JP7547141B2 - Disposable clothing items - Google Patents

Description

The present invention relates to disposable wearing articles such as disposable diapers or sanitary napkins.

Disposable wearable articles, particularly disposable diapers, often cause the wearer's skin to become rough, in particular to develop rashes. Causes of this include physical irritation to the wearer's skin (friction, hardness, excrement) and dry skin.

To solve these problems, it has been proposed that a skin care component that is semi-solid or solid at 20°C and that partially transfers to the wearer's skin at a melting point of 35°C be applied to a liquid-permeable topsheet to improve the condition of the wearer's skin (see Patent Document 1).

It is also known to apply a hydrophilic lotion to a top sheet made of nonwoven fabric to reduce friction, etc. (see Patent Document 2). A hydrophilic lotion is preferable because it can prevent the hardness of the wax-like substance and the decrease in liquid permeability. In particular, a hydrophilic lotion containing water is preferable to prevent the skin from drying out.

However, when a hydrophilic lotion containing water was used on a top sheet made of short fiber nonwoven fabric, the effect was not as increased as expected.

JP 2003-500115 A Special Publication No. 2010-526630

Therefore, the main objective of the present invention is to improve the effect of applying a hydrophilic lotion to a top sheet.

The inventors have come to the following conclusion while studying top sheets made of nonwoven fabric containing hydrophilic lotion containing water. That is, when hydrophilic lotion containing water is applied to a top sheet made of short fiber nonwoven fabric, the hydrophilic lotion is likely to migrate to the member arranged on the back side of the top sheet after manufacture, and the hydrophilic lotion is less likely to be retained on the top sheet than expected, resulting in a less effective hydrophilic lotion than expected. The disposable wearing article described below is based on this conclusion.

<First aspect>
a topsheet including a skin contact area adapted to contact the wearer's skin;
a backing member adjacent to the back side of the topsheet,
The top sheet is a liquid-permeable nonwoven fabric containing cellulosic fibers,
The skin contact area has a lotion-containing area containing a hydrophilic lotion containing water.
A disposable wearing article characterized by:

(Action and Effect)
In the present disposable wearing article, since the top sheet contains cellulosic fibers, the hydrophilic lotion applied to the top sheet is less likely to migrate to the backing member and is more likely to remain on the top sheet. Therefore, the effects of applying a hydrophilic lotion to the top sheet, such as the feel on the skin and the moisturizing effect on the skin of the wearer, can be improved compared to the conventional method. In other words, the amount of hydrophilic lotion applied can be reduced to obtain the same effect.

<Second aspect>
The nonwoven fabric of the top sheet contains 1 to 15% by weight of cotton fiber as the cellulosic fiber.
A disposable wearing article according to a first aspect.

(Action and Effect)
The cellulosic fiber contained in the top sheet is preferably cotton from the viewpoints of pleasant feel to the skin, hydrophilic lotion retention, etc., and the content can be appropriately determined but is preferably within the range of this embodiment.

<Third aspect>
The nonwoven fabric of the top sheet has a plurality of fibrous layers integrated by intertwining,
The plurality of fiber layers includes a first layer located on a surface and a second layer located on a back side of the surface layer,
the first layer comprises the cellulosic fibers;
The second layer is made of only hydrophobic fibers.
A disposable wearing article according to the first or second aspect.

(Action and Effect)
As in the present embodiment, when the top sheet is a laminated nonwoven fabric having a plurality of fiber layers, with the first layer containing cellulosic fibers and the second layer on the reverse side containing no cellulosic fibers and composed only of hydrophobic fibers, the hydrophilic lotion held in the first layer is less likely to migrate to the second layer, and the retention of the hydrophilic lotion in the top sheet is further improved, which is preferable.

<Fourth aspect>
The hydrophilic lotion contains 70 to 90% by weight of glycerin and 10 to 30% by weight of water,
The lotion-containing region has a content of the hydrophilic lotion per unit area of 5 to 15 g/ ^m2 ;
The disposable wearing article according to any one of the first to third aspects.

(Action and Effect)
The composition of the hydrophilic lotion and the lotion content in the lotion-containing region can be determined as appropriate, but are preferably within the range of this embodiment.

<Fifth aspect>
The viscosity of the hydrophilic lotion at a temperature of 20 degrees is 150 to 400 mPa s.
The disposable wearing article according to any one of the first to fourth aspects.

(Action and Effect)
The viscosity of the hydrophilic lotion can be determined appropriately, but is preferably within the range of this embodiment.

<Sixth aspect>
The back surface of the top sheet has recesses arranged at intervals on the front surface side,
a gap is formed between an upper surface of the recessed portion and the rear member,
The lotion-containing region has a portion overlapping with the recessed portion.
A disposable wearing article according to any one of the first to fifth aspects.

(Action and Effect)
In this embodiment, depressions that are recessed into the front side are arranged at intervals on the back surface of the lotion-containing region of the top sheet, and there is a gap between the upper surfaces of these depressions and the backing member. The lotion-containing region has portions that overlap with the depressions, thereby reducing the contact area between the top sheet and the backing member, and the hydrophilic lotion applied to the top sheet is more unlikely to transfer to the backing member and is more likely to remain on the top sheet.

The present invention provides the advantage of improving the effect of applying a hydrophilic lotion to the top sheet.

FIG. 2 is a plan view showing the inner surface of the tape-type disposable diaper in an unfolded state. FIG. 2 is a plan view showing the outer surface of the tape-type disposable diaper in an unfolded state. This is a cross-sectional view of FIG. This is a cross-sectional view taken along line 7-7 of FIG. 1A is a cross-sectional view taken along line 8-8 of FIG. 1, (b) a cross-sectional view taken along line 9-9 of FIG. 1, and (c) a cross-sectional view taken along line 10-10 of FIG. FIG. 2 is a plan view showing the inner surface of the tape-type disposable diaper in an unfolded state. FIG. 2 is a plan view showing the inner surface of the tape-type disposable diaper in an unfolded state. FIG. 2 is a cross-sectional view of the top sheet and the second sheet. FIG. 2 is a cross-sectional view of the top sheet and the second sheet. 13B. FIG. 13B is a cross-sectional view showing the cross sections 1-1, 2-2, and 3-3 of FIG. FIG. 2 is a plan view of the top sheet and the second sheet. FIG. 2 is an enlarged plan view of the joining pattern of the top sheet joining portion. FIG. 2 is an enlarged plan view of the joining pattern of the top sheet joining portion. 1 is a graph showing the residual rate of glycerin in a top sheet. FIG. 2 is a plan view for explaining a test specimen.

1 to 7 show a tape-type disposable diaper as an example of a disposable wearable article. The symbol X in the figure indicates the overall width of the diaper excluding the connecting tape, and the symbol L indicates the overall length of the diaper. The dotted pattern in the cross-sectional view indicates an adhesive as a joining means for joining each component member. The hot melt adhesive can be applied by known methods such as slot application, continuous line or dotted line bead application, spiral, Z-shaped, wavy, etc. spray application, or pattern coating (transfer of hot melt adhesive using a letterpress method). Alternatively or in addition to this, at the fixing portion of the elastic member, the hot melt adhesive can be applied to the outer periphery of the elastic member to fix the elastic member to the adjacent member. As the hot melt adhesive, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, polyester-polyamide-based, and other types are available, but there are no particular limitations on the types that can be used. As a joining means for joining each component member, material welding means such as heat sealing and ultrasonic sealing can also be used.

In addition, as the nonwoven fabric in the following description, known nonwoven fabrics can be appropriately used depending on the part and purpose. The constituent fibers of the nonwoven fabric can be selected without particular limitation, for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. (including single-component fibers as well as composite fibers such as core-sheath fibers), regenerated fibers such as rayon or cupra, natural fibers such as cotton, etc., and these can also be used in combination. In order to increase the flexibility of the nonwoven fabric, it is preferable to use crimped fibers as the constituent fibers. In addition, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including those made hydrophilic by a hydrophilizing agent), hydrophobic fibers, or water-repellent fibers (including those made water-repellent by a water-repellent agent). In addition, nonwoven fabrics are generally classified into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punch nonwoven fabrics, point bond nonwoven fabrics, laminated nonwoven fabrics (SSS nonwoven fabrics in which the same or similar nonwoven fabric layers are laminated, as well as SMS nonwoven fabrics and SMMS nonwoven fabrics in which different nonwoven fabric layers are laminated, in which a meltblown layer is sandwiched between spunbond layers), etc., depending on the length of the fibers, the sheet formation method, the fiber bonding method, and the laminated structure, but any of these nonwoven fabrics can be used. A laminated nonwoven fabric means a nonwoven fabric manufactured as an integrated nonwoven fabric including all layers, and fiber bonding processing is performed across all layers, and does not include a nonwoven fabric manufactured separately and bonded together by a bonding means such as a hot melt adhesive.

This tape-type disposable diaper has a ventral portion F extending forward from the center in the front-to-rear direction LD, and a back portion B extending rearward from the center in the front-to-rear direction LD. The shape of this tape-type disposable diaper has a crotch portion M extending from the front of the center of the product in the front-to-rear direction to the rear of the center of the product in the front-to-rear direction, front wings 80 protruding on both sides at a position away from the front of the center of the product in the front-to-rear direction, and rear wings 81 protruding on both sides at a position away from the rear of the center of the product in the front-to-rear direction. Furthermore, this tape-type disposable diaper has an absorbent body 56 built into an area including the crotch portion, a liquid-permeable top sheet 30 covering the front side of the absorbent body 56, a liquid-impermeable sheet 11 covering the back side of the absorbent body 56, and an exterior nonwoven fabric 12 covering the back side of the liquid-impermeable sheet 11 and constituting the outer surface of the product.

The materials and features of each part will be explained below in order.
(Absorbent)
The absorbent body 56 is a part that absorbs and retains excreted liquid, and can be formed by a fiber assembly. As the fiber assembly, in addition to stacked staple fibers such as cotton-like pulp and synthetic fibers, a filament assembly obtained by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate as necessary can be used. The fiber weight can be, for example, about 100 to 300 g/ ^m2 when stacking cotton-like pulp or staple fibers, and can be, for example, about 30 to 120 g/ ^m2 when forming a filament assembly. The fineness of the synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex.

The planar shape of the absorbent body 56 can be appropriately determined, and can be rectangular or can be a shape in which the middle part in the front-to-back direction LD is narrowed to fit around the legs. In FIG. 1, the absorbent body 56 is included, but the absorbent article of the present invention may not include an absorbent body.

(Superabsorbent polymer particles)
The absorbent body 56 may contain superabsorbent polymer (SAP) particles in part or in whole. The superabsorbent polymer particles include "particles" as well as "powder". As the superabsorbent polymer particles, those used in this type of absorbent article may be used as they are. The particle size of the superabsorbent polymer particles is not particularly limited, but it is preferable that, for example, when sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1:2006) and sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1:2006) for the particles that fall below the sieve, the ratio of particles remaining on the 500 μm standard sieve is 30% by weight or less and the ratio of particles remaining on the 180 μm standard sieve is 60% by weight or more.

There are no particular limitations on the material that can be used for the superabsorbent polymer particles, but those with a water absorption capacity of 40 g/g or more are preferred. Superabsorbent polymer particles include starch-based, cellulose-based and synthetic polymer-based materials, and examples of materials that can be used include starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked products of sodium carboxymethylcellulose and acrylic acid (salt) polymers. The shape of the superabsorbent polymer particles is preferably the commonly used powder-like form, but other shapes can also be used.

The highly absorbent polymer particles preferably have a water absorption speed of 70 seconds or less, and particularly 40 seconds or less. If the water absorption speed is too slow, the liquid supplied to the absorbent body 56 tends to flow back out of the absorbent body 56, which is known as backflow.

The highly absorbent polymer particles preferably have a gel strength of 1000 Pa or more. This effectively prevents the sticky feeling after absorbing liquid, even when the absorbent body 56 is bulky.

The basis weight of the highly absorbent polymer particles can be appropriately determined depending on the absorption amount required for the application of the absorbent body 56. Therefore, although it cannot be generally stated, it can usually be set to 50 to 350 g/ ^m2 .

(packaging sheet)
In order to prevent the superabsorbent polymer particles from escaping or to improve the shape retention of the absorbent body 56, the absorbent body 56 can be incorporated as an absorbent element 50 wrapped in a wrapping sheet 58. As the wrapping sheet 58, tissue paper, particularly crepe paper, nonwoven fabric, polylaminated nonwoven fabric, a sheet with small holes, etc. can be used. However, it is preferable that the sheet is one from which the superabsorbent polymer particles do not escape. When using nonwoven fabric instead of crepe paper, hydrophilic SMMS (spunbond/meltblown/meltblown/spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene/polypropylene, etc. can be used as the material. The fiber basis weight is preferably 5 to 40 g/m ² , particularly 10 to 30 g/m ² .

As shown in FIG. 3, the packaging sheet 58 may be structured so that one sheet wraps the entire absorbent body 56, or multiple sheets, such as two sheets on top and two sheets on the top and bottom, may wrap the entire absorbent body 56. The packaging sheet 58 may also be omitted.

(Top sheet)
The top sheet 30 has a skin contact region that contacts the wearer's skin. The top sheet 30 in the illustrated example extends from the front end to the rear end of the product in the front-rear direction and extends laterally beyond the absorbent body 56 in the width direction WD, but can be modified as needed, for example by making the width of the top sheet 30 shorter than the overall width of the absorbent body 56, for example when the starting points of rising gathers 60 described below are located closer to the center in the width direction WD than the side edges of the absorbent body 56.

As the top sheet 30, a nonwoven fabric containing hydrophilic cellulose-based fibers (hereinafter, also referred to as a cellulose-based fiber-containing nonwoven fabric) is used. Examples of hydrophilic cellulose-based fibers include natural cellulose fibers such as cotton fibers and pulp fibers, and artificial cellulose fibers such as rayon fibers, acetate fibers, and lyocell fibers. As the cotton fibers, any cotton fibers can be used, such as raw cotton, refined and bleached cotton fibers, or cotton fibers that have been refined and bleached and then dyed, refined and bleached absorbent cotton fibers, and even defibrated yarn or fabric. However, it is particularly preferable to use defatted cotton fibers obtained by degreasing the natural oils and fats of cotton wax adhering to the surface of the cotton fibers.

The basis weight and thickness of the top sheet 30 can be determined as appropriate, but from the viewpoint of flexibility, etc., it is preferable that the basis weight is about 10 to 30 g/ ^m2 and the thickness is about 0.5 to 2.0 mm. When a nonwoven fabric containing cotton fibers is used for the top sheet 30, the content of cotton fibers in the top sheet 30 can be determined as appropriate, and can be, for example, 100% by weight (the entire top sheet 30 is made only of cotton fibers), but due to the increased cost, it is preferable to set it to about 1 to 15% by weight. Note that when other cellulose-based fibers are used instead of cotton fibers, the content can also be about 1 to 15% by weight.

The cellulosic fiber-containing nonwoven fabric may be a single-layer nonwoven fabric, but may also have multiple fiber layers integrated by intertwining. In this case, any one of the multiple fiber layers may contain cellulosic fibers, and multiple fiber layers may contain cellulosic fibers, or all fiber layers may contain cellulosic fibers.

As the fibers other than the cellulose fibers in the cellulose-based fiber-containing nonwoven fabric, one or more suitable synthetic fibers can be used. As the fibers other than the cellulose fibers, long fiber nonwoven fabrics can also be contained, but in general, short fibers with a fineness of 1 to 10 dtex and a fiber length of about 20 to 100 mm are suitable.

(middle seat)
In order to quickly transfer the liquid that has permeated the top sheet 30 to the absorbent body, a hydrophilic intermediate sheet (also called a "second sheet") 40 can be provided. This intermediate sheet 40 is intended to quickly transfer the liquid to the absorbent body, improve the absorption performance of the absorbent body, and prevent the "backflow" phenomenon of absorbed liquid from the absorbent body. The intermediate sheet 40 in this example corresponds to a backing member adjacent to the back side of the top sheet 30, but the intermediate sheet 40 can also be omitted, in which case the packaging sheet 58 becomes the backing member, and when the packaging sheet 58 is also omitted, the absorbent body 56 becomes the backing member.

As the intermediate sheet 40, a liquid-permeable sheet such as a nonwoven fabric can be used. As the intermediate sheet 40, an air-through nonwoven fabric is particularly preferred because it is bulky. For the air-through nonwoven fabric, it is preferred to use composite fibers with a core-sheath structure, and in this case, the resin used for the core may be polypropylene (PP), but polyester (PET) with high rigidity is preferred. When using such nonwoven fabrics of hydrophobic synthetic fibers, a known hydrophilizing agent can be used to make the nonwoven fabric hydrophilic. The basis weight of the nonwoven fabric is preferably 17 to 80 g/m ² , more preferably 18 to 60 g/m ^2. The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferred to use eccentric fibers with no core in the center, hollow fibers, or eccentric and hollow fibers as the mixed fibers of all or part of the raw fiber.

In the illustrated example, the intermediate sheet 40 is shorter than the width of the absorbent body 56 and is disposed in the center, but it may be disposed across the entire width. The intermediate sheet 40 may be disposed across the entire length of the diaper, or may be disposed only in the middle part in the front-to-rear direction LD, which includes the excretion position, as in the illustrated example.

(Liquid-impermeable sheet)
The liquid-impermeable sheet 11 is not particularly limited, but is preferably moisture-permeable. For example, a microporous sheet obtained by kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching the sheet in a uniaxial or biaxial direction can be suitably used as the liquid-impermeable sheet 11. In addition, a sheet having improved waterproofness using a nonwoven fabric as a base material can also be used as the liquid-impermeable sheet 11.

It is desirable for the liquid-impermeable sheet 11 to extend over the same or a wider area than the absorbent body 56 in the front-rear direction LD and width direction WD, but if necessary, for example, when other water-blocking means are present, it may be structured so that it does not cover the ends of the absorbent body 56 in the front-rear direction LD and width direction WD.

(Outer nonwoven fabric)
The exterior nonwoven fabric 12 covers the entire back side of the liquid-impermeable sheet 11, giving the outer surface of the product a cloth-like appearance. The fiber weight of the exterior nonwoven fabric 12 is preferably 10 to 50 g/m ² , and particularly 15 to 30 g/m ² , but is not limited thereto. The exterior nonwoven fabric 12 may be omitted, in which case the liquid-impermeable sheet 11 may be extended to the side edges of the product.

(Rise and gather)
In order to prevent excrement from moving laterally along the top sheet 30 and to prevent so-called lateral leakage, it is preferable that rising gathers 60 that rise towards the wearer's skin are provided on both sides in the width direction WD of the front surface. Of course, the rising gathers 60 can be omitted.

When rise-up gathers 60 are used, their structure is not particularly limited, and any known structure can be used. The rise-up gathers 60 in the illustrated example are composed of a gather sheet 62 that is substantially continuous in the width direction WD, and an elongated gather elastic member 63 that is fixed to the gather sheet 62 in a stretched state along the front-to-rear direction LD. A water-repellent nonwoven fabric can be used as the gather sheet 62, and rubber thread or the like can be used as the gather elastic member 63. As shown in Figures 1 and 2, multiple elastic members can be provided, or one elastic member can be provided.

The inner surface of the gathered sheet 62 has a joining start point in the width direction WD on the side of the top sheet 30, and the portion outward in the width direction from this joining start point is joined with a hot melt adhesive or the like to the inner surface of each side flap SF, that is, in the illustrated example, to the side of the liquid-impermeable sheet 11 and the side of the exterior nonwoven fabric 12 located outward in the width direction.

Around the legs, the widthwise center side of the joining start point of the rising gathers 60 is fixed to the top sheet 30 at both ends in the front-to-rear direction of the product, but the area between them is an unfixed free area, which rises due to the contraction force of the elastic member 63 and comes into close contact with the body surface.

(end flaps, side flaps)
The illustrated tape-type disposable diaper has a pair of end flaps EF that do not have an absorbent body 56 and extend to the front and rear sides of the absorbent body 56, respectively, and a pair of side flaps SF that do not have an absorbent body 56 and extend laterally beyond both side edges of the absorbent body 56. The side flaps SF may be made of a main body sheet (exterior nonwoven fabric 12, etc.) that continues from the portion having the absorbent body 56, as in the illustrated example, or may be formed by attaching other materials.

(Flat gathers)
A side elastic member 64 made of an elongated elastic member such as rubber thread is fixed to each side flap SF in a stretched state in the front-rear direction LD, so that the leg portion of each side flap SF is configured as a flat gather. As shown in the illustrated example, the side elastic member 64 is provided between the gather sheet 62 and the liquid-impermeable sheet 11 on the outer side in the width direction near the joining start end of the joining portion of the gather sheet 62, and can also be provided between the liquid-impermeable sheet 11 and the exterior nonwoven fabric 12 in the side flap SF. The side elastic member 64 can be provided in multiple pieces on each side as shown in the illustrated example, or only one piece on each side. Of course, the side elastic member 64 (flat gather) can be omitted.

The flat gathers are the areas where the contraction force of the side elastic members 64 acts (the areas where the side elastic members 64 are shown in the figure). Therefore, in addition to the form in which the side elastic members 64 are present only in the areas of the flat gathers, the side elastic members 64 are present on the front side, back side, or both sides of the flat gathers, but the side elastic members are cut into small pieces in one or multiple places outside the areas of the flat gathers, are not fixed to the sheets that sandwich the side elastic members 64, or both, so that the contraction force of the side elastic members 64 acts only on the areas of the flat gathers without acting on areas other than the flat gathers (essentially equivalent to no elastic members being provided).

(Front wing)
This tape-type disposable diaper has front wings 80 protruding on both the left and right sides at a position away from the center of the product in the front-to-rear direction. The front wings can be omitted (i.e., the width of the product does not change from the narrowest part to the front end of the product).

The dimension of the width direction WD of the front wing 80 can be determined as appropriate, but can be, for example, 5 to 20% (particularly 7 to 15%) of the total length L of the article. The dimension of the width direction WD of the front wing 80 can be approximately the same as the dimension of the width direction WD of the rear wing 81 described below.

(Rear wing)
This tape-type disposable diaper has rear wings 81 protruding on both the left and right sides at positions rearward away from the center of the product in the front-to-rear direction.

The width direction WD dimension of the rear wing 81 can be determined as appropriate, and can be the same as the width direction dimension of the front wing 80, or it can be smaller or larger than the width direction dimension of the front wing 80.

(Middle part)
Both side edges 15 of the product between the front wing 80 and the rear wing 81 may have a substantially straight portion passing through a range of ±5 mm in a direction perpendicular to the center, the range being centered on a direction in which the acute angle with respect to the front-to-rear direction LD is less than ±2 degrees. Both side edges 15 of the product between the front wing 80 and the rear wing 81 may be wavy or arc-shaped (not shown), or may be straight as in the illustrated example.

(Wing formation)
As shown in the illustrated example, by cutting the side of the side flap SF in a concave shape, it is possible to form an entire concave edge extending from the lower edge of the front wing 80 through both side edges 15 of the product between the front wing 80 and the rear wing 81 to the lower edge of the rear wing 81. In this case, the laminated structure of the side flap SF determines the laminated structure of the front wing 80 and the rear wing 81, and in the illustrated example, the front wing 80 and the rear wing 81 are formed by the gathered sheet 62 and the exterior nonwoven fabric 12. Although not shown, a front extension sheet protruding laterally from the side flap SF may be provided, and the entire front wing 80 or a part of the tip side may be formed by the front extension sheet. Similarly, a rear extension sheet protruding laterally from the side flap SF may be provided, and the entire rear wing 81 or a part of the tip side may be formed by the rear extension sheet. Various nonwoven fabrics can be used as the front extension sheet and the rear extension sheet.

(Connection part)
The rear wing 81 is provided with a connecting portion 13A that is detachably connected to the abdominal portion F when worn. That is, when wearing, both sides of the rear wing 81 are brought to the abdominal side of the wearer, and the connecting portion 13A of the rear wing 81 is connected to the outer surface of the abdominal portion F. The connecting portion 13A may be provided with a hook material (male material) of a mechanical fastener (hook-and-loop fastener) or may be provided with an adhesive layer. The hook material has a number of engaging protrusions on its connecting surface, and the shape of the engaging protrusions may be any known shape, such as a L shape, a J shape, a mushroom shape, a T shape, or a double J shape (a shape in which two J shapes are joined back to back).

The connecting portion 13A can be attached directly to the rear wing 81, or, as in the illustrated example, a connecting tape 13 having the connecting portion 13A can be attached to the rear wing 81. The structure of the connecting tape 13 is not particularly limited, but in the illustrated example, it has a tape attachment portion 13C fixed to the side flap SF, a tape main body portion 13B protruding from this tape attachment portion 13C, and a connecting portion 13A provided in the middle of the tape main body portion 13B in the width direction WD, with the tip side of this connecting portion 13A forming a grip portion. The sheet material forming the area from the tape attachment portion 13C to the tape main body portion 13B can be nonwoven fabric, plastic film, polylaminated nonwoven fabric, paper, or a composite material of these.

The connection points of the connecting parts 13A on the outer surface of the abdominal portion F can be appropriately determined, and may be only the main body part located between the left and right front wings 80, or may be the range from the side of the main body part to the base end side of the front wing 80. These connection points are preferably such that the connecting parts 13A can be easily connected, and a target sheet 24 having a target for facilitating connection may be provided. For example, when the connecting parts 13A are a hook material (male material) of a mechanical fastener (hook and loop fastener), the connection points on the outer surface of the abdominal portion F may be formed of a loop material (female material) of the mechanical fastener or a nonwoven fabric. As the loop material, a plastic film with loop thread sewn thereon is also known, but a long-fiber nonwoven fabric (such as a spunbond nonwoven fabric with a fineness of 2.0 to 4.0 dtex, a basis weight of 20 to 50 g/m ² , and a thickness of about 0.3 to 0.5 mm) in which the fibers are continuously oriented in the width direction WD and a welded portion is provided in which the fibers are intermittently welded to each other at least in the width direction WD, is preferable from the viewpoint of breathability and flexibility. When the region including the connecting portion on the outer surface of the abdominal portion F is formed of the exterior nonwoven fabric 12 as in the illustrated example, the hook material can be connected to the exterior nonwoven fabric 12 without adding anything. If necessary, the loop material may be attached only to the connecting portion on the outer surface of the abdominal portion F. Also, when the connecting portion 13A is an adhesive layer, a plastic film with a smooth surface that is highly adhesive can be attached to the connecting portion on the outer surface of the abdominal portion F.

(Fixing the top sheet)
The top sheet 30 is preferably bonded to a backing member arranged on the back side of the top sheet 30 via a hydrophobic hot melt adhesive 29. Alternatively, or in addition, the top sheet 30 may be joined to a backing member arranged on the back side thereof by welding at least one of the top sheet 30 and the backing member arranged on the back side thereof. The top sheet 30 fixing region may extend over the entire top sheet 30, or may be only the region in contact with the top sheet 30 other than the depression 20. In the illustrated example, the backing members are the intermediate sheet 40, the packaging sheet 58, and the liquid-impermeable sheet 11, but are not limited thereto.

Hydrophobic hot melt adhesives 29 can be made of EVA, olefin, polyester/polyamide, etc., and adhesive rubber (elastomer) types are particularly suitable.

The amount of hydrophobic hot melt adhesive 29 to be applied can be determined as appropriate, but can usually be about 0.1 to 10 g/ ^m2 . In particular, it is preferable that the amount of hydrophobic hot melt adhesive 29 to be applied is about 0.5 to ⁵ g/m2, since it can prevent the hot melt adhesive 29 from overflowing, but it is desirable to combine it with a design for the application pattern of the hydrophilic lotion, since adhesion inhibition by the hydrophilic lotion described below is likely to occur. The application pattern of the hydrophobic hot melt adhesive 29 can be determined as appropriate, and a dense pattern with minute non-applied parts scattered therein (spiral, Z-shaped, wavy, or other spray application) is preferable, but a continuous surface application pattern such as slot application may also be used.

(Lotion-containing area)
The skin contact area of the top sheet 30 has a lotion-containing area 32 containing a hydrophilic lotion containing water, as shown in Figures 6 and 7. If the dimensions of the lotion-containing area are too small, the friction reduction effect will be localized and the significance of protecting the wearer's skin will be reduced, so the lotion-containing area 32 preferably has a dimension 32L in the MD direction (front-back direction LD in the illustrated example) of 30 mm or more and a dimension 32W in the CD direction (width direction WD in the illustrated example) of 5 mm or more. The MD dimension 32L of the lotion-containing area 32 is more preferably 50 mm or more, and particularly preferably 100 mm or more. The upper limit of the MD dimension 32L of the lotion-containing area 32 is the total length L of the product, but it may be shorter than this. The CD dimension 32W of the lotion-containing area 32 is more preferably 10 mm or more. The upper limit of the CD dimension 32W of the lotion-containing area 32 is the dimension in the width direction WD of the top sheet 30, but it may be shorter than this.

The lotion-containing region 32 may be provided in one location with a relatively large area, or in multiple locations. The lotion-containing region 32 is preferably provided in vertical stripes as in the illustrated example, but may also be provided in horizontal stripes. In these cases, the distance 32X between adjacent lotion-containing regions 32 can be determined as appropriate, but is preferably, for example, about 1.5 to 10 mm.

When the top sheet 30 contains a hydrophilic lotion in this way, because the top sheet 30 is a nonwoven fabric containing cellulose-based fibers as described above, the hydrophilic lotion applied to the top sheet 30 is less likely to migrate to the backing member (such as the intermediate sheet 40 in the illustrated example) and is more likely to remain on the top sheet 30. Therefore, the effects of applying a hydrophilic lotion to the top sheet 30, such as the feel on the skin (friction reduction effect) and the moisturizing effect on the wearer's skin, can be improved compared to conventional methods.

As shown in FIG. 8, one preferred example is a top sheet 30 made of two or more fiber layers, with the first layer 30a, which is located on the surface and in contact with the skin, containing cellulosic fibers, and the second layer 30b, which is located behind the first layer 30a, being made of only hydrophobic fibers. This makes it difficult for the hydrophilic lotion held in the first layer 30a to migrate to the second layer 30b, further improving the retention of the hydrophilic lotion in the top sheet 30. In the illustrated example, there are two fiber layers, but in the case of three or more layers, the second layer 30b does not have to be the layer on the back side as long as it is located behind the first layer 30a. In addition, if there is another fiber layer between the first layer 30a and the second layer 30b, it is preferable that the other fiber layer also contains cellulosic fibers, but it is not necessary that it does not contain them.

As the fibers other than the cellulosic fibers, one or more suitable synthetic fibers can be used, and in particular in the first layer, hydrophobic synthetic fibers may be used, but synthetic fibers coated with a hydrophilizing agent are more preferable. As the fibers other than the cellulosic fibers in each layer, thin short fibers with a fineness of 1 to 3 dtex (more preferably 1.5 to 2.5 dtex) and a fiber length of 20 to 150 mm are preferable (the same applies when the top sheet 30 is a single layer nonwoven fabric), but long fibers may be used in layers that do not contain cellulosic fibers.

To ensure a good feel against the skin, it is preferable that the combination of the cellulosic fiber-containing nonwoven fabric and the hydrophilic lotion results in an average friction coefficient MIU of 0.2 to 0.4 in the lotion-containing area of the top sheet 30. In addition, although there are no particular limitations on the surface moisture content of the lotion-containing area 32, it is preferable that the surface moisture content be 3 to 10%, and particularly 4 to 8%, in order to adequately moisturize the wearer's skin and prevent it from drying out.

As long as the hydrophilic lotion contains water, the composition of the components other than water is not particularly limited. For example, the components other than water of the hydrophilic lotion can be selected from one or more of the following: glycerin, propylene glycol, dipropylene glycol, 1,3-butylene glycol, polyethylene glycol, sorbitol, xylitol, sodium pyrrolidone carboxylate, and sugars such as trehalose, mucopolysaccharides (e.g., hyaluronic acid and its derivatives, chondroitin and its derivatives, heparin and its derivatives, etc.), elastin and its derivatives, collagen and its derivatives, NMF-related substances, lactic acid, urea, higher fatty acid octyldodecyl, seaweed extract, stramonium serrata root (white and green) extract, various amino acids and their derivatives, etc. In addition, as an additive, one or more additives selected from the group consisting of emulsifiers, phosphate esters, paraffin, and surfactants can be included. As the surfactant, ether-type nonionic surfactants and nonionic surfactants including EO/PO type are preferable. To improve the shelf life of the product, the hydrophilic lotion may contain a preservative, but since the hydrophilic lotion is transferred to the skin and moisturizes the skin, it is preferable that it does not contain a preservative.

A particularly preferred hydrophilic lotion is one that contains 70 to 90% by weight of glycerin and 10 to 30% by weight of water. A hydrophilic lotion that is mainly composed of glycerin and contains an appropriate amount of water is not only preferred as a moisturizing agent when transferred to the skin, but is also preferred because the water is retained as bound water in the glycerin (glycerin has extremely high water retention), making it less likely to spoil. That is, from this perspective, when using a hydrophilic lotion that contains water, if a large amount of glycerin is contained and the surface moisture content is sufficiently secured (for example, the above-mentioned 3 to 10%), while the water activity value of the hydrophilic lotion is kept low, for example, 0.8 or less, more preferably 0.3 to 0.7, and particularly preferably 0.3 to 0.5, the proliferation of microorganisms is suppressed even without the inclusion of a preservative, the storage stability is improved, and the moisturizing effect when transferred to the skin is also high.

The content of the hydrophilic lotion in the lotion-containing region 32 may be appropriately determined depending on the purpose. As an example, in the case of a hydrophilic lotion containing 70 to 90% by weight of glycerin and 10 to 30% by weight of water, the content per unit area of the lotion-containing region 32 is preferably 5 to 15 g/m ^2. When there are multiple regions with different contents of hydrophilic lotion as shown by 32a and 32b in Fig. 9, or when the amount of hydrophilic lotion applied changes continuously, it is preferable that the content of the hydrophilic lotion in the lotion-containing region 32 as a whole is 2 to 20 g/m ² , or the portion with 5 to 15 g/m ² is 20% or more of the area of the lotion-containing region 32, or both.

The glycerin content is measured by the following glycerin content measurement method.
(Method of measuring glycerin content)
Prepare four identical products, and for one of them, measure the dimensions of the lotion-containing region 32 using the method described below, and determine the area of the lotion-containing region 32 (total area if there are multiple glycerin-containing regions).
- Cut out all of the lotion-containing areas 32 from the top sheets 30 of four of the same product (it is not necessary to cut out exactly along the edges, as long as the entire lotion-containing area 32 is included, it is acceptable to include some of the surrounding area) and use all of them as test pieces, or remove the top sheets 30 from four of the same product and use them as test pieces as they are.
The test piece is placed in a 300 ml beaker containing water at 25 degrees Celsius, and is repeatedly poked and stirred randomly with a glass rod for at least one minute, and then left to stand in the water for 60 minutes. During this standing, the test piece is folded and a weight is placed on it, or the test piece is folded in advance and fixed by gluing or sewing so that the height of the test piece in the beaker is as low as possible. The amount of water is the minimum amount (e.g., 10 ml) that allows the entire test piece to be immersed in water. After this standing, the test piece is repeatedly poked and stirred randomly with a glass rod for at least one minute, then lifted up and thoroughly squeezed, and the glycerin concentration of the glycerin-containing water remaining in the beaker is measured with a glycerin concentration meter. The weight of the glycerin-containing water remaining in the beaker is also measured. Based on these measurement results, the weight of glycerin contained in the glycerin-containing water is calculated.
The glycerin content (g/m ² ) of the lotion-containing region 32 is calculated by dividing the weight of glycerin in the glycerin-containing water by four times the area of the lotion-containing region 32 (for four products).

As fibers other than cellulose-based fibers in the top sheet 30, those using hydrophobic resin fibers are preferable because they are low cost, but if used as is, they will have poor retention of hydrophilic lotion containing water. Therefore, it is preferable for the hydrophilic lotion to have a viscosity of 150 to 400 mPa·s at a temperature of 20°C. This will preferably increase the retention of hydrophilic lotion in the top sheet 30.

For the same reason, when using hydrophobic resin fibers as fibers other than cellulosic fibers in the top sheet 30, it is preferable that the hydrophobic resin fibers are coated with a hydrophilizing agent.

As hydrophilizing agents, taking into consideration safety for the human body and safety during processing, non-ionic surfactants such as higher alcohols, higher fatty acids, and alkylphenols with added ethylene oxide, and anionic surfactants such as alkyl phosphate ester salts (octyl, dodecyl type), and alkyl sulfate salts are preferably used alone or in mixtures. The amount applied varies depending on the required performance, but it is usually about 0.1 to 2.0% by weight, and especially about 0.2 to 1.0% by weight, based on the dry weight of the target sheet. This hydrophilizing agent can also be used in the intermediate sheet.

(Recessed portion)
The front and back surfaces of the top sheet 30 may be flat without any irregularities, but as shown in Figures 9 and 10, the back surface of the top sheet 30 has depressions 20 that are recessed into the front side and are arranged at intervals, with a gap between the upper surfaces of the depressions 20 and the backing member (intermediate sheet 40 in the illustrated example), and the lotion-containing regions 32 preferably have portions that overlap with the depressions 20, because this reduces the contact area between the top sheet 30 and the backing member and makes it difficult for a hydrophilic lotion applied to the top sheet 30 to transfer to the backing member and easier for it to remain on the top sheet 30.

The depth 20h of the recess 20 can be determined as appropriate, but in order to more reliably reduce the contact area between the top sheet 30 and the backing member, it is usually preferable for it to be between 0.5 mm and 3 mm.

The dimensions of the lotion-containing region 32 and the dimensions and arrangement of the depressions 20 can be determined as appropriate, but for example, if the lotion-containing region 32 has a dimension in the front-to-rear direction LD of 30 mm or more and a dimension in the width direction WD of 5 mm or more, the depressions 20 have a dimension in the front-to-rear direction LD of 3 to 8 mm and a dimension in the width direction WD of 3 to 5 mm, and are arranged over the entire skin contact region of the top sheet 30 at intervals in the front-to-rear direction LD that are shorter than the dimension in the front-to-rear direction LD of the lotion-containing region 32 and at intervals in the width direction WD that are shorter than the dimension in the width direction WD of the lotion-containing region 32. This is preferable because even if the position of the lotion-containing region 32 changes slightly due to manufacturing errors, etc., the lotion-containing region 32 will have a portion that reliably overlaps with the depressions 20.

Furthermore, it is preferable that the dimension 20q of each depression 20 in the front-to-rear direction LD is longer than the shortest distance 20p between adjacent depressions 20 in the front-to-rear direction LD (20q > 20p) and the dimension 20w of each depression 20 in the width direction WD is longer than the shortest distance 20i between adjacent depressions 20 in the width direction WD (20w > 20i), since this makes the area ratio of the depressions 20 (the proportion of the area of the depressions 20 per unit area of the top sheet 30 ) sufficiently higher than that of the parts other than the depressions 20, thereby improving the retention of hydrophilic lotion in the top sheet 30.

The planar shape of the recess 20 is not particularly limited, and can be any shape, such as a circle as shown in the example, an ellipse, a triangle, a rectangle, a polygon with five or more sides, a star, a cloud, etc.

The planar arrangement of the recesses 20 is not particularly limited, and can be modified as appropriate, such as in a matrix as shown in FIG. 11, or in a staggered arrangement (adjacent rows are staggered) as shown in FIGS. 12 and 13.

In the illustrated example, the depressions 20 are assumed to be provided over almost the entire top sheet 30, but they can also be provided only in a portion of the top sheet 30 as long as there is an overlapping portion with the lotion-containing region 32. For example, if the dimensions of the intermediate sheet 40 are shorter than those of the top sheet 30, they can also be provided over almost the entire overlapping region of the top sheet 30 and the intermediate sheet 40.

As long as there are depressions 20 on the back surface of the top sheet 30, as shown in Fig . 9 , the surface of the top sheet 30 may be flat without unevenness. However, when the breathability and surface friction of the top sheet 30 surface are to be reduced, it is preferable that the surface of the top sheet 30 has unevenness as shown in Figs. 10 to 13. Such unevenness can be formed by embossing. In particular, as shown in the illustrated example, when the top sheet 30 is pushed from the back side to the front side by embossing to form the depressions 20, when viewed from the front side of the top sheet 30, the protrusions 31 are formed in an arrangement corresponding (overlapping) to the depressions 20 on the back surface of the top sheet 30, which is preferable because it enhances the retention of hydrophilic lotion in the protrusions 31 that tend to come into contact with the skin. When such embossing is applied to the top sheet 30, it is preferable that the top sheet 30 is a staple fiber nonwoven fabric as described above, because the depressions 20 and protrusions 31 are more clearly formed and the retention of hydrophilic lotion is improved. The reference numeral 33 denotes a portion between adjacent protrusions 31, that is, a recess when viewed from the front side.

As an example, as shown in Figures 10 to 13, it is preferable that the portions of the top sheet 30 between adjacent convex portions 31 in the width direction and the front-rear direction (portions between the depressions 20 when viewed from the back side) are joined to the intermediate sheet 40 by pressure welding to form a number of top sheet joints 82 in an intermittent joining pattern in the width direction and the front-rear direction. The top sheet joints 82 also form the bottoms of the depressions. In addition, in the joining pattern of the top sheet 30 and the intermediate sheet 40, in the region between adjacent convex portions 31 in the MD direction, a row of multiple top sheet joints 82 spaced apart in the CD direction is formed so as to cross the center position of the region in the CD direction, and in the spaced portions in the CD direction between the top sheet joints 82, the top sheet 30 and the intermediate sheet 40 are not welded, and the top sheet 30 is compressed more than both sides in the MD direction to form a compressed portion 83. Such a structure can be manufactured by the method described in Patent Document 3.

As long as the top sheet 30 is compressed in the compressed portion 83, the intermediate sheet 40 may or may not be compressed together with the top sheet 30. In addition, the portion other than the top sheet joint portion 82 and the compressed portion 83 may be compressed in the same manner as the space portion in the CD direction where the top sheet 30 and the intermediate sheet 40 are not welded, but it is preferable that the top sheet 30 and the intermediate sheet 40 are not welded and the top sheet 30 is less compressed than the space portion in the CD direction (including non-compression where it is not compressed at all). In other words, when the thickness of the top sheet joint portion 82 in the top sheet 30 is T1, the thickness of the compressed portion 83 is T2, and the thickness of the portion other than the top sheet joint portion 82 and the compressed portion 83 is T3, T1<T2=T3 may be satisfied, but it is preferable that T1<T2<T3 be satisfied.

The shape of each top sheet joint 82 is not particularly limited, and can be any shape, such as a circle as shown in the example, an ellipse, a polygon, a star, a cloud, etc.

As shown in FIG. 9(c), lotion-containing regions 32 may be provided only in the areas of the top sheet 30 that have depressions 20. In other words, a large number of lotion-containing regions 32 can be provided in correspondence with the arrangement of depressions 20. Of course, although not shown, as in the examples shown in FIGS. 10 to 13, when protrusions 31 are provided on the front surface of the top sheet 30 in correspondence with the depressions 20 on the back surface of the top sheet 30, lotion-containing regions 32 may be provided only in the areas of the top sheet 30 that have depressions 20, i.e., only in the protrusions 31.

(Test to confirm the remaining hydrophilic lotion on the top sheet)
Using three types of top sheets (a top sheet containing no cotton, a top sheet containing 5% by weight cotton, and a top sheet containing 15% by weight cotton), a required number of samples of tape-type disposable diapers (without unevenness in the top sheet 30) having the structures shown in Figures 1 to 5 and 8 were produced with the same specifications except for the top sheet 30, and the residual rate of hydrophilic lotion in the top sheet 30 was confirmed by the following method. The specifications of each component were as shown in Table 1. For each sample, hydrophilic lotion was applied to the surface of the top sheet 30 after the assembly (joining) of all the components was completed.

After applying the hydrophilic lotion to each sample, the sample was left to stand for 5 hours in an environment at 30°C, and the amount (weight) of hydrophilic lotion remaining on the top sheet was measured using the following method. The amount of glycerin remaining after the sample was left to stand for 5 hours was calculated by taking the amount applied to the top sheet (see Table 1) as 100%.

(Method for measuring remaining amount of hydrophilic lotion)
(a) The sample was fixed on a desk in an unfolded state with the top sheet 30 facing upward.
(b) A required number of oil blotting films manufactured by 3M (type that absorbs only sebum, dimensions: length 85 mm x width 55 mm, basis weight 24 g/m ² , material: porous polyolefin film) were prepared.
(c) Using a balance capable of measuring to the nearest 0.1 mg, the weight of the oil blotting film when unused was measured.
(d) The oil blotting film was grasped with a hand wearing a rubber glove and rubbed firmly (but not to the extent that the top sheet or the oil blotting film were stretched or torn) against the surface of the sample top sheet to wipe off the hydrophilic lotion contained in the top sheet. During this process, every time the rubbed area of the oil blotting film became transparent, the area where the oil blotting film was rubbed was changed to an unused area, and wiping was continued. In order to wipe evenly across the entire top sheet, the area on the top sheet that was wiped was changed as needed.
(e) When about 80% of the oil blotting film had become transparent, the weight of the used oil blotting film was measured on the scale and then it was replaced with a new film, and the above steps (c) to (e) were repeated until the weight increase rate of the last two used oil blotting films (where _{Wn is} the weight of the nth use and Wn _{-1 is the weight of the n- 1th} use) was 10% or less.
(f) When the above weight increase rate became 10% or less, the weight obtained by subtracting the total weight of all unused oil blotting films from the total weight of all used oil blotting films was regarded as the remaining amount of hydrophilic lotion.

As a result of the test, as shown in Figure 14, the glycerin residual rate was 66% in the top sheet without cotton, while it was 83% in the top sheet containing 5% cotton by weight, and 97% in the top sheet containing 15% cotton by weight, indicating that the decrease in glycerin in the top sheet is suppressed by the inclusion of cotton in the top sheet. This shows that the more cotton the top sheet contains, the more the hydrophilic lotion contained in the top sheet is retained in the top sheet even over time.

<Explanation of terms used in the specification>
As used herein, the following terms have the following meanings unless otherwise specified in the specification.

The "front-rear direction" refers to the direction indicated by the symbol LD in the figure (longitudinal direction), and the "width direction" refers to the direction indicated by the symbol WD in the figure (left-right direction), with the front-rear direction and the width direction being perpendicular to each other.

"MD direction" and "CD direction" refer to the flow direction (MD direction) in the manufacturing equipment and the horizontal direction (CD direction) perpendicular to it, and depending on the part of the product, one of them may be the front-to-back direction and the other the width direction. The MD direction of a nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. Fiber orientation is the direction in which the fibers of the nonwoven fabric run, and can be determined, for example, by a measurement method based on the fiber orientation test method using zero-distance tensile strength in TAPPI standard method T481, or a simple measurement method that determines the fiber orientation direction from the tensile strength ratio in the front-to-back direction and the width direction.

- "Front side" means the side closest to the wearer's skin when worn, and "back side" means the side farthest from the wearer's skin when worn.

- "Front" means the side closest to the wearer's skin when worn, and "back" means the side away from the wearer's skin when worn.

"Area ratio" means the proportion of the target portion in a unit area, and is expressed as a percentage by dividing the total area of the target portions (e.g., the depressions 20 ) in a target region (e.g., the top sheet 30 ) by the area of the target region. In a form in which a large number of target portions are provided at intervals, it is desirable to determine the area ratio by setting the target region to a size that includes 10 or more target portions. For example, the area ratio of holes can be measured using, for example, KEYENCE Corporation's product name VHX-1000, with measurement conditions set at 20 times, according to the following procedure.
(1) Set the lens to 20x and adjust the focus. Adjust the position of the nonwoven fabric so that the target area fits within a 4x6 area.
(2) Specify the brightness of the target area and measure the area of the hole.
(3) Click on the color extraction for "Area measurement" in "Measurement/Comment". Click on the hole area.
(4) Click "Bulk measurement", check "Show measurement results window", and save the data as a CSV file.

"Elongation rate" refers to the value when the natural length is 100%. For example, an elongation rate of 200% is equivalent to an elongation ratio of 2 times.

- "Gel strength" is measured as follows. 1.0 g of superabsorbent polymer is added to 49.0 g of artificial urine (a mixture of urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt%) and stirred with a stirrer. The resulting gel is left in a thermo-hygrostat at 40°C x 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a curd meter (I.techno Engineering: Curdmeter-MAX ME-500).

・"Basis weight" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%) until it reaches a constant weight. Pre-drying refers to bringing the sample or test piece to a constant weight in an environment at a temperature of 100°C. Note that pre-drying is not necessary for fibers with an official moisture regain of 0.0%. Using a sample collection template (100mm x 100mm), cut out a sample measuring 100mm x 100mm from the test piece that has reached a constant weight. Measure the weight of the sample and multiply it by 100 to calculate the weight per square meter, which is the basis weight.

"Thickness" is automatically measured using an automatic thickness measuring device (KES-G5 Handy Compression Measurement Program) under the conditions of a load of 0.098 N/ ^cm2 and a pressurized area of 2 ^cm2 . The thickness of a perforated nonwoven fabric is measured in the area excluding the holes and the protruding parts around them.

- Water absorption is measured according to JIS K7223-1996 "Water absorption test method for superabsorbent resins."

The water absorption rate is the "time to the end point" when 2 g of superabsorbent polymer and 50 g of saline are used to perform the JIS K7224-1996 "Test method for water absorption rate of superabsorbent polymers."

- "Expanded state" means a flat, unfolded state without contraction (including any contraction, such as contraction due to elastic members) or sagging.

- Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not the natural length.

- "Melt viscosity" is measured at a specified temperature using a Brookfield Type B viscometer (spindle No. 027) in accordance with JIS Z 8803.

The "maximum dimension" of a hole means the longer of the dimensions in the MD and CD.

"Average friction coefficient MIU" and "average friction coefficient variation deviation MMD" refer to values measured over a sensor movement distance of 20 mm using a friction tester KES-SE (10 mm square silicone sensor, load 50 g) manufactured by Kato Tech Co., Ltd. The sensor movement direction (friction direction) is the MD direction of the top sheet. When measuring a product, members other than the top sheet in the product are removed or cut to the extent that they do not affect the friction test of the top sheet surface (therefore, for example, members welded to the top sheet are not removed), and the test is performed in an unfolded state.
When the CD dimension of the lotion-containing region in the top sheet is less than the dimension of the sensor (10 mm), as shown in Figure 15(a), the top sheet 30 is cut along the side edge of the lotion-containing region 32 to create a specimen 300 (narrower in width than the sensor 100) consisting of only the lotion-containing region 32, and measurements are taken of this specimen by aligning the center of the sensor 100 with the center in the CD direction of the specimen 300 as shown in Figure 15(b). Note that after each measurement, the hydrophilic lotion adhering to the surface of the sensor 100 is thoroughly wiped off before the next measurement is performed.
In addition, when the lotion-containing region cannot be identified visually, the lotion-containing region can be identified by an appropriate method. For example, a required number of specimens (for measurement and for position identification) with the same position of the lotion-containing region 32 are prepared, the lotion-containing region 32 in the top sheet 30 of the specimen for position identification is colored in a color different from the surrounding area with an appropriate coloring agent, and the colored position is identified using a ruler or an appropriate image measuring device, and then the same position of the specimen for measurement as the colored position identified in the specimen for position identification can be used as the lotion-containing region 32 for measurement. As a material capable of coloring the hydrophilic lotion-containing region 32, the water leakage color developing agent "Moremire W" by Taseto Co., Ltd. can be suitably used. The lotion-containing region 32 can be identified by this method when measuring the dimension 32L in the MD direction and the dimension 32W in the CD direction of the lotion-containing region 32, and also when measuring the surface moisture content, which will be described later.

The "surface moisture content" is the average value calculated by measuring three arbitrary points of the lotion-containing area 32 using a moisture checker (MY-808S) manufactured by Scalar. After each measurement, any hydrophilic lotion adhering to the measurement surface of the moisture checker is thoroughly wiped off before the next measurement.

・"Water activity value" can be measured using an electrical resistance type water activity measuring device such as Freund Corporation's EZ-100ST (electrical resistance type). Calibration is performed using a saturated solution before measurement. Measurements can be performed in accordance with electrical resistance type tests based on the Food Sanitation Inspection Guidelines. That is, a sample is taken in an amount that is at least 3% of the volume of the space inside the detector of the water activity measuring device, placed on an aluminum foil dish or an open flat dish, and immediately placed in the detector and sealed, and placed under conditions of 25±2 degrees. The value is read at 10-minute intervals, and the point at which no change in the value is observed is considered to be the point at which the water vapor pressure inside the detector has reached equilibrium, and the value at that point is the measured value for that sample. Each sample is measured three times, and the average of the three measurements is the water activity value.

- "Viscosity" is measured at a specified temperature using a Brookfield Type B viscometer (spindle No. 027) in accordance with JIS Z 8803.

-If there is no description of the environmental conditions for a test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (the test location shall be a temperature of 23±1°C and a relative humidity of 50±2%).

The present invention can be used for all disposable wearable items, including pants-type disposable diapers, tape-type disposable diapers, pad-type disposable diapers, disposable swimwear, diaper covers, sanitary napkins, etc.

11...liquid-impermeable sheet, 12...exterior nonwoven fabric, 20...recessed portion, 30...top sheet, 30a...first layer, 30b...second layer, 40...middle sheet, 50...absorbent element, 56...absorbent body, 58...packaging sheet, 60...rise gathers, 62...gathered sheet, LD...front-rear direction, WD...width direction, 29...hydrophobic hot melt adhesive, 31...projections, 32...lotion-containing region.

Claims (6)

a topsheet including a skin contact area adapted to contact the wearer's skin;
a backing member adjacent to the back side of the topsheet,
The top sheet is a liquid-permeable nonwoven fabric containing cellulosic fibers,
The skin contact area has a lotion-containing area containing a hydrophilic lotion containing water,
The lotion-containing region is provided in a vertical stripe pattern,
on the back surface of the top sheet, recesses recessed toward the front side are arranged over the entire skin contact area at front-to-back intervals shorter than the front-to-back dimension of the lotion-containing area and at widthwise intervals shorter than the widthwise dimension of the lotion-containing area,
a dimension of the recess in a front-rear direction is longer than the shortest distance between adjacent recesses in the front-rear direction, and a dimension of the recess in a width direction is longer than the shortest distance between adjacent recesses in the width direction;
A gap is formed between the upper surface of the recessed portion and the rear member,
The lotion-containing region has a portion overlapping with the recessed portion.
A disposable wearing article characterized by: a topsheet including a skin contact area adapted to contact the wearer's skin;
a backing member adjacent to the back side of the topsheet,
The top sheet is a liquid-permeable nonwoven fabric containing cellulosic fibers,
The skin contact area has a lotion-containing area containing a hydrophilic lotion containing water,
The back surface of the top sheet has recesses arranged at intervals on the front surface side,
A gap is formed between the upper surface of the recessed portion and the rear member,
the lotion-containing region is provided only in the area of the top sheet having the depression,
The surface of the top sheet is free of irregularities.
A disposable wearing article characterized by: The nonwoven fabric of the top sheet has a plurality of fibrous layers integrated by intertwining,
The plurality of fiber layers includes a first layer located on a surface side and a second layer located on a back side of the first layer,
the first layer comprises the cellulosic fibers;
the second layer is made of only hydrophobic fibers,
The nonwoven fabric of the top sheet contains 1 to 15% by weight of cotton fiber as the cellulosic fiber.
The disposable wearing article according to claim 1 or 2. The hydrophilic lotion contains 70 to 90% by weight of glycerin and 10 to 30% by weight of water,
The viscosity of the hydrophilic lotion at a temperature of 20 degrees is 150 to 400 mPa s,
The lotion-containing region has a content of the hydrophilic lotion per unit area of 5 to 15 g/ ^m2 ;
The disposable wearing article according to any one of claims 1 to 3. The depressions are formed by extruding the top sheet from the back side to the front side, and protrusions corresponding to the depressions are formed on the surface of the top sheet.
The disposable wearing article according to claim 1. The surface of the top sheet is free of irregularities.
The disposable wearing article according to claim 1.

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