side part A in a longitudinal direction (Y direction). It extends from the edge 61 of 6a to the vicinity of the edge of the absorptive main body 40. Thus, when each of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 does not overlap the absorbent main body 40, the urine etc. once absorbed by the absorbent main body 40 is the inner hydrophilic sheet 71 and the outer hydrophilic sheet. 72 can be prevented from seeping out. Therefore, it is more effective at bedtime when the wearer's own weight is applied while urine is absorbed up to the end of the absorbent main body 40.

  The inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 of the disposable diaper 1B of the second embodiment are both oriented in the width direction (X direction) of the diaper 1A as shown in FIGS. doing. The outer hydrophilic sheet 72 preferably has a higher density than the inner hydrophilic sheet 71 from the viewpoint of quickly transferring sweat from the skin contact surface side to the non-skin contact surface side by capillary force (FIG. 3, see Fig. 7)

  In the disposable diaper 1B of 2nd Embodiment, as shown in FIG. 6, the waist elastic member 8 is the state of the waist flap 6a of the back side part A, and the abdominal side part B in the state extended in the width direction (X direction). It is arranged inside the waist flap 6b. In the disposable diaper 1B of the second embodiment, a plurality of 1 to 30 thread-like waist elastic members 8 include an inner layer sheet 51 and an outer layer sheet constituting the outer packaging material 5, as shown in FIGS. 52 and is intermittently juxtaposed in the longitudinal direction (Y direction). Gathers are formed on the waist flap 6a on the back side A and the waist flap 6b on the abdomen B including the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 by the waist elastic member 8 arranged in this way. ing.

The formation material of the disposable diaper 1B of 2nd Embodiment is demonstrated.
About the underpants type disposable diaper 1B of 2nd Embodiment, a different point from the underpants type disposable diaper 1A of 1st Embodiment is demonstrated. The point which is not demonstrated especially is the same as that of 1 A of underpants type disposable diapers of 1st Embodiment.

  As the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72, a sheet material that is hydrophilic and can absorb and retain water is used. As an example, a sheet of hydrophilic fibers can be mentioned. As the hydrophilic sheet 7 of the diaper 1B, the separate inner hydrophilic sheet 71 and outer hydrophilic sheet 72 are joined together by a known joining means such as adhesive, heat seal, high frequency seal, ultrasonic seal and the like. A sheet can be used.

  The outer layer sheet 51 and the inner layer sheet 52 constituting the outer packaging material 5 can be used without particular limitation as long as they are normally used for absorbent articles such as disposable diapers. For example, as the outer layer sheet 51 and the inner layer sheet 52, a water-repellent nonwoven fabric or the like can be used.

  When the disposable diaper 1B of the second embodiment of the present invention described above is used, the same effect as the disposable diaper 1A of the first embodiment is obtained.

Next, the disposable diaper of 3rd Embodiment of this invention is demonstrated based on FIGS.
About the disposable diaper 1B of 3rd Embodiment, the difference from the disposable diaper 1A of 1st Embodiment or the disposable diaper 1B of 2nd Embodiment is demonstrated. The point which is not demonstrated in particular is the same as the disposable diaper 1A of the first embodiment or the disposable diaper 1B of the second embodiment, and the description of the disposable diaper 1A of the first embodiment or the disposable diaper 1B of the second embodiment is appropriately applied. Is done.

The disposable diaper 1C of the third embodiment (hereinafter, also referred to as “diaper 1C”) is a pants-type disposable diaper, as is the case with the diaper 1B (see FIGS. 4 and 8). As shown in FIG. 9, the inner hydrophilic sheet 71 is formed by folding back the outer layer sheet 52 constituting the outer packaging material 5 of the diaper 1 </ b> C at the waist region A <b> 1 of the back side A and the waist region B <b> 1 of the abdominal side B. A folded portion 520 is formed. As shown in FIG. 9, the outer hydrophilic sheet 72 forms an inner layer sheet 51 disposed on the skin contact surface side of the outer layer sheet 52. The waist elastic member 8 is disposed between the outer layer sheet 52 and the outer hydrophilic sheet 72.
In the disposable diaper 1 </ b> C of the third embodiment, unlike the disposable diaper 1 </ b> B of the second embodiment, the inner hydrophilic sheet 71 is a folded portion 520 of the outer layer sheet 52 constituting the outer packaging material 5, and the outer hydrophilic sheet 72. Is characterized in that it is the inner layer sheet 51 constituting the outer packaging material 5.

  The diaper 1 </ b> C will be described in detail. The diaper 1 </ b> C includes an outer packaging material 5 that extends over the entire outer side of the absorbent main body 40 as shown in FIGS. 8 and 9. As shown in FIGS. 8 and 9, the outer packaging material 5 is composed of a laminate of an outer layer sheet 52 and an inner layer sheet 51. The outer layer sheet 52 forms the outermost surface of the diaper 1B. The inner layer sheet 51 is disposed on the inner surface side of the diaper 1 </ b> B adjacent to the outer layer sheet 52. In the disposable diaper 1 </ b> C of the third embodiment, the inner sheet 51 is an outer hydrophilic sheet 72.

  As shown in FIG. 8, the inner layer sheet 51 (outer hydrophilic sheet 72) and the outer layer sheet 52 have the same outline at the side edges, but the shapes in the longitudinal direction (Y direction) are different. ing. Specifically, as shown in FIG. 9, the outer layer sheet 52 has extending portions extending in the front-rear direction from the front-rear edge in the longitudinal direction (Y direction) of the inner layer sheet 51 (outer hydrophilic sheet 72). ing. Each of the extending portions of the outer layer sheet 52 is absorbent so as to cover the front and rear ends of the absorbent main body 40 after the absorbent main body 40 is arranged and fixed on the inner layer sheet 51 (outer hydrophilic sheet 72) of the outer packaging material 5. Folded to the main body 40 side to become a folded portion 520 (see FIG. 6). In the disposable diaper 1 </ b> C of the third embodiment, the folded portion 520 is the inner hydrophilic sheet 71. The free end edges of the folded portion 520 (inner hydrophilic sheet 71) are the front and rear ends of the absorbent main body 40 from the end edge 61 of the waist flap 6a on the back side A and the end edge 61 of the waist flap 6b on the ventral side B, respectively. It extends beyond the respective edges and further beyond both front and rear end edges 41 of the absorbent body 4 and onto the absorbent body 4 (see FIGS. 8 and 9).

  In the disposable diaper 1C of the third embodiment, as shown in FIG. 8, the waist elastic member 8 is stretched in the width direction (X direction), and the waist flap 6a of the back side A and the ventral side B It is arranged inside each of the waist flaps 6b. In the disposable diaper 1 </ b> C of the third embodiment, a plurality of 1 to 30 thread-like waist elastic members 8, as shown in FIGS. 8 and 9, have an inner layer sheet 51 (outer hydrophilic property) constituting the outer packaging material 5. The sheet 72) and the outer layer sheet 52 are arranged intermittently in the longitudinal direction (Y direction). By the waist elastic member 8 arranged in this way, the waist flap 6a on the back side A including the inner hydrophilic sheet 71 (the folded portion 520 of the outer layer sheet 52) and the outer hydrophilic sheet 72 (the inner layer sheet 51), and the belly A gather is formed on each of the waist flaps 6b of the side portion B.

  About the formation material of the disposable diaper 1C of 3rd Embodiment, it is the same as that of the underpants type disposable diaper 1A of 1st Embodiment, or the underpants type disposable diaper 1B of 2nd Embodiment. That is, the inner hydrophilic sheet 71 is the same as the outer layer sheet 52 constituting the outer packaging material 5, and the outer hydrophilic sheet 72 is the same as the inner layer sheet 51 constituting the outer packaging material 5.

The effect at the time of using the disposable diaper 1C of 3rd Embodiment of this invention mentioned above is demonstrated.
The disposable diaper 1C of the third embodiment has the same effects as the disposable diaper 1A of the first embodiment or the disposable diaper 1B of the second embodiment. Hereinafter, effects different from the deployable disposable diaper 1A of the first embodiment or the disposable diaper 1B of the second embodiment will be described.

  Since the disposable diaper 1C of the third embodiment is smaller than the number of constituent members of the diaper 1A and the diaper 1B, the gathers formed on the waist flap 6a on the back side A and the waist flap 6b on the abdomen B respectively. Finely, the feeling of touch improves.

  Since the disposable diaper 1C of the third embodiment is smaller than the number of constituent members of the diaper 1A and the diaper 1B, the heat retaining properties of the waist flap 6a on the back side A and the waist flap 6b on the abdomen B are low and worn. Makes it difficult for people to sweat.

Next, the disposable diaper of 4th Embodiment of this invention is demonstrated based on FIGS.
About the disposable diaper 1D of 4th Embodiment, the point which is different from the disposable diaper 1A of 1st Embodiment, the disposable diaper 1B of 2nd Embodiment, or the disposable diaper 1C of 3rd Embodiment is demonstrated. The points that are not particularly described are the same as the disposable diaper 1A of the first embodiment, the disposable diaper 1B of the second embodiment, or the disposable diaper 1C of the third embodiment, and the disposable diaper 1A of the first embodiment, the second embodiment. The description of the disposable diaper 1B or the disposable diaper 1C of the third embodiment is applied as appropriate.

The disposable diaper 1D of the fourth embodiment (hereinafter also referred to as “diaper 1D”) is a pants-type disposable diaper, as in the diaper 1B and the diaper 1C (see FIGS. 4 and 10). As shown in FIG. 11, the inner hydrophilic sheet 71 is an inner layer sheet 51 disposed on the skin contact surface side constituting the outer packaging material 5 of the diaper 1D, and the outer hydrophilic sheet 72 is an outer packaging material of the diaper 1D. 5 is an outer layer sheet 52 that forms the outermost surface of the diaper 1D. As shown in FIG. 11, the waist elastic member 8 is disposed between the inner hydrophilic sheet 71 (inner layer sheet 51) and the outer hydrophilic sheet 72 (outer layer sheet 52).
In the disposable diaper 1D of the fourth embodiment, unlike the disposable diaper 1B of the second embodiment and the disposable diaper 1C of the third embodiment, the inner hydrophilic sheet 71 is the inner layer sheet 51 constituting the outer packaging material 5, The outer hydrophilic sheet 72 is characterized in that it is the outer layer sheet 52 constituting the outer packaging material 5.

  In the disposable diaper 1D of the fourth embodiment, as shown in FIGS. 10 and 11, the inner hydrophilic sheet 71 (inner layer sheet 51) and the outer hydrophilic sheet 72 (outer layer sheet 52) are side edge portions thereof. Have the same shape, and the shape in the longitudinal direction (Y direction) is also the same shape. In the diaper 1D, as shown in FIGS. 12 and 13, the inner hydrophilic sheet 71 (inner layer sheet 51) and the outer hydrophilic sheet 72 (outer layer sheet 52) have a width direction (X direction) and a longitudinal direction (Y direction). ) In each case, they are intermittently joined to each other via the joint 15.

  In the disposable diaper 1D of the fourth embodiment, the waist elastic member 8 is stretched in the width direction (X direction) as shown in FIGS. It is arranged inside each of the waist flaps 6b of the part B. In the diaper 1 </ b> D, a plurality of thread-like elastic elastic members 8 having 2 to 30 threads form an inner layer sheet 51 (inner hydrophilic sheet 71) and an outer layer constituting the outer packaging material 5 as shown in FIGS. 12 and 13. It arrange | positions so that the junction part 15 may not be passed between the sheet | seats 52 (outer hydrophilic sheet | seat 72), and is arranged in parallel by the longitudinal direction (Y direction). Further, as shown in FIGS. 10, 12, and 13, each elastic waist member 8 of the fourth embodiment includes an inner layer sheet 51 (inner hydrophilic sheet 71) and an outer layer sheet 52 in both side seal portions 12 and 12. It is joined to the (outer hydrophilic sheet 72), and in the portions other than the side seal portions 12, 12, the inner layer sheet 51 (inner hydrophilic sheet 71) and the outer layer sheet 52 (outer hydrophilic sheet 72). It is not joined to. By the waist elastic member 8 arranged in this way, the waist flap 6a of the back side A including the inner hydrophilic sheet 71 (inner layer sheet 51) and the outer hydrophilic sheet 72 (outer layer sheet 52), and the ventral side part B A gather is formed on each of the waist flaps 6b.

  In the disposable diaper 1D of the fourth embodiment, as shown in FIG. 13, the joining portion 15 that joins the inner hydrophilic sheet 71 (inner layer sheet 51) and the outer hydrophilic sheet 72 (outer layer sheet 52) to each other is in the width direction. They are arranged in a row in each of the (X direction) and the longitudinal direction (Y direction). In the diaper 1D of the fourth embodiment, the joint portions 15 constituting the row in the width direction (X direction) and the elastic members 8 extended in the width direction (X direction) are alternately arranged in the longitudinal direction (Y direction). It is arranged in.

  In the disposable diaper 1D of the fourth embodiment, as shown in FIG. 12, the waist elastic member 8 contracts in the natural state (the state where no external force is applied), and the inner hydrophilic sheet 71 (inner layer sheet 51) and the outer side Each of the hydrophilic sheets 72 (outer layer sheets 52) forms a plurality of walls (ridges) 16 and 16 extending continuously over the plurality of waist elastic members 8, respectively.

  In the disposable diaper 1D of the fourth embodiment, as shown in FIG. 12, each heel 16 of each of the inner hydrophilic sheet 71 (inner layer sheet 51) and the outer hydrophilic sheet 72 (outer layer sheet 52) is outside. A convex curved surface having an arcuate cross section is formed at the tip of each ridge 16 in the protruding direction. As shown in FIG. 12, the convex curved surface continuously extends in the longitudinal direction (Y direction). In the disposable diaper 1D of 4th Embodiment, as shown in FIG. 12, every time between the junction parts 15 which comprise the row | line | column of a longitudinal direction (Y direction) adjacent to the width direction (X direction), a heel (畝) 16 is formed, and these ridges (畝) 16 are continuously divided in the longitudinal direction (Y direction) without being divided at a portion overlapping the elastic member 4. That is, as shown in FIG. 12, in a natural state (a state in which no external force is applied), the waist elastic member 8 contracts, and the joint portion 15 that forms a row in the longitudinal direction (Y direction) forms a groove 17. The grooves 17 and ridges 16 are alternately formed in the width direction (X direction).

  About the formation material of disposable diaper 1D of 4th Embodiment, it is the same as that of the underpants type disposable diaper 1A of 1st Embodiment, the underpants type disposable diaper 1B of 2nd Embodiment, or the underpants type disposable diaper 1C of 3rd Embodiment. . That is, the inner hydrophilic sheet 71 is the same as the inner layer sheet 51 constituting the outer packaging material 5, and the outer hydrophilic sheet 72 is the same as the outer layer sheet 52 constituting the outer packaging material 5. In addition, the joining part 15 may be formed by joining by heat sealing | fusion, and may be formed by joining by a hot-melt-type adhesive agent etc.

The effect at the time of using the disposable diaper 1D of 4th Embodiment of this invention mentioned above is demonstrated.
The disposable diaper 1D of the fourth embodiment has the same effects as the disposable diaper 1A of the first embodiment, the disposable diaper 1B of the second embodiment, or the disposable diaper 1C of the third embodiment. Hereinafter, effects different from the deployable disposable diaper 1A of the first embodiment, the disposable diaper 1B of the second embodiment, or the disposable diaper 1C of the third embodiment will be described.

  As shown in FIG. 12, the disposable diaper 1 </ b> D of the fourth embodiment has a waist flap 6 a on the back side A including the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72, and the ventral part B by the waist elastic member 8. Since each of the waist flaps 6b has gathers in which ridges (16) and grooves 17 are alternately formed in the width direction (X direction), the outer packaging material 5 has a soft feel and looks very good. Become beautiful.

  As shown in FIG. 12, the disposable diaper 1 </ b> D of the fourth embodiment has an inner layer sheet 51 (inner hydrophilic sheet 71) and an outer layer sheet 52 where the waist elastic member 8 is other than the side seal portions 12 and 12. Although not joined to the (outer hydrophilic sheet 72), the joining portion 15 constituting the longitudinal direction (Y direction) constitutes the groove 17, and the longitudinal direction in each groove 17 (Y direction). The inner hydrophilic sheet 71 (inner layer sheet 51) and the outer hydrophilic sheet 72 (outer layer sheet 52) are in contact with each other in a region D between the adjacent joint portions 15. Therefore, in the disposable diaper 1D of the fourth embodiment, in the region D between the joint portions 15 adjacent to each other in the longitudinal direction (Y direction) in each groove 17, the inner hydrophilic sheet 71 (inner layer sheet 51) is transferred. Sweat can be efficiently transferred to the outer hydrophilic sheet 72 (outer layer sheet 52), and sweat can be efficiently evaporated.

  The disposable diaper of the present invention is not limited to the disposable diaper 1A of the first embodiment, the disposable diaper 1B of the second embodiment, the disposable diaper 1C of the third embodiment, and the disposable diaper 1D of the fourth embodiment. Instead, it can be changed as appropriate.

  For example, in the disposable diaper 1A of the first embodiment described above, the disposable diaper 1B of the second embodiment, the disposable diaper 1C of the third embodiment, and the disposable diaper 1D of the fourth embodiment, the hydrophilic sheet 7 is shown in FIG. 6, 9, and 11, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are formed so as to be adjacent to each other, but the inner hydrophilic sheet 71 and the outer hydrophilic sheet are formed. Another water-permeable sheet may be interposed between the sheet 72 and the sheet 72.

  Further, in the disposable diaper 1A of the first embodiment described above, the outer hydrophilic sheet 72 is formed of two sheets of the same shape and the same size as shown in FIG. For example, the outer hydrophilic sheet 72 on the non-skin contact surface side of the two sheets may be larger.

  In the disposable diaper 1A of the first embodiment described above, the outer hydrophilic sheet 72 is formed of two sheets as shown in FIG. 2, and the two outer hydrophilic sheets 72 are either In addition, a liquid diffusibility higher than that of the inner hydrophilic sheet 71 (surface sheet 2) is used, but only one of the outer hydrophilic sheets 72 is more than the inner hydrophilic sheet 71 (surface sheet 2). Any material having a high liquid diffusibility may be used as long as liquid diffusibility is higher than that of the inner hydrophilic sheet 71 (surface sheet 2). The outer hydrophilic sheet 72 on the skin contact surface side may have a higher liquid diffusibility than the outer hydrophilic sheet 72 on the skin contact surface side.

  Moreover, in the disposable diaper 1A of the above-mentioned first embodiment, as shown in FIG. 3, the two outer hydrophilic sheets 72 have their constituent fibers oriented in the width direction (X direction) of the diaper 1A. However, none of them may be oriented in the width direction (X direction), and only one of the outer hydrophilic sheets 72 may be oriented in the width direction (X direction).

  Further, in the disposable diaper 1B of the second embodiment described above, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 constituting the hydrophilic sheet 7 are the same shape and size sheets as shown in FIGS. However, the sheet does not have to be the same shape and size.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

[Example 1]
Example 1 uses a hydrophilic air-through nonwoven fabric (25 g / m ² , length 60 mm × width 100 mm) made of PP / PE and PET / PE fibers as the inner hydrophilic sheet and PP fibers as the outer hydrophilic sheet. Two hydrophilic spunbonded nonwoven fabrics (10 g / m ² , 60 mm long × 120 mm wide) were used. Further, ten natural rubbers (470 dtex) were used as waist elastic members. In Example 1, an inner hydrophilic sheet is disposed on a flat surface, one of the outer hydrophilic sheets is disposed on the inner hydrophilic sheet, and stretched at a stretch ratio of 200% on one outer hydrophilic sheet. Ten other waist elastic members are juxtaposed at intervals of 5 mm, and the other outer hydrophilic sheet is arranged with these waist elastic members sandwiched therebetween, and one outer hydrophilic sheet is formed by an adhesive generally used for absorbent articles. The other outer hydrophilic sheet was adhered to the entire surface to create a gather.
The liquid diffusion area of each of the used inner hydrophilic sheet and outer hydrophilic sheet was measured by the method for measuring the liquid diffusion area. The obtained measured values are shown in Table 1. The measured value is an average value of n = 5.

[Example 2]
Example 2 uses a weakly hydrophilic spunbond nonwoven fabric (19 g / m ² , 60 mm long × 100 mm wide) made of PP fibers as the inner hydrophilic sheet, and hydrophilic SMMS made of PP fibers as the outer hydrophilic sheet. A gather was prepared in the same manner as in Example 1 except that (spun bond / melt blow / melt blow / spun bond) (10 g / m ² , vertical width 60 mm × horizontal width 120 mm) was used.
The liquid diffusion area of each of the used inner hydrophilic sheet and outer hydrophilic sheet was measured in the same manner as in Example 1. The obtained measured values are shown in Table 1. The measured value is an average value of n = 5.

Example 3
Example 3 is a concavo-convex shape hydrophilic air-through nonwoven fabric (36 g / m ² , longitudinal width 60 mm × 1) formed by processing a hydrophilic air-through nonwoven fabric made of PET / PE fibers as an inner hydrophilic sheet. A gather was prepared in the same manner as in Example 1 except that a hydrophilic spunbond nonwoven fabric (10 g / m ² , length 60 mm × width 120 mm) made of PP fibers was used as the outer hydrophilic sheet.
The liquid diffusion area of each of the used inner hydrophilic sheet and outer hydrophilic sheet was measured in the same manner as in Example 1. The obtained measured values are shown in Table 1. The measured value is an average value of n = 5.

[Comparative Example 1]
Comparative Example 1 uses a hydrophilic air-through nonwoven fabric (25 g / m ² , length 60 mm × width 100 mm) made of PP / PE and PET / PE fibers as the inner hydrophilic sheet, and from PP fibers as the outer hydrophilic sheet. A gather was prepared in the same manner as in Example 1 except that the water-repellent spunbond nonwoven fabric (15 g / m ² , vertical width 60 mm × horizontal width 120 mm) was used.
The liquid diffusion area of each of the used inner hydrophilic sheet and outer hydrophilic sheet was measured in the same manner as in Example 1. The obtained measured values are shown in Table 1. The measured value is an average value of n = 5.

[Comparative Example 2]
Comparative Example 2 uses a hydrophilic spunbond nonwoven fabric (10 g / m ² , 60 mm long × 100 mm wide) made of PP fibers as the inner hydrophilic sheet, and PP / PE and PET / PE as the outer hydrophilic sheets. A gather was prepared in the same manner as in Example 1 except that a hydrophilic air-through nonwoven fabric (25 g / m ² , vertical width 60 mm × horizontal width 120 mm) made of fibers was used.
The liquid diffusion area of each of the used inner hydrophilic sheet and outer hydrophilic sheet was measured in the same manner as in Example 1. The obtained measured values are shown in Table 1. The measured value is an average value of n = 5.

[Comparative Example 3]
Comparative Example 3 uses a hydrophilic air-through nonwoven fabric (25 g / m ² , length 60 mm × width 100 mm) made of PP / PE and PET / PE fibers as the inner hydrophilic sheet, and acetate as the outer hydrophilic sheet. A gather was prepared in the same manner as in Example 1 except that a hydrophilic web made of fibers (20 g / m ² , 60 mm long × 120 mm wide) was used.
The liquid diffusion areas of the inner hydrophilic sheet and the outer hydrophilic web used were measured in the same manner as in Example 1. The obtained measured values are shown in Table 1. The measured value is an average value of n = 5.

[Comparative Example 4]
Comparative Example 4 uses a hydrophilic air-through nonwoven fabric (30 g / m ² , length 60 mm × width 120 mm) made of PET / PE fibers as the inner hydrophilic sheet, and hydrophilic made of PET / PE fibers as the outer hydrophilic sheet. A gather was prepared in the same manner as in Example 1 except that the air-through nonwoven fabric (25 g / m ² , vertical width 60 mm × horizontal width 70 mm) was used.
The liquid diffusion area of each of the used inner hydrophilic sheet and outer hydrophilic sheet was measured in the same manner as in Example 1. The obtained measured values are shown in Table 1. The measured value is an average value of n = 5.

[Performance evaluation]
About the gather created by the Example and the comparative example, the diffusibility of the liquid was measured with the following method. The obtained results are shown in Table 1.

Using a measuring device (KES-F7 THERMO LABO II) manufactured by Kato Tech Co., the inner hydrophilic sheet side surface (corresponding to the skin contact surface side) of each gather of each Example and each Comparative Example, Table 1 In this case, the surface of the outer hydrophilic sheet side (corresponding to the non-skin contact surface side, and simply referred to as “outside” in Table 1) before water absorption ( Hereinafter, the maximum heat absorption rate qmax (kW / m ² ) value of “also referred to as drying” was measured. The obtained results are shown in Table 1. The measured value is an average value of n = 3.

Next, an acrylic plate (length 150 mm × width 150 mm) was placed on a horizontal plane, and the gathers of each example and each comparative example were placed on the acrylic plate. At that time, it should be noted that the inner hydrophilic sheet is disposed on the acrylic plate side. A weight of 1.0 kPa is placed on the center of the gathers of each example and each comparative example, that is, the center of the outer hydrophilic sheet on the side opposite to the acrylic plate, and the inner hydrophilicity of each gather of each example and each comparative example. 0.5 ml of water was injected between the adhesive sheet and the acrylic plate. After injecting water, the gathers of each example and each comparative example were stretched until the gathers stopped and then shrunk again to the original state. This action was continued 5 times. The inner hydrophilic sheet side surface (skin side) and the outer hydrophilic sheet side surface (outer side) of each of the examples and comparative examples after being expanded and contracted five times (hereinafter also referred to as water absorption expansion and contraction). ) Maximum heat absorption rate qmax (kW / m ² ) was measured. The obtained results are shown in Table 1. The measured value is an average value of n = 3.

Next, determine the difference Δqmax (kW / m ²⁾ value of the respective Examples and dry qmax (kW / m ²⁾ value qmax (kW / m ²⁾ value after gather each water expansion and contraction of the Comparative Examples It was. The obtained results are shown in Table 1.
Here, the qmax value is a peak value of a heat flow rate in which predetermined heat is stored in a heat plate having a constant area and a constant mass, and immediately after the heat is in contact with the sample surface, the stored heat amount is transferred to the low temperature side sample. The larger the qmax value, the higher the body temperature taken away during clothing and the higher the feeling of cool contact. In each of the examples and comparative examples in the present specification, the contact cooling sensation greatly depends on the amount of water that the injected water diffuses into each sheet. Therefore, if the sample in which the qmax value at the time of drying and the qmax value after water absorption expansion / contraction are the same, the larger the Δqmax (kW / m ² ) value, the greater the amount of moisture.

As apparent from the results shown in Table 1, in the gathering of Examples 1 to 3, towards the outer Δqmax (kW / m ²⁾ value is, the skin side Δqmax (kW / m ²⁾ larger than the value, It was found that the water injected into the inner hydrophilic sheet moved to the outer hydrophilic sheet. In contrast, in the gathers of Comparative Examples 1 to 4, contrary to the gathers of Examples 1 to 3, the Δqmax (kW / m ² ) value on the skin side is larger, and the water injected into the inner hydrophilic sheet is smaller. It was difficult to move to the outer hydrophilic sheet, and it was found that it remained in the inner hydrophilic sheet.
Accordingly, in the disposable diapers having the gathers of Examples 1 to 3, the sweat absorbed by the inner hydrophilic sheet easily moves to the outer hydrophilic sheet and is not easily moistened, so that it is difficult for the skin to be damaged. .

1A, 1B, 1C, 1D Disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 40 Absorbent body 41 Absorber longitudinal direction (Y direction) edge 5 Outer packaging material 51 Inner layer sheet 52 Outer layer sheet 520 Folded portion 6a, 6b Waist Flap 61 Longitudinal direction (Y direction) edge of waist flap 7 Hydrophilic sheet 71 Inner hydrophilic sheet 72 Outer hydrophilic sheet 8 Waist elastic member 9 Fastening tape 10 Leg flap 10a Elastic member 11 for leg gather formation 11 For three-dimensional guard formation Sheet 11a Elastic member 12 for forming a three-dimensional guard Side seal 13 Waist opening 14 Leg opening 15 Joint 16 Wall (Saddle)
17 Groove A dorsal side, B ventral side, C crotch lower part A1, B1 waist region

Claims (5)

A disposable diaper comprising an absorbent body in the center of the disposable diaper from the back side part to the abdominal side part, and a hydrophilic sheet is arranged on the waist flap,
The hydrophilic sheet has an inner hydrophilic sheet that forms a skin contact surface, and an outer hydrophilic sheet that is disposed on the non-skin contact surface side of the inner hydrophilic sheet. It is arranged in a waist region including a region between the edge of the waist flap on the back side and the edge of the absorber,
In the waist flap including the outer hydrophilic sheet and the inner hydrophilic sheet, a gather is formed by a waist elastic member disposed inside the waist flap in a state of extending in the width direction of the disposable diaper,
The outer hydrophilic sheet has its constituent fibers oriented in the width direction of the disposable diaper, and the inner hydrophilic sheet has its constituent fibers oriented in the longitudinal direction of the disposable diaper,
The outer hydrophilic sheet than said inner hydrophilic sheet, the diffusion of the liquid in the width direction of the disposable diaper rather high,
The outer hydrophilic sheet and the inner hydrophilic sheet extend in the longitudinal direction from the edge of the waist flap on the back side to the edge of the absorbent main body having the absorber, and further to the edge of the absorber. A disposable diaper extending beyond the absorbent body over the absorbent body . The waist elastic member is arranged between the inner hydrophilic sheet and the outer hydrophilic sheet so as not to pass through a joint portion that intermittently joins the inner hydrophilic sheet and the outer hydrophilic sheet. And
The joint portions are arranged in rows in the width direction and the longitudinal direction, respectively, and the inner hydrophilic sheet and the outer hydrophilic sheet are in contact with each other in a region between the joint portions adjacent in the longitudinal direction. And
The disposable diaper according to claim 1, wherein the outer hydrophilic sheet has higher transpiration than the inner hydrophilic sheet. The disposable diaper is a deployable disposable diaper,
The inner hydrophilic sheet forms a liquid-permeable surface sheet,
The outer hydrophilic sheet is composed of two sheets disposed between fastening tapes provided on both right and left side edges of the back side part,
The disposable diaper according to claim 1 or 2 , wherein the waist elastic member is disposed between the two outer hydrophilic sheets. The disposable diaper is a pants-type disposable diaper,
The inner hydrophilic sheet and the outer hydrophilic sheet are arranged in a width direction of the disposable diaper on a skin contact surface of a folded portion formed by folding an outer layer sheet constituting an outer packaging material of the disposable diaper in the waist region. provided that the disposable diaper according to claim 1 or 2 Ru Empire. The disposable diaper is a pants-type disposable diaper,
The inner hydrophilic sheet constitutes a folded portion formed by folding an outer layer sheet constituting an outer packaging material of a disposable diaper in the waist region,
The outer hydrophilic sheet, a disposable diaper according to claim 1 or 2 to form an inner layer sheet arranged on the skin contact surface side of the outer sheet.

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