WO2013077074A1

WO2013077074A1 - Absorptive article and manufacturing method therefor

Info

Publication number: WO2013077074A1
Application number: PCT/JP2012/074428
Authority: WO
Inventors: 政浩柏木
Original assignee: ユニ・チャーム株式会社
Priority date: 2011-11-25
Filing date: 2012-09-24
Publication date: 2013-05-30
Also published as: JP2013111127A; TW201334766A; CN103906489B; JP6222886B2; TWI620552B; CN103906489A

Abstract

The present invention addresses the problem of providing an absorptive article less likely to allow bodily fluid, which has been discharged from the wearer, to leak from the absorptive article. To solve the problem, this absorptive article (1) comprises: a liquid permeable front surface sheet (20); a liquid impermeable rear surface sheet (30) provided at a position facing the front surface sheet (20); an absorption body (40) provided between the front surface sheet (20) and the rear surface sheet (30); and a second sheet (50) provided between the front surface sheet (20) and the absorption body (40). Recesses (70) extending from the front surface sheet (20) to the inside of the second sheet (50) are formed by heating and compression in the thickness direction. The fibers of the front surface sheet (20) are thermo-plastically deformed in the recesses (70). The linear shape of the fibers of the front surface sheet (20) is maintained at the bottoms of the recesses (70). The front surface sheet (20) is joined to the second sheet using an adhesive agent, and the second sheet (50) includes air-laid nonwoven fabric containing pulp.

Description

Absorbent article and manufacturing method thereof

The present invention relates to absorbent articles such as sanitary napkins, panty liners, incontinence pads, and incontinence liners and methods for producing the same, and more particularly to thin absorbent articles and methods for producing the same.

A thin absorbent article in which a plurality of recesses are formed from a surface layer to an absorbent layer is known as a conventional technique (for example, Patent Document 1). This absorbent article is formed from the surface layer to the absorbent layer even when a thin absorbent layer is used because the surface layer forming the recesses and the fibers forming the absorbent layer are joined. The recesses are not easily crushed even when wet. Thereby, it can be made easy to always let a bodily fluid permeate from a crevice to an absorption layer. Moreover, since the bulk of the surface layer can be increased, the contact of the absorbent article with the skin becomes soft.

JP 2003-291234 A

There is a demand for a thin absorbent article that further facilitates penetration of body fluid from the recess formed in the absorbent article into the absorbent body and prevents the body fluid discharged from the wearer from leaking more easily.

The present invention employs the following configuration in order to solve the above problems.
That is, the absorbent article of the present invention includes a liquid-permeable surface sheet, a liquid-impermeable back sheet provided at a position facing the surface sheet, and an absorber provided between the surface sheet and the back sheet. And a second sheet provided between the top sheet and the absorbent body, and a plurality of recesses from the top sheet to the inside of the second sheet are formed by heating and compressing in the thickness direction. It is thermoplastically deformed and the linear shape of the fibers of the topsheet is maintained at the bottom of the recess, the topsheet is joined to the second sheet using an adhesive, and the second sheet has pulp Includes airlaid nonwoven.
The present invention also provides a liquid-permeable top sheet, a liquid-impervious back sheet provided at a position facing the top sheet, an absorbent provided between the top sheet and the back sheet, and a top sheet And a second sheet provided between the absorbent body, the absorbent article having a main body portion, a plurality of recesses from the top sheet to the inside of the second sheet are formed, and the longitudinal direction of the absorbent article When the width of the main body portion in the central width direction is 10 cm, the longitudinal direction of the absorbent article is horizontal along the flat surface of the plate on a plate inclined by 10 ° with respect to the horizontal plane. When 7 ml of artificial menstrual blood is injected at the injection rate of 96 ml / min at the center position in the longitudinal direction and width direction of the absorbent article in the surface sheet, the artificial menstrual blood injected into the surface sheet is From the main body of the absorbent article Without fall is, is all absorbed in the absorbent article.
Furthermore, the present invention provides a liquid-permeable top sheet, a liquid-impervious back sheet provided at a position facing the top sheet, an absorber provided between the top sheet and the back sheet, and a top sheet And a method for producing an absorbent article comprising a second sheet provided between the absorbent bodies, a step of preparing a second sheet for producing the second sheet, and an adhesive on the surface of the second sheet A step of applying, a step of preparing a sheet for a surface sheet for producing a surface sheet, and a sheet for the surface sheet and a sheet for the second sheet by laminating the sheet for the surface sheet on an adhesive application surface of the sheet for the second sheet The step of producing a composite sheet with the sheet, and the thickness at a temperature that is 50 ° C. lower than the melting point of the fiber of the top sheet and less than the melting point of the fiber of the top sheet A plurality of recesses of the heating compression to the seat surface sheet countercurrent to the inside of the sheet for the second sheet, and a step of forming the composite sheet.

According to the present invention, it is possible to provide an absorbent article, particularly a thin absorbent article, in which the body fluid discharged from the wearer is more difficult to leak.

FIG. 1 is a plan view of an absorbent article according to an embodiment of the present invention. 2A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 2B is a cross-sectional view in which a concave portion in FIG. 2A is enlarged. Drawing 3 is a figure for explaining a manufacturing method of an absorptive article in one embodiment of the present invention. FIG. 4 is a photomicrograph showing a cross section near the concave portion of the absorbent article produced by the method for manufacturing an absorbent article in one embodiment of the present invention. FIG. 5 is a diagram for explaining a test method of the absorption test during tilting. FIG. 6 is a diagram for explaining a test method of the absorption test during tilting.

Hereinafter, an absorbent article according to an embodiment of the present invention will be described with reference to the drawings. The absorbent article of one embodiment of the present invention is a thin sanitary napkin. Here, the thin sanitary napkin refers to a sanitary napkin having a thickness of 4 mm or less, for example. The thin absorbent article refers to an absorbent article having a thickness of 4 mm or less, for example.

1 and 2 are views for explaining an absorbent article according to an embodiment of the present invention. FIG. 1 is a plan view of an absorbent article according to an embodiment of the present invention. FIG. 2A is a cross-sectional view taken along the line AA in FIG. FIG. 2B is an enlarged cross-sectional view of the concave portion of FIG. The absorbent article 1 in one embodiment of the present invention includes a liquid-permeable top sheet 20, a liquid-impervious back sheet 30 provided at a position facing the top sheet 20, the top sheet 20, and the back sheet 30. And the second sheet 50 provided between the topsheet 20 and the absorber 40, and a region 61 provided on both sides in the width direction of the topsheet 20 and overlapping the topsheet 20. And a side seat 60. The top sheet 20 is bonded to the second sheet 50 using an adhesive.

The absorbent article 1 has a main body part 14 and a pair of wing parts 11 protruding in the width direction from the longitudinal center of the main body part 14. The boundary between the main body part 14 and the wing part 11 is the side 15 on the width direction side of the absorbent article 1 on one longitudinal end side with respect to the wing part 11 and the other side with respect to the wing part 11. It is the line 17 which tied the side 16 of the width direction side of the absorbent article 1 in the longitudinal direction end side. Therefore, the width of the main body 14 at the center in the longitudinal direction of the absorbent article 1 is the distance between the pair of lines 17. In addition, when an absorbent article does not have a wing part, the whole absorbent article becomes a main-body part.

The adhesive part 80 is provided on the surface on the opposite side in the surface facing the surface sheet 20 of the back surface sheet 30. In FIG. 1, the width direction of the absorbent article 1 is the x-axis direction, and the longitudinal direction is the y-axis direction. In FIG. 1, the planar direction of the absorbent article 1 is a direction in which a plane formed by the x-axis and the y-axis expands.

The absorbent article 1 is formed with a plurality of recesses 70 from the top sheet 20 to the inside of the second sheet 50 by heat compression in the thickness direction by pin embossing. Here, pin embossing is embossing performed using pins provided on the roller. The inner surface of the recess 70 is covered with the topsheet 20. Moreover, the absorbent article 1 has the seal part 12 formed by joining the top sheet 20, the second sheet 50, and the back sheet 30 by heating and compressing in the thickness direction on both sides in the longitudinal direction.

The top sheet 20 is a sheet that comes into contact with the wearer's skin when the absorbent article is worn. The top sheet 20 is preferably a non-woven fabric bonded by heating (for example, by a thermal bond method). For example, by heating a web containing heat-sealing fibers, the heat-sealing fibers in the web are softened, and a part of the fibers is melted to bond the fibers in the web together, thereby producing a nonwoven fabric. The heat-sealing fibers are classified into, for example, a single type and a composite type. Single-type heat-bonded fibers are fibers made of a single resin, and single-type heat-bonded fibers include polyethylene fibers, polypropylene fibers, unstretched polyester fibers, and polyethylene-vinyl acetate copolymer fibers. And PVC-acetate copolymer fibers.

The composite heat-sealing fiber is a heat-sealing fiber produced by combining a low melting point resin and a high melting point resin. The composite heat-sealing fiber includes a side-by-side type composite fiber and a core-sheath type composite fiber. Examples of the side-by-side type composite fiber include a combination of polyethylene and polypropylene, a combination of low melting point propylene and propylene, and the like. The core-sheath type composite fiber is made of polyethylene as the sheath and polypropylene as the core, polyethylene as the sheath and polyester as the core, low-melting polyester as the sheath and polyester as the core, low melting point as the sheath There are those using polypropylene as the core of polypropylene, those using polypropylene as the sheath and polyester as the core, and those using nylon-6 as the sheath and nylon 66 as the core.

It is preferable that the nonwoven fiber used for the topsheet 20 is a thermoplastic fiber. Thereby, since the deformation | transformation of the fiber of the surface sheet 20 produced when forming a recessed part in the absorbent article 1 is maintained even if the surface sheet 20 becomes a wet state, the recessed part 70 formed in the absorbent article 1 Can be made difficult to be crushed even when wet.

The second sheet 50 can diffuse the body fluid of the wearer discharged to the top sheet 20 and can increase the rigidity of the portion near the surface of the absorbent article 1. An airlaid nonwoven fabric is preferably used for the second sheet. An airlaid nonwoven fabric is a nonwoven fabric containing pulp produced by an airlaid method. The air lay method is generally a method in which pulp is mechanically loosened in a dry state, cellulose fibers are monofilamentized, and a web (pulp fiber mat) is continuously formed. This is a method of fixing the inside fibers together.

A heat-sealing fiber may be used for the binder of the airlaid nonwoven fabric used for the second sheet 50. As the binder of the air laid nonwoven fabric, for example, the same heat-sealable fiber that can be used for the nonwoven fabric of the topsheet 20 can be used. Since the heat-fusible fiber has thermoplasticity, the deformation of the fiber of the second sheet 50 that occurs when the concave portion is formed in the absorbent article 1 is maintained even when the topsheet 20 becomes wet. Therefore, even if the recessed part 70 formed in the absorbent article 1 becomes wet, it can be made difficult to be crushed. Moreover, as a binder of the airlaid nonwoven fabric used for the second sheet 50, both a heat-fusible fiber and a powdery, net-like, film-like or fibrous binder other than the heat-fusible fiber may be used.

Generally, since the rigidity of the air laid nonwoven fabric is higher than the rigidity of the top sheet 20, by providing the second sheet 50 including the air laid nonwoven cloth between the top sheet 20 and the absorbent body 40, the portion near the surface of the absorbent article can be obtained. Increases rigidity. As a result, the absorbent article 1 is deformed by a change in posture such as walking or sitting and sleeping, and the interior of the second sheet 50 is changed from the top sheet 20 by the deformation of the absorbent article 1. It is possible to prevent the second sheet 50 from being peeled off from the absorbent body 40 at the bottom portion of the recess 70 formed so far.

Moreover, since the airlaid nonwoven fabric is hydrophilic, the wearer's body fluid is absorbed quickly, and the body fluid discharged by the wearer is discharged before the surface fluid of the surface sheet 20 and / or the inside diffuses in the plane direction. The body fluid can be absorbed from the top sheet 20 and moved to the absorber 40. As a result, the absorbent article 1 is tilted by a change in posture such as walking or sitting and sleeping, and the diffusion of body fluid in the longitudinal direction or the width direction of the absorbent article 1 is accelerated. Even in the case that the body fluid leaks from the absorbent article 1, it can be suppressed.

Examples of the air laid nonwoven fabric used for the second sheet 50 include a nonwoven fabric made of chemical pulp, heat-sealing fibers, and a binder. The heat-sealing fiber is, for example, a core-sheath type composite fiber whose core is a polyester having a melting point of 250 to 260 ° C. and whose sheath is a polyethylene having a melting point of 115 to 130 ° C. The binder is, for example, an ethylene vinyl acetate binder.

The recess 70 provided from the top sheet 20 to the inside of the second sheet 50 is heated and compressed in the thickness direction at a temperature that is 50 ° C. lower than the melting point of the fibers of the top sheet 20 and less than the melting point of the fibers of the top sheet 20. Formed. The melting point of the fibers of the topsheet 20 is the melting point of the binder fibers that join the fibers of the topsheet 20 together. For example, when the fiber of the surface sheet 20 is a side-by-side type composite fiber, the melting point of the fiber of the surface sheet 20 is the melting point of the resin on the low melting point side of the composite fiber, and the fiber of the surface sheet 20 is the core sheath. In the case of the type composite fiber, the melting point of the top sheet 20 is the melting point of the resin in the sheath portion of the core-sheath type composite fiber.

For this reason, in the bottom part 13 of the recessed part 70, the fiber of the surface sheet 20 is not melted, and the shape of the fiber of the surface sheet 20 before being heated and compressed, that is, the linear shape of the fiber of the surface sheet 20 is maintained. Has been.

Therefore, the top sheet 20 is not thermally fused to the second sheet 50 at the bottom 13 of the recess 70. Here, the heat fusion means that when the surface sheet 20 and the second sheet 50 are heated and compressed in the thickness direction, a part or all of the heat fusion fibers in the surface sheet 20 are melted, and the surface sheet 20 It means that the heat-sealing fibers inside are bonded to the fibers of the second sheet 50. For example, when the heat-sealing fiber in the surface sheet 20 is a core-sheath type composite fiber, the heat-sealing refers to the sheath of the heat-sealing fiber when the surface sheet 20 and the second sheet 50 are heated and compressed in the thickness direction. This means that the heat-sealing fibers in the surface sheet 20 are bonded to the fibers of the second sheet 50.

Therefore, the top sheet 20 is not formed into a film at the bottom 13 of the recess 70, and the wearer's body fluid accumulated in the recess 70 quickly moves from the bottom 13 of the recess 70 to the absorber 40. Here, forming into a film means that the fibers of the surface sheet 20 are fused and the plurality of fibers of the surface sheet 20 are combined to form a porous or non-perforated film. Thereby, the time during which the wearer's body fluid stays in the recess 70 can be shortened. When the time staying in the recess 70 becomes longer, the body fluid staying in the recess 70 diffuses in the plane direction in the surface sheet 20 and / or the second sheet 50, and the body fluid is absorbed from the absorbent article 1. May leak. In addition, this causes the absorbent article 1 to tilt due to body movements such as walking and sitting and changes in posture such as sleeping, and diffusion of body fluids in the longitudinal direction or width direction of the absorbent article 1. Even when it becomes faster, it is possible to prevent body fluid from leaking from the absorbent article 1.

On the other hand, generally, when a recess is formed in the absorbent article by embossing, the surface sheet is formed into a film at the bottom of the recess. In this case, the liquid permeability of the bottom 13 of the recess 70 is reduced, and the time during which the wearer's body fluid stays in the recess 70 is increased. And the bodily fluid staying in the recess 70 may diffuse in the longitudinal direction or the width direction of the topsheet 20 and / or the second sheet 50, and the wearer's bodily fluid may leak from the absorbent article 1. . In particular, the absorbent article 1 tilted due to changes in posture such as walking and sitting and sleeping, etc., and diffusion of body fluid in the longitudinal direction or width direction of the absorbent article 1 was accelerated. When this happens, there is an increased risk of body fluid leaking from the absorbent article 1.

Further, since the top sheet 20 is not formed into a film at the bottom 13 of the recess 70, it is possible to suppress the top sheet 20 from becoming hard at the bottom 13 of the recess 70.

Also, in the recess 70, the fibers of the topsheet 20 are thermoplastically deformed. Thereby, even if the topsheet 20 and the second sheet 50 are in a wet state, the recess 70 is maintained.

The recess 70 formed from the top sheet 20 to the inside of the second sheet 50 is formed by, for example, pin embossing. The recesses 70 are preferably arranged in a staggered manner. The shape of the opening portion of the recess 70 in the planar direction is preferably circular. The arrangement of the recesses 70 is not limited to a staggered pattern, and may be, for example, a grid pattern. Further, the shape in the planar direction of the opening portion of the recess 70 is not limited to a circle. For example, the shape in the planar direction of the opening portion of the recess 70 may be other polygons such as a square, a rectangle, and a triangle, a star shape, and an oval shape. But you can. The sizes in the planar direction of the opening portions of the recesses 70 may all be the same, or may differ according to the position in the absorbent article 1. Moreover, all the depths of the recesses 70 may be the same or different depending on the position in the absorbent article 1.

The diameter of the opening in the planar direction of the recess 70 is, for example, 1.2 mm. In the recesses 70 arranged in a staggered manner, the distance (pitch) between the centers of the recesses 70 adjacent in the width direction is, for example, 3 mm, and the distance (pitch) between the centers of the recesses 70 adjacent in the longitudinal direction is For example, 2 mm.

As described above, the top sheet 20 is bonded to the second sheet 50 using an adhesive. Thereby, even when the topsheet 20 and the second sheet 50 are heated and compressed in the thickness direction at a temperature at which the topsheet 20 is not thermally fused to the second sheet 50, the topsheet 20 is prevented from peeling from the second sheet 50. can do.

The adhesive for joining the top sheet 20 to the second sheet 50 is preferably a pressure sensitive adhesive. Examples of pressure-sensitive adhesives include thermoplastic polymers such as styrene block polymers, natural or synthetic resin tackifier resins, and plastic materials such as paraffinic oil. Styrene block polymers include styrene-ethylene-butadiene-styrene block copolymer (SEBS), styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene- And ethylene-propylene-styrene copolymer (SEPS). Natural resin-based tackifier resins include terpene resins that are copolymers of α-pinene, β-pinene, or dipentene, rosin-based resins that are gum rosin, tall oil rosin, or wood rosin, or hydrogenated products and esters thereof. Is mentioned. Synthetic resin-based tackifier resins include aliphatic (C5) petroleum resins, aromatic (C9) petroleum resins, copolymerized petroleum resins, hydrogenated petroleum resins, DCPD petroleum resins, pure Monomer-based petroleum resins and the like can be mentioned. Examples of the plastic material include a paraffin oil system that lowers viscosity, a naphthenic oil that increases tackiness, and an aroma oil that reduces cohesion and imparts color and odor.

Further, the adhesive may be uniformly applied to the top sheet 20 or the second sheet 50, or may be applied in a predetermined pattern. The coating pattern of the adhesive on the top sheet 20 or the second sheet 50 is arranged in parallel with a predetermined interval in the width direction, parallel line patterns extending in the longitudinal direction, and parallel in the width direction. There are a belt-like pattern extending in the direction, a wave-like pattern in which the amplitude is in the width direction and wavy lines extending in the longitudinal direction are arranged in parallel in the width direction, and a spiral pattern in which spirals extending in the longitudinal direction are arranged in the width direction. Coating basis weight of the adhesive is preferably 1 ~ 10g / m ^2. Thereby, the adhesive is distributed throughout, and the hard feeling of the absorbent article 1 due to the presence of the adhesive can be reduced, and the feeling of use of the absorbent article 1 is improved.

The back sheet 30 is a sheet for suppressing body fluid from the wearer absorbed by the absorber 40 from leaking outside in the thickness direction. The back sheet 30 may be a film mainly composed of polyethylene, polypropylene, or the like, a breathable resin film, or a sheet obtained by bonding a breathable resin film to a nonwoven fabric such as spunbond or spunlace. The back sheet 30 preferably has a degree of flexibility that does not cause the wearer to feel uncomfortable at the time of wearing.

As described above, the seal portions 12 are provided on both sides of the absorbent article 1 in the longitudinal direction. The seal portion 12 is formed by heat-compressing the top sheet 20, the second sheet 50, and the back sheet 30 in the thickness direction by heat embossing or the like. In the seal portion 12, the top sheet 20, the second sheet 50, and the back sheet 30 are joined.

The absorber 40 absorbs and holds the body fluid discharged from the wearer. It is preferable that the absorber 40 is bulky, does not easily lose its shape, and has little chemical stimulation. As the absorbent body 40, for example, an absorbent body made of fluffy pulp or air laid nonwoven fabric and a super absorbent polymer (SAP) can be used. In place of the fluffy pulp, for example, artificial cellulose fibers such as chemical pulp, cellulose fiber, rayon and acetate may be used for the absorbent body. The absorbent body in which the absorbent fibers and the superabsorbent polymer are uniformly distributed as a whole may be covered with a liquid-permeable material such as a tissue. Examples of the airlaid nonwoven fabric used for the absorbent body 40 include a nonwoven fabric in which pulp and heat-sealing fibers are heat-sealed or pulp is fixed with a binder. Water-soluble polymer has a moderately crosslinked three-dimensional network structure and absorbs 30 to 60 times the water, but is essentially water-insoluble, and once absorbed, the water does not release even when a certain pressure is applied. It is preferable to use a superabsorbent polymer as a superabsorbent polymer used for the absorber 40. Examples of the superabsorbent polymer include starch-based, acrylic acid-based, and amino acid-based particulate or fibrous polymers. The shape and structure of the absorber can be varied as required. Further, the size and absorption capacity of the absorber are changed according to the application.

The surface of the absorber 40 on the second sheet 50 side is preferably substantially flat. Thereby, the diffusion of the body fluid in the longitudinal direction or the width direction of the absorbent article 1 is accelerated by a part of the topsheet 20 and the second sheet 50 being inclined with respect to the plane surface of the absorbent article 1. Can be suppressed. On the other hand, when a step or a raised portion is provided on the surface of the absorbent body 40 on the second sheet 50 side, the inclination of the surface sheet 20 and a part of the second sheet 50 with respect to the plane surface of the absorbent article 1 is increased. There is a possibility that the body fluid may leak from the longitudinal direction or the width direction of the absorbent article 1.

The size of the absorbent body 40 in the planar direction of the absorbent article 1 is smaller than the size of the top sheet 20, the second sheet 50, and the back sheet 30 in the planar direction of the absorbent article 1. In addition, the existence area of the absorbent body 40 in the planar direction of the absorbent article 1 is inside the existence area of the top sheet 20, the second sheet 50, and the back sheet 30 in the planar direction of the absorbent article 1. However, the size of the absorbent body 40 in the planar direction of the absorbent article 1 may be the same as the size of the top sheet 20, the second sheet 50, or the back sheet 30 in the planar direction of the absorbent article 1.

The seal portion 12 is provided on the outer side in the longitudinal direction of the longitudinal end of the absorber 40. Thereby, the bodily fluid which cannot be absorbed by the absorbent body 40 and is diffused is blocked by the seal portion 12, and the bodily fluid can be prevented from leaking from the longitudinal direction of the absorbent article 1.

The side sheet 60 is provided on both sides in the width direction of the top sheet 20 and extends in the longitudinal direction. The side sheet 60 has a region 61 that overlaps the top sheet 20. An end 62 on the inner side in the width direction of the side sheet 60 is not fixed to the top sheet 20 and is a free end. Thereby, when the wearer wears the absorbent article 1, the portion of the end 62 on the inner side in the width direction of the side sheet 60 stands up, and the leakage barrier for preventing body fluid from leaking to the outside of the absorbent article 1. Form. The side sheet 60 preferably has hydrophobicity or water repellency. For the side sheet 60, for example, a spunbond nonwoven fabric or an SMS nonwoven fabric is used. Further, since the side sheet 60 comes into contact with the skin of the wearer, it is preferable to use an air-through non-woven fabric that can reduce the irritation to the skin for the side sheet 60.

As described above, the adhesive portion 80 is provided on the opposite surface of the back sheet 30 facing the top sheet 20. The adhesive part 80 fixes the absorbent article 1 to underwear such as a sheet. The pressure-sensitive adhesive portion 80 is formed by applying a pressure-sensitive adhesive. Examples of the pressure-sensitive adhesive for forming the pressure-sensitive adhesive portion 80 include thermoplastic polymers such as styrene-based block polymers, natural or synthetic resin-based tackifier resins, and plastic materials such as paraffinic oil. .

Next, with reference to FIG. 3, the outline of the manufacturing method of the absorbent article 1 in one embodiment of the present invention will be described. The absorbent 222, which is a mixture of pulverized pulp and superabsorbent polymer, is supplied to the pattern drum 220 from a pulverized pulp supply device (not shown). A recess 224 is formed on the outer periphery of the pattern drum 220 as a mold for filling the absorbent material. The inside of the pattern drum 220 is sucked 226, and the absorbent 222 supplied to the pattern drum 220 is sucked into the recess 224. Then, the absorbent material 222 is compressed and molded into the absorbent body 228, whereby the absorbent body 228 is produced. The manufactured absorber 228 is cut into a predetermined shape by an absorber cutter (not shown).

Next, a band-shaped surface sheet-second sheet composite sheet 262 is disposed under the absorber 228. The top sheet-second sheet composite sheet 262 is a composite sheet in which a top sheet for producing the top sheet 20 and a second sheet for producing the second sheet 50 are overlapped. The top sheet-second sheet composite sheet 262 has recesses formed from the top sheet to the inside of the second sheet. A method for producing the topsheet-second sheet composite sheet 262 will be described later.

A pair of strip-shaped side sheet 272 for producing the side sheet 60 is supplied from the side sheet roll 270. The pair of supplied side sheet sheets 272 are laminated on both sides in the width direction of the top sheet-second sheet composite sheet 262 so as to partially overlap the top sheet for the top sheet-second sheet composite sheet 262.

Next, a strip-shaped back sheet 282 is supplied from a back sheet roll 280 on which a back sheet for producing the back sheet 30 is wound. Then, the back sheet 282 is laminated on the top sheet-second sheet composite sheet 262 so that the back sheet 282 and the top sheet-second sheet composite sheet 262 sandwich the absorber 228. In this way, a continuous body 268 of absorbent articles is formed. After forming a seal portion in the absorbent article continuous body 268 with a round seal device (not shown), the absorbent article continuous body 268 is cut into a shape of the absorbent article using the cutter 290 and absorbed. A product 1 is produced.

In addition, a liquid-permeable surface sheet, a liquid-impermeable back sheet provided at a position facing the surface sheet, an absorber provided between the surface sheet and the back sheet, the surface sheet and the absorption If the absorbent article provided with the second sheet provided between the bodies can be manufactured, the manufacturing method of the absorbent article is not limited to the above-described manufacturing method.

Next, with reference to FIG. 3, an outline of a method for producing the topsheet-second sheet composite sheet 262 will be described. A belt-shaped second sheet 232 is supplied from a second sheet roll 230 around which a second sheet for producing the second sheet 50 is wound. The pressure sensitive adhesive 242 is applied to the surface of the second sheet 232 using the adhesive application device 240. Examples of the adhesive coating apparatus 240 include a contact coater such as a slot coater, and a non-contact coater such as a spray coater, a curtain coater, and a spiral coater.

A belt-like surface sheet 252 is supplied from a surface sheet roll 250 on which a surface sheet for producing the surface sheet 20 is wound. The supplied surface sheet 252 is laminated on the application surface of the pressure sensitive adhesive 242 of the second sheet 232.

The composite sheet 254 in which the surface sheet 252 is laminated on the second sheet 232 is supplied to the embossing device 260. In the embossing apparatus 260, the surface sheet 252 is heated and compressed in the thickness direction at a temperature that is 50 ° C. lower than the melting point of the fibers of the top sheet 252 and less than the melting point of the fibers of the top sheet 252. To the inside of the second sheet 232 are formed in the composite sheet 254. When the temperature at which the composite sheet 254 is heated and compressed is lower than the temperature lower by 50 ° C. than the melting point of the fibers of the top sheet 252, the fibers of the top sheet 252 may not be thermoplastically deformed. In some cases, it is difficult to maintain the shape of the recess formed on the surface. In this case, when the wearer's body pressure is applied to the absorbent article, the plurality of recesses formed from the top sheet to the inside of the second sheet are crushed, and the absorption of the body fluid of the absorbent article is delayed. Or body fluid may easily spread in the absorbent article. When the temperature at which the composite sheet 254 is heated and compressed is equal to or higher than the melting point of the fibers of the surface sheet 252, the bottom portion of the recess formed in the composite sheet 254 becomes a film, or the surface sheet becomes hard There is. When the bottom portion of the recess is formed into a film, the absorption speed of the body fluid collected in the recess may be slow, or the body fluid collected in the recess may diffuse and the body fluid may easily leak from the absorbent article.

The melting point of the fibers of the top sheet 252 is the melting point of the binder fibers that join the fibers of the top sheet 252 together. For example, when the fiber of the surface sheet 252 is a side-by-side type composite fiber, the melting point of the fiber of the surface sheet 252 is the melting point of the resin on the low melting point side of the composite fiber. When the fiber 252 is a core-sheath type composite fiber, the melting point of the fiber of the top sheet 252 is the melting point of the resin in the sheath part of the core-sheath type composite fiber.

The embossing device 260 includes an upper roll 264 and a lower roll 266. The upper roll 264 is an engraving roll provided with a plurality of pins protruding in the radial direction on the outer peripheral surface. The lower roll 266 is a plain roll having a smooth outer peripheral surface. The lower roll 266 may be a female engraving roll of the upper roll 264. Further, the lower roll 266 may be an elastic roll.

The upper roll 264 and the lower roll 266 can be heated. Examples of the method for heating the upper roll 264 and the lower roll 266 include an electric heating method, an induction heating method, a heat circulation heating method, a steam heating method, and a gas heating method. If the composite sheet 254 can be heated and compressed in the thickness direction, only one of the upper roll 264 and the lower roll 266 may be heated.

If a plurality of recesses from the top sheet 252 to the inside of the second sheet 232 can be formed in the composite sheet 254 by heat compression in the thickness direction, the method of forming the recesses in the composite sheet 254 is roll embossing. It is not limited to processing. For example, the concave portion may be formed in the composite sheet 254 by flat plate embossing, high frequency embossing, or ultrasonic embossing.

For example, the surface temperature of the upper roll 264 and the lower roll 266 is set to a temperature that is 50 ° C. lower than the melting point of the fibers of the top sheet 252 and lower than the melting point of the fibers of the top sheet 252. The composite sheet 254 can be heated and compressed in the thickness direction at a temperature that is 50 ° C. lower than the melting point of the fibers of the sheet 252 and lower than the melting point of the fibers of the top sheet 252. For example, when the fiber of the surface sheet 252 is a core-sheath type composite fiber, the core is polyester having a melting point of 250 to 260 ° C., and the sheath is polyethylene having a melting point of 115 to 130 ° C., the upper roll The surface temperature of H.264 and the lower roll 266 is, for example, 60 ° C. or higher and lower than 120 ° C.

When the composite sheet 254 passes between the upper roll 264 and the lower roll 266, a concave portion is formed in the composite sheet 254 by the heated pin of the upper roll 264. Since the temperature of the pins of the upper roll 264 and the temperature of the lower roll 266 is lower than the melting point of the fibers of the top sheet 252, the fibers of the top sheet 252 of the composite sheet 254 are formed at the bottom of the formed recess. The surface sheet 252 of the composite sheet 254 does not melt and does not melt. Further, the temperatures of the pins of the upper roll 264 and the lower roll 266 are not less than 50 ° C. lower than the melting point of the fibers of the sheet 252 for the top sheet, so that when the composite sheet 254 is inserted into the pins, The fibers of the sheet 252 are softened and deformed, and the deformation of the fibers of the top sheet 252 is maintained even after the composite sheet 254 passes between the upper roll 264 and the lower roll 266.

When the composite sheet 254 passes through the embossing device 260, a top sheet-second sheet composite sheet 262 in which a recess from the top sheet to the inside of the second sheet is formed. As described above, the produced topsheet-second sheet composite sheet 261 is disposed under the absorber 228 in the next step.

FIG. 4 shows a photomicrograph showing a cross section in the vicinity of the recess 70 of the absorbent article 1 produced by the above manufacturing method. The fibers of the topsheet 20 are core-sheath type composite fibers whose core is a polyester having a melting point of 250 to 260 ° C. and whose sheath is a polyethylene having a melting point of 115 to 130 ° C. Second sheet 50 is a chemical pulp, a core-sheath type composite fiber whose core is a polyethylene having a melting point of 250-260 ° C., and whose sheath is a melting point of 115-130 ° C., an ethylene vinyl acetate binder, Consists of. The temperature when the topsheet 20 and the second sheet 50 were heated and compressed in the thickness direction by embossing was 100 ° C. As shown in FIG. 4, the linear shape of the fibers of the topsheet 20 is maintained at the bottom 13 of the recess 70. Moreover, in the recessed part 70, it turns out that the fiber of the surface sheet 20 is bent and is thermoplastically deformed. Furthermore, the fibers of the topsheet 20 are not melted at the bottom 13 of the recess 70, and the topsheet 20 is not thermally fused with the second sheet. And in the bottom part 13 of the recessed part 70, the surface sheet 20 is not film-formed.

The above description is merely an example, and the invention is not limited to the above embodiment.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

The absorption test during tilting was performed on the examples and comparative examples. The tilt absorption test is a test in which a predetermined amount of artificial menstrual blood is injected into a sample tilted with respect to a horizontal plane to check whether artificial menstrual blood leaks from the sample. By tilting the sample, artificial menstrual blood injected into the sample is likely to leak from the end in the width direction or the end in the longitudinal direction of the sample due to gravity. Therefore, by examining how much the artificial menstrual blood leaks from the sample by the absorption test during tilting, it is possible to determine how much the body fluid is difficult to leak. Moreover, during wearing of an absorbent article, an absorbent article inclines with a wearer's attitude | position and movement. Therefore, by performing the absorption test at the time of inclination, it is possible to determine whether the body fluid is difficult to leak even when the wearer changes posture or when the wearer moves. . Hereinafter, the method of the absorption test during tilt will be described in detail with reference to FIGS.

(Inclination absorption test)
As shown in FIG. 5, the sample 420 is arranged on the plate 420 inclined by a predetermined angle (θ) with respect to the horizontal plane 440 so that the back sheet is on the plate side along the flat surface of the plate 420. . Hereinafter, the angle (θ) of the plate 420 with respect to the horizontal plane 440 is referred to as a “plate inclination angle”. As shown in FIG. 6A, the sample 410 is arranged such that the longitudinal direction of the sample 410 is perpendicular to the horizontal plane 440, or as shown in FIG. The sample was arranged so that the direction was parallel to the horizontal plane 440, that is, the longitudinal direction of the sample 410 was horizontal. When the sample 410 slides down from the plate 420, the sample 410 was fixed to the plate 420 using an adhesive. The wing part 11 of the sample 410 was bent toward the plate 420 side. The tip (burette tip diameter: 1.3 mm) of the auto burette 430 (manufactured by Metrohm, multi-digimat 776) is brought into contact with the center position 412 in the longitudinal direction and the width direction of the sample, and a predetermined amount is obtained from the auto burette 430. Of artificial menstrual blood was injected into the sample at a predetermined injection rate. Among the injected artificial menstrual blood, the artificial menstrual blood that flowed down from the sample and leaked from the sample was collected in a petri dish 450 disposed below the plate 420.

The amount of artificial menstrual blood absorbed in the sample 410 was calculated by subtracting the weight of the sample 410 before injecting artificial menstrual blood from the weight of the sample 410 after injecting artificial menstrual blood. Alternatively, the amount of artificial menstrual blood leaked from the sample was calculated by subtracting the weight of the empty petri dish 450 from the weight of the petri dish 450 after collecting the artificial menstrual blood. Artificial menstrual blood used in the absorption test at the time of inclination is 80 g of glycerin (Wako Pure Chemical Industries, Ltd., Wako First Grade), 8 g of sodium carboxymethylcellulose (NaCMC) (chemicals manufactured by Wako Pure Chemical Industries, Ltd.), sodium chloride ( NaCl) (special grade reagent manufactured by Wako Pure Chemical Industries, Ltd.) 10 g, sodium hydrogen carbonate (NaHCO ₃ ) (Wako first grade manufactured by Wako Pure Chemical Industries, Ltd.) 4 g, food color preparation (manufactured by Koyo Product Co., Ltd.): red It was prepared by mixing 102 g of No. 102, 2 g of Red No. 2 and 2 g of Yellow No. 5 in 1000 cc of ion-exchanged water and dissolving.

In order to investigate a suitable temperature range when forming a plurality of recesses from the top sheet to the inside of the second sheet, the absorption speed and the width of the absorbent article in the absorbent article of artificial menstrual blood injected in the absorption test during inclination The directional diffusion length was examined.

(Absorption rate)
The time until the artificial menstrual blood disappeared from the surface of the surface sheet by being absorbed from the surface sheet after the injection of the artificial menstrual blood was started in the absorption test at the time of inclination was measured. This measured time is the absorption rate (seconds).

(Diffusion length)
In the diffusion region of artificial menstrual blood injected by the absorption test at the time of inclination, the distance between the position of the longitudinal end of the absorbent article in the diffusion region of artificial menstrual blood and the injection position of artificial menstrual blood becomes the diffusion length .

(sample)
Next, the sample used for the absorption test at the time of inclination is demonstrated. There are two types of samples, a sample composed of a top sheet and a second sheet, and a sample of an absorbent article. Samples comprising the top sheet and the second sheet are Example 1 and Comparative Examples 1 to 5, and samples of the absorbent article are Examples 2 to 5 and Comparative Examples 6 to 13.

In Examples 1 to 5 and Comparative Examples 6 to 8, recesses were formed in the top sheet and the second sheet by heating and compressing for 2 seconds by the plate embossing method. When mass-producing an absorbent article, a recessed part may be formed in a surface sheet and a 2nd sheet | seat by the method of roll embossing. In this case, it is preferable to heat-compress the top sheet and the second sheet at a higher temperature and in a shorter time than in the case of the plate embossing method.

(Sample consisting of a surface sheet and a second sheet)
(1) Example 1
Sample thickness: 1.00 mm
The thickness of the sample was measured using a PEACOCK thickness gauge under a load of 3.0 gf / cm ² . same as below.
(A) Top sheet basis weight: 25 g / m ²
Thickness: 0.5mm
Size: 85mm x 230mm
Material: Non-woven fabric containing core-sheath type composite fiber whose core is a polyester having a melting point of 250-260 ° C. and whose sheath is a polyethylene having a melting point of 115-130 ° C.
Fineness: 2.8 dtex
(B) Second sheet basis weight: 40 g / m ²
Thickness: 0.4-0.8mm
Size: 55mm x 230mm
Material: Airlaid comprising a core-sheath type composite fiber which is a chemical pulp, a polyester whose core has a melting point of 250 to 260 ° C., and whose sheath has a melting point of 115 to 130 ° C., and an ethylene vinyl acetate binder. Non-woven fabric.
(C) Concave part Concave pattern: Staggered pattern Concave hole diameter: 1.2 mm
Longitudinal pitch: 2 mm
Width direction pitch: 3mm
Heat compression temperature: 100 ° C
Heat compression time: 2 seconds (d) Adhesive for bonding the top sheet and the second sheet Material: Styrene hot melt adhesive Application amount: 5 g / m ²

(2) Comparative Example 1

(3) Comparative Example 2

(4) Comparative Example 3
A sample made of a surface sheet taken from the product “Seventh Space Girl Series Pure Day” for Heng An Group Co., Ltd.
Sample thickness: 0.80mm
(A) Surface sheet Material: Spunlace nonwoven fabric.

(5) Comparative Example 4
Sample consisting of a top sheet and a second sheet taken from Unicharm Co., Ltd. product “Center-in-Compact Fluffy Daytime”.
Sample thickness: 2.00 mm
(A) Surface sheet basis weight: 30 g / m ²
Thickness: 0.7mm
Size: 85mm x 240mm
Material: Non-woven fabric containing core-sheath type composite fiber whose core is polyester and whose sheath is polyethylene.
(B) Second sheet basis weight: 65 g / m ²
Thickness: 0.5-0.9mm
Size: 67mm x 215mm
Material: The upper layer is a non-woven fabric of core-sheath type composite fiber whose core is polyester and the sheath is polyethylene, and the lower layer is chemical pulp and polyester whose core has a melting point of 250-260 ° C., and the sheath has a melting point A composite airlaid nonwoven fabric comprising a core-sheath type composite fiber, which is polyethylene having a melting point of 115 to 130 ° C., and an ethylene vinyl acetate binder.
(C) Adhesive for bonding the top sheet and the second sheet Material: Styrene hot melt adhesive Application amount: 1.5 g / m ²
Application pattern: Spiral

(6) Comparative Example 5

(Sample of absorbent article)
(1) Example 2
Sample center thickness: 2.93 mm
(A) Top sheet Same as Example 1.
(B) Second sheet Same as Example 1.
(C) Recessed portion Heat compression temperature: 80 ° C
Other than that, the same as Example 1.
(D) Adhesive for adhering the top sheet and the second sheet Same as Example 1 (e) Absorbent Material: Mixture of ground pulp and SAP (acrylic superabsorbent polymer) with tissue (weight per unit: 15 g / m ² ) Sandwich weight: 250-300 g / m ² (both ends in the longitudinal direction)
350 to 400 g / m ² (center in the longitudinal direction)
Thickness: 1.35 to 1.45 mm (both ends in the longitudinal direction)
1.5mm (center in the longitudinal direction)

(2) Example 3
Sample thickness: Same as Example 2.
(A) Top sheet The same as in Example 2.
(B) Second sheet Same as Example 2.
(C) Concave portion Heat compression temperature: 100 ° C
Other than that, the same as Example 2.
(D) Adhesive for adhering the top sheet and the second sheet The same as in Example 2.
(E) Absorber Same as Example 2.

(3) Example 4
Sample thickness: Same as Example 2.
(A) Top sheet The same as in Example 2.
(B) Second sheet Same as Example 2.
(C) Concave part Heat compression temperature: 110 degreeC
Other than that, the same as Example 2.
(D) Adhesive for adhering the top sheet and the second sheet The same as in Example 2.
(E) Absorber Same as Example 2.

(4) Example 5
Sample thickness: Same as Example 2.
(A) Top sheet The same as in Example 2.
(B) Second sheet Same as Example 2.
(C) Recessed portion Heat compression temperature: 120 ° C
Other than that, the same as Example 2.
(D) Adhesive for adhering the top sheet and the second sheet The same as in Example 2.
(E) Absorber Same as Example 2.

(5) Comparative Example 6
Sample thickness: Same as Example 2.
(A) Top sheet The same as in Example 2.
(B) Second sheet Same as Example 2.
(C) Concave part Heat compression temperature: No heating.
Other than that, the same as Example 2.
(D) Adhesive for adhering the top sheet and the second sheet The same as in Example 2.
(E) Absorber Same as Example 2.

(6) Comparative Example 7
Sample thickness: Same as Example 2.
(A) Top sheet The same as in Example 2.
(B) Second sheet Same as Example 2.
(C) Recessed portion Heat compression temperature: 60 ° C
Other than that, the same as Example 2.
(D) Adhesive for adhering the top sheet and the second sheet The same as in Example 2.
(E) Absorber Same as Example 2.

(7) Comparative Example 8
Sample thickness: Same as Example 2.
(A) Top sheet The same as in Example 2.
(B) Second sheet Same as Example 2.
(C) Recessed portion Heat compression temperature: 130 ° C
Other than that, the same as Example 2.
(D) Adhesive for adhering the top sheet and the second sheet The same as in Example 2.
(E) Absorber Same as Example 2.

(8) Comparative Example 9

(9) Comparative Example 10

(10) Comparative Example 11
Product made by Heng An Group Co., Ltd.
Sample center thickness: 4.35 mm
(A) Top sheet Same as Comparative Example 3.
(B) Second sheet Same as Comparative Example 3 (c) Absorber Material: Sandwich of a mixture of pulp and SAP with a tissue (weight: 19 g / m ² ) Weight: 300 g / m ²
Thickness: 3mm

(11) Comparative Example 12
Product made by Unicharm Co., Ltd. “Center in compact fluffy daytime”
Sample center thickness: 7.05 mm
(A) Surface sheet Same as Comparative Example 4 (b) Second sheet Same as Comparative Example 4 (c) Adhesive for adhering the surface sheet and second sheet Same as Comparative Example 4 (e) Absorber Material: Upper part is ground pulp Sandwiched with a tissue (weight per unit: 13.5 g / m ² ). The lower row is an SAP sheet.

(12) Comparative Example 13

(result)
The sample is arranged so that the inclination angle of the plate is 90 °, the longitudinal direction of the sample is perpendicular to the horizontal plane, and the inclined surface sheet when 3 ml of artificial menstrual blood is injected at an injection rate of 7 ml / min. Table 1 below shows the results of the absorption test when the sample made of the second sheet is inclined.

The sample is arranged so that the inclination angle of the plate is 45 °, the longitudinal direction of the sample is perpendicular to the horizontal plane, and the inclined angle surface sheet when 3 ml of artificial menstrual blood is injected at an injection rate of 7 ml / min; Table 2 below shows the results of the absorption test when the sample made of the second sheet is tilted.

The sample is arranged so that the inclination angle of the plate is 45 °, and the longitudinal direction of the sample is horizontal, and is composed of an inclined angle surface sheet and a second sheet when 3 ml of artificial menstrual blood is injected at an injection rate of 7 ml / min. The results of the absorption test when the sample is tilted are shown in Table 3 below.

The sample is placed so that the inclination angle of the plate is 10 °, the longitudinal direction of the sample is perpendicular to the horizontal plane, and the inclined surface sheet when 3 ml of artificial menstrual blood is injected at an injection rate of 96 ml / min; Table 4 below shows the results of the absorption test when the sample made of the second sheet was tilted.

The sample is arranged so that the inclination angle of the plate is 10 °, and the longitudinal direction of the sample is horizontal, and is composed of a surface sheet and a second sheet with an inclination angle when 3 ml of artificial menstrual blood is injected at an injection rate of 96 ml / min. The results of the absorption test when the sample is tilted are shown in Table 5 below.

Sample of the absorbent article when the inclination angle of the plate is 10 °, the sample is arranged so that the longitudinal direction of the sample is perpendicular to the horizontal plane, and 3 ml of artificial menstrual blood is injected at an injection rate of 96 ml / min Table 6 below shows the results of the absorption test during tilting.

Absorbing the sample of the absorbent article when the sample is placed at an inclination angle of 10 °, the sample is arranged so that the longitudinal direction of the sample is horizontal, and 3 ml of artificial menstrual blood is injected at an injection rate of 96 ml / min. The test results are shown in Table 7 below.

Absorbing the sample of the absorbent article when the sample is placed at an inclination angle of 10 °, the sample is arranged so that the longitudinal direction of the sample is horizontal, and 7 ml of artificial menstrual blood is injected at an injection rate of 96 ml / min. The test results are shown in Table 8 below.

For samples (Examples 2 to 5 and Comparative Examples 6 to 8) in which the temperature when heated and compressed to form a recess in the top sheet and the second sheet was changed, the inclination angle of the plate was set to 10 °, and the longitudinal direction of the sample Table 9 below shows the results of the absorption rate and diffusion length of the sample of the absorbent article when the sample was placed in a horizontal position and 3 ml of artificial menstrual blood was injected at an injection rate of 96 ml / min.

From the above absorption test at the time of inclination, as shown in Table 8, in Example 3 which is one of the absorbent articles in one embodiment of the present invention and Comparative Examples 9 to 13 which are conventional absorbent articles. In Example 3 only, the absorbent in the top sheet was placed on a plate inclined 10 ° with respect to the horizontal plane so that the longitudinal direction of the absorbent article was horizontal along the flat surface of the plate. When 7 ml of artificial menstrual blood is injected into the center in the longitudinal direction and the width direction of the article at an injection speed of 96 ml / min, the artificial menstrual blood injected into the top sheet flows down from the absorbent article with the wings folded. Without being absorbed into the absorbent article. Therefore, when the width of the absorbent article is 10 cm, the absorbent article is arranged on a plate inclined by 10 ° with respect to the horizontal plane so that the longitudinal direction of the absorbent article is horizontal along the flat surface of the plate. When 7 ml of artificial menstrual blood is injected at the center of the absorbent article in the longitudinal direction and width direction of the surface sheet at a rate of 96 ml / min, the artificial menstrual blood injected into the surface sheet From the folded absorbent article, that is, the absorbent article that is completely absorbed by the absorbent article without flowing down from the main body, and the absorbent article according to the present invention can be specified.

As shown in Table 9, from the above absorption test at the time of inclination, 80 ° C., 100 ° C., 110 ° C., which is a temperature that is 50 ° C. lower than the melting point of the fiber of the top sheet and less than the melting point of the fiber of the top sheet. By absorbing and compressing body fluid in the absorbent article by forming a plurality of recesses from the top sheet to the inside of the second sheet by heating and compressing in the thickness direction at a temperature of 120 ° C., diffusion of the body fluid in the absorbent article It was found that can be reduced. In Comparative Example 6, although the absorption was fast and the diffusion was relatively small, the concave portions could not be reliably formed in the top sheet and the second sheet. Further, from Table 9, it was found that the optimum temperature when heating and compressing by the plate embossing method was 80 ° C. Therefore, when mass-producing an absorbent article by the roll embossing method, it turned out that it is preferable to heat-compress at a temperature higher than 80 degreeC, for example, 100 degreeC, for a time shorter than 2 second.

DESCRIPTION OF SYMBOLS 1 Absorbent article 11 Wing part 12 Sealing part 13 Recess bottom 20 Top sheet 30 Back sheet 40 Absorber 50 Second sheet 60 Side sheet 62 Side sheet width side inner end 70 Recess 80 Adhesive part 220 Pattern drum 230 Second sheet roll 240 Adhesive Coating Device 250 Top Sheet Roll 260 Embossing Device 262 Top Sheet-Second Sheet Composite Sheet 264 Upper Roll 266 Lower Roll 270 Side Sheet Roll 280 Back Sheet Roll 290 Cutter

Claims

A liquid-permeable surface sheet;
A liquid-impermeable back sheet provided at a position facing the top sheet;
An absorber provided between the top sheet and the back sheet;
A second sheet provided between the top sheet and the absorber,
A plurality of recesses are formed from the top sheet to the inside of the second sheet by heat compression in the thickness direction,
In the recess, the fiber of the topsheet is thermoplastically deformed, and the bottom of the recess maintains the linear shape of the fiber of the topsheet,
The top sheet is bonded to the second sheet using an adhesive,
The second sheet is an absorbent article including an airlaid nonwoven fabric having pulp.
The absorbent article according to claim 1, wherein the air-laid nonwoven fabric further includes a heat-sealing fiber.
The absorbent article according to claim 1 or 2, wherein a surface of the absorbent body on the second sheet side is substantially flat.
A pair of liquid-impervious side sheets provided on both sides in the width direction of the top sheet and having a region overlapping the top sheet;
The absorbent article according to any one of claims 1 to 3, wherein an end on the inner side in the width direction of the side sheet is a free end.
A seal portion that heat-compresses in the thickness direction and joins the top sheet, the second sheet, and the back sheet is provided on both sides in the longitudinal direction on the outside in the longitudinal direction of the longitudinal end of the absorber. The absorbent article according to any one of the above.
A liquid-permeable surface sheet;
A liquid-impermeable back sheet provided at a position facing the top sheet;
An absorber provided between the top sheet and the back sheet;
An absorbent article comprising a second sheet provided between the top sheet and the absorber,
Having a body part,
A plurality of recesses are formed from the top sheet to the inside of the second sheet,
When the width of the main body in the width direction at the center in the longitudinal direction of the absorbent article is 10 cm, the absorbent article is placed on a plate inclined by 10 ° with respect to a horizontal plane along the flat surface of the plate. When the artificial menstrual blood is injected at a rate of 96 ml / min into the center position in the longitudinal direction and the width direction of the absorbent article in the surface sheet, the longitudinal direction is arranged so that the longitudinal direction is horizontal, The absorbent article in which the artificial menstrual blood injected into the top sheet is completely absorbed by the absorbent article without flowing down from the main body of the absorbent article.
A liquid-permeable top sheet, a liquid-impervious back sheet provided at a position facing the top sheet, an absorber provided between the top sheet and the back sheet, the top sheet, and the top sheet In the manufacturing method of an absorbent article provided with a second sheet provided between the absorbers,
Preparing a sheet for a second sheet for producing the second sheet;
Applying an adhesive to the surface of the second sheet,
Preparing a sheet for a surface sheet for producing the surface sheet;
Laminating the sheet for the top sheet on the adhesive application surface of the sheet for the second sheet to produce a composite sheet of the sheet for the top sheet and the sheet for the second sheet;
From the surface sheet to the inside of the second sheet by heating and compressing in the thickness direction at a temperature of 50 ° C. lower than the melting point of the fiber of the surface sheet and lower than the melting point of the fiber of the surface sheet. And a step of forming a plurality of recesses in the composite sheet.