TWI508715B - Absorbent items - Google Patents

Description

Absorbent article

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

Previously, it has been known to improve the evapotranspiration of sweat in the waist flaps (generally, from the portion of the absorbent body including the absorbent core toward the outer side in the longitudinal direction), and to prevent eczema, lice, and macules. A disposable diaper produced by the same. For example, Patent Document 1 discloses a disposable diaper in which a breathable sweat-absorbent sheet is joined to the inner surface of a waist flap. Further, Patent Document 2 discloses a disposable diaper in which a hydrophilic fibrous web is disposed on the inner surface of a waist flap, and the hydrophilic fibrous web has long fibers aligned in the width direction.

However, in the disposable diaper disclosed in Patent Document 1, the sweat-absorbent sheet is formed by the upper layer containing the hydrophilic fiber and the layer integrally formed with the upper layer and comprising the lower layer of the hydrophobic fiber, which is absorbed by the sweat-absorbing sheet. The sweat easily stays inside, so that the sweat-absorbing sheet easily becomes wet. If such a sweat-absorbent sheet is in contact with the skin of the wearer for a long period of time, there is a high possibility that a forceps are generated on the skin.

Further, in the disposable diaper disclosed in Patent Document 2, the waist flap has a structure of a hydrophobic outer layer sheet, a hydrophobic inner layer sheet, and an elastic member disposed between the sheets, and disposable urine The sheet is formed by disposing a tow-opened hydrophilic fibrous web on the hydrophobic inner sheet. In this case, since the hydrophilic fibrous web is formed of long fibers, the distance between the long fibers is increased by the shrinkage caused by the elastic members during use, and the sweat in the hydrophilic fibrous web is increased. The transferability is lowered, or the shrinkage by the elastic member upon repeated use, the long fibers are separated from each other, and it is difficult to follow the stretching, and the transferability of sweat in the hydrophilic fiber web is further lowered.

Patent Document 1: Japanese Patent Laid-Open Publication No. 2000-189454

Patent Document 2: Japanese Patent Laid-Open Publication No. 2006-141549

Therefore, the subject of the present invention relates to an absorbent article which improves the spread of sweat and prevents the occurrence of eczema, lice, macules and the like.

The present invention is a disposable diaper having an absorbent body at the center of the disposable diaper from the back side and the ventral portion, and a hydrophilic sheet disposed on the waist flap.

The hydrophilic sheet has an inner hydrophilic sheet which forms a skin contact surface, and an outer hydrophilic sheet which is disposed on the non-skin contact surface side of the inner hydrophilic sheet.

The inner hydrophilic sheet and the outer hydrophilic sheet are disposed in a waist region including a region between an end side of the waist flap and an end side of the absorber.

In the waist flap including the outer hydrophilic sheet and the inner hydrophilic sheet, wrinkles are formed by the waist elastic member, and the waist elastic member is stretched in the width direction of the disposable diaper. It is disposed inside the waist flap.

The outer hydrophilic sheet has higher liquid diffusibility than the inner hydrophilic sheet.

Hereinafter, a preferred first embodiment of the disposable diaper of the present invention will be described with reference to Figs. 1 to 3 .

As shown in Fig. 1 to Fig. 2, the disposable diaper 1A of the first embodiment (hereinafter also referred to as "diaper 1A") is a cross-side portion A located on the back side of the wearer when worn, and is located in the wearer. The ventral side B of the ventral side is provided in the center of the width direction of the disposable diaper (hereinafter referred to as "X direction". The X direction means a direction perpendicular to the center line CL extending in the longitudinal direction of the diaper 1A). The absorbent body 4 is formed by arranging the hydrophilic sheet 7 at the waist flaps 6a and 6b. As shown in FIG. 2, the hydrophilic sheet 7 has an inner hydrophilic sheet 71 that forms a skin contact surface, and an outer hydrophilic sheet 72 that is disposed on the non-skin contact surface side of the inner hydrophilic sheet 71. The outer hydrophilic sheet 72 has a higher liquid diffusibility than the inner hydrophilic sheet 71. As shown in FIGS. 1 to 2, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are disposed in the waist region A1, and the waist region A1 includes at least the end edge 61 of the waist flap 6a of the back side portion A and absorption. The area between the end edges 41 of the body 4. At the waist flap 6a including the outer hydrophilic sheet 72 and the inner hydrophilic sheet 71, wrinkles are formed by the waist elastic member 8, and the waist elastic member 8 is oriented along the width direction of the diaper 1A (X direction) The state of being stretched is placed inside the waist flap 6a.

As shown in Fig. 1, the diaper 1A is formed bilaterally symmetrically with respect to the center line CL. Therefore, in the following description, the portions on the right and left sides are mainly described with respect to the right side portion shown in FIG. 1.

When the diaper 1A is described in detail, as shown in Fig. 1, the diaper 1A is an unfolded disposable diaper having a back side A on the back side of the wearer when worn, and a belly on the ventral side of the wearer. The side portion B and the crotch portion C disposed between the back side portion A and the front side portion B. As shown in Fig. 1, the diaper 1A has a pair of left and right fastening tapes 9, 9 which are connected to the right and left side edges of the back side portion A. As shown in Fig. 1, the diaper 1A has a target tape (not shown) for fixing the fastening tape 9 on the outer surface of the abdominal side portion B.

Further, as shown in Fig. 1, the diaper 1A has a long shape in the same direction as the absorbent body 4 in a state of being expanded in a planar shape.

As shown in Fig. 1, the diaper 1A is a liquid permeable surface sheet 2, a liquid impervious or water repellent back sheet 3, and a liquid retaining property between the two sheets 2, 3. The absorber 4 is constructed. In the top sheet 2 and the back sheet 3, the both sides of the surface sheet 2 are in the longitudinal direction (hereinafter referred to as "Y direction". The Y direction is a direction parallel to the center line CL), that is, the diaper The area corresponding to the lower portion C of 1 is curved to form an hourglass shape that is indented toward the inner side in the width direction (X direction). As shown in Fig. 1, the surface sheet 2 and the back sheet 3 forming the outer surface of the diaper 1A are joined to each other and integrated. The absorber 4 also shapes the surface sheet 2 and the back sheet 3, and is bent in a region corresponding to the crotch portion C to form an hourglass shape that is indented inward in the width direction (X direction). Further, the absorber 4 is sandwiched between the topsheet 2 and the backsheet 3. These compositions are identical to those of the previously deployed disposable diapers.

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, as shown in FIGS. 1 and 2, in the diaper 1A, the top sheet 2 is the inner hydrophilic sheet 71.

In addition, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 which will be described later in the hydrophilic sheet 7 are in a state in which fibers are entangled, for example, non-woven fabric, and are not a web which does not entangle fibers. State.

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

As shown in Figs. 1 and 2, in the disposable diaper 1A of the first embodiment, the outer hydrophilic sheet 72 is disposed in the waist region A1 and the waist region B1, respectively, wherein the waist region A1 includes the back side portion A. An area between the end edge 61 of the waist flap 6a and the end edge 41 of the absorbent body 4, the waist region B1 comprising the end edge 61 of the waist flap 6b of the ventral side B and the end edge 41 of the absorbent body 4. region. As shown in FIGS. 1 and 2, the outer hydrophilic sheet 72 is disposed inside the waist flap 6a of the back side portion A and the waist flap 6b of the front side portion B, and specifically, is disposed on the inner hydrophilic sheet. Between the material 71 and the back sheet 3. In the width direction (X direction), the outer side hydrophilic sheet 72 on the back side A side spans the fastening tapes 9 and 9 which are respectively provided on the left and right side edges in the width direction (X direction) of the back side portion A. In the longitudinal direction (Y direction), the end edge 61 of the waist flap 6a from the back side A extends over the end edge 41 of the absorber 4 to the absorber 4. The outer side hydrophilic sheet 72 on the side of the front side B side has the same width and the same length as the outer side hydrophilic sheet 72 on the side of the back side A side.

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

<Method for Measuring Liquid Diffusion Area>

A sample of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 cut into 100 mm × 100 mm squares were placed on the acrylic plate, and 0.05 mL of the colored water was added thereto from above 30 mm. After 10 minutes, the diffusion area of the colored water was measured using an image analysis device. The larger the measured value obtained, the higher the diffusibility of the liquid.

As shown in Fig. 3, the two outer hydrophilic sheets 72 are oriented such that the constituent fibers are aligned in the width direction (X direction) of the diaper 1A. From the viewpoint of the diffusibility in the width direction (X direction) and the strength in the width direction (X direction), the alignment of the fibers is preferably 1 or more, more preferably 1.2 or more. The degree of orientation was measured using a Microwave molecular orientation analyzer (MOA-2001A) from KANZAKI. Each of the outer hydrophilic sheet 72 and the inner hydrophilic sheet 71 cut into a length of 100 mm × a width of 50 mm was used as a sample, and the average value of three points in each sample was measured as the degree of alignment.

Further, the inner hydrophilic sheet 71 (surface sheet 2) in the diaper 1A is aligned 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 6a of the back side portion A and the waist flap 6b of the front side portion B in a state of being stretched in the width direction (X direction). As shown in Figs. 1 and 2, in the disposable diaper 1A of the first embodiment, one to ten filament-shaped plurality of waist elastic members 8 are disposed between the two outer hydrophilic sheets 72 and 72. And intermittently arranged along the length direction (Y direction). The waist elastic member 8 thus disposed is formed on the waist flap 6a including the back side portion A of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72, and the waist flap 6b of the front side portion B, respectively. Wrinkles.

The stretch ratio of the waist elastic member 8 is preferably 150% to 300% from the viewpoint of no contact with the wearer's body and following the change of the posture or the expansion and contraction due to the change of the abdominal circumference caused by breathing or the like. More preferably, it is 200%~250%. Here, the stretch ratio refers to a value obtained by the following equation when the length at the time of non-stretching is A (mm) and the length at the time of stretching is B (mm).

Stretching ratio (%) = (B / A) × 100

As shown in Fig. 1, the top sheet 2 (the inner hydrophilic sheet 71) and the back sheet 3 extend outward in the width direction (X direction) from the left and right sides in the longitudinal direction (Y direction) of the absorber 4, respectively. The extended front sheet 2 and the extended back sheet 3 are joined to form a pair of left and right leg cuffs 10, 10. In the leg cuffs 10 and 10, one to five filament-shaped elastic gather members 10a for forming a leg gather are disposed, and the elastic wrinkle member 10a for forming a leg gather is composed of a front sheet 2 (inner hydrophilic sheet 71) and a back surface. The sheet 3 is clamped and fixed. Further, the elastically stretchable member 10a is contracted to form a leg gather at the lower portion C of the diaper 1A.

The three-dimensional protective forming sheets 11 and 11 are disposed on the left and right side portions in the longitudinal direction (Y direction) of the diaper 1A so as to cover the side portions of the surface sheet 2, respectively. Each of the three-dimensional protective forming sheets 11 is fixed to the surface sheet 2 in the specific width region of the side portions in the longitudinal direction (Y direction) and the side portions in the width direction (X direction), and is oriented in the width direction ( The inner side of the X direction is in a free state. The side portion of the sheet for forming the three-dimensional protective sheet in the width direction (X direction), that is, the side portion close to the center line CL has the elastic member 11a for forming a three-dimensional protective member, and by wearing the contraction force of the elastic member, The free state portion inside the width direction (X direction) of the sheet for forming the three-dimensional protective sheet rises, and the three-dimensional wrinkles are 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 surface sheet 2 (the inner hydrophilic sheet 71) and the outer hydrophilic sheet 72, a sheet material having hydrophilicity and absorbing moisture can be used. Here, the term "sheet material" means a state in which fibers are entangled except for a state in which the fibers are not entangled, for example, non-woven fabric. Further, the term "hydrophilic" includes both of the following: the fiber itself absorbs and retains moisture; and the person who absorbs and retains moisture by the space between the fibers. Examples thereof include a sheet of hydrophilic fibers; and a sheet obtained by hydrophilizing a hydrophobic fiber with an oil or the like. Specifically, a non-woven fabric (for example, a spunlace nonwoven fabric) containing a hydrophilic fiber such as cotton, crepe or pulp may be suitably used; or a non-woven fabric comprising a hydrophobic fiber such as polyethylene fiber or polypropylene fiber may be hydrophilic by an oil agent or the like. The treatment is obtained. The surface sheet 2 (the inner hydrophilic sheet 71) and the outer hydrophilic sheet 72 may each be a sheet containing a hydrophilic fiber and a sheet obtained by hydrophilizing a hydrophobic fiber. There is no limitation on the combination, but when it is worn for a long time in a state of excessive sweating, since the liquid retention of the sheet itself is low, it is preferable to maintain the dry feeling of the skin side for a longer period of time. The surface sheet 2 (the inner hydrophilic sheet 71) is obtained by hydrophilizing a hydrophobic fiber. The basis weight of the hydrophilic sheet 7 is determined in consideration of its water absorption capacity and the like. For example, when a sheet of hydrophilic fibers is used as the hydrophilic sheet 7, the basis weight of the surface sheet 2 (the inner hydrophilic sheet 71) is preferably from 10 to 100 g/m ² , more preferably from 20 to 60 g. /m ² . When a sheet of hydrophilic fibers is used, the basis weight of the outer hydrophilic sheet 72 is preferably from 10 to 80 g/m ² , more preferably from 10 to 60 g/m ² .

In order to improve the softness, the wrinkles of the waist elastic member 8 can be easily formed to form fine wrinkles, which reduces the discomfort given to the wearer when in contact with the skin, and the sweat accumulated in the gaps between the fibers by the wrinkles. From the viewpoint of being stretched and easily transferred to the outer hydrophilic sheet 72, it is preferred that the inner hydrophilic sheet 71 is more easily compressed and deformed than the outer hydrophilic sheet 72. The term "compressible deformation" means a sheet which is extremely easy to compress and compress in the thickness direction.

From the viewpoint of rapidly transferring sweat from the skin contact surface side to the non-skin contact surface side by capillary force, it is preferred that the outer hydrophilic sheet 72 is used at a higher density than the inner hydrophilic sheet 71. . When a sheet of hydrophilic fibers is used as the hydrophilic sheet 7, the density of the outer hydrophilic sheet 72 is preferably from 0.05 to 0.3 g/cm ³ , more preferably from 0.1 to 0.2 g/cm ³ . When a sheet of hydrophilic fibers is used, the density of the surface sheet 2 (the inner hydrophilic sheet 71) is preferably from 0.01 to 0.2 g/cm ³ , more preferably from 0.02 to 0.1 g/cm ³ .

From the viewpoint of preventing the sweat transferred from the skin contact surface side from flowing back, and the outer hydrophilic sheet 72 evaporating the body fluid, it is preferred that the outer hydrophilic sheet 72 is used for evapotranspiration as compared with the inner hydrophilic sheet 71. Higher sex. The evaporability of the liquid is measured by the following method for measuring the liquid evaporability.

<Method for measuring liquid evapotranspiration>

0.2 g of distilled water was sprayed 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 square is placed on the distilled water sprayed, and is used in a constant temperature environment at a temperature of 20 ° C and a humidity of 65% RH. The change in weight is used to determine the amount of distilled water evapotranspiration. The amount of distilled water after 10 minutes (the weight of the sample containing distilled water after 10 minutes - the original weight of the sample) was divided by the initial distilled water (0.2 g), and the ratio was taken as the value of liquid evaporability. The measured value is the average of n=3.

The back sheet 3, the absorbent body 4, and the sheet 11 for forming a three-dimensional protection for forming a pair of three-dimensional protection sheets can be used without any particular limitation as long as they are generally used for absorbent articles such as disposable diapers. For example, as the back sheet 3, a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. As the absorber 4, a fiber aggregate of a fiber material such as pulp or a superabsorbent polymer carried thereon may be used as a coating material such as a tissue paper or a water-permeable nonwoven fabric. As the sheet for forming a three-dimensional protective sheet, 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 protective forming elastic member 11a are not particularly limited as long as they are generally used for absorbent articles such as disposable diapers. For example, polyethylene-alpha olefin copolymers including natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, ethyl acrylate-ethylene, and the like can be used. a stretchable material such as a material.

The hook surface material forming the fastening tape 9 can be used without any particular limitation as long as it is generally used for absorbent articles such as disposable diapers. For example, as a hook material, "Magic-Tape (registered trademark)" (manufactured by Kuraray Co., Ltd.), "Quicklon (registered trademark)" (manufactured by YKK), and "Magicloth (registered trademark)" (Kanebo) can be used. Public components, etc. manufactured by Bell-Touch Co., Ltd.). As the target tape, a matte material having a surface structure capable of being fastened to the engaging projection of the hook surface material is used. As the matte material, the hook surface material can be fixed by pressing the hook surface material without any particular limitation. By. For example, a mother member such as the above-described various known mechanical hook faces and hook-and-loop fasteners can be used. Further, a material that can be directly engaged with the engaging projection of the hook surface material, for example, a non-woven fabric having a fastening property, may constitute the outer surface of the abdominal portion B (the non-skin contact surface of the back sheet 3).

Next, the action and effect when the diaper 1A of the first embodiment of the present invention is used will be described.

As shown in Fig. 1 and Fig. 2, the diaper 1A has a hydrophilic sheet 7 on the skin contact surface of the waist flaps 6a, 6b which are prone to eczema, lice, rashes, etc. (the inner hydrophilic sheet forming the skin contact surface) The material 71 and the outer hydrophilic sheet 72) disposed on the non-skin contact surface side of the inner hydrophilic sheet 71 can transfer the sweat of the wearer to the inner hydrophilic sheet 71. As shown in Fig. 1, the diaper 1A is formed with wrinkles by the waist elastic member 8 at the waist flaps 6a, and is often stretched and contracted by the wearer's breathing or walking motion, and is easily transferred to the inner side by the expansion and contraction. The sweat of the sheet 71 is transferred to the outer hydrophilic sheet 72. The hydrophilic sheet 72 on the outer side of the diaper 1A has a higher liquid diffusibility than the inner hydrophilic sheet 71, so that the sweat transferred to the outer hydrophilic sheet 72 can be rapidly diffused. As a result, it is difficult to cause the sweat to stay on the inner hydrophilic sheet 71 forming the skin contact surface of the waist flaps 6a, 6b, and the inner hydrophilic sheet The material 71 is not easily changed to a wet state, so that eczema, lice, macules, and the like can be prevented from occurring. Further, since the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 of the diaper 1A are both sheets, it is difficult to change the distance between the constituent fibers due to the expansion and contraction of the wrinkles caused by the breathing or walking movement of the wearer. Since the transferability of sweat from the inner hydrophilic sheet 71 to the outer hydrophilic sheet 72 is not easily lowered, the effect of preventing the occurrence of eczema, lice, rash, and the like can be maintained.

Further, as shown in Fig. 3, in the diaper 1A, the constituent fibers of the two outer hydrophilic sheets 72 are aligned in the width direction (X direction) of the diaper 1A, so that the liquid diffusibility is higher, so that the transfer can be performed. The sweat to the outer hydrophilic sheet 72 spreads more rapidly. As a result, it is difficult to cause the sweat to stay on the inner hydrophilic sheet 71 forming the skin contact surface of the waist flap 6, and the inner hydrophilic sheet 71 is less likely to become wet, thereby preventing eczema, lice, and macules. And so on.

Next, the disposable diaper according to the second embodiment of the present invention will be described with reference to Figs. 4 to 7 .

The disposable diaper 1B of the second embodiment will be mainly described with respect to the disposable diaper 1A of the first embodiment. In the same manner as the disposable diaper 1A of the first embodiment, the description of the disposable diaper 1A of the first embodiment can be suitably applied.

As shown in Fig. 4 and Fig. 5, the disposable diaper 1B (hereinafter also referred to as "diaper 1B") of the second embodiment is a pant-type disposable diaper. The inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 of the diaper 1B are disposed on the skin contact surface of the folded portion 520 along the width direction (X direction) of the diaper 1B, and the folded portion 520 constitutes the diaper 1B. Outer packaging material 5 outer layer sheet 52 at the waist of the back side A The portion A1 is folded back to form. The waist elastic member 8 of the diaper 1B 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.

The disposable diaper 1B of the second embodiment is characterized in that the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are a sheet constituting the outer covering material 5 and a sheet constituting the absorbent body 40 to be described later. Different sheets.

As will be described in detail with respect to the diaper 1B, as shown in FIGS. 5 and 6, the diaper 1B includes an absorbent body 40 having a surface sheet 2, a back sheet 3, and two sheets 2, 3 The absorbent body 4; and the outer covering material 5 extending across the entire outer surface of the absorbent body 40 and located on the non-skin contact surface side of the absorbent body 40 to engage and fix the absorbent body 40; and the outer packaging material 5 The both side edges of the back side portion A and the both side edges of the front side portion B are joined to each other by a known joining method such as heat sealing, high-frequency sealing, or ultrasonic sealing to form the side seal portions 12 and 12 (refer to Figure 4). Thereby, as shown in FIG. 4, the waist opening portion 13 and the pair of leg opening portions 14, 14 are formed in the diaper 1B. Further, a crotch portion C is formed between the back side portion A and the front side portion B.

As shown in Fig. 5, the absorbent body 40 is formed in a vertically long rectangular shape and has its longitudinal direction (Y direction) aligned with the longitudinal direction (Y direction) of the diaper 1B, and is traversed from the back side A of the diaper 1B. The form of the front side portion B is joined to the central portion in the width direction (X direction) of the outer casing member 5. As shown in Fig. 5, the three-dimensional protective forming sheets 11 and 11 are disposed on the right and left side portions of the absorbent body 40, and the three-dimensional protective forming elastic members 11a are disposed in an extended state on each of the three-dimensional protective forming sheets 11 The side portions on the inner side in the width direction (X direction) form a three-dimensional gather on the left and right side portions of the absorbent body 40 by the contraction force of the elastic member 11a when worn.

As shown in Fig. 6, the outer covering material 5 contains two sheets. Specifically, the outer covering material 5 includes a laminate of the outer layer sheet 52 and the inner layer sheet 51. The outer sheet 52 forms the outermost surface of the diaper 1B. The inner layer sheet 51 is disposed adjacent to the outer layer sheet 52 and disposed on the inner surface side of the diaper 1B. As shown in Fig. 5, the inner layer sheet 51 and the outer layer sheet 52 have the same shape of the side portions, but the shapes in the longitudinal direction (Y direction) are different. Specifically, as shown in FIG. 6 , the outer layer sheet 52 has an extending portion that extends in the front-rear direction from the front and rear end sides of the inner layer sheet 51 in the longitudinal direction (Y direction). The extension portion of each outer layer sheet 52 is folded back to the absorbent body 40 so as to cover the front end of the absorbent body 40 after the absorbent body 40 is disposed and fixed to the inner layer sheet 51 of the outer packaging material 5. On the side, a folded portion 520 is formed (see Fig. 6). As shown in FIG. 5, the free end side of the folded portion 520 extends to the leg opening portion, that is, to the position covering the entire region of the side seal portion 12, and reaches the absorbent body 4. In this manner, the front end sides 41 and 41 of the self-absorbent body 4 are respectively extended in the front-rear direction, and the waist flaps 6a and 6b are formed on the diaper 1B (see FIG. 6).

As shown in Figs. 5 and 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. The skin contact surface of the folded portion 520 on the side of the back side A is disposed in the width direction (X direction). The inner hydrophilic sheet 71 of the diaper 1B is disposed on the skin contact surface of the outer hydrophilic sheet 72. As shown in Figs. 5 and 6, in the diaper 1B, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are disposed in the waist region A1, and the waist region A1 includes the end of the waist flap 6a of the back side portion A. The area between the side 61 and the end edge 41 of the absorbent body 4. As shown in FIGS. 5 and 6, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are wider in the width direction (X direction) than the width of the absorbent body 40 and narrower than the side seal portions 12, 12. The way of the interval extends.

As shown in FIGS. 5 and 6, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 extend in the longitudinal direction (Y direction) from the end edge 61 of the waist flap 6a of the back side portion A to no more than the folded portion. Up to the area of the free end of 520. As a result, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 overlap each other in the folded portion 520 and do not exceed the free end of the folded portion 520, whereby the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 is not in contact with the surface sheet 2, respectively, and it is possible to prevent the excreted urine or feces from infiltrating into the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72.

When the disposable diaper 1B of the second embodiment is used for, for example, an infant, as shown in Figs. 5 and 6, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are in the longitudinal direction (Y direction) from the back side. The end edge 61 of the waist flap 6a of the portion A passes over the end edge of the absorbent body 40, and then passes over the end edge 41 of the absorbent body 4 to extend onto the absorbent body 4. When the disposable diaper 1B of the second embodiment is used for, for example, an adult, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are flapped from the waist of the back side A in the longitudinal direction (Y direction). The end edge 61 of 6a extends to the vicinity of the end edge of the absorbent body 40. In this way, when the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 do not overlap with the absorbent body 40, respectively, the urine temporarily absorbed by the absorbent body 40 is oozing out to the inner hydrophilic sheet. The material 71 and the outer hydrophilic sheet 72. Therefore, it is more effective to add the wearer's own weight to the bed when the urine is absorbed to the end of the absorbent body 40.

As shown in Fig. 3 and Fig. 7, both the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 of the disposable diaper 1B of the second embodiment are aligned in the width direction (X direction) of the diaper 1B. . From the viewpoint of rapidly transferring sweat from the skin contact surface side to the non-skin contact surface side by capillary force, it is preferred that the outer hydrophilic sheet 72 is used at a higher density than the inner hydrophilic sheet 71. (See Figures 3 and 7).

As shown in Fig. 6, in the disposable diaper 1B of the second embodiment, the waist elastic member 8 is disposed in the width direction (X direction) and is disposed on the waist flap 6a and the ventral portion of the back side portion A. The inside of the waist flap 6b of B. As shown in Fig. 5 and Fig. 6, in the disposable diaper 1B of the second embodiment, one to 30 filament-shaped plurality of waist elastic members 8 are disposed on the inner layer sheet 51 constituting the outer covering material 5. It is intermittently arranged with the outer layer sheet 52 and in the longitudinal direction (Y direction). The waist elastic member 8 disposed as described above is disposed at the waist flap 6a including the back side portion A of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72, and the waist flap 6b of the front side portion B. Do not form folds.

The material for forming the disposable diaper 1B of the second embodiment will be described.

The pants-type disposable diaper 1B of the second embodiment will be described with respect to the pants-type disposable diaper 1A of the first embodiment. The aspect which is not particularly described is the same as that of the pants-type disposable diaper 1A of the first embodiment.

As the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72, a sheet material which is hydrophilic and absorbs and retains moisture is used. As an example, a sheet of hydrophilic fibers is mentioned. As the hydrophilic sheet 7 of the diaper 1B, a separate inner hydrophilic sheet 71 and an outer hydrophilic sheet can be used by a known joining method such as an adhesive, heat sealing, high-frequency sealing, or ultrasonic sealing. 72 sheets joined together and integrated.

The outer layer sheet 51 and the inner layer sheet 52 which constitute the outer covering material 5 are not particularly limited as long as they are generally 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 is used, the same effects as those of the disposable diaper 1A of the first embodiment can be obtained.

Next, the disposable diaper according to the third embodiment of the present invention will be described with reference to Figs.

The disposable diaper 1C of the third embodiment is different from the disposable diaper 1A of the first embodiment or the disposable diaper 1B of the second embodiment. In the same manner as the disposable diaper 1A of the first embodiment or the disposable diaper 1B of the second embodiment, the disposable diaper 1A of the first embodiment or the disposable type of the second embodiment can be suitably applied. Description of diaper 1B.

The disposable diaper 1C (hereinafter also referred to as "diaper 1C") of the third embodiment is a pant-type disposable diaper (see Figs. 4 and 8) similarly to the diaper 1B. As shown in Fig. 9, the inner hydrophilic sheet 71 constitutes a folded portion 520 which is an outer layer sheet 52 of the outer covering material 5 constituting the diaper 1C in the waist region A1 and the ventral side of the back side portion A, respectively. The waist region B1 of the portion B is folded back to form. As shown in FIG. 9, the outer hydrophilic sheet 72 forms the inner layer sheet 51, and the inner layer sheet 51 is 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.

The disposable diaper 1C of the third embodiment is different from the disposable diaper 1B of the second embodiment in that the inner hydrophilic sheet 71 is an outer layer sheet 52 constituting the outer covering material 5. In the folded portion 520, the outer hydrophilic sheet 72 is the inner layer sheet 51 constituting the outer covering material 5.

When the diaper 1C is described in detail, as shown in FIGS. 8 and 9, the diaper 1C has the outer packaging material 5 extending over the entire outer surface of the absorbent body 40. As shown in FIGS. 8 and 9, the outer covering material 5 includes a laminate of the outer layer sheet 52 and the inner layer sheet 51. The outer sheet 52 forms the outermost surface of the diaper 1C. The inner layer sheet 51 is disposed adjacent to the outer layer sheet 52 and disposed on the inner surface side of the diaper 1C. In the disposable diaper 1C of the third embodiment, the inner sheet 51 is the outer hydrophilic sheet 72.

As shown in Fig. 8, the inner layer sheet 51 (outer hydrophilic sheet 72) has the same shape as the outline of the side portions of the outer layer sheet 52, but has a different shape in the longitudinal direction (Y direction). Specifically, as shown in FIG. 9 , the outer layer sheet 52 has an extending portion extending in the front-rear direction from the longitudinal direction (Y direction) of the inner layer sheet 51 (the outer side hydrophilic sheet 72 ). The extension portion of each outer layer sheet 52 is disposed on the inner layer sheet 51 (outer hydrophilic sheet 72) of the outer packaging material 5 after the absorbent body 40 is disposed to cover the front end of the absorbent body 40. The method is folded back to the side of the absorbent body 40 to form a folded portion 520 (see FIG. 9). In the disposable diaper 1C of the third embodiment, the folded portion 520 is the inner hydrophilic sheet 71. The free end sides of the folded portion 520 (the inner hydrophilic sheet 71) respectively pass over the absorbent body from the end side 61 of the waist flap 6a of the back side A and the end edge 61 of the waist flap 6b of the front side B, respectively. The front and rear ends of the 40, respectively, and the front and rear ends 41 of the absorber 4 are respectively extended to the absorber 4 (see Figs. 8 and 9).

As shown in Fig. 8, in the disposable diaper 1C of the third embodiment, the waist elastic member 8 is disposed in the width direction (X direction) and is disposed on the waist flap 6a and the ventral portion of the back side portion A. The inside of each of the waist flaps 6b of B. As shown in Fig. 8 and Fig. 9, in the disposable diaper 1C of the third embodiment, one to 30 filament-shaped plurality of waist elastic members 8 are disposed on the inner layer sheet 51 constituting the outer covering material 5. The (outer hydrophilic sheet 72) and the outer layer sheet 52 are intermittently arranged in the longitudinal direction (Y direction). The lumbar elastic member 8 thus disposed is included in the waist portion including the inner hydrophilic sheet 71 (the folded portion 520 of the outer layer sheet 52) and the back side portion A of the outer hydrophilic sheet 72 (the inner layer sheet 51). Wrinkles are formed in the flap 6a and the waist flap 6b of the ventral side B, respectively.

The material for forming the disposable diaper 1C of the third embodiment is the same as the pants-type disposable diaper 1A of the first embodiment or the pants-type disposable diaper 1B of the second embodiment. That is, the inner hydrophilic sheet 71 is the same as the outer layer sheet 52 constituting the outer covering material 5, and the outer hydrophilic sheet 72 is the same as the inner layer sheet 51 constituting the outer covering material 5.

The action and effect when the disposable diaper 1C of the third embodiment of the present invention is used will be described.

The disposable diaper 1C of the third embodiment can obtain 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 those of the unfolded 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 has a smaller number of components than the diaper 1A and the diaper 1B, the waist flap 6a of the back side portion A and the waist flap 6b of the ventral side portion B are respectively The resulting folds are finer, which improves the feel of the skin.

The disposable diaper 1C of the third embodiment is less than the number of components of the diaper 1A and the diaper 1B, so that the waist flap 6a of the back side portion A and the waist flap 6b of the ventral side portion B are kept warm. The sex is lower, and the wearer will not sweat easily.

Next, a disposable diaper according to a fourth embodiment of the present invention will be described with reference to Figs.

The disposable diaper 1D of the fourth embodiment is different from 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. The aspect is explained. 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 are the same as those of the disposable diaper 1C of the third embodiment, and the disposable embodiment of the first embodiment is suitably applied. Description of the diaper 1A, the disposable diaper 1B of the second embodiment, or the disposable diaper 1C of the third embodiment.

The disposable diaper 1D (hereinafter also referred to as "diaper 1D") of the fourth embodiment is a pant-type disposable diaper (see FIGS. 4 and 10) similarly to the diaper 1B and the diaper 1C. As shown in Fig. 11, the inner hydrophilic sheet 71 is an outer layer material 51 constituting the diaper 1D and disposed on the skin contact surface side, and the outer hydrophilic sheet 72 is outside the diaper 1D. The packaging material 5 and the outermost surface sheet 52 of the diaper 1D are formed. As shown in FIG. 11, the waist elastic member 8 is disposed between the inner hydrophilic sheet 71 (the inner layer sheet 51) and the outer hydrophilic sheet 72 (the 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 characterized in that the inner hydrophilic sheet 71 is The inner layer sheet 51 constituting the outer covering material 5 and the outer side hydrophilic sheet 72 constitute the outer layer sheet 52 constituting the outer covering material 5.

As shown in Fig. 10 and Fig. 11, in the disposable diaper 1D of the fourth embodiment, the inner hydrophilic sheet 71 (the inner layer sheet 51) and the outer hydrophilic sheet 72 (the outer layer sheet 52) are The contours of the side portions are formed in the same shape, and the shapes in the longitudinal direction (Y direction) are also formed in the same shape. As shown in FIGS. 12 and 13, in the diaper 1D, the inner hydrophilic sheet 71 (the inner layer sheet 51) and the outer hydrophilic sheet 72 (the outer layer sheet 52) are respectively in the width direction (X direction) and The longitudinal direction (Y direction) is intermittently joined to each other via the joint portion 15.

As shown in Fig. 10 and Fig. 11, in the disposable diaper 1D of the fourth embodiment, the waist elastic member 8 is disposed in the width direction (X direction) and is disposed on the waist flap 6a of the back side portion A and The inside of each of the waist flaps 6b of the ventral portion B. As shown in FIG. 12 and FIG. 13, in the diaper 1D, two to 30 filament-shaped plurality of waist elastic members 8 are disposed on the inner layer constituting the outer covering material 5 so as not to pass through the joint portion 15. 51 (the inner hydrophilic sheet 71) and the outer layer sheet 52 (the outer hydrophilic sheet 72) are intermittently arranged in the longitudinal direction (Y direction). Further, as shown in Figs. 10, 12, and 13, the waist elastic members 8 of the fourth embodiment are combined with the inner layer sheet 51 (the inner hydrophilic sheet 71) and the outer layer in the both side seal portions 12 and 12. The sheet 52 (outer hydrophilic sheet 72) is joined, and the inner layer sheet 51 (the inner hydrophilic sheet 71) and the outer layer sheet 52 are not bonded to the portions other than the side seal portions 12 and 12 (outer hydrophilicity) Sheet 72) is joined. The waist elastic member 8 thus disposed is disposed on the waist flap 6a including the back side portion A of the inner hydrophilic sheet 71 (the inner layer sheet 51) and the outer hydrophilic sheet 72 (the outer layer sheet 52), Wrinkles are formed at the waist flaps 6b of the ventral side B, respectively.

As shown in Fig. 13, in the disposable diaper 1D of the fourth embodiment, the inner hydrophilic sheet 71 (the inner layer sheet 51) and the outer hydrophilic sheet 72 (the outer layer sheet 52) are joined to each other. The portions 15 are arranged in the width direction (X direction) and the longitudinal direction (Y direction) in a row. In the diaper 1D of the fourth embodiment, the joint portion 15 constituting the row in the width direction (X direction) and the elastic member 8 extending in the width direction (X direction) are alternately arranged in the longitudinal direction (Y direction).

As shown in Fig. 12, in the disposable diaper 1D of the fourth embodiment, the waist elastic member 8 is contracted in a natural state (a state in which no external force is applied), and the inner hydrophilic sheet 71 (inner layer sheet 51) The outer hydrophilic sheet 72 (outer layer sheet 52) is formed with a plurality of pleats (ribs) 16, 16 extending continuously across the plurality of waist elastic members 8.

As shown in Fig. 12, in the disposable diaper 1D of the fourth embodiment, the respective inner pleats of the inner hydrophilic sheet 71 (the inner layer sheet 51) and the outer hydrophilic sheet 72 (the outer layer sheet 52) are The ribs 16 are formed so as to protrude outward, and a convex curved surface having an arc shape in cross section is formed at an end portion of each pleat (rib) 16 in a protruding direction. As shown in FIG. 12, the convex curved surface continuously extends in the longitudinal direction (Y direction). As shown in Fig. 12, in the disposable diaper 1D of the fourth embodiment, the joint portions 15 which are adjacent to each other in the width direction (X direction) and which constitute the longitudinal direction (Y direction) are mutually The pleats (ribs) 16 are formed, and the pleats (ribs) 16 are not cut at a portion overlapping the waist elastic member 8, but continuously extend in the longitudinal direction (Y direction). That is, as shown in Figure 12, in the natural state (not applied) In the state in which the external force is applied, the waist elastic member 8 is contracted, and the joint portion 15 constituting the row in the longitudinal direction (Y direction) constitutes the groove 17, and the groove 17 and the pleats (ribs) 16 are alternately formed in the width direction (X direction). .

The material for forming the disposable diaper 1D of the fourth embodiment is the unfolded disposable diaper 1A of the first embodiment, the pants-type disposable diaper 1B of the second embodiment, or the pants of the third embodiment. The disposable diaper 1C is the same. That is, the inner hydrophilic sheet 71 is the same as the inner layer sheet 51 constituting the outer covering material 5, and the outer hydrophilic sheet 72 is the same as the outer layer sheet 52 constituting the outer covering material 5. Further, the joint portion 15 may be formed by joining by heat fusion, or may be formed by joining by a hot melt type adhesive or the like.

The effect of the disposable diaper 1D of the fourth embodiment of the present invention will be described.

The disposable diaper 1D of the fourth embodiment can obtain 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 those of the unfolded 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 1D of the fourth embodiment is composed of the waist elastic member 8 and the waist flap 6a including the back side portion A of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72, And the waist flaps 6b of the front side B have wrinkles, and the pleats (ribs) 16 and the grooves 17 are alternately formed in the width direction (X direction), so that the touch of the outer covering material 5 becomes It is soft and the appearance is very beautiful.

As shown in Fig. 12, in the disposable diaper 1D of the fourth embodiment, the waist elastic member 8 is not in contact with the inner layer sheet 51 (the inner hydrophilic sheet 71) in portions other than the side seal portions 12 and 12. The outer layer sheet 52 (the outer side hydrophilic sheet 72) is joined, but the groove 17 is formed in the joint portion 15 constituting the row in the longitudinal direction (Y direction), and is adjacent to each other in the longitudinal direction (Y direction) of the groove 17. In the region D between the joint portions 15, the inner hydrophilic sheet 71 (the inner layer sheet 51) and the outer hydrophilic sheet 72 (the outer layer sheet 52) are in contact with each other. Therefore, in the disposable diaper 1D of the fourth embodiment, the region D between the adjacent joining portions 15 in the longitudinal direction (Y direction) of each groove 17 can be transferred to the inner hydrophilic sheet. The sweat of 71 (inner layer sheet 51) is efficiently transferred to the outer hydrophilic sheet 72 (outer layer sheet 52), so that sweat can be efficiently evaded.

The disposable diaper of the present invention is not discarded by 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 embodiment of the fourth embodiment. Any limitation of the diaper 1D can be changed as appropriate.

For example, as shown in Fig. 2, Fig. 6, Fig. 9, and Fig. 11, the disposable diaper 1A of the first embodiment, the disposable diaper 1B of the second embodiment, and the disposable diaper of the third embodiment are shown. In the disposable diaper 1D of the 1C and the fourth embodiment, the hydrophilic sheet 7 is disposed such that the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are adjacent to each other, but the inner hydrophilic sheet is formed on the inner side. Between 71 and the outer hydrophilic sheet 72, other sheets having water permeability may also be present.

Further, as shown in Fig. 2, in the disposable diaper 1A of the first embodiment, the outer hydrophilic sheet 72 is formed of two sheets of the same shape and the same size, but the two sheets may not be the same. The shape of the same shape may be, for example, two sheets of the sheet, and the outer hydrophilic sheet 72 on the non-skin contact surface side is large.

Further, as shown in Fig. 2, in the disposable diaper 1A of the first embodiment, the outer hydrophilic sheet 72 is formed of two sheets, and the two outer hydrophilic sheets 72 and the inner hydrophilic sheet 71 are formed. (The surface sheet 2) is higher in diffusibility than liquid, but only one piece of the outer hydrophilic sheet 72 is more diffusible than the inner hydrophilic sheet 71 (surface sheet 2). When the two outer hydrophilic sheets 72 and the inner hydrophilic sheet 71 (surface sheet 2) are more diffuse than the liquid, the non-skin contact surface is used in the two sheets. The side outer hydrophilic sheet 72 may have a higher liquid diffusibility than the outer side hydrophilic sheet 72 on the skin contact surface side.

Further, as shown in Fig. 3, in the disposable diaper 1A of the first embodiment, the two outer hydrophilic sheets 72 are aligned in the width direction (X direction) of the diaper 1A. None of them may be aligned in the width direction (X direction), or only one of the outer hydrophilic sheets 72 may be aligned in the width direction (X direction).

Further, as shown in Figs. 5 and 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 have the same shape and the same size. Sheet, but it may not be the same size sheet.

Example

Hereinafter, the present invention will be specifically described by way of Examples, but the present invention is not limited to the Examples.

[Example 1]

Example 1 uses a hydrophilic hot air non-woven fabric comprising PP/PE (polypropylene/polyethylene) and PET/PE (polyethylene terephthalate/polyethylene) fibers (25). g/m ² , width 60 mm × width 100 mm) As the inner hydrophilic sheet, two hydrophilic spunbond nonwoven fabrics containing PP fibers (10 g/m ² , width 60 mm × width 120 mm) were used. As the outer hydrophilic sheet. Further, 10 natural rubbers (470 dtex) were used as the waist elastic members. In the first embodiment, the inner hydrophilic sheet is disposed on the flat surface, and one outer hydrophilic sheet is disposed on the inner hydrophilic sheet, and the outer hydrophilic sheet is stretched to the stretch at intervals of 5 mm. 10 pieces of waist elastic members having a magnification of 200%, and another outer hydrophilic sheet is disposed by sandwiching the waist elastic members, and one sheet of the outer hydrophilic sheet and the other sheet are generally used for the adhesive of the absorbent article The outer hydrophilic sheet is completely followed, thereby making wrinkles.

The liquid diffusion area of each of the inner hydrophilic sheet and the outer hydrophilic sheet used was measured by the above-described method for measuring the liquid diffusion area. The measured values obtained are shown in Table 1. The measured value is the average of n=5.

[Embodiment 2]

Example 2 was carried out using a weak hydrophilic spunbonded nonwoven fabric (19 g/m ² , a width of 60 mm × a width of 100 mm) containing PP fibers as an inner hydrophilic sheet, and using a hydrophilic SMMS containing PP fibers ( Spunbond/melt blown/melt blown/spunbond) (spunbond/meltblown/meltblown/spunbond) (10 g/m ² , width 60 mm × width 120 mm) as the outer hydrophilic sheet, The pleats were made in the same manner as in Example 1.

The liquid diffusion areas of the inner hydrophilic sheet and the outer hydrophilic sheet used were measured in the same manner as in the first embodiment. The measured values obtained are shown in Table 1. The measured value is the average of n=5.

[Example 3]

In the third embodiment, a hydrophilic hot air non-woven fabric (36 g/m ² , a width of 60 mm × a width of 100 mm) which imparts a concavo-convex shape to the uneven shape by processing a hydrophilic hot air non-woven fabric containing PET/PE fibers is used as the inner side. A hydrophilic sheet and a hydrophilic spunbonded nonwoven fabric (10 g/m ² , width 60 mm × width 120 mm) containing PP fibers were used in the same manner as in Example 1 except that the outer hydrophilic sheet was used. Wrinkled.

The liquid diffusion areas of the inner hydrophilic sheet and the outer hydrophilic sheet used were measured in the same manner as in the first embodiment. The measured values obtained are shown in Table 1. The measured value is the average of n=5.

[Comparative Example 1]

Comparative Example 1 was carried out using a hydrophilic hot air non-woven fabric (25 g/m ² , a width of 60 mm × a width of 100 mm) containing PP/PE and PET/PE fibers as an inner hydrophilic sheet, and using a PP-containing fiber. Wrinkles were formed in the same manner as in Example 1 except that the water-repellent spunbonded nonwoven fabric (15 g/m ² , width 60 mm × width 120 mm) was used as the outer hydrophilic sheet.

The liquid diffusion areas of the inner hydrophilic sheet and the outer hydrophilic sheet used were measured in the same manner as in the first embodiment. The measured values obtained are shown in Table 1. The measured value is the average of n=5.

[Comparative Example 2]

Comparative Example 2 was carried out using a hydrophilic spunbonded nonwoven fabric (10 g/m ² , a width of 60 mm × a width of 100 mm) containing PP fibers as an inner hydrophilic sheet, and using PP/PE and PET/PE fibers. Pleated wrinkles were formed in the same manner as in Example 1 except that the hydrophilic hot air non-woven fabric (25 g/m ² , vertical width 60 mm × width 120 mm) was used as the outer hydrophilic sheet.

The liquid diffusion areas of the inner hydrophilic sheet and the outer hydrophilic sheet used were measured in the same manner as in the first embodiment. The measured values obtained are shown in Table 1. The measured value is the average of n=5.

[Comparative Example 3]

Comparative Example 3 was carried out using a hydrophilic hot air non-woven fabric (25 g/m ² , a width of 60 mm × a width of 100 mm) containing PP/PE and PET/PE fibers as an inner hydrophilic sheet, and using an acetate-containing fiber. Pleated wrinkles were formed in the same manner as in Example 1 except that the hydrophilic fibrous web (20 g/m ² , vertical width 60 mm × width 120 mm) was used as the outer hydrophilic sheet.

The liquid diffusion areas of the inner hydrophilic sheet and the outer hydrophilic web used were measured in the same manner as in the first embodiment. The measured values obtained are shown in Table 1. The measured value is the average of n=5.

[Comparative Example 4]

Comparative Example 4 was carried out using a hydrophilic hot air non-woven fabric (30 g/m ² , a width of 60 mm × a width of 120 mm) containing PET/PE fibers as an inner hydrophilic sheet, and using hydrophilicity including PET/PE fibers. Wrinkles were formed in the same manner as in Example 1 except that the hot air non-woven fabric (25 g/m ² , vertical width 60 mm × width 70 mm) was used as the outer hydrophilic sheet.

The liquid diffusion areas of the inner hydrophilic sheet and the outer hydrophilic sheet used were measured in the same manner as in the first embodiment. The measured values obtained are shown in Table 1. The measured value is the average of n=5.

[Performance evaluation]

For the wrinkles produced in the examples and the comparative examples, the diffusibility of the liquid was measured by the following method. The results obtained are shown in Table 1.

Using the measuring device (KES-F7 THERMO LABOII) manufactured by Kato Tech Co., Ltd., the side of the inner hydrophilic sheet side of each of the pleats of each of the examples and the comparative examples (corresponding to the skin contact surface side, referred to as "Skin side" and the side of the outer hydrophilic sheet side (corresponding to the non-skin contact side, referred to as "outside" in Table 1). The maximum heat absorption rate qmax before water absorption (hereinafter also referred to as drying) The (kW/m ² ) value was measured. The results obtained are shown in Table 1. The measured value is the average of n=3.

Then, an acrylic plate (width 150 mm × width 150 mm) was placed on the horizontal surface, and wrinkles of the respective examples and comparative examples were placed on the acrylic plate. At this time, it is noted that the inner hydrophilic sheet is disposed on the side of the acrylic sheet. In the center of the wrinkles of each of the examples and the comparative examples, that is, the center of the outer hydrophilic sheet on the side opposite to the surface of the acrylic sheet was placed at a depth of 1.0 kPa, in each of the examples and comparative examples. 0.5 ml of water was injected between the hydrophilic sheet on the inside of the pleats and the acrylic sheet. After the water was poured, the wrinkles of the respective Examples and Comparative Examples were stretched until the wrinkles were stopped and extended, and thereafter, they were again shrunk to the original state. This behavior was performed 5 times in succession. The surface of the inner hydrophilic sheet side (skin side) and the outer side of the hydrophilic sheet side of each of the examples of the pleats of the respective examples and the comparative examples after the expansion and contraction (hereinafter also referred to as "water absorption and contraction") The value of the maximum heat absorption rate qmax (kW/m ² ) of the outer side was measured. The results obtained are shown in Table 1. The measured value is the average of n=3.

In turn, obtains the examples and Comparative Examples of each pleat qmax (kW / m ²⁾ and dried value qmax (kW / m ²⁾ after water absorption of the expansion difference Δqmax values (kW / m ²⁾ value. The results obtained are shown in Table 1.

Here, the qmax value refers to a specific heat stored on a fixed area, a fixed mass of hot plate, and the heat stored in the sample immediately after the hot plate is in contact with the surface of the sample moves to the heat flow on the sample on the low temperature side. The peak value, the larger the qmax value, the greater the body temperature that is captured when wearing clothes, and the contact coldness is increased. In each of the examples and comparative examples in the present specification, the contact cold feeling mostly depends on the amount of water in which the injected water is diffused into each sheet. Therefore, when the qmax value at the time of drying is the same as the sample of the qmax value after the water absorption and contraction, it means that the larger the value of Δqmax (kW/m ² ), the larger the water content.

As is apparent from the results shown in Table 1, in the pleats of Examples 1 to 3, the value of Δqmax (kW/m ² ) on the outer side was larger than the value of Δqmax (kW/m ² ) on the skin side, and was injected into the inner hydrophilic sheet. The water moves to the outer hydrophilic sheet. On the other hand, in the wrinkles of Comparative Examples 1 to 4, contrary to the wrinkles of Examples 1 to 3, the value of Δqmax (kW/m ² ) on the skin side was large, and the water injected into the inner hydrophilic sheet was not easily moved. To the outer hydrophilic sheet, and stay in the inner hydrophilic sheet.

Therefore, in the disposable diaper having the pleats of Examples 1 to 3, the sweat absorbed by the inner hydrophilic sheet easily moves to the outer hydrophilic sheet, and is not easily wetted, so that it is less likely to cause lice on the skin.

Industrial availability

According to the absorbent article of the present invention, since the spread of sweat is high, the generation of eczema, lice, macules, and the like can be reduced.

1A, 1B, 1C, 1D. . . Disposable diaper

2. . . Surface sheet

3. . . Back sheet

4. . . Absorber

5. . . Outer packaging material

6a, 6b. . . Waist flap

7. . . Hydrophilic sheet

8. . . Waist elastic member

9. . . Velcro tape

10. . . Leg cuff

10a. . . Elastic expansion member for forming leg gathers

11. . . Three-dimensional protective forming sheet

11a. . . Elastic member for forming three-dimensional protection

12. . . Side seal

13. . . Waist opening

14. . . Leg opening

15. . . Joint

16. . . Pleated

17. . . groove

40. . . Absorbing ontology

41. . . End of the absorber

51. . . Inner sheet

52. . . Outer sheet

61. . . End of the waist flap

71. . . Inner hydrophilic sheet

72. . . Outer hydrophilic sheet

520. . . Turnback

A. . . Dorsal side

A1, B1. . . Waist area

B. . . Ventral side

C. . . Lower jaw

D. . . region

CL. . . Center line

X, Y. . . direction

Y1, Y2, Y3, Y4. . . line

1 is a developed plan view showing a state in which an unfolded disposable diaper according to a first embodiment of the present invention is unfolded and stretched;

Figure 2 is a sectional view taken along line Y1-Y1 of Figure 1;

Figure 3 is an enlarged plan view showing the outer side hydrophilic sheet used in the diaper shown in Figure 1;

Figure 4 is a perspective view of a pants-type disposable diaper according to a second embodiment of the present invention;

Figure 5 is a developed plan view showing a state in which the pants-type disposable diaper shown in Figure 4 is unfolded and stretched;

Figure 6 is a sectional view taken along line Y2-Y2 of Figure 5;

Figure 7 is an enlarged plan view showing the inner hydrophilic sheet used in the diaper shown in Figure 4;

FIG. 8 is a developed plan view showing a state in which the pants-type disposable diaper according to the third embodiment of the present invention is unfolded and stretched;

Figure 9 is a sectional view taken along line Y3-Y3 of Figure 8;

Figure 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 unfolded and stretched;

Figure 11 is a sectional view taken along line Y4-Y4 of Figure 10;

Figure 12 is a perspective view showing a part of the packaging material in a natural state of the pants-type disposable diaper shown in Figure 10;

Figure 13 is a plan view showing a state in which the outer packaging material of the pants-type disposable diaper shown in Figure 12 is stretched.

1A. . . Disposable diaper

2. . . Surface sheet

3. . . Back sheet

4. . . Absorber

6a, 6b. . . Waist flap

7. . . Hydrophilic sheet

8. . . Waist elastic member

9. . . Velcro tape

10. . . Leg cuff

10a. . . Elastic expansion member for forming leg gathers

11. . . Three-dimensional protective forming sheet

11a. . . Elastic member for forming three-dimensional protection

41. . . End of the absorber

61. . . End of the waist flap

A. . . Dorsal side

A1, B1. . . Waist area

B. . . Ventral side

C. . . Lower jaw

CL. . . Center line

X, Y. . . direction

Y1. . . line

Claims (7)

An unfolded disposable diaper having an absorbent body at a center of a disposable diaper from a back side and a ventral portion, and a hydrophilic sheet disposed at a waist flap; and the hydrophilic sheet The inner hydrophilic sheet having the skin contact surface and the non-skin contact surface side outer hydrophilic sheet disposed on the inner hydrophilic sheet, wherein the sheets are disposed in the waist region, and the waist region includes the back a region between the end of the waist flap and the end of the absorber; the waist flap including the outer hydrophilic sheet and the inner hydrophilic sheet is formed by a waist elastic member The waist elastic member is disposed inside the waist flap in a state of being stretched in the width direction of the disposable diaper; and the outer hydrophilic sheet is diffused compared to the inner hydrophilic sheet The inner hydrophilic sheet forms a liquid-permeable surface sheet; the outer hydrophilic sheet comprises two sheets, and the two sheets are disposed on the left side of the back side, respectively. The waist elastic members are disposed between the two outer hydrophilic sheets, and the outer hydrophilic sheets and the inner hydrophilic sheets are disposed in the longitudinal direction. The end of the waist flap from the back side portion passes over the end side of the absorber body having the absorbent body, and then passes over the absorber The end edge extends to the absorber. The disposable diaper of claim 1, wherein the constituent fibers of the outer hydrophilic sheet are aligned along the width direction of the disposable diaper. The disposable diaper according to claim 1 or 2, wherein the inner hydrophilic sheet is more compressible and deformable than the outer hydrophilic sheet. A disposable diaper according to claim 1 or 2, wherein said outer hydrophilic sheet has a higher density than said inner hydrophilic sheet. The disposable diaper according to claim 1 or 2, wherein the outer hydrophilic sheet has higher evapotranspiration than the inner hydrophilic sheet. The disposable diaper of claim 1 or 2, wherein the disposable diaper is a pant-type disposable diaper; the inner hydrophilic sheet and the outer hydrophilic sheet are attached to a skin contact surface of the folded portion. The disposable diaper is disposed in the width direction of the disposable diaper, and the outer layer of the outer packaging material constituting the disposable diaper is folded back in the waist region; the waist elastic member is disposed on the outer layer sheet and It is disposed between the inner layer sheets on the skin contact surface side of the outer layer sheet. The disposable diaper according to claim 1 or 2, wherein the disposable diaper is a pants-type disposable diaper; the inner hydrophilic sheet constitutes a folded-back portion, and the folded-back portion is an outer packaging material constituting the disposable diaper The outer layer sheet is formed by folding back in the waist region; the outer hydrophilic sheet is formed as an inner layer sheet disposed on the skin contact surface side of the outer layer sheet; The waist elastic member is disposed between the outer layer sheet and the outer hydrophilic sheet.