JP2020151341A - Absorbent article and manufacturing method of the same - Google Patents

Abstract

To provide an absorbent article which prevents soft touch feeling of cotton from lowering, improves absorption efficiency and is less likely to cause return, and to provide a manufacturing method of the same.SOLUTION: A top sheet comprises a multilayer structure including a non-thermal adhesive layer 10 comprising cellulosic fibers arranged at a skin side, and a thermal adhesive layer 11 comprising long thermal adhesive fibers arranged at a non-skin side. A second sheet 6 comprising thermal adhesive fibers is arranged at a non-skin side of the top sheet, and a large number of compression parts 15 made by integrally recessing the second sheet 6 and the top sheet 3 to a skin side are formed on a non-skin side surface of the second sheet 6. The non-thermal adhesive layer 10 and the thermal adhesive layer 11 are connected due to entangling of their fibers. The second sheet 6 is formed at a lower basis weight and a lower density than those of the thermal adhesive layer 11. The compression part 15 is formed including an intermittent pattern or a linear pattern.SELECTED DRAWING: Figure 4

Description

The present invention relates to absorbent articles used for incontinence pads, panty liners, sanitary napkins, etc., and particularly heat-sealing a non-heat-sealing layer made of cellulosic fibers on the skin side and long fibers on the non-skin side. The present invention relates to an absorbent article using a surface sheet containing a heat-sealing layer made of a sex fiber, and a method for producing the same.

Conventionally, as absorbent articles for women such as incontinence pads, panty liners, sanitary napkins, etc., paper cotton such as crushed pulp is placed between the impermeable back sheet such as polyethylene sheet or polyethylene sheet laminated non-woven fabric and the front sheet. It is known that an absorber composed of is interposed.

Since the surface sheet forms a skin contact surface, it is required to be flexible, to have a dry feel even after absorption of excrement, and to be less irritating to the skin. Synthetic fiber non-woven fabrics and resin mesh sheets are widely used in the field of absorbent articles as materials satisfying such demands. However, the surface sheet made of synthetic fibers is not sufficiently satisfactory in that itching and rashes are likely to occur.

As a solution to this problem, a surface sheet made of cotton fiber (cotton fiber) has been proposed. The surface sheet made of cotton fiber has an advantage that it can realize a soft touch like underwear, but in an absorbent article, the surface sheet has high liquid permeability and quickly transfers the liquid to the absorber. On the other hand, when ordinary absorbent cotton fiber is contained in the surface sheet, the surface sheet itself has a high liquid retention property, the surface tends to remain sticky, and the strength is low and the surface sheet is easily torn. There was a problem.

As a means to improve such a problem, in Patent Document 1 below, a cotton nonwoven fabric and a spunbonded nonwoven fabric having thermoplastic resin fibers as constituent fibers are laminated, and the cotton nonwoven fabric and the spunbonded nonwoven fabric are laminated. A topsheet for an absorbent article that is integrated by three-dimensional entanglement of constituent fibers is disclosed.

Further, in Patent Document 2 below, it is a laminated non-woven fabric having a laminated structure of fiber layers containing long fibers, and the laminated structure is a first surface which is one surface of the laminated non-woven fabric and the other surface. It has a second surface, the second surface is composed of a hydrophobic layer containing hydrophobic fibers, and a hydrophilic layer containing hydrophilic fibers is arranged on the first surface side of the hydrophobic layer. The hydrophilic layer is composed of a first hydrophilic layer and a second hydrophilic layer in order from the hydrophobic layer, and the laminated structure has a higher density than the peripheral portion and the laminated structure. A laminated non-woven fabric having an interlayer fusion portion in which the layers constituting the above are fused to each other is disclosed.

Utility Model Registration No. 3218416 Japanese Patent No. 6408194

In the top sheet described in Patent Document 1, since the cotton non-woven fabric and the spunbonded non-woven fabric are integrated by three-dimensional entanglement of the constituent fibers, the structure is such that the body fluid easily transfers from the cotton non-woven fabric to the spunbonded non-woven fabric. However, the body fluid that has permeated the spunbonded non-woven fabric tends to accumulate in the spunbonded non-woven fabric, which may reduce the absorption efficiency.

Further, in the laminated non-woven fabric described in Patent Document 2, since each layer constituting the laminated structure is integrally fused from the skin side surface to the non-skin side surface to form an interlayer fusion portion, this fusion is formed at the time of wearing. There was a risk that the part would come into contact with the skin surface and the feel of the skin would deteriorate. In addition, the body fluid absorbed by the absorber may return to the surface via the fused portion.

Therefore, a main object of the present invention is to provide an absorbent article and a method for producing the same, which improves the absorption efficiency and makes it difficult for reversion to occur without deteriorating the soft touch feeling of cotton.

In order to solve the above problems, as the present invention according to claim 1, in an absorbent article in which an absorber is interposed between a front surface sheet and a back surface sheet.
The surface sheet is composed of a non-heat-sealing layer made of cellulosic fibers arranged on the skin side and a heat-sealing layer made of long-fiber heat-sealing fibers arranged on the non-skin side. The fibers of the non-heat-sealed layer and the heat-sealed layer are entangled and joined to each other.
A second sheet made of heat-sealing fibers is disposed on the non-skin side of the surface sheet, and the second sheet and the surface sheet are pressed on the non-skin side of the second sheet from the non-skin side of the second sheet. A large number of squeezed portions that are integrally recessed toward the skin side are formed, and the heat-sealing layer and the second sheet are fixed to each other in the squeezed portions, and the laminated body of the surface sheet and the second sheet is formed. An absorbent article is provided characterized in that the sides of the skin are formed flat.

In the invention according to claim 1, since the non-heat-sealed layer made of cellulosic fibers is disposed on the skin contact surface of the surface sheet, a soft touch feeling of cellulosic fibers (for example, cotton fibers) can be obtained. Will be. Further, the surface sheet has a laminated structure in which a non-heat-sealing layer on the skin side and a heat-sealing layer made of long fibers on the non-skin side are entwined and joined to each other. With the second sheet made of heat-sealing fibers disposed on the non-skin side of the surface sheet, the second sheet and the surface sheet are integrally recessed toward the skin side on the non-skin side of the second sheet. Since a large number of squeezed portions are formed, the heat-sealing second sheet and the heat-sealing layer (non-skin side layer) of the surface sheet are firmly bonded by the squeezing portion, and the surface sheet is on the lower layer side thereof. It becomes easier for body fluids to transfer to the second sheet placed in.

Further, since the non-heat-sealing layer and the heat-sealing layer are joined by entwining each other's fibers such as water flow entanglement, when they are joined with an adhesive or the like, the body fluid is bonded by the adhesive or the like. It is possible to prevent the transfer from being hindered, and the body fluid is easily transferred from the non-heat-bonded layer to the heat-bonded layer through the fibers entwined with each other, and the bonding strength is not so strong, so that the heat-bonded layer is heated. When squeezed, it has advantages such as less influence of heating and squeezing on the non-thermally fused layer.

Further, since the heat-sealing layer is composed of long-fiber heat-sealing fibers, the body fluid is easily diffused into the heat-sealing layer through the long fibers extending to the non-heat-sealing layer.

Further, the squeezed portion is fixed by heat-sealing the second sheet and the heat-sealing layer constituting the non-skin side layer of the surface sheet by pressing from the non-skin side of the second sheet. Since the skin side surface of the laminated body of the surface sheet and the second sheet is formed flat, the non-woven fabric layer made of cellulosic fibers on the skin side is not squeezed in a state of being heated to a high temperature and is heated. It is possible to prevent the fibers of the non-thermally fused layer from being entangled and break the non-woven fabric due to squeezing, and it is possible to maintain the smoothness of the surface and prevent the deterioration of the touch and the decrease in strength. Further, since the squeezed portion is formed in a state of being recessed toward the skin side on the non-skin side surface of the second sheet and a space is formed between the squeezed portion and the absorber on the lower layer side, the squeezed portion is formed into the absorber via the squeezed portion. It is possible to prevent the absorbed body fluid from returning to the surface.

According to the second aspect of the present invention, the second sheet is provided with the absorbent article according to claim 1, which is formed with a basis weight and a lower density than the heat-sealing layer.

In the invention according to claim 2, by forming the second sheet with a basis weight and a lower density than the heat-sealing layer of the surface sheet, the second sheet and the heat-sealing layer can be joined by the pressed portion. It is strengthening.

According to the third aspect of the present invention, the absorbent article according to any one of claims 1 and 2 is provided in which the pressing portion is formed in an intermittent pattern in which a large number of figures are arranged at intervals. To.

The invention according to claim 3 defines a specific pattern of the pressed portion. Specifically, by forming the squeezed portion in an intermittent pattern in which a large number of figures are arranged at intervals, the entire area of the squeezed portion can be reduced, and the non-heat-sealed layer feels soft to the touch. (Smoothness) and strength can be reliably maintained.

The absorbent article according to claim 4, wherein the squeezed portion is formed to include a linear pattern continuously extending along the longitudinal direction of the absorbent article. Is provided.

The invention according to claim 4 defines another specific pattern of the squeezed portion. Specifically, by forming the squeezed portion including a linear pattern that continuously extends along the longitudinal direction of the absorbent article, the body fluid can easily diffuse along the squeezed portion of the linear pattern. , The body fluid can be absorbed in a wide range of the second sheet.

According to the fifth aspect of the present invention, the squeezed portion is formed in a linear pattern consisting of continuous lines or intermittent lines in the region corresponding to the body fluid draining portion of the wearer, and is spaced apart in other regions. The absorbent article according to any one of claims 1 and 2, which is formed in an intermittent pattern in which a large number of figures are arranged is provided.

The invention according to claim 5 defines another specific pattern of the squeezed portion. Specifically, the squeezed portion is formed in a linear pattern consisting of continuous lines or intermittent lines in the region corresponding to the body fluid draining portion of the wearer, and in other regions, a large number of figures are formed at intervals. It is formed by an intermittent pattern arranged. As a result, the body fluid is likely to diffuse along the linear pattern in the region corresponding to the body fluid discharge portion of the wearer and its vicinity, and in the other regions, the feeling of touch may be reduced by the intermittent pattern. Absent.

According to the sixth aspect of the present invention, the squeezing portion has a pattern in which a large number of figures are arranged at intervals and lines extending in a direction connecting these figures are arranged between adjacent figures. The absorbent article according to any one of claims 1 and 2 formed is provided.

The invention according to claim 6 defines another specific pattern of the squeezed portion. Specifically, as the squeezing portion, a large number of figures are arranged at intervals, and a pattern is formed in which lines extending in a direction connecting these figures are arranged between adjacent figures. .. As a result, the body fluid is diffused in the plane direction by the linear pressing portion, and the body fluid is transferred to the lower layer side by the pressing portion of the figure, so that the absorption efficiency is further improved.

As the present invention according to claim 7, the absorbent article according to any one of claims 1 to 6 is provided, wherein the non-heat-sealing layer is formed of 100% by weight of cotton fibers.

In the invention according to claim 7, by forming the non-heat-sealing layer with 100% by weight of cotton fibers, the flexibility and texture of the surface sheet become particularly excellent.

As the present invention according to claim 8, the absorbent article according to any one of claims 1 to 7 is provided, wherein the heat-sealing layer does not contain non-heat-sealing fibers.

In the invention according to claim 8, the heat-sealed layer does not contain non-heat-sealed fibers such as cellulosic fibers in order to further strengthen the bonding strength between the heat-sealed layer and the second sheet. It has a structure.

The method for producing an absorbent article according to any one of claims 1 to 8, as the present invention according to claim 9.
The laminate of the surface sheet and the second sheet is placed between a flat roll having a flat surface and not heated and a convex roll having a large number of convex portions corresponding to the pressed portions formed on the surface and at least heated at the time of pressing. Provided is a method for producing an absorbent article, which comprises forming the pressed portion at the same time as heat-sealing and joining the heat-sealing fibers of the second sheet and the heat-sealing layer by passing the fibers. ..

The invention according to claim 9 is the first manufacturing method for forming the pressed portion, in which the surface sheet and the second sheet are laminated and passed between the flat roll and the convex roll. As a result, a laminated body of the surface sheet and the second sheet in which the heat-sealed layer of the surface sheet and the second sheet are firmly bonded at the pressed portion can be obtained while the surface is flat and has an excellent feel to the touch.

The method for producing an absorbent article according to any one of claims 1 to 8, as the present invention according to claim 10.
By passing the surface sheet between a flat roll having a flat surface and not being heated and a convex roll having a large number of convex portions formed on the surface and being heated at least during pressing, the surface sheet is formed on the non-skin side surface of the surface sheet. After forming a large number of intermediate pressed portions in which the heat-sealed layer and the non-heat-sealed layer are integrally recessed toward the skin side, a second flat roll having a flat surface and not being heated and the pressing on the surface. The heat-sealing fibers of the second sheet and the heat-sealing layer are heat-sealed by passing through at least a second convex roll that is heated at the time of pressing, in which a large number of convex parts corresponding to the portions are formed. Provided is a method for producing an absorbent article, which comprises forming the pressed portion at the same time as joining.

In the invention according to claim 10, the surface sheet and the second sheet are laminated after increasing the bonding strength between the non-heat-sealed layer and the heat-sealed layer by forming an intermediate pressing portion on the surface sheet in advance. In this state, it is passed between the flat roll and the convex roll.

As described in detail above, according to the present invention, the absorption efficiency is improved and reversion is less likely to occur without deteriorating the soft touch feeling of cotton.

It is a partially broken development view of the sanitary napkin 1 which concerns on this invention. FIG. 2 is a view taken along the line II-II of FIG. FIG. 3 is a view taken along the line III-III of FIG. FIG. 5 is an enlarged cross-sectional view of a surface sheet 3 and a second sheet 6 in the vicinity of the pressed portion 15. It is an enlarged plan view of the surface sheet 3. It is a top view which shows the pattern of the pressing part 15. It is sectional drawing which shows the 1st manufacturing method. It is sectional drawing which shows the 2nd manufacturing method.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Example of basic structure of sanitary napkin>
As shown in FIGS. 1 to 3, the sanitary napkin 1 according to the present invention has a liquid-impermeable back surface sheet 2 made of a polyethylene sheet or the like and a surface that forms a skin contact surface and allows body fluid to quickly permeate. A sheet 3 and an absorber 4 made of cotton-like pulp or synthetic pulp interposed between the sheets 2 and 3, and at least the absorber 4 for maintaining the shape and improving the diffusivity of the absorber 4. An encapsulating sheet 5 made of crepe paper or non-woven fabric covering the skin side surface and the non-skin side surface, a second sheet 6 interposed between the surface sheet 3 and the absorber 4, and a substantially side edge portion of the absorber 4. A pair of left and right three-dimensional gather BSs, side non-woven fabrics 7 forming BS, which are provided so as to stand up from the base end and project toward the skin side in a predetermined section in the front-rear direction so as to include at least the body fluid discharge portion H of the wearer. In the periphery of the absorber 4, the outer edge portion of the back surface sheet 2 and the front surface sheet 3 is formed of an adhesive such as hot melt, a heat seal, an ultrasonic seal, etc. The back surface sheet 2 and the side non-woven fabric 7 that are joined by the joining means of the above and extend laterally from the absorber 4 at both side edges thereof are bonded with an adhesive such as hot melt, heat seal, ultrasonic seal, or the like. It is joined by a joining means. In the illustrated example, the absorber 4 has a one-layer structure, but it may have a multi-layer structure forming a middle-high portion, or may have a multi-layer structure in which absorbers of the same size and shape are stacked.

As the back surface sheet 2, a sheet material having at least water-shielding property such as polyethylene is used, but in recent years, a sheet material having moisture permeability has tended to be used from the viewpoint of preventing stuffiness. The water-impervious / moisture-permeable sheet material has microporous properties obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in the uniaxial or biaxial direction. Sheets are preferably used. One or more adhesive layers (not shown) are formed on the unused surface side (outer surface) of the back sheet 2, and the sanitary napkin 1 is fixed to the underwear when it is attached to the body. As the back surface sheet 2, a polylami non-woven fabric in which a plastic film and a non-woven fabric are laminated may be used.

The absorber 4 can absorb and retain body fluids, and is obtained by dispersing and mixing powdery superabsorbent polymer in fluffy pulp fibers, or an upper layer sheet and non-skin arranged on the skin side. A polymer sheet in which a super absorbent polymer is interposed in a predetermined region between the lower layer sheet arranged on the side can be used.

Examples of the pulp fiber include those made of cellulose fibers such as chemical pulp and dissolved pulp obtained from wood and artificial cellulose fibers such as rayon and acetate, and coniferous pulp having a long fiber length is more functional than broadleaf pulp. And preferably used in terms of price. The basis weight of the pulp fiber is preferably 150 to 500 g / m ² , preferably 250 to 400 g / m ^2, and the basis weight of the superabsorbent polymer is 70 to 470 g / m ² , preferably 140 to 240 g / m ² . It is better to set it to m ² .

Examples of the highly water-absorbent polymer include a polyacrylic acid crosslinked product, a self-crosslinked polyacrylic acid salt, a saponified product of an acrylic acid ester-vinyl acetate copolymer crosslinked product, and an isobutylene / maleic anhydride copolymer crosslinked product. Examples thereof include crosslinked polysulfonates and partially crosslinked water-swellable polymers such as polyethylene oxide and polyacrylamide. Of these, acrylic acid or acrylate-based ones having excellent water absorption and water absorption rate are preferable. In the manufacturing process, the superabsorbent polymer having water absorption performance can adjust the absorption ratio (water absorption capacity) and the absorption rate by adjusting the crosslink density and the crosslink density gradient.

In the illustrated example, the surface sheet 3 is set to be slightly wider than the width of the absorber 4, and only covers the absorber 4, and the outside of the surface sheet 3 in the width direction extends from the surfaces of both sides of the surface sheet 3. It is covered with the existing side non-woven fabric 7 (a member different from the surface sheet 3). The portion of the side nonwoven fabric 7 on the central side in the width direction forms a three-dimensional gather BS. As the side non-woven fabric 7, a non-woven fabric material that has been subjected to an appropriate water-repellent treatment or hydrophilic treatment can be used depending on the purpose of preventing permeation of body fluids or enhancing the feel of the skin. As the side non-woven fabric 7, one made of natural fiber, synthetic fiber, recycled fiber or the like and formed by an appropriate processing method can be used, but preferably, the feeling of stiffness is eliminated and stuffiness is prevented. Therefore, it is preferable to use a non-woven fabric having a low basis weight and having air permeability. Specifically, it is desirable to use a non-woven fabric produced with a basis weight of 15 to 23 g / m ² , and a silicon-based or paraffin-based water repellent is coated to surely prevent the permeation of body fluids. The water-repellent treated non-woven fabric is preferably used.

As shown in FIGS. 2 and 3, the side non-woven fabric 7 extends from the inner position of the absorber 4 to the outer edge of the back surface sheet 2 slightly beyond the side edge of the absorber 4 from the intermediate portion in the width direction. It is adhered with an adhesive such as hot melt.

On the other hand, the inner side portion of the side nonwoven fabric 7 is folded back substantially in double, and one or more of the double sheets are fixed at appropriate positions at both ends or in the longitudinal direction at the intermediate portion in the height direction. In the illustrated example of the book, the two thread-like elastic elastic members 8 and 8 are arranged in a state where both ends or appropriate positions in the longitudinal direction are fixed. At the front and rear ends, the double sheet portion is fixed to the surface sheet 3 side in a folded state as shown in FIG.

<Surface sheet>
The surface sheet 3 forms a skin contact surface that covers the skin side of the absorber 4, and as shown in FIG. 4, is a non-heated cellulosic fiber disposed on the skin side. It is composed of a fusion layer 10 and a heat fusion layer 11 made of heat-sealing fibers of long fibers arranged on the non-skin side, and the non-heat fusion layer 10 and the heat fusion layer 11 are mutually formed. It has a multi-layer structure in which fibers are entwined and joined. The surface sheet 3 preferably has a two-layer structure composed of the non-heat-sealing layer 10 and the heat-sealing layer 11, but an intermediate layer made of cellulosic fibers, synthetic fibers, or the like may be provided in the middle. Good.

The non-heat-sealed layer 10 forming the skin contact surface of the surface sheet 3 is made of a non-woven fabric containing hydrophilic cellulosic fibers. Examples of the hydrophilic cellulosic fiber include naturally derived fibers such as cotton fiber (cotton fiber) and pulp fiber, and artificial cellulosic fiber such as rayon fiber, acetate fiber and lyocell fiber. The cotton fibers include raw cotton fibers, refined / bleached cotton fibers, refined / bleached cotton fibers that have been dyed, refined / bleached cotton wool fibers, and deflated yarns or fabrics. Any cotton fiber such as hair can be used, but in order to increase the absorption speed and diffusivity of the liquid in the lower sheet, absorbent cotton fiber obtained by degreasing the natural oil and fat of cotton wax adhering to the surface of the cotton fiber is used. Is preferable.

It is particularly desirable that the non-heat-sealing layer 10 is made of a spunlace non-woven fabric made of 100% by weight of cotton fibers. By using only cotton fibers, a soft touch can be obtained, and even if it is worn for a long period of time, skin troubles such as itching and rashes can be less likely to occur. Further, the spunlace non-woven fabric has advantages such as no use of an adhesive and flexibility.

As the basis weight of the non-heat sealable layer 10, so that it can exhibit flexibility and texture of the cellulosic fibers, 10 to 30 g / ^{m 2,} and it is preferably a 10 to 15 g / ^{m 2.} The basis weight of the non-woven fabric is obtained by cutting a sample having a size of 50 mm × 50 mm (± 2 mm), measuring the weight, and converting it into the weight per 1 m ² . When a large number of openings are formed in a partial region of the non-woven fabric, the measurement is performed using the non-woven fabric in the region where the pores are not formed. When a large number of holes are formed on the entire surface of the non-woven fabric, a large number of parts having no holes are cut out, and the total weight is measured so that the total area of the many cut parts is 2500 mm ^2. The basis weight can be obtained by dividing by the area.

As the heat-sealing layer 11 forming the non-skin contact surface of the surface sheet 3, a perforated or non-perforated non-woven fabric is used. The non-woven fiber material contains long-fiber heat-sealing fibers. Examples of the heat-sealing fibers include olefin-based fibers such as polyethylene and polypropylene, and thermoplastic synthetic fibers such as polyester-based and polyamide-based, as well as these synthetic fibers, recycled fibers such as rayon and cupra, and cotton. Natural fibers can be included, and composite fibers having a core-sheath structure containing these synthetic fibers can also be used. Since the heat-sealing layer 11 is made of a non-woven fabric containing synthetic fibers, the bondability can be improved by heat-melting the heat-sealing fibers, and the heat-sealing layer 11 is difficult to hold liquid and moves to the lower layer side. In addition to improving the liquid permeability of the material, it is possible to prevent the phenomenon that the body fluid is retained in the heat-sealing layer 11 and returns to the skin side.

As the non-woven fabric constituting the heat-sealing layer 11, a non-woven fabric formed by a direct spinning method such as a spunbond method or a melt blow method for obtaining a long-fiber non-woven fabric is used, and in particular, a web is formed by endless continuous filaments. It is desirable to use a spunbonded non-woven fabric. By forming the heat-sealing layer 11 with the heat-sealing fibers of long fibers, the long fibers constituting the heat-sealing layer 11 can easily enter into the web of the non-heat-sealing layer 10, and the non-heat-fusion layer 11 is easily fused. The body fluid is easily diffused to the heat-sealing layer 11 through the long fibers extending to the layer 10.

In order to facilitate the transfer of body fluid from the non-heat-sealing layer 10 to the heat-sealing layer 11, a hydrophilic agent may be externally applied to the heat-sealing layer 11. The application of the hydrophilic agent to the heat-sealing layer 11 is performed in order to prevent the hydrophilic agent from flowing down during water flow entanglement when the bonding between the non-heat-sealing layer 10 and the heat-sealing layer 11 is due to water flow entanglement. After these bonding by water flow entanglement, it is preferable to apply it to the outer surface of the heat fusion layer 10, but when the connection between the non-heat fusion layer 10 and the heat fusion layer 11 is due to needle sticking, non-heat fusion It may be before or after joining with the layer 10.

The heat-sealing layer 11 may be configured not to contain non-heat-sealing fibers, specifically, the above-mentioned cellulosic fibers, and may contain only heat-sealing fibers, specifically synthetic fibers. It may be configured by. As will be described in detail later, the heat-sealing layer 11 is heat-sealed with the second sheet 6 on the lower layer side in the pressing portion 15, and therefore is composed of only synthetic fibers without containing non-heat-sealing fibers. As a result, heat fusion is easy in the squeezed portion 15, and the bonding strength between the heat fusion layer 11 and the second sheet 6 can be increased.

The basis weight of the heat-sealing layer 11 is preferably larger than the basis weight of the non-heat-sealing layer 10, and specifically, it is preferably 10 to 40 g / m ² , preferably 15 to 20 g / m ^2. .. By making the basis weight of the heat-sealed layer 11 larger than that of the non-heat-sealed layer 10, the influence on the non-heat-sealed layer 10 when the second sheet 6 and the heat-sealed layer 11 are pressed while being heated is reduced. ..

It is desirable that the non-heat fusion layer 10 and the heat fusion layer 11 are joined by a predetermined joining method. If the layers 10 and 11 are not joined and are simply laminated, the strength of the non-heat-sealed layer 10 made of cellulosic fibers is weak and the layers are easily torn, which is not preferable. That is, it is preferable that the non-heat-sealing layer 10 is joined to the heat-sealing layer 11 so that the non-heat-sealing layer 10 is reinforced by the heat-sealing layer 11 and the surface sheet 3 can be prevented from being torn. Further, when the surface sheets have the same texture, the synthetic fiber can be made into a synthetic fiber by forming a laminated structure of the non-heat-sealed layer 10 and the heat-sealed layer 11 as compared with the case where the surface sheet is composed of only the non-heat-sealed layer 10. Since the amount of expensive cellulosic fibers used can be reduced as compared with the above, the cost of the surface sheet 3 can be suppressed, and the laminated structure in which the non-heat-sealed layer 10 and the heat-sealed layer 11 are joined is preferable. preferable.

It is preferable that the non-heat-sealing layer 10 and the heat-sealing layer 11 are joined by entwining the fibers of each other, not by using an adhesive or the like. By entwining these fibers with each other and joining them, the transfer of body fluid such as an adhesive between the non-heat-sealing layer 10 and the heat-sealing layer 11 is inhibited as compared with the case where these fibers are joined by an adhesive or the like. Since no easy-to-use member intervenes, the body fluid easily migrates from the non-thermally fused layer 10 to the heat-sealed layer 11, and the body fluid migrates from the non-thermally fused layer 10 to the heat-sealing layer 11 through the fibers entwined with each other. It will be easier. Further, since the bonding by entanglement of fibers does not increase the bonding strength so much, there is an advantage that when the heat-sealed layer 11 is heated and pressed, the influence of heating and pressing on the non-heat-sealed layer 10 is small. .. Examples of such a joining method by entwining fibers include a water flow entanglement method in which high-pressure water streams are jetted to entangle fibers with each other, and a piercing method in which fibers are mechanically entangled with each other by piercing a needle.

By the way, as shown in FIG. 5, at least the non-heat-sealed layer 10 of the surface sheet 3 has a large number of holes 12 penetrating the front and back in at least the region corresponding to the body fluid discharge portion H in order to enhance the liquid permeability. , 12 ... Is preferably provided. Specifically, the opening 12 can be formed by supporting a fiber material on a mesh-like support in a water flow entanglement step during spunlace production. In this case, it is possible to adjust the individual opening size and opening ratio by changing the conditions of the mesh to be used. Of course, the non-woven fabric after production may be punched (punched) to form holes. The opening 12 may be provided in the entire surface sheet, but it is preferable to provide the opening 12 in at least a region corresponding to the body fluid discharge portion H. It preferably includes a region corresponding to the body fluid discharge portion H, and corresponds to 15% or more of the absorber length in the product length direction, 50% or more of the absorber width in the product width direction, and more preferably the body fluid discharge portion H. It should be provided in a region including a region, which is 50% or more of the absorber length in the product length direction and 70% or more of the absorber width in the product width direction. If the formed region of the opening 12 is less than 15% of the absorber length in the product length direction and less than 50% of the absorber width in the product width direction, the bodily fluid discharge range may not be covered. When it occurs, body fluid remains on the surface sheet 3 and a sticky feeling is felt, and skin troubles such as itching and rashes are likely to occur during wearing. The opening 12 may be provided only in the non-heat fusion layer 10, or may be provided in both the non-heat fusion layer 10 and the heat fusion layer 11.

As shown in FIG. 5, the opening 12 is formed in a vertically long shape that is long in the longitudinal direction of the sanitary napkin 1. For this reason, the liquid is more easily permeated than the circular opening, so that the body fluid easily passes through the surface sheet 3 through the opening 12, and the water retention in the surface sheet 3 is reduced. Further, when the body fluid passes through the opening 12, the liquid passes through while being deformed vertically, so that the diffusion direction of the body fluid can be controlled in the longitudinal direction of the napkin, the diffusion in the lateral direction is suppressed, and the lateral leakage is difficult. In the case of spunlaces, the shape of the holes is difficult to be uniform, but the shape of the holes 12 is generally rectangular to long holes with rounded corners or an ellipse.

As for the dimensions of the opening 12, the length L1 of the sanitary napkin 1 in the longitudinal direction is preferably 0.5 to 4.0 mm, preferably 1.0 to 3.0 mm, and the sanitary napkin 1 has a dimension of 1.0 to 3.0 mm. The length L2 in the width direction is preferably 0.5 to 1.5 mm, preferably 0.5 to 1.0 mm. If the size of the opening 12 is less than 0.5 mm, it is difficult for body fluid to pass through, and it is difficult to form a clear opening due to fluffing of fibers. If the maximum size of the opening 12 exceeds 4.0 mm, the liquid from the opening 12 is difficult to pass. It causes the reversion of the above and the surface exposure of the constituent materials of the absorber 4. The ratio of L1 to L2 (L1 / L2) is preferably 1.2 to 5.0, preferably 2.0 to 3.0. The area A of the opening 12 is preferably 0.3 to 3.0 mm ² , preferably 0.4 to ^2.5 mm ² . Further, the aperture ratio is preferably 15 to 45%, preferably 17 to 30%, and more preferably 18 to 25%. The size of the opening 12 does not have to be uniform over the whole, and can be formed in any size within the above range.

As shown in FIG. 5, at least the non-heat-sealing layer 10 of the surface sheet 3 is formed by the cotton fibers along the longitudinal direction of the sanitary napkin 1 and at intervals in the width direction. And a large number of horizontal streaks 14, 14 ... that extend along the width direction of the sanitary napkin 1 and are formed at intervals in the longitudinal direction to connect the adjacent vertical streaks 13, 13 ... It is preferable to have a structure in which the opening 12 is formed in a portion surrounded by the vertical streaks 13 and the horizontal streaks 14.

The width W1 of the vertical streaks 13 is preferably 0.3 to 2.5 mm, preferably 0.4 to 2.3 mm, and the width W2 of the horizontal streaks 14 is 0.1 to 1.6 mm, preferably 0.1 to 1.6 mm. It is preferably 0.1 to 1.4 mm. The ratio (W1 / W2) of the widths W1 and W2 is preferably 1.2 to 3.0, preferably 1.5 to 2.0. By making the width W1 of the vertical streaks 13 larger than the width W2 of the horizontal streaks 14, liquid diffusion in the longitudinal direction of the sanitary napkin 1 along the vertical streaks 13 is likely to occur.

The vertical streaks 13 have a larger amount of fibers and are formed at a higher density than the horizontal streaks 14. As a result, only the 13 vertical streaks come into contact with the skin, and by reducing the contact area with the skin, it is possible to prevent skin troubles such as itching and rashes even when worn for a long time, and at the same time, to eliminate the skin. The sticky feeling will be reduced even after the liquid. Further, when the body fluid passes through the surface sheet 3, the sanitary napkin 1 tends to diffuse in the longitudinal direction along the vertical streaks 13 having a relatively high density due to the capillary phenomenon of the fibers. Further, since the diffusion direction of the body fluid passing through the opening 12 and the body fluid penetrating the surface sheet 3 coincide with each other in the longitudinal direction of the sanitary napkin 1, the surface sheet is drawn into the body fluid passing through the opening 13. Since the vertical streaks 13 of No. 3 are penetrated, the liquid residue of the surface sheet 3 is suppressed as much as possible.

The fiber content can be measured according to JIS P8207: 2009 "Pulp-Sieving Test Method". Further, in the measurement of the density, the thickness T ₀ (load: 0.5 gf / cm ² ) is automatically measured using an automatic thickness measuring device (Handy compression tester manufactured by Kato Tech, KES-G5), and the basis weight / It can be calculated from T ₀ .

It is preferable that at least the non-thermally fused layer 10 of the surface sheet 3 is externally coated with a water repellent agent at least in the region corresponding to the body fluid discharge portion H. As the water repellent, among known paraffin-based and silicon-based agents, those having less irritation to the skin can be appropriately selected and used, but glyceryl stearate, stearic acid amide, zinc stearate, etc. It is more preferable to appropriately select and use less irritating fats and oils such as calcium stearate, diethanolamide stearate, and magnesium stearate. Of these, glyceryl stearate is particularly preferable. When a water repellent composed of glyceryl stearate is used in the sanitary napkin 1, the coating amount is preferably 0.05 to 1.50 parts by weight with respect to 100 parts by weight of the fiber (in the case of double-sided coating). Total coating amount on both sides). A more preferable coating amount is 0.03 to 1.50 parts by weight. If the amount of the water repellent applied is less than 0.05 parts by weight, the water repellent effect may be insufficient, and if it exceeds 1.50 parts by weight, the water repellency is too high and it becomes difficult for water to permeate.

The application of the water repellent to the non-thermally fused layer 10 prevents the water repellent from flowing down at the time of water flow entanglement when the bonding between the non-heat fused layer 10 and the heat fused layer 11 is due to water flow entanglement. Therefore, it is preferable to apply the heat-sealing layer 10 to the outer surface of the non-heat-sealing layer 10 after these joining by water flow entanglement. However, when the non-heat-sealing layer 10 and the heat-sealing layer 11 are joined by needle sticking. , Before or after joining with the heat-sealing layer 11.

Even if the water repellent is applied only to the skin contact surface among the skin contact surface and the non-skin contact surface (the surface on the absorber 4 side) of the non-heat fusion layer 10, the skin contact surface It may be applied to both surfaces of the absorber 4 side, but at least the water absorption amount obtained from the water absorption amount test described later should be 0.03 g or less, preferably 0.02 g or less. preferable.

The amount of water absorbed by the surface sheet 3 was determined by the following procedure. (1) Prepare a 10 cm square sample and measure the weight (A). (2) Stack three 10 cm square filter papers with the smooth surface side facing up, and set the sample on it. (3) Add 3 ml of tap water at room temperature onto the set sample and leave it for 5 minutes. (4) Weigh the sample after leaving it for 5 minutes (B). (5) The water absorption amount (water retention amount) of the surface sheet 3 is obtained from (B)-(A) = water absorption amount (g).

As the method for applying the water repellent, known methods such as transfer, spraying, brushing, impregnation, and dipping can be appropriately used. When the water absorption on both sides of the sheet is different, the coating method by transfer can be preferably used.

From the viewpoint of production efficiency, the water repellent agent is preferably applied to the entire surface, but it may be applied to at least the region corresponding to the body fluid discharge portion H, and may be applied only to the portion that receives the excrement liquid.

<Second sheet>
The second sheet 6 is arranged between the surface sheet 3 and the absorber 4 and adjacent to the non-skin side of the surface sheet 3. That is, the non-skin side surface of the heat-sealing layer 11 forming the non-skin side layer of the surface sheet 3 and the skin side surface of the second sheet 6 are arranged to face each other. The second sheet 6 preferably has a planar shape having substantially the same shape as the surface sheet 3. As will be described later, the second sheet 6 is joined to the heat-sealing layer 11 of the liquid-permeable surface sheet 3 by heat-sealing in the pressing portion 15.

As the second sheet 6, a perforated or non-perforated non-woven fabric is used as in the heat-sealing layer 11 of the surface sheet 3. Synthetic fibers are contained as the fiber material of the non-woven fabric. For example, in addition to olefin-based synthetic fibers such as polyethylene and polypropylene, and thermoplastic synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra and natural fibers such as cotton can be included in these synthetic fibers. As the non-woven fabric, a non-woven fabric obtained by an appropriate processing method such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, or a needle punch method can be used.

The second sheet 6 preferably does not contain non-heat-sealing fibers, specifically, the above-mentioned cellulosic fibers, and is preferably composed of only heat-sealing fibers, specifically synthetic fibers. As will be described in detail later, this second sheet 6 is heat-sealed with the heat-sealing layer 11 of the surface sheet 3 on the upper layer side in the pressing portion 15, and thus contains non-heat-sealing fibers. In addition, heat fusion is difficult in the squeezed portion 15, and the bonding strength between the second sheet 6 and the heat fusion layer 11 may decrease. The heat-sealing fiber of the second sheet 6 and the heat-sealing fiber of the heat-sealing layer 11 are preferably fiber materials having substantially the same melting point, and both fiber materials are the same. Is particularly preferable.

The second sheet 6 is preferably formed with a basis weight and a lower density than the heat-sealing layer 11. As a result, when the pressing portion 15 described in detail later is applied, the second sheet 6 can be easily bonded to the heat-sealing layer 11, and some of the fibers of the heat-sealing layer 11 are between the fibers of the second sheet 6. It penetrates and the body fluid easily moves from the heat-sealing layer 11 to the second sheet 6. The basis weight of the second sheet 6 is preferably 13 to 35 g / m ² , preferably 13 to 18 g / m ² .

For the second sheet 6, it is preferable to use a material fiber having hydrophilicity with respect to body fluid. Specifically, fibers obtained by surface-treating synthetic fibers with a hydrophilic agent to impart hydrophilicity can be used. The second sheet 6 is preferably more hydrophilic than the heat-sealed layer 11 of the surface sheet 3.

<Pressing section>
As shown in FIG. 4, the second sheet 6 and the surface sheet 3 are integrally recessed toward the skin side on the non-skin side surface of the second sheet 6 by pressing the second sheet 6 from the non-skin side. A large number of squeezed portions 15, 15 ... Are formed. The squeezed portion 15 compresses heat or ultrasonic waves from the non-skin side of the second sheet 6 in a state where the second sheet 6 is laminated on the non-skin side of the surface sheet 3 (the outer surface side of the heat fusion layer 11). By adding, the heat-sealing fibers of the heat-sealing layer 11 and the second sheet 6 are melted and solidified to maintain the pressed state, thereby forming a recessed portion. In the squeezed portion 15, the heat-sealing layer 11 and the second sheet 6 are firmly fixed, and the surface sheet 3 and the second sheet 6 are integrated. In the laminated body of the surface sheet 3 and the second sheet 6, the skin side surface is formed flat, and a large number of recessed portions corresponding to the squeezed portion 15 ... Are formed on the non-skin side surface.

In this way, since the surface sheet 3 and the second sheet 6 are firmly fixed by the pressing portion 15, the surface sheet 3 and the second sheet 6 are in close contact with each other without a gap, and a liquid pool or the like is generated between these layers. Instead, the body fluid is easily transferred from the surface sheet 3 to the second sheet 6.

Further, since the squeezed portion 15 is formed by squeezing the second sheet 6 from the non-skin side, the non-heat fusion layer 10 on the skin side is not unevenly processed in a high temperature state, and is in a high temperature state. It is possible to prevent fiber entanglement due to squeezing and breakage of the non-woven fabric due to this, and to maintain the smoothness of the surface, and to prevent deterioration of the touch and decrease in strength.

In the embodiment shown in FIGS. 1 and 6 (A), the squeezed portion 15 is formed in an intermittent pattern in which a large number of figures are arranged at intervals. In FIGS. 1 and 6 (A), the pressing portions 15 composed of circular dots are arranged in a houndstooth pattern at predetermined intervals. The squeezed portion 15 may be arranged in a regular lattice pattern arranged at predetermined intervals along the width direction and the longitudinal direction of the sanitary napkin 1.

Further, in the embodiment shown in FIGS. 1 and 6 (A), the squeezed portion 15 composed of circular dots is applied to almost the entire surface sheet 3, but a region corresponding to the body fluid discharge portion H is required. It may be applied only to the area of, and may not be applied to other areas. As a result, the body fluid is smoothly transferred from the surface sheet 3 to the second sheet 6 in the region corresponding to the body fluid discharge portion H, and in the other regions, the sheet can be prevented from becoming hard due to squeezing, and is cellulosic. You will be able to feel the soft texture of the fibers even more.

The size of the pressed portion 15 is preferably 0.5 to 10 mm, preferably 0.5 to 2 mm. When it is smaller than 0.5 mm, the bonding strength per one place of the pressed portion 15 between the heat-sealing layer 11 and the second sheet 6 is small, and the adhesion between the heat-sealing layer 11 and the second sheet 6 is lowered, so that the body fluid It becomes difficult for the transition to proceed smoothly. On the other hand, if it is larger than 10 mm, the hardness of the pressed portion 15 is easily felt, and the wearing feeling may be deteriorated.

The planar shape of the squeezed portion 15 is circular in the example shown in FIGS. 1 and 6 (A), but may be a cruciform figure as shown in FIG. 6 (B), and is formed in a cruciform shape. In the case, the linear portion extending in all directions facilitates the diffusion of the body fluid in all directions, suppresses the concentration of the body fluid in a specific region, and improves the absorption efficiency. In addition to this, although not shown, it is also possible to form an arbitrary figure such as an ellipse, a polygon, a star, or a heart.

When the squeezed portions 15 ... are formed in an intermittent pattern, the distance B between the adjacent squeezed portions 15 and 15 is preferably 3 to 15 mm, preferably 5 to 10 mm, as shown in FIG. If this distance B is smaller than 3 mm, the squeezed portions 15 and 15 are too close to each other, which causes the surface sheet 3 to become hard. On the other hand, if it is larger than 15 mm, the adhesion between the heat-sealing layer 11 and the second sheet 6 is lowered, and it becomes difficult for the body fluid to be smoothly transferred. This interval B is substantially constant over the entire surface in the example shown in FIG. 1, but may be changed depending on the region. For example, in the region corresponding to the body fluid discharge portion H, the interval B is relatively small in order to improve the adhesion between the heat fusion layer 11 and the second sheet 6 and facilitate the transfer of the body fluid, and in other regions. , Can be made relatively large to maintain a flexible feel. Further, the interval B may be gradually increased toward the outer edge side of the sanitary napkin 1 centering on the region corresponding to the body fluid discharge portion H.

A modified example of the pattern of the squeezed portion 15 ... will be described with reference to FIG. 6, and as shown in FIG. 6 (C), the squeezed portion 15 ... Is continuous along the longitudinal direction of the sanitary napkin 1. It may be formed to include a linear pattern extending from the surface. In the illustrated example, the linear pattern is composed of wavy lines that repeat unevenness in the width direction, a plurality of wavy lines are arranged at predetermined intervals in the width direction, and the central portion of the convex portion and the concave portion in the width direction of the wavy line. A circular squeezing portion that is independent from the wavy line is arranged in each of the squeezing portions. By providing the linear pressing portion that extends continuously along the longitudinal direction of the napkin in this way, the body fluid is easily diffused along the pressing portion of this linear pattern, and the body fluid is spread over a wide range of the second sheet 6. You will be able to absorb it. Further, by forming the pressed portion of the linear pattern with a wavy line that repeats unevenness in the width direction, the distance becomes longer than when it is formed by a straight line along the longitudinal direction, and the body fluid can be diffused over a wider range of the second sheet 6. Will be. Further, since independent circular pressing portions are formed in the convex portion and the central portion of the concave portion of the wavy line, the body fluid can be easily transferred to the second sheet 6 through the circular pressing portion, so that the body fluid is easily transferred to the convex portion and the concave portion. Is less likely to stay.

As another modification of the squeezed portion 15 ..., as shown in FIG. 6D, a linear pattern consisting of continuous lines or intermittent lines in the region corresponding to the body fluid discharge portion H of the wearer and its vicinity thereof. In the other areas, it is formed by an intermittent pattern in which a large number of figures are arranged at intervals. In the illustrated example, the linear pattern is formed in an oblique grid pattern in which a plurality of straight lines extending in two directions that are substantially orthogonal to each other intersect, but the present invention is not limited to this, and any linear pattern is not limited to this. It may be formed of a straight line, a curved line, a wavy line, or the like. By arranging the squeezing portion 15 of the linear pattern in the region corresponding to the body fluid discharging portion H of the wearer, the body fluid is rapidly diffused in the plane direction along the linear pattern in this region, and the body fluid is spread over a wider range. You will be able to absorb it. Further, in the other regions, by arranging the squeezed portions 15 in an intermittent pattern, the goodness of touch is not deteriorated.

Further, as another modification of the squeezing portion 15 ..., as shown in FIG. 6 (E), a large number of circular squeezing portions are arranged at intervals, and between adjacent circular squeezing portions. , These squeezed parts are formed in a pattern in which linear squeezed parts extending in a direction connecting the squeezed parts are arranged. As a result, the body fluid is diffused in the plane direction by the pressing portion of the linear pattern, and the body fluid is transferred to the lower layer by the pressing portion of the figure, so that the absorption efficiency is further improved. In order to ensure that the body fluid is transferred to the lower layer side in the squeezed portion of the figure, the squeezed portion of the linear pattern is preferably separated from the squeezed portion of the figure, and the separation distance is about 1 to 10 mm. Is preferable.

The embossing rate, which is the ratio of the total area of a large number of squeezed portions 15, 15 ... To the area of the second sheet 6, increases the bonding strength between the second sheet 6 and the heat-sealing layer 11 and facilitates the transfer of body fluid. Therefore, from the viewpoint of preventing the wearing feeling from being deteriorated by the hardness of the pressed portion 15, it is preferably 1 to 20%, preferably 6 to 15%.

As shown in FIG. 4, the squeezing depth of the squeezed portion 15 is set to the intermediate position of the non-heat-sealed layer 10, so that most of the non-heat-fused layer 10, preferably more than half of the thickness, is not squeezed. It is preferable to set it to. As a result, the skin side surface of the non-heat-sealed layer 10 can sufficiently maintain a soft texture even in the portion where the pressed portion 15 is applied. In the squeezed portion 15, a predetermined recessed shape is maintained by melting and solidifying the heat-sealing fibers of the heat-sealing layer 11 and the second sheet 6 at the bottom during squeezing. Further, a part of the melted heat-sealing fibers flows between the fibers of the non-heat-sealing layer 10 at the bottom of the pressed portion 15 and solidifies, thereby forming the heat-sealing layer 11 and the non-heat-sealing layer 10. It is possible to increase the joint strength of.

By applying the squeezed portion 15, a part of the non-heat-sealed layer 10 on the non-skin side is compressed, and the fiber density is increased. Therefore, the body fluid absorbed by the non-heat-sealing layer 10 is easily drawn into the squeezed portion 15 due to the capillary action due to the difference in fiber density, and the body fluid drawn into the squeezed portion 15 is subjected to the squeezing process. Due to the entanglement of the fibers between the layers and the difference in the density of the fibers, it is easy to move to the second sheet 6. Therefore, by applying the squeezed portion 15, there is an advantage that the liquid residue on the surface of the non-heat-sealed layer 10 is small, the sticky feeling can be reduced, and the rash due to stuffiness can be prevented.

<Manufacturing method>
Next, a method for producing the sanitary napkin 1 will be described. Here, a method for forming the pressed portion 15, which is a feature of the present invention, will be described in detail. Other steps are the same as those for manufacturing a general sanitary napkin.

As a first embodiment, as shown in FIG. 7, the laminate of the surface sheet 3 and the second sheet 6 corresponds to the flat roll 20 having a flat surface and not being heated, and the pressing portion 15 on the surface. The heat-sealing fibers of the second sheet 6 and the heat-sealing layer 11 are heat-sealed by passing between the convex rolls 21 on which a large number of convex portions 22, 22 ... Are formed and which are heated at least during pressing. At the same time as joining the squeezed portion 15, a method of forming the squeezed portion 15 ... Can be mentioned.

As a result, the skin side surface of the surface sheet 3 is flat and has an excellent feel to the touch, and the surface sheet 3 and the second sheet 6 in which the heat-sealing layer 11 of the surface sheet 3 and the second sheet 6 are firmly bonded in the squeezed portion 15 A laminated body with and can be obtained. Further, since the flat roll 20 is used as the roll facing the non-thermally fused layer 10 of the surface sheet 3, the flat roll 20 is not affected by the partial compressive force from the non-thermally fused layer 10 side. Since only the convex roll 21 is heated and squeezed without heating, it is possible to prevent the fibers of the non-thermally fused layer 10 from being unentangled and the non-woven fabric from being broken by heating or squeezing during squeezing. At the same time, the smoothness of the surface of the non-thermally fused layer 10 can be maintained, and deterioration of the touch and deterioration of the strength can be prevented.

Next, as a second embodiment, as shown in FIG. 8, a surface sheet 3 having a two-layer structure of a non-heat-sealed layer 10 and a heat-sealed layer 11 is placed on a flat roll 23 having a flat surface and not heated. The heat-sealing layer 11 and the non-heat are formed on the non-skin side surface of the surface sheet 3 by passing between the surface and the convex roll 24 on which a large number of convex portions 25, 25 ... Are formed at least during pressing. After forming a large number of intermediate pressing portions 15', 15'... in which the fusion layer 10 is integrally recessed toward the skin side, a second flat roll 26 having a flat surface and not being heated, and the pressing on the surface. By passing a large number of convex portions 28, 28 ... Corresponding to the portions 15 ... with the second convex roll 27 which is heated at least during pressing, the second sheet 6 and the heat-sealing layer 11 are heat-fused. A method of forming the pressed portion 15 at the same time as heat-sealing and joining the adhesive fibers can be mentioned.

In the second embodiment, the bonding strength between the non-heat-sealing layer 10 and the heat-sealing layer 11 is increased by forming the intermediate pressing portion 15'... on the surface sheet 3 in advance. After that, the pressed portion 15 is formed in a state where the surface sheet 3 and the second sheet 6 are laminated. The pressing portion 15 ... may be applied to the recessed portion of the intermediate pressing portion 15'..., or may be applied to a portion other than the intermediate pressing portion 15'...

1 ... Sanitary napkin, 2 ... Back sheet, 3 ... Front sheet, 4 ... Absorber, 5 ... Encapsulation sheet, 6 ... Second sheet, 7 ... Side non-woven fabric, 8 ... Filamentous elastic elastic member, 10 ... Non-thermal fusion Layers, 11 ... heat-sealed layers, 12 ... openings, 13 ... vertical streaks, 14 ... horizontal streaks, 15 ... squeezed parts, 15'... intermediate squeezed parts, 20 ... flat rolls, 21 ... convex rolls, 22 ... convex parts, 23 ... Flat roll, 24 ... Convex roll, 25 ... Convex part, 26 ... Second flat roll, 27 ... Second convex roll, 28 ... Convex part

Claims (10)

In an absorbent article in which an absorber is interposed between the front surface sheet and the back surface sheet,
The surface sheet is composed of a non-heat-sealing layer made of cellulosic fibers arranged on the skin side and a heat-sealing layer made of long-fiber heat-sealing fibers arranged on the non-skin side. The fibers of the non-heat-sealed layer and the heat-sealed layer are entangled and joined to each other.
A second sheet made of heat-sealing fibers is disposed on the non-skin side of the surface sheet, and the second sheet and the surface sheet are pressed on the non-skin side of the second sheet from the non-skin side of the second sheet. A large number of squeezed portions that are integrally recessed toward the skin side are formed, and the heat-sealing layer and the second sheet are fixed to each other in the squeezed portions, and the laminated body of the surface sheet and the second sheet is formed. An absorbent article characterized in that the sides of the skin are formed flat. The absorbent article according to claim 1, wherein the second sheet is formed with a basis weight and a lower density than the heat-sealed layer. The absorbent article according to any one of claims 1 and 2, wherein the squeezed portion is formed in an intermittent pattern in which a large number of figures are arranged at intervals. The absorbent article according to any one of claims 1 and 2, wherein the pressed portion is formed including a linear pattern extending continuously along the longitudinal direction of the absorbent article. The squeezed portion is formed in a linear pattern consisting of continuous lines or intermittent lines in the region corresponding to the body fluid draining portion of the wearer, and in other regions, a large number of figures are arranged intermittently at intervals. The absorbent article according to any one of claims 1 and 2, which is formed in a pattern. Claims 1 and 2 are formed in a pattern in which a large number of figures are arranged at intervals and lines extending in a direction connecting these figures are arranged between adjacent figures. Absorbent article according to any. The absorbent article according to any one of claims 1 to 6, wherein the non-heat-sealed layer is formed of 100% by weight of cotton fibers. The absorbent article according to any one of claims 1 to 7, wherein the heat-sealing layer does not contain non-heat-sealing fibers. The method for producing an absorbent article according to any one of claims 1 to 8 above.
The laminate of the surface sheet and the second sheet is placed between a flat roll having a flat surface and not heated and a convex roll having a large number of convex portions corresponding to the pressed portions formed on the surface and at least heated at the time of pressing. A method for producing an absorbent article, which comprises forming the pressed portion at the same time as heat-sealing and joining the heat-sealing fibers of the second sheet and the heat-sealing layer by passing the fibers. The method for producing an absorbent article according to any one of claims 1 to 8 above.
By passing the surface sheet between a flat roll having a flat surface and not being heated and a convex roll having a large number of convex portions formed on the surface and being heated at least during pressing, the surface sheet is formed on the non-skin side surface of the surface sheet. After forming a large number of intermediate pressed portions in which the heat-sealed layer and the non-heat-sealed layer are integrally recessed toward the skin side, a second flat roll having a flat surface and not being heated and the pressing on the surface. The heat-sealing fibers of the second sheet and the heat-sealing layer are heat-sealed by passing through at least a second convex roll that is heated at the time of pressing, in which a large number of convex parts corresponding to the portions are formed. A method for producing an absorbent article, which comprises forming the pressed portion at the same time as joining with each other.

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