Disposable wearing items

Abstract

The above-mentioned problem is solved by the following disposable wearing article, characterized in that the disposable wearing article comprises: a top sheet (30) including a skin contact area that contacts the skin of the wearer; and a back side component that is adjacent to the back side of the top sheet (30), the skin contact area being provided with a hydrophilic liquid, the top sheet (30) being pressed from the back side to the front side by embossing, and recessed portions (20) being formed at intervals on the back side of the liquid-containing area (32) of the top sheet (30), the recessed portions (20) being formed between the top sheet (30) as the upper surface and the back side component, and the contact area between the top sheet (30) provided with the hydrophilic liquid and the back side component is reduced due to the presence of the recessed portions (20).

Description

Technical Field

[0001] The present invention relates to disposable wearing articles such as disposable diapers and sanitary napkins. Background Art

[0002] In disposable wearing articles, particularly disposable diapers, the wearer's skin becomes rough, and particularly rashes often become a problem. As its main cause, physical stimulation (friction or hardness, excrement) to the wearer's skin and dry skin can be cited.

[0003] As a method for solving such a problem, the following method has been proposed: a liquid coating that is semi-solid or solid at 20°C and can be partially transferred to the wearer's skin is applied to a liquid-permeable top sheet, and the liquid transferred to the wearer's skin forms a barrier, thereby facilitating the removal of excrement (see Patent Document 1).

[0004] In addition, there is also a known method of applying a hydrophilic agent liquid to a top sheet made of nonwoven fabric to reduce friction, etc. (see Patent Document 2). A hydrophilic agent liquid is preferred in terms of being able to reduce the hardness of the waxy substance and prevent a decrease in liquid permeability. In particular, a hydrophilic agent liquid containing water is preferred in order to prevent dryness of the skin.

[0005] However, when a hydrophilic agent liquid containing water is used on a top sheet made of a short-fiber nonwoven fabric, there is a problem that the effect does not increase as much as expected.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2010-75733

[0009] Patent Document 2: Japanese Patent Application No. 2010-526630

[0010] Patent Document 3: Japanese Patent Application Publication No. 2016-096926 Summary of the invention

[0011] Problems to be solved by the invention

[0012] Therefore, a main subject of the present invention is to improve the effect when a hydrophilic agent liquid is applied to the top sheet.

[0013] Means for solving problems

[0014] The present inventors obtained the following insights during the process of studying a top sheet composed of a nonwoven fabric containing a hydrophilic agent liquid (the hydrophilic agent liquid contains water). That is, it is believed that when a hydrophilic agent liquid containing water is applied to a top sheet composed of a short fiber nonwoven fabric, after manufacturing, the hydrophilic agent liquid is easily transferred to the components arranged on the back side of the top sheet, and the hydrophilic agent liquid is difficult to be retained on the top sheet as expected, so the effect brought by the hydrophilic agent liquid is lower than expected. The disposable wearing article described below is based on this insight.

[0015] <Method 1>

[0016] A disposable wearing article, characterized in that the disposable wearing article comprises: a top sheet, which includes a skin contact area that contacts the wearer's skin; and a back side component, which is adjacent to the back side of the top sheet, the top sheet is a liquid-permeable non-woven fabric, the skin contact area has a liquid-containing area containing a hydrophilic liquid, the hydrophilic liquid contains water, on the back side of the top sheet, recessed portions that are recessed toward the front side are arranged at intervals, the upper surface of the recessed portion and the back side component are spaced apart, and the liquid-containing area has a portion overlapping with the recessed portion.

[0017] (Effect)

[0018] In the disposable wearing article, on the back of the agent liquid containing region of the top sheet, recessed portions that are recessed toward the front side are arranged at intervals, and there is a gap between the upper surface of these recessed portions and the back side component. The agent liquid containing region has a portion overlapping with the recessed portions, so the contact area between the top sheet and the back side component is reduced, and the hydrophilic agent liquid given to the top sheet is not easily transferred to the back side component, and is easy to remain on the top sheet. Thus, the effect of the hydrophilic agent liquid given to the top sheet can be improved compared with the past. In other words, the amount of hydrophilic agent liquid given can be saved while achieving the same effect.

[0019] <Method 2>

[0020] According to the disposable wearing article of the first embodiment, the liquid-containing area has a dimension of 30 mm or more in the front-to-back direction and a dimension of 5 mm or more in the width direction, the recessed portions have a dimension of 3 mm to 8 mm in the front-to-back direction and a dimension of 3 mm to 5 mm in the width direction, and are arranged in the entire skin contact area of ​​the top sheet at intervals in the front-to-back direction that are shorter than the dimension of the liquid-containing area in the front-to-back direction and at intervals in the width direction that are shorter than the dimension of the liquid-containing area in the width direction.

[0021] (Effect)

[0022] The size of the liquid-containing area and the size and arrangement of the recessed portions can be appropriately determined, but if they are within the scope of this method, even if the position of the liquid-containing area changes slightly due to manufacturing errors, etc., the liquid-containing area can reliably have a portion that overlaps with the recessed portion, so it is preferred.

[0023] <Third Method>

[0024] The disposable wearing article according to the first or second aspect, wherein the top sheet has a fineness of 1 dtex to 3 dtex and a weight per unit area of ​​10 g / m 2 ~30g / m 2 The short-fiber nonwoven fabric has a thickness of 0.4 mm to 1.4 mm. The top sheet is embossed from the back side to the front side, so that the recessed portion is formed on the back side of the top sheet, and a convex portion protruding along the inner surface of the recessed portion is formed on the front side of the top sheet, and the recessed portion is formed between adjacent convex portions on the front side of the top sheet.

[0025] (Effect)

[0026] As long as there is a recessed portion on the back side of the top sheet, the front side of the top sheet may not have concavoconvex, and is flat, but in the case of realizing the air permeability on the front side of the top sheet, alleviating the surface friction, preferably, the front side of the top sheet is formed with concavoconvex. In this case, if the recessed portion on the back side of the top sheet and the convex portion on the front side of the top sheet are formed correspondingly by embossing such as this mode, the convex portion that is easy to contact with the skin becomes higher to the retention of the hydrophilic agent liquid, so it is preferred.

[0027] In addition, when such embossing is performed on the top sheet, if the top sheet is a short fiber nonwoven fabric as in this embodiment, the concave portion and the convex portion can be formed more clearly, so it is preferred. Moreover, in the combination of the hydrophilic agent liquid and the top sheet of the short fiber nonwoven fabric as in this embodiment, if a nonwoven fabric with fine fibers is used, the retention of the hydrophilic agent liquid is improved, so it is preferred.

[0028] <Method 4>

[0029] A disposable wearing article according to any one of the first to third aspects, wherein the depth of the recessed portion is 0.5 mm to 3 mm, the dimension of the recessed portion in the front-to-back direction is longer than the shortest interval between the recessed portions adjacent to each other in the front-to-back direction, and the dimension of the recessed portion in the width direction is longer than the shortest interval between the recessed portions adjacent to each other in the width direction.

[0030] (Effect)

[0031] The depth and size of the recessed portions can be appropriately determined. However, as in the present embodiment, when the area ratio of the recessed portions is sufficiently higher than that of portions other than the recessed portions, the top sheet has a better retention property for the hydrophilic agent liquid.

[0032] <Method 5>

[0033] A disposable wearing article according to any one of the first to fourth aspects, wherein the hydrophilic liquid contains 70 to 90% by weight of glycerin and 10 to 30% by weight of water, and the content of the hydrophilic liquid per unit area in the liquid-containing region is 5 g / m 2 ~15g / m 2 .

[0034] (Effect)

[0035] The composition of the hydrophilic agent solution and the agent solution content in the agent solution-containing region can be appropriately determined, but are preferably within the range of the present embodiment.

[0036] <Sixth Method>

[0037] The disposable wearing article according to any one of the first to fifth aspects, wherein the viscosity of the hydrophilic agent liquid at a temperature of 20 degrees is 150 mPa·s to 400 mPa·s.

[0038] (Effect)

[0039] As the top sheet, a nonwoven fabric made of hydrophobic resin fibers is preferred because of its low cost, but in this state, the retention of the hydrophilic agent liquid containing water is poor. Therefore, it is preferred to make the viscosity of the hydrophilic agent liquid within the range of this embodiment to improve the retention of the nonwoven fabric to the hydrophilic agent liquid.

[0040] <Seventh Method>

[0041] The disposable wearing article according to any one of the first to sixth aspects, wherein the nonwoven fabric is a nonwoven fabric of hydrophilic fibers obtained by coating hydrophilic agents on hydrophobic resin fibers.

[0042] (Effect)

[0043] As the top sheet, a nonwoven fabric made of hydrophobic resin fibers is preferred because of its low cost, but in this state, the retention of hydrophilic agent liquid containing water is poor. Therefore, in this case, it is preferred to use a nonwoven fabric made of hydrophilic fibers obtained by using a hydrophilic agent to improve the retention of the nonwoven fabric to the hydrophilic agent liquid.

[0044] Effects of the Invention

[0045] According to the present invention, there is an advantage that the effect when a hydrophilic agent liquid is applied to the top sheet is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1It is a top view showing the inner surface of the belt-type disposable diaper in the unfolded state.

[0047] Figure 2 It is a top view showing the outer surface of the belt-type disposable diaper in the unfolded state.

[0048] Figure 3 is along Figure 1 A cross-sectional view of line 6-6.

[0049] Figure 4 is along Figure 1 A cross-sectional view of line 7-7.

[0050] Figure 5 In the figure, (a) is along Figure 1 The cross-sectional view along line 8-8 of FIG. Figure 1 The cross-sectional view along line 9-9 of FIG. Figure 1 A cross-sectional view of line 10-10.

[0051] Figure 6 It is a top view of the top sheet and auxiliary sheet.

[0052] Figure 7 It is a cross-sectional view of the top sheet and the auxiliary sheet.

[0053] Figure 8 is shown along Fig.10 (b) The cross section of line 1-1, along Fig.10 (b) The cross section of line 2-2, along Fig.10 (b) Cross-sectional view along line 3-3.

[0054] Fig. 9 It is an enlarged top view of the bonding pattern of the top sheet bonding part.

[0055] Fig.10 It is an enlarged top view of the bonding pattern of the top sheet bonding part.

[0056] Fig.11 It is a top view showing the inner surface of the belt-type disposable diaper in the unfolded state.

[0057] Fig.12 It is a top view showing the inner surface of the belt-type disposable diaper in the unfolded state.

[0058] Fig.13 This is a top view for illustrating the sample. DETAILED DESCRIPTION

[0059] Figures 1 to 5A belt-type disposable diaper as an example of a disposable wearing article is shown. The symbol X in the figure represents the full width of the diaper excluding the connecting belt, and the symbol L represents the full length of the diaper. In addition, the dot pattern portion in the cross-sectional view represents an adhesive as a joining means for joining the various components together. The hot melt adhesive can be applied by slit coating, continuous linear or dotted droplet coating, spiral, Z-shaped, wavy spraying, or pattern coating (transfer of hot melt adhesive achieved by relief printing) and other well-known methods. At the fixed part of the elastic component, the hot melt adhesive can be applied to the outer peripheral surface of the elastic component instead of these methods or in combination with them, and the elastic component is fixed to the adjacent component. As a hot melt adhesive, there are adhesives such as EVA series, adhesive rubber series (elastic system), olefin series, polyester and polyamide series, which can be used without special restrictions. As a joining means for joining the various components together, means based on material welding such as heat sealing or ultrasonic sealing can also be used.

[0060] In addition, as the non-woven fabric in the following description, known non-woven fabrics can be appropriately used according to the location and purpose. As the constituent fibers of the non-woven fabric, in addition to synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. (in addition to single-component fibers, composite fibers such as core-sheath fibers are also included), regenerated fibers such as rayon or cuprammonia fibers, natural fibers such as cotton, etc. can also be selected without special restrictions, and they can also be mixed and used. In order to improve the softness of the non-woven fabric, the constituent fibers are preferably crimped fibers. In addition, the constituent fibers of the non-woven fabric can be hydrophilic fibers (including fibers that are hydrophilic with the help of a hydrophilic agent), or can be hydrophobic fibers or water-repellent fibers (including fibers that are water-repellent with the help of 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, hot-rolled (hot air) nonwoven fabrics, needle-punched nonwoven fabrics, point-bonded nonwoven fabrics, laminated nonwoven fabrics (in addition to SSS nonwoven fabrics obtained by laminating the same or similar nonwoven fabric layers, SMS nonwoven fabrics, SMMS nonwoven fabrics, etc., which are laminated with different nonwoven fabric layers and a meltblown layer sandwiched between spunbond layers), etc., and any of these nonwoven fabrics can be used. Laminated nonwoven fabrics refer to nonwoven fabrics that are manufactured as a single nonwoven fabric including all layers and are subjected to fiber bonding processing throughout all layers, and do not include nonwoven fabrics that are obtained by bonding multiple nonwoven fabrics manufactured separately by means of bonding means such as hot melt adhesives.

[0061] The belt-type disposable diaper has a ventral portion F extending from the center of the front-to-back direction LD to the front side, and a dorsal portion B extending from the center of the front-to-back direction LD to the rear side. In addition, the shape of the belt-type disposable diaper has a crotch portion M extending from a position closer to the front side than the center of the front-to-back direction of the product to a position closer to the rear side than the center of the front-to-back direction of the product; a front wing 80 protruding to the left and right sides at a position away from the center of the front-to-back direction of the product to the front side; and a rear wing 81 protruding to the left and right sides at a position away from the center of the front-to-back direction of the product to the rear side. The belt-type disposable diaper also has an absorbent body 56 built into the range 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 outer nonwoven fabric 12 covering the back side of the liquid-impermeable sheet 11, constituting the outer surface of the product.

[0062] The materials and features of each component are described below in order.

[0063] (Absorber)

[0064] The absorbent body 56 is a part that absorbs and holds the excrement, and can be formed of a fiber aggregate. As the fiber aggregate, in addition to a fiber aggregate obtained by piling short fibers such as cotton pulp or synthetic fibers, a filament aggregate obtained by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate as needed can also be used. The weight per unit area of ​​the fiber can be, for example, about 100 g / m2 when piling cotton pulp or short fibers. 2 ~300g / m 2 In the case of a filament assembly, for example, it may be about 30 g / m 2 ~120g / m 2 The fineness of the synthetic fiber is, for example, 1 dtex to 16 dtex, preferably 1 dtex to 10 dtex, and more preferably 1 dtex to 5 dtex.

[0065] The planar shape of the absorber 56 can be appropriately determined, and may be a rectangular shape or a shape that narrows in the middle of the front-back direction LD along the leg circumference. Figure 1 In the embodiment of the present invention, an absorbent body 56 is provided, but the absorbent article of the present invention may not have an absorbent body.

[0066] (Superabsorbent polymer particles)

[0067] A part or the whole of the absorbent body 56 may contain superabsorbent polymer particles. Superabsorbent polymer particles include "powder" in addition to "particles". As superabsorbent polymer particles, superabsorbent polymer particles used in such absorbent articles may be used directly. The particle size of the superabsorbent polymer particles is not particularly limited, but it is desirable that the particle size is such that, for example, when screening (vibration for 5 minutes) using a 500 μm standard sieve (JIS Z 8801-1: 2006) is performed, and the particles falling below the sieve in the screening are screened (vibration for 5 minutes) using a 180 μm standard sieve (JIS Z 8801-1: 2006), the proportion of particles remaining on the 500 μm standard sieve is 30% by weight or less, and the proportion of particles remaining on the 180 μm standard sieve is 60% by weight or more.

[0068] The material of the superabsorbent polymer particles can be used without particular limitation, but preferably a material having a water absorption of 40 g / g or more. The superabsorbent polymer particles include starch-based, cellulose-based, synthetic polymer-based superabsorbent polymer particles, and superabsorbent polymer particles such as starch-acrylic acid (salt) graft copolymers, starch-acrylonitrile copolymer saponification products, sodium carboxymethyl cellulose crosslinked products, and acrylic acid (salt) polymers can be used. As the shape of the superabsorbent polymer particles, the commonly used powdery granular shape is preferred, but other shapes can also be used.

[0069] As the super absorbent polymer particles, it is preferable to use super absorbent polymer particles having a water absorption rate of 70 seconds or less, particularly 40 seconds or less. If the water absorption rate is too slow, liquid supplied into the absorbent body 56 tends to flow back to the outside of the absorbent body 56, so-called backflow.

[0070] In addition, as the superabsorbent polymer particles, it is preferable to use superabsorbent polymer particles having a gel strength of not less than 1000 Pa. Thus, even when a bulky absorbent body 56 is used, it is possible to effectively suppress a sticky feeling after liquid absorption.

[0071] The weight per unit area of ​​the superabsorbent polymer particles can be appropriately determined according to the absorption amount required according to the use of the absorbent body 56. Therefore, although it cannot be generalized, it can be 50 g / m2 in general. 2 ~350g / m 2 .

[0072] (Packaging Sheet)

[0073] In order to prevent the high absorbent polymer particles from escaping, or to improve the shape retention of the absorbent body 56, the absorbent body 56 can be built in as an absorbent member 50 wrapped in a packaging sheet 58. As the packaging sheet 58, thin paper, especially crepe paper, nonwoven fabric, polyethylene laminated nonwoven fabric, a sheet with small holes, etc. can be used. However, a sheet from which the high absorbent polymer particles do not escape is preferred. When a nonwoven fabric is used instead of crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly preferred, and its material can be polypropylene, polyethylene / polypropylene, etc. The weight per unit area of ​​the fiber is preferably 5 g / m 2 ~40g / m 2 , particularly preferably 10 g / m 2 ~30g / m 2 .

[0074] The packaging sheet 58 is like Figure 3 In addition to the structure in which the entire absorbent body 56 is wrapped with a single sheet as shown, the entire absorbent body 56 may be wrapped with a plurality of sheets such as two sheets above and below. The wrapping sheet 58 may be omitted.

[0075] (Top sheet)

[0076] The top sheet 30 extends from the front end to the rear end of the product in the front-to-back direction, and extends laterally than the absorbent body 56 in the width direction WD. However, for example, in the case where the starting point of the later-described standing pleats 60 is closer to the center side of the width direction WD than the side edge of the absorbent body 56, appropriate deformation such as making the width of the top sheet 30 shorter than the full width of the absorbent body 56 can be performed as needed.

[0077] The top sheet 30 has a skin contact area that contacts the wearer's skin, and is preferably a nonwoven fabric from the viewpoint of liquid permeability and skin feel. Various nonwoven fabrics can be used for the top sheet 30, but in consideration of cushioning, softness, and permeability of soft stool (watery stool or muddy stool), short-fiber nonwoven fabrics such as hot air nonwoven fabrics are preferred over long-fiber (continuous fiber) nonwoven fabrics. Generally, a fineness of 1 dtex to 10 dtex and a weight per unit area of ​​10 g / m2 are preferred. 2 ~30g / m 2 , a short-fiber nonwoven fabric having a thickness of about 0.4 mm to 1.4 mm. The fiber length of the short-fiber nonwoven fabric is not particularly limited, but is preferably about 20 mm to 100 mm.

[0078] (Middle piece)

[0079] In order to make the liquid that has passed through the top sheet 30 quickly transfer to the absorbent, a hydrophilic intermediate sheet (also referred to as "auxiliary sheet") 40 can be provided. The intermediate sheet 40 is used to make the liquid quickly transfer to the absorbent and improve the absorption performance of the absorbent, and prevent the "backflow" phenomenon of the absorbed liquid backflowing from the absorbent. The intermediate sheet 40 of this example is equivalent to the back side component adjacent to the back side of the top sheet 30, but the intermediate sheet 40 can also be omitted. In this case, the packaging sheet 58 becomes the back side component, and when the packaging sheet 58 is also omitted, the absorbent 56 becomes the back side component.

[0080] As the middle sheet 40, a liquid-permeable sheet such as a nonwoven fabric can be used. As the middle sheet 40, a hot air nonwoven fabric is particularly preferred because it is fluffy. The hot air nonwoven fabric preferably uses a composite fiber with a core-sheath structure. In this case, the resin used for the core can be polypropylene (PP), but preferably polyester (PET) with high rigidity. In the case of using such a nonwoven fabric of a hydrophobic synthetic fiber, it can be made into a hydrophilic nonwoven fabric by using a known hydrophilic agent. The weight per unit area of ​​the nonwoven fabric is preferably 17 g / m 2 ~80g / m 2 , more preferably 18g / m 2 ~60g / m 2 The thickness of the material fibers of the nonwoven fabric is preferably 2.0 dtex to 10 dtex. In order to make the nonwoven fabric bulky, it is preferred to use mixed fibers in which eccentric fibers whose core is not located in the center, hollow fibers, or eccentric and hollow fibers are used as all or part of the material fibers.

[0081] The intermediate piece 40 of the illustrated example is shorter than the width of absorber 56 and is configured in the center, but can also be provided over the full width range. In addition, the intermediate piece 40 can be provided over the full length range of the diaper, but can also be provided only at the middle part including the excretion position on the front-back direction LD as illustrated.

[0082] (Liquid-impermeable sheet)

[0083] The liquid-impermeable sheet 11 is not particularly limited, but preferably has moisture permeability. As the liquid-impermeable sheet 11, for example, a microporous sheet obtained by mixing an inorganic filler with an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching it in a uniaxial or biaxial direction can be preferably used. In addition, as the liquid-impermeable sheet 11, a material with a nonwoven fabric as a base material and improved waterproofness can also be used.

[0084] The liquid-impermeable sheet 11 preferably extends over the same range as or wider than the absorbent body 56 in the front-to-back direction LD and the width direction WD. However, when there are other water-blocking measures, a structure that does not cover the ends of the absorbent body 56 in the front-to-back direction LD and the width direction WD may be adopted as needed.

[0085] (Non-woven fabric for exterior)

[0086] The outer nonwoven fabric 12 covers the entire back side of the liquid-impermeable sheet 11, so that the outer surface of the product has a cloth-like appearance. The weight per unit area of ​​the fibers of the outer nonwoven fabric 12 is preferably 10 g / m 2 ~50g / m 2 , particularly preferably 15g / m 2 ~30g / m 2 The outer nonwoven fabric 12 may be omitted, in which case the liquid-impermeable sheet 11 may be extended to the side edge of the product.

[0087] (Stand up pleats)

[0088] In order to stop excrement moving laterally on the top sheet 30 and prevent so-called side leakage, it is preferred that standing gathers 60 standing up toward the skin side of the wearer are provided on both sides of the front width direction WD. Of course, the standing gathers 60 may be omitted.

[0089] When the erected pleats 60 are used, the structure of the erected pleats 60 is not particularly limited, and all known structures can be used. The erected pleats 60 shown in the figure is composed of the following parts: a pleated sheet 62, which is substantially continuous in the width direction WD; and an elongated pleated elastic member 63, which is fixed to the pleated sheet 62 in an extended state along the front-to-back direction LD. As the pleated sheet 62, a water-repellent nonwoven fabric can be used, and as the pleated elastic member 63, a rubber thread or the like can be used. In addition to elastic members such as Figure 1 and Figure 2 Instead of providing a plurality of wires on each side as shown, only one wire may be provided on each side.

[0090] The inner surface of the pleated sheet 62 has a joining starting end in the width direction WD on the side of the top sheet 30, and the portion toward the outside in the width direction from the joining starting end is joined to the inner surface of each side flap SF by means of a hot melt adhesive or the like, that is, in the example shown in the figure, the side of the liquid-impermeable sheet 11 and the side of the outer non-woven fabric 12 on the outside in the width direction thereof.

[0091] At the leg circumference, the portion of the standing pleats 60 that is closer to the center side in the width direction than the starting end of the connection is fixed to the top sheet 30 at both ends in the front-to-back direction of the product, but the portion between them is an unfixed free portion, which stands up with the help of the contraction force of the elastic component 63, so as to fit closely to the body surface.

[0092] (end wing, side wing)

[0093] The belt-type disposable diaper shown in the example of the figure has: a pair of end wings EF, which extend to the front and rear sides of the absorber 56 respectively, and do not have the absorber 56; and a pair of side wings SF, which extend to the side of the side edges of the absorber 56 respectively, and do not have the absorber 56. The side wings SF can be composed of a main body sheet (external nonwoven fabric 12, etc.) continuous from the part with the absorber 56 as shown in the example of the figure, or can be formed by attaching other materials.

[0094] (Flat pleats)

[0095] The side elastic members 64, which are made of elongated elastic members such as rubber threads, are fixed to each side flap SF in an extended state along the front-back direction LD, so that the leg circumference portion of each side flap SF is formed into a flat pleat. The side elastic members 64 may be provided between the pleated sheet 62 and the liquid-impermeable sheet 11 on the outside in the width direction near the joining start end in the joining portion of the pleated sheet 62 as shown in the example in the figure, or between the liquid-impermeable sheet 11 and the outer nonwoven fabric 12 at the side flap SF. In addition to providing a plurality of side elastic members 64 on each side as shown in the example in the figure, only one side elastic member 64 may be provided on each side. Of course, the side elastic members 64 (flat pleats) may also be omitted.

[0096] The plane gathers are the parts where the contraction force of the side elastic members 64 acts (the part where the side elastic members 64 are shown in the figure). Therefore, in addition to the form where the side elastic members 64 exist only in the plane gathers, there is also a structure in which the side elastic members 64 exist throughout the front side, the rear side, or both sides of the plane gathers, but the side elastic members are finely cut at one or more places outside the plane gathers, or are not fixed to the sheet sandwiching the side elastic members 64, or both of these situations exist, so that the contraction force does not act on the parts outside the plane gathers (substantially equivalent to not providing the elastic members), and the contraction force of the side elastic members 64 acts only on the plane gathers.

[0097] (Front wing)

[0098] This belt type disposable diaper has a front flap 80 protruding to both sides at a position away from the center of the front and rear direction of the product. The front flap can also be omitted (that is, it is set to a shape in which the width does not change from the narrowest part of the product to the front end of the product).

[0099] The dimension of the front wing 80 in the width direction WD can be appropriately determined, for example, 5% to 20% (particularly 7% to 15%) of the total length L of the article. The dimension of the front wing 80 in the width direction WD can be substantially the same as the dimension of the rear wing 81 described later in the width direction WD.

[0100] (Rear wing)

[0101] The present belt-type disposable diaper has rear wings 81 protruding to both left and right sides at positions spaced rearward from the center in the front-rear direction of the product.

[0102] The dimension of the rear wing 81 in the width direction WD can be appropriately determined, and may be the same as the dimension of the front wing 80 in the width direction, or may be smaller or larger than the dimension of the front wing 80 in the width direction.

[0103] (Middle part)

[0104] The side edges 15 of the product on both sides between the front wing 80 and the rear wing 81 may have, for example, a substantially straight portion as follows: a direction with an acute side crossing angle of less than ±2 degrees relative to the front-rear direction LD as the center, extending within a range of ±5 mm in a direction perpendicular to the center. The side edges 15 of the product on both sides between the front wing 80 and the rear wing 81 may also be wavy or arc-shaped (not shown), or may be straight as shown in the example in the figure.

[0105] (Wing formation)

[0106] As shown in the example in the figure, by cutting the side portion of the side wing SF into a concave shape, it is possible to form a whole concave edge from the lower edge of the front wing 80 through the side edges 15 of the product on both sides between the front wing 80 and the rear wing 81 to the lower edge of the rear wing 81. In this case, the stacking structure of the front wing 80 and the rear wing 81 is determined by the stacking structure of the side wing SF. In the example in the figure, the front wing 80 and the rear wing 81 are formed by the pleated sheet 62 and the outer non-woven fabric 12. Although not shown in the figure, a front extension piece protruding laterally from the side wing SF can also be provided, and the front extension piece forms the entirety of the front wing 80 or a part of the terminal side. Similarly, a rear extension piece protruding laterally from the side wing SF can also be provided, and the rear extension piece forms the entirety of the rear wing piece 81 or a part of the terminal side. Various non-woven fabrics can be used as the front extension piece and the rear extension piece.

[0107] (Connection)

[0108] The back wing 81 has a connecting portion 13A that is detachably connected to the ventral part F when worn. That is, when worn, the two side portions of the back wing 81 are wrapped around the wearer's ventral side, and the connecting portion 13A of the back wing 81 is connected to the outer surface of the ventral part F. As the connecting portion 13A, in addition to the hook (male component) of the mechanical fastener (surface fastener), an adhesive layer can also be provided. The hook has a plurality of engaging protrusions on its connecting surface, and the shape of the engaging protrusions can be any known shape such as a レ shape, a J shape, a mushroom shape, a T shape, a double J shape (a shape obtained by connecting J-shaped components back to back).

[0109] In addition to being directly mounted on the rear wing 81, the connecting portion 13A can also be mounted on the rear wing 81 by mounting the connecting belt 13 having the connecting portion 13A as shown in the example. The structure of the connecting belt 13 is not particularly limited. In the example shown in the figure, the connecting belt 13 has a belt mounting portion 13C fixed to the side wing SF, a belt main body 13B protruding from the belt mounting portion 13C, and a connecting portion 13A provided in the middle of the width direction WD of the belt main body 13B, and the portion closer to the end side than the connecting portion 13A becomes a gripping portion. As a sheet formed from the belt mounting portion 13C to the belt main body 13B, nonwoven fabric, plastic film, polyethylene laminated nonwoven fabric, paper, or a composite material thereof can be used.

[0110] The connection part 13A on the outer surface of the ventral part F can be appropriately determined. Only the main body located between the left and right front wings 80 can be set as the connection part, or the range from the side of the main body to the base end of the front wing 80 can be set as the connection part. These connection parts are preferably easy to connect the connection part 13A, and a target piece 24 having a target part for facilitating connection can also be provided. For example, in the case where the connection part 13A is a hook (male part) of a mechanical fastener (surface fastener), the connection part on the outer surface of the ventral part F can be formed using a loop member (female part) of the mechanical fastener or a nonwoven fabric. As the loop member, a loop member obtained by sewing a terry loop on a plastic film is also known, but from the viewpoint of air permeability and softness, it is preferably a long fiber nonwoven fabric (fineness 2.0 dtex to 4.0 dtex, weight per unit area of ​​20 g / m2) in which the continuous direction of the fiber is the width direction WD 2 ~50g / m 2 , spunbonded nonwoven fabric with a thickness of about 0.3 mm to 0.5 mm, etc., are provided with welded portions obtained by welding fibers to each other at least intermittently in the width direction WD. In the case where the area including the connecting portion on the outer surface of the ventral part F is formed by the outer nonwoven fabric 12 as in the example shown in the figure, the hook member can be connected to the outer nonwoven fabric 12 without any addition. If necessary, the loop member can also be pasted only on the connecting portion on the outer surface of the ventral part F. In addition, in the case where the connecting portion 13A is an adhesive material layer, a plastic film with a smooth surface and a strong adhesiveness can also be pasted on the connecting portion on the outer surface of the ventral part F.

[0111] (Fixation of top sheet)

[0112] The top sheet 30 is preferably bonded to the back side component disposed on the back side of the top sheet 30 by means of a hydrophobic hot melt adhesive 29. Alternatively or in combination with this method, the top sheet 30 may be joined to the back side component disposed on the back side by fusing at least one of the top sheet 30 and the back side component disposed on the back side thereof. The fixing area of ​​the top sheet 30 may be spread over the entire top sheet 30 or may be only the area in contact with the top sheet 30 except for the recessed portion 20. In the illustrated example, the back side component is the intermediate sheet 40, the packaging sheet 58, and the liquid-impermeable sheet 11, but is not limited thereto.

[0113] As the hydrophobic hot melt adhesive 29, EVA-based, olefin-based, polyester-based, polyamide-based, and the like can be used, and adhesive rubber-based (elastic-based) adhesives are particularly preferably used.

[0114] The amount of the hydrophobic hot melt adhesive 29 applied can be appropriately determined, but in general, it can be about 0.1 g / m 2 ~10g / m 2 In particular, if the amount of the hydrophobic hot melt adhesive 29 applied is about 0.5 g / m 2 ~5g / m 2 , it is possible to suppress the hot melt adhesive 29 from overflowing into the recessed portion 20, so it is preferred, but it is easy to cause adhesion obstruction caused by the hydrophilic agent liquid described later, so it is preferably combined with the design of the coating pattern of the hydrophilic agent liquid. The coating pattern of the hydrophobic hot melt adhesive 29 can be appropriately determined, and it is ideal to be a dense pattern (spraying in a spiral, Z-shaped, wavy, etc.) with tiny non-coated parts dispersed, but it can also be a continuous surface coating pattern such as slit coating.

[0115] (Area containing liquid)

[0116] like Figure 7 , Fig.11 and Fig.12As shown, the skin contact area of ​​the top sheet 30 has a liquid-containing area 32 containing a hydrophilic liquid, wherein the hydrophilic liquid contains water. If the size of the liquid-containing area is too small, the friction reduction effect is local, and the significance of protecting the wearer's skin is small. Therefore, the liquid-containing area 32 preferably has a size 32L in the MD direction (in the example of the figure, the front-to-back direction LD) of more than 30 mm and a size 32W in the CD direction (in the example of the figure, the width direction WD) of more than 5 mm. The size 32L in the MD direction of the liquid-containing area 32 is more preferably more than 50 mm, and particularly preferably more than 100 mm. The upper limit of the size 32L in the MD direction of the liquid-containing area 32 is the total length L of the product, but it can also be shorter than this. The size 32W in the CD direction of the liquid-containing area 32 is more preferably more than 10 mm. The upper limit of the size 32W in the CD direction of the liquid-containing area 32 is the size in the width direction WD of the top sheet 30, but it can also be shorter than this.

[0117] The agent-containing liquid region 32 may be provided at only one place with a relatively large area, or may be provided at multiple places. The agent-containing liquid region 32 is preferably provided in a longitudinal stripe shape as shown in the example, but may also be provided in a transverse stripe shape. In these cases, the interval 32X between adjacent agent-containing liquid regions 32 may be appropriately determined, but is preferably about 1.5 mm to 10 mm, for example.

[0118] The nonwoven fabric of the top sheet 30 preferably has a fineness of 1 dtex to 3 dtex (more preferably 1.5 dtex to 2.5 dtex) and a weight per unit area of ​​10 g / m 2 ~30g / m 2 (More preferably 15g / m 2 ~25g / m 2 ), a short fiber nonwoven fabric with a thickness of 0.4 mm to 1.4 mm (more preferably 0.5 mm to 1.0 mm). That is, the thickness of the fibers of such a short fiber nonwoven fabric helps to reduce the friction of the surface, and combined with the friction reduction effect achieved by the hydrophilic agent liquid, the overall friction reduction effect is improved. In addition, since the fibers are thin, the retention of the hydrophilic agent liquid is also improved, thereby improving the friction reduction effect. More specifically, through the combination of the above-mentioned short fiber nonwoven fabric and the hydrophilic agent liquid, the average friction coefficient MIU of the agent liquid-containing area in the top sheet 30 is preferably 0.2 to 0.4.

[0119] The surface moisture content of the agent-containing region 32 is not particularly limited, but is preferably 3% to 10%, particularly 4% to 8%, because it can appropriately moisten the wearer's skin and prevent dryness.

[0120] As long as the hydrophilic agent contains water, the composition of the components other than water is not particularly limited. For example, as the components other than water of the hydrophilic agent, one or more can be selected from the following components: glycerol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, polyethylene glycol, sorbitol, xylitol, sodium pyrrolidone carboxylate, and sugars such as trehalose, mucopolysaccharides (such as hyaluronic acid and its derivatives, chondroitin sulfate 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 octyl dodecyl ester, seaweed extract, purple orchid root (Bletilla striata) extract, various amino acids and their derivatives, etc. In addition, as an additive, one or more additives selected from the group of emulsifiers, phosphate esters, paraffin and surfactants can be contained. As a surfactant, an ether-type nonionic surfactant and a nonionic surfactant containing EO / PO type are preferred. The hydrophilic agent liquid may contain a preservative in order to improve the shelf life of the product. However, since the hydrophilic agent liquid is transferred to the skin to moisten the skin, it is preferable that the hydrophilic agent liquid does not contain a preservative.

[0121] A particularly preferred hydrophilic agent liquid contains 70 to 90% by weight of glycerin and 10 to 30% by weight of water. Such a hydrophilic agent liquid containing glycerin as the main component and an appropriate amount of water is not only preferred as a moisturizer when transferred to the skin, but is also preferred because the water is retained in the glycerin as bound water (glycerin has an extremely high water retention capacity) and is not easily corrupted. That is, from such a viewpoint, when using a hydrophilic agent liquid containing water, if the hydrophilic agent liquid contains a large amount of glycerin, the surface moisture content (for example, the aforementioned 3% to 10%) is sufficiently ensured, and the water activity value of the hydrophilic agent liquid is suppressed to a low level, for example, below 0.8, more preferably 0.3 to 0.7, and particularly preferably 0.3 to 0.5, then even if no preservative is contained, microbial reproduction can be suppressed, the preservation is good, and the moisturizing effect when transferred to the skin is also high.

[0122] The content of the hydrophilic agent in the agent-containing region 32 may be appropriately determined according to the purpose. For example, in the case of a hydrophilic agent containing 70 to 90 wt % of glycerol and 10 to 30 wt % of water, the content per unit area in the agent-containing region 32 is preferably 5 g / m 2 ~15g / m 2 . In Fig.12 In the case where there are a plurality of regions with different contents of the hydrophilic agent liquid as shown in 32a and 32b, or in the case where the amount of the hydrophilic agent liquid applied is continuously changed, the content of the hydrophilic agent liquid is preferably 2 g / m 2 ~20g / m 2, or the content of the hydrophilic agent is 5g / m 2 ~15g / m 2 The portion is greater than 20% of the area of ​​the agent-containing region 32, or both.

[0123] In addition, the glycerin content was measured by the following glycerin content measurement method.

[0124] (Glycerol content determination method)

[0125] Four identical products are prepared, and for any one of them, the size of the glycerin-containing region 32 is measured by the method described below to determine the area of ​​the glycerin-containing region 32 (the total area when there are a plurality of glycerin-containing regions).

[0126] Cut out the entire glycerin-containing area 32 from the top sheets 30 of four identical products (it is not necessary to cut out exactly along the edge, as long as the entire glycerin-containing area is included, and the portion around the glycerin-containing area may be slightly included) and use all of them as test pieces, or remove the top sheets 30 of four identical products and use them directly as test pieces.

[0127] ·Put the test piece in a 300ml beaker filled with water at a temperature of 25 degrees, poke or stir it repeatedly and irregularly with a glass rod for more than 1 minute, and then let it stand for 60 minutes while immersed in water. During the standing, in order to make the height of the test piece in the beaker as low as possible, fold the test piece and press it with a heavy object, or fix it in the folded state by bonding or sewing in advance. In addition, the amount of water is the minimum amount (for example, 10ml) that can immerse the entire test piece in water. After the standing, poke or stir it repeatedly and irregularly with a glass rod for more than 1 minute, then lift the test piece and squeeze it thoroughly, and use a glycerin concentration meter to measure the glycerin concentration of the glycerin-containing water remaining in the beaker. In addition, measure the weight of the glycerin-containing water remaining in the beaker. Then, based on these measurement results, the weight of glycerin contained in the glycerin-containing water is calculated.

[0128] The glycerin content (g / m2) of the glycerin-containing region 32 is calculated by dividing the glycerin weight of the water containing glycerin by a value equal to four times the area of ​​the glycerin-containing region 32 (for four parts of the product). 2 ).

[0129] As the top sheet 30, a top sheet 30 made of a hydrophobic resin fiber is preferred because of its low cost, but in this state, the retention of the hydrophilic agent liquid containing water is poor. Therefore, the hydrophilic agent liquid preferably has a viscosity of 150 mPa·s to 400 mPa·s at a temperature of 20° C. Therefore, it is preferred to improve the retention of the hydrophilic agent liquid by the top sheet 30.

[0130] As the top sheet 30, the top sheet 30 using the fiber of the hydrophobic resin is low in cost and therefore preferred, but in this state, the retention of the hydrophilic agent liquid containing water is lacking. Therefore, it is preferred to use a non-woven fabric of hydrophilic fibers obtained by coating the fiber of the hydrophobic resin with a hydrophilic agent for the top sheet 30. Therefore, it is preferred to improve the retention of the hydrophilic agent liquid by the top sheet 30.

[0131] As the hydrophilic agent, in consideration of safety to the human body, safety during the process, etc., it is preferred to use the following components alone or in mixtures thereof: nonionic surfactants such as higher alcohols, higher fatty acids, and alkylphenols to which ethylene oxide is added, anionic surfactants such as alkyl phosphates (octyl, dodecyl), and alkyl sulfates. The amount added varies depending on the required performance, but it is generally preferred to be about 0.1% to 2.0% by weight relative to the dry weight of the target sheet, and particularly preferably about 0.2% to 1.0% by weight. In addition, the hydrophilic agent can be used in the same manner for the intermediate sheet.

[0132] (Depression)

[0133] like Figure 6 to Figure 8 As shown, on the back of the top sheet 30, recessed portions 20 that are recessed toward the front side are arranged at intervals, and there is a gap between the upper surface of the recessed portion 20 and the back side component (the middle sheet 40 in the example shown in the figure). When the agent liquid containing area 32 has a portion overlapping with the recessed portion 20, the contact area between the top sheet 30 and the back side component is reduced, and the hydrophilic agent liquid given to the top sheet 30 is not easy to transfer to the back side component, and is easy to remain in the top sheet 30, which can improve the effect of the hydrophilic agent liquid given to the top sheet 30 compared with the past. In other words, the amount of hydrophilic agent liquid given can be saved while achieving the same effect.

[0134] The depth 20h of the recessed portion 20 can be appropriately determined, but is preferably 0.5 mm to 3 mm in general from the viewpoint of more reliably reducing the contact area between the top sheet 30 and the back surface side member.

[0135] The size of the liquid-containing area 32 and the size and arrangement of the recessed portions 20 can be appropriately determined, but for example, in the case where the liquid-containing area 32 has a size in the front-to-back direction LD of 30 mm or more and a size in the width direction WD of 5 mm or more, if the recessed portions 20 have a size 20q in the front-to-back direction LD of 3 mm to 8 mm and a size 20w in the width direction WD of 3 mm to 5 mm, and are arranged in the entire skin contact area of ​​the top sheet 30 at intervals in the front-to-back direction LD that are shorter than the size of the liquid-containing area 32 in the front-to-back direction LD and at intervals in the width direction WD that are shorter than the size of the liquid-containing area 32 in the width direction WD, then even if the position of the liquid-containing area 32 changes slightly due to manufacturing errors, etc., the liquid-containing area 32 can reliably have a portion overlapping with the recessed portions 20, and is therefore preferred.

[0136] In addition, if the dimension 20q of the recessed portion 20 in the front-to-back direction LD is longer than the shortest interval 20p between adjacent recessed portions 20 in the front-to-back direction LD (20q>20p), and the dimension 20w of the recessed portion 20 in the width direction WD is longer than the shortest interval 20i between adjacent recessed portions 20 in the width direction WD (20w>20i), the area ratio of the recessed portion 20 (the proportion of the area of ​​the recessed portion in each unit area of ​​the top sheet) is sufficiently higher than that of the portion other than the recessed portion 20, and the top sheet 30 has better retention of the hydrophilic agent liquid, so it is preferred.

[0137] The planar shape of the recessed portion 20 is not particularly limited, and may be any shape other than a circle as shown in the example of the figure, such as an ellipse, a triangle, a rectangle, a polygon with five or more sides, a star, or a cloud.

[0138] The planar arrangement of the recessed portions 20 is not particularly limited except for the Fig. 9 In addition to the rows and columns shown, you can also Figure 6 and Fig.10 The arrangement may be changed as appropriate, such as to be staggered as shown (staggered arrangement in adjacent columns).

[0139] In the example shown in the figure, it is assumed that the recessed portion 20 is provided in the substantially entire range of the top sheet 30, but as long as it has a portion overlapping with the liquid-containing area 32, it may be provided only in a portion of the top sheet 30. For example, when the size of the middle sheet 40 is shorter than the top sheet 30, it may be provided only in the substantially entire area where the top sheet 30 and the middle sheet 40 overlap.

[0140] As long as there is a recessed portion 20 on the back side of the top sheet 30, it can be Figure 7 As shown in FIG. 1 , the front side of the top sheet 30 does not have concavoconvexity and is flat, but in order to achieve the air permeability of the front side of the top sheet 30 and reduce the surface friction, it is preferably as shown in FIG. Figure 6 as well as Figure 8 to Figure 10As shown, the front of the top sheet 30 is formed with concavoconvex. Such concavoconvex can be formed by embossing. In particular, if embossing is used to squeeze the top sheet 30 from the back side to the front side to form the recessed portion 20 as shown in the figure example, then when the front side of the top sheet 30 is observed, the convex portion 31 is formed with the arrangement corresponding to the recessed portion 20 on the back side of the top sheet 30 (overlapping), and the convex portion 31 that is easy to contact with the skin becomes higher to the retention of the hydrophilic agent liquid, so it is preferred. In addition, when the top sheet 30 is implemented with such embossing, if the top sheet 30 is a staple nonwoven fabric as mentioned above, the recessed portion 20 and the convex portion 31 can be formed more clearly, and the retention of the hydrophilic agent liquid is improved, so it is preferred. In addition, the part between the adjacent convex portions 31, i.e. the concave portion when observed from the front side, is represented by the reference numeral 33.

[0141] As an example, preferably, Figure 6 as well as Figure 8 to Figure 10 As shown, the part between the adjacent convex parts 31 in the width direction and the front-back direction in the top sheet 30 (the part between the recessed parts 20 when viewed from the back side) is joined with the intermediate piece 40 by pressurized welding, so that a plurality of top sheet joints 82 are formed with a bonding pattern discontinuous in the width direction and the front-back direction. The top sheet joint 82 is also the part forming the bottom of the recess. And, in the bonding pattern of the top sheet 30 and the intermediate piece 40, in the region between the adjacent convex parts 31 in the MD direction, the top sheet joint 82 is arranged in a plurality of rows spaced apart in the CD direction to form the central position of the CD direction across the region, and the interval part in the CD direction of the top sheet joint 82 is formed as a compression part 83, at which the top sheet 30 and the intermediate piece 40 are not welded, and the top sheet 30 is compressed more than its MD direction both sides. Such a structure can be manufactured by the method described in patent document 3.

[0142] At the compression part 83, as long as the top sheet 30 is compressed, the middle sheet 40 can be compressed integrally with the top sheet 30 or not. In addition, at the portion outside the top sheet joint 82 and the compression part 83, it can be that the top sheet 30 and the middle sheet 40 are not welded and compressed in the same manner as the interval portion in the CD direction, but preferably, the top sheet 30 and the middle sheet 40 are not welded, and the compression of the top sheet 30 does not exceed the interval portion in the CD direction (also including the non-compressed situation that is not compressed at all). That is, when the thickness of the top sheet joint 82 of the top sheet 30 is set to T1, the thickness of the compression part 83 is set to T2, and the thickness of the portion except the top sheet joint 82 and the compression part 83 is set to T3, it can be T1<T2=T3, but preferably T1<T2<T3.

[0143] The shape of each top sheet joint 82 is not particularly limited, and may be any shape other than a circle as shown in the example of the drawings, such as an ellipse, a polygon, a star, or a cloud.

[0144] You can also Figure 7 As shown in (c), the liquid containing area 32 is provided only at the portion having the recessed portion 20 in the top sheet 30. That is, a plurality of liquid containing areas 32 may be provided corresponding to the arrangement of the recessed portions 20. Of course, although not shown in the figure, Figure 6 as well as Figure 8 to Figure 10 In the case where a convex portion 31 is provided on the front side of the top sheet 30 corresponding to the concave portion 20 on the back side of the top sheet 30 as in the example shown, a liquid-containing area 32 may be provided only at the portion of the top sheet 30 having the concave portion 20, i.e., only at the convex portion 31.

[0145] <Explanation of Terms Used in the Specification>

[0146] The following terms in the specification have the following meanings unless otherwise specified in the specification.

[0147] The “front-rear direction” refers to the direction (longitudinal direction) indicated by symbol LD in the figure, and the “width direction” refers to the direction (left-right direction) indicated by symbol WD in the figure. The front-rear direction is perpendicular to the width direction.

[0148] "MD direction" and "CD direction" refer to the conveying direction (MD direction) in the manufacturing equipment and the transverse direction (CD direction) perpendicular to the conveying direction. Depending on the part of the product, one of them becomes the front-to-back direction and the other becomes the width direction. The MD direction of the nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. Fiber orientation refers to the direction along which the fibers of the nonwoven fabric are oriented. For example, it can be determined by the following measurement methods: a measurement method according to the fiber orientation test method, wherein the fiber orientation test method is a zero-distance tensile strength test method based on TAPPI standard method T481; or a simple measurement method that determines the fiber orientation direction based on the ratio of the tensile strength in the front-to-back direction and the width direction.

[0149] The “front side” refers to the side close to the wearer's skin when worn, and the “back side” refers to the side away from the wearer's skin when worn.

[0150] The “front side” refers to the side close to the wearer's skin when worn, and the “back side” refers to the side away from the wearer's skin when worn.

[0151] "Area ratio" refers to the proportion of the target part in the unit area, and is expressed as a percentage by dividing the total area of ​​the target part (e.g., hole) in the target area (e.g., cover nonwoven fabric) by the area of ​​the target area. In a form where multiple target parts are arranged at intervals, it is preferred to set the target area to a size that includes 10 or more target parts to obtain the area ratio. For example, the area ratio of the hole can be measured using a device such as KEYENCE's trade name VHX-1000, and the measurement conditions are set to 20 times, and the following steps are followed.

[0152] (1) Set the lens to 20 times and adjust the focus. Adjust the position of the non-woven fabric so that 4×6 holes appear.

[0153] (2) Specify the brightness of the hole area and measure the hole area.

[0154] (3) Click "Measurement & Annotation" and then "Area Measurement" and then "Color Extraction". Click the hole.

[0155] (4) Click "Summarize Measurements", select "Show Measurement Results Window", and save as CSV data.

[0156] "Elongation" means a value when the natural length is 100%. For example, an elongation of 200% has the same meaning as an elongation of 2 times.

[0157] "Gel strength" was measured as follows. 1.0 g of a high absorbent polymer was added to 49.0 g of artificial urine (mixed with 2 wt% urea, 0.8 wt% sodium chloride, 0.03 wt% calcium chloride dihydrate, 0.08 wt% magnesium sulfate heptahydrate, and 97.09 wt% ion exchange water) and stirred using a stirrer. The resulting gel was placed in a constant temperature and humidity chamber at 40°C x 60% RH for 3 hours and then returned to room temperature. The gel strength was measured using a curdmeter (manufactured by I.techno Engineering: Curdmeter-MAX ME-500).

[0158] ·The "weight per unit area" is measured as follows. After pre-drying the sample or test piece, place it in a test room or device under standard conditions (the temperature of the test site is 23±1°C and the relative humidity is 50±2%) to make it a constant state. Pre-drying means making the sample or test piece a constant in an environment with a temperature of 100°C. In addition, for fibers with an official moisture regain of 0.0%, pre-drying is not required. Use a template (100mm×100mm) for sample selection to cut a sample of 100mm×100mm in size from the test piece that has become a constant state. Measure the weight of the sample and multiply it by 100 to calculate the weight per square meter as the weight per unit area.

[0159] "Thickness" is measured using an automatic thickness gauge (KES-G5 portable compression tester) at a load of 0.098 N / cm 2 , Pressurized area: 2cm 2 The thickness of the perforated nonwoven fabric is measured at the hole and the surrounding part except the protrusion.

[0160] The "water absorption" is measured according to JIS K7223-1996 "Test method for water absorption of super absorbent resin".

[0161] The “water absorption rate” is the “time to the end point” when JIS K7224-1996 “Water absorption rate test method for super absorbent polymers” is carried out using 2 g of a super absorbent polymer and 50 g of physiological saline.

[0162] The “expanded state” refers to a state in which the device is not contracted (including all contractions due to contraction of elastic members) or is relaxed and flatly expanded.

[0163] ・ Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not the natural length state.

[0164] "Melt viscosity" is measured at a predetermined temperature using a Brookfield B-type viscometer (spindle No. 027) in accordance with JIS Z 8803.

[0165] The "maximum dimension" of a hole refers to the longer dimension between the dimension in the MD direction and the dimension in the CD direction.

[0166] "Average friction coefficient MIU" and "variation deviation of average friction coefficient MMD" refer to the values ​​of the sensor moving distance 20 mm measured using the friction measurement instrument KES-SE (10 mm square silicone sensor, load 50 g) manufactured by KATO Tech Co., Ltd. The moving direction (friction direction) of the sensor is the MD direction of the top sheet. When measuring the product, the parts other than the top sheet in the product are removed or cut off within the range that does not affect the friction test on the front side of the top sheet (so, for example, the parts welded to the top sheet are not removed), and the test is carried out in the unfolded state.

[0167] In addition, when the size of the area containing the agent in the top sheet in the CD direction is smaller than the size of the sensor (10 mm), Fig.13 As shown in (a), the top sheet 30 is cut along the side edge of the liquid containing area 32 to make a sample 300 (narrower in width than the sensor 100) containing only the liquid containing area 32. For this sample, Fig.13As shown in (b), the center of the sensor 100 is aligned with the center of the CD direction of the sample 300 and the measurement is performed. In each measurement, the hydrophilic agent liquid adhering to the surface of the sensor 100 is fully wiped off before the next measurement.

[0168] In addition, in the case where the area containing liquid cannot be determined visually, the area containing liquid can be determined by an appropriate method. For example, it can be that a required number of samples (for measurement and position determination) of the same position of the area containing liquid 32 are prepared, and the area containing liquid 32 in the top sheet 30 of the sample for position determination is colored with a color different from the surrounding color using an appropriate colorant, and the coloring position is determined using a ruler or an appropriate image measurement device, and then the position in the sample for measurement that is the same as the coloring position determined using the position determination sample is measured as the area containing liquid 32. As a substance that can color the area 32 containing hydrophilic liquid, a water-leaking color developing agent (モレミールW) of TASETO Co., Ltd. can be appropriately used. When measuring the size 32L in the MD direction and the size 32W in the CD direction of the area containing liquid 32, and when measuring the surface moisture content described later, the area containing liquid 32 can also be determined by this method.

[0169] The "surface moisture content" is the average value obtained by measuring and calculating any three locations of the agent-containing region 32 using a moisture meter (MY-808S) manufactured by Scalar. In addition, each time the hydrophilic agent attached to the measuring surface of the moisture meter is fully wiped off before the next measurement.

[0170] ·The "water activity value" can be measured using a resistive water activity measuring device such as EZ-100ST (resistive type) manufactured by Furento Sangyo Co., Ltd. Before the measurement, a saturated solution is used for calibration. The measurement can be performed according to the resistive test based on the food hygiene inspection guidelines. That is, a sample with a volume of more than 3% of the volume of the space inside the detector of the water activity measuring device is collected, placed on an aluminum foil plate or an open flat plate, and immediately placed in the detector for sealing, placed at 25±2 degrees, and the value is read at intervals of 10 minutes. The moment when the change in the value is no longer observed is regarded as the water vapor pressure in the detector being in a state of equilibrium, and the value at that moment is used as the measured value of the sample. Each sample is measured 3 times, and the average of the 3 measured values ​​is used as the water activity value.

[0171] "Viscosity" is measured at a predetermined temperature using a Brookfield B-type viscometer (spindle No. 027) in accordance with JIS Z 8803.

[0172] In the absence of any description of the environmental conditions for a test or measurement, the test or measurement was conducted in a test room or device under standard conditions (temperature at the test site was 23±1°C and relative humidity was 50±2%).

[0173] Industrial Applicability

[0174] The present invention can be applied to all disposable wearing articles such as pants-type disposable diapers and belt-type disposable diapers, pad-type disposable diapers, disposable swimsuits, diaper covers, and sanitary napkins.

[0175] Description of symbols

[0176] 11: liquid-impermeable sheet; 12: outer nonwoven fabric; 20: recessed portion; 30: top sheet; 40: middle sheet; 50: absorbent member; 56: absorbent body; 58: packaging sheet; 60: standing pleats; 62: pleated sheet; LD: front-to-back direction; WD: width direction; 29: hydrophobic hot-melt adhesive; 31: convex portion; 32: liquid-containing area.

Claims

1. A disposable wearing article, characterized in that: The disposable wearing article has: a topsheet comprising a skin contacting area that contacts the wearer's skin; and a back side member adjacent to the back side of the top sheet, The top sheet is a liquid-permeable nonwoven fabric. The skin contact area has a liquid containing area containing a hydrophilic liquid, wherein the hydrophilic liquid contains water. On the back side of the top sheet, recessed portions that are recessed toward the front side are arranged at intervals, while the front side of the top sheet is flat. There is a gap between the upper surface of the recessed portion and the back side component. The liquid-containing region has a portion overlapping with the recessed portion, The liquid-containing region has a dimension of 30 mm or more in the front-to-back direction and a dimension of 5 mm or more in the width direction, The recessed portions have a front-to-back dimension of 3 mm to 8 mm and a width dimension of 3 mm to 5 mm, and are arranged in the entire skin contacting region of the top sheet at a front-to-back interval shorter than the front-to-back dimension of the agent liquid containing region and at a width interval shorter than the width dimension of the agent liquid containing region. The dimension of the recessed portion in the front-to-back direction is longer than the shortest interval between the recessed portions adjacent to each other in the front-to-back direction. A dimension of the recessed portion in a width direction is longer than a shortest interval between the recessed portions adjacent to each other in the width direction.

2. The disposable wearing article according to claim 1, wherein: The liquid-containing regions are arranged in a longitudinal stripe shape, and the interval between adjacent liquid-containing regions is 1.5 mm to 10 mm.

3. The disposable wearing article according to claim 1 or 2, wherein: The top sheet has a fineness of 1 dtex to 3 dtex and a weight per unit area of ​​10 g / m 2 ~30g / m 2 The short fiber nonwoven fabric has a thickness of 0.4 mm to 1.4 mm.

4. The disposable wearing article according to claim 1 or 2, wherein: The depth of the recessed portion is 0.5 mm to 3 mm.

5. The disposable wearing article according to claim 1 or 2, wherein: The hydrophilic agent liquid contains 70 wt% to 90 wt% of glycerol and 10 wt% to 30 wt% of water. In the liquid-containing region, the content of the hydrophilic liquid per unit area is 5 g / m 2 ~15g / m 2 , The viscosity of the hydrophilic agent liquid at a temperature of 20 degrees is 150 mPa·s to 400 mPa·s.

6. The disposable wearing article according to claim 2, wherein: The top sheet is integrally bonded to the back side member by means of a hydrophobic hot melt adhesive. The coating amount of the hydrophobic hot melt adhesive is 0.5 g / m 2 ~5g / m 2 .

7. The disposable wearing article according to claim 1 or 2, wherein: The nonwoven fabric is a nonwoven fabric of hydrophilic fibers obtained by coating hydrophilic agent on hydrophobic resin fibers.

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