JP5074977B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article that enhances the diffusibility and absorbability of liquid in a surface sheet, effectively prevents the return of bodily fluids, is rich in three-dimensional effects, and has high cushioning properties.

  Conventionally, as a surface material of an absorbent article, an appropriate embossing pattern has been given according to various purposes such as reducing the contact area with the skin to suppress the moist feeling, or giving the texture and enhancing the touch. Things are offered to the market.

  For example, in Patent Document 1 below, a large number of ridges and groove portions are alternately arranged so as not to have a flat surface portion, the ridge portions are curved in a convex shape, and the groove portions are curved in a concave shape, An absorbent article using a nonwoven fabric having a large number of apertures arranged at intervals as the groove is used as a top sheet is disclosed.

  However, when unevenness is formed on the top sheet, the adhesion with the body fluid absorbent member disposed on the lower surface side is lowered, and thus a new problem arises that menstrual blood diffusibility and absorbability are lowered. . In view of this, a technique has been proposed in which the flow of body fluid is controlled by providing a density gradient difference in the top sheet or the second sheet disposed on the bottom surface of the top sheet.

  For example, in the following Patent Document 2, a water-permeable surface-side sheet facing the body side, a back-side sheet facing the clothing side, and a function of absorbing body fluid contained in the surface-side sheet and the back-side sheet are included. In an absorbent article comprising a liquid-absorbent core, the fiber density on the side facing the liquid-absorbent core is more than the fiber density on the side facing the surface-side sheet between the surface-side sheet and the liquid-absorbent core. An absorbent article provided with a large body fluid permeable sheet (second sheet) has been proposed. In the case of this absorbent article, the body fluid that has passed through the surface side sheet and reached the upper surface of the body fluid permeable sheet moves so as to be guided to the higher fiber density gradient (liquid absorbent core side). It will be absorbed in.

Moreover, in the following patent document 3, in the nonwoven fabric surface sheet processed into the corrugated uneven surface, the fiber density is high at the top and bottom of the wave, and the fiber density is small at the side wall, so that the fiber density is high. And a surface sheet in which a large number of apertures are formed at the boundary between the region where the fiber density is low (see paragraph [0050] of FIG. 4 and FIG. 4).
JP-A-8-302555 JP 2003-210523 A JP 2001-328191 A

  However, in the case of the absorbent article described in Patent Document 2, the diffusibility and absorbability of body fluid are reliably improved by the body fluid-permeable sheet, but the diffusibility on the surface sheet surface that directly contacts the skin is insufficient. The sticky feeling has not been resolved.

  In the surface sheet described in Patent Document 3, the body fluid moves relatively from the low fiber density region side to the high fiber density region side, but the body fluid is retained at the top portion because the top portion of the wave has the high fiber density region. Easy and sticky. In addition, since a large number of apertures are formed at the boundary between the high fiber density region and the low fiber density region, there is a problem that the fiber density gradient cannot be made and menstrual blood is difficult to move to the aperture. .

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an absorbent article having a high cushioning property in the topsheet, which enhances the diffusibility and absorbability of the liquid, effectively prevents the return of bodily fluids and is rich in three-dimensionality. It is in.

In order to solve the above-mentioned problem, as the present invention according to claim 1, in an absorbent article in which an absorbent body is interposed between a liquid-permeable top sheet and a back sheet,
The surface sheet is a non-woven fabric having a two-layer structure composed of an upper layer and a lower layer, and the fineness of the upper layer non-woven fabric> the fineness relationship of the lower layer non-woven fabric, and the concave and convex portions are alternately provided by embossing in a predetermined pattern. The surface sheet is formed adjacent to each other, and is divided into a central region including the body fluid discharge portion and a peripheral region surrounding the central portion region. In the central region including the body fluid discharge portion, the concave portion is relatively A high density region having a high fiber density, the convex portion is a low density region having a relatively low fiber density, and in the peripheral region, the concave portion is a low density region having a relatively low fiber density, protrusions is relatively fiber dense high-density region, the lower surface of the topsheet, the surface porosity plastic sheet number of apertures high hydrophilicity is formed than the sheet disposed Absorbent article, wherein provided that it is.

  In the present invention according to the first aspect, the nonwoven fabric has a two-layer structure composed of an upper layer and a lower layer, and the fineness of the upper nonwoven fabric> the fineness of the lower nonwoven fabric. That is, by lowering the fineness of the lower layer side nonwoven fabric, the density of the lower layer nonwoven fabric is made higher than that of the upper layer nonwoven fabric so as to form a density relationship between the upper and lower layer nonwoven fabrics.

  At the same time, the top sheet is embossed in a predetermined pattern so that recesses and projections are alternately formed adjacent to each other, and the recesses are formed into a high-density region having a relatively high fiber density. Is a low density region having a relatively low fiber density.

  Therefore, when the body fluid is discharged to the top sheet, the body fluid present in the convex portion moves quickly toward the concave portion due to the fiber density gradient, so that the diffusibility of the body fluid is improved and the density between the nonwoven fabrics of the upper and lower layers is improved. Due to the relationship, body fluid is not retained on the surface side (convex portion) and moves to the absorber side, so that the sticky feeling of the surface sheet is eliminated.

  Further, a porous plastic sheet having a higher degree of hydrophilicity than the surface sheet and having a large number of apertures is disposed on the lower surface side of the surface sheet. Therefore, after diffusing so that the bodily fluid collects in the recess, many of them pass through the porous plastic sheet with high body fluid permeability disposed on the lower layer side to reach the absorber, and even if pressure is applied thereafter, it will return Will be prevented.

Further, in the first aspect of the invention, the topsheet is divided into a central region including the body fluid discharge portion and a peripheral region surrounding the central region, and the central region is defined in the first aspect. As defined in the invention, the concave portion is a high density region having a relatively high fiber density, and the convex portion is a low density region having a relatively low fiber density. The relationship is reversed, that is, the concave portion is a low density region having a relatively low fiber density, and the convex portion is a high density region having a relatively high fiber density.

  In the peripheral region, the concave portion is a low-density region having a relatively low fiber density, so that the flexible low-density region portion can create a spring effect and can provide a high cushioning property. Moreover, the convexity that comes into contact with the skin is a high-density region having a relatively high fiber density, so that the smoothness is increased and the touch feeling is improved.

  The absorbent article according to claim 1, wherein in the surface sheet, the fineness of the upper nonwoven fabric is 2.2 to 1.7 dt, and the fineness of the lower nonwoven fabric is less than 1.7 dt. Is provided.

  The present invention described in claim 2 specifically defines the fineness of the upper and lower nonwoven fabrics in the surface sheet. In the case of a conventional surface sheet using a nonwoven fabric, fibers having a fineness of about 2 to 3 dt are used, but there is a drawback that the touch feeling is not smooth. Therefore, when trying to reduce the fineness of the nonwoven fabric to give it smoothness, the density of the fibers is increased and menstrual blood remains on the surface sheet. In the present invention, even if the fineness of the upper non-woven fabric is reduced to 2.2 to 1.7 dt in order to impart smoothness, the fineness of the lower non-woven fabric is set to less than 1.7 dt, which is lower than that. As a result, menstrual blood is absorbed on the absorber side, and menstrual blood does not remain on the top sheet.

As the present invention according to claim 3 , in the porous plastic film, the hydrophilicity of the surface on the absorber side is set higher than the surface on the surface sheet side, and a hydrophilicity gradient is provided from the front surface side to the back surface side. An absorbent article according to any one of claims 1 and 2 is provided.

In the present invention described in claim 3, the hydrophilicity of the surface of the porous plastic film on the absorber side is set higher than the surface on the surface sheet side in order to increase the drawing force of the body fluid to the absorber side, A hydrophilicity gradient is given to the side.

As the present invention according to claim 4, wherein the openings of the porous plastic film, opening diameter of the surface sheet side of claim 1 to 3 or formed in a large funnel than the opening diameter of the absorbent body side An absorbent article is provided.

In the present invention described in claim 4 above, the opening is formed in a funnel shape so as not to reverse the body fluid that has once passed through the porous plastic film.

  As described above in detail, according to the present invention, it is possible to increase the diffusibility and absorptivity of the liquid, effectively prevent the body fluid from returning, and have an excellent three-dimensional effect, thereby obtaining an absorbent article having a high cushioning property. .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially broken perspective view of a sanitary napkin 1 according to the present invention.
[Structure of absorbent article 1]
The sanitary napkin 1 is mainly used for applications such as panty liners, sanitary napkins, cage sheets, incontinence pads, and the like. For example, as shown in FIG. Between the liquid-permeable surface sheet 3 (hereinafter, simply referred to as a surface sheet), as shown in the figure, the absorber 4 or the absorber 4 preferably surrounded by the crepe paper 5 is interposed, The porous plastic film 6 is disposed between the top sheet 3 and the absorber 4 on the lower surface side of the top sheet 3. In addition, in the circumference | surroundings of the said absorber 4, the said liquid-impermeable back sheet 2 and the surface sheet 3 are joined by adhesion | attachment means, such as a hot-melt-adhesive.

  The liquid-impervious back sheet 2 is made of a sheet material having at least water-impervious properties such as polyethylene and polypropylene, but in addition to this, a non-woven sheet after securing a substantially liquid-impervious property through a waterproof film. (In this case, a liquid-impervious back sheet is composed of the waterproof film and the nonwoven fabric). In recent years, those having moisture permeability tend to be suitably used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.

  As shown in FIG. 2, the surface sheet 3 is a non-woven fabric having a two-layer structure composed of an upper layer 3A and a lower layer 3B, and the fineness relationship of the upper layer non-woven fabric 3A> the fineness relationship of the lower layer non-woven fabric 3B is shown in FIG. As described above, embossing is applied in a predetermined pattern, whereby the concave portions 8, 8... And the convex portions 7, 7... Are alternately formed adjacent to each other, and the concave portions 8, 8. The convex portions 7, 7... Are low density regions having a relatively low fiber density. The surface sheet 3 will be described in more detail later.

  The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the top sheet 3 is, for example, a mixture of a superabsorbent resin in pulp, or a mixture of chemical fibers in the pulp, What mixed the superabsorbent resin is used. As shown in the figure, it is desirable that the absorbent body 4 is surrounded by crepe paper 5 in order to maintain its shape and quickly diffuse menstrual blood and prevent reverse return of menstrual blood once absorbed. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price.

  Examples of the superabsorbent resin include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process of the highly water-absorbent resin having the water absorption performance, the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient. The content of the superabsorbent resin is preferably 10 to 60%. When the content of the superabsorbent resin is less than 10%, sufficient absorbability cannot be provided, and when it exceeds 60%, the entanglement between the pulp fibers disappears, the sheet strength decreases, and tears, cracks, etc. Is likely to occur.

  As shown in FIG. 6, the highly water-absorbent resin 9 is preferably unevenly distributed and mixed so that the content on the porous plastic film 6 side is larger than that on the back sheet 2 side. Thereby, the body fluid that has reached the porous plastic film 6 can be effectively drawn into the absorber 4.

  The porous plastic film 6 disposed between the liquid-permeable surface sheet 3 and the absorber 4 has a higher hydrophilicity than the surface sheet 3 and a film sheet in which a large number of apertures 6a, 6a. It is. As the material of the film, for example, an olefin-based thermoplastic resin film such as polyethylene or polypropylene is preferably used, but a polyamide-based resin such as polyester or nylon, EVA, or the like can also be used.

The diameter of the opening 6a is 0.05 to 2.0 mm, preferably 0.1 to 1.0 mm, and the number of openings is preferably about 200 to 600 holes / cm ² . In order to form the opening 6a, the synthetic resin sheet is softened near the softening temperature and is positioned on the upper surface of the support having a large number of openings, and is sucked from below the support. The method can be opened by pressurizing air pressure from the top surface of the sheet, or by engraving a large number of slits in the synthetic resin sheet material and then stretching and opening the sheet material, and by piercing many needles (heating needles). There are various methods such as a method of forming a hole, which can be formed by an appropriate method, but in order to prevent the bodily fluid that has once passed therethrough, as shown in FIG. In addition, it is desirable to form a funnel shape in which the opening diameter d1 on the top sheet 3 side is larger than the opening diameter d2 on the absorber 4 side. FIG. 5A shows an embodiment in which the opening is formed in an inverted truncated cone shape, and FIG. 5B shows an embodiment in which the opening is formed in a deformed shape. Further, in the accompanying drawings, openings other than those in FIG. 5 are omitted.

[Surface layer structure consisting of top sheet 3 and porous plastic film 6]
As described above, the surface sheet 3 is a non-woven fabric having a two-layer structure including the upper layer 3A and the lower layer 3B, and the fineness of the upper layer non-woven fabric 3A> the fineness relationship of the lower layer non-woven fabric 3B. Specifically, the fineness of the upper nonwoven fabric 3A is 2.2 to 1.7 dt, and the fineness of the lower nonwoven fabric 3B is less than 1.7 dt. In this case, fibers having different finenesses may be used for the fibers constituting the upper layer nonwoven fabric 3A and the fibers constituting the lower layer nonwoven fabric 3B, and the fineness is increased by mixing fibers having different finenesses into the upper layer nonwoven fabric 3A. It may be.

  In addition, the basis weight of the upper layer nonwoven fabric 3A and the lower layer nonwoven fabric 3B is preferably in a basis weight relationship of the basis weight of the upper layer nonwoven fabric 3A> the basis weight of the lower layer nonwoven fabric 3B. Thereby, the cushioning property in 3 A of upper layer nonwoven fabrics which contact skin can be made favorable.

  As shown in FIG. 3, the surface sheet 3 is provided with embossments in a predetermined pattern so that concave portions 8, 8,... And convex portions 7, 7,. In addition, in the central region S including at least the body fluid discharge portion H, the concave portions 8, 8... Are relatively high fiber density regions, and the convex portions 7, 7,. It is a low density region.

  The material fiber constituting the surface sheet 3 can be, for example, synthetic fibers such as polyethylene or polypropylene, such as olefins, polyesters, polyamides, etc., air-through method, spunlace method, spunbond method, thermal bond method A nonwoven fabric obtained by an appropriate processing method such as a melt blown method or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the air-through method and the thermal bond method are excellent in terms of being bulky and soft. Among these, it is desirable to use an air-through non-woven fabric that easily gives a fiber density gradient.

  The non-woven fiber may be either a long fiber or a short fiber, but preferably a short fiber is used in order to give a towel texture. In order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can be suitably used.

  The top sheet 3 is hydrophilic to body fluid. Specifically, synthetic fibers such as polyethylene or polypropylene, such as olefins, polyesters, and polyamides, are surface-treated with a hydrophilizing agent, or a compound having a hydrophilic group in the synthetic fiber production process, for example, polyethylene glycol is oxidized. Synthetic fibers are swollen or porous by polymerizing in the presence of substances, or by treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxides And using a fiber imparted with hydrophilicity by applying capillary action.

  In this case, the hydrophilicity may be changed between the upper nonwoven fabric 3A and the lower nonwoven fabric 3B in the topsheet 3. For example, the upper nonwoven fabric 3A is regular hydrophilic, and the lower nonwoven fabric 3B is durable hydrophilic. By raising the hydrophilicity of the lower layer nonwoven fabric 3B, the body fluid can be effectively transferred to the lower layer nonwoven fabric 3B side without leaving a body fluid on the surface.

  The concave portions 8, 8,... And the convex portions 7, 7,... Are alternately formed adjacent to the surface sheet 3, and the concave portions 8, 8,. In order to provide embossing so that the convex portions 7, 7... Are in a low density region having a relatively low fiber density, as shown in FIG. 7, the convex portions 10a, 10a... And the concave portions 10b, 10b. Are constituted by a first embossing roll 10 in which a large number of ... are arranged, a second embossing roll 11 in which a large number of convex parts 11a, 11a ... and concave parts 11b, 11b ... are arranged, and in a meshed state. The convex portion 10a of the first embossing roll 10 and the concave portion 11b of the second embossing roll 11 are in contact with or close to each other, and between the first embossing roll 10 and the second embossing roll 11 are used. To the surface sea 3, the concave portions 8, 8... And the convex portions 7, 7... Are alternately formed adjacent to each other, and the fiber density is higher than that of the convex portions 7 by the high compression of the concave portions 8, 8. Can be.

  The interval P between the concave portions 8, 8... Is 2 to 6 mm, preferably 3 to 5 mm, and is formed so that the convex portions 7, 7. Further, it is desirable that the concave portions 8, 8... And the convex portions 7, 7,. Further, the height difference h is desirably 0.3 to 2 mm, preferably 0.5 to 1.0 mm.

  The porous plastic film 6 laminated on the lower surface side of the topsheet 3 is treated with a hydrophilizing agent so that the hydrophilicity is higher than that of the topsheet 3. Such imparting of hydrophilicity is achieved by applying a surfactant (hydrophilizing agent) to the front and back surfaces of the porous plastic film 6.

  Examples of the surfactant include an anionic surfactant, carboxylate, acylated hydrolyzed protein, sulfonate, sulfate ester salt, phosphate ester salt, nonionic surfactant, polyoxyethylene-based interface Activators, carboxylic acid esters, carboxylic acid amides, polyalkylenoxide block copolymers, cationic surfactants, quaternary ammonium salts, amphoteric surfactants, imidazolinium derivatives, etc. Any surfactant may be used as long as it is a known surfactant applied to the fiber.

  Examples of the method for applying the surfactant include spray coating, gravure printing and flexographic printing, and curtain coating using various coaters. The hydrophilicity can be adjusted by adjusting the coating amount of the surfactant.

  Further, in the porous plastic film 6, as shown in FIG. 6, the hydrophilicity of the surface on the absorber 4 side is set higher than the surface on the surface sheet 3 side, and the hydrophilicity gradient is set from the front surface side to the back surface side. You may make it have. By providing the hydrophilicity gradient, the body fluid present on the upper surface of the porous plastic film 6 can be effectively drawn into the absorber 4 side.

  After embossing is given to the top sheet 3 in the state of a single sheet, it is laminated with the porous plastic film 6. In this case, it is desirable that the concave portions 8, 8. As a joining method, any method such as heat fusion, ultrasonic fusion, and adhesive can be employed. Since there is a space between the porous plastic film 6 in the convex portions 7, 7... Other than the concave portions 8, 8. In the case of bonding with an adhesive, the coating pattern is a sigma pattern coating in which wavy lines are arranged more finely than a spiral spiral pattern coating in order to prevent the top sheet 3 from floating and to be bonded uniformly to the porous plastic film 6. Is desirable.

Or if the detail the surface structure, as shown in FIG. 6, the convex portions 7, 7 is a relatively low fiber density and low density regions D _L, the recesses 8, 8 ... the relative A high density region _DH having a high fiber density is formed, and a fiber density gradient from the low density region _DL to the high density region _DH is formed. As a result, when the body fluid is discharged to the surface sheet 3, the body fluid present in the convex portions 7, 7... Moves quickly toward the concave portions 8, 8. made with, for body fluid on the surface side (the low-density region D _L side) is eliminated to be water retention, so that feeling sticky is eliminated. In addition, a porous plastic film 6 having high permeability is disposed on the lower layer side, and the porous plastic film 6 is set to have a higher hydrophilicity than the top sheet 3, so that the body fluid is in the recesses 8, 8. After diffusing so as to gather together, most of them permeate the porous plastic sheet 6 with high water permeability disposed on the lower layer side and reach the absorber 4, and even when pressure is applied thereafter, reversal is prevented. It becomes like this.

By the way, as shown in FIG. 1, the top sheet 3 is divided into a central region S including the body fluid discharge portion H and a peripheral region K surrounding the central region S. In the central region S, As described above, the recesses 8, 8... Are relatively high density regions with a relatively high fiber density, and the protrusions 7, 7... Are relatively low density regions with a low fiber density. in the peripheral region K, as shown in FIG. 8, the relationship fiber density relationship opposite, i.e. recesses 8, 8 ... are the relatively low fiber density and low density regions D _L, the convex portions 7, 7 are It is desirable that the high density region _{DH has} a relatively high fiber density. In the peripheral region K, by the recess 8 is the relatively low fiber density and low density regions D _L, that this flexible low-density region D _L so to speak creating a spring effect, to impart high cushioning It becomes possible.

  In order to reverse the fiber density relationship between the convex portion 7 and the concave portion 8 in the central region S and the peripheral region K, as shown in FIG. 9, in the central region S, the convex portions 10a, 10d,. And a plurality of concave portions 10b, 10c... And a second embossing roll 11 in which a plurality of convex portions 11a, 11d... And concave portions 11b, 11c. In the central region S, the convex portion 10a of the first embossing roll 10 and the concave portion 11b of the second embossing roll 11 are in contact with or close to each other, and the peripheral region K has the first portion. An embossing roll 10 having a concave portion 10c and a convex portion 11d of the second embossing roll that are in contact with each other or close to each other is used, and the front portion between the first embossing roll 10 and the second embossing roll 11 is used. It suffices to pass the topsheet 3.

[Other examples]
(1) In the above embodiment, the convex portions 7, 7..., The concave portions 8 are formed in a lattice shape or a zigzag shape in the napkin longitudinal direction and short direction, but the convex portions 7, 7. , 8... May be formed alternately along one direction, that is, in a wave shape.
(2) In the above embodiment, the surface sheet 3 is embossed in the state of a single sheet and then laminated with the porous plastic film 6. However, the surface sheet 3 and the porous plastic film 6 are bonded with an adhesive. After bonding together, embossing may be applied. In order to improve the adhesion between the high density region of the surface sheet 3 and the porous plastic film 6 and facilitate the transition of menstrual blood, embossing the surface sheet and the porous plastic film together rather than bonding only the adhesive Adhesion is higher when applied.

  In this case, in order to maintain the softness of the topsheet 3, it is desirable not to apply heat to the portion of the topsheet 3 that contacts the skin side. Specifically, as shown in FIG. 10, the heat release space 10 c of the concave portion 0 b portion of the first embossing roll 10 is continuously formed so that heat is not applied to the top sheet 3. Since heat is not applied to the portions of the surface sheet 3 that are the convex portions 7, 7..., The surface sheet 3 and the porous plastic film 6 are not thermally fused, and there is a space between the surface sheet 3 and the porous plastic film 6. Since it is formed, the cushioning property is maintained. The embossing temperature condition during operation is that the melting point is 130 ° C. when the porous plastic film is high-density polyethylene, and the operation is performed at 130 ° C. or less, and the melting point is 90 ° C. for low-density polyethylene. Therefore, it operates at 90 ℃ or less.

Part of the absorbent article 1 according to the present invention is a step perspective view. It is sectional drawing of the surface sheet 3. FIG. It is the principal part expanded horizontal sectional view. It is a principal part expanded sectional view of the surface sheet 3 for demonstrating an effect. (A) and (B) are the principal part expanded sectional views which show the opening aspect of the porous plastic film 6, both. It is a principal part expanded sectional view which shows the modification of this absorbent article. It is a figure which shows the meshing state of the 1st embossing roll 10 and the 2nd embossing roll 11. FIG. It is a cross-sectional view showing three examples of the surface sheet in which the density relationship is changed between the central region S and the peripheral region K. It is a figure which shows the meshing state of the 1st embossing roll 10 and the 2nd embossing roll 11 in that case. FIG. 6 is a cross-sectional view of an embossing roll showing a modification of the first embossing roll 10.

DESCRIPTION OF SYMBOLS 1 ... Absorbent article (sanitary napkin), 2 ... Liquid-impermeable back sheet, 3 ... Liquid-permeable surface sheet, 4 ... Absorber, 5 ... Crepe paper, 6 ... Porous plastic film, 7 ... Convex part, DESCRIPTION OF SYMBOLS 8 ... Concave part, 9 ... High water absorption resin, 10 ... 1st embossing roll, 10a * 10d ... Convex part, 10b * 10c ... Concave part, 11 ... 2nd embossing roll, 11a * 11d ... Convex part, 11b * 11c ... concave portion, D _L ... low density region, D _H ... high density region, S ... central region, K ... peripheral region

Claims (4)

In the absorbent article in which an absorbent body is interposed between the liquid-permeable top sheet and the back sheet,
The surface sheet is a non-woven fabric having a two-layer structure composed of an upper layer and a lower layer, and the fineness of the upper layer non-woven fabric> the fineness relationship of the lower layer non-woven fabric, and the concave and convex portions are alternately provided by embossing in a predetermined pattern. The surface sheet is formed adjacent to each other, and is divided into a central region including the body fluid discharge portion and a peripheral region surrounding the central portion region. In the central region including the body fluid discharge portion, the concave portion is relatively A high density region having a high fiber density, the convex portion is a low density region having a relatively low fiber density, and in the peripheral region, the concave portion is a low density region having a relatively low fiber density, protrusions is relatively fiber dense high-density region, the lower surface of the topsheet, the surface porosity plastic sheet number of apertures high hydrophilicity is formed than the sheet disposed Absorbent article characterized in that it is.   2. The absorbent article according to claim 1, wherein in the topsheet, the fineness of the upper nonwoven fabric is 2.2 to 1.7 dt, and the fineness of the lower nonwoven fabric is less than 1.7 dt. Wherein the porous plastic film, the hydrophilicity of the surface of the absorbent body side is set higher than the surface of the surface sheet side, according to claim 1-2 or the toward the rear surface side are so as to have a hydrophilicity gradient from the surface side Absorbent articles. The absorbent article according to any one of claims 1 to 3, wherein the opening of the porous plastic film is formed in a funnel shape in which the opening diameter on the top sheet side is larger than the opening diameter on the absorber side.

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