JP7228368B2 - disposable diaper - Google Patents

Description

The present invention relates to disposable diapers.

BACKGROUND ART Disposable diapers are known that use a sheet material having a plurality of apertures at a portion that comes into contact with the wearer's skin from the viewpoint of moisture migration, absorption, breathability, etc. such as perspiration.
For example, the present applicant previously proposed that an elastic member is arranged between the inner layer sheet member and the outer layer sheet member in a state of being stretched in the lateral direction of the diaper, and a plurality of elastic members penetrating the inner layer sheet member and the outer layer sheet member. An outer body having through-holes is provided on the non-skin facing side of the absorbent body including the absorbent body, and the sheet located near the absorbent body is more likely than the sheet located farther from the absorbent body. proposed a disposable diaper in which the opening area of the through holes is small (Patent Document 1).

In addition, the present applicant has proposed that the back waist flap has a hydrophobic skin-side sheet and a hydrophilic non-skin-side sheet, and the skin-side sheet has a depression and an opening penetrating the skin-side sheet into the depression. proposed a disposable diaper in which the thickness of the recessed portion becomes smaller as it approaches the opening (Patent Document 2).

Patent Document 3 discloses a non-woven fabric used as a topsheet of a diaper, which has a fineness of 1 dtex or less and a length of at least 30 mm, and is provided with a predetermined weight of fine fibers bonded by hydroentangling. , describes a nonwoven fabric that has been carded prior to hydroentangling and is perforated by hydroentangling.

JP 2015-107223 A JP 2017-113187 A Japanese translation of PCT publication No. 2009-532590

According to the diaper described in Patent Literature 1, the plurality of through-holes in the exterior body improves breathability compared to a diaper without holes. Further, according to the diaper described in Patent Document 2, the hydrophilic layer adjacent to the sheet having openings in the hydrophobic layer on the skin side can absorb sweat. However, the breathability may decrease after absorbing sweat, and it has been difficult to increase both the absorbency of sweat and the breathability after absorbing liquid. Patent Document 3 does not describe anything about breathability after the sheet absorbs sweat.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a disposable diaper capable of overcoming the drawbacks of the prior art.

The present invention includes a ventral portion arranged on the ventral side of the wearer, a dorsal portion arranged on the dorsal side of the wearer, and a crotch portion positioned between them, and the ventral portion and A disposable diaper having an absorbent body extending between the back side part and the back side part, wherein the back side part and the abdominal side part are each formed of a plurality of nonwoven fabrics outward from the end part of the absorbent body a waist flap portion, and at least in the dorsal portion, the waist flap portion has at least one hydrophilic region extending along the width direction and a non-hydrophilic region adjacent to the hydrophilic region; , in the hydrophilic region, one of the plurality of nonwoven fabrics is a hydrophilic nonwoven fabric, the hydrophilic nonwoven fabric has a plurality of apertures, and the number of pores per unit area of the non-hydrophilic region is Provided is a disposable diaper in which the total area of the parts is smaller than the total area of the perforations per unit area of the hydrophilic nonwoven fabric.

According to the disposable diaper of the present invention, both breathability and sweat absorption can be achieved, and breathability can be maintained even after sweat is absorbed, and skin troubles such as eczema can be reduced. .

FIG. 1 is a perspective view showing a usage state (wearing state) of an underpants-type disposable diaper according to an embodiment of the present invention. FIG. 2 is a partially broken plan view showing the unfolded and stretched state of the underpants-type disposable diaper shown in FIG. FIG. 3 is an enlarged sectional view taken along line II-II of FIG. 4 is a schematic plan view schematically showing a hydrophilic region and a non-hydrophilic region in the back waist flap portion shown in FIG. 2. FIG. FIGS. 5(a) and 5(b) are explanatory diagrams for explaining a method for measuring Klemm's water absorption height. FIG. 6 is an explanatory diagram for explaining the position of the boundary line BL that separates the hydrophilic portion and the non-hydrophilic portion in the partially hydrophilic nonwoven fabric. FIGS. 7A and 7B are plan views illustrating arrangement patterns of apertures in hydrophilic regions and non-hydrophilic regions according to the present invention. FIG. 8 is an explanatory diagram for explaining a method of calculating the number of openings per unit area. Fig. 9(a) is a view equivalent to Fig. 3 showing another embodiment of the back side waist flap portion according to the present invention, and Fig. 9(b) is a sheet constituting the exterior body of Fig. 9(a). It is sectional drawing which shows the state before folding. FIG. 10 is an enlarged sectional view schematically showing the hydrophilic region shown in FIG. 9(a). FIG. 11 is a view equivalent to FIG. 3 showing still another embodiment of the back side waist flap portion according to the present invention. FIG. 12 is a view equivalent to FIG. 3 showing still another embodiment of the back side waist flap portion according to the present invention. FIG. 13 is a diagram showing still another embodiment of the back waist flap portion according to the present invention, and is a cross-sectional view showing side by side cross sections of the back waist flap portion and the abdomen side waist flap portion along the longitudinal direction of the diaper. . FIG. 14 is a view equivalent to FIG. 4 showing still another embodiment of the back side waist flap portion according to the present invention. FIG. 15 is a perspective view showing one embodiment of a raw fabric roll of partially hydrophilic nonwoven fabric.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on its preferred embodiments with reference to the drawings. 1 to 3 show an underpants-type disposable diaper 1 that is one embodiment of the absorbent article of the present invention. As shown in FIG. 1, the diaper 1 has an abdominal portion A arranged on the abdomen side of the wearer when the diaper 1 is worn, a dorsal portion B arranged on the dorsal side of the wearer, and these portions. and a crotch portion C positioned therebetween. The diaper 1 has a longitudinal direction X corresponding to the front-rear direction of the wearer, that is, a direction extending from the abdomen to the back through the crotch, and a width direction Y perpendicular thereto. As shown in FIG. 2, the diaper 1 is formed symmetrically with respect to a longitudinal center line CL extending in the longitudinal direction X and bisecting the diaper 1 in the width direction Y. As shown in FIG.

The diaper 1 has an absorbent body 23 extending between the abdominal portion A and the dorsal portion B. As shown in FIG. The absorbent body 23 is composed of a liquid-retaining absorbent core (not shown) and a core wrap sheet (not shown) that is in contact with and wraps the outer surface of the absorbent core. The diaper 1 includes an absorbent main body 2 including an absorbent body 23 in the central portion in the width direction Y, and the non-skin facing side of the absorbent main body 2, that is, the side farther from the wearer's body than the absorbent main body 2. Both side edges along the longitudinal direction X of the exterior body 3 in each of the ventral part A and the dorsal part B are bonded by a known bonding such as an adhesive, heat sealing, ultrasonic sealing, etc. A pair of side seal portions S, S and a waist opening WH through which the wearer's torso is passed, and a pair of leg openings LH through which the wearer's lower legs are passed (only one shown), joined to each other by means is formed.

As used herein, the term “skin-facing surface” refers to the surface of the absorbent article or its constituent members (eg, topsheet) facing the wearer's skin when the absorbent article is worn, that is, the surface facing the wearer's skin. The "non-skin facing surface" is the side of the absorbent article or its constituent members that faces away from the skin when the absorbent article is worn, i.e., the side that is relatively far from the wearer's skin. on the side. The term "when worn" as used herein means a state in which the absorbent article is maintained in a normal and appropriate wearing position, that is, the correct wearing position of the absorbent article.

The absorbent main body 2 has a rectangular shape in plan view when the diaper 1 is unfolded and stretched as shown in FIG. aligned with the longitudinal direction X of the diaper 1 in the unfolded and stretched state, arranged in the center of the outer body 3 in the width direction Y, and joined to the outer body 3 with an adhesive. The "unfolded and stretched state" of the diaper 1 means that the diaper 1 is cut off at the side seal portion S to be in the unfolded state, and the elastic members of each part of the diaper 1 in the unfolded state are stretched to the design size (the influence of the elastic member is completely removed). It means the state in which it is expanded until it becomes the same dimension as when it is expanded in a flat state in the excluded state).

As shown in FIG. 3, the absorbent body 2 comprises a liquid-permeable top sheet 21 forming a skin-facing surface and a liquid-impermeable, liquid-impermeable or water-repellent back sheet 22 forming a non-skin facing surface. , and a liquid-retaining absorber 23 interposed between the sheets 21 and 22, which are integrated by a known bonding means such as an adhesive. The total length in the longitudinal direction X of the absorbent body 2 is substantially the same as that of the absorbent body 23 , and both longitudinal edges 23 a and 23 b of the absorbent body 23 are at the same positions as the longitudinal edges of the absorbent body 2 . As the top sheet 21 and the back sheet 22, various types of materials conventionally used for this type of absorbent article can be used without particular limitation. For example, various non-woven fabrics, perforated films, etc. can be used as the top sheet 21, and resin films, laminates of resin films and non-woven fabrics, etc. can be used as the back sheet 22. FIG.

The absorber 23 has a rectangular shape elongated in the longitudinal direction X in plan view as shown in FIG. As the absorbent material that forms the main body of the absorbent core in the absorbent body 23, any material that is used as the absorbent body material in this type of absorbent article can be used without particular limitation. and synthetic fibers, water-absorbent polymers, and the like. A typical form of the absorbent core is a fiber assembly of hydrophilic fibers such as wood pulp, or a fiber assembly holding a particulate water-absorbent polymer.

In the diaper 1, the core wrap sheet covers the entire skin-facing surface and non-skin-facing surface of the absorbent core. The core wrap sheet may be one continuous sheet, and one skin-side core wrap sheet covering the skin-facing surface of the absorbent core and the skin-side core wrap sheet are separate and absorbent The non-skin-side core wrap sheet covering the non-skin-facing surface of the core may also be included. As the core wrap sheet, liquid-permeable sheets such as paper, various nonwoven fabrics, and perforated films can be used. The absorbent core and core wrap sheet may be joined by a known joining means such as a hot melt adhesive.

As shown in FIGS. 2 and 3, both sides along the longitudinal direction X of the skin-facing surface of the absorbent body 2 are formed of liquid-resistant or water-repellent and air-permeable leak-proof cuff-forming sheets. A pair of leaktight cuffs 26, 26 are provided. Each leak-preventing cuff 26 has one or more filament-like leak-preventing cuff-forming elastic members arranged in a stretched state in the longitudinal direction X. When the elastic member contracts when the diaper 1 is worn, at least the crotch area is stretched. It stands up at the portion C, thereby preventing the outflow of the excreted fluid such as urine to the outside in the width direction Y.

The outer body 3 forms the outer shape of the diaper 1 in the unfolded and stretched state as shown in FIG. It forms the outline of each dorsal part B. As shown in FIG. 2 , the outer body 3 is longer in the width direction Y at the ventral part A and the dorsal part B than at the crotch part C. As shown in FIG. In other words, in the crotch portion C, both side edge portions along the longitudinal direction X of the exterior body 3 are curved in a convex arc shape toward the center in the width direction Y, and in plan view as shown in FIG. The central region in the longitudinal direction X is constricted inward in the width direction Y.

As shown in FIG. 3, the outer body 3 is a laminate of an outer layer sheet 31 that forms the outer surface, that is, the non-skin facing surface of the diaper 1 in the worn state, and an inner layer sheet 32 that is arranged to face the skin facing surface of the outer layer sheet 31. Consists of a body. When the diaper 1 is worn, the outer layer sheet 31 is located farther from the wearer's body and forms the non-skin facing surface (outer surface) of the diaper 1, and the inner layer sheet 32 is located closer to the wearer's body. As a result, the skin facing surface (inner surface) of the diaper 1 is formed. The outer layer sheet 31 and the inner layer sheet 32 are joined to each other at a predetermined site through a joining means such as an adhesive.

In the back side portion B of the diaper 1, the outer layer sheet 31 has a folded portion 31a extending from the edge of the inner layer sheet 32 in the longitudinal direction X and folded back toward the skin facing side of the inner layer sheet 32, as shown in FIG. The folded portion 31a covers the edge portion in the longitudinal direction X of the absorbent main body 2. As shown in FIG. That is, the outer layer sheet 31 has a folded portion 31a folded back toward the inner surface (skin-facing surface) of the diaper 1 and a non-folded portion 31b forming the outer surface (non-skin-facing surface) of the diaper 1. . The folding position of the outer layer sheet 31 coincides with the peripheral edge WE of the waist opening WH. On the other hand, the inner layer sheet 32 is not folded. The outer layer sheet 31 also has similar folded portions and non-folded portions on the abdominal side portion A side of the diaper 1 .

Nonwoven fabrics manufactured by various methods can be used as the sheet constituting the exterior body 3, such as the outer layer sheet 31 or the inner layer sheet 32. For example, spunbond nonwoven fabrics, air-through nonwoven fabrics, spunlace nonwoven fabrics, heat roll nonwoven fabrics, meltblown nonwoven fabrics, Alternatively, a laminated nonwoven fabric of these may be used. The nonwoven fabric described above can also be used for the auxiliary sheet described later.

The back side portion B and the abdominal side portion A of the diaper 1 respectively have waist flap portions formed of a plurality of nonwoven fabrics outward from the end portions 23A, 23B of the absorbent body 23 . The waist flap portion is a region between the pair of side seal portions S, S in the width direction Y, and is a region extending outward in the longitudinal direction X from the edge of the absorbent body 23 in the longitudinal direction X, and the absorbent It is a region between each side edge in the longitudinal direction X of the body 23 and each side seal portion S. In this embodiment, the maximum length L (see FIG. 4) of the waist wrap portion in the longitudinal direction X is equal to the total length of the side seal portion S in the longitudinal direction X. As shown in FIG. Hereinafter, the waist flap portion in the dorsal portion B will also be referred to as the dorsal waist flap portion Fb, and the waist flap portion in the ventral portion A will also be referred to as the ventral waist flap portion Fa. Specifically, the back side waist flap portion Fb extends in the width direction Y from the edge 23b of the rear end portion 23B on the back side portion B side in the longitudinal direction X of the absorber 23, positioned outward in the longitudinal direction X. A region b1 and a region b2 extending outward in the width direction Y from the side edge of the rear end portion 23B on the back side portion B side in the longitudinal direction X of the absorbent body 23 are combined. In addition, the abdomen portion A of the diaper 1 has an abdomen waist flap portion Fa extending outward from the end portion of the absorber 23 . The ventral waist flap portion Fa includes a region a1 extending in the width direction Y from the edge 23a of the front end portion 23A on the ventral portion A side in the longitudinal direction X of the absorbent body 23, and the absorbent body. 23 means a region including a region a2 extending in the width direction Y from the side edge of the front end portion 23A on the side of the ventral portion A in the longitudinal direction X of 23 .

In this embodiment, the back side waist flap portion Fb is composed of the exterior body 3 extending outward in the longitudinal direction X from the edge 23b of the absorbent body 23 in the same direction X. As shown in FIG. Specifically, as shown in FIG. 3, the dorsal waist flap portion Fb includes the folded portion 31a and the non-folded portion 31b of the outer layer sheet 31, and the inner layer located between the folded portion 31a and the non-folded portion 31b. It has a laminated structure in which the sheet 32 is laminated. Thus, the dorsal waist flap portion Fb is composed of a plurality of nonwoven fabrics. When the nonwoven fabric folded back at the back side waist flap portion is included, the nonwoven fabric is defined as two nonwoven fabrics. The dorsal waist flap portion Fb may be made of the nonwoven fabric that forms the exterior body 3, or may be made of the nonwoven fabric that forms the exterior body 3 and other nonwoven fabrics.

The back waist flap portion Fb has at least one hydrophilic region 40 extending along the width direction Y and a non-hydrophilic region 45 adjacent to the hydrophilic region 40 . In hydrophilic region 40, one of the plurality of nonwoven fabrics is a hydrophilic nonwoven fabric. That is, the hydrophilic region 40 in the back waist flap portion Fb means a region in which the hydrophilic nonwoven fabric exists in the thickness direction of the diaper, and the hydrophilic nonwoven fabric may be overlapped with the hydrophobic nonwoven fabric in the hydrophilic region. . Conversely, the non-hydrophilic region 45 means a portion where the hydrophilic nonwoven fabric does not exist in the thickness direction of the diaper, and is composed of one or more hydrophobic nonwoven fabrics. In this embodiment, the hydrophilic nonwoven fabric 41 is a partially hydrophilic nonwoven fabric having a partially hydrophilic region, and the hydrophilic portion of the partially hydrophilic nonwoven fabric is the hydrophilic region 40. . A partially hydrophilized nonwoven fabric has hydrophilized regions. On the other hand, a non-hydrophilic region 45 is a non-hydrophilized portion of the partially hydrophilic non-woven fabric, where no other hydrophilic non-woven fabric 41 exists in the thickness direction of the diaper. The hydrophilic region 40 may have one hydrophilic nonwoven fabric, or may have two or more hydrophilic nonwoven fabrics.

The hydrophilic nonwoven fabric 41 contains hydrophilic fibers so that the whole or a part thereof is hydrophilic. The hydrophilic nonwoven fabric 41 and the non-hydrophilic region 45 are distinguished by the measured value of <Klemm water absorption height> described later.

FIG. 4 is a schematic plan view schematically showing the arrangement of hydrophilic regions 40 and non-hydrophilic regions 45 in this embodiment. In this embodiment, the hydrophilic region 40 and the non-hydrophilic region 45 extend over the entire width direction Y of the back waist flap portion Fb, and are divided into two non-hydrophilic regions in the longitudinal direction X, as shown in FIG. Areas 45 are positioned so as to sandwich the hydrophilic area 40 . The hydrophilic region 40 is adjacent to the non-hydrophilic region 45 in the longitudinal direction X. As shown in FIG. The hydrophilic region 40 may be adjacent to the non-hydrophilic region 45 in the width direction Y. In FIG. 4, illustration of the elastic member 33 is omitted.

The hydrophilic nonwoven fabric 41 has a plurality of apertures 50 as shown in FIGS. In the hydrophilic nonwoven fabric 41, the openings 50 are arranged in a dotted pattern. In this embodiment, as shown in FIG. 4, the non-woven fabric forming the non-hydrophilic region 45 also has a plurality of apertures 55, but the illustration of the apertures 55 is omitted in FIG. . The openings 50 in the hydrophilic nonwoven fabric 41 are also referred to as first openings 50 , and the openings 55 in the nonwoven fabric forming the non-hydrophilic regions 45 are also referred to as second openings 55 . These pores do not include gaps between fibers constituting the nonwoven fabric and slits extending in one direction through the nonwoven fabric. That is, the aperture has an area of 0.1 mm ² or more and 20 mm ² or less.

The hydrophilic non-woven fabric 41 and the non-hydrophilic region 45 differ in the total area of the openings 50 and 55 per unit area (100 mm ² of 10 mm square). That is, the total areas of the first openings 50 and the second openings 55 per unit area are different. The total area of the second openings 55 per unit area of the non-hydrophilic region 45 is smaller than the total area of the first openings 50 per unit area of the hydrophilic nonwoven fabric 41 .

When a plurality of non-hydrophilic regions 45 are laminated with a plurality of non-woven fabrics, and the total area of the second openings 55 per unit area of each non-woven fabric is different, the non-woven fabric with the largest total area is selected, and the unit of the non-woven fabric Let the total area of the second openings 55 per unit area be the total area of the second openings 55 per unit area of the non-hydrophilic region 45 . Moreover, some or all of the non-woven fabrics in the non-hydrophilic region 45 may not have the second apertures 55 .
When a plurality of hydrophilic nonwoven fabrics 41 are laminated in the hydrophilic region 40 and the total area of the first apertures 50 per unit area of these hydrophilic nonwoven fabrics 41 is different, the hydrophilic nonwoven fabric with the smallest total area is selected. The total area of the first openings 50 per unit area in the hydrophilic nonwoven fabric is the total area of the first openings 50 per unit area of the hydrophilic region 40 .

The diaper 1 is put on by the wearer in the same manner as a normal diaper. The back side waist flap portion Fb is in contact with the skin around the wearer's waist when worn, and the hydrophilic nonwoven fabric 41 of the hydrophilic region 40 absorbs sweat of the wearer.
By the way, the inventors of the present invention have found that conventional diapers using a liquid-absorbent sheet made of hydrophilic nonwoven fabric form a liquid film between fibers by absorbing sweat, and as a result, the air permeability after liquid absorption is reduced from that of the hydrophobic nonwoven fabric. It was found that it was lower than the non-hydrophilic region. A decrease in breathability causes an increase in humidity inside the diaper, which in turn can cause skin troubles.
On the other hand, the back side waist flap portion Fb of the diaper 1 is absorbed by the hydrophilic nonwoven fabric 41 because the total area per unit area of the first and second openings 50 and 55 has the above-described size relationship. It is difficult for the perspiration to form a liquid film in the first openings 50, and the decrease in breathability due to the absorbed perspiration is suppressed. As a result, even if the hydrophilic region 40 absorbs sweat, good air permeability is maintained through the first openings 50 .
In addition, since the total area per unit area of the openings 50 in the hydrophilic region 40 is larger than the total area per unit area of the openings 50 in the non-hydrophilic region 45, the hydrophilic region is positively ventilated, Sweat absorbed by the hydrophilic nonwoven fabric 41 can be efficiently evaporated.
According to the diaper 1, in this way, both sweat absorption and breathability are achieved, and even if the sweat is absorbed, an increase in humidity inside the diaper is suppressed, and the absorbed sweat and the sweat remain on the skin. By efficiently evaporating sweat, excellent effects such as reduction of skin troubles such as eczema due to stuffiness can be achieved.

The non-hydrophilic region 45 is a portion where the hydrophilic nonwoven fabric 41 is not arranged. That is, the non-hydrophilic region 45 is a portion where only the hydrophobic nonwoven fabric 46 is arranged. The non-hydrophilic region 45 may extend in the longitudinal direction X. For example, the non-hydrophilic region 45 may extend from the rear end portion 23B of the absorbent body 23 to the front end portion 23A of the absorbent body 23 via the crotch portion C in the longitudinal direction X. Thus, the non-hydrophilic region 45 may exist not only in the waist flap portion but also in the crotch portion C. Since the hydrophilic nonwoven fabric 41 is more hydrophilic than the hydrophobic nonwoven fabric 46 , it absorbs sweat more easily than the hydrophobic nonwoven fabric 46 . The hydrophilic nonwoven fabric 41 and the hydrophobic nonwoven fabric 46 are distinguished by the following method.

<Measurement method of Klemm water absorption height>
A method for measuring the Klemm water absorption height will be described with reference to FIG. The Klemm water absorption height is measured according to JIS-P8141. First, a plurality of nonwoven fabrics forming the back side waist flap portion are cut out from the diaper. At this time, each nonwoven fabric is cut out so that the lamination position in the back side waist flap portion can be specified. From each non-woven fabric, a measurement piece having a length in the longitudinal direction corresponding to the entire length of the side seal portion in the same direction and a length of 200 mm in the width direction of the diaper around the longitudinal center line CL is cut out. A marked line extending in the longitudinal direction X at a position 15 mm in the width direction Y from the right end R of the strip-shaped measurement piece with the width direction Y as the vertical direction as seen from the side of the skin facing side in the width direction Y Pull SL, attach a weight such as a clip to the right end R, gently immerse the end R to the marked line SL in water for 10 minutes [see FIG. 5(a)]. After that, water is sucked up from the mark line SL upward in the longitudinal direction of the measuring piece. In the longitudinal direction of the measurement piece, the length of the portion where water is sucked up from the mark SL, that is, the portion where the Klemm water absorption height is more than 5 mm is defined as the “hydrophilic portion”, and the portion where the Klemm water absorption height is 5 mm or less. It is referred to as a “non-hydrophilic portion”. In a hydrophilic nonwoven fabric that is entirely hydrophilic, the entire length of the measuring piece in the width direction becomes a hydrophilic portion. A non-hydrophilic non-woven fabric forms a non-hydrophilic portion over the entire length of the measuring piece in the transverse direction. In the partially hydrophilic non-woven fabric, a portion of the measurement piece in the width direction is a hydrophilic portion, and the other portion in the width direction is a non-hydrophilic portion.
The Klemm water absorption height is obtained from the area and dimensions of the portion where water is sucked up. Specifically, in the lateral direction (longitudinal direction of the diaper) of the measurement piece, the bisector CL1 that bisects the length of the portion where the water is sucked up in the lateral direction (Fig. 5(b) Reference] is defined as an evaluation area S0 with a width of 20 mm and a length of 180 mm from the marked line SL. is divided by the width W3 (20 mm) of the evaluation area. This measurement is repeated three times, and the average value of these measurements is taken as the Klemm water absorption height.

In a partially hydrophilic nonwoven fabric, a single nonwoven fabric has a plurality of regions with different pore arrangement patterns. The arrangement pattern of the openings means that the shape and size of the openings and the arrangement of the openings are in a predetermined form. In the partially hydrophilized nonwoven fabric, the measurement piece in <Method for measuring Klemm water absorption height> is cut out for each arrangement pattern of the openings, or as shown in FIG. Measure the Klemm water absorption height. When the measurement piece is cut out for each arrangement pattern of the openings, the center line that bisects the length between the arrangement pattern of one opening and the arrangement pattern of the other opening is Assuming that the arrangement pattern is a different boundary line, a measurement piece is cut out at random after leaving an interval of 10 mm from the center line to the arrangement pattern side of one opening or the arrangement pattern side of the other opening. . The center line bisects the outer edges of the apertures of different arrangement patterns closest to the boundary between the arrangement pattern of one aperture and the arrangement pattern of the other aperture, and the width A straight line extending in the Y direction. For example, a straight line extending in the width direction Y bisects the outer edge of the first opening closest to the boundary and the outer edge of the second opening. Of the plurality of measurement pieces cut out from the partially hydrophilic nonwoven fabric in this manner, some of the measurement pieces become hydrophilic portions, and the other measurement pieces become non-hydrophilic portions.

The hydrophilic portion preferably has a Klemm water absorption height of 5 mm or more, more preferably 10 mm or more, and preferably 180 mm or less, and more preferably 5 mm or more and 180 mm or less, more preferably 10 mm or more and 180 mm or less.
The non-hydrophilic portion preferably has a Klemm water absorption height of 0 mm or more, preferably 4 mm or less, more preferably 3 mm or less, and more preferably 0 mm or more and 4 mm or less, more preferably 0 mm or more and 3 mm or less. .
The Klemm water absorption heights of the hydrophilic portion and the non-hydrophilic portion are preferably within the above range at the dorsal waist flap portion Fb, more preferably at the dorsal and ventral waist flap portions.

When the component (e.g., inner layer sheet) is removed from an absorbent article such as a diaper and evaluated and measured, if the component is fixed to another component by an adhesive, fusion, or the like, it must be fixed. Measure on the loose part or remove the fixed part before taking it out. At that time, from the viewpoint of minimizing the effect on the hydrophilizing agent given to the constituent members, the method of removing the fixed part may cause deterioration or loss of the oil, such as applying a solvent or blowing hot air from a dryer. It is preferable not to adopt certain methods.
In addition, as shown in FIG. 9, which will be described later, when the component is fixed to another nonwoven fabric or elastic member in the waist flap portion by adhesive, fusion, etc., measurement can be performed while it is fixed. good. At that time, a weight is attached to the end portion R so that the nonwoven fabric is in a sufficiently stretched state, and the cross section of the target component is submerged in water.

After distinguishing the hydrophilic nonwoven fabric 41 and the hydrophobic nonwoven fabric 46 by the method described above, or distinguishing the hydrophilic part and the non-hydrophilic part in the partially hydrophilic nonwoven fabric, the lamination position of each nonwoven fabric in the back waist flap part Fb is determined. Specifically, the hydrophilic region 40 and the non-hydrophilic region 45 in the dorsal waist flap portion Fb are distinguished, and the arrangement pattern of the apertures in the hydrophilic region and the arrangement pattern of the apertures in the non-hydrophilic region are specified. In the ventral waist flap portion Fa as well, the hydrophilic region 40 and the non-hydrophilic region 45 are distinguished by the same method as in the dorsal waist flap portion Fb, and the arrangement pattern of the openings in the hydrophilic region and the openings in the non-hydrophilic region are determined. The arrangement pattern of the part is specified.

The partially hydrophilic nonwoven fabric is divided into hydrophilic portions and non-hydrophilic portions, and then the arrangement pattern of the openings of the hydrophilic regions 40 and the arrangement pattern of the openings of the non-hydrophilic regions 45 are specified. In this case, the boundary line BL that separates the hydrophilic portion and the non-hydrophilic portion in the partially hydrophilic non-woven fabric is 10 mm away from the boundary opening straight line K2 on the non-hydrophilic portion side in the longitudinal direction X (upward in FIG. 6). and a position spaced 10 mm outward in the longitudinal direction X (downward in FIG. 6) from the boundary opening straight line K3 on the hydrophilic portion side. The boundary opening straight line K2 passes through the portion closest to the hydrophilic portion in the longitudinal direction X among the outer edges of the opening 55 located closest to the hydrophilic portion in the longitudinal direction X in the non-hydrophilic portion, and extends in the width direction. It is a straight line extending in Y. The boundary opening straight line K3 passes through the portion closest to the non-hydrophilic portion in the longitudinal direction X of the outer edge of the opening 50 located closest to the non-hydrophilic portion in the longitudinal direction X in the hydrophilic portion, and extends along the width A straight line extending in the Y direction. Further, the boundary line BL is formed on the hydrophilic part side and the non-hydrophilic part side with the boundary opening straight line K2 as the center, where L2 is the length of the perpendicular connecting the distal opening straight line K1 and the boundary opening straight line K2. It may be positioned within 10% of the length L2 on the hydrophilic portion side. The distal opening straight line K1 passes through the portion farthest from the non-hydrophilic portion in the longitudinal direction X among the outer edges of the opening furthest from the non-hydrophilic portion in the longitudinal direction X in the hydrophilic portion, and extends in the width direction Y. Straight line. In the partially hydrophilic nonwoven fabric, the boundary line BL that separates the hydrophilic portion and the non-hydrophilic portion can be confirmed by the above-described <Method for Measuring Klemm Water Absorption Height>.

From the viewpoint of more reliably absorbing sweat, the length L1 (see FIG. 4) of the hydrophilic region 40 in the longitudinal direction X is the shortest length L (see FIG. 4) from the peripheral edge of the leg opening LH to the peripheral edge WE of the waist opening 4), preferably 10% or more, more preferably 20% or more, preferably 100% or less, more preferably 90% or less, and preferably 10% or more and 100% or less, more It is preferably 20% or more and 90% or less. In both the dorsal waist flap portion Fb and the ventral waist flap portion Fa, the length of the hydrophilic region 40 in the longitudinal direction X with respect to the shortest length L from the peripheral edge of the leg opening LH to the peripheral edge WE of the waist opening It is preferable that the ratio of L1 is within the range described above.
From the same viewpoint as above, the length L1 (see FIG. 4) of the hydrophilic region 40 in the longitudinal direction X is preferably 10 mm or more and 180 mm or less, more preferably 20 mm or more and 160 mm or less in the case of an adult diaper. In the case of diapers, it is preferably 10 mm or more and 140 mm or less, more preferably 20 mm or more and 126 mm or less.

From the viewpoint of more reliably absorbing sweat, the length W1 in the width direction Y of the hydrophilic region 40 (see FIG. 4) is preferably 30% longer than the maximum length W in the width direction Y of the dorsal waist flap portion Fb. % or more, more preferably 40% or more, preferably 100% or less, more preferably 30% or more and 100% or less, more preferably 40% or more and 100% or less. The ratio of the length W1 in the width direction Y of the hydrophilic region 40 to the maximum length in the width direction Y of the ventral waist flap portion Fa is also preferably within the range described above.
From the same viewpoint as above, the length W1 (see FIG. 4) of the hydrophilic region 40 in the width direction Y is preferably 200 mm or more and 650 mm or less, more preferably 300 mm or more and 550 mm or less in the case of an adult diaper. In the case of diapers, the length is preferably 100 mm or more and 500 mm or less, more preferably 200 mm or more and 470 mm or less.

For the total area per unit area of the first and second apertures 50 and 55, the measurement piece of <Method for Measuring Klemm Water Absorption Height> described above is used. After specifying whether this measurement piece is a hydrophilic nonwoven fabric 41 or a hydrophobic nonwoven fabric 46, or if the measurement piece is a partially hydrophilic nonwoven fabric, the hydrophilic portion and non-hydrophilic portion of the nonwoven fabric are specified. After that, the total area per unit area of the openings is measured by the following method.

<Method for measuring total area of pore per unit area>
The total area of pore per unit area (100 mm ² of 10 mm square) in the measurement piece of <Method for Measuring Klemm Water Absorption Height> described above is measured using an image analyzer. The portion of the measurement piece that has absorbed water is dried in advance. The measurement is repeated at any three locations (100 mm ² of 10 mm square) on the measurement piece, and the average value of these measurements is taken as the total area of the openings per unit area. When the nonwoven fabric is a partially hydrophilic nonwoven fabric, the total area of perforations per unit area is measured at arbitrary three locations (100 mm ² of 10 mm square) of the hydrophilic portion, and the average value of these is taken as the unit area of the hydrophilic region. It is the total area of the perforated area. For the non-hydrophilic portion of the partially hydrophilic nonwoven fabric, the total area of pores per unit area is measured by the same method. As an image analysis device, for example, VHX-1000 manufactured by KEYENCE can be used.

From the viewpoint of improving breathability and sweat absorption, the total area of the second openings 55 per unit area (100 mm ² of 10 mm square) is equal to that of the first openings per unit area (100 mm ² of 10 mm square). With respect to the total area of the part 50, preferably 75% or less, more preferably 65% or less, preferably 0% or more, more preferably 10% or more, and preferably 0% or more and 75% or less, More preferably, it is 10% or more and 65% or less. From the same viewpoint as above, the total area of the first openings 50 per unit area (100 mm ² of 10 mm square) is preferably 40 mm ² or less, more preferably 30 mm ² or less, and preferably 0.5 mm. ² or more, more preferably 1 mm ² or more, preferably 0.5 mm ² or more and 40 mm ^{2 or} less, and more preferably 1 mm ² or more and 30 mm ^{2 or} less. From the same viewpoint as above, the total area of the second openings 55 per unit area (100 mm ² of 10 mm square) is preferably 30 mm ² or less, more preferably 20 mm ² or less, and preferably 0 mm ² or more. , more preferably 0.5 mm ² or more, more preferably 0 mm ² or more and 30 mm ² or less, and more preferably 0.5 mm ² or more and 20 mm ^{2 or} less.

The hydrophilic nonwoven fabric 41 contains hydrophilic fibers so that the whole or a part thereof is hydrophilic. In this embodiment, the hydrophilic nonwoven fabric 41 has a partially hydrophilic region. In other words, the hydrophilic nonwoven fabric 41 of the present embodiment is a hydrophilized region (hydrophilic portion) in a partially hydrophilized nonwoven fabric. This partially hydrophilic nonwoven fabric is a nonwoven fabric having hydrophilic regions and non-hydrophilic regions. The “hydrophilized region” is the aforementioned hydrophilic portion. Instead of the partially hydrophilic nonwoven fabric, the hydrophilic nonwoven fabric 41 may be entirely hydrophilic by including hydrophilic fibers. In the hydrophilic region 40 , at least one of the outer layer sheet 31 and the inner layer sheet 32 constituting the exterior body 3 and the auxiliary sheet 4 is a hydrophilic nonwoven fabric 41 . The auxiliary sheet 4 is a separate sheet from the outer layer sheet 31 and the inner layer sheet 32, and is arranged to overlap the outer layer sheet 31 and the inner layer sheet 32 at the waist flap portion.

Contrary to the hydrophilic nonwoven fabric 41, the hydrophobic nonwoven fabric 46 mainly contains hydrophobic fibers as constituent fibers, so that the whole is hydrophobic. Hydrophilic fibers and hydrophobic fibers are distinguished by high and low contact angles. Specifically, if the contact angle of the fiber is smaller than 90°, it is judged to be a hydrophilic fiber with high hydrophilicity, and if the contact angle is 90° or more, it is judged to be a hydrophobic fiber with low hydrophilicity. . The contact angle of fibers is measured by the following method.

<Method for measuring contact angle>
In the <Method for Measuring Klemm Water Absorption Height> described above, fibers are taken out from the area specified as the hydrophilic non-woven fabric or the non-hydrophilic non-woven fabric. At this time, since the fiber is measured that does not absorb water, when collecting the fiber from the measurement piece of the above <Method for measuring Klemm water absorption height>, the fiber is removed from the portion of the measurement piece that does not absorb water. Collect. Alternatively, fibers are randomly sampled from the nonwoven fabric specified as the hydrophilic nonwoven fabric or from the region specified as the hydrophilic portion 43 based on the arrangement pattern of the openings, and these fibers are used as the fibers of the hydrophilic nonwoven fabric. Similarly, fibers are randomly sampled from the non-hydrophobic non-woven fabric or the region specified as the non-hydrophilic portion 47 and used as the hydrophobic non-woven fabric. Next, the water contact angle of the multiple samples of the fiber is measured. An automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used as a device for measuring the contact angle of fibers. Distilled water is used to measure the contact angle. The amount of liquid ejected from the inkjet method water droplet ejection part (Cluster Technology Co., Ltd., pulse injector CTC-25 with an ejection part hole diameter of 25 μm) is set to 10 picoliters, and water droplets are placed directly above the center of each fiber. Dripping. The state of dripping is recorded on a high-speed recording device connected to a camera placed horizontally. From the viewpoint of image analysis later, the recorder is preferably a personal computer with a built-in high-speed capture device. In this measurement, images are recorded every 17 msec. In the recorded image, the first image of water droplets landing on the fiber is captured by the attached software FAMAS (software version is 2.6.2, analysis method is droplet method, analysis method is θ / 2 method, image processing algorithm is non-reflective, the image processing image mode is frame, the threshold level is 200, and no curvature correction is performed. angle. The fiber is cut into a fiber length of about 10 mm, placed on a sample stand of a contact angle meter, and maintained horizontally. N = 5 contact angles are measured to one decimal place, and the average value (rounded to the first decimal place) of a total of ten measured values is defined as the contact angle. A lower contact angle means a higher hydrophilicity. The measurement environment is a room temperature of 22±2° C. and a humidity of 65±2% RH. The measurement is repeated three times, and the average value of the contact angles of these fibers is taken as the contact angle of the fiber.

The contact angle of the hydrophilic fibers is preferably 87 degrees or less, more preferably 80 degrees or less, still more preferably 65 degrees or less. Moreover, the contact angle of the non-hydrophilic fibers is preferably 90 degrees or more, more preferably 120 degrees or more.

The first apertures 50 and the second apertures 55 are different in the number per unit area, the area of each aperture, etc., so that the total area per unit area has the above-described size relationship. can be done. This size relationship is such that, for example, the number of openings 50 per unit area (100 mm ² of 10 mm square) of the hydrophilic nonwoven fabric 41 is the same as the number of openings per unit area (100 mm ² of 10 mm square) of the non-hydrophilic region 45 . This is achieved by having more than 55 (see FIG. 7(a)). Such an aspect is also called aspect (1). In the case of mode (1), from the viewpoint of improving air permeability, the number of second openings 55 per unit area is preferably 90% or less of the number of first openings 50 per unit area. , more preferably 80% or less, more preferably 0% or more, more preferably 10% or more, more preferably 0% or more and 90% or less, more preferably 10% or more and 80% or less. From the same viewpoint as above, the number of first openings 50 per unit area is 25 or less, more preferably 20 or less, and preferably 0.5 or more, more preferably 1. or more, preferably 0.5 or more and 25 or less, more preferably 1 or more and 20 or less. From the same viewpoint as above, the number of second openings 55 per unit area is 22.5 or less, more preferably 20 or less, and preferably 0 or more, more preferably 0.5. 05 or more, preferably 0 or more and 22.5 or less, more preferably 0.05 or more and 20 or less.

<Method for calculating the number of openings per unit area>
A method for calculating the number of openings per unit area will be described with reference to FIG. As for the number of openings, a reference range is assumed in the hydrophilic nonwoven fabric or the nonwoven fabric forming the non-hydrophilic region 45, and the number of openings within the reference range is counted. First, the first opening portion 50 will be described as an example. A 10 mm×10 mm measurement piece is randomly cut out from the hydrophilic nonwoven fabric. A plurality of first openings 50 having the same relative position in the longitudinal direction X and the width direction Y in the measuring piece is defined as one repeating unit Q1. The length of two repeating units Q1 arranged in the longitudinal direction X is defined as the length e1 of the reference range B1 in the longitudinal direction X, and the length of two repeating units Q1 arranged in the width direction Y is the length w1 in the width direction Y of the reference range B1. Next, the number of openings within the reference range B1 is counted. Next, the area (w1×e1) of the reference range B1 is calculated, and the number n1 of the apertures within the reference range B1 is divided by the area of the reference range B1 to convert to the number of apertures per unit area. The number of first apertures per unit area is calculated by the following formula (1). When the first opening is partially present near the outer edge of the sample piece, the opening is counted as 1/2. Three or more measurement pieces are collected, the average number of openings per unit area is obtained, and the average value is taken as the number of openings per unit area.

When the hydrophilic nonwoven fabric is a partially hydrophilized nonwoven fabric, measurement pieces are cut out from regions of the nonwoven fabric having different pore arrangement patterns. At this time, the boundary line EF (see FIG. 8) of the different arrangement patterns of the openings is set to the center line that bisects the length between one arrangement pattern of the openings and the other arrangement pattern of the openings. Assuming a line EF, a measurement piece is cut out at random with an interval of 10 mm from the center line to the side of the arrangement pattern of one opening or the side of the arrangement pattern of the other opening. The center line EF is a straight line that bisects the outer edge of the first opening closest to the boundary and the outer edge of the second opening and that extends in the width direction Y. As shown in FIG.

For the second apertures 55 as well, the number of apertures per unit area is calculated in the same manner as for the hydrophilic nonwoven fabric. When calculating the number of second apertures 55 per unit area in the non-hydrophilic portion 47 of the partially hydrophilic nonwoven fabric, the non-hydrophilic nonwoven fabric in the longitudinal direction X from the boundary line (EF) of the arrangement pattern of the apertures in the partially hydrophilic nonwoven fabric. After leaving an interval of 10 mm on the hydrophilic region 45 side, a reference range B2 is assumed, and the number of the second openings 55 within the reference range B2 is counted (see FIG. 8). A symbol Q2 shown in FIG. 8 is a repeating unit for the second apertures 55 . Further, the area (w2×e2) of the reference range B2 is calculated, and the number n2 of the second apertures 55 within the reference range B2 is divided by the area of the reference range B2 to convert to the number of apertures per unit area. do. Regarding the second apertures 55, the number of apertures per unit area is calculated by the following formula (2).

The above magnitude relationship can also be achieved, for example, by making the area of the individual first apertures 50 of the hydrophilic nonwoven fabric 41 larger than the area of the individual apertures 55 of the non-hydrophilic region 45 (FIG. 7). (b) reference]. Such an aspect is also called aspect (2). In the case of aspect (2), from the viewpoint of improving breathability and sweat absorption, the area of each second opening 55 is preferably 90% of the area of each first opening 50. Below, more preferably 80% or less, more preferably 0% or more, more preferably 10% or more, more preferably 0% or more and 90% or less, more preferably 10% or more and 80% or less. From the same viewpoint as above, the area of each first opening 50 is preferably 20 mm ² or less, more preferably 15 mm ² or less, and more preferably 0.5 mm ² or more, more preferably 1 mm ² or more. It is preferably 0.5 mm ² or more and 20 mm ² or less, more preferably 1 mm ² or more and 15 mm ² or less. From the same viewpoint as above, the area of each second aperture 55 is preferably 18 mm ² or less, more preferably 12 mm ² or less, and is preferably 0.1 mm ² or more, more preferably 0.2 mm ^{2 .} more preferably 0.1 mm ² or more and 18 mm ² or less, more preferably 0.2 mm ² or more and 12 mm ² or less. The area of each aperture is obtained by randomly selecting five apertures from the measurement piece collected by the same method as the above <Method for calculating the number of apertures per unit area> and performing image analysis. An apparatus (for example, VHX-1000 manufactured by KEYENCE) is used to determine the average area per hole. Three or more measurement pieces are collected, the average value of the area per hole is obtained, and the average value is taken as the area of each individual hole.

For example, the magnitude relationship is also due to the fact that the closest distance D1 between the first openings 50 in the hydrophilic nonwoven fabric 41 is smaller than the closest distance D2 between the second openings 55 in the non-hydrophilic region 45. is achieved [see FIG. 7(a)]. Such an aspect is also called aspect (3). In the case of mode (3), from the viewpoint of improving air permeability, the closest distance D1 between the first openings 50 [see FIG. 7A] is the closest distance D2 between the second openings 55 [ 7 (a)], preferably 80% or less, more preferably 70% or less, preferably 10% or more, more preferably 20% or more, and preferably 80% or more and 10% Below, more preferably 70% or more and 20% or less. From the same viewpoint as above, the nearest distance D1 between the first openings 50 is preferably 16 mm or less, more preferably 14 mm or less, and preferably 1 mm or more, more preferably 4 mm or more. is 1 mm or more and 16 mm or less, more preferably 4 mm or more and 14 mm or less. From the same viewpoint as above, the nearest distance D2 between the second openings 55 is preferably 20 mm or less, more preferably 18 mm or less, and preferably 2 mm or more, more preferably 5 mm or more. is 2 mm or more and 20 mm or less, more preferably 5 mm or more and 18 mm or less. The closest distance between the openings is determined by randomly selecting two pairs of openings consisting of an opening and another opening closest to the opening and finding the shortest distance between the pair of openings. The average distance is measured by an image analyzer. The measurement is repeated three times, and the average value of these measurements is taken as the closest distance between the openings.

Aspects (1) to (3) described above are based on the premise that the non-woven fabric in the non-hydrophilic region 45 has the perforations 55 . These modes (1) to (3) may be combined to achieve the above magnitude relationship. For example, as shown in FIG. 7A, the aspect (1) and the aspect (3) may be combined.

The above size relationship can also be achieved by having the openings 50 only in the hydrophilic nonwoven fabric 41 . That is, the non-woven fabric in the non-hydrophilic region 45 does not have the apertures 55 . Such an aspect is also called aspect (4). In the aspect (4), when the hydrophilic nonwoven fabric 41 is a partially hydrophilic nonwoven fabric, the partially hydrophilic nonwoven fabric in the non-hydrophilic region 45 does not have openings in the non-hydrophilic portion.

In the dorsal portion B of the present embodiment, the absorbent body 23 is adjacent to the non-hydrophilic region 45 in the longitudinal direction X. As shown in FIG. In this way, when the vicinity of the absorbent body 23 is the non-hydrophilic region 45, body fluid or the like absorbed by the absorbent body 23 is prevented from leaking through the sheet in the vicinity of the absorbent body 23. FIG.

In this embodiment, the hydrophilic region 40 is positioned in a region overlapping the side seal portion S in the longitudinal direction X. As shown in FIG. Alternatively, the hydrophilic region 40 may exist in the crotch portion C as well as the waist flap portion. For example, the end portion of the hydrophilic region 40 on the crotch portion C side may extend further to the crotch portion C side than the edge of the absorbent body 23 in the longitudinal direction X. Moreover, the hydrophilic region 40 may be divided and arranged in the longitudinal direction X across the longitudinal direction X edge of the absorber 23 .

The ventral portion A may have the same configuration as the dorsal portion B, or may have a different configuration from the dorsal portion B. For example, the ventral part A has a ventral waist flap part Fa made of a plurality of non-woven fabrics outward from the end part 23A of the absorbent body 23, and the ventral waist flap part Fa is the dorsal waist flap. It may have the same configuration as the part Fb, or may have a different configuration. When the ventral portion A has the same configuration as the dorsal portion B, the description of the dorsal portion B applies to the ventral portion A as appropriate.

A plurality of waist elastic members 33 are arranged between the non-folded portion 31 b of the outer layer sheet 31 and the inner layer sheet 32 in the hydrophilic region 40 of the present embodiment. When the elastic member 33 contracts when worn, the hydrophilic nonwoven fabric 41 comes closer to the wearer's skin and absorbs more sweat. preferably. From the same viewpoint as above, the number of elastic members in the hydrophilic region 40 is preferably 2 or more and 25 or less, more preferably 3 or more and 20 or less.

The shapes of the first opening portion 50 and the second opening portion 55 are not particularly limited, and may be any shape. Examples of the shape include circular, elliptical, triangular, square, hexagonal, star-shaped, and heart-shaped.

Further explaining the diaper 1, as shown in FIG. 1 and FIG. A plurality of waist elastic members 33 are arranged intermittently at predetermined intervals in the longitudinal direction X. As shown in FIG. Since the waist elastic member 33 is arranged in such a manner that its elastic stretchability is exhibited, the opening edge of the waist opening WH has an annular waist that is substantially continuous over the entire circumference. Gathers are formed. In addition, one or a plurality of thread-like or belt-like leg elastic members 34 for forming leg gathers are arranged in a stretched state on the leg edge LS that forms the opening edge of each leg opening LH. At the opening edge of each leg opening LH, a substantially continuous annular leg gather is formed over the entire circumference. These elastic members 33 and 34 are sandwiched and fixed between the outer layer sheet 31 and the inner layer sheet 32 that constitute the exterior body 3 by a bonding means such as an adhesive.

As described above, in the diaper 1 , the outer body 3 is arranged farther from the skin of the wearer of the diaper 1 than the absorbent body 23 . In addition, the outer body 3 has elasticity in the width direction Y due to the presence of the waist elastic member 33 fixed in the width direction Y in a stretched state, and has elasticity in the same direction. is a sheet. "Elasticity" means the property of being able to stretch in a given direction and shrinking when the stretch is released.

As the material for forming the elastic members used in diapers, various known elastic materials used in absorbent articles such as disposable diapers can be used without particular limitation. Materials for forming the elastic material include, for example, synthetic rubbers such as styrene-butadiene, butadiene, isoprene and neoprene, natural rubber, EVA, elastic polyolefin, and polyurethane. As for the shape of the elastic member, it is preferable to use a thread-like (string rubber, etc.) or string-like (flat rubber, etc.) having a rectangular, square, circular, polygonal cross section, etc., or a multi-filament type thread-like one. can.

Next, second to seventh embodiments of the dorsal waist flap portion according to the present invention are shown in FIGS. 9 to 12. FIG. The second to seventh embodiments are the same as the first embodiment unless otherwise described, and the description of the dorsal waist flap portion of the first embodiment is applied as appropriate unless there is a contradiction. In FIGS. 9 to 12, the same reference numerals as those of the dorsal waist flap portion of the first embodiment are assigned to the same configurations as those of the dorsal waist flap portion of the first embodiment.

9(a), (b) and FIG. 10 show a second embodiment of the dorsal waist flap portion according to the present invention. The hydrophobic nonwoven fabric in the hydrophilic region 40 of the second embodiment has second openings 55 as will be described later. are omitted.

In the second embodiment, the back waist flap portion Fb2 has a folded portion 32a in which the inner layer sheet 32 is folded back toward the skin facing side, and a non-folded portion 32b that is not folded back. The folded portion 32a of the inner layer sheet 32 is positioned between the peripheral edge WE of the waist opening WH and the end of the absorbent body 23 in the longitudinal direction X in the longitudinal direction X, and the crotch portion C of the folded portion 32a. The side edge does not reach the edge of the absorbent body 23 .

In the second embodiment, the inner layer sheet 32 is a partially hydrophilic nonwoven fabric 42, has a hydrophilic region in the folded portion 32a, that is, a hydrophilic portion, and the region other than the hydrophilic portion is non-hydrophilic. In the back waist flap portion Fb2 of the present embodiment, as shown in FIG. 9(a), the hydrophilic region 40 is the region where the hydrophilic portion 43 of the partially hydrophilic nonwoven fabric 42 exists in the thickness direction Z of the diaper.

In the first embodiment described above, in the hydrophilic region 40, the hydrophilic nonwoven fabric was located on the side closest to the wearer's body. , a hydrophobic non-woven fabric may be arranged. Conversely, in the hydrophilic region 40, the hydrophobic nonwoven fabric may be arranged on the farther side from the wearer's body than the hydrophilic nonwoven fabric. When the hydrophilic region 40 is provided with a hydrophobic nonwoven fabric, it is preferable in that it prevents the user such as the wearer or the wearer's guardian from coming into contact with the hydrophilic nonwoven fabric after absorbing sweat. In this case, from the viewpoint of improving sweat absorption, the hydrophilic nonwoven fabric is joined to a hydrophobic nonwoven fabric arranged closer to the wearer's body or farther from the wearer's body than the hydrophilic nonwoven fabric. preferably. In the second embodiment, before the outer layer sheet 31 and the inner layer sheet 32 are folded back, the hydrophobic nonwoven fabric and the hydrophilic nonwoven fabric in the hydrophilic region 40 are embossed to form the joint 60 . As a result, the nonwoven fabrics in the hydrophilic region 40 are joined by the joining portion 60 (see FIG. 9(b)). After this joining, the outer layer sheet 31 and the inner layer sheet 32 are each folded back toward the skin facing side of the diaper 1 .

In the second embodiment, in the hydrophilic region 40, the folded portion 31a of the outer layer sheet 31 is arranged as the hydrophobic nonwoven fabric on the side closer to the wearer's body than the hydrophilic nonwoven fabric. The hydrophilic nonwoven fabric in this embodiment is the aforementioned hydrophilic portion 43 . In the second embodiment, the non-folded portion 32b of the inner layer sheet 32 is arranged as the hydrophobic nonwoven fabric on the side farther from the wearer's body than the hydrophilic nonwoven fabric in the hydrophilic region 40 .

The hydrophilic region 40 of the dorsal waist flap portion includes a hydrophobic nonwoven fabric 46, which is made up of a plurality of laminated nonwoven fabrics. From the viewpoint of improving breathability, it is preferable that the nonwoven fabric arranged closer to the wearer's body or farther from the wearer's body than the hydrophilic nonwoven fabric has a plurality of pores. In this case, when the hydrophilic nonwoven fabric is pressurized by the wearer exercising or the like during wearing, sweat absorbed by the hydrophilic nonwoven fabric may return to the wearer's skin side. From the viewpoint of suppressing such reversion, the nonwoven fabric arranged on the side closer to the wearer's body or the side farther from the wearer's body than the hydrophilic nonwoven fabric in the hydrophilic region has a unit area (10 mm It is preferable that the total area of the openings per 100 mm ² on all sides is small. Specifically, it is preferable that the hydrophobic nonwoven fabric 46 has a plurality of openings ⁵⁵ in the hydrophilic region 40. is less than or equal to the total area of the openings 50 per unit area (100 mm ² of 10 mm square) of the hydrophilic nonwoven fabric. From the same viewpoint as above, the total area of the openings 55 per unit area (100 mm ² of 10 mm square) of the hydrophobic nonwoven fabric 46 in the hydrophilic region 40 is per unit area (100 mm ² of 10 mm square) of the hydrophilic nonwoven fabric. preferably 75% or less, more preferably 65% or less, preferably 0% or more, more preferably 10% or more, and preferably 0% or more and 75% Below, more preferably 10% or more and 65% or less. From the same viewpoint as above, the total area of the openings 55 per unit area (100 mm ² of 10 mm square) of the hydrophobic nonwoven fabric 46 in the hydrophilic region 40 is preferably 40 mm ² or less, more preferably 30 mm ^{2 or} less. , preferably 0.1 mm ² or more, more preferably 3 mm ² or more, more preferably 0.1 mm ² or more and 40 mm ² or less, more preferably 3 mm ² or more and 20 mm ² or less.

The total area of the openings 55 per unit area (100 mm ² of 10 mm square) of the hydrophobic nonwoven fabric 46 in the hydrophilic region 40 is the hydrophobicity that overlaps with the hydrophilic nonwoven fabric specified in the above-mentioned <Method for measuring water absorption height>. The measurement piece of the nonwoven fabric is measured by the same method as the above-mentioned <Method for measuring the total area of pores per unit area>. The hydrophobic nonwoven fabric overlapping the hydrophilic nonwoven fabric is a hydrophobic nonwoven fabric adjacent to the skin facing side or the non-skin facing side of the hydrophilic nonwoven fabric, and either the skin facing side or the non-skin facing side is hydrophobic. It is preferable that the total area of the perforations 55 per unit area of the nonwoven fabric is within the range described above. When hydrophobic nonwoven fabrics are adjacent to the skin-facing side and the non-skin-facing side of the hydrophilic non-woven fabric, preferably one of the skin-facing side and the non-skin-facing side, more preferably both sides are hydrophobic. The total area of the openings 55 per unit area of the nonwoven fabric is within the range described above.

FIG. 10 shows the pores of each nonwoven fabric in the hydrophilic region 40 of the second embodiment. In FIG. 10, illustration of the elastic member 33 is omitted. Each hydrophobic nonwoven fabric in the hydrophilic region 40 of the second embodiment has a plurality of second apertures 55 . From the viewpoint of improving breathability, it is preferable to form openings 56 penetrating the hydrophilic nonwoven fabric 41 and the hydrophobic nonwoven fabric 46 . Such openings 56 are also called through openings 56 . As shown in FIG. 10 , the through-holes 56 penetrate through a plurality of nonwoven fabrics forming the hydrophilic region 40 , and are formed by first openings 50 a of the hydrophilic nonwoven fabric 41 and second openings of the hydrophobic nonwoven fabric 46 . It is formed by arranging the holes 55 so as to communicate with each other in the thickness direction Z of the diaper. From the viewpoint of promoting ventilation through the through holes 56, it is preferable that the plurality of holes 50a and 55 forming the through holes 56 have the same size.
The hydrophilic nonwoven fabric 41 in the second embodiment has the first openings 50a forming the through openings 56 and the first openings 50b not forming the through openings 56. The elastic nonwoven fabric 41 may have only the first apertures 50a forming the through apertures 56. As shown in FIG.

FIG. 11 shows a third embodiment of the dorsal waist flap portion according to the present invention. In this embodiment, an auxiliary sheet 4 separate from the outer layer sheet 31 and the inner layer sheet 32 is arranged between the edge of the absorbent body 23 and the peripheral edge WE of the waist opening on the back side portion B of the diaper 1. The auxiliary sheet 4 is positioned on the skin facing side of the folded portion 31 a of the outer layer sheet 31 . In the dorsal waist flap portion Fb3 of the present embodiment, the auxiliary sheet 4 is a hydrophilic nonwoven fabric that is entirely hydrophilic, and the outer layer sheet 31 and the inner layer sheet 32 overlapping with the auxiliary sheet 4 are hydrophobic nonwoven fabrics. be. That is, the area overlapping the auxiliary sheet 4 is the hydrophilic area 40 . The auxiliary sheet 4 may be a partially hydrophilic nonwoven fabric.

FIG. 12 shows a fourth embodiment of the dorsal waist flap portion according to the present invention. The hydrophilic nonwoven fabric of the hydrophilic region 40 in the back waist flap portion Fb4 of this embodiment is the hydrophilic portion 43 of the partially hydrophilic nonwoven fabric. The inner layer sheet 32 is a partially hydrophilic nonwoven fabric, and has a hydrophilic portion 43 on the end portion side in the longitudinal direction X thereof. In the present embodiment, none of the sheets 31 and 32 forming the exterior body 3 are folded back toward the skin-facing surface. Further, the diaper having the back side waist flap portion of the present embodiment has the auxiliary sheet 4 covering the end portion in the longitudinal direction X of the absorber 23 . The auxiliary sheet 4 that is in contact with the absorbent body 23 or positioned near the absorbent body 23 is preferably made of a hydrophobic nonwoven fabric.

FIG. 13 shows a fifth embodiment of the dorsal waist flap portion according to the present invention, and also shows the ventral waist flap portion. The hydrophilic nonwoven fabric of the hydrophilic region 40 in the back waist flap portion Fb5 of this embodiment is the hydrophilic portion 43 of the partially hydrophilic nonwoven fabric. Specifically, the inner layer sheet 32 is a partially hydrophilic nonwoven fabric, and has hydrophilic portions on both ends in the longitudinal direction X thereof. The inner layer sheet 32, which is a hydrophilic non-woven fabric, is not folded back on the side facing the skin. From the viewpoint of absorbing sweat in the ventral portion A as well, the ventral waist flap portion Fa5 preferably has the same structure as the dorsal waist flap portion Fb5. In this case, the ventral and dorsal waist flap portions Fa5 and Fb5 may have different configurations of the hydrophilic region 40, the first opening portion 50, the second opening portion 55, and the like.

FIG. 14 shows a sixth embodiment of the dorsal waist flap portion according to the present invention. The dorsal waist flap portion Fb6 of this embodiment has a plurality of hydrophilic regions 40 spaced apart from each other in the width direction Y. As shown in FIG. Thus, the dorsal waist flap portion may have multiple hydrophilic regions 40 . When a plurality of hydrophilic regions 40 are provided, the total length W1a in the width direction Y of the plurality of hydrophilic regions 40 is preferably within the range of the length W1 in the width direction Y of the hydrophilic region 40 described above. When the hydrophilic nonwoven fabric in the hydrophilic region 40 in this embodiment is a partially hydrophilic nonwoven fabric, the measurement piece for measuring the Klemm water absorption height of the hydrophilic portion and the non-hydrophilic portion in the nonwoven fabric is the arrangement of the apertures. Based on the pattern, it is cut out by the same method as the aforementioned <Method for calculating the number of openings per unit area>. At this time, the dimensions of the measurement piece are the dimensions described in <Method for Measuring Klemm Water Absorption Height> described above.

A hydrophilic nonwoven fabric or a hydrophobic nonwoven fabric having second apertures can be produced by perforating a raw material sheet. For the hole-forming process, a known hole-forming process for partially forming a plurality of hole portions in the raw material sheet can be used. Examples of the piercing process include a method using a cutter roll, a hot embossing roll, a pin embossing roll, and the like.

The basis weight of the raw material sheet of the hydrophilic nonwoven fabric or the hydrophobic nonwoven fabric is not particularly limited and can be adjusted as appropriate. From the viewpoint of ensuring practically sufficient strength and not being bulky, the basis weight of the raw material sheet is preferably 9 g/m ² or more and 20 g/m ² or less, more preferably 12 g/m ² or more and 18 g/m ² or less. , more preferably 15 g/m ² or more and 17 g/m ² or less.

Various nonwoven fabrics can be used as the raw material sheet, and for example, the above-described nonwoven fabric used for the sheet forming the exterior body 3 can be used.

Heat-fusible fibers can be used as the hydrophobic fibers used in the raw material sheet of the hydrophobic nonwoven fabric. Examples include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides such as nylon 6 and nylon 66; can be used alone or in combination of two or more.

Natural fibers, regenerated cellulose fibers, semi-synthetic fibers, or the like can be used as the hydrophilic fibers used in the raw material sheet of the hydrophilic nonwoven fabric. Examples of natural fibers include cotton fibers, silk fibers, pulp fibers, and lyocell fibers, which are refined cellulose fibers. Examples of regenerated cellulose fibers include regenerated fibers such as rayon fibers and cupra fibers, and examples of semi-synthetic fibers include acetate and the like. These hydrophilic non-heat-fusible fibers can be used singly or in combination of two or more.
When a hydrophilic oil agent is applied to the surface of constituent fibers of a raw material sheet (nonwoven fabric) to produce a hydrophilic nonwoven fabric, the fibers used in the raw material sheet of the hydrophilic nonwoven fabric may be the hydrophobic fibers described above.

The partially hydrophilic nonwoven fabric in the first embodiment described above is manufactured by processing a raw fabric roll in which a continuous sheet is wound into a roll. As shown in FIG. 15, the original fabric roll has a hydrophilic portion 43 extending in the continuous direction of the belt-shaped sheet and a non-hydrophilic portion 47 adjacent to the hydrophilic portion 43 . The hydrophilic portion 43 is formed with the above-described first opening portion 50, and the non-hydrophilic portion 47 is formed with the above-described second opening portion 55, or the opening portion itself is not formed. . In such a roll, the hydrophilic portion 43 and the non-hydrophilic portion 47 can be visually distinguished from each other due to the difference in the total area per unit area of the openings. can be placed in

The original fabric roll 420 shown in FIG. 15 has three hydrophilic portions 43 extending in the continuous direction of the original fabric roll 420, and along the axial direction X1 of the original fabric roll 420 orthogonal to the continuous direction, a non-hydrophilic portion 47 and hydrophilic portions 43 are arranged alternately. Alternatively, the original fabric roll may have one hydrophilic portion 43 . For example, a material roll having non-hydrophilic portions 47 at both ends in the axial direction X1 and having hydrophilic portions 43 between the non-hydrophilic portions 47 may be used.

Examples of a method of partially forming the hydrophilic portion 43 in the continuous sheet of the raw fabric roll 420 include a method of applying a hydrophilic oil to the surface of constituent fibers of the raw material sheet (nonwoven fabric) before winding. From the viewpoint of easily forming the hydrophilic portion 43 extending in the width direction Y, it is preferable to adopt a method of applying a hydrophilic oil to the surface of the constituent fibers of the nonwoven fabric along the orientation of the constituent fibers. As such a method, various known methods can be employed without particular limitation. Examples thereof include spray coating, slot coater coating, roll transfer coating, and immersion in a hydrophilic oil.

The above-mentioned hydrophilic oil agent is not particularly limited as long as it is a general hydrophilizing agent used for sanitary products. The constituent fibers coated with the hydrophilic oil are dried at a temperature sufficiently lower than the melting point of the constituent fibers (for example, 120° C. or lower), for example, by using a hot air blower dryer.
The coating amount of the hydrophilic oil is preferably 0.001 g/m ² or more, more preferably 0.01 g/m 2 or more, and more preferably 0.7 g/m ² or less, and still more preferably 0.7 g/m ² or less, in terms of solid content. It is 0.6 g/m ² or less, preferably 0.001 g/m ² or more and 0.7 g/m ² or less, more preferably 0.01 g/m ² or more and 0.6 g/m ² or less.

In the raw roll 420 having the hydrophilic portion 43 and the non-hydrophilic portion 47, a cutting line extending in the continuous direction is appropriately set, and the raw roll 420 is cut along the tangential line to obtain the hydrophilic portion 43 and the non-hydrophilic portion 47. A band-shaped sheet having a is obtained, that is, a partially hydrophilic nonwoven fabric. For example, in the embodiment shown in FIG. 15, a band-shaped sheet having a hydrophilic portion 43 and a non-hydrophilic portion 47 is obtained by cutting the raw fabric roll along cutting lines I1 and I2.
From the viewpoint of easily manufacturing the outer package 3, it is preferable to cut the hydrophilic nonwoven fabric from the raw fabric roll 420 in a state in which the continuous sheets of the other nonwoven fabric forming the back side waist flap portion are laminated.

The inner layer sheet 32 in this embodiment has a plurality of openings formed by fusion-bonding thermoplastic fibers, and has a highly hydrophilic hydrophilic region continuous along the orientation direction of the thermoplastic fibers and a hydrophilic region adjacent to the hydrophilic region. A sheet for an absorbent article is used in which the hydrophilic region and the non-hydrophilic region have different total areas of the openings per unit area. Such a sheet for absorbent articles exhibits the same effect as the original fabric roll of the present invention described above. Moreover, the sheet for absorbent articles is preferably used in a stretchable region of the absorbent article.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, in the above-described second embodiment, the inner layer sheet 32 is a partially hydrophilic nonwoven fabric, but the outer layer sheet 31 may be a partially hydrophilic nonwoven fabric. In this case, the outer layer sheet 31 preferably has a hydrophilic portion at the folded portion 31a.
Further, the waist flap portion in the above-described first embodiment has the hydrophilic region 40 in the region extending outward in the longitudinal direction X from the edge in the longitudinal direction X of the absorber 23, but the waist flap portion may have a hydrophilic region 40 in a region between each side edge in the longitudinal direction X of the absorbent body 23 and each side seal portion S.

In the diaper of the above-described embodiment, in the unfolded and stretched state, the outer body 3 is continuous over the abdomen part A, the crotch part C, and the back side part B, but the outer body 3 is located on the back side of the wearer. It may be divided into a dorsal exterior body arranged on the back side and a ventral exterior body arranged on the ventral side. In this case, the absorbent main body is bridged and fixed between the dorsal exterior body and the ventral exterior body.
The diaper of the embodiment described above is a pants-type disposable diaper. It may be an unfolded disposable diaper.

In the above-described embodiment, the elastic region has elasticity by arranging a plurality of elastic members 33 between the outer layer sheet 31 and the inner layer sheet 32. A sheet-like elastic member may be arranged. Either or both of the outer layer sheet 31 and the inner layer sheet 32 may be made of a stretchable sheet that shrinks in the width direction Y. As the elastic sheet, various known ones can be used. A stretchable nonwoven fabric manufactured by the method for manufacturing a stretchable nonwoven fabric described in JP-A-3054930 and the like can also be used.

Furthermore, the following disposable diapers are disclosed regarding embodiment mentioned above.
<1>
An abdominal part arranged on the abdomen side of the wearer, a dorsal part arranged on the dorsal part of the wearer, and a crotch part positioned between them, the abdominal part and the dorsal part A disposable diaper having an absorbent body between
Each of the dorsal portion and the ventral portion has a waist flap portion outwardly from the end portion of the absorbent body and made of a plurality of nonwoven fabrics,
At least in the dorsal portion, the waist flap portion has at least one hydrophilic region extending along the width direction and a non-hydrophilic region adjacent to the hydrophilic region,
In the hydrophilic region, one of the plurality of nonwoven fabrics is a hydrophilic nonwoven fabric,
The hydrophilic nonwoven fabric has a plurality of apertures,
The disposable diaper, wherein the total area of pores per unit area of the non-hydrophilic region is smaller than the total area of pores per unit area of the hydrophilic nonwoven fabric.

<2>
The disposable diaper according to any one of <1>, wherein the hydrophilic nonwoven fabric has a Klemm absorption height of preferably 5 mm or more, more preferably 10 mm or more, and preferably 180 mm or less.
<3>
The disposable diaper according to any one of <2> above, wherein the non-woven fabric constituting the non-hydrophilic region preferably has a Klemm absorption height of 0 mm or more, preferably 4 mm or less, and more preferably 3 mm or less. .
<4>
The diaper includes an absorbent main body including the absorbent body, and an exterior body arranged on the non-skin facing side of the absorbent main body, and in the longitudinal direction of the diaper, the abdominal portion and the dorsal portion. The side edges of each are joined together to form a pair of side seals, a waist opening through which the wearer's torso is passed, and a pair of leg openings through which the wearer's lower legs are passed. cage,
The length of the hydrophilic region in the longitudinal direction of the diaper is preferably 10% or more, more preferably 20% or more, of the length from the peripheral edge of the leg opening to the peripheral edge of the waist opening. The disposable diaper according to any one of <1> to <3> above, wherein the content is preferably 100% or less, more preferably 90% or less.
<5>
In the dorsal portion, the length in the width direction of the hydrophilic region is preferably 30% or more, more preferably 40% or more, and preferably 100% of the length in the width direction of the waist flap portion. % or less, the disposable diaper according to any one of <1> to <4>.
<6>
The total area of pores per unit area of the non-hydrophilic region is preferably 75% or less, more preferably 65% or less, relative to the total area of pores per unit area of the hydrophilic nonwoven fabric. , and preferably 0% or more, more preferably 10% or more, the disposable diaper according to any one of <1> to <5>.
<7>
The total area of pores per unit area of the hydrophilic nonwoven fabric is preferably 40 mm ² or less, more preferably 30 mm ² or less, and preferably 0.5 mm ² or more, more preferably 1 mm ² or more. The disposable diaper according to any one of <1> to <6>.
<8>
The total area of the pores per unit area of the non-hydrophilic regions is preferably 30 mm ² or less, more preferably 20 mm ² or less, and is preferably 0 mm ² or more, more preferably 0.5 mm ^{2 or} more. The disposable diaper according to any one of <1> to <7>.
<9>
The disposable diaper according to any one of <1> to <8>, wherein the hydrophilic nonwoven fabric has a partially hydrophilic region.
<10>
The disposable diaper according to any one of <9> above, wherein the hydrophilic nonwoven fabric is a hydrophilic region in a partially hydrophilic nonwoven fabric.

<11>
The diaper includes an absorbent main body including the absorbent body, and an exterior body arranged on the non-skin facing side of the absorbent main body, and in the longitudinal direction of the diaper, the abdominal portion and the dorsal portion. The side edges of each are joined together to form a pair of side seals, a waist opening through which the wearer's torso is passed, and a pair of leg openings through which the wearer's lower legs are passed. cage,
The waist flap portion includes a laminate of an outer layer sheet forming a non-skin facing surface of the disposable diaper and an inner layer sheet facing the skin facing surface of the outer layer sheet,
The inner layer sheet has a folded portion where the inner layer sheet is folded back toward the skin facing side and a non-folded portion where the inner layer sheet is not folded back,
The folded portion of the inner layer sheet is positioned between the peripheral edge of the waist opening and the longitudinal end of the absorber in the longitudinal direction, and the end of the folded portion on the crotch portion side. does not reach the end of the absorber,
In <10>, wherein the inner layer sheet is the partially hydrophilic nonwoven fabric, has a hydrophilic portion that is a hydrophilic region in the folded portion, and has a non-hydrophilic region other than the hydrophilic portion. Disposable diapers as described.
<12>
The waist flap portion includes a laminate of an outer layer sheet forming a non-skin facing surface of the disposable diaper and an inner layer sheet facing the skin facing surface of the outer layer sheet,
The disposable diaper according to <10> above, wherein the inner layer sheet is the partially hydrophilic nonwoven fabric, and has hydrophilic portions that are partially hydrophilic on both ends in the longitudinal direction.
<13>
The disposable diaper according to <12>, wherein neither the outer layer sheet nor the inner layer sheet is folded back toward the skin facing side.
<14>
The disposable diaper according to any one of <1> to <8> above, wherein the hydrophilic nonwoven fabric contains hydrophilic fibers in its entirety so that the entirety is hydrophilic.
<15>
Any one of <1> to <14>, wherein the number of openings per unit area of the hydrophilic nonwoven fabric is greater than the number of openings per unit area of the non-hydrophilic region. disposable diapers.
<16>
The number of pores per unit area of the non-hydrophilic region is preferably 90% or less, more preferably 80% or less, relative to the number of pores per unit area of the hydrophilic nonwoven fabric, The disposable diaper according to any one of <1> to <15>, which is preferably 0% or more, more preferably 10% or more.
<17>
The number of pores per unit area of the hydrophilic nonwoven fabric is 25 or less, more preferably 20 or less, and preferably 0.5 or more, more preferably 1 or more. > to <16> any one disposable diaper.
<18>
The number of openings per unit area of the non-hydrophilic region is 22.5 or less, more preferably 20 or less, and preferably 0 or more, more preferably 0.05 or more, and The disposable diaper according to any one of <1> to <17>, which preferably has 0 or more and 22.5 or less, more preferably 0.05 or more and 20 or less.
<19>
The disposable diaper according to any one of <1> to <18>, wherein the area of each opening of the hydrophilic nonwoven fabric is larger than the area of each opening of the non-hydrophilic region.
<20>
The area of each pore in the non-hydrophilic region is preferably 90% or less, more preferably 80% or less, and preferably 0% of the area of each pore in the hydrophilic nonwoven fabric. The disposable diaper according to any one of <1> to <19> above, more preferably 10% or more.

<21>
The area of the individual pores of the hydrophilic nonwoven fabric is preferably 20 mm ² or less, more preferably 15 mm ² or less, and more preferably 0.5 mm ² or more, more preferably 1 mm ² or more. > to the disposable diaper according to any one of <20>.
<22>
The area of each aperture in the non-hydrophilic region is preferably 18 mm ² or less, more preferably 12 mm ^{2 or less, and more preferably 0.1 mm 2 or} more, more preferably 0.2 mm ² or more, The disposable diaper according to any one of <1> to <21>.
<23>
The disposable diaper according to any one of <1> to <22>, wherein the closest distance between the openings in the hydrophilic nonwoven fabric is smaller than the closest distance between the openings in the non-hydrophilic region.
<24>
The closest distance between pores in the non-hydrophilic region is preferably 80% or less, more preferably 70% or less, and preferably The disposable diaper according to any one of <1> to <23> above, which is 10% or more, more preferably 20% or more.
<25>
The closest distance between the pores in the hydrophilic nonwoven fabric is preferably 16 mm or less, more preferably 14 mm or less, and preferably 1 mm or more, more preferably 4 mm or more, above <1> to <24>. Disposable diaper according to any one of.
<26>
The nearest distance between the openings in the non-hydrophilic region is preferably 20 mm or less, more preferably 18 mm or less, and is preferably 2 mm or more, more preferably 5 mm or more, above <1> to <25> Disposable diaper according to any one of.
<27>
The disposable diaper according to any one of <1> to <26> above, wherein only the hydrophilic nonwoven fabric has pores.
<28>
Any one of <1> to <27>, wherein, in the hydrophilic region, a hydrophobic nonwoven fabric is arranged on the side closer to the wearer's body or on the side farther from the wearer's body than the hydrophilic nonwoven fabric. Disposable diapers as described.
<29>
In the hydrophilic region, a hydrophobic nonwoven fabric is arranged on a side closer to the wearer's body than the hydrophilic nonwoven fabric or on a side farther from the wearer's body,
The disposable diaper according to any one of <1> to <28>, wherein the hydrophobic nonwoven fabric and the hydrophilic nonwoven fabric are bonded.
<30>
Any one of <1> to <29> above, wherein in the hydrophilic region, the folded portion of the outer layer sheet is disposed as the hydrophobic nonwoven fabric on the side closer to the wearer's body than the hydrophilic nonwoven fabric. disposable diapers.

<31>
Any one of <1> to <30> above, wherein, in the hydrophilic region, a non-folded portion of the inner layer sheet is arranged as a hydrophobic nonwoven fabric on a side farther from the wearer's body than the hydrophilic nonwoven fabric. disposable diapers.
<32>
The hydrophilic region comprises a hydrophobic nonwoven fabric,
Any one of <1> to <31> above, wherein the total area of pores per unit area of the hydrophobic nonwoven fabric is equal to or less than the total area of pores per unit area of the hydrophilic nonwoven fabric. disposable diapers.
<33>
The hydrophilic region comprises a hydrophobic nonwoven fabric,
The total area of pores per unit area of the hydrophobic nonwoven fabric in the hydrophilic region is preferably 75% or less, more preferably 65% of the total area of pores per unit area of the hydrophilic nonwoven fabric. or less, preferably 0% or more, more preferably 10% or more, the disposable diaper according to any one of <1> to <32>.
<34>
The hydrophilic region comprises a hydrophobic nonwoven fabric,
The total area of the pores per unit area of the hydrophobic nonwoven fabric in the hydrophilic region is preferably 40 mm ² or less, more preferably 30 mm ² or less, and more preferably 0.1 mm ² or more, more preferably 3 mm ^{2 .} The disposable diaper according to any one of <1> to <33> above.
<35>
In the hydrophilic region, a hydrophobic nonwoven fabric is arranged on a side closer to the wearer's body than the hydrophilic nonwoven fabric or on a side farther from the wearer's body,
The disposable diaper according to any one of <1> to <34>, wherein the openings penetrating the hydrophilic nonwoven fabric and the hydrophobic nonwoven fabric are formed.
<36>
The waist flap portion includes a laminate of an outer layer sheet forming a non-skin facing surface of the disposable diaper and an inner layer sheet facing the skin facing surface of the outer layer sheet,
An auxiliary sheet separate from the outer layer sheet and the inner layer sheet is arranged between the edge of the absorbent body and the peripheral edge of the waist opening on the back side, and the auxiliary sheet is: The disposable diaper according to any one of <1> to <35> above, wherein the folded portion of the outer layer sheet is positioned on the side facing the skin.
<37>
The disposable diaper according to <36>, wherein the auxiliary sheet is the hydrophilic nonwoven fabric.
<38>
The disposable according to any one of <1> to <37>, wherein the waist flap portion in the back portion has a plurality of the hydrophilic regions spaced apart from each other in the width direction. Diapers.

1 Disposable Diaper 2 Absorbent Body 23 Absorbent Body 3 Exterior Body 31 Outer Layer Sheet 32 Inner Layer Sheet 40 Hydrophilic Region 45 Non-hydrophilic Region 50 First Opening 55 Second Opening A Abdominal B Back C Crotch Fa Abdominal waist flap Fb Dorsal waist flap WE Peripheral edge of waist opening

Claims (9)

It has a longitudinal direction corresponding to the front-rear direction of the wearer and a width direction orthogonal to the longitudinal direction, and has a ventral portion arranged on the ventral side of the wearer and a back portion arranged on the dorsal portion of the wearer. A disposable diaper comprising side portions and a crotch portion positioned therebetween, and having an absorbent body extending between the abdominal portion and the dorsal portion,
Each of the dorsal portion and the ventral portion has a waist flap portion outwardly from the end portion of the absorbent body and made of a plurality of nonwoven fabrics,
At least in the dorsal portion, the waist flap portion has at least one hydrophilic region extending along the width direction and a non-hydrophilic region adjacent to the hydrophilic region in the longitudinal direction or the width direction. ,
In the hydrophilic region, one of the plurality of nonwoven fabrics laminated in the thickness direction is a hydrophilic nonwoven fabric,
The non-hydrophilic region is a portion where the hydrophilic nonwoven fabric does not exist in the thickness direction of the disposable diaper,
The hydrophilic nonwoven fabric has a plurality of apertures,
Any one of the non-woven fabrics constituting the non-hydrophilic region also has a plurality of apertures,
The disposable diaper, wherein the total area of pores per unit area of the non-hydrophilic region is smaller than the total area of pores per unit area of the hydrophilic nonwoven fabric. It has a partially hydrophilic nonwoven fabric that has a partially hydrophilic region in the plane direction and is arranged across the hydrophilic region and the non-hydrophilic region,
2. The disposable diaper according to claim 1, wherein said hydrophilic nonwoven fabric is formed by said hydrophilized regions in said partially hydrophilic nonwoven fabric. 2. The disposable diaper according to claim 1, wherein the hydrophilic non-woven fabric contains hydrophilic fibers in its entirety so that the entirety of the hydrophilic nonwoven fabric is hydrophilic. The disposable diaper according to any one of claims 1 to 3, wherein the number of perforations per unit area of said hydrophilic nonwoven fabric is greater than the number of perforations per unit area of said non-hydrophilic region. 5. The disposable diaper according to any one of claims 1 to 4, wherein the area of each opening of said hydrophilic nonwoven fabric is larger than the area of each opening of said non-hydrophilic region. The disposable diaper according to any one of claims 1 to 5, wherein the nearest distance between openings in said hydrophilic nonwoven fabric is smaller than the nearest distance between openings in said non-hydrophilic region. 7. The hydrophilic region according to any one of claims 1 to 6, wherein a hydrophobic nonwoven fabric is disposed on a side closer to or farther from the wearer's body than the hydrophilic nonwoven fabric. disposable diapers. The hydrophilic region comprises a hydrophobic nonwoven fabric,
The disposable according to any one of claims 1 to 7, wherein the total area of pores per unit area of said hydrophobic nonwoven fabric is less than or equal to the total area of pores per unit area of said hydrophilic nonwoven fabric. Diapers. In the hydrophilic region, a hydrophobic nonwoven fabric is arranged on a side closer to the wearer's body than the hydrophilic nonwoven fabric or on a side farther from the wearer's body,
The disposable diaper according to any one of claims 1 to 8 , wherein the openings are formed to penetrate the hydrophilic nonwoven fabric and the hydrophobic nonwoven fabric.

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