JP2002105835A - Absorptive article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a conventional perforated film used as a surface sheet for a sanitary napkin, etc., has a sticky feeling to the skin, the surface sheet made of a conventional nonwoven fabric having a ridge channel has irritation to the skin and poor liquid permeability. SOLUTION: In this absorptive article, rhombic protruded parts 16 are formed on a surface layer 10 obtained by piling a surface sheet 11 on a lining sheet 12, channel parts 17 are formed so as to enclose the rhombic protruded parts 16 and hole parts 13 are opened to the channel parts 17. Consequently, a liquid supplied from the protruded parts 16 to the channel parts 17 is rapidly absorbed from the hole parts 13. The protruded parts have soft touch to the skin since the parts individually and independently exhibit cushioning properties and elasticity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to absorbent articles such as sanitary napkins, disposable diapers, urine absorbing pads, panty liners and the like. The present invention relates to an absorbent article that can provide

[0002]

2. Description of the Related Art Some absorbent articles such as sanitary napkins and disposable diapers use a perforated film as a liquid receiving side surface material.

[0003] In this type of apertured film, a resin film such as an olefin resin is supplied to a screen drum having a large number of holes on its surface, the resin is softened by hot air, and the resin film is drawn by suction pressure inside the screen drum. A hole corresponding to the drum hole is formed at the same time, and at the same time, the periphery of the opening is protruded toward one side of the film to form a liquid guide tube.

When an apertured film is used as the liquid receiving side surface material, the liquid applied to the film surface passes through the apertures and is absorbed by the liquid absorbing layer. By whitening the aperture film, there is an effect that the color of liquid such as menstrual blood absorbed by the liquid absorbing layer can be shielded.

[0005] Further, as the liquid receiving side surface material, a relatively bulky air-through non-woven fabric or the like is used, in which ridges and grooves extending linearly are formed alternately, and the ridges and grooves are absorbed. What is arranged in the longitudinal direction of the sexual article is used. This has the advantage that the wearer's skin is rich in cushioning properties and the contact with the skin is soft.

[0006]

However, in the case of using a perforated film, when a large amount of liquid is applied to the surface, all the liquid cannot be quickly guided from the perforations to the liquid absorbing layer. The liquid may remain on the film surface.
When the liquid remains on the film surface, the liquid flows along the film surface in the longitudinal direction and the lateral direction of the absorbent article, and it is easy to give a wet feeling to the wearer's skin. Leakage may also occur.

Further, as the aperture film, there is a film in which a liquid guide tube facing the liquid absorbing layer is formed at an edge of the aperture.
Since such a liquid guide tube is dispersed as a portion having relatively high rigidity, the apertured film tends to give a rigid feeling (stiff contact feeling) to the wearer's skin.

When the surface material is formed of a nonwoven fabric having ridges and grooves, the liquid easily flows in the grooves in the longitudinal direction of the absorbent article, and the wearer's skin can be spread over a wide range. Easy to give wet feeling. Furthermore, since the ridges are formed linearly, when the ridges fall down due to the pressure of the wearer's skin, adjacent ridges overlap, and it is easy to give a rigid feeling when hitting the skin.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide an absorbent article having a surface material capable of rapidly permeating a liquid and having a soft contact with the wearer's skin. And

[0010]

The present invention relates to an absorbent article having a back sheet, a liquid-permeable surface layer, and a liquid absorbing layer interposed between the back sheet and the surface layer. The surface layer is formed of a non-woven fabric, and the surface layer is continuously formed so as to divide the ridges while surrounding the ridges with a ridge having a predetermined area protruding to the surface side. And a cross section formed in an uneven shape, and a hole for liquid permeation is formed in the groove.

In this case, it is preferable that a space is formed on the back side of the raised portion, and that the fiber density of the groove is higher than the fiber density of the raised portion.

[0012] In this absorbent article, the raised portion having a predetermined area of the surface layer formed of the nonwoven fabric hits the skin with a cushioning property, so that the contact with the skin is soft. In addition, the liquid supplied to the raised portion quickly flows into the groove around the hole, and the liquid that has reached the groove flows in the longitudinal and horizontal directions of the absorbent article along the groove, and the hole positioned in the groove. From the liquid absorption layer. Therefore, liquid permeation is quick.

Further, the present invention provides an absorbent article having a back sheet, a liquid-permeable surface layer, and a liquid absorbing layer interposed between the back sheet and the surface layer, wherein the surface layer is formed of a liquid. The surface layer is formed of a permeable non-woven fabric, and the surface layer is formed continuously so as to separate each of the depressions while enclosing each of the depressions with a predetermined area depressed toward the liquid absorbing layer. And a cross section formed in an uneven shape, and a hole for liquid permeation is formed in the ridge.

Also in this case, it is preferable that the fiber density of the ridge is higher than the fiber density of the depression.

In the above invention, since viscous matter and cells of the excrement are retained in the depression having a predetermined area, they do not move on the surface material. In addition, when the ridge fiber density is increased, the liquid is rapidly absorbed by the ridge, and is quickly supplied to the liquid absorbing layer from the holes formed in the ridge. In addition, since the ridges are formed so as to surround the depressions, the ridges can be easily deformed in both the vertical and horizontal directions as compared with the conventional linear ridges, and the cushion feeling given to the skin is also improved.

For example, in the groove or the ridge,
The holes are arranged so as to surround the raised portion or the depressed portion, the shape of the arrangement line of the holes is a rhombus, and the acute angle of the rhombus is directed in the longitudinal direction of the absorbent article, The acute interior angle is between 20 and 70 degrees.

In this case, it is preferable that the length of one side of the rhombus formed by the arrangement lines is 3 to 20 mm.

In the groove or the ridge, the holes are arranged so as to surround the raised portion or the depressed portion, and include the raised portion or the depressed portion surrounded by the hole. It is preferable that the area of the region is 9 to 400 mm ² .

Further, the bulk of the surface layer is 0.5 to 5 mm.
It is preferable that the compression ratio when applying a pressure of 4.9 kPa to the surface layer is 30 with a KES texture tester.
It is preferably about 80%.

At least a portion of the surface layer where the cross section is formed unevenly is formed by laminating at least two nonwoven fabrics. If each of the nonwoven fabrics has the uneven shape, the surface material further has a cushioning property. To have In this case, it is preferable that the hydrophilicity of the nonwoven fabric of the back layer is higher than the hydrophilicity of the nonwoven fabric of the surface layer.

[0021]

FIG. 1 is a cross-sectional view of an sanitary napkin as an example of an absorbent article according to the present invention, taken along a center cutting line that bisects a longitudinal direction. FIG. FIG. 3 is a cross-sectional view taken along line II-II, FIG. 4 is a plan view showing a surface layer concavo-convex pattern, and FIG. 5 is a plan view showing a surface layer concavo-convex pattern of another embodiment. FIG. 6 is a sectional view showing an absorbent article according to another embodiment of the present invention.

In the sanitary napkin 1 shown in FIG. 1, an absorbent core 3 is provided in a central region of an upper surface of a liquid-impermeable back sheet 2, and the surface of the absorbent core 3 is covered with a surface layer 10. Have been done. Side sheets 5 and 5 are provided on both left and right sides of the liquid receiving side surface of the sanitary napkin 1. The side sheets 5, 5 are joined to the back sheet 2 on both left and right sides, and are further bent on the left and right outer sides of the absorbent core 3 to form leak-proof walls 6, 6. The side sheets 5, 5 folded to form the leak-proof walls 6, 6 are joined to the upper surface of the left and right sides of the surface layer 10.

An elastic member 7 extending in the vertical direction (Y direction) is joined to each of the leakage preventing walls 6, 6. Due to the contraction force of the elastic member 7, the sanitary napkin 1 has a curved shape in the vertical direction, and as a result, the leak-proof wall 6 can rise from the liquid receiving side surface of the sanitary napkin 1.

The surface layer 10 is formed of a non-woven fabric. As shown in FIGS. 2 and 3, the surface layer 10 is formed by stacking a topsheet 11 and a backing sheet 12, and the topsheet 11 and the backing sheet 12 are at least partially joined. .

The surface layer 10 has a large number of liquid guide holes 13 penetrating through the top sheet 11 and the backing sheet 12. 2 and 4, the holes 13 are linearly arranged. In FIG. 4, the arrangement lines of the holes 13 are indicated by L1 and L2. Here, the arrangement lines L1 and L2 mean virtual lines passing through the center lines of the holes 13 arranged in a straight line. Further, when the holes 13 are not arranged in a line, and are arranged in a plurality of lines or randomly within a band-like range of a predetermined width, the width direction of the band-like range in which the holes 13 are arranged is It means an imaginary line passing through the center.

In the embodiment shown in FIGS. 2 and 4, the arrangement lines L1 and L2 extend at an angle with respect to the vertical direction (Y direction), and the arrangement lines L1 and L2 The enclosed partition area 15 is a rhombus. However, this is not limited to a rhombus, and may be a parallelogram, a rectangle, a square, a pentagon, a hexagon, or the like.

As shown in FIG. 4, the diamond-shaped partitioned area 1
An acute angle of 5 is directed in the vertical direction (Y direction). Further, a raised portion 16 in which the top sheet 11 and the back sheet 12 are both raised in the surface direction away from the absorbent core 3 is formed in the partitioned area 15. The ridge 1
6 as a planar pattern,
The shape is similar to the rhombus, specifically, a shape in which the corners of the rhombus are rounded.

The periphery of the raised portion 16 is formed by a groove 17.
The raised portions 16 are separated from each other by the grooves 17 so as to be independent from each other. In the embodiment shown in FIGS. 2 and 4, the groove 17 is formed linearly with a predetermined width dimension Wa, and the hole 13 and the arrangement lines L1 and L2 are It is located at the center in the width direction and at the bottom of the groove 17.

As shown in FIG. 3, the raised portion 16 of the surface layer 10 has a substantially flat upper surface (surface) 16a, and a gentle curved surface is formed from the bottom of the groove 17 to the upper surface 16a. I have. And, as shown in FIG.
A space 18 is formed on the back side of the raised portion 16.

The cross section of the surface layer 10 in which the raised portions 16 and the grooves 17 are formed has an uneven shape. As shown in FIG. 1, the uneven shape has a region (width) covering the absorbent core 3. W and an area within the vertical length L). However, the uneven shape may be formed only in a region covering the absorbent core 3 and in a central portion narrower than a region surrounded by the width W and the vertical length L. It may be formed in a wide area extending outside the contour of the core 3. Further, the uneven portion may be formed in the entire surface layer 10.

As shown in FIGS. 2 and 3, the backing sheet 12 is provided mainly only in the area where the irregularities are formed, and in other areas, the backing sheet 12 includes only the topsheet 11 and the surface layer. Are formed.

In a preferred embodiment, the uneven shape is heated and pressurized in a state where the top sheet 11 and the backing sheet 12 are overlapped, and as a result, the fiber density at the bottom of the groove 17 is raised. The fiber density is higher than the fiber density on the upper surface 16a of the portion 16.

Sanitary napkin 1 using this surface layer 10
In the above, the liquid applied to the surface layer 10 can pass through the topsheet 11 and the backing sheet 12, but
The liquid is guided from the upper surface 16 a of the raised portion 16 to the groove 17 surrounding the raised portion 16 in the partitioned region 15. In particular, when the fiber density in the groove 17 is higher than the fiber density in the protrusion 16, the liquid given to the protrusion 16 by the capillary action in the groove 16 is quickly drawn into the groove 17. In particular, since the individual raised portions 16 are all surrounded by the grooves 17, the liquid supplied to the raised portions 16 is guided to the surrounding grooves 17 very quickly.

The liquid introduced into the groove 17 is supplied to the groove 1
7, but since the groove 17 is formed obliquely in the vertical direction and the horizontal direction, the liquid flows in the groove 17.
And spread vertically and horizontally. The hole 1 is provided in the groove 17.
Since the opening 3 is open, the liquid that is going to be transmitted through the groove 17 immediately passes through the hole 13 and is sucked into the absorbent core 3. By transmitting the liquid through the groove 17, the liquid is less likely to be saturated in the groove 17, and furthermore, the stagnation of the liquid in and around the hole 13 can be suppressed, and the liquid can be promptly transferred from the hole 13 toward the absorbent core 3. Can be given.

Moreover, the grooves 17 are individually provided with the respective raised portions 16.
Is formed so that the liquid is not guided in multiple directions in the groove portion 17, and the phenomenon that the liquid spreads over a wide range in the vertical and horizontal directions does not easily occur.

Further, the raised portions 16 have a predetermined area and are independent of each other, and further, since the space 18 is formed on the back side thereof, each raised portion 16 is flexibly deformed by the pressure of the skin. it can. Therefore, it is rich in cushioning properties and it is difficult to give a feeling of pressure to the wearer's skin. Also, since the individual raised portions 16 are separated from each other by the groove portions 17, the raised portions 16 are separated from each other.
Is not transmitted to other raised portions 16. Therefore, the surface layer 10 can follow and deform according to the uneven shape of the wearer's skin, and flexibly follows not only the pressure in the thickness direction of the surface layer 10 but also the vertical and horizontal pressures. Therefore, the wearing feeling is excellent. Further, since each of the protruding portions 16 is formed alternately in the X direction and the Y direction, when the protruding portions 16 are crushed or depressed by the pressure of the wearer's skin, the adjacent protruding portions are mutually separated. It is hard to overlap, and it is hard to cause pressure irritation to the skin.

The top sheet 11 and the backing sheet 12
Is an air-foam non-woven fabric made by bonding the fiber web formed by the card method with hot embossing or hot air to form a sheet,
Spunbonded nonwoven fabric formed by laminating continuous filaments and joining fibers together to form a sheet, spunlaced nonwoven fabric obtained by entanglement of fibers of a fiber web formed by a card method with a water flow, and the like can be used. Among these nonwoven fabrics, an air-through nonwoven fabric in which a fibrous web is formed by a card method and the fibers are joined together by hot air suction, as a material having a high bulk, a low density of fibers, and a high elastic recovery force in a thickness direction, is preferable.

The fibers used in the nonwoven fabric material include P
E (polyethylene) / PP (polypropylene), PE /
A core-sheath structure in which the sheath component is made of a resin having a lower melting point than the core component such as PET, EVOH (ethylene vinyl alcohol copolymer) / PET, PP / PP, PET (polyethylene terephthalate) / PET, and eccentricity. A heat-fusible fiber is used as a composite rigid fiber having a core-sheath structure or a composite synthetic fiber having a side-by-side structure obtained by combining the above resins.

In order to obtain a whitening effect, if necessary, an inorganic filler such as titanium oxide may be added to the fibers in an amount of 0.1 to 0.1%.
It is preferable to contain it in an amount of 10% by mass. By including the inorganic filler, the topsheet 11 and the backing sheet 12 can be made white, and the color of a liquid such as menstrual blood absorbed by the absorbent core 3 can be visually hidden.

The nonwoven fabric of the topsheet 11 and the backing sheet 12 is formed of the above-mentioned hydrophobic synthetic fiber.
Or, the hydrophobic synthetic fiber, viscose rayon,
Regenerated cellulose fibers such as acetate rayon and hydrophilic fibers such as natural cellulose fibers may be mixed.

Alternatively, the topsheet 11 located on the skin side of the wearer is mainly composed of hydrophobic fibers to form a hydrophobic nonwoven sheet, and the backing sheet 12 is composed of the hydrophobic fibers and the hydrophilic fibers. May be formed of a nonwoven fabric sheet obtained by mixing Alternatively, hydrophilic treatment may be performed by applying a hydrophilic oil agent or the like to the hydrophobic synthetic fibers constituting the backing sheet 12. As described above, the hydrophilicity of the backing sheet 12 is made higher than that of the topsheet 11 to provide a gradient of the hydrophilicity. The surface layer 11 is attracted to the sheet 12 so that it can pass through the surface sheet 11, and the wettability on the surface of the surface layer 10 can be reduced.

The top sheet 11 and the backing sheet 12
In the case where hydrophilic fibers are mixed with hydrophobic synthetic fibers, the hydrophilic fibers are blended at a ratio of 2 to 30% by mass so as to have moisture absorption performance and not to impair the elasticity of the nonwoven fabric sheet. Is preferred.

It is important that the nonwoven fabric material of the topsheet 11 has cushioning properties and elasticity.
Therefore, the bulk of the topsheet 11 is preferably in the range of 0.3 to 2.0 mm, more preferably in the range of 0.3 to 1.0 mm, and has a fineness of 1.1 to 1.0 so as to prevent formation unevenness.
It is preferable to use the basis weight within the range of 4.4 dtex and the range of 20 to 150 g / m ² . In addition, in order to obtain cushioning and elasticity, the raised portion 16 is made of a nonwoven fabric in a state before forming the hole portion 13 with a width of 1 inch and a distance between chucks of 10 inches.
The breaking strength in the longitudinal direction (Y direction) when pulled at 0 mm and at a pulling speed of 100 mm / min is preferably 6.8 N or more, more preferably in the range of 11.7 to 24.5 N.
Further, the breaking strength in the lateral direction (X direction) is preferably 0.9 N or more, more preferably in the range of 1.4 to 2.5 N.

Further, as shown in FIGS. 2 and 3, in the area covering the absorbent core 3, the surface layer 10 has a double structure in which the backing sheet 12 is joined to the top sheet 11. In addition, the cushioning property and the elastic recovery rate can be further increased.

The maximum diameter of each hole 13 is measured and averaged. The average maximum diameter is in the range of 0.3 to 2.0 mm so that the liquid can permeate and the liquid returns to the surface side. It is preferable in terms of prevention. Further, in consideration of the texture and durability of the nonwoven fabric, the area occupied by the holes is preferably 5 to 40%,
More preferably, it is 7 to 15%.

The holes 13 can be formed by defibrating the fibers of the nonwoven sheet by needling with heat. The holes 13 may be the same in all dimensions, or may be arranged by combining holes of different sizes. When the holes 13 are formed by the needling, the fibers around the holes 13 are passed through the backing sheet 12 from the backing sheet 12 to the top sheet 11 and pulled out in the back direction. (In the direction of the absorbent core 3). By projecting the periphery of the hole 13 toward the absorbent core 3 in this manner, the liquid in the groove 17 can be easily guided from the hole 13 to the absorbent core 3.

As another method for forming the holes 13, a nonwoven fabric sheet having a raised portion 16 formed between a roll having a large number of pins formed on its surface and a flat roll, or a raised sheet is provided. The nonwoven fabric sheet before forming the part 16 is supplied, and the rolls are rotated with a difference in peripheral speed.
As a result, the pins scratch the nonwoven fabric sheet, and the elongated holes 13 can be formed in the nonwoven fabric. In this case, when the peripheral speed of one roll is V1 and the peripheral speed of the other roll is V2, the peripheral speed ratio represented by (V2−V1) / V1 is preferably in the range of 10 to 60%.

In the embodiment shown in FIGS. 2 and 4, the partition area 15 surrounded by the arrangement lines L1 and L2 has a diamond shape.
The acute angle is directed in the vertical direction (Y direction). Therefore, the groove 17 provided along the arrangement lines L1 and L2 is
It extends obliquely in the horizontal direction while extending in the vertical direction. Therefore, even if the liquid immediately before the permeation of the liquid in the hole 13 moves along the groove 17, the liquid does not directly flow in the vertical direction or the horizontal direction, and the diffusion of the liquid to a wide area can be prevented. In addition, since the raised portions 16 formed in the diamond-shaped sectioned region 15 are also vertically long, the individual raised portions 16 are moved by relative movement of the wearer's skin and the sanitary napkin 1 in the horizontal direction (X direction). It is easy to deform flexibly in the lateral direction.

As described above, in order to effectively prevent the liquid from spreading in the vertical direction and the horizontal direction and to easily follow the movement of the wearer's skin in the horizontal direction, it is necessary to set the inner angle θ of the acute angle of the rhombus. Is preferably in the range of 20 to 70 degrees. When the diamonds formed at such angles are arranged, the surface layer 10 appears to be sewn, and the visual product quality is also excellent.

In order that each of the raised portions has an appropriate contact area with the skin, each of the raised portions 16 has a cushion, and can be flexibly deformed in the lateral direction, an arrangement line L is provided.
1, the distance between the intersections of L2 (the length of one side of the diamond) La is 3 to
A range of 20 mm is preferable, and more preferably 3 to 15 m
m, especially in the range of 5 to 12 mm. The area of the divided areas 15 is preferably 9～400Mm ^2, it is further preferably in the range of 20 to 200 mm ^2. Further, the ratio of the area of the upper surface 16a of the raised portion 16 to the area of the partition region 15 is preferably 60% or more.

The width Wa of the groove 17 is preferably in the range of 2 to 8 mm, more preferably 2 to 5 mm. By setting the width to the above range, it becomes easy to function as a liquid transport path. Further, the number of the holes 13 within the length La of one side is preferably 2 or more and 5 or less. By providing two or more, the protrusions 16 to the groove 17
Liquid flowing to the absorbent core 3 can be surely guided,
By reducing the number to five or less, a decrease in the strength of the groove 17 can be avoided.

One sheet, namely, the top sheet 1
1 and the backing sheet 12, the height H from the sheet back surface of the groove portion 17 to the upper surface 16a of the raised portion 16 is preferably in the range of 0.5 to 5 mm, more preferably 0.5 to 5 mm.
It is in the range of 5 to 2 mm. If it exceeds the above range, the elastic strength of the raised portion 16 decreases, and the resilience when deformed is inferior. If it is less than the above range, it is difficult to form the space 18 inside, and the cushioning property of the raised portion 16 is reduced. Decrease.

As a characteristic of each of the top sheet 11 and the back sheet 12 on which the ridges 16 were formed, a pressure of 4.9 kPa was applied in the thickness direction by a KES texture tester manufactured by Kato Tech. When the compression ratio is 3
By setting the content in the range of 0 to 80%, more preferably in the range of 30 to 60%, an excellent texture can be obtained. If it is less than the above range, the shape maintaining characteristics of the raised portion 16 will be reduced and it will be easy to be flat, and if it exceeds the above range, it may give a rigid feeling.

In the above embodiment, the top sheet 1
If 1 is formed to have the above-mentioned dimensions and the above-mentioned characteristics, sufficient cushioning properties can be obtained without providing the backing sheet 12.

Next, FIG. 5 is a partial plan view showing a pattern of the surface layer 20 of the absorbent article according to the second embodiment of the present invention.

The surface layer 20 shown in FIG. 5 is also a layer in which the topsheet 11 and the backing sheet 12 are overlapped, or is formed only from the topsheet 11. In this embodiment, each raised portion 26 is circular (or may be oval or oval). A groove 27 is formed so as to surround the protruding portion 26, and the protruding portion 26 is formed by the groove 27.
Are separated to be independent. The hole 23 is formed at the bottom of the groove 27.

In this embodiment, the most protruding portion 2 of each of the holes 23 formed in the groove 27 surrounding the protruding portion 26 is described.
The inner area of a circle (or an ellipse or an ellipse) having the smallest diameter passing through the edge of the hole 23 on the side of the protrusion 26 located on the side 6 is the partition area 25. The diameter D of the section area 25 is 3 to
A range of 20 mm is preferable, and more preferably 3 to 15 m
m, especially in the range of 5 to 12 mm. The area of the divided areas 25 is preferably 7～314Mm ^2, it is further preferably in the range of 20 to 200 mm ^2. The ratio of the area of the upper surface of the raised portion 26 to the area of the partition region 25 is preferably 60% or more.

Also in this embodiment, the raised portion 26 has a cushioning property, and the liquid given to the groove 27
3 rapidly permeates the absorbent core 3.

FIG. 6 is a partial sectional view showing an absorbent article (sanitary napkin) according to a third embodiment of the present invention.

In this embodiment, the surface layer 20 shown in FIG. 2, FIG. 3, and FIG.
Surface layer 30 which is set on top
Is formed. That is, the top sheet 11 shown in FIGS. 2 and 3 is a backing sheet, and the backing sheet 12 shown in FIGS. 2 and 3 is a top sheet.

The portion where the raised portion 16 is formed in FIGS. 2 and 3 becomes a substantially diamond-shaped depressed portion 31 and the groove 1 is formed.
The portion forming 7 becomes the ridge portion 32. And ridge 3
2, holes 13 are formed along the arrangement lines L1 and L2.

In this embodiment, the elements such as the angles of the arrangement lines L1 and L2 and the dimensions of the divided area 15 are the same as those in the first embodiment shown in FIGS.

In this case, both the sheet 12 located on the front side and the sheet 11 located on the back side may be made of a hydrophobic nonwoven fabric, or a hydrophilic gradient may be imparted by including only the sheet 12 with hydrophilic fibers. Is also good. Seats 11 and 12
Both contain hydrophilic fibers, or both sheets 1
1 and 12 may be formed of hydrophobic fibers subjected to hydrophilic treatment.

In the embodiment shown in FIG. 6, when the liquid is applied to the depression 31, the liquid is absorbed by the absorbent core 3 located immediately below and immediately passes through the sheets 11 and 12 to absorb the liquid. Provided to core 3. When the fiber density of the ridges 32 is higher than the fiber density of the depressions 31, the liquid applied to the depressions 31 is absorbed by the ridges 32 and the absorbent core 3 It is led to. The liquid supplied to the ridge 32 penetrates the hole 13 and is guided into the ridge 32. Also, when a viscous substance, a cell, or the like is given to the depression 31, these are retained in the depression 31,
It can be prevented from moving in both vertical and horizontal directions.

Further, the ridges 32 are raised in a rhombic pattern or a circular pattern, so that the ridges 32 are uniformly in contact with the skin. The ridges 32 have a space inside, so that cushioning and elastic recovery are achieved. And the ridge portion 32 has elastic recovery even when it falls down in the width direction. Therefore, the contact with the skin is soft and there is little irritation to the skin. Further, even if the liquid remains in the depression 31, the liquid is kept away from the skin by the presence of the ridges 32, and this liquid is also removed by the difference in fiber density.
, It can reduce the feeling of wetness and stuffiness.

The production directions of the surface layers 10, 20, 30 are as follows: a roll on which the convex portion of the pattern of the raised portion (depressed portion) is formed; And a nonwoven fabric sheet (one sheet 11, or two stacked sheets 11, 12) is supplied between the two rolls, and the roll pressure is set to 49 to 294N.
To form a raised portion (depressed portion) in the nonwoven fabric sheet. At this time, it is preferable to press the sheet between the convex portion and the concave portion and compress the sheet at the groove portion (ridge portion) to increase the fiber density at this portion.

Thereafter, the sheet is supplied between a roll having pins arranged in a pattern synchronized with the concavo-convex pattern and a roll having a flat surface to form holes.

Alternatively, the hole may be formed by winding a sheet formed with irregularities around a roll on which the pins are arranged.

After the hole is formed with the pin, the unevenness may be formed, or the unevenness may be formed and the opening of the hole may be performed simultaneously.

The liquid-permeable film can be used not only as a sanitary napkin but also as a surface material for disposable diapers or urine absorbing pads, and further for panty liners.

[0071]

As described above, in the absorbent article of the present invention, since the surface material is formed of a nonwoven fabric and has cushioning properties, the contact with the skin is soft. In addition, the liquid can be guided to the grooves and ridges and quickly supplied to the absorbent core from the holes.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an absorbent article according to the present invention.

FIG. 2 shows a surface layer according to the first embodiment;
Cross-sectional perspective view of line II,

FIG. 3 is a sectional view taken along the line II-II,

FIG. 4 is a partial plan view showing an uneven pattern of the surface layer;

FIG. 5 is a partial plan view showing a concavo-convex pattern of a topsheet according to a second embodiment of the present invention;

FIG. 6 is a partial cross-sectional view showing an absorbent article according to a second embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Back sheet 3 Absorbent core 5 Side sheet 6 Leak prevention wall 7 Elastic member 10, 20 Surface layer 13, 23 Hole 15, 25 Partition area 16, 26 Raised part 17, 27 Groove part 31 Depressed part 32 Ridge Department

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A61F 13/539 (72) Inventor Kazuya Nishitani 1531-7 Takasuka Wadahama, Toyohama-cho, Mitoyo-gun, Kagawa Unicharm F-term in Technical Center Co., Ltd. (reference) 3B029 BB03 BB06 4C003 BA03 BA04 DA01 HA06 4C098 AA09 CC05 CC07 CC11 CE06 DD03 DD04 DD10 DD25 4L047 AA14 AA16 AA21 AA27 BA03 BA08 CA06 CA07 CB07 CC04 CC05 EA02 EA10

Claims (12)

[Claims] 1. An absorbent article having a back sheet, a liquid-permeable surface layer, and a liquid absorbing layer interposed between the back sheet and the surface layer, wherein the surface layer is formed of a nonwoven fabric. And the surface layer comprises:
A protruding portion having a predetermined area protruding in a convex shape on the front surface side, and a groove portion surrounding each of the protruding portions and continuously formed so as to divide each of the protruding portions, the cross section is formed in an uneven shape. And an aperture for liquid permeation is formed in the groove. 2. The absorbent article according to claim 1, wherein a space is formed on the back side of the raised portion. 3. The absorbent article according to claim 1, wherein the fiber density of the groove is higher than the fiber density of the raised part. 4. An absorbent article having a back sheet, a liquid permeable surface layer, and a liquid absorbing layer interposed between the back sheet and the surface layer, wherein the surface layer is a liquid permeable nonwoven fabric. Wherein the surface layer has a depression having a predetermined area which is depressed toward the liquid absorbing layer, and a ridge which is formed continuously so as to surround each depression and separate each depression. An absorbent article having a cross section formed in an uneven shape, and a hole for liquid permeation formed in the ridge. 5. The absorbent article according to claim 4, wherein the fiber density of the ridge is higher than the fiber density of the depression. 6. In the groove or the ridge, the holes are arranged so as to surround the ridge or the depression, and the arrangement line of the holes is a rhombus, and the acute angle of the rhombus is The absorbent article according to any one of claims 1 to 5, wherein the absorbent article is oriented in a longitudinal direction of the absorbent article, and the acute angle is 20 to 70 degrees. 7. The absorbent article according to claim 6, wherein one side of the rhombus formed by the arrangement lines has a length of 3 to 20 mm. 8. In the groove or the ridge, the holes are arranged so as to surround the protrusion or the depression, and include the protrusion or the depression surrounded by the hole. the absorbent article according to the area of the region, with claim 1 which is 9~400mm ² 7 of. 9. The absorbent article according to claim 1, wherein the bulk of the surface layer is 0.5 to 5 mm. 10. A compressibility of 30 to 80 when a pressure of 4.9 kPa is applied to the surface layer by using a KES texture tester.
% Of the absorbent article according to any one of claims 1 to 9. 11. The surface layer according to claim 1, wherein at least a portion of the surface layer having irregularities is formed by stacking at least two nonwoven fabrics, and each of the nonwoven fabrics has the irregular shape. 3. The absorbent article according to claim 1. 12. The absorbent article according to claim 11, wherein the hydrophilicity of the backing nonwoven fabric is higher than the hydrophilicity of the surface nonwoven fabric.