JP2016112155A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which increases a texture such as softness to give cushioning properties and suppresses an uncomfortable sticky feeling.SOLUTION: An absorbent article 1 is equipped with a surface sheet 2 formed of a non-woven fabric including a non-thermal adhesive hydrophilic fiber of 50% or more. The surface sheet 2 is formed into an uneven structure in which a projecting strip part 21 and a recessed strip part 22 of a streaky shape that extend in a vertical direction are arranged alternately in a width direction. Fiber density in an intermediate part region 23c of the projecting strip part 21 is lower than fiber density of a top part region 23a and of a bottom part region 23b.SELECTED DRAWING: Figure 3

Description

  The present invention relates to absorbent articles such as sanitary napkins and disposable diapers.

  As a surface sheet of an absorbent article, a spunlace nonwoven fabric formed by entanglement of fibers with a high-pressure water stream is used. A general spunlace nonwoven fabric used for absorbent articles is moderately strong and soft, but thin and inferior in cushioning properties.

  Patent Document 1 discloses an absorbent article in which unevenness shaping is applied to a spunlace nonwoven fabric having hydrophilic fibers and the surface sheet is used from the viewpoint of improving the texture such as softness and imparting cushioning properties. Has been.

JP 2003-339761 A

  However, in general, a surface sheet made of hydrophilic fibers easily retains body fluids, so that the liquid diffusion rate is increased, while the liquid diffusion area is widened, the contact area with the skin facing surface is widened, and uncomfortable. The tactile feeling will improve. Patent Document 1 does not describe anything from the viewpoint of reducing the liquid diffusion area, reducing the contact area between the skin facing surface and the wearer, and suppressing an unpleasant sticky feeling.

  Therefore, the subject of this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.

  The present invention is an absorbent article that includes a liquid-permeable surface sheet that forms a skin-facing surface, and has a longitudinal direction corresponding to a wearer's front-rear direction and a width direction perpendicular to the longitudinal direction. Is formed of a non-woven fabric containing 50% by mass or more of non-heat-bondable hydrophilic fibers, and the topsheet has irregularities in which strip-like ridges and ridges extending in the vertical direction are alternately arranged in the width direction. The intermediate region between the top region of the convex portion and the bottom region of the concave portion has a density lower than the density of the top region and the density of the bottom region. An absorbent article is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article with which the unpleasant sticky feeling was suppressed is provided.

FIG. 1 is a perspective view showing a panty liner according to an embodiment of the present invention. 2 is an enlarged sectional view taken along line II-II in FIG. FIG. 3 is a partially broken perspective view showing an enlarged main part on the skin facing surface side in the panty liner shown in FIG. 1. FIG. 4 is an enlarged cross-sectional view of a main part of the topsheet provided in the panty liner shown in FIG. FIG. 5 is a schematic diagram showing a manufacturing apparatus suitably used for manufacturing a top sheet provided in the panty liner shown in FIG. 6 is a cross-sectional view taken along line VI-VI shown in FIG. FIG. 7 is a perspective view showing a panty liner according to another embodiment of the present invention. FIG. 8 is a partially broken perspective view showing an enlarged main part on the skin facing surface side in the panty liner shown in FIG. 7. FIG. 9 is a schematic view showing a manufacturing apparatus suitably used for manufacturing a top sheet provided in the panty liner shown in FIG. 10A is a cross-sectional view taken along line XX shown in FIG. 9, and FIG. 10B is a cross-sectional view showing a state where the pair of concave and convex rolls shown in FIG. 10A is rotated in the circumferential direction. is there. FIG. 11 is a perspective view showing a panty liner which is still another embodiment of the present invention. FIG. 12 is a partially broken perspective view showing an enlarged main part on the skin facing surface side in the panty liner shown in FIG. 11. FIG. 13 is a schematic view showing a manufacturing apparatus suitably used for manufacturing a top sheet provided in the panty liner shown in FIG. 14 is a cross-sectional view taken along line XIV-XIV shown in FIG.

The present invention will be described below based on preferred embodiments with reference to the drawings.
FIG. 1 is a perspective view of a panty liner 1 (hereinafter also simply referred to as “panty liner 1”) according to an embodiment of the present invention. 2 is an enlarged sectional view taken along line II-II in FIG.

  As shown in FIGS. 1 and 2, the panty liner 1 includes a liquid-permeable surface sheet 2 that forms a skin facing surface. The panty liner 1 has a vertically long shape, and has a vertical direction and a width direction. In FIG. 1, the vertical direction and the width direction are shown as an X direction and a Y direction, respectively. The vertical direction coincides with the wearer's front-rear direction when the panty liner 1 is worn, and the width direction is a direction orthogonal to the vertical direction in the plan view of the panty liner 1. Moreover, the thickness direction of the panty liner 1 will be described as the Z direction.

  Specifically, as shown in FIGS. 1 and 2, the panty liner 1 includes a top sheet 2, a liquid-impermeable back sheet 3, and an absorbent body 4 interposed between both the sheets 2 and 3, A liquid-permeable second sheet 5 is provided between the top sheet 2 and the absorber 4. The panty liner 1 has an oval shape in plan view in which a central portion in the vertical direction is constricted. Here, the liquid impermeability of the back sheet 3 is meant to include poor liquid permeability.

  As shown in FIG.1 and FIG.2, in the panty liner 1, the rectangular-shaped absorber 4 long in the same direction as the front-back direction at the time of wear, and the second sheet | seat 5 which coat | covers the skin opposing surface whole region of the absorber 4. I have. As shown in FIGS. 1 and 2, the top sheet 2 covers the entire skin facing surface of the second sheet 5. The top sheet 2 and the second sheet 5 have portions extending outward from both ends and both sides in the longitudinal direction of the absorbent body 4. The back sheet 3 covers the entire non-skin facing surface of the absorbent body 4 and has portions extending outward from both longitudinal ends and both sides of the absorbent body 4. The top sheet 2, the second sheet 5, and the back sheet 3 are fused (heat-embossed, super-extruded) at the peripheral portion 7 of the panty liner 1, extending outward from both ends and both sides in the longitudinal direction of the absorber 4. They are fixed to each other by sonic embossing, high-frequency embossing) or an adhesive. Thus, the rectangular absorber 4 is sandwiched between the second sheet 5 and the back sheet 3. A non-skin facing surface of the back sheet 3 of the panty liner 1 is provided with an adhesive portion (not shown) for fixing to underwear such as shorts.

  The top sheet 2 is formed of a nonwoven fabric containing 50% by mass or more of non-heat-bondable hydrophilic fibers. Here, the “non-heat-sealable” fiber means a fiber that does not melt even when heated and does not heat-seal. “Hydrophilic fiber” refers to a fiber that can retain moisture, and does not include a surface of a hydrophobic fiber treated with a hydrophilizing agent. The ratio of the non-heat-bondable hydrophilic fibers to the entire fibers constituting the surface sheet 2 is 50% by mass or more, and is 50% by mass or more from the viewpoint of the touch and the ability to absorb a small amount of sag. Preferably, it is 60 mass% or more.

  As the non-heat-fusible hydrophilic fiber, natural fiber, regenerated cellulose fiber, semi-synthetic fiber, or the like can be used. Examples of natural fibers include cotton fibers, silk fibers, or lyocell that is a purified cellulose fiber. Examples of the regenerated cellulose fiber include regenerated fibers such as rayon fiber and cupra fiber, and examples of the semisynthetic fiber include acetate. From the viewpoint of touch and texture, it is preferable to use cotton fibers or lyocell, which are natural fibers, as the non-heat-bondable hydrophilic fibers.

  The surface sheet 2 containing 50% by mass or more of non-heat-bondable hydrophilic fibers is manufactured by a spunlace method (water-entanglement method) in which fibers are entangled with each other by a high-pressure water flow rather than a method of heat-bonding the fibers. Is preferred.

  As described above, the constituent fibers of the top sheet 2 may be configured to include other fibers in addition to the non-heat-bondable hydrophilic fibers, but are configured only from the non-heat-bondable hydrophilic fibers. It is preferable from the viewpoint of touch. Examples of other fibers that can be included in the constituent fibers of the surface sheet 2 include heat-sealable synthetic fibers such as core-sheath type polyethylene-polypropylene composite fibers, core-sheath type polyethylene-polyethylene terephthalate composite fibers, and polyethylene terephthalate single fibers. Is mentioned.

The nonwoven fabric which comprises the surface sheet 2 is demonstrated in detail.
FIG. 3 shows a perspective view of the panty liner 1 of the present embodiment in a state where the top sheet 2 and the second sheet 5 that is the lower layer side member are in contact with each other. FIG. 4 is a schematic diagram showing a cross section in the thickness direction of the topsheet 2 shown in FIG.

  As shown in FIGS. 1 and 2, the topsheet 2 is formed in a concavo-convex structure in which streaky ridges 21 and ridges 22 extending in the vertical direction are alternately arranged in the width direction. Specifically, as shown in FIG. 3 and FIG. 4, the top sheet 2 has a plurality of ridges 21 in which the cross-sectional shapes of the front surface u and the back surface d both protrude upward in the thickness direction, It has the concave line part 22 located between adjacent convex line parts 21 and 21. FIG. As for the concave part 22, the cross-sectional shape of front and back both surfaces u and d has comprised the concave shape toward the upper direction of the thickness direction of a nonwoven fabric. In other words, as for the concave strip part 22, the cross-sectional shape of both front and back both surfaces u and d is convex toward the lower side in the thickness direction (Z direction) of the nonwoven fabric. Each of the plurality of ridges 21 extends continuously in the vertical direction of the panty liner 1, and each of the plurality of ridges 22 also has a groove shape extending continuously in the vertical direction of the panty liner 1. Yes. The ridges 21 and the ridges 22 are parallel to each other and are alternately arranged in the width direction.

  As shown in FIG. 4, the topsheet 2 is located in the top region 23 a of the ridge portion 21, the bottom region 23 b of the recess portion 22, and between these when the topsheet 2 is viewed in cross section along the thickness direction. And an intermediate area 23c. The top area 23 a, the bottom area 23 b, and the intermediate area 23 c extend continuously in the longitudinal direction of the panty liner 1. The top region 23a of the ridge portion 21, the bottom region 23b and the intermediate region 23c of the ridge portion 22, when the surface sheet 2 is viewed in cross section along the thickness direction, the thickness in the Z direction of the surface sheet 2 is divided into three equal parts. Then, the upper region in the thickness direction is distinguished as the top region 23a, the central region as the middle region 23c, and the lower region as the bottom region 23b.

  Moreover, as shown in FIGS. 2-4, the surface sheet 2 is contacting in the bottom region 23b of the concave part 22 and the lower layer side member distribute | arranged to the non-skin opposing surface side. In the panty liner 1, the second sheet 5 corresponds to the lower layer side member. The top sheet 2 is bonded and fixed to the second sheet 5 via the adhesive 6 at the bottom region 23 b of the concave strip 22. The top sheet 2 having the ridges 21 forms a hollow structure with the second sheet 5. It is preferable that the surface sheet 2 constitutes the surface sheet 2 and does not have a heat fusion point between constituent fibers, except for the bottom region 23b of the concave portion 22 that contacts the second sheet 5 that is the lower layer side member. It is further preferable that the bottom region 23b of the concave portion 22 does not have the heat fusion point. That is, it is preferable that the surface sheet 2 as a whole does not have the thermal fusion point between the constituent fibers constituting the surface sheet 2.

  As shown in FIG. 4, when the topsheet 2 is observed along the thickness direction, the fiber density of the intermediate region 23c is lower than the fiber density of the top region 23a and the fiber density of the bottom region 23b. In addition, since the surface sheet 2 is formed of a non-woven fabric containing 50% by mass or more of non-heat-bondable hydrophilic fibers, the fineness of the top region 23a is determined in the panty liner 1 for the reason described in the manufacturing method described later. The fineness of the bottom area 23b and the fineness of the intermediate area 23c are formed to the same fineness.

Fiber density in the top zone _{23a (D} 23a), and the ratio of the fiber density of the intermediate portion region 23c _{(D 23c)} against the fiber density _{(D 23b)} at the bottom area _{23b (D 23c / D 23a,} D 23c / D 23b ) Is preferably 0.3 or more and 0.95 or less, and more preferably 0.4 or more and 0.7 or less.
It respect to specific values of the fiber density of the surface sheet 2, the fiber density of the intermediate portion region 23c _{(D 23c),} it is preferable, 0.1 g / cm ³ or more and 0.005 g / cm ³ or more but more preferably, and is preferably at 0.1 g / cm ³ or less, preferably specifically at most 0.005 g / cm ³ or more ^{0.1g / cm 3, 0.01g / cm} 3 or more More preferably, it is 0.1 g / cm ³ or less.
The fiber density in the fiber density _{(D 23a),} and a bottom zone 23b at the top region 23a _{(D 23b),} it is preferably, 0.1 g / cm ³ or more that is 0.05 g / cm ³ or more More preferably, it is preferably 0.5 g / cm ³ or less, more preferably 0.2 g / cm ³ or less, specifically 0.005 g / cm ³ or more and 0.2 g / cm ³ or less. It is preferably ³ or less, and more preferably 0.1 g / cm ³ or more and 0.2 g / cm ³ or less.
Fiber density of the entire surface sheet 2 is preferably 0.01 g / cm ³ or more, further preferably 0.05 g / cm ³ or more, and is preferably at 0.05 g / cm ³ or less , further preferably 0.2 g / cm ³ or less, preferably specifically is 0.01 g / cm ³ or more 0.5 g / cm ³ or less, 0.05 g / cm ³ or more 0.2 g / More preferably, it is not more than cm ³ .
The fiber density of each part is determined by the measurement method shown below.

The basis weight of the intermediate area 23c is preferably 5 g / m ² or more, more preferably 10 g / m ² or more, and preferably 30 g / m ² or less, 25 g / m ² or less. More specifically, it is preferably 5 g / m ² or more and 30 g / m ² or less, more preferably 10 g / m ² or more and 25 g / m ² or less.
Further, the basis weight at the top region 23a and the basis weight at the bottom region 23b are preferably 10 g / m ² or more, more preferably 20 g / m ² or more, and 40 g / m ² or less. It is preferably 35 g / m ² or less, more preferably 10 g / m ² or more and 40 g / m ² or less, and more preferably 20 g / m ² or more and 35 g / m ² or less. More preferably.
The basis weight of the entire surface sheet 2 is preferably 5 g / m ² or more, more preferably 10 g / m ² or more, and preferably 40 g / m ² or less, and 30 g / m ² or less. More specifically, it is preferably 5 g / m ² or more and 40 g / m ² or less, more preferably 10 g / m ² or more and 30 g / m ² or less.
The basis weight of each part is determined by the measurement method shown below.

<Measuring method of basis weight of intermediate area 23c>
A cut sample is cut out from the panty liner 1 in an unloaded state by cutting into a rectangular shape having a predetermined length A in the vertical direction and a predetermined length B in the width direction without peeling off the topsheet 2. Next, in the cut sample, the cut section in the width direction is observed, and the longitudinal width C (the length in the Y direction) of the top region 23a at a position where the thickness in the Z direction of the topsheet 2 is divided into three equal parts. Or the width C ′ (the length in the Y direction) of the bottom region 23b is measured, and the total value F of the width C and the width C ′ in the width direction length B of the sample is obtained. Next, only the top sheet 2 is peeled off from the cut sample so that the uneven structure is not crushed, and the weight (W) of the peeled top sheet 2 is measured. From the above results, the real basis weight (E) of the topsheet 2 is determined by the following formula (1).
Real basis weight E = W / (A × B) (1) of the surface sheet

Next, the peeled surface sheet 2 is stretched until there is no uneven structure in the width direction (Y direction), and the length (G) in the width direction (Y direction) after stretching is measured. Then, the total width (H) of the intermediate area 23c is obtained by the following equation (2).
Total width of intermediate area 23c (H) = GF (2)

Moreover, the basic weight (I) of the surface sheet 2 after extending | stretching to the width direction (Y direction) is calculated | required by the following formula | equation (3). This determined basis weight (I) is the basis weight of the entire topsheet 2.
Basis weight of surface sheet 2 after stretching (I) = W / (A × G) (3)

And the basic weight (J) of the intermediate | middle area 23c is calculated | required by the following formula | equation (4).

Basis weight (J) of intermediate area 23c
= ((W-I) * A * F) / (A * H) (4)

<Measuring method of fiber density of intermediate region 23c>
Regarding the fiber density (D _23c ) of the intermediate region 23c, in the cut sample cut out above, the cut section in the width direction (Y direction) is observed, and the central region in which the thickness in the Z direction of the topsheet 2 is divided into three equal parts. The thickness (K) is measured using an image analyzer. The measurement is performed under no load. As an image analysis apparatus, for example, a digital microscope (model number VHX-1000) manufactured by Keyence Corporation can be used. And the fiber density (K) of the intermediate | middle area 23c is calculated | required by the following formula | equation (5).
Fiber density (D _23c ) of intermediate region 23c = J / K (5)

<Measurement Method of Basis Weight at Top Area 23a and Basis Weight at Bottom Area 23b>
Moreover, the basic weight (L) in the top area | region 23a and the basic weight (L) in the bottom area 23b are calculated | required by the following formula | equation (6).
Basis weight (L) at the top area 23a (bottom area 23b)
= (W / (A × F)) / 2 (6)

<Measuring method of fiber density in top region 23a and fiber density in bottom region 23b>
Incidentally, the fiber density _{(D 23a,} D _23b) of the top zone 23a (the bottom area 23b) with respect to, in the cut sample cut as described above, by observing the cut cross section in the width direction (Y-direction), Z direction of the surface sheet 2 The thickness (M) of the top area 23a of the ridge 21 or the bottom area 23b of the ridge 22 obtained by dividing the thickness of the ridge into three parts is measured using an image analysis device. The measurement is performed under no load. As the image analysis apparatus, for example, a scanning electron microscope (model number JCM-5100) manufactured by JEOL Ltd. can be used. And the fiber density ( _D23a , _D23b ) of the top region 23a (bottom region 23b) is _{calculated |} required by the following formula | equation (7).
Fiber density (D _23a , D _23b ) of the top region 23a (bottom region _23b )
= L / M (7)

  Moreover, regarding the fiber density of the entire surface sheet 2, in the cut sample cut out as described above, the cut section in the width direction is observed, the thickness of the surface sheet 2 is randomly measured using the image analysis device, and the average thickness ( N) is calculated. And the basic weight (I) of the whole surface sheet 2 calculated | required by said Formula (3) is remove | divided by average thickness (N), and the fiber density of the whole surface sheet 2 is calculated | required.

  When the surface sheet 2 is viewed in plan, the pitch between the tops of the protruding ridges 21 adjacent in the width direction is preferably 0.5 mm or more and 5 mm or less, and more preferably 1 mm or more and 3 mm or less. The height h (see FIG. 3) of the ridges 21 is preferably 0.5 mm or more and 5 mm or less, and more preferably 1 mm or more and 2 mm or less. The height h is measured under a no load by observing a cross section in the thickness direction of the top sheet 2 with a microscope.

As described above, the top sheet 2 is bonded and fixed on the skin-facing surface of the rectangular second sheet 5 via the adhesive 6 in the bottom region 23 b of the recess 22.
As the second sheet 5, non-woven fabrics obtained by various manufacturing methods can be used. For example, an airlaid nonwoven fabric in which the fiber webs obtained by the card method or the airlaid method are used to form heat-bonding points between the fibers by the air-through method, and a fiber web obtained by the card method is used to form the heat-bonding points between the fibers by the heat roll method. Various nonwoven fabrics such as heat roll nonwoven fabric, heat embossed nonwoven fabric, spunlace nonwoven fabric, needle punched nonwoven fabric, and resin bonded nonwoven fabric can be used, and pulp airlaid nonwoven fabric is preferably used from the viewpoint of absorbability.

  The top sheet 2 and the second sheet 5 are fixed by heat sealing when the top sheet 2 includes heat-sealable fibers as other fibers in addition to the non-heat-sealable hydrophilic fibers. However, the panty liner 1 is bonded and fixed using an adhesive 6. When fixing using the adhesive 6, the adhesive 6 is applied to a portion corresponding to the bottom region 23 b of the concave portion 22 in the second sheet 5 using a known means, for example, a slot coat gun. The top sheet 2 and the second sheet 5 are fixed by applying them spirally using a spiral spray gun or applying them in a mist form using a spray gun. As the adhesive 6 to be applied, for example, a hot melt adhesive is preferably used.

Examples of the hot melt adhesive include styrene and olefin. Styrene-based hot melt adhesives include styrene-butadiene-styrene copolymer (SBS), styrene-isoprene-styrene copolymer (SIS), and styrene-ethylene-butylene-styrene copolymer, which is a hydrogenated product of SBS. (SEBS) and blended hot-melt adhesives obtained by blending two or more of these can be used. Among these, from the viewpoint of easily balancing the tack force and the cohesive force, a blended hot-melt adhesive of SIS and SBS or a blended hot-melt adhesive of SIS and SEBS is preferably used. The application amount of the hot melt adhesive is preferably 3 g / m ² or more and 10 g / m ² or less.

  In the panty liner 1, the absorbent body 4 is composed of an absorbent sheet. Specifically, the absorbent body 4 of the panty liner 1 can be used by cutting a single absorbent sheet into a predetermined shape, and can be used as a multilayer sheet by laminating a plurality of absorbent sheets. A multilayer sheet formed by folding a single absorbent sheet can also be used as the absorbent sheet. In the absorbent article of the present invention, an absorbent body, which is usually used for absorbent articles such as sanitary napkins, is coated with tissue paper on an absorbent core composed of absorbent polymer particles and fiber material. It can also be used.

  As an absorbent sheet, it is possible to bond between constituent fibers or between constituent fibers and the water-absorbing polymer through adhesive force generated in the water-absorbing polymer in a wet state or a binder such as an adhesive or adhesive fiber added separately. A sheet or the like can be preferably used. Further, as an absorbent sheet, an absorbent sheet manufactured by the method described in JP-A-8-246395, a pulverized pulp supplied in an air stream, and a water-absorbing polymer are deposited, and then an adhesive (for example, vinyl acetate) is deposited. -Based adhesive, PVA, etc.) dry sheet, absorbent sheet obtained by spraying superabsorbent polymer after applying hot melt adhesive between paper and nonwoven fabric, pulp airlaid nonwoven fabric, spunbond It is also possible to use an absorbent sheet or the like obtained by blending a highly water-absorbing polymer during the nonwoven fabric or melt blown nonwoven fabric manufacturing process. In particular, from the viewpoint of absorbability such as liquid return to the surface of the panty liner 1, an absorbent sheet obtained by blending a superabsorbent polymer during the air-laid nonwoven fabric production process mainly comprising pulp fibers is preferably used. .

The thickness of the absorber 4 is preferably 0.1 mm or greater and 1.0 mm or less, and more preferably 0.2 mm or greater and 0.8 mm or less. The thickness of the absorber 4 is measured by the following method.
The thickness T is measured using a peacock precision measuring instrument (model R1-C) which is a micrometer having two parallel pressing surfaces (a fixed pressing surface and a movable pressing surface). The diameter of the measuring element movable pressing surface is 5 mm, and the pressure is 100 kPa or less. The size of the test specimen for measurement is not less than the size of the following plate. A 20 mm × 20 mm plate (mass 5.4 g) is placed on the test piece, the measuring element movable pressurizing surface is operated at a speed of 2 mm / s, applied to the plate, and the value immediately after stabilization is read. The pressure between the pressing surfaces (pressure applied to the test piece) is 1.3 kPa or less.

  As a material for forming the back sheet 3 of the panty liner 1, various materials conventionally used for the back sheet of the absorbent article can be used without particular limitation, for example, a liquid-impermeable or water-repellent resin film. A laminate sheet of a resin film and a non-woven fabric can be used.

  In the panty liner 1 of the present embodiment, the nonwoven fabric having a concavo-convex structure used as the top sheet 2 is a nonwoven fabric comprising a stretching step in which a nonwoven fabric containing 50% by mass or more of non-heat-bondable hydrophilic fibers is stretched in one direction. It is suitably manufactured by the method. One embodiment of a method for producing a nonwoven fabric having a concavo-convex structure used as the surface sheet 2 will be described with reference to FIG. FIG. 5 schematically shows a preferable manufacturing apparatus 100 used in the method for manufacturing the topsheet 2. The manufacturing apparatus 100 is suitably used for manufacturing an air-through nonwoven fabric. The manufacturing apparatus 100 includes a stretching unit 8.

  As shown in FIG. 5, the extending portion 8 includes a pair of concave and convex rolls 81 and 82 that can be engaged with each other. The pair of concavo-convex rolls 81 and 82 is formed so as to be heatable, and is formed by alternately arranging large-diameter convex portions 83 and 84 and small-diameter spacers 85 and 86 in the roll axis direction. The concavo-convex rolls 81 and 82 are formed to be heatable, but may or may not be heated.

  Moreover, in the manufacturing apparatus 100, as shown in FIG. 6, the space | interval (pitch) of the large diameter convex parts 83 and 83 adjacent to the roll axial direction of one uneven | corrugated roll 81, and the roll axis | shaft of the other uneven | corrugated roll 82 are shown. The interval (pitch) between the large-diameter convex portions 84 and 84 adjacent to each other in the direction is the same interval (pitch) w, and the interval (pitch) w is preferably 0 from the viewpoint of texture, cushion feeling, and absorbability. It is 5 mm or more and 5 mm or less, and particularly preferably 1 mm or more and 3 mm or less. From the same viewpoint, as shown in FIG. 6, the pushing amount t of the pair of concavo-convex rolls 81 and 82 (the distance between the apex of the large-diameter convex portion 83 and the apex of the large-diameter convex portion 84 adjacent in the roll axis direction) is The thickness is preferably 0.5 mm or more and 5 mm or less, and particularly preferably 1 mm or more and 2 mm or less. From the same viewpoint, the mechanical stretching ratio is preferably greater than 1 and 5 or less, and particularly preferably 2 or more and 4 or less.

The manufacturing method of the surface sheet 2 using the manufacturing apparatus 100 having the above configuration will be described.
First, as shown in FIG. 5, a raw material nonwoven fabric 2a containing 50% by mass or more of non-heat-bondable hydrophilic fibers is prepared. And the longitudinal direction of the raw material nonwoven fabric 2a is made to correspond with the machine direction (MD, flow direction) at the time of manufacturing the surface sheet 2 using the manufacturing apparatus 100. FIG. In other words, the width direction of the raw material nonwoven fabric 2a is made to coincide with the same direction as the orthogonal direction (CD, roll axis direction) orthogonal to the machine direction (MD, flow direction). Next, as shown in FIG. 5, the raw material nonwoven fabric 2a is conveyed between a pair of concave and convex rolls 81 and 82, and as shown in FIG. 6, the raw material nonwoven fabric 2a is stretched in the width direction (Y direction). Here, since the raw material nonwoven fabric 2a is formed to include 50% by mass or more of non-heat-bondable hydrophilic fibers, and there is almost no heat-bonding portion between the constituent fibers, the large-diameter protrusion of one of the uneven rolls 81 is provided. The arrangement | positioning of the constituent fiber which comprises the raw material nonwoven fabric 2a in the part extended | stretched between the top part of the part 83 and the top part of the large diameter convex part 84 of the other uneven | corrugated roll 82 shifts | deviates. Thus, the part where arrangement | positioning of the structure fiber shifted | deviated becomes the intermediate part area 23c of the surface sheet 2 which has an uneven structure. Moreover, in the position of the top part of the large diameter convex part 83 of one uneven | corrugated roll 81, the part which is not extended | stretched becomes the bottom part area | region 23b of the concave part 22 of the surface sheet 2 which has an uneven structure. Moreover, the part which is not extended | stretched in the position of the top part of the large diameter convex part 84 of the other uneven | corrugated roll 82 becomes the top part area | region 23a of the protruding item | line part 21 of the surface sheet 2 which has an uneven structure.

  Accordingly, in the manufactured topsheet 2, the fiber density of the intermediate region 23 c is lower than the fiber density of the top region 23 a of the ridge portion 21 and the fiber density of the bottom region 23 b of the ridge portion 22. Further, as described above, since the raw nonwoven fabric 2a is formed to include 50% or more of non-heat-bondable hydrophilic fibers, the top of the large-diameter convex portion 83 of one concave-convex roll 81 and the other concave-convex roll 82. In the portion extended between the tops of the large-diameter convex portions 84, the fiber diameters of the constituent fibers constituting the raw material nonwoven fabric 2a are not easily reduced, and the arrangement is merely shifted. Therefore, the fineness of the top area 23a, the fineness of the bottom area 23b, and the fineness of the intermediate area 23c are the same. In order to further ensure this effect, it is preferable that the raw nonwoven fabric 2a has an unstretched fiber content of 10% by mass or less, and particularly does not include unstretched fibers. Similarly, as the raw material nonwoven fabric 2a, the content of the non-heat-fusible fiber is preferably 50% by mass or more and 100% by mass or less, and more preferably 60% by mass or more and 80% by mass or less.

  The topsheet 2 manufactured as described above is conveyed downstream by the pair of concave and convex rolls 81 and 82 while being deformed into a concave and convex shape. Then, the top sheet 2 is fixed to the second sheet 5 to which the adhesive 6 is applied at a position corresponding to the bottom region 23 b of the concave portion 22 of the top sheet 2 via the adhesive 6. Thereafter, the panty liner 1 is manufactured by introducing the panty liner 1 into a production line.

  In the panty liner 1 manufactured as described above, as shown in FIG. 1, the topsheet 2 is formed of a nonwoven fabric containing 50% by mass or more of non-heat-bondable hydrophilic fibers. Because there are few landing points, the texture such as softness is improved. Moreover, since the surface sheet 2 of the panty liner 1 is formed in a concavo-convex structure in which streaky ridges 21 and ridges 22 extending in the vertical direction are alternately arranged in the width direction, cushioning properties are improved. . Further, in the topsheet 2 of the panty liner 1, the fiber density of the intermediate region 23 c is lower than the fiber density of the top region 23 a of the ridge 21 and the fiber density of the bottom region 23 b of the ridge 22. Since the intermediate region 23c having such a low fiber density is included, it is easy to absorb body fluid such as menstrual blood from the intermediate region 23c. Since such an intermediate region 23c extends in the vertical direction and is intermittently arranged in the width direction, it is difficult for the body fluid to spread in the width direction of the panty liner 1, and the diffusion area of the body fluid can be suppressed, which is uncomfortable. A feeling of tapping is suppressed. In addition, the bodily fluid absorbed from the intermediate region 23c easily moves to the bottom region 23b of the concave portion 22 having a high fiber density due to gravity and density gradient, and the bodily fluid that has moved to the bottom region 23b contacts the bottom region 23b. It becomes easy to transfer to the absorber 4 through the second sheet 5 to be performed.

  Moreover, since the top area | region 23a of the high density ridge part 21 and the bottom part area | region 23b of the concave ridge part 22 are each extended in the vertical direction, a bodily fluid does not spread easily in the width direction of the panty liner 1, and a side leak of the bodily fluid Can be prevented. Furthermore, the top area 23 a of the high-density ridges 21 and the bottom area 23 b of the recesses 22 extend in the vertical direction, and the bottom area 23 b of the recesses 22 passes through the adhesive 6 to the second sheet. Since it is being fixed to 5, the uneven structure of the surface sheet 2 is hard to be crushed, and the said effect can be maintained.

  In addition, the topsheet 2 must constitute the topsheet 2 except for the bottom region 23b of the concave strip 22 that contacts the second sheet 5 that is the lower layer side member, and has no heat fusion point between the constituent fibers. , Texture such as softness is further improved. In particular, if the surface sheet 2 as a whole does not have a thermal fusion point between constituent fibers, the texture becomes very good.

  The second sheet 5 preferably has the following configuration from the viewpoint of more surely expressing the above-described effects.

The second sheet 5, from the viewpoint of cushioning properties and twist suppression improvement, the basis weight (BW ₅₎ is the basis weight of the topsheet 2 (BW ₂₎ and the basis weight of the absorbent body 4 is higher than (BW ₄₎ preferable. The basis weight of the surface sheet 2 here means the basis weight (I) of the entire surface sheet 2 obtained by the above formula (4). The basis weight of the topsheet 2 basis weight of (BW ₂₎ and the absorber 4 basis weight of the second sheet 5 with respect to (BW ₄₎ the ratio of _{(BW 5) (BW 5 /} BW 2, BW 5 / BW 4) is preferably Is 1.01 or more and 2.0 or less, more preferably 1.05 or more and 2.0 or less.

The basis weight (BW ₅ ) of the second sheet 5 is preferably 10 g / m ² or more, more preferably 30 g / m ² or more, and preferably 60 g / m ² or less, 50 g / m ^2. More preferably, it is m ² or less, specifically 10 g / m ² or more and 60 g / m ² or less, and more preferably 30 g / m ² or more and 60 g / m ² or less.

The basis weight (BW ₄ ) of the absorbent body 4 is preferably 10 g / m ² or more, more preferably 20 g / m ² or more, and preferably 80 g / m ² or less, 40 g / m ^2. More preferably, it is m ² or less, specifically 10 g / m ² or more and 80 g / m ² or less, and more preferably 20 g / m ² or more and 40 g / m ² or less.

The density (D ₅ ) of the second sheet 5 is preferably 0.02 g / cm ³ or more, more preferably 0.04 g / cm ³ or more, and 0.4 g / cm ³ or less. Is more preferably 0.2 g / cm ³ or less, specifically 0.02 g / cm ³ or more and 0.4 g / cm ³ or less, preferably 0.04 g / cm ³ or more and 0.0. More preferably, it is 2 g / cm ³ or less.

The density of the absorbent body 4 _{(D 4)} is preferably at 0.01 g / cm ³ or more, further preferably 0.05 g / cm ³ or more, and is 0.5 g / cm ³ or less are preferred, further preferably 0.4 g / cm ³ or less, preferably specifically is 0.01 g / cm ³ or more 0.5 g / cm ³ or less, 0.05 g / cm ³ or more zero. More preferably, it is 4 g / cm ³ or less.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, the absorbent article of this invention is not restrict | limited to this embodiment mentioned above at all, and can be changed suitably.
For example, the above embodiment is an example in which the present invention is applied to the panty liner 1, but instead, the present invention is applied to other absorbent articles such as sanitary napkins, incontinence pads, and disposable diapers. Also good.

  Further, in the panty liner 1 described above, as shown in FIGS. 1 and 3, the middle region 23 c having a fiber density lower than the fiber density of the top region 23 a and the fiber density of the bottom region 23 b is a longitudinal portion of the panty liner 1. Although extending continuously in the direction, it may extend intermittently. Specifically, as shown in FIG. 7 and FIG. 8, the fiber density of the top region 23a1, the fiber density of the bottom region 23b1, and the fiber density of the intermediate region 23c1 are equal fiber density portions 24 having the same fiber density. The equal fiber density portions 24 that extend continuously in the width direction of the liner 1 and extend continuously in the width direction are arranged intermittently at equal intervals in the longitudinal direction. The intermediate region 23c having a low fiber density excluding the region 23c1 may be formed extending intermittently in the longitudinal direction of the panty liner 1. Moreover, as shown in FIG.11 and FIG.12, the equal fiber density part 24 is distribute | arranged to the vertical direction and the width direction of the panty liner 1, and the intermediate region 23c with a low fiber density is the panty liner 1 It may be arranged in a staggered manner in the vertical direction and the width direction, and may extend intermittently in the vertical direction.

  The topsheet 2 of the panty liner 1 shown in FIG.7 and FIG.8 can be manufactured using the manufacturing apparatus 100 provided with the extending | stretching part 8 shown in FIG. Moreover, the surface sheet 2 of the panty liner 1 shown in FIG.11 and FIG.12 can be manufactured using the manufacturing apparatus 100 provided with the extending | stretching part 8 shown in FIG. In addition, about the manufacturing apparatus 100 provided with the extending | stretching part 8 shown in FIG.9 and FIG.13, a different point from the manufacturing apparatus 100 provided with the extending | stretching part 8 shown in FIG. 5 is mainly demonstrated, and the same code | symbol is attached | subjected about the same point. Therefore, the description is omitted.

  The extending portion 8 shown in FIG. 9 is formed such that one uneven roll 81 is formed by alternately arranging large-diameter convex portions 83 and small-diameter spacers 85 in the roll axis direction. Further, the other uneven roll 87 has a plurality of convex portions 88 (four in the manufacturing apparatus 100 shown in FIG. 9) extending along the circumferential direction of the roll 87 arranged at equal intervals in the circumferential direction. The diameter convex portions 89 and the small diameter spacers 86 are alternately arranged in the roll axis direction. The large-diameter convex portion 89 has a surface position of a portion where the convex portion 88 is not disposed coincident with a surface position of the spacer 86. And the large diameter convex part 89 which comprises the extending | stretching part 8 shown in FIG. 9 is the form with which the position of the convex part 88 of the large diameter convex parts 89 and 89 adjacent to a roll axial direction corresponds to the circumferential direction. is there.

  As shown in FIG. 9, the raw nonwoven fabric 2a is conveyed between the pair of concave and convex rolls 81 and 87 configured as described above. And between the top part of the large diameter convex part 83 of one uneven | corrugated roll 81, and the top part of the convex part 88 of the other uneven | corrugated roll 87, as shown to Fig.10 (a), the raw material nonwoven fabric 2a is extended in the width direction. To do. Here, the raw material nonwoven fabric 2a is formed to include at least 50% or more of non-heat-bondable hydrophilic fibers, and there is almost no heat-bonded portion between the constituent fibers. The arrangement | positioning of the constituent fiber which comprises the raw material nonwoven fabric 2a in the part extended | stretched between the top part of the part 83 and the top part of the convex part 88 of the other uneven | corrugated roll 87 shifts | deviates. Thus, the part where arrangement | positioning of the structure fiber shifted | deviated becomes the intermediate | middle area 23c with a low fiber density in the surface sheet 2 which has an uneven structure. Moreover, in the position of the top part of the large diameter convex part 83 of one uneven | corrugated roll 81, the part which is not extended | stretched becomes the bottom part area | region 23b of the concave part 22 of the surface sheet 2 which has an uneven structure. Moreover, the part which is not extended | stretched in the position of the top part of the convex part 88 of the other uneven | corrugated roll 87 becomes the top area | region 23a of the protruding item | line part 21 of the surface sheet 2 which has an uneven structure.

  Next, when the pair of concave and convex rolls 81 and 87 rotate in the circumferential direction, as shown in FIG. 10B, the concave and convex roll 87 between the convex portions 88 and 88 adjacent to each other in the circumferential direction of the other concave and convex roll 87. The raw material nonwoven fabric 2a is arranged between the surface and the surface of the spacer 86 and the top of the large-diameter convex portion 83 of one concave-convex roll 81, and a portion that is not stretched is formed on the topsheet 2. This unstretched portion becomes an equal fiber density portion 24 having the same fiber density as the fiber density of the top region 23a1, the fiber density of the bottom region 23b1, and the fiber density of the intermediate region 23c1. In particular, in the manufacturing apparatus 100 shown in FIG. 9, since the positions of the convex portions 88 of the large-diameter convex portions 89 adjacent to each other in the roll axis direction coincide with the circumferential direction, a portion that is not stretched is present. Since it is formed continuously in the roll axis direction, the equal fiber density portion 24 is formed so as to extend continuously in the width direction of the topsheet 2.

  And a pair of uneven | corrugated rolls 81 and 87 rotate continuously in the circumferential direction, and the same fiber density part 24 extended continuously in the width direction is performed in the vertical direction of the surface sheet 2 by repeating the above process. The topsheet 2 shown in FIG. 7 is manufactured, which is intermittently arranged at equal intervals, and the intermediate region 23c having a low fiber density extends intermittently in the vertical direction.

  Here, also in the equal fiber density part 24 extended continuously in the width direction, as shown in FIG. 8, the uneven structure is formed. However, the height h1 of the ridges 21 in the equal fiber density portion 24 is lower than the height h of the ridges 21 and 21 located in the front and rear of the equal fiber density portion 24 in the X direction. This is because the ridges 21 in the equal fiber density part 24 are not formed by the ridges of the pair of concavo-convex rolls 81 and 87, but the ridges 21 and 21 positioned in the front and rear in the X direction are This is because it is formed by being formed by the top of the convex portion 88 of the uneven roll 87. 7 and 8 has the same fineness not only in the fineness of the top region 23a, the fineness of the bottom region 23b, and the fineness of the intermediate region 23c, but also in the equal fiber density portion 24.

  The panty liner 1 shown in FIG. 7 manufactured using the top sheet 2 manufactured by the manufacturing apparatus 100 shown in FIG. 9 has a fiber density in the top region 23a1, a fiber density in the bottom region 23b1, and a fiber density in the intermediate region 23c1. However, the equal fiber density portions 24 having the same fiber density extend continuously in the width direction of the panty liner 1, and the equal fiber density portions 24 extending continuously in the width direction are intermittently spaced at equal intervals in the vertical direction. The intermediate region 23c having a low fiber density is intermittently extended in the longitudinal direction of the panty liner 1 and formed. Therefore, there is an effect of suppressing liquid diffusion in the vertical direction.

  Next, the topsheet 2 of the panty liner 1 shown in FIGS. 11 and 12 can be manufactured using a manufacturing apparatus 100 including the extending portion 8 shown in FIG. In the large-diameter convex portion 89 constituting the other concave-convex roll 87 of the extending portion 8 shown in FIG. 13, the positions of the convex portions 88 between the large-diameter convex portions 89, 89 adjacent to each other in the roll axis direction are shifted in the circumferential direction. In addition, one convex portion 88 of the other large-diameter convex portion 89 is disposed between the two convex portions 88 and 88 of one large-diameter convex portion 89. The large-diameter convex portion 89 has a surface position of a portion where the convex portion 88 is not disposed coincident with a surface position of the spacer 86. Then, the large-diameter convex portion 89 constituting the extending portion 8 shown in FIG. 13 is skipped by one in the roll axis direction, and the positions of the convex portions 88 between the adjacent large-diameter convex portions 89 and 89 are one in the roll axial direction. The convex portion 88 of the large-diameter convex portion 89 is arranged in a staggered pattern on the peripheral surface of the concave-convex roll 87.

  As shown in FIG. 13, the raw material nonwoven fabric 2a is conveyed between the pair of concave and convex rolls 81 and 87 configured as described above. And as shown in FIG. 14, between the top part of the large diameter convex part 83 of one uneven | corrugated roll 81, and the top part of the convex part 88 of the other uneven | corrugated roll 87, the raw material nonwoven fabric 2a is extended | stretched in the width direction. Here, the raw material nonwoven fabric 2a is formed to include at least 50% or more of non-heat-bondable hydrophilic fibers, and there is almost no heat-bonded portion between the constituent fibers. The arrangement | positioning of the constituent fiber which comprises the raw material nonwoven fabric 2a in the part extended | stretched between the top part of the part 83 and the top part of the convex part 88 of the other uneven | corrugated roll 87 shifts | deviates. Thus, the part where arrangement | positioning of the structure fiber shifted | deviated becomes the intermediate | middle area 23c with a low fiber density in the surface sheet 2 which has an uneven structure. Moreover, in the position of the top part of the large diameter convex part 83 of one uneven | corrugated roll 81, the part which is not extended | stretched becomes the bottom part area | region 23b of the concave part 22 of the surface sheet 2 which has an uneven structure. Moreover, the part which is not extended | stretched in the position of the top part of the convex part 88 of the other uneven | corrugated roll 87 becomes the top area | region 23a of the protruding item | line part 21 of the surface sheet 2 which has an uneven structure.

  Further, as shown in FIG. 14, a large-diameter convex having no convex portion 88 disposed between the large-diameter convex portions 89 and 89 having convex portions 88 adjacent to each other in the roll axis direction in the other concave-convex roll 87. The raw material nonwoven fabric 2a is arranged between the surface of the portion 89 and the surface of the spacer 86 and the top of the large-diameter convex portion 83 of one concave-convex roll 81, and a portion that is not stretched is formed on the topsheet 2. The This unstretched portion becomes an equal fiber density portion 24 having the same fiber density as the fiber density of the top region 23a1, the fiber density of the bottom region 23b1, and the fiber density of the intermediate region 23c1.

  In particular, in the manufacturing apparatus 100 shown in FIG. 13, since the convex portions 88 of the large-diameter convex portion 89 are arranged in a staggered pattern on the peripheral surface of the concave-convex roll 87, the pair of concave-convex rolls 81, 87 are provided. By rotating continuously in the circumferential direction and repeating the above steps, the equal fiber density portion 24 is arranged in a staggered pattern on the entire surface of the top sheet 2, and an intermediate region having a low fiber density. The surface sheet 2 shown in FIG. 11 in which 23c extends intermittently in the vertical direction is manufactured.

  Here, also in the equal fiber density part 24 arrange | positioned at zigzag shape, as shown in FIG. 12, the uneven structure is formed. However, the height h2 of the ridges 21 in the equal fiber density portion 24 is lower than the height h of the ridges 21 and 21 located in the front and rear of the equal fiber density portion 24 in the X direction. This is because the ridges 21 in the equal fiber density part 24 are not formed by the ridges of the pair of concavo-convex rolls 81 and 87, but the ridges 21 and 21 positioned in the front and rear in the X direction are This is because it is formed by being formed by the top of the convex portion 88 of the uneven roll 87. 11 and 12 has the same fineness not only in the fineness of the top region 23a, the fineness of the bottom region 23b, and the fineness of the intermediate region 23c, but also in the equal fiber density portion 24.

  The panty liner 1 shown in FIG. 11 manufactured using the top sheet 2 manufactured by the manufacturing apparatus 100 shown in FIG. 13 has the equal fiber density portions 24 arranged in a staggered manner in the longitudinal direction and the width direction of the panty liner 1. The intermediate region 23c having a low fiber density is arranged in a staggered manner in the longitudinal direction and the width direction of the panty liner 1, and is formed to extend intermittently in the longitudinal direction. Therefore, there is an effect of suppressing liquid diffusion in the vertical direction.

  Further, as shown in FIG. 2, the lower layer side member in contact with the top sheet 2 is the second sheet 5 in the panty liner 1, but may be other than the second sheet 5. For example, in an absorbent article that does not have the second sheet 5, the lower layer side member that contacts the top sheet 2 may be the absorbent body 4.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples.

[Example 1]
The top sheet 2 of Example 1 was produced using the manufacturing apparatus 100 shown in FIG. For the topsheet 2, a 100% cotton fiber non-woven fabric, which is a non-heat-bondable hydrophilic fiber, was used as a raw material non-woven fabric. The fiber density of the entire surface sheet 2 was 0.02 g / cm ³ . The fiber density of the intermediate portion region 23c _{(D 23c)} is 0.03 g / cm ^3, the fiber density in the top zone 23a _{(D 23a),} and the fiber density in the bottom zone 23b _{(D 23b)} is It was 0.09 g / cm ³ . Moreover, the basic weight of the whole surface sheet 2 was 21 g / m < ² >. Moreover, the basic weight of the intermediate | middle area 23c was 13 g / m < ² >, and the basic weight in the top area | region 23a and the basic weight in the bottom area 23b were 34 g / m < ² >. Furthermore, the pitch between the tops of the ridges 21 adjacent in the width direction (Y direction) was 2 mm, and the height h of the ridges 21 was 1.2 mm.

[Comparative Example 1]
The 100% cotton fiber nonwoven fabric used as the raw material nonwoven fabric of the topsheet 2 of Example 1 was used as the topsheet of Comparative Example 1. That is, the surface sheet of Comparative Example 1 has no ridges and concave parts, and the surface sheet of Comparative Example 1 has a flat shape.

[Evaluation]
The surface sheet and the second sheet were removed from a commercially available panty liner (trade name “Lorrie Clean Style”, manufactured by Kao Corporation), and the surface sheet and the second sheet of Example 1 and Comparative Example 1 were disposed instead. As the second sheet, an airlaid nonwoven fabric containing pulp fibers was used. A panty liner for evaluation was prepared by fixing the periphery of the top sheet and the second sheet of Example 1 and Comparative Example 1 to the panty liner from which the top sheet and the second sheet were removed. About the produced panty liner, the absorption time, the amount of wicking remaining, and the diffusion area were measured by the following methods. Moreover, about the surface sheet of Example 1 and Comparative Example 1, the compression work was measured and the texture was evaluated. The results are shown in Table 1 below.

[Absorption time]
A panty liner was placed horizontally with the top sheet facing upward, and an acrylic plate with an inlet having a diameter of 1 cm was placed at the center of the top sheet. 0.5 g of pseudo blood was injected from the injection port, and the time until the injected pseudo blood was completely absorbed was measured, and this was taken as the absorption time.

[Remaining suction volume and diffusion area]
Pseudoblood 0.3g was dripped on the flat surface plate made of glass placed horizontally. On top of this, a panty liner was placed with the top sheet facing down. After maintaining that state for 1 minute, the panty liner was removed and the amount of simulated blood remaining on the plate was measured. The amount was taken up and used as the remaining amount. The diffusion area of the pseudo blood to the surface sheet after 1 minute was measured by image software (Media Cybernetics, Inc., trade name “Image-Pro Plus”).

[Compression work WC]
Using a Kato Tech Co., Ltd. KES FB3-AUTO-A type apparatus, the compression work WC was measured under the conditions of a pressure area of 2 cm ² , a compression speed of 0.02 mm / sec, and an upper limit load of 50 gf / cm ² . The larger the value of the compression work WC, the softer it is, and it is evaluated that the texture is good.

  As is clear from the results shown in Table 1, it was found that the surface sheet of Example 1 had a larger value of compression work WC than the surface sheet of Comparative Example 1, was soft, and had a good texture. In addition, the top sheet of Example 1 has a shorter absorption time, a smaller amount of residual wicking, and a smaller diffusion area than the top sheet of Comparative Example 1, so that it has excellent spot absorbability and is uncomfortable when using a panty liner. It can be expected that the feeling of rattling is suppressed.

DESCRIPTION OF SYMBOLS 1 Panty liner 2 Top sheet 21 Convex part 22 Concave part 23a Top part area 23b Bottom part 23c Middle part area 24 Equal fiber density part 23a1 Top part area of equal fiber density part 23b1 Bottom area 23c1 Equal fiber density part Intermediate area 3 Back sheet 4 Absorber 5 Second sheet 6 Adhesive 7 Peripheral part 100 Manufacturing device 8 Stretching part 81, 82, 87 Concave roll 83, 84, 89 Large-diameter convex part 85,86 Spacer 88 Convex part

Claims (5)

An absorbent article comprising a liquid-permeable surface sheet that forms a skin facing surface, having a longitudinal direction corresponding to the wearer's front-rear direction and a width direction perpendicular to the longitudinal direction,
The top sheet is formed of a non-woven fabric containing 50% by mass or more of non-heat-bondable hydrophilic fibers,
The topsheet is formed in a concavo-convex structure in which streaky ridges and ridges extending in the vertical direction are alternately arranged in the width direction,
The absorbent article in which the density of the intermediate region between the top region of the convex portion and the bottom region of the concave portion is lower than the density of the top region and the density of the bottom region.   The surface sheet has a heat-bonding point between constituent fibers constituting the surface sheet, except for a bottom region of the concave portion that contacts a lower layer side member disposed on the non-skin facing surface side of the surface sheet. The absorbent article of Claim 1 which does not have.   The absorptive article according to claim 1 provided with a lower layer side member on the non-skin opposing surface side of said surface sheet, and the lower layer side member and said surface sheet are adhesively fixed.   The absorptive article according to claim 3 in which said surface sheet does not have a heat fusion point of constituent fibers which constitute this surface sheet. The absorbent article includes the top sheet, a liquid-impermeable back sheet, and an absorber interposed between the two sheets, and a liquid-permeable second sheet is provided between the top sheet and the absorber. Has
The lower layer side member is the second sheet,
The basis weight of the second sheet is higher than the basis weight of the top sheet and the basis weight of the absorber, and the density is lower than the density of the top sheet and the absorber. 5. The absorbent article according to any one of 4.

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