JP2022054088A5 - - Google Patents

Description

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

Disposable wearing articles, particularly disposable diapers, frequently pose a problem of rough skin of the wearer, particularly rash. Factors for this include physical irritation (friction, hardness, excrement) to the wearer's skin and dryness of the skin.

As a solution to this problem, a skin care composition that is semi-solid or solid at 20°C and partially migrates to the wearer's skin at a melting point of 35°C is applied to the liquid-permeable topsheet and the wearer is It has been proposed to improve the skin condition of human skin (see Patent Document 1).

It is also known to apply a hydrophilic lotion to a top sheet made of non-woven fabric in order to reduce friction (see Patent Document 2). A hydrophilic lotion is preferable in that it can prevent the hardness of the wax-like substance and decrease in liquid permeability. Hydrophilic lotions containing water are particularly preferred to prevent skin dryness.

However, when a hydrophilic lotion containing water is used for the top sheet made of short fiber nonwoven fabric, there is a problem that the effect does not increase as expected.

Japanese Patent Application Laid-Open No. 2003-500115 Japanese Patent Publication No. 2010-526630

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

The inventors of the present invention have obtained the following findings while researching a top sheet composed of a nonwoven fabric containing a hydrophilic lotion containing water. That is, when a hydrophilic lotion containing water is applied to a topsheet made of a short fiber nonwoven fabric, the hydrophilic lotion tends to migrate to the member arranged on the back side of the topsheet after production, and the topsheet is more hydrophilic than expected. Since the lotion is difficult to retain, it was thought that the effect of the hydrophilic lotion was lower than expected. The disposable wearing articles described below are based on such findings.

<First Aspect>
a topsheet including a skin-contacting area that contacts the wearer's skin;
a backside member adjacent to the backside of the topsheet;
The top sheet is a nonwoven fabric having liquid permeability and containing cellulosic fibers,
The skin contact area has a lotion-containing area containing a hydrophilic lotion containing water,
A disposable wearing article characterized by:

(Effect)
In the present disposable wearing article, since the top sheet contains cellulose fibers, the hydrophilic lotion applied to the top sheet is less likely to migrate to the back side member and easily remain on the top sheet. Therefore, the effect of adding a hydrophilic lotion to the top sheet, such as the texture and the moisturizing effect of the wearer's skin, can be improved more than before. In other words, the amount of hydrophilic lotion applied can be saved for 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 of the first aspect.

(Effect)
The cellulosic fiber contained in the top sheet is preferably cotton from the viewpoint of good touch and retention of hydrophilic lotion. and preferred.

<Third Aspect>
The nonwoven fabric of the top sheet has a plurality of fiber layers integrated by entangling,
The plurality of fiber layers includes a first layer located on the surface and a second layer located on the back side of the surface layer,
The first layer comprises the cellulosic fiber,
The second layer consists of only hydrophobic fibers,
The disposable wearing article of the first or second aspect.

(Effect)
As in this embodiment, the top sheet is a laminated nonwoven fabric having a plurality of fiber layers, the first layer contains cellulosic fibers, the second layer on the back side does not contain cellulosic fibers, and the hydrophobic When the top sheet is composed only of hydrophilic fibers, the hydrophilic lotion retained in the first layer is less likely to migrate to the second layer, and the retainability 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/m ² ,
A disposable wearing article according to any one of aspects 1 to 3.

(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 scope of this aspect.

<Fifth Aspect>
The hydrophilic lotion has a viscosity of 150 to 400 mPa s at a temperature of 20 degrees,
A disposable wearing article according to any one of aspects 1 to 4.

(Effect)
The viscosity of the hydrophilic lotion can be determined as appropriate, but is preferably within the scope of this aspect.

<Sixth Aspect>
On the back surface of the top sheet, recessed portions recessed toward the front side are arranged at intervals,
A gap is provided between the upper surface of the recessed portion and the back side member,
The lotion-containing region has a portion that overlaps the recessed portion,
A disposable wearing article according to any one of aspects 1 to 5.

(Effect)
In this aspect, on the back surface of the lotion-containing region of the top sheet, depressions that are depressed toward the front side are arranged at intervals, and a gap is formed between the upper surface of these depressions and the back member, and the lotion-containing region is , Since it has a part overlapping with the recessed part, the contact area between the top sheet and the back side member is reduced, and the hydrophilic lotion applied to the top sheet is more difficult to migrate to the back side member, remaining on the top sheet. becomes easier.

ADVANTAGE OF THE INVENTION According to this invention, the advantage of improving the effect at the time of applying a hydrophilic lotion to a top sheet is brought about.

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; FIG. 6 is a sectional view taken along line 6-6 in FIG. 1; 7 is a cross-sectional view taken along line 7-7 in FIG. 1; FIG. (a) 8-8 cross-sectional view of FIG. 1, (b) 9-9 cross-sectional view of FIG. 1, and (c) 10-10 cross-sectional view 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; It is sectional drawing of a top sheet and a second sheet. It is sectional drawing of a top sheet and a second sheet. FIG. 13B is a cross-sectional view showing 1-1 cross section, 2-2 cross section, and 3-3 cross section of FIG. 13(b). It is a top view of a top sheet and a second sheet. FIG. 4 is an enlarged plan view of the bonding pattern of the top sheet bonding portion; FIG. 4 is an enlarged plan view of the bonding pattern of the top sheet bonding portion; It is a graph of glycerin residual rate in the top sheet. It is a top view for demonstrating a specimen.

1 to 7 show a tape-type disposable diaper as an example of disposable wearing articles. Symbol X in the figure indicates the total width of the diaper excluding the connecting tape, and symbol L indicates the total length of the diaper. In addition, the dotted pattern portion in the cross-sectional view indicates an adhesive as a joining means for joining each constituent member. The hot-melt adhesive can be applied by slot coating, continuous-line or dotted-line bead coating, spiral-shaped, Z-shaped, wavy-shaped spray coating, or pattern coating (transfer of hot-melt adhesive by letterpress method). can be applied by any method. Alternatively or additionally, at the fixing portion of the elastic member, a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member. Hot-melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, and polyester-polyamide-based adhesives, and can be used without particular limitation. As a joining means for joining each constituent member, a means by material welding such as heat sealing or ultrasonic sealing can be used.

In addition, as the nonwoven fabric in the following description, a known nonwoven fabric can be appropriately used depending on the site and purpose. Constituent fibers of non-woven fabrics include, for example, synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene (including composite fibers such as core-sheath fibers in addition to single-component fibers), as well as recycled rayon and cupra. Fibers, natural fibers such as cotton, etc., can be selected without particular limitation, and these can also be mixed and used. In order to increase the softness of the nonwoven fabric, it is preferable to use crimped fibers as the constituent fibers. In addition, even if the constituent fibers of the nonwoven fabric are hydrophilic fibers (including those made hydrophilic by a hydrophilic 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 bonded (air-through) nonwoven fabrics, and needle punched nonwoven fabrics, depending on the fiber length, sheet forming method, fiber bonding method, and laminate structure. Non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (including SSS non-woven fabrics in which the same or similar non-woven fabric layers are laminated, SMS non-woven fabrics in which different non-woven fabric layers are laminated, in which a meltblown layer is sandwiched between spunbond layers, SMMS non-woven fabrics, etc.), etc. However, any of these nonwoven fabrics can be used. Laminated nonwoven fabrics are manufactured as a single nonwoven fabric containing all layers, and all layers have undergone a fiber bonding process, and multiple nonwoven fabrics manufactured separately are pasted together by a joining means such as a hot-melt adhesive. Does not include matching items.

This tape-type disposable diaper has an abdominal portion F extending forward from the center in the front-rear direction LD and a back portion B extending rearward from the center in the front-rear direction LD. In addition, the tape-type disposable diaper has a crotch portion M extending from the front side of the center in the front-rear direction of the product to the rear side of the center in the front-rear direction of the product, and a crotch portion M extending forward from the center in the front-rear direction of the product. It has a front wing 80 protruding to both left and right sides at a position, and a rear wing 81 protruding to both left and right sides at a position spaced rearward from the center of the product in the front-rear direction. Further, the present tape-type disposable diaper includes an absorbent body 56 built in a region including the crotch portion, a liquid-permeable top sheet 30 covering the front side of the absorbent body 56, and a liquid-impermeable top sheet 30 covering the back side of the absorbent body 56. It has a sheet 11 and an exterior nonwoven fabric 12 that covers the back side of the liquid-impermeable sheet 11 and constitutes the outer surface of the product.

The materials and characteristic parts of each part will be described in order below.
(Absorber)
The absorbent body 56 is a part that absorbs and retains the excreted fluid, and can be formed by an assembly of fibers. The filament assembly may be a filament assembly obtained by laminating short fibers such as cotton pulp or synthetic fibers, or by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate as necessary. can also be used. The fiber basis weight can be, for example, about 100 to 300 g/m ² when piling up cotton pulp or short fibers, and for example, about 30 to 120 g/m ² for filament aggregates. can be done. The fineness of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, more preferably 1 to 5 dtex.

The planar shape of the absorbent body 56 can be determined as appropriate, and in addition to being rectangular, the middle in the front-rear direction LD can also be shaped so as to be constricted along the circumference of the leg. Although FIG. 1 has an absorbent body 56, the absorbent article of the present invention may not have an absorbent body.

(superabsorbent polymer particles)
Absorbent body 56 may contain superabsorbent polymer (SAP) particles in part or in whole. Superabsorbent polymer particles include "powder" in addition to "particles". As the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are. Although the particle size of the superabsorbent polymer particles is not particularly limited, for example, sieving using a 500 μm standard sieve (JIS Z8801-1: 2006) (shaking for 5 minutes), and particles falling under the sieve in this sieving When sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006), the percentage of particles remaining on the 500 μm standard sieve is 30% by weight or less, and the 180 μm standard sieve It is desirable that the proportion of particles remaining on the top is 60% by weight or more.

Materials for the superabsorbent polymer particles may be used without any particular limitation, but those having a water absorption of 40 g/g or more are suitable. Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles. and acrylic acid (salt) polymers can be used. As for the shape of the superabsorbent polymer particles, the powder particles that are commonly used are suitable, but other shapes can also be used.

As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too slow, the liquid supplied into the absorbent body 56 tends to return to the outside of the absorbent body 56, which is called reversion.

As the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the absorbent body 56 is bulky, it is possible to effectively suppress the feeling of stickiness after liquid absorption.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorbent body 56 . Therefore, although it cannot be generalized, it can be usually 50 to 350 g/m ² .

(packaging sheet)
In order to prevent the superabsorbent polymer particles from slipping out or to improve the shape retention of the absorbent body 56, the absorbent body 56 can be incorporated as an absorbent element 50 wrapped with a wrapping sheet 58. FIG. As the wrapping sheet 58, tissue paper, especially crepe paper, nonwoven fabric, poly-laminated nonwoven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the sheet is such that the superabsorbent polymer particles do not escape. When non-woven fabric is used 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 have a structure that wraps the entire absorber 56 with one sheet, or may wrap the entire absorber 56 with a plurality of sheets, such as two upper and lower sheets. The packaging sheet 58 can also be omitted.

(top sheet)
The topsheet 30 has a skin contact area that contacts the wearer's skin. The illustrated top sheet 30 extends from the front end to the rear end of the product in the front-rear direction, and extends laterally from the absorber 56 in the width direction WD. If necessary, such as when the top sheet 30 is located on the center side in the width direction WD from the edges, the width of the top sheet 30 may be made shorter than the full width of the absorbent body 56, and other suitable modifications may be made.

As the top sheet 30, a nonwoven fabric containing hydrophilic cellulosic fibers (hereinafter also referred to as nonwoven fabric containing cellulosic fibers) is used. Hydrophilic cellulosic fibers include naturally derived ones such as cotton fibers (cotton fibers) and pulp fibers, and artificial cellulosic fibers such as rayon fibers, acetate fibers, and lyocell fibers. Cotton fibers include raw cotton, refined/bleached cotton fibers, refined/bleached cotton fibers that have been dyed, refined/bleached absorbent cotton fibers, and unfibered yarns or fabrics. Although any cotton fiber can be used, it is particularly preferable to use degreased cotton fiber obtained by degreasing the natural oils and fats of cotton wax adhering to the surface of the cotton fiber.

The basis weight and thickness of the top sheet 30 can be appropriately determined, but from the viewpoint of flexibility, etc., the basis weight is preferably about 10 to 30 g/m ² and the thickness is about 0.5 to 2.0 mm. When a non-woven fabric containing cotton fibers is used for the top sheet 30, the content of the cotton fibers in the top sheet 30 can be appropriately determined, for example, 100% by weight (the entire top sheet 30 is made of only cotton fibers). , it is preferable to set it to about 1 to 15% by weight because the cost increases. When other cellulosic fibers are included instead of cotton fibers, the content thereof can be about 1 to 15% by weight.

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

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

(intermediate sheet)
A hydrophilic intermediate sheet (also called a “second sheet”) 40 can be provided in order to quickly transfer the liquid permeating the top sheet 30 to the absorbent body. The intermediate sheet 40 is intended to quickly transfer the liquid to the absorbent body to enhance the absorption performance of the absorbent body, and to prevent the "return" phenomenon of the absorbed liquid from the absorbent body. The intermediate sheet 40 in this example corresponds to the back side member adjacent to the back side of the top sheet 30, but the intermediate sheet 40 can be omitted. When 58 is also omitted, the absorbent 56 becomes the back side 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 preferable because it is bulky. Composite fibers having a core-sheath structure are preferably used for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. When using such a nonwoven fabric of hydrophobic synthetic fibers, it can be made a hydrophilic nonwoven fabric by using a known hydrophilizing agent. The basis weight of the nonwoven fabric is preferably 17-80 g/m ² , more preferably 18-60 g/m ² . The thickness of the raw fibers of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the non-woven fabric bulky, it is also preferable to use eccentric fibers, hollow fibers, or eccentric and hollow fibers whose core is not in the center as mixed fibers of all or part of the raw material fibers.

The intermediate sheet 40 in the illustrated example is shorter than the width of the absorbent body 56 and arranged in the center, but it may be provided over the entire width. Further, the intermediate sheet 40 may be provided over the entire length of the diaper, or may be provided only at an intermediate portion in the front-rear direction LD including the excretion position as shown in the figure.

(liquid-impermeable sheet)
The liquid-impermeable sheet 11 is not particularly limited, but preferably has moisture permeability. As the liquid-impermeable sheet 11, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, the sheet is molded, and then the sheet is stretched in a uniaxial or biaxial direction. A sheet can be preferably used. Moreover, as the liquid-impermeable sheet 11, a non-woven fabric as a base material with improved waterproofness can also be used.

It is desirable that the liquid-impermeable sheet 11 extends in the same or wider range than the absorbent body 56 in the front-rear direction LD and the width direction WD. A structure in which the end portions of the absorber 56 are not covered in the front-rear direction LD and the width direction WD may also be employed.

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

(Getting up gathers)
On both sides of the top sheet 30 in the width direction WD, rise gathers 60 standing up toward the wearer's skin are provided in order to prevent excrement from moving laterally along the top sheet 30 and prevent so-called side leakage. preferably. Of course, the rising gathers 60 can be omitted.

When adopting the rising gathers 60, the structure is not particularly limited, and any known structure can be adopted. The illustrated rising gathers 60 are composed of a gathering sheet 62 substantially continuous in the width direction WD, and an elongated gathering elastic member 63 fixed to the gathering sheet 62 in a stretched state along the front-rear direction LD. ing. As the gather sheet 62, a water-repellent nonwoven fabric can be used, and as the gather elastic member 63, thread rubber or the like can be used. The elastic member may be provided in a plurality of pieces as shown in FIGS. 1 and 2, or may be provided in a single piece.

The inner surface of the gather sheet 62 has a joining edge in the width direction WD on the side of the top sheet 30, and the portion outside the joining edge in the width direction is the inner surface of each side flap SF, i.e., liquid-impermeable in the illustrated example. The outer nonwoven fabric 12 is bonded to the side portion of the adhesive sheet 11 and the side portion of the exterior nonwoven fabric 12 located outside in the width direction thereof with a hot-melt adhesive or the like.

Around the legs, the central side in the width direction from the joining start end of the rising gathers 60 is fixed on the top sheet 30 at both ends in the front-rear direction of the product, but the portion in between is a non-fixed free portion. The portion rises due to the contractile force of the elastic member 63 and comes to adhere to the body surface.

(end flap, side flap)
The tape-type disposable diaper of the illustrated example has a pair of end flaps EF having no absorbent body 56 extending to the front side and the rear side of the absorbent body 56 respectively, and a pair of end flaps EF not having the absorbent body 56 extending laterally from both side edges of the absorbent body 56, respectively. It has a pair of extended side flaps SF that do not have an absorbent body 56 . The side flaps SF may consist of a body sheet (outer nonwoven fabric 12 or the like) continuing from the portion having the absorber 56 as shown in the figure, or may be formed by attaching other materials.

(flat gather)
A side elastic member 64 made of an elongated elastic member such as rubber thread is fixed to each side flap SF while being stretched in the front-rear direction LD. Configured as a gather. The side elastic member 64 is provided between the gather sheet 62 and the liquid-impermeable sheet 11 at the outer side in the width direction near the joining start end of the joining portion of the gather sheet 62, as shown in the illustrated example, and the side flap SF It can also be provided between the liquid-impermeable sheet 11 and the exterior nonwoven fabric 12 in . A plurality of side elastic members 64 may be provided on each side as in the illustrated example, or only one may be provided on each side. Of course, the side elastic members 64 (planar gathers) can be omitted.

The planar gathers are portions on which the contractile force of the side elastic members 64 acts (portions where the side elastic members 64 are illustrated in the drawing). Therefore, in addition to the form in which the side elastic members 64 are present only in the planar gathers, the side elastic members 64 are present on the front side, the rear side, or both sides of the planar gathers, but the side elastic members 64 are present in areas other than the planar gathers. If the member is finely cut at one point or multiple points, or is not fixed to the sheet sandwiching the side elastic member 64, or both, the contractile force will not act on the part other than the planar gather. Also included is a structure in which the contractile force of the side elastic members 64 acts only on the plane gathers instead (substantially equivalent to not providing an elastic member).

(front wing)
This tape-type disposable diaper has front wings 80 projecting to both the left and right sides at positions spaced forward from the center of the product in the front-rear direction. The front wing can be omitted (ie, shaped to have a constant width from the narrowest part of the product to the front edge of the product).

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

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

The dimension of the rear wing 81 in the width direction WD can be determined as appropriate, and in addition to being the same as the width dimension of the front wing 80 , it can also be smaller or larger than the width 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 are, for example, centered on a direction in which the acute side crossing angle with respect to the front-rear direction LD is less than ±2 degrees, and ±5 mm in a direction orthogonal to the center. can have a substantially linear portion through a range of widths of Both side edges 15 of the product between the front wing 80 and the rear wing 81 may be wavy, arcuate (not shown) or straight as shown.

(Formation of wings)
As shown, by concavely cutting the sides of the side flaps SF, 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 rear wing. The entire recessed edge down to the lower edge of 81 can be formed. In this case, the laminated structure of the front wing 80 and the rear wing 81 is determined by the laminated structure of the side flaps SF. Although not shown, a front extension sheet projecting laterally from the side flaps SF may be provided, and the front extension sheet may form the entire front wing 80 or a portion of the front end side thereof. Similarly, a rear extension sheet projecting laterally from the side flaps SF may be provided, and the rear wing 81 may be entirely or partially formed from the rear extension sheet. Various nonwoven fabrics can be used as the front extension sheet and the rear extension sheet.

(Connecting part)
The rear wing 81 is provided with a connecting portion 13A detachably connected to the ventral portion F when worn. That is, when wearing, both sides of the rear wing 81 are brought to the abdomen of the wearer, and the connecting portion 13A of the rear wing 81 is connected to the outer surface of the abdomen portion F. As shown in FIG. As the connection portion 13A, a hook member (male member) of a mechanical fastener (surface fastener) may be provided, or an adhesive layer may be provided. The hook material has a large number of engaging projections on its connection surface, and the shape of the engaging projections may be L-shaped, J-shaped, mushroom-shaped, T-shaped, double J-shaped (J-shaped). Any shape known in the art can be adopted, such as a shape in which the two are joined back-to-back.

The connecting portion 13A can be directly attached to the rear wing 81, or the connecting tape 13 having the connecting portion 13A can be attached to the rear wing 81 as shown in the drawing. Although the structure of the connecting tape 13 is not particularly limited, in the illustrated example, a tape mounting portion 13C fixed to the side flap SF, a tape body portion 13B projecting from the tape mounting portion 13C, and a width direction of the tape body portion 13B A connecting portion 13A is provided in the middle portion of the WD, and the tip side of the connecting portion 13A serves as a knob. Nonwoven fabric, plastic film, poly-laminated nonwoven fabric, paper, or a composite material thereof can be used as the sheet material forming the tape attachment portion 13C to the tape body portion 13B.

The connection point of the connection portion 13A on the outer surface of the ventral portion F can be determined as appropriate, and the connection point may be only the main body portion located between the left and right front wings 80, or the connection point may be the main body portion. A range from the side portion to the base end side of the front wing 80 may be used as the connecting point. It is preferable that these connection portions facilitate connection of the connection portion 13A, and a target sheet 24 having a target for facilitating connection may be provided. For example, when the connecting portion 13A is a hook material (male material) of a mechanical fastener (hook-and-loop fastener), the connecting portion on the outer surface of the ventral portion F may be formed of a loop material (female material) of the mechanical fastener or a non-woven fabric. As a loop material, there is also known a material in which a loop thread is sewn on a plastic film. ^2. A spunbond nonwoven fabric having a thickness of about 0.3 to 0.5 mm, etc.) is preferably provided with welded portions in which fibers are intermittently welded at least in the width direction WD from the viewpoint of air permeability and flexibility. When the region including the connection points on the outer surface of the ventral portion F is formed of the outer nonwoven fabric 12 as in the illustrated example, the hook material can be connected to the outer nonwoven fabric 12 without adding anything. If desired, the loop material may be attached only to the connection points on the outer surface of the ventral portion F. Further, when the connecting portion 13A is an adhesive layer, a plastic film with a smooth surface that is rich in adhesiveness can be attached to the connecting portion on the outer surface of the ventral portion F. As shown in FIG.

(fixing the top sheet)
The topsheet 30 is preferably adhered via a hydrophobic hot-melt adhesive 29 to a backing member arranged on the backside of the topsheet 30 . Alternatively, or together with this, the top sheet 30 may be joined to the back member arranged on the back side by welding at least one of the top sheet 30 and the back member arranged on the back side. The area where the top sheet 30 is fixed may extend over the entire top sheet 30 or may be only the area that contacts the top sheet 30 other than the depressions 20 . In the illustrated example, the members on the back side are the intermediate sheet 40, the packaging sheet 58, and the liquid-impermeable sheet 11, but are not limited to these.

As the hydrophobic hot-melt adhesive 29, EVA-based, olefin-based, polyester-polyamide-based, etc. can be used, and adhesive rubber-based (elastomer-based) can be particularly preferably used.

The amount of the hydrophobic hot-melt adhesive 29 to be applied can be determined as appropriate, but in general, it can be about 0.1 to 10 g/m ² . In particular, when the coating amount of the hydrophobic hot-melt adhesive 29 is about 0.5 to 5 g/m ² , it is preferable because the hot-melt adhesive 29 can be prevented from squeezing out. It is desirable to combine it with the application pattern of the hydrophilic lotion. The application pattern of the hydrophobic hot-melt adhesive 29 can be determined as appropriate, and a dense pattern (spray application in a spiral, Z-shape, wave shape, etc.) in which minute non-application portions are scattered is preferable. It may be a continuous planar coating pattern such as.

(Lotion-containing area)
The skin-contacting area of the topsheet 30 has a lotion-containing area 32 containing a water-containing hydrophilic lotion, as shown in FIGS. If the dimensions of the lotion-containing region are too small, the friction reducing effect will be localized, and there will be little significance in protecting the wearer's skin. It preferably has a dimension 32L in the direction LD) and a dimension 32W in the CD direction (the width direction WD in the illustrated example) of 5 mm or more. The dimension 32L of the lotion-containing region 32 in the MD direction is more preferably 50 mm or more, and particularly preferably 100 mm or more. The upper limit of the dimension 32L in the MD direction of the lotion-containing region 32 is the total length L of the product, but it may be shorter than this. The dimension 32W in the CD direction of the lotion-containing region 32 is more preferably 10 mm or more. The upper limit of the dimension 32W in the CD direction of the lotion-containing region 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 place with a relatively large area, or may be provided in a plurality of places. The lotion-containing regions 32 are preferably provided in vertical stripes as in the illustrated example, but they may be provided in horizontal stripes. In these cases, the interval 32X between adjacent lotion-containing regions 32 can be determined as appropriate, but is preferably about 1.5 to 10 mm, for example.

When the hydrophilic lotion is contained in the top sheet 30 in this way, the hydrophilic lotion imparted to the top sheet 30 is absorbed by the back side member (in the illustrated example, It is less likely to migrate to the intermediate sheet 40 or the like) and more likely to remain on the top sheet 30. Therefore, the effect of applying a hydrophilic lotion to the top sheet 30, such as the touch (friction reducing effect) and the moisturizing effect of the wearer's skin, can be improved more than before.

In one preferred example, as shown in FIG. 8, the top sheet 30 is composed of two or more fiber layers, and the first layer 30a located on the surface and in contact with the skin contains cellulosic fibers. The second layer 30b located on the back side of the layer 30a is composed only of hydrophobic fibers. This makes it difficult for the hydrophilic lotion retained in the first layer 30a to migrate to the second layer 30b, and the retention of the hydrophilic lotion in the top sheet 30 is further improved. In the illustrated example, the number of fiber layers is two, but in the case of three or more layers, the second layer 30b does not have to be the backmost layer as long as it is located on the back side of the first layer 30a. Moreover, when another fiber layer is provided between the first layer 30a and the second layer 30b, it is preferable that the other fiber layer also contains the cellulosic fiber, but it does not have to be contained.

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

In order to make the skin feel good, the average friction coefficient MIU of the lotion-containing region of the top sheet 30 is 0.2 to 0.4 due to the combination of the cellulose-based fiber-containing nonwoven fabric and the hydrophilic lotion. is preferred. In addition, the surface moisture content of the lotion-containing region 32 is not particularly limited, but when it is 3 to 10%, particularly 4 to 8%, the wearer's skin can be moderately moistened and dryness can be prevented. Therefore, it is preferable.

As long as the hydrophilic lotion contains water, the composition of ingredients other than water is not particularly limited. For example, components of hydrophilic lotions other than water include glycerin, propylene glycol, dipropylene glycol, 1,3-butylene glycol, polyethylene glycol, sorbitol, xylitol, sodium pyrrolidone carboxylate, sugars such as trehalose, and 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, silane root One or more of (white and) extracts, various amino acids and derivatives thereof can be selected. Moreover, as additives, one or more additives selected from the group consisting of emulsifiers, phosphate esters, paraffins and surfactants can be included. As the surfactant, ether type nonionic surfactants and nonionic surfactants including EO/PO type are preferred. Hydrophilic lotions may contain preservatives in order to improve the shelf life of the product, but since hydrophilic lotions are transferred to the skin to moisturize the skin, it is desirable not to contain preservatives. .

Particularly preferred hydrophilic lotions are those containing 70-90% by weight glycerin and 10-30% by weight water. In this way, a hydrophilic lotion containing glycerin as a main component and containing an appropriate amount of water is not only preferable as a moisturizing agent when transferred to the skin, but also retains water as bound water in glycerin (glycerin has a high water retention capacity). very expensive) and less perishable. That is, from such a point of view, when using a hydrophilic lotion containing water, a large amount of glycerin is contained to ensure a sufficient surface moisture content (for example, 3 to 10% as described above), while the moisture content of the hydrophilic lotion When the activity value is low, for example, 0.8 or less, more preferably 0.3 to 0.7, and particularly preferably 0.3 to 0.5, the growth of microorganisms is suppressed without containing preservatives, The storability is improved, and the moisturizing effect is also enhanced when transferred to the skin.

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

In addition, content of glycerin is measured by the following glycerin content measuring methods.
(Method for measuring glycerin content)
- Prepare four sheets of the same product, and measure the dimensions of the lotion-containing region 32 for any one of them by the method described later. ).
Cut out all the lotion-containing areas 32 from the topsheet 30 for four identical products (it is not necessary to cut them exactly along the edges, as long as they include the entire lotion-containing area 32, including some surrounding areas) (Also possible) All of them are used as test pieces, or four top sheets 30 of the same product are removed and used as test pieces.
・Place the test piece in a 300 ml beaker filled with water at a temperature of 25°C, poke it irregularly with a glass rod and stir repeatedly for 1 minute or more, and then leave it standing while immersed in water for 60 minutes. At the time of standing, the test piece is folded and a weight is placed thereon so that the height of the test piece in the beaker is as low as possible, or the test piece is pre-folded and fixed by adhesion or sewing. Also, the amount of water is the minimum amount (for example, 10 ml) that allows the entire test piece to be immersed in water. After this standing, repeat irregular poking with a glass rod and stirring for 1 minute or more, lift the test piece and squeeze it sufficiently, and measure the glycerin concentration of the glycerin-containing water remaining in the beaker with a glycerin densitometer. Measure. Also, the weight of the glycerin-containing water remaining in the beaker is measured. Then, based on these measurement results, the weight of glycerin contained in the glycerin-containing water is obtained.
・ Calculate the glycerin content (g/m ² ) of the lotion-containing region 32 by dividing the glycerin weight of the glycerin-containing water by the value obtained by multiplying the area of the lotion-containing region 32 by 4 (for 4 products) do.

As the fibers other than the cellulosic fibers in the top sheet 30, hydrophobic resin fibers are preferable because they are low in cost. Therefore, the hydrophilic lotion preferably has a viscosity of 150 to 400 mPa·s at a temperature of 20°C. Thereby, it is preferable that the retention of the hydrophilic lotion in the top sheet 30 is enhanced.

For the same reason, when hydrophobic resin fibers are used as fibers other than cellulosic fibers in the top sheet 30, the hydrophobic resin fibers are preferably coated with a hydrophilizing agent.

Hydrophilizing agents include higher alcohols, higher fatty acids, nonionic surfactants added with ethylene oxide such as alkylphenols, and alkyl phosphate salts (octyl , dodecyl), alkyl sulfates, and other anionic surfactants are preferably used alone or in mixtures. About 2.0% by weight, preferably about 0.2 to 1.0% by weight. This hydrophilizing agent can also be used in the intermediate sheet.

(Hollow part)
The front and back surfaces of the top sheet 30 may be flat without irregularities, but as shown in FIGS. When the lotion-containing region 32 has a portion overlapping with the recessed portion 20, the space between the upper surface of the recessed portion 20 and the back side member (the intermediate sheet 40 in the illustrated example) is arranged with a space between them. This is preferable because the contact area between the top sheet 30 and the back side member is reduced, and the hydrophilic lotion applied to the top sheet 30 is less likely to migrate to the back side member and easily remain on the top sheet 30 .

The depth 20h of the recessed portion 20 can be determined as appropriate, but from the viewpoint of more reliably reducing the contact area between the top sheet 30 and the back side member, it is usually preferably 0.5 mm to 3 mm.

The dimensions of the lotion-containing region 32 and the dimensions and arrangement of the recesses 20 can be determined as appropriate. , the recessed portion 20 has a dimension 20q in the front-rear direction LD of 3 to 8 mm and a dimension 20w in the width direction WD of 3-5 mm, and the distance in the front-rear direction LD is shorter than the dimension in the front-rear direction LD of the lotion-containing region 32. , and at intervals in the width direction WD shorter than the dimensions in the width direction WD of the lotion-containing regions 32, if the lotion-containing regions 32 are arranged over the entire skin-contacting region of the top sheet 30, the position of the lotion-containing regions 32 may change slightly due to manufacturing errors or the like. Even so, the lotion-containing region 32 certainly has a portion overlapping the recessed portion 20, which is preferable.

Further, the dimension 20q in the front-rear direction LD of the recessed portion 20 is longer than the shortest interval 20p between the recessed portions 20 adjacent in the front-rear direction LD (20q>20p), and the dimension 20w in the width direction WD of the recessed portion 20 is the width direction WD. If the shortest interval 20i between the adjacent recesses 20 is longer than the shortest distance 20i (20w>20i), the area ratio of the recesses 20 (the ratio of the area of the recesses 20 per unit area of the top sheet 30 ) is greater than the area other than the recesses 20 , and the retention of the hydrophilic lotion in the top sheet 30 becomes even more excellent, which is preferable.

The planar shape of the recessed portion 20 is not particularly limited, and in addition to the circular shape shown in the figure, it may be any shape such as an ellipse, a triangle, a rectangle, a polygon with five or more angles, a star, or a cloud. can.

The planar arrangement of the recesses 20 is not particularly limited, and may be arranged in a matrix as shown in FIG. 11, or arranged in a zigzag arrangement (arranged alternately in adjacent rows) as shown in FIGS. 12 and 13. , can be changed as appropriate.

In the illustrated example, it is assumed that the recessed portion 20 is provided over substantially the entire top sheet 30, but as long as it has a portion overlapping the lotion-containing region 32, it is also possible to provide it only in a part of the top sheet 30. For example, if the intermediate sheet 40 is shorter than the top sheet 30, it may be provided over substantially the entire area where the top sheet 30 and the intermediate sheet 40 overlap.

As long as the recesses 20 are present on the back surface of the top sheet 30, the surface of the top sheet 30 may be flat without irregularities as shown in FIGS. 10 to 13, it is preferable that the surface of the top sheet 30 is provided with irregularities in order to reduce surface friction. Such unevenness can be formed by embossing. In particular, as shown in the figure, when the top sheet 30 is embossed to extrude the top sheet 30 from the back side to the front side to form the depressions 20, when viewed from the front side of the top sheet 30, the depressions 20 on the back of the top sheet 30 correspond to each other. The protrusions 31 are formed in an overlapping (overlapping) arrangement, which is preferable because the retention of the hydrophilic lotion in the protrusions 31 that easily come into contact with the skin is enhanced. When the top sheet 30 is embossed in this way, if the top sheet 30 is made of the staple fiber non-woven fabric as described above, the depressions 20 and the protrusions 31 are formed more clearly, and the hydrophilic lotion is applied more effectively. It is preferable because it improves retention. Reference numeral 33 denotes a portion between adjacent convex portions 31, that is, a concave portion when viewed from the front side.

As an example, as shown in FIGS. 10 to 13, in the top sheet 30, the portions between the protrusions 31 adjacent in the width direction and the front-rear direction (the portions between the recesses 20 when viewed from the back side) are welded under pressure. It is preferable that a large number of top sheet joint portions 82 are formed in an intermittent joint pattern in the width direction and the front-rear direction by being joined to the intermediate sheet 40 by the . The top sheet joining portion 82 is also a portion that forms the bottom portion of the recess. In addition, in the bonding pattern of the top sheet 30 and the intermediate sheet 40, in the region between the convex portions 31 adjacent in the MD direction, a plurality of rows of the top sheet bonding portions 82 are arranged at intervals in the CD direction. , and the top sheet 30 and the intermediate sheet 40 are not welded in the CD direction interval part of the top sheet joint 82, and the top sheet 30 is compressed more than its MD direction both sides. and 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 compression section 83 , the intermediate sheet 40 may or may not be compressed integrally with the top sheet 30 . In addition, the top sheet 30 and the intermediate sheet 40 may not be welded to the portions other than the top sheet joining portion 82 and the compressed portion 83 and may be compressed in the same manner as the interval portion in the CD direction. It is desirable that the top sheet 30 is not welded and the top sheet 30 is not compressed (including not compressed at all) than the spaced portions in the CD direction. That is, when the thickness of the top sheet joint portion 82 of 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= Although T3 may be used, it is desirable that T1<T2<T3.

The shape of each top sheet joint portion 82 is not particularly limited, and may be any shape such as circular, elliptical, polygonal, star-shaped, cloud-shaped, etc., as well as the illustrated example.

As shown in FIG. 9(c), the lotion-containing region 32 may be provided only in the portion of the top sheet 30 having the recessed portion 20. As shown in FIG. That is, a large number of lotion-containing regions 32 can be provided corresponding to the arrangement of the recesses 20 . Of course, although not shown, as in the examples shown in FIGS. The lotion-containing region 32 may be provided only in the portion having the recessed portion 20 , that is, only in the convex portion 31 .

(Residual confirmation test of hydrophilic lotion on top sheet)
Using three types of topsheets (topsheet containing no cotton, topsheet containing 5% by weight cotton, and topsheet containing 15% by weight cotton), a tape type disposable with the structure shown in FIGS. 1 to 5 and 8 A required number of diaper samples (wherein the top sheet 30 does not have unevenness) were manufactured with the same specifications except for the top sheet 30, and the residual ratio of the hydrophilic lotion in the top sheet 30 was confirmed by the following method. Table 1 shows the specifications of each member. For each sample, a hydrophilic lotion was applied to the surface of the top sheet 30 after the assembly (bonding) of all the members was completed.

For each sample, the hydrophilic lotion was applied and allowed to stand in an environment of 30 ° C. for 5 hours. Taking the coating amount (see Table 1) as 100%, the glycerin residual rate after standing for 5 hours was calculated.

(Method for measuring remaining amount of hydrophilic lotion)
(a) The sample was unfolded and fixed on a desk with the top sheet 30 facing up.
(b) A required number of 3M blotting films (sebum-only absorption type, dimensions: length 85 mm x width 55 mm, basis weight 24 g/m ² , material: porous polyolefin film) were prepared.
(c) A weighing scale capable of measuring up to 0.1 mg was used to measure the weight of the oil removing film when not in use.
(d) Grasp the blotting film with a hand wearing a rubber glove and strongly rub it against the surface of the top sheet of the sample (however, the top sheet and the blotting film do not stretch or tear), and the top sheet contains I wiped off the hydrophilic lotion. At this time, every time the rubbing portion of the oil blotting film became transparent, the rubbing portion of the oil blotting film was changed to an unused portion while wiping was continued. In addition, in order to uniformly wipe the entire top sheet, the wiping locations on the top sheet were changed as needed.
(e) When about 80% of the oil-absorbing film became transparent, the weight of the used oil-absorbing film was measured with the above-mentioned balance, replaced with a new film, and the above (c) to (e) were repeated. . This work is based on the weight increase rate of the used oil removing film of the last two times (when the weight of the n-th time is W _n and the weight of the n-1 time is W _n-1 , (W _n -W _n-1 )×100/W _n−1 ) was reduced to 10% or less.
(f) When the above weight increase rate is 10% or less, the weight obtained by subtracting the total weight of all unused oil-absorbing films from the total weight of all used oil-absorbing films shall be the remaining amount of hydrophilic lotion. Quantity.

As a result of the test, as shown in FIG. 14, the glycerin residual rate was 66% for the top sheet containing no cotton, 83% for the top sheet containing 5 wt% cotton, and 83% for the top sheet containing 15 wt% cotton. The sheet was 97% and it was found that the reduction of glycerin in the topsheet was suppressed by the inclusion of cotton in the topsheet. From this, it was found that the greater the amount of cotton contained in the top sheet, the more the hydrophilic lotion contained in the top sheet was retained in the top sheet over time.

<Description of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

・"Front-back direction" means the direction (longitudinal direction) indicated by symbol LD in the figure, and "width direction" means the direction (left-right direction) indicated by WD in the figure. are orthogonal.

・"MD direction" and "CD direction" mean the flow direction (MD direction) and the transverse direction (CD direction) perpendicular to this in the manufacturing equipment, and one of them is the front-back direction depending on the part of the product and the other is the width direction. The MD direction of a nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned. It can be determined by a simple measurement method for determining the orientation direction.

- The "front side" means the side closer to the wearer's skin when worn, and the "back side" means the side farther from the wearer's skin when worn.

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

・"Area ratio" means the ratio of the target portion to the unit area, and is the percentage obtained by dividing the total area of the target portion (for example , the recessed portion 20 ) in the target region (for example , the top sheet 30 ) by the area of the target region. is represented by 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 pore area ratio can be measured by using, for example, VHX-1000 (trade name) manufactured by KEYENCE Co. under the following procedure under the measurement condition of 20 times.
(1) Set on a 20x lens and adjust the focus. Adjust the position of the non-woven fabric so that the target area fits in 4×6.
(2) Specify the brightness of the target area and measure the area of the hole.
(3) Click the color extraction of "area measurement" of "measurement/comment". Click on the part of the hole.
(4) Click "Batch measurement", check "Display measurement result window", and save as CSV data.

- "Elongation rate" means a value when the natural length is taken as 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.

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

- "Matsuke" is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (test location: temperature 23±1° C., relative humidity 50±2%) to a constant weight. Pre-drying refers to making a sample or test piece constant weight in an environment at a temperature of 100°C. Fibers with an official moisture content of 0.0% do not need to be pre-dried. Using a sampling template (100 mm x 100 mm), a sample with dimensions of 100 mm x 100 mm is cut from the constant weight specimen. The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as basis weight.

・The “thickness” is automatically measured using an automatic thickness gauge (KES-G5 handy compression measurement program) under the conditions of a load of 0.098 N/cm ² and a pressurized area of 2 cm ² . The thickness of the perforated nonwoven fabric is measured at portions other than the perforations and the protrusions around them.

・The amount of water absorption is measured according to JIS K7223-1996 "Testing method for water absorption of super absorbent polymer".

・The water absorption rate is the "time to the end point" when JIS K7224-1996 "Test method for water absorption rate of superabsorbent polymer" is performed using 2g of superabsorbent polymer and 50g of physiological saline. .

- The "deployed state" means a state of being flatly unfolded without contraction (including any contraction such as contraction due to an elastic member) or slack.

・Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

- "Melt viscosity" is measured at a specified temperature using a Brookfield type B viscometer (spindle No. 027) according to JIS Z 8803.

- The "maximum dimension" of a hole means the dimension in the MD direction or the dimension in the CD direction, whichever is longer.

・"Mean coefficient of friction MIU" and "variation deviation of mean coefficient of friction MMD" are measured using a friction tester KES-SE manufactured by Kato Tech Co., Ltd. (10 mm square silicone sensor, load 50 g), sensor movement distance. A value of 20 mm is meant. The movement direction (friction direction) of the sensor is the MD direction of the top sheet. When measuring the product, remove or cut off parts other than the top sheet in the product to the extent that the friction test on the surface of the top sheet is not affected (thus, for example, do not remove the parts welded to the top sheet), and in the unfolded state do the test.
When the dimension in the CD direction of the lotion-containing region in the top sheet is less than the dimension of the sensor (10 mm), the top sheet 30 is cut along the side edge of the lotion-containing region 32 as shown in FIG. 15(a). 15(b), the center of the sensor 100 is aligned with the center of the test piece 300 in the CD direction. Measure according to It should be noted that the hydrophilic lotion adhering to the surface of the sensor 100 is sufficiently wiped off after each measurement before the next measurement.
Moreover, when the lotion-containing region cannot be visually identified, the lotion-containing region can be identified by an appropriate method. For example, a necessary number of specimens (for measurement and position identification) having the same position of the lotion-containing region 32 are prepared, and the lotion-containing region 32 in the top sheet 30 of the specimen for position identification is surrounded with an appropriate coloring agent. After coloring in a different color and specifying the colored position using a ruler or an appropriate image measuring device, the lotion-containing region 32 Measurements can be carried out as As a substance capable of coloring the region 32 containing the hydrophilic lotion, a water leaking color developing agent "Moremir W" manufactured by Taseto Co., Ltd. can be preferably used. When measuring the dimension 32L in the MD direction and the dimension 32W in the CD direction of the lotion-containing region 32, the lotion-containing region 32 can also be specified by this method when measuring the surface moisture content, which will be described later.

・The “surface moisture content” is an average value calculated by measuring arbitrary three points of the lotion-containing region 32 using a moisture checker (MY-808S) manufactured by Scalar. The next measurement is performed after thoroughly wiping off the hydrophilic lotion adhering to the measurement surface of the moisture checker after each measurement.

- The "water activity value" can be measured with an electrical resistance water activity measuring device such as EZ-100ST (electrical resistance type) manufactured by Freund Corporation. Calibrate with a saturated solution before measurement. Measurement can be performed according to the electrical resistance test based on the Food Sanitation Inspection Guidelines. That is, collect a sample of a volume that is 3% or more of the internal space volume of the detector of the water activity measurement device, put it on an aluminum foil dish or an open flat dish, immediately put it in the detector and seal it, and The value is read at 10-minute intervals, and the water vapor pressure in the detector is considered to be in an equilibrium state when no change in the value is observed, and the value at that time is taken as the measured value of the sample. Each sample is measured three times, and the average value of the three measurements is taken as the water activity value.

- "Viscosity" is measured at a predetermined temperature using a Brookfield type B viscometer (spindle No. 027) according to JIS Z 8803.

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

INDUSTRIAL APPLICABILITY The present invention can be used for general disposable wearing articles such as underpants-type disposable diapers, tape-type disposable diapers, pad-type disposable diapers, disposable swimsuits, diaper covers, sanitary napkins, and the like.

DESCRIPTION OF SYMBOLS 11... Liquid impermeable sheet, 12... Exterior nonwoven fabric, 20... Hollow part, 30... Top sheet, 30a... First layer, 30b... Second layer, 40... Intermediate sheet, 50... Absorbent element, 56... Absorbent body, 58... Packaging sheet, 60... Raised gathers, 62... Gathered sheets, LD... Back-and-forth direction, WD... Width direction, 29... Hydrophobic hot-melt adhesive, 31... Convex part, 32... Lotion-containing region.

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