CN102316838A - Absorbent article - Google Patents

Abstract

A disposable diaper (1A) is equipped with a central absorbent body (4) spanning from a back-side section (A) to an abdomen-side section (B), and with waist flaps (6a, 6b) having a hydrophilic sheet (7) disposed therein. The hydrophilic sheet (7) has an inner hydrophilic sheet (71) and an outer hydrophilic sheet (72) disposed on the side of a surface not in contact with the skin. The outer hydrophilic sheet (72) uses elements having greater liquid diffusion properties that the inner hydrophilic sheet (71). The inner hydrophilic sheet (71) and outer hydrophilic sheet (72) are disposed in a waist region (A1) that includes the region between the edge (61) of the wast flap (6a) on the back-side section (A) and the edge (41) of the absorbent body (4). On the waist flap (6a), gathers that extend in the width direction (X direction) of the diaper (1A) are formed in an elastic waist member (8) disposed within the waist flap (6a).

Description

absorbent article

technical field

This invention relates to the absorbent article provided with the expansion-contraction part, such as a disposable diaper.

Background technique

At present, it is known to improve the distribution of sweat in the waist flaps (usually refers to the part from the absorbent main body including the absorbent core to the outside in the longitudinal direction) to prevent the occurrence of eczema, prickly heat, rash, etc. Disposable diapers. For example, Patent Document 1 discloses a disposable diaper in which an air-permeable sweat-absorbing sheet is bonded to the inner surface of the waistband. In addition, Patent Document 2 discloses a disposable diaper in which a hydrophilic fabric having long fibers arranged in the width direction is provided on the inner surface of the waistband portion.

However, in the disposable diaper described in Patent Document 1, the sweat-absorbing sheet is formed of an upper layer including hydrophilic fibers and a lower layer composed of hydrophobic fibers laminated integrally therewith, and the sweat absorbed by the sweat-absorbing sheet tends to remain inside and absorb sweat. Tablets tend to become wet. In this way, if the sweat-absorbing sheet is in contact with the user's skin for a long time, there is a high possibility of heat rash and the like occurring on the skin.

In addition, in the disposable diaper described in Patent Document 2, the waistband portion has a hydrophobic outer layer sheet, a hydrophobic inner layer sheet, and an elastic member disposed between these layers. It is formed by setting an open-fiber hydrophilic fabric on a permanent inner layer sheet. In this way, the hydrophilic fabric is formed of long fibers, so the distance between the long fibers increases due to the shrinkage of the elastic members during use, and the mobility of sweat in the hydrophilic fabric is reduced, and the shrinkage of the elastic members during use is repeated. , the long fibers are separated, it is difficult to follow the expansion and contraction, and the mobility of sweat in the hydrophilic fabric may be further reduced.

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

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

Contents of the invention

Therefore, the object of the present invention is to improve the diffusibility of sweat and realize an absorbent article that prevents the occurrence of eczema, prickly heat, rash, and the like.

The present invention is a disposable diaper comprising an absorber at the center of the disposable diaper from the back side to the abdomen side, and a hydrophilic sheet provided on the waistband.

The above-mentioned hydrophilic sheet includes: an inner hydrophilic sheet forming a skin-contacting surface; and an outer hydrophilic sheet provided on the non-skin-contacting side of the inner hydrophilic sheet.

The inner hydrophilic sheet and the outer hydrophilic sheet are provided in the waist region including the region between the edge of the waistband portion of the backside portion and the edge of the absorber.

Gathers are formed in the waistband part including the outer hydrophilic sheet and the inner hydrophilic sheet in a state stretched in the width direction of the disposable diaper by a waist elastic member provided inside the waistband part.

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

Description of drawings

Fig. 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.

Fig. 2 is a sectional view of line Y1-Y1 in Fig. 1 .

Fig. 3 is an enlarged plan view of an outer hydrophilic sheet used in the diaper shown in Fig. 1 .

Fig. 4 is a perspective view showing a pull-on disposable diaper according to a second embodiment of the present invention.

Fig. 5 is a developed plan view showing the unfolded and stretched state of the underpants-type disposable diaper shown in Fig. 4 .

FIG. 6 is a cross-sectional view of line Y2-Y2 in FIG. 5 .

Fig. 7 is an enlarged plan view of an inner hydrophilic sheet used in the diaper shown in Fig. 4 .

Fig. 8 is a developed plan view showing an unfolded and stretched state of a pull-on disposable diaper according to a third embodiment of the present invention.

Fig. 9 is a sectional view taken along line Y3-Y3 in Fig. 8 .

Fig. 10 is a developed plan view showing the unfolded and stretched state of the pull-on disposable diaper according to the fourth embodiment of the present invention.

Fig. 11 is a sectional view taken along line Y4-Y4 in Fig. 10 .

Fig. 12 is a perspective view showing a partially cutaway outer covering material in a natural state of the pull-on disposable diaper shown in Fig. 10 .

Fig. 13 is a plan view showing a stretched state of the wrapping material of the pull-on disposable diaper shown in Fig. 12 .

Detailed ways

Hereinafter, the preferred 1st embodiment of the disposable diaper of this invention is demonstrated based on FIGS. 1-3.

Disposable diaper 1A (hereinafter referred to as "diaper 1A") of the first embodiment is formed as shown in FIGS. The width direction of the disposable diaper (hereinafter referred to as "X direction", X direction refers to: the direction perpendicular to the centerline CL extending along the length direction of the diaper 1A) of the entire area of the abdominal side part B on the abdomen side. The absorber 4 is provided in the center, and the hydrophilic sheet 7 is provided on the waist belt parts 6a and 6b. Hydrophilic sheet 7, as shown in Figure 2, has: the inside hydrophilic sheet 71 that forms skin contact surface, the outside hydrophilic sheet that is arranged on the non-skin contact surface side of inside hydrophilic sheet 71. Sexual sheet72. The outer hydrophilic sheet 72 is made of a material with higher liquid diffusibility than the inner hydrophilic sheet 71 . The inner hydrophilic sheet 71 and the outer hydrophilic sheet 72, as shown in FIGS. The area in between is the waist area A1. Gathers are formed on the waistband portion 6a including the outer hydrophilic sheet 72 and the inner hydrophilic sheet 71, and the gathers are provided at the waist inside the waistband portion 6a in a state stretched in the width direction (X direction) of the diaper 1A. The elastic member 8 is formed.

The diaper 1A is formed bilaterally symmetrically with respect to the center line CL, as shown in FIG. 1 . Therefore, in the following description, the right side part shown in FIG. 1 will be mainly described about the left-right symmetrical part.

The diaper 1A will be described in detail. Diaper 1A, as shown in Figure 1, is the disposable diaper of unfolding type, has: the back side part A that is positioned at the wearer's back side when wearing, the belly side part B that is positioned at the wearer's belly side, and is arranged on the back side The crotch part C between the part A and the abdominal part B. The diaper 1A has, as shown in FIG. 1 , a pair of left and right fastening tapes 9, 9 provided in a row on the left and right sides of the back portion A. As shown in FIG. As shown in FIG. 1 , the diaper 1A has a target tape (not shown) on the outside of the abdominal portion B to which the fastening tape 6 is attached.

Moreover, 1 A of diapers have the shape elongate in the same direction as the absorber 4 in the state expanded in the planar shape as shown in FIG.

Diaper 1A, as shown in Figure 1, has: liquid-permeable front sheet 2, liquid-impermeable or water-repellent back sheet 3, the absorption of the liquid retention property that exists between these two sheets 2,3. Body 4. Both sides of the front sheet 2 and the back sheet 3 are in the center of the longitudinal direction (hereinafter referred to as "Y direction", Y direction: a direction parallel to the center line CL), that is, the crotch of the diaper 1. The region corresponding to the portion C is curved to form an hourglass shape contracted in the width direction (X direction). The top sheet 2 and the back sheet 3 constituting the outer surface of the diaper 1A are integrated by joining each other as shown in FIG. 1 . The absorber 4 is also bent in an hourglass shape shrinking in the width direction (X direction) in a region corresponding to the crotch portion C in accordance with the shapes of the front 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 those of conventional unfolded disposable diapers.

In 1 A of disposable diapers of 1st Embodiment, the inside hydrophilic sheet 71 which comprises the hydrophilic sheet 7 forms the surface sheet 2. That is, in the diaper 1A, the surface sheet 2 is the inside hydrophilic sheet 71 as shown in FIGS. 1 and 2 .

In addition, the inner hydrophilic sheet 71 having the hydrophilic sheet 7 and the outer hydrophilic sheet 72 to be described later are sheets in a state where fibers are intertwined, such as non-woven fabrics rather than fabrics in which fibers are not intertwined. state.

In the diaper 1A, the inner hydrophilic sheet 71 and the back sheet 3 extend from both ends 41, 41 in the longitudinal direction (Y direction) of the absorber 4 to the outside in each longitudinal direction (Y direction). The waist belt part 6a of the back side part A and the waist belt part 6b of the abdomen side part B are formed partly.

In the disposable diaper 1A of the first embodiment, the outer hydrophilic sheet 72, as shown in FIGS. The waist region A1 of the region between 41 and the waist region B1 including the region between the end side 61 of the waistband part 6b of the abdominal part B and the end side 41 of the absorber 4 . The outer hydrophilic sheet 72, as shown in FIGS. 71 and the back sheet 3. The outer hydrophilic sheet 72 on the side of the back side part A, in the width direction (X direction), straddles the buckle belts 9, 9 respectively arranged on the left and right sides in the width direction (X direction) of the back side part A. They are provided in between, and extend from the end side 61 of the waistband portion 6a of the back side portion A over the end side 41 of the absorber 4 to the absorber 4 in the longitudinal direction (Y direction). The outer hydrophilic sheet 72 on the abdominal part B side is also the same width and length as the outer hydrophilic sheet 72 on the back side A side.

In the disposable diaper 1A of the first embodiment, the outer hydrophilic sheet 72 is formed of two sheets as shown in FIG. 2 . The two outer hydrophilic sheets 72 have the same shape and the same size, and materials with higher liquid diffusibility than the inner hydrophilic sheet 71 (front sheet 2 ) are used. The liquid diffusivity is measured by the measuring method of the liquid diffusion area described below.

<Measurement method of liquid diffusion area>

On the acrylic resin plate, samples of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 cut into four sides of 100 mm×100 mm were respectively placed, and 0.05 mL of colored water was dripped thereon from 30 mm above. After 10 minutes, the diffusion area of the colored water was measured using an image analyzer. The larger the measured value obtained, the higher the diffusibility of the liquid.

Both of the two outer hydrophilic sheets 72 have structural fibers oriented in the width direction (X direction) of the diaper 1A, as shown in FIG. 3 . The orientation of the fibers is preferably 1 or more, more preferably 1.2 or more, from the viewpoint of diffusivity in the width direction (X direction) and strength in the width direction (X direction). The degree of orientation was measured using Microwavemolecular orientation analyzer MOA-2001A of KANZAKI Company. The outer hydrophilic sheet 72 and the inner hydrophilic sheet 71 cut into a length of 100 mm×width of 50 mm were respectively used as samples, and the average value of three points in each sample was measured as the degree of orientation.

Moreover, the inner side hydrophilic sheet 71 (top sheet 2) in diaper 1A is oriented to the longitudinal direction (Y direction) (not shown).

The waist elastic member 8 is provided inside the waistband part 6a of the back part A and the waistband part 6b of the abdominal part B in a state stretched in the width direction (X direction) as shown in FIGS. 1 and 2 . In the disposable diaper 1A of the first embodiment, 1 to 10 thread-shaped multiple waist elastic members 8 are arranged between two outer hydrophilic sheets 72 and 72 as shown in FIGS. 1 and 2 . They are intermittently arranged side by side in the longitudinal direction (Y direction). Gathers are formed on each of the waist belt portion 6 a of the back side A and the waist belt portion 6 b of the abdomen side B including the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 by the waist elastic member 8 provided in this way.

In consideration of seamless contact with the wearer's body, fluctuations and stretches of the abdominal circumference due to changes in posture, breathing, etc., the stretch ratio of the waist elastic member 8 is preferably 150% to 300%, more preferably 200% to 250%. The stretching magnification referred to here is a value obtained by the following formula with A (mm) as the length when not stretched and B (mm) as the length when stretched.

Stretch ratio (%) = (B/A) × 100

From the left and right sides in the longitudinal direction (Y direction) of the absorber 4, the front sheet 2 (inside hydrophilic sheet 71) and the back sheet 3 are respectively shown in FIG. Extended outside, the extended front sheet 2 and the extended back sheet 3 are joined to form a pair of leg straps 10 , 10 . Set 1 ~ 5 elastic elastic members 10a for the formation of the leg folds in the leg bands 10, 10, the elastic elastic members 10a for the formation of the leg folds are composed of the front sheet 2 (inside hydrophilic sheet 71) and the back surface. The sheet 3 is pinched and fixed. Thereby, leg gathers are formed in the crotch part C of the diaper 1 by contraction of the elastic elastic member 10a.

The sheets 11 and 11 for three-dimensional gathers formation are each provided so that the side part of the surface sheet 2 may be covered in the left and right both sides of the longitudinal direction (Y direction) of diaper 1A. Each three-dimensional protection is formed with the sheet 11, in the region of the prescribed width of both ends of the longitudinal direction (Y direction) and the outer side of the width direction (X direction), is fixed on the front sheet 2 and the width direction ( The inner side of the X direction) is a free state. The sheet material 11 that three-dimensional protection is used for forming has the elastic member 11a that three-dimensional protection is used for forming, and when wearing, pass this elastic member The free state part on the inner side of the width direction (X direction) of the sheet material 11 for forming three-dimensional gathers stands up, and three-dimensional gathers are formed on the side of the wearer's skin contact surface in the diaper 1A.

The forming material of the disposable diaper 1A of 1st Embodiment is demonstrated.

As the hydrophilic sheet 7, specifically, as the surface sheet 2 (inner hydrophilic sheet 71) and the outer hydrophilic sheet 72, sheets that are hydrophilic and capable of absorbing and retaining water are used. Here, the "sheet material" refers to a state in which fibers are entangled, such as a nonwoven fabric, excluding a fabric state in which fibers are not entangled. In addition, "hydrophilicity" refers to both the absorption and retention of water by the fiber itself and the absorption and retention of water through the space between fibers. Examples thereof include a sheet of hydrophilic fibers, a sheet obtained by hydrophilizing hydrophobic fibers with an oil agent, and the like. Specifically, it is suitable to use non-woven fabrics (such as spunlace non-woven fabrics) containing hydrophilic fibers such as cotton, rayon, pulp, etc., and hydrophobic fibers such as polyethylene fibers or polypropylene fibers formed by oil agents. A material obtained by implementing a hydrophilic treatment on a non-woven fabric. For each of the front sheet 2 (inner hydrophilic sheet 71) and the outer hydrophilic sheet 72, either a sheet made of hydrophilic fibers or a sheet obtained by hydrophilizing the hydrophobized fibers can be used. It is not limited to this combination, but considering that in the case of wearing and using for a long time in a state of sweating a lot, the dry feeling on the skin side needs to be maintained for a longer time due to the low liquid retention of the sheet itself, and the front sheet 2 (Inside hydrophilic sheet 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 and the like. For example, when a hydrophilic fiber sheet is used as the hydrophilic sheet 7, the paper weight of the front sheet 2 (inside hydrophilic sheet 71) is preferably 10 to 100 g/m ² , more preferably 20 to 100 g/m 2 . 60g/m ² . When a hydrophilic sheet is used, the paper weight of the outer hydrophilic sheet 72 is preferably 10 to 80 g/m ² , more preferably 10 to 60 g/m ² .

From the point of view of improving flexibility, the contraction of the waist elastic member 8 makes it easier to form finer wrinkles, and reducing the uncomfortable feeling of the wearer when it comes into contact with the skin, the sweat accumulated in the gap between the fibers is stretched and stretched through the wrinkles. From the viewpoint of easy movement to the outer hydrophilic sheet 72 , it is preferable to use a material that is easier to compress and deform than the outer hydrophilic sheet 72 for the inner hydrophilic sheet 71 . The term "easy to compress and deform" refers to a sheet that is easily deformed by compression in the thickness direction.

From the viewpoint of quickly moving sweat from the skin-contacting side to the non-skin-contacting side by capillary force, the outer hydrophilic sheet 72 is preferably made of a material with a higher density than the inner hydrophilic sheet 71. 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 , more preferably 0.1 to 0.2 g/cm ³ . When using a hydrophilic fiber sheet, the paper weight of the surface sheet 2 (inside hydrophilic sheet 71) is preferably 0.01 to 0.2 g/cm ³ , more preferably 0.02 to 0.1 g/cm ³ .

From the point of view that the sweat that moves from the side of the skin contact surface does not flow back and emits body fluids through the outer hydrophilic sheet 72, the outer hydrophilic sheet 72 is preferably made of a material with higher distributability than the inner hydrophilic sheet 71. Material. The liquid emission is measured by the measuring method of liquid emission described below.

<Measurement method of liquid emission>

On the acrylic resin plate, spray 0.2 g of distilled water. Each sample of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 cut into four sides of 100 mm × 100 mm is placed on the sprayed distilled water, and in a constant temperature environment with a temperature of 20° C. and a humidity of 65% RH, The weight change measures the amount of distilled water emitted. The amount of distilled water emitted after 10 minutes (the weight of the sample including distilled water after 10 minutes - the original weight of the sample) is divided by the initial distilled water (0.2g), and the ratio is the value of the liquid emission. The measured value is the average value of n=3.

As the backsheet 3, the absorber 4, and the three-dimensional guard forming sheet 11 for forming a pair of three-dimensional guards, any material is not particularly limited as long as it is generally used in 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 , fiber aggregates of fibrous materials such as pulp, or those in which a superabsorbent polymer is supported and wrapped with a covering material such as tissue paper or water-permeable nonwoven fabric can be used. As the sheet 11 for three-dimensional guard formation, a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet of these can be used.

The waist elastic member 8, the elastic member 10a for forming leg gathers, and the elastic member 11a for forming three-dimensional guards are not particularly limited as long as they are generally used in absorbent articles such as disposable diapers. For example, natural rubber, polyurethane resin, polystyrene-polyisoprene copolymer, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, ethyl acrylate- Stretchable materials such as polyethylene-α-olefin copolymers such as ethylene, etc.

As the fastening material forming the fastening tape 9, there is no particular limitation as long as it is generally used in absorbent articles such as disposable diapers. For example, "Magic Tape (registered trademark)" (manufactured by Kuraray Co.), "Quicklon (registered trademark)" (manufactured by YKK Company), "Magicloth (registered trademark)" (manufactured by Kanebo Bell-Touch Co., Ltd.) can be used as the fastener material. ) etc. in convex parts, etc. As the target tape, it is made of an endless material having a surface structure capable of being combined with the bonding protrusions of the hook and loop material. As such an endless material, a material that can stick and stop the hook and loop material by pressing the hook and loop material can be used, and there is no special limitation. . For example, female members among the above-mentioned various known mechanical surface fasteners can be used. In addition, the outer surface of the abdominal part B (the non-skin-contacting surface of the back sheet 3 ) can be directly bonded to the fastening material bonding protrusions, for example, can be made of a non-woven fabric with good bondability.

Next, the effect of using the diaper 1A of the first embodiment of the present invention described above will be described.

Diaper 1A, as shown in Figures 1 and 2, is equipped with a hydrophilic sheet 7 (inside hydrophilic sheet 7 forming the skin contact surface) at the skin contact surfaces of the waistband portions 6a, 6b that are prone to eczema, prickly heat, rash, etc. Sheet 71 and the outer hydrophilic sheet 72 disposed on the non-skin-contacting side of the inner hydrophilic sheet 71), so the wearer's sweat can move to the inner hydrophilic sheet 71. The diaper 1A, as shown in FIG. 1, has folds formed by the waist elastic member 8 at the waistband portion 6a, and is always expanded and contracted by the wearer's breathing and walking movements, and the sweat that moves to the inner side of the hydrophilic sheet 71 is easily Move to the outer hydrophilic sheet 72 . Since the outer hydrophilic sheet 72 of the diaper 1A has higher liquid diffusivity than the inner hydrophilic sheet 71 , sweat that has moved to the outer hydrophilic sheet 72 can be rapidly diffused. In this way, the inner hydrophilic sheet 71 that forms the skin-contacting surface of the waistband portion 6 is less likely to retain sweat and become wet, thereby preventing the occurrence of eczema, prickly heat, rash, and the like. In addition, since the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 of the diaper 1A are both sheets, the distance between the fiber components is difficult to change due to the expansion and contraction of the wrinkles caused by the wearer's breathing or walking movement. Mobility of sweat from the inner hydrophilic sheet 71 to the outer hydrophilic sheet 72 is less likely to decrease, and the effect of preventing occurrence of eczema, prickly heat, and rash can be maintained.

In addition, in the diaper 1A, as shown in FIG. 3 , the fiber configurations of the two outer hydrophilic sheets 72 are all oriented in the width direction (X direction) of the diaper 1A, so the liquid diffusivity is higher, and the outer hydrophilic sheet 72 is moved to the outer side. Sweat from the sheet 72 is able to spread more quickly. In this way, the inner hydrophilic sheet 71 that forms the skin-contacting surface of the waistband portion 6 is less likely to retain sweat and become wet, thereby preventing the occurrence of eczema, prickly heat, rash, and the like.

Next, a disposable diaper according to a second embodiment of the present invention will be described based on FIGS. 4 to 6 .

Disposable diaper 1B of 2nd Embodiment is demonstrated about the point which differs from 1 A of disposable diapers of 1st Embodiment. The point which does not demonstrate in particular is the same as that of the disposable diaper 1A of 1st Embodiment, and the description about the disposable diaper 1A of 1st Embodiment is applied.

The disposable diaper 1B (henceforth "diaper 1B") of 2nd Embodiment is an underpants type disposable diaper as shown in FIG.4, FIG.5. The inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 of the diaper 1B are formed by folding the outer layer sheet 52 of the outer covering material 5 of the diaper 1B at the waist region A1 of the back side A. The skin contact surface is provided in the width direction (X direction) of the diaper 1B. The waist elastic members 8 of the diaper 1B are provided between the outer layer sheet 52 and the inner layer sheet 51 provided on the skin-contacting 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 characterized in that they are compatible with the sheet constituting the outer covering material 5 and the sheet constituting the absorbent main body 40 described later. for different sheets.

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 front sheet 2 , a back sheet 3 , and an absorbent body 4 interposed between the two sheets 2 and 3 ; The entire area of the outer side extends and is located on the side of the non-skin-contacting surface of the absorbent main body 40, and is joined and fixed to the outer wrapping material 5 of the absorbent main body 40. The side edges are joined to each other by known joining methods such as heat sealing, high-frequency sealing, ultrasonic sealing, 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 part 14,14 are formed in the diaper 1B. Furthermore, between the back side part A and the belly side part B is the crotch part C.

As shown in FIG. 5, the absorbent main body 40 is in a vertically long rectangular shape, and the longitudinal direction (Y direction) coincides with the longitudinal direction (Y direction) of the diaper 1, so as to extend from the back side A of the diaper 1 to the abdomen side B. In this way, it is joined to the central portion of the outer covering material 5 in the width direction (X direction). As shown in FIG. 5 , sheets 11 and 11 for forming three-dimensional protection are respectively provided on the left and right sides of the absorbent body 40, and the inner sides of the sheets 11 for forming three-dimensional protection in the width direction (X direction) On the upper portion, the elastic member 11a for forming the three-dimensional guard is provided in a stretched state, and when worn, three-dimensional gathers are formed on the left and right sides of the absorbent main body 40 by the contraction force of the elastic member 11a.

The outer cover material 5 is composed of two sheets as shown in FIG. The outermost part of 1B. The inner layer sheet 51 is adjacent to the outer layer sheet 52 and is provided on the inner side of the diaper 1B. As shown in FIG. 5 , the inner-layer sheet 51 and the outer-layer sheet 52 have the same contours of the side edges, but have different shapes in the longitudinal direction (Y direction). Specifically, as shown in FIG. 6 , the outer layer sheet 52 has extensions extending in respective front and rear directions from the front and rear end edges in the longitudinal direction (Y direction) of the inner sheet 51 . After the extended parts of the outer layer sheet 52 are provided on the inner layer sheet 51 of the outer covering material 5 to fix the absorbent main body 40, they are folded back on the side of the absorbent main body 40 so as to cover the front and rear ends of the absorbent main body 40, forming a folded back. part 520 (see FIG. 6). As shown in FIG. 5 , the free end of the folded portion 520 extends to the leg opening, that is, extends to the position covering the entire area of the side seal portion 12 , and reaches the absorber 4 . In this way, the diaper 1B extends from the front and rear end sides 41 and 41 of the absorber 4 in respective front and rear directions to form the waist belt parts 6a and 6b (see FIG. 6 ).

In the disposable diaper 1B of the second embodiment, as shown in FIGS. 5 and 6 , the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 constituting the hydrophilic sheet 7 are sheets of the same shape and size. , provided in the width direction (X direction) on the skin contact surface of the folded portion 520 on the side of the dorsal portion A. The inner hydrophilic sheet 71 of the diaper 1B is provided on the skin-contacting surface of the outer hydrophilic sheet 72 . In the diaper 1B, as shown in FIGS. 5 and 6 , the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are provided on the end edge 61 of the waistband portion 6 a including the back side A and the end edge 41 of the absorber 4 . The area in between is the waist area A1. As shown in Figures 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 wider than the width between the side seal parts 12 and 12. The intervals are extended in a narrow manner.

As shown in Figures 5 and 6, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72, in the longitudinal direction (Y direction), extend from the end edge 61 of the waistband portion 6a of the back side part A to no more than the folded back. The area of the free end edge of the portion 520. In this way, each of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 overlaps at the folded portion 520, and does not exceed the free edge of the folded portion 520, thus, the inner hydrophilic sheet 71 and the outer hydrophilic sheet The sheets 72 are not in contact with the surface sheet 2, and excreted urine and feces can be prevented from contaminating the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72.

The disposable diaper 1B of the second embodiment, for example, is used for babies, as shown in FIGS. , extending from the edge 61 of the waistband portion 6 a of the back side A over the edge of the absorbent main body 40 , further over the edge 41 of the absorber 4 , and extending onto the absorber 4 . In addition, when the disposable diaper 1B of the second embodiment is used by an adult, for example, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are separated from the back side A in the longitudinal direction (Y direction). The edge 61 of the waistband part 6a extends to the vicinity of the edge of the absorptive main body 40 . In this way, when the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 do not overlap with the absorbent main body 40, urine or the like absorbed by the absorbent main body 40 can be prevented from seeping into the inner hydrophilic sheet. 71 and the outer hydrophilic sheet 72. Therefore, it is more effective at bedtime when the wearer's own weight increases due to the state in which urine is absorbed up to the end of the absorptive main body 40 .

Both the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 of the disposable diaper 1B of the second embodiment are oriented in the width direction (X direction) of the diaper 1A as shown in FIGS. 3 and 7 . From the viewpoint of quickly moving sweat from the skin contact surface side to the non-skin contact surface side by capillary force, the outer hydrophilic sheet 72 preferably uses a material with a higher density than the inner hydrophilic sheet 71 ( Refer to Figure 3, Figure 7).

In the disposable diaper 1B of the second embodiment, as shown in FIG. 6 , the waist elastic member 8 is provided on the waist belt portion 6 a of the back side portion A and the waist belt portion of the abdomen side portion B in a state stretched in the width direction (X direction). inside of part 6b. In the disposable diaper 1B of the second embodiment, as shown in FIGS. 5 and 6 , a plurality of 1 to 30 string-shaped waist elastic members 8 are provided on the inner layer sheet 51 and the outer layer sheet constituting the outer covering material 5 . The materials 52 are intermittently arranged side by side in the longitudinal direction (Y direction). Gathers are formed on the waist belt portion 6a of the back side A and the waist belt portion 6b of the abdomen side B including the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 by the waist elastic members 8 provided in this way.

The forming material of the disposable diaper 1B of 2nd Embodiment is demonstrated.

The difference between the disposable pull-on diaper 1B of the second embodiment and the disposable pull-on diaper 1A of the first embodiment will be described. Points not particularly described are the same as those of the pull-on disposable diaper 1A of the first embodiment.

As the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 , sheet materials that are hydrophilic and capable of absorbing and retaining water are used. An example thereof includes a sheet of hydrophilic fibers. As the hydrophilic sheet 7 of the diaper 1B, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 can be joined to each other using a known joining method such as an adhesive, heat sealing, high-frequency sealing, ultrasonic sealing, etc. integrated sheet.

As the outer layer sheet 51 and the inner layer sheet 52 constituting the outer cover material 5, generally, any material used for absorbent articles such as disposable diapers can be used, and there is no particular limitation. For example, a waterproof nonwoven fabric or the like can be used as the outer layer sheet 51 and the inner layer sheet 52 .

When using the disposable diaper 1B of 2nd Embodiment of this invention mentioned above, the same effect as the disposable diaper 1A of 1st Embodiment is acquired.

Next, the disposable diaper of the 3rd embodiment of this invention is demonstrated based on FIGS. 8-9.

The disposable diaper 1B of 3rd Embodiment is demonstrated, and it demonstrates about the point which differs from the disposable diaper 1A of 1st Embodiment or the disposable diaper 1C of 2nd Embodiment. Points not particularly described are 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 applied. .

Disposable diaper 1C (henceforth "diaper 1C") of 3rd Embodiment is an underpants type disposable diaper like diaper 1B (refer FIG. 4, FIG. 8). As shown in FIG. 9 , the inner hydrophilic sheet 71 is configured by folding the outer layer sheet 52 constituting the outer cover material 5 of the diaper 1C in the waist region A1 constituting the back side A and the waist region B1 of the abdominal part B respectively. And the turning part 520 is formed. As shown in FIG. 9 , the outer hydrophilic sheet 72 forms the inner layer sheet 51 provided on the skin-contacting side of the outer layer sheet 52 . The waist elastic member 8 is provided 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 the folded portion 520 of the outer layer sheet 52 constituting the outer cover material 5 , The outer hydrophilic sheet 72 is the inner layer sheet 51 constituting the outer cover material 5 .

The diaper 1C is demonstrated in detail. As shown in FIGS. 8 and 9 , the diaper 1C is provided with an outer covering material 5 extending over the entire outer region of the absorptive main body 40 . The outer cover material 5 is composed of a laminated body of an outer layer sheet 52 and an inner layer sheet 51 as shown in FIGS. 8 and 9 . The outer layer sheet 52 constitutes the outermost surface of the diaper 1B. The inner layer sheet 51 is adjacent to the outer layer sheet 52 and is provided on the inner side of the diaper 1B. 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 ) and the outer-layer sheet 52 have the same contours of the sides, but have different shapes in the longitudinal direction (Y direction). Specifically, as shown in FIG. 9 , the outer layer sheet 52 has extensions extending in the front and rear directions from the front and rear ends of the inner layer sheet 51 (outer hydrophilic sheet 72 ) in the longitudinal direction (Y direction). After the extension parts of the outer layer sheet 52 are respectively provided on the inner layer sheet 51 (outer hydrophilic sheet 72) of the outer covering material 5 to fix the absorbent main body 40, the front and rear ends of the absorbent main body 40 are covered. One side of the main body 40 is folded back to form a folded portion 520 (see FIG. 6 ). In 1C of disposable diapers of 3rd Embodiment, this folded-back part 520 is the inside hydrophilic sheet|seat 71. As shown in FIG. The free end edge of the folded portion 520 (inside hydrophilic sheet 71) passes over the edge of the absorbent main body 40 from the end edge 61 of the waistband portion 6a of the back side portion A and the end edge 61 of the waistband portion 6b of the abdomen portion B, respectively. The front and rear ends respectively go over the front and rear ends 41 of the absorber 4 and extend to the absorber 4 respectively (see FIG. 8 and FIG. 9 ).

In the disposable diaper 1C of the third embodiment, as shown in FIG. 8 , the waist elastic member 8 is provided on the waist belt portion 6 a of the back side portion A and the waist belt portion of the abdomen side portion B in a state extending in the width direction (X direction). The inside of each part 6b. In the disposable diaper 1C of the third embodiment, 1 to 30 string-shaped waist elastic members 8, as shown in FIGS. Between the water-based sheet 72) and the outer layer sheet 52, it is juxtaposed intermittently in the longitudinal direction (Y direction). With the waist elastic member 8 thus provided, 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) are formed on the back side A. The waistband portion 6a of the A and the waistband portion 6b of the abdominal portion B form gathers.

The forming material of the disposable diaper 1C of the third embodiment is the same as that of the disposable pull-on diaper 1A of the first embodiment or the disposable pull-on 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 effect at the time of using the disposable diaper 1C of 3rd embodiment of this invention mentioned above is demonstrated.

1 C of disposable diapers of 3rd Embodiment acquire the same effect as 1 A of disposable diapers of 1st Embodiment, or the disposable diaper 1B of 2nd Embodiment. Hereinafter, the effect which differs between the unfolded disposable diaper 1A of 1st Embodiment and the disposable diaper 1B of 2nd Embodiment is demonstrated.

The disposable diaper 1C of the third embodiment has a relatively small number of components compared with the diaper 1A and the diaper 1B, so the gathers are formed on the waistband 6a of the backside A and the waistband 6b of the abdomen B, respectively. It is thinner and improves the skin contact feeling.

The disposable diaper 1C of the third embodiment has a relatively small number of components compared with the diaper 1A and the diaper 1B, so the heat retention of the waistband 6a of the back side A and the waistband 6b of the abdomen B is low, The wearer does not sweat easily.

Next, the disposable diaper of 4th Embodiment of this invention is demonstrated based on FIGS. 10-13.

About the disposable diaper 1D of 4th Embodiment, the point which differs 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. Points not particularly described are similar to 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 and the disposable diaper of the second embodiment are applied. Description of the disposable diaper 1B of the second embodiment or the disposable diaper 1C of the third embodiment.

Disposable diaper 1D (hereinafter, referred to as "1D") of the fourth embodiment is an underpants type disposable diaper like diaper 1B and diaper 1C (see FIG. 4 and FIG. 10 ). As shown in Figure 11, the inner hydrophilic sheet 71 is the inner layer sheet 51 provided on the side of the skin-contacting surface that constitutes the outer covering material 5 of the diaper 1D, and the outer hydrophilic sheet 72 is the inner layer sheet 51 that constitutes the diaper 1D. The outermost outer layer sheet 52 which comprises the outermost cover material 5 of diaper 1D. As shown in FIG. 11 , the waist elastic member 8 is provided between an inner hydrophilic sheet 71 (inner layer sheet 51 ) and an outer hydrophilic sheet 72 (outer layer sheet 52 ).

The disposable diaper 1D of the fourth embodiment is different from the disposable diaper 1B of the second embodiment and the disposable diaper 1C of the third embodiment in that the inner hydrophilic sheet 71 is the inner surface of the outer covering material 5 . The layer sheet 51 and the outer hydrophilic sheet 72 are the outer layer sheet 52 constituting the outer covering material 5 .

In the disposable diaper 1D of the fourth embodiment, as shown in FIGS. 10 and 11 , the inner hydrophilic sheet 71 (inner sheet 51) and the outer hydrophilic sheet 72 (outer sheet 52) are The profile of the side part is the same shape, and the shape in the longitudinal direction (Y direction) is also the same shape. In the diaper 1D, as shown in Fig. 12 and Fig. 13, the inside hydrophilic sheet 71 (inner layer sheet 51) and the outside hydrophilic sheet 72 (outer layer sheet 52) are arranged in the width direction (X direction). ) and the longitudinal direction (Y direction) are intermittently joined to each other via the joining portion 15 .

In the disposable diaper 1D of the fourth embodiment, as shown in FIGS. 10 and 11, the waist elastic members 8 are respectively provided on the waistband portion 6a and the abdominal side of the back portion A in a state stretched in the width direction (X direction). The inside of the belt part 6b of part B. In the diaper 1D, 2 to 30 string-shaped plurality of waist elastic members 8, as shown in FIGS. The layer sheets 52 (outer hydrophilic sheets 72 ) are provided so as not to pass through the joint portion 15 , and are intermittently arranged in parallel in the longitudinal direction (Y direction). In addition, each waist elastic member 8 of the fourth embodiment, as shown in FIGS. ) and the outer layer sheet 52 (the outer hydrophilic sheet 72) are joined, and the positions other than the two side seals 12, 12 are relatively opposite to the inner layer sheet 51 (the inner hydrophilic sheet 71) and the outer layer sheet 52 (outer hydrophilic sheet 72) is not joined. With the waist elastic member 8 thus provided, the waist belt portion 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) are respectively Each of the belt parts 6b of the abdominal part B is gathered.

In the disposable diaper 1D of the fourth embodiment, as shown in FIG. The joining portions 15 are provided so as to form rows in the width direction (X direction) and the longitudinal direction (Y direction). In the diaper 1D of the fourth embodiment, the joining portions 15 constituting a row in the width direction (X direction) and the elastic members 8 stretched in the width direction (X direction) are alternately provided in the longitudinal direction (Y direction).

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

In the disposable diaper 1D of the fourth embodiment, as shown in FIG. 12 , each of the wrinkles of the inner hydrophilic sheet 71 (inner layer sheet 51) and the outer hydrophilic sheet 72 (outer layer sheet 52) The (ridge) 16 is formed so as to protrude outward, and a convex curved surface having an arc-shaped cross section is formed at the front end of each pleat (ridge) 16 in the protruding direction. This convex curved surface extends continuously in the longitudinal direction (Y direction) as shown in FIG. 12 . In the disposable diaper 1D according to the fourth embodiment, as shown in FIG. 12 , creases (ridges) are formed between joining portions 15 adjacent in the width direction (X direction) and constituting a row in the longitudinal direction (Y direction). 16. These pleats (ridges) 16 extend continuously in the longitudinal direction (Y direction) without being interrupted at positions overlapping with the absorber 4 . That is, as shown in FIG. 12 , in a natural state (a state where no external force is applied), the waist elastic member 8 contracts, and the joining portions 15 constituting a row in the longitudinal direction (Y direction) form a groove 17, and the groove 17 is connected to the gathers (ridges). ) 16 are alternately formed in the width direction (X direction).

The forming material of the disposable diaper 1D of the fourth embodiment is the same as that of the disposable pull-on diaper 1A of the first embodiment, the disposable pull-on diaper 1B of the second embodiment, or the disposable pull-on diaper 1C of the third embodiment. . That is, the inner hydrophilic sheet 71 is the same as the inner layer sheet 51 constituting the exterior material 5 , and the outer hydrophilic sheet 72 is the same as the outer layer sheet 52 constituting the exterior material 5 . In addition, the bonding portion 15 may be formed by thermal fusion bonding, or may be formed by bonding with a hot-melt adhesive or the like.

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 4th Embodiment acquires the same effect as the disposable diaper 1A of 1st Embodiment, the disposable diaper 1B of 2nd Embodiment, or the disposable diaper 1C of 3rd 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.

The disposable diaper 1D of the fourth embodiment, as shown in FIG. The waistband portion 6b and the abdominal portion B have folds formed by alternately forming folds (ridges) 16 and grooves 17 in the width direction (X direction), and the outer covering material 5 is soft to the touch and has a beautiful appearance.

In the disposable diaper 1D of the fourth embodiment, as shown in FIG. The outer layer sheet 52 (outer hydrophilic sheet 72) is not joined, but in the joining portion 15 constituting the row in the longitudinal direction (Y direction), the grooves 17 are formed, and in the longitudinal direction (Y direction) of each groove 17, In the region D between the adjacent junctions 15 , the inner hydrophilic sheet 71 (inner layer sheet 51 ) and the outer hydrophilic sheet 72 (outer layer sheet 52 ) are in contact. Therefore, in the disposable diaper 1D of the fourth embodiment, in the area D between the joining portions 15 adjacent to the longitudinal direction (Y direction) of each groove 17, the inner hydrophilic sheet 71 (inner layer sheet) 51), the sweat can be effectively moved to the outer hydrophilic sheet 72 (outer layer sheet 52), and the sweat can be effectively distributed.

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. can be changed appropriately.

For example, in the above-mentioned 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, the hydrophilic sheet 7 2, 6, 9, and 11, the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 are arranged adjacent to each other, but the inner hydrophilic sheet 71 and the outer hydrophilic Another water-permeable sheet may be interposed between the permeable sheets 72 .

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

In addition, in the disposable diaper 1A of the above-mentioned first embodiment, the outer hydrophilic sheet 72 is composed of two sheets as shown in FIG. Sheet 71 (front sheet 2) is a material with higher liquid diffusivity, but only the outer hydrophilic sheet 72 of either side has higher liquid diffusibility than the inner hydrophilic sheet 71 (front sheet 2). Can, if 2 sheets all use under the situation of the material that the liquid diffusibility is higher than inner side hydrophilic sheet 71 (face sheet 2), in 2 sheets, the outer side of non-skin contact surface side is hydrophilic. The water-based sheet 72 may also use a material with higher liquid diffusivity than the outer hydrophilic sheet 72 on the skin-contacting side.

In addition, in the disposable diaper 1A of the above-mentioned first embodiment, both of the two outer hydrophilic sheets 72 are oriented in the width direction (X direction) of the diaper 1A as shown in FIG. Orientation in the width direction (X direction) may be performed only in the width direction (X direction) of any one of the outer hydrophilic sheets 72 .

In addition, 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 shape as shown in FIGS. 5 and 6 . Size, but not the same size piece of the same shape is also available.

Example

Hereafter, although an Example demonstrates this invention more concretely, this invention is not limited to these.

[Example 1]

Example 1, a hydrophilic air-through non-woven fabric (25g/m ² , 60mm in width x 100mm in width) composed of PP/PE and PET/PE fibers was used as the inner hydrophilic sheet, Two hydrophilic spunbonded nonwoven fabrics (10 g/m ² , 60 mm in length x 120 mm in width) made of PP fibers were used as the outer hydrophilic sheet. In addition, 10 strands of natural rubber (470dtex) were used as waist elastic members. In Example 1, the inner hydrophilic sheet was placed on a flat surface, one of the outer hydrophilic sheets was placed on the inner hydrophilic sheet, and one of the outer hydrophilic sheets was placed side by side at intervals of 5 mm and stretched. For 10 waist elastic members with a stretch ratio of 200%, these waist elastic members are sandwiched, another outer hydrophilic sheet is provided, and one outer hydrophilic sheet and The other outer hydrophilic sheet is bonded all over, thereby forming the pleats.

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

[Example 2]

Example 2, a weakly hydrophilic spun-bonded nonwoven fabric (19 g/m ² , 60 mm in length x 100 mm in width) composed of PP fibers was used as the inner hydrophilic sheet, and PP was used as the outer hydrophilic sheet. Pleats were produced in the same manner as in Example 1 except that hydrophilic SMMS (spunbond/meltblown/meltblown/spunbond) (10 g/m ² , 60 mm in length x 120 mm in width) composed of fibers was used.

The liquid diffusion area of each of the inner hydrophilic sheet and the outer hydrophilic sheet used was measured in the same manner as in Example 1. The measured values obtained are shown in Table 1. The measured value is the average value of n=5.

[Example 3]

Embodiment 3, use the hydrophilic air-through non-woven fabric (36g/m ² , longitudinal 60 mm wide x 100 mm wide), and a hydrophilic spun-bonded nonwoven fabric (10 g/m ² , 60 mm wide x 120 mm wide) made of PP fibers was used as the outer hydrophilic sheet. In the same manner as in Example 1, folds were produced.

The liquid diffusion area of each of the inner hydrophilic sheet and the outer hydrophilic sheet used was measured in the same manner as in Example 1. The measured values obtained are shown in Table 1. The measured value is the average value of n=5.

[Comparative example 1]

Comparative Example 1, as the inner hydrophilic sheet, a hydrophilic air-through non-woven fabric (25g/m ² , 60mm in width x 100mm in width) composed of PP/PE and PET/PE fibers was used as the hydrophilic sheet on the outside. Pleats were produced in the same manner as in Example 1 except that a waterproof spunbond nonwoven fabric (15 g/m ² , 60 mm in length x 120 mm in width) composed of PP fibers was used as the sheet.

The liquid diffusion area of each of the inner hydrophilic sheet and the outer hydrophilic sheet used was measured in the same manner as in Example 1. The measured values obtained are shown in Table 1. The measured value is the average value of n=5.

[Comparative example 2]

Comparative Example 2, as the inner hydrophilic sheet, a hydrophilic air-through non-woven fabric (10g/m ² , 60 mm in length and 100 mm in width) made of PP fiber was used as the inner hydrophilic sheet, and PP/ Pleats were produced in the same manner as in Example 1 except that a hydrophilic air-through nonwoven fabric (25 g/m ² , 60 mm in length x 120 mm in width) composed of PE and PET/PE fibers was used.

The liquid diffusion area of each of the inner hydrophilic sheet and the outer hydrophilic sheet used was measured in the same manner as in Example 1. The measured values obtained are shown in Table 1. The measured value is the average value of n=5.

[Comparative example 3]

Comparative Example 3, as the inner hydrophilic sheet, a hydrophilic air-through non-woven fabric (25g/m ² , 60 mm in length and 100 mm in width) composed of PP/PE and PET/PE fibers was used as the outer hydrophilic sheet. Pleats were formed in the same manner as in Example 1 except that a hydrophilic fabric (20 g/m ² , 60 mm in length x 120 mm in width) made of acetate fiber was used as the sheet.

The liquid diffusion area of each of the inner hydrophilic sheet and the outer hydrophilic sheet used was measured in the same manner as in Example 1. The measured values obtained are shown in Table 1. The measured value is the average value of n=5.

[Comparative example 4]

Comparative Example 4, a hydrophilic air-through non-woven fabric (30 g/m ² , 60 mm in length and 120 mm in width) composed of PET/PP fibers was used as the inner hydrophilic sheet, and PET was used as the outer hydrophilic sheet. Pleats were produced in the same manner as in Example 1 except that a hydrophilic air-through nonwoven fabric (25 g/m ² , 60 mm in width x 70 mm in width) made of /PP fibers was used.

The liquid diffusion area of each of the inner hydrophilic sheet and the outer hydrophilic sheet used was measured in the same manner as in Example 1. The measured values obtained are shown in Table 1. The measured value is the average value of n=5.

[Performance Evaluation]

For the pleats produced in Examples and Comparative Examples, the liquid diffusivity was measured by the following method. The obtained results are shown in Table 1.

Using a measuring device (KES-F7 THERMOLABOII) produced by KATO TECH, measure the surface of the inner side of the hydrophilic sheet (corresponding to the side of the skin contact surface, which is abbreviated in Table 1) for each of the wrinkles of each embodiment and each comparative example. Denoted as "skin side") and the surface of the outer hydrophilic sheet (corresponding to the non-skin-contacting side, abbreviated as "outer" in Table 1) before water absorption (hereinafter also referred to as dry time) The value of the maximum heat absorption rate qmax (kW/m ² ). The obtained results are shown in Table 1. The measured value is the average value of n=3.

Next, an acrylic resin plate (150 mm in length x 150 mm in width) was set on a horizontal plane, and wrinkles of each Example and each comparative example were placed on the acrylic resin plate. At this time, pay attention to setting the inner hydrophilic sheet on the side of the acrylic resin plate. The center of the pleats of each example and each comparative example, that is, on the center of the surface opposite to the acrylic resin plate of the outer hydrophilic sheet, a weight of 1.0 kPa was placed, and the pleats of each example and each comparative example Between the inner hydrophilic sheet and the acrylic resin plate, 0.5 ml of water was injected. After pouring water, the pleats of each Example and each comparative example were stretched until the pleats stopped stretching, and then retracted again to the original state. The above behavior was continued for 5 times. The surface (skin side) on the inner side of the hydrophilic sheet and the surface on the side of the outer hydrophilic sheet of each pleat of each embodiment and each comparative example after five times of stretching (hereinafter also referred to as after water absorption and stretching) were measured. The value of the maximum heat absorption rate qmax (kW/m ² ) of the surface (outer side). The obtained results are shown in Table 1. The measured value is the average value of n=3.

Next, the difference Δqmax (kW/m 2 ) between the value of qmax (kW/m ² ) and the value of qmax (kW/m ² ) during drying ^of each pleat in each example and each comparative example was obtained. value. The obtained results are shown in Table 1.

Here, the qmax value refers to the accumulation of a predetermined amount of heat on a hot plate of a certain area and a certain mass, which is the peak value of the heat flow of the accumulated heat to the sample at the low temperature side immediately after contacting the surface of the sample, and the larger the qmax value is The greater the body temperature captured when wearing, the higher the coldness of contact. In each of the Examples and each of the Comparative Examples in the present specification, the cold feeling upon contact is extremely related to the amount of moisture that the poured water diffuses in each sheet. Therefore, if the qmax value during drying and the qmax value after water absorption and contraction are measured for the same sample, the larger the Δqmax (kW/m ² ) value, the greater the increase in moisture content.

Table 1

As shown in the results shown in Table 1, in the wrinkles of Examples 1 to 3, the Δqmax (kW/m ² ) value on the outer side is larger than the Δqmax (kW/m ² ) value on the skin side, and it can be seen that the inner hydrophilic sheet was injected The water moves to the outside hydrophilic sheet. In contrast, 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 is large, and it can be seen that the water injected into the inner hydrophilic sheet is difficult to be hydrophilic to the outside. The water-based sheet moves and stays inside the inner hydrophilic sheet.

Therefore, the disposable diapers having the pleats of Examples 1 to 3 absorb sweat from the inner hydrophilic sheet, easily move to the outer hydrophilic sheet, and are less likely to be in a wet state, so rashes and the like are less likely to occur on the skin.

Industrial Applicability

According to the absorbent article of the present invention, the sweat diffusibility is high, and thus the occurrence of eczema, heat rash, rash, and the like can be reduced.

Claims (8)

1. disposable diaper, it possesses absorber from drosal part to veutro portion in the central authorities of disposable diaper, is provided with the hydrophilic sheet material in belt portion, and this disposable diaper is characterised in that:

Said hydrophilic sheet material has: the inboard hydrophilic sheet material that forms skin abutment face; With the outside hydrophilic sheet material of non-skin abutment face one side that is arranged on this inboard hydrophilic sheet material, these sheet materials are arranged on the lumbar region in the zone between the end limit of end limit and said absorber of comprising of said drosal part of said belt portion,

Comprising the said belt portion of said outside hydrophilic sheet material and said inboard hydrophilic sheet material, the state so that the width at said disposable diaper stretches forms fold through being arranged on the inner waist elastic members of said belt portion,

Said outside hydrophilic sheet material is higher than the liquid diffusibility of said inboard hydrophilic sheet material.

2. disposable diaper as claimed in claim 1 is characterized in that:

The formation fiber of said outside hydrophilic sheet material is in the width orientation of said disposable diaper.

3. according to claim 1 or claim 2 disposable diaper is characterized in that:

Said inboard hydrophilic sheet material is than the easy compression of said outside hydrophilic sheet material.

4. like each described disposable diaper in the claim 1～3, it is characterized in that:

Said outside hydrophilic sheet material is higher than the density of said inboard hydrophilic sheet material.

5. like each described disposable diaper in the claim 1～3, it is characterized in that:

Said outside hydrophilic sheet material is higher than the transpiration property of said inboard hydrophilic sheet material.

6. like each described disposable diaper in the claim 1～5, it is characterized in that:

Said disposable diaper is a flat type disposable diaper,

Said inboard hydrophilic sheet material forms the face sheet of liquid permeability,

Said outside hydrophilic sheet material is made up of the 2 blocks of sheet materials that the zone disposed between the pull stap that is provided with respectively in the limit, the left and right sides of said drosal part portion,

Said waist elastic members is arranged between 2 blocks of said outside hydrophilic sheet materials.

7. like each described disposable diaper in the claim 1～5, it is characterized in that:

Said disposable diaper is a pull-on disposable diaper,

Said inboard hydrophilic sheet material and said outside hydrophilic sheet material; On the skin abutment face of return portion, be set at the width of said disposable diaper; Wherein, said return portion is turned back the outer layer sheet of the outsourcing material that constitutes disposable diaper and is formed in said lumbar region

Said waist elastic members is arranged on said outer layer sheet and is configured between the internal layer sheet material of skin abutment face one side of this outer layer sheet.

8. like each described disposable diaper in the claim 1～5, it is characterized in that:

Said disposable diaper is a pull-on disposable diaper,

Said inboard hydrophilic sheet material constitutes return portion, and wherein, said return portion is turned back the outer layer sheet of the outsourcing material that constitutes disposable diaper and formed in said lumbar region,

Said outside hydrophilic sheet material forms the internal layer sheet material of skin abutment face one side that is provided in said outer layer sheet,

Said waist elastic members is arranged between said outer layer sheet and the said outside hydrophilic sheet material.

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