JP2002253610A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a pored plastic sheet used as a surface sheet for a sanitary napkin or the like in sticking to skin, stimulation to the skin by a surface sheet formed out of a nonwoven fabric having furrows and poorness in the permeability of liquids. SOLUTION: In a liquid receiving layer covering a liquid absorption layer 3, a surface sheet 11 and a support sheet 12 are laminated and a number of liquid passage holes 13 are formed piercing both the sheets. In the non-joint area 15, the surface sheet 11 and the support sheet 12 are not joined and moreover, rise upward. As a result, the liquid is absorbed quickly by the liquid absorption layer 3 from the liquid passage holes 13. A sheet of the non-joint area 15 is soft in touch on the skin with the cushioning performance and elasticity thereof thus developed.

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, etc., and particularly those having good liquid permeability and being soft to the wearer's skin. The present invention relates to an absorbent article that can provide a sense of contact.

[0002]

2. Description of the Related Art Some liquid-receiving layers provided on the surface of absorbent articles such as sanitary napkins and disposable diapers use an apertured plastic sheet.

[0003] In this type of perforated plastic sheet, a resin plastic sheet 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 suction pressure inside the screen drum causes the resin to soften. A hole corresponding to the drum hole is formed in the resin plastic sheet, and at the same time, the periphery of the opening is protruded to one side of the plastic sheet to form a liquid guide tube.

When an apertured plastic sheet is used as the liquid receiving layer, the liquid applied to the surface of the plastic sheet passes through the apertures and is absorbed by the liquid absorbing layer. Further, by whitening the perforated plastic sheet, there is an effect that the color of liquid such as menstrual blood absorbed in the liquid absorbing layer can be shielded.

The liquid receiving layer is made of an air-through non-woven fabric having a relatively large bulk and is formed by alternately forming ridges and grooves extending linearly. That are arranged in the vertical direction are 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, when a large amount of liquid is applied to the surface of the liquid receiving layer using the perforated plastic sheet, all the liquid is quickly introduced from the perforations to the liquid absorbing layer. And liquid may remain on the plastic sheet surface. When the liquid remains on the surface of the plastic sheet, the liquid flows along the surface of the plastic sheet in the longitudinal direction and the lateral direction of the absorbent article, easily giving the wearer's skin a feeling of wetness, and from the surface of the absorbent component in the lateral direction. Fluid leakage may also occur.

Further, as the above-mentioned perforated plastic sheet, there is a plastic sheet in which a liquid guide tube facing the liquid absorbing layer is formed at an edge portion of the hole. Such a liquid guide tube is dispersed as a relatively rigid portion. Therefore, the perforated plastic sheet tends to give a rigid feeling (rough contact feeling) to the wearer's skin.

Further, when the surface material is formed of a nonwoven fabric having ridges and grooves, the liquid easily flows in the longitudinal direction of the absorbent article along the grooves, so that 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]

According to a first aspect of the present invention, there is provided a back sheet, a liquid receiving layer located on the front side, and a liquid absorbing layer interposed between the back sheet and the liquid receiving layer. In the absorbent article, the liquid-receiving layer has at least one layer of a liquid-permeable top sheet and at least one layer of a liquid-permeable support sheet stacked on the back side of the top sheet, and And a liquid passage hole passing through the support sheet is formed, a hole array area where the liquid passage holes are arranged along a line, or a hole dense area where the liquid passage holes are densely provided,
The hole array region or the hole dense region intersects each other to form an independent region surrounded by the hole array region or the hole dense region, and the topsheet and the support sheet include at least the liquid The surface sheet and the support sheet are substantially not joined to each other in at least a part of the independent region.

In the first aspect, the liquid is transmitted to both the top sheet and the support sheet to be provided to the liquid absorbing layer, and is also allowed to pass through the liquid passage hole passing through the top sheet and the support sheet. Can be. Therefore, the liquid residue on the surface is reduced. Further, the areas where the liquid passage holes are not formed are independent of each other, and in each of the independent areas, the top sheet and the support sheet are overlapped with each other to be soft, and the top sheet and the support sheet are soft. Are not joined, the topsheet can move with the skin, making it difficult for the wearer to feel a rigid feeling on the skin.

According to a second aspect of the present invention, there is provided an absorbent article having a back sheet, a liquid receiving layer located on the front side, and a liquid absorbing layer interposed between the back sheet and the liquid receiving layer. The liquid receiving layer has a surface sheet formed of a liquid-permeable apertured plastic sheet, and at least one layer of a liquid-permeable support sheet stacked on the back side of the surface sheet. A liquid passage hole penetrating through the support sheet is formed, the top sheet and the support sheet are joined at least around the liquid passage hole, and the opening area of each liquid passage hole is equal to the opening area. It is characterized in that it is larger than the opening area of each hole of the plastic sheet.

In the second aspect of the present invention, the liquid penetrates both the top sheet of the perforated plastic sheet and the support sheet and is provided to the liquid absorbing layer, and the liquid passage hole penetrating through the top sheet and the support sheet. The liquid can be permeated from the surface. Therefore, liquid residue on the surface of the perforated plastic sheet is reduced. Further, in a region where the liquid passage hole is not formed, the top sheet and the support sheet are overlapped with each other and are soft, so that it is difficult for the wearer to feel a rigid feeling to the skin.

In the above, the support sheet may be a perforated plastic sheet, or the support sheet may be a fiber sheet.

In the second aspect of the present invention, for example, the liquid receiving layer is provided with a hole array region in which the liquid passage holes are arranged along a line or a hole dense region in which the liquid passage holes are dense.
In a portion surrounded by the hole array region or the hole dense region, a plurality of regions having a predetermined area without the liquid passage hole are provided.

Also in this case, it is preferable that the area having no liquid passage hole is a non-joining area where the topsheet and the support sheet are not joined.

In the liquid-receiving layer, it is preferable that the topsheet is raised in a direction away from the support sheet in a region not having the liquid-passing hole. It is preferable that the topsheet is raised in a direction away from the support sheet in a region surrounded by the arrangement region or the densely packed region.

In the above, the support sheet has elasticity and elasticity, and in a state where the support sheet is stretched, the support sheet and the top sheet are joined at least around the liquid passage hole. The display sheet may be configured such that the support sheet is contracted and the display sheet is raised.

Further, the hydrophilicity of the support sheet is preferably higher than the hydrophilicity of the topsheet.

In the present invention, the KES texture tester includes:
The compressibility of the liquid receiving layer when a pressure of 4.9 kPa is applied to the liquid receiving layer can be set to 30 to 80%.

[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 an enlarged sectional view showing the structure of the liquid receiving layer of the sanitary napkin, FIGS. 4 and 5 are enlarged sectional views showing modified examples of the structure of the liquid receiving layer, and FIGS. Is an enlarged plan view of a liquid receiving layer of the sanitary napkin, and FIG. 7 is an enlarged plan view showing a second embodiment of the liquid receiving layer.

The sanitary napkin 1 shown in FIG. 1 has a liquid impermeable layer 3 in the central region of the upper surface of a liquid impermeable back sheet 2. The upper surface of the liquid absorbing layer 3 is covered with a liquid receiving layer 10, and the liquid receiving layer 10 extends outside the liquid absorbing layer 3 and is joined to the back sheet 2.

Side sheets 5 and 5 are provided on both left and right sides of the liquid receiving surface of the sanitary napkin 1. The side sheets 5, 5 are joined to the back sheet 2 on both left and right sides. Furthermore, side seats 5, 5 are 2
The folded portions are stacked on top of the liquid receiving layer 10 on the left and right outer sides of the liquid absorbing layer 3, and the side sheets 5, 5 are positioned on the liquid receiving side on the left and right outer sides of the liquid absorbing layer 3. Standing up, the leak-proof walls 6 and 6 are formed.

An elastic member 7 extending in the vertical direction (Y direction) is joined to each of the leakage preventing walls 6, 6. The side sheets 5, 5 forming the leak-proof walls 6, 6 are joined together on the liquid-receiving layer 10 in a state where the side sheets 5, 5 are folded at the longitudinal front and rear ends of the sanitary napkin 1. I have. Due to the contraction force of the elastic member 7, the sanitary napkin 1 is curved so that the back sheet 2 has a downwardly convex shape.
The leak prevention wall 6 can rise from the surface on the liquid receiving side of the sanitary napkin 1.

As shown in FIGS. 2 and 3, the liquid receiving layer 10
Is formed by superposing a top sheet 11 and a support sheet 12. The top sheet 11 and the support sheet 12
Are open plastic sheets, and the top sheet 1
1 has a large number of openings 11a, and the support sheet 12 also has a large number of openings 12a. And liquid receiving layer 1
At 0, a number of liquid passage holes 13 penetrating both the top sheet 11 and the support sheet 12 are formed. The opening end 13a of the liquid passage hole 13 projects in the direction of the liquid absorbing layer 3, and the inner peripheral surface of the liquid passage hole 13 extends to a predetermined length in the thickness direction of the liquid receiving layer 10, A liquid guide tube 13b is formed.

The inner diameter D of each liquid passage hole 13
Is sufficiently larger than the inner diameter d1 of the opening 11a of the topsheet 11 and the inner diameter d2 of the opening 12a of the support sheet 12. Therefore, the opening area of one liquid passage hole 13 is larger than the individual opening area of each of the openings 11a and 12a.

The topsheet 11 and the support sheet 12 are fusion-bonded to each other around the liquid passage hole 13, that is, at least at and near the opening end 13a. In a region where the liquid passage hole 13 is not formed, a non-bonding region 15 where the top sheet 11 and the support sheet 12 are not substantially bonded to each other is formed.

Here, the term “substantially not joined” in the present specification includes, of course, those in which the topsheet 11 and the support sheet 12 are completely separated in the non-joined area 15. However, in the non-joining area 15, the top sheet 11 and the supporting sheet 12 are unavoidable due to the manufacturing method.
This also includes the case where is slightly adhered. However, the top sheet 11 and the support sheet 12 that are slightly joined are cut into 1 inch widths, and the top sheet 11 and the support sheet 12 are cut.
In a direction perpendicular to the sheet surface and in a direction opposite to each other by 180 degrees with respect to both sheets 11 and 12 by 100 mm / m.
This means that the required load when peeled at a speed of in is 0.2 N or less.

Further, in the non-joining area 15, it is preferable that a slight space 14 shown in FIGS. 2 and 3 is formed between the topsheet 11 and the support sheet 12,
If the topsheet 11 and the support sheet 12 are not joined,
Both sheets may be in surface contact.

The liquid receiving layer 10 in the embodiment shown in FIG.
Then, as shown in FIG.
Are linearly arranged in rows. In FIG. 6, L1 and L2 indicate arrangement lines passing through the center lines of the liquid passage holes 13 arranged in a straight line. In addition, when the liquid passage holes 13 are not arranged in a single row, and the liquid passage holes 13 are arranged in a straight line in a plurality of rows within a band-like range of a predetermined width, or within the range of the predetermined width. When the liquid passage holes 13 are randomly arranged, the line passing through the center in the width direction of the band-shaped range where the liquid passage holes 13 are arranged is the arrangement line L1,
L2.

The band-shaped area having the predetermined width Wa in which the liquid passage holes 13 are arranged is defined by the hole arrangement areas 17a and 17b.
It is. The center line of the hole arrangement region 17a is the arrangement line L
1. The center line of the hole arrangement region 17b is the arrangement line L2. When the liquid passage holes 13 are arranged in a line as shown in FIG. 6, the width Wa of the hole arrangement regions 17a and 17b is set.
Is slightly larger than the inner diameter D of the liquid passage hole 13.

Since the topsheet 11 and the support sheet 12 are joined around the liquid passage hole 13, the topsheet 11 and the support sheet 12 are not separated in the hole arrangement areas 17a and 17b. Closely adhered.

As shown in FIG. 6, the arrangement lines L1 and L2
And a predetermined width Wa about these arrangement lines L1 and L2.
The hole arrangement regions 17a and 17b extend at an angle with respect to the vertical direction (Y direction).
A substantially rhombic region surrounded by a and 17b is the non-bonding region 15. In this non-joining area 15, the topsheet 11 and the support sheet 12 are mutually movable in the shearing direction so that they can be shifted from each other. However, the non-joining region 15 is not limited to a rhombus, and may be a parallelogram, a rectangle, a square, a pentagon, a hexagon, or the like.

In the hole arrangement regions 17a and 17b, since the topsheet 11 and the support sheet 12 are in close contact with each other as described above, the hole arrangement regions 17a and 17b are formed on the surface of the liquid receiving layer 10. The band-like non-joining area 15 has a shape in which the surface of the topsheet 11 is slightly raised in a rhombic shape in a direction away from the liquid absorbing layer 3.

The arrangement line L1 and the hole arrangement region 1
7a are provided in parallel at regular intervals, and the arrangement line L2 and the hole arrangement area 17b are also provided in parallel at regular intervals. Then, the hole arrangement area 17a
And the hole arrangement region 17b intersect with each other at many points. Therefore, the non-bonding region 15 having a substantially rhombic shape is used.
Are partitioned so as to be independent of each other.

In the sanitary napkin 1 shown in FIG. 1, the region within the range of the width W and the longitudinal length L where the liquid absorbing layer 3 exists is the main liquid absorbing region. The liquid passage hole 13 is formed in the entire absorption region, and the hole arrangement regions 17a, 17a and the non-joining region 15 are provided. However, the hole arrangement region 17 is provided only in the central region narrower than the liquid absorption region surrounded by the width W and the vertical length L.
a, 17b and the non-bonding region 15 may be formed, or the hole arrangement regions 17a, 17b and the non-bonding region 1 may be formed.
5 may be formed in a range extending to the outside of the liquid absorption region.

Sanitary napkin 1 using this liquid receiving layer 10
In this case, the liquid supplied to the liquid receiving layer 10 is filled with a large number of holes 11 of the topsheet 11 formed of a perforated plastic sheet.
a through a large number of apertures 12a of a support sheet 12 also formed of an apertured plastic sheet to form a liquid absorbing layer 3
Is absorbed by In addition, a part of the liquid applied to the surface of the liquid receiving layer 10 flows from the slightly raised surface of the non-bonding region 15 to the lower hole arrangement regions 17a and 17b. The liquid tends to flow along the hole arrangement regions 17a and 17b, but passes through the liquid passage hole 13 having a relatively large inner diameter D and is absorbed by the liquid absorption layer 3 during the flow.

Therefore, on the surface of the liquid receiving layer 10, the liquid is less likely to be saturated on the surface of the non-bonding region 15, and the liquid permeation capacity of the entire liquid receiving layer 10 can be increased. Also,
The hole arrangement regions 17a and 17b extend in a strip shape, and the liquid passage holes 13
Since the non-joining regions 15 having no surface are regularly arranged with a certain large area, if the surface sheet 11 is whitened, menstrual blood absorbed by the liquid absorbing layer 3 may be removed. The degree of concealment with respect to the color can be increased, and the wearer can be easily given a clean feeling.

Further, when both the top sheet 11 and the support sheet 12 forming the liquid receiving layer 10 are formed of perforated plastic sheets, the wet back from which the liquid from the liquid absorbing layer 3 oozes out to the surface of the liquid receiving layer 10 is formed. Easy to prevent.

Since the non-joining area 15 where the liquid passage hole 13 is not formed is slightly raised,
The non-joining area 15 contacts preferentially, and the rigidity of the liquid guide tube 13b formed around the liquid passage hole 13 is less likely to be directly transmitted to the skin. In the non-joining area 15, the topsheet 11 and the support sheet 12 are separated from each other. Therefore, when the topsheet 11 in the non-joining area 15 comes into close contact with the skin of the wearer, the topsheet 11 in the non-joining area 15 has a degree of freedom, and the wearer's skin is less likely to have a sense of resistance.

Further, as shown in FIG.
Are distributed independently at a plurality of locations surrounded by the hole arrangement regions 17a and 17b, so that it is easy to maintain a rhombic shape in each of the non-bonded regions 15, for example, the topsheet 11 is excessively shifted in the lateral direction. Therefore, it is not possible to fold and deform so as to overlap each other. Therefore, the opening 11a of the topsheet 11 is not closed by folding, and the liquid permeability does not decrease. In addition, the wearer does not feel discomfort in folding the topsheet 11.

As described above, in order to ensure that the contact area of each non-joined area 15 with the skin is appropriate and that the wearer does not feel the rigidity or uncomfortable feeling, it is necessary to set the distance between the intersections of the arrangement lines L1 and L2. The distance (length of one side of the diamond) La is preferably in the range of 3 to 20 mm, more preferably 3 to 15 mm, and particularly preferably 5 to 5 mm.
１２12 mm. Also, one non-bonding region 15
Is preferably 9 to 400 mm ² , and more preferably 20 to 400 mm ^2.
It is preferably in the range of ~ ²⁰⁰ mm2.

The number of the liquid passage holes 13 within the length La of one side is preferably two or more, and more preferably five or less. By providing two or more liquid passage holes 13, the liquid flowing from the non-joining region 15 to the hole arrangement regions 17 a and 17 b can be reliably guided to the liquid absorption layer 3. By setting the number to be equal to or less than the number, it is possible to avoid a decrease in the strength of the topsheet 11.

When the liquid flows along the hole arrangement regions 17a and 17b, the flow can be effectively prevented from being diffused in the vertical and horizontal directions.
In order for 1 to easily follow the lateral movement of the wearer's skin, 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 liquid receiving layer 10 looks as if it is sewn, and the visual product quality is also excellent.

One of the openings 11a of the topsheet 11
The opening area is 0.12 to 1.76 mm ^TwoCan be selected in the range
You. When selected in the above range, the surface sheet 11 is whitened.
Has the function of concealing the color of menstrual blood absorbed by the liquid absorbing layer 3.
I can help you.

The opening area of one opening 12a of the support sheet 12 formed of the opening plastic sheet may be the same as the opening area of the opening 11a of the topsheet 11, but the opening area of the one opening 12a may be the same. It is preferable that the opening area of the hole 12a is smaller than the opening area of the one opening 11a. For example, the opening area of one opening 12a can be selected in the range of 0.07 to 1.7 mm ² . When the opening area of the opening 12a of the support sheet 12 is made smaller than the opening area of the opening 11a of the topsheet 11, the support sheet 12 is whitened to absorb menstrual blood absorbed by the liquid absorbing layer 3. Color hiding function can be further enhanced.

The opening area of one of the liquid passage holes 13 penetrating the top sheet 11 and the support sheet 12 is 0.2 to 1
It can be selected in the range of 2.6 mm ² , but one liquid passage hole 1
The opening area of the opening 3 must be larger than the opening area of the opening 11a of the topsheet 11 and the opening area of the opening 12a of the support sheet 12.

The opening area ratio including both the opening 11a and the liquid passage hole 13 in the top sheet 11 and the opening area ratio including the opening 12a and the liquid passage hole 13 in the support sheet 12 are described. Can be selected in the range of 30 to 70%, and the opening area ratio of the support sheet 12 is preferably smaller than that of the top sheet 11.

The opening area ratio of the liquid passage hole 13 when limited to the region of the hole arrangement regions 17a and 17b is limited to the region of the non-bonding region 15 where the liquid passage hole 13 is not formed. Opening 11 of the topsheet 11
It is preferably at least 1.2 times, more preferably at least 1.5 times, the area ratio of a.

The perforated plastic sheet serving as the top sheet 11 and the support sheet 12 is made of PE (polyethylene),
It is formed of a thermoplastic resin such as PP (polypropylene) or PET (polyethylene terephthalate), and has a resin density of 0.88 to 0.93 g / cm, for example.
^{In 3} , the melt flow rate is selected from a polyethylene resin of 2 to 30 g / 10 min.

It is preferable that at least one of the top sheet 11 and the support sheet 12 contains an inorganic filler such as titanium oxide for whitening in a range of 1 to 10% by mass. In addition, it is preferable that at least the topsheet 11 has fine irregularities formed on its surface to reduce gloss and improve texture.

Further, the liquid given to the topsheet 11 is
In order to be drawn into the support sheet 12 side, the support sheet 12 needs to be subjected to a hydrophilic treatment. This hydrophilic treatment is performed by applying a surfactant to a plastic sheet or mixing the surfactant into a resin. Alternatively, a plastic sheet whose surface is treated with plasma discharge to improve wettability with a liquid is used. The front sheet 11 is also subjected to a hydrophilic treatment, and the hydrophilicity, that is, the affinity for the liquid, is preferably higher for the back sheet 12 than for the top sheet 11.

The opening 1 formed in the topsheet 11
The opening 1a is preferably formed in a liquid guide tube shape with an opening end 11b protruding in the direction of the support sheet 12, and the opening 12a formed in the support sheet 12 is likewise formed in the direction of the liquid absorbing layer 3. Those having a projecting liquid guide tube are preferred.

The film thickness of the plastic sheet is
Those having a range of 0.1 to 2 mm, preferably 0.3 to 1 mm are used. The basis weight is 15 to 40 g / m ^2.
Is more preferable, and more preferably 18 to 30 g / m
² If the plastic sheet in the above range is used, it is rich in elasticity and the individual openings 11a and 12a
It is easy to maintain the shape of the liquid guide tube.

In this method, a molten or semi-molten plastic sheet is fed onto a drum or a conveyor, the inside of a hole formed in the drum or the conveyor is set to a vacuum pressure, and the plastic sheet is drawn into the hole. Thus, it can be obtained by a method of forming an opening and a liquid guide tube.
Alternatively, an opening may be formed by penetrating the plastic film with a large number of pins provided on the roll surface, or applying a local tensile stress to the plastic film with a roller having fine irregularities to form a large number of locations. The plastic sheet may be broken to form a large number of holes.

The perforated plastic sheet may be a net-shaped plastic sheet having mesh-like perforations formed in a resin layer. Alternatively, the plastic sheet may be torn in the width direction to form a large number of slit-shaped openings.

In order to form the liquid passage holes 13 in the top sheet 11 and the support sheet 12, for example, as shown in FIG. 3, a drum 21 having pins 20 heated at a temperature of 90 to 1150 ° C. The heated pin 20 is made to penetrate both sheets 11 and 12 by sandwiching the top sheet 11 and the supporting sheet between the drum 23 having the sheet 22. At this time, the drum 21 has the arrangement lines L1 and L2 shown in FIG.
The same as that described above is used. By piercing both sheets 11 and 12 with the pins 20, a liquid passage hole 13 having a liquid guide tube 13b is formed, and both heat and heat formed around the liquid passage hole 13 by the heat are formed of a thermoplastic resin. Sheets 11 and 12 are heat-sealed.

Next, FIG. 4 shows another liquid receiving layer 10A used for the sanitary napkin 1 according to the first embodiment of the present invention. The liquid receiving layer 10A shown in FIG. 4 has a top sheet 11 and a support sheet 25 stacked on each other.

The topsheet 11 is the same as that shown in FIG. 3, and is formed of a perforated plastic sheet having perforations 11a. The support sheet 25 is a fiber sheet that is an aggregate of many fibers. In a state in which the top sheet 11, which is a perforated plastic sheet, is superimposed on the support sheet 25, for example, the heating pins 20 shown in FIG. It is formed. The fiber sheet serving as the support sheet 25 contains thermoplastic fibers, and the support sheet 25 and the top sheet 11 are fused by heat around the liquid passage holes 13.

Also in FIG. 4, the liquid passage holes 13 are arranged along the arrangement lines L1 and L2 shown in FIG.
Hole arrangement regions 17a and 17b are formed. In the non-bonding region 15 surrounded by the hole arrangement regions 17a and 17b,
The fiber sheet of the support sheet 25 and the perforated plastic sheet to be the top sheet 11 are substantially in a non-joined state.
In this case, in the non-bonding area 15, the topsheet 1
The space 14 may be formed between the support sheet 1 and the support sheet 25, or the top sheet 11 and the support sheet 25 may be in contact with each other.

However, in the hole arrangement regions 17a and 17b, since the top sheet 11 and the support sheet 25 are joined around the liquid passage holes 13, the fiber sheet serving as the support sheet 25 is compressed. is there. Therefore, the hole arrangement regions 17a and 17b become slightly flat, and the non-bonding region 15
Then, the topsheet 11 is provided with the hole arrangement areas 17a, 17b.
It has a more raised shape.

When the support sheet 25 is a fibrous sheet, the bulk of the liquid receiving layer 10 increases, the bulge in the non-bonding area 15 increases, and the support sheet 25 is worn when the topsheet 11 hits the skin of the wearer. This will give a soft feeling to the skin of the person.

In the liquid receiving layer 10A shown in FIG. 4, the liquid applied to the surface of the topsheet 11 penetrates through the opening 11a and reaches between the topsheet 11 and the fiber sheet of the support sheet 25. The liquid is absorbed by the liquid absorbing layer 3 by the capillary action. The liquid applied to the surface of the non-bonding region 15 reaches the hole arrangement regions 17a and 17b, and
And is absorbed by the liquid absorption layer 3.

At the opening end 13 a of the liquid passage hole 13, the support sheet 25 is thermally fused to the top sheet 11,
Since the fiber density of the support sheet 25 is high, the liquid easily passes through the liquid passage holes 13.

The support sheet 25 is formed by bonding a fiber web formed by a card method with hot embossing or hot air to form a sheet, an air-foam nonwoven fabric, or by laminating continuous filaments and bonding the fibers together to form a spunbond sheet. A nonwoven fabric, a spunlace nonwoven fabric in which fibers of a fiber web formed by a card method are entangled by a water flow, and the like can be used. Among these nonwoven fabrics, as a material having a bulky and rich elastic recovery force in the thickness direction, a fiber web was formed by a card method, and the fibers were joined by hot air suction,
Air-through nonwoven fabrics are preferred.

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

In order to obtain a whitening effect, if necessary, an inorganic filler such as titanium oxide may be added to the fiber 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 support sheet 25 can be made white, and the color of the liquid such as menstrual blood absorbed by the liquid absorbing layer 3 can be visually hidden.

The hydrophobic synthetic fibers forming the non-woven fabric of the support sheet 25 are formed on the surface of the support sheet 25 so that the liquid applied to the surface of the top sheet 11 can be easily drawn into the support sheet 25 through the openings 11a. Is hydrophilically treated, or the nonwoven fabric is formed of hydrophilic fibers such as regenerated cellulose fibers or natural cellulose fibers such as viscose rayon and acetate rayon, or a mixture of the hydrophilic fibers and hydrophobic synthetic fibers. It is preferred that Also in the embodiment shown in FIG. 4, it is preferable that the support sheet 25 has a higher hydrophilicity and a higher affinity for liquid than the topsheet 11.

Alternatively, the support sheet 25 is formed by laminating two non-woven fabrics, the non-woven fabric on the top sheet 11 is formed of hydrophobic synthetic fibers, and the non-woven fabric on the liquid absorbing layer 3 is a hydrophilic fiber or a hydrophilic treated fiber. The support sheet 25 is formed of the hydrophobic synthetic fiber thus formed, and the liquid absorbing layer 3 side has the topsheet 1
You may be comprised so that hydrophilicity may become higher than one side.

When the hydrophilic fiber is mixed with the hydrophobic synthetic fiber as the support sheet 25, the hydrophilic fiber is preferably used in an amount of 2 to 30 so as to have a moisture absorbing property and not to impair the elasticity of the nonwoven fabric sheet. It is preferable to mix them in a ratio of mass%.

The non-woven fabric material of the support sheet 25 preferably has cushioning properties and elasticity. Therefore, the bulk of the support sheet 25 is preferably in the range of 0.3 to 2.0 mm, more preferably 0.3 to 2.0 mm. 1.0 mm range,
Fineness is set to 1.1 to 4.4 dt to prevent formation unevenness.
ex, and the basis weight is preferably used in the range of ²⁰ to 150 g / m ² , and more preferably 25 to 100 g / m ^2.
It is preferred to be in the range of ² . In addition, in order to obtain cushioning and elasticity, the tensile strength of the nonwoven fabric forming the support sheet 25 is 1 inch in width and 10 mm between chucks.
The breaking strength in the longitudinal direction (Y direction) when pulled at 0 mm 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, the support sheet 25 can be formed of a nonwoven fabric having openings. The nonwoven fabric having the openings can be formed by defibrating the fibers of the nonwoven fabric by needling with heating. In this case, the average value of the inner diameter of one opening is preferably in the range of 0.3 to 2.0 mm. The open area is preferably 5 to 40%, and more preferably 7 to 15%.

FIGS. 5A and 5B show a manufacturing process of the liquid receiving layer 10B of another embodiment of the sanitary napkin 1 of the present invention.

In the liquid receiving layer 10B, the support sheet 26
Has elasticity in at least one of the vertical direction (Y direction) and the horizontal direction (X direction). For example, the support sheet 26
Forms open cells in a nonwoven fabric formed of a mixture of synthetic rubber or natural rubber such as urethane rubber or SEBS and hydrophilic fibers or hydrophilically treated hydrophobic synthetic fibers, or synthetic rubber such as urethane or SEBS. And a surfactant mixed with 1 to 5% by mass of a surfactant. Or, the support sheet 26
Is formed of a perforated plastic sheet or non-woven fabric, and a band-like or thread-like elastic elastic material extending in at least one of the longitudinal direction and the lateral direction is subjected to a strain (elongation) of 10 to 50% with respect to the plastic sheet or non-woven fabric. May be adhered in a state in which is provided.

As a result, the support sheet 26 is reduced by 30% in the vertical or horizontal direction, preferably in both the vertical and horizontal directions.
When the tensile strain is applied and the tensile force is subsequently removed, the strain is eliminated in the range of 60 to 98%.

As shown in FIG. 5 (A), the support sheet 26 is moved vertically or horizontally, preferably in both directions.
With the elongation of about 30%, the support sheet 26
A top sheet 11 of a perforated plastic sheet is laid on top of the liquid passage holes 1 so that the heated pins 20 shown in FIG. 3, for example, are pierced so that the arrangement pattern shown in FIG.
3 is formed, and the topsheet 11 and the support sheet 26 are fusion bonded at least around the liquid passage holes 13.

After that, when the tensile force applied to the support sheet 26 is removed and the support sheet 26 is contracted,
In the non-joining area 15, the topsheet 11 protrudes greatly away from the support sheet 26, and a space 27 is formed between the topsheet 11 and the support sheet 26.

When the liquid receiving layer 10B shown in FIG. 5 is used, the space 27 functions as a cushion, and when the topsheet 11 hits the skin, the wearer feels soft and cushioned. Further, the liquid that has passed through the openings 11 a of the topsheet 11 in the non-joining area 15 reaches the inside of the space 27 and immediately passes through the support sheet 26 and is absorbed by the liquid absorbing layer 3.

As described above, each of the liquid receiving layers 10, 10A, and 10B shown in FIGS. 3, 4, and 5 has a shape in which the surface of the non-bonding region 15 is raised.
The thickness H in the raised state of 0, 10A, and 10B is 0.5 to
The range of 5 mm is preferable, and more preferably 0.5 to 2 mm.
mm.

Further, the support sheet of the liquid receiving layer used in the present invention may be a hydrophilic foam material formed of a resin material other than the synthetic rubber, or a surface (surface) of a hydrophilic nonwoven fabric. The resin layer may be laminated on the surface facing the sheet 11) in a stripe shape, a mesh shape, a dot shape, or the like. When this laminate material is used, the liquid absorbed by the liquid absorbing layer 3 hardly returns to the top sheet 11 side.

Further, the liquid receiving layer of the present invention comprises the surface sheet 11
May be a hydrophilic non-woven fabric, an open non-woven fabric, or a non-woven fabric as described above in which a resin layer is laminated on the surface thereof, and a support sheet having any one of the above structures may be used. Further, the surface sheet and the support sheet may each have a structure of two or more layers.

The liquid receiving layers 10, 10A, 10B
Has a compressibility of 30 when a pressure of 4.9 kPa is applied in the thickness direction by a KES texture tester manufactured by Kato Tech.
An excellent texture can be obtained by setting the range to 80%, more preferably 30% to 60%. If it is less than the above range, the shape maintaining characteristics of the non-contact area 15 will be reduced and it will be easy to be flat, and if it exceeds the above range, it may give a rigid feeling.

Next, FIG. 7 is a partial plan view showing an arrangement pattern of the liquid passage holes 13 of the liquid receiving layer 10C in the absorbent article according to the second embodiment of the present invention.

The liquid receiving layer 10C shown in FIG. 7 also has a top sheet 11 and a supporting sheet 12 (or 25, 26) selected from the above-mentioned materials stacked.

In this embodiment, a large number of liquid passage holes 13
Are formed, and a substantially circular (or elliptical or oval) non-joining region 32 surrounded by the hole dense region 31 is regularly arranged.
As described above, in the hole dense area 31, at least a portion around the liquid passage hole 13 and the support sheet 12
(25, 26) are joined, so that the top sheet 11 and the support sheet 12 (2
5, 26) form a flat portion in close contact. In the circular non-joining area 32, the topsheet and the support sheet are not joined, and have a dome-like shape that is higher than the hole dense area 31.

The diameter D1 of the non-joining area 32 is m3 to 2
The range of 0 mm is preferable, and more preferably 3 to 15 m
m, especially in the range of 5 to 12 mm. The area of the non-bonding region 32 is preferably 7～314Mm ^2, it is further preferably in the range of 20 to 200 mm ^2.

The absorbent article of the present invention can be constituted not only as a sanitary napkin but also as a disposable diaper or urine absorbing pad, and further as a panty liner.

[0088]

As described above, in the absorbent article of the present invention, the liquid receiving layer is soft, has cushioning properties, and has a soft contact with the skin. In addition, the liquid can be quickly supplied from the liquid passage hole to the liquid absorbing layer.

[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 liquid-receiving layer according to the first embodiment;
Sectional view taken along line II,

FIG. 3 is an enlarged sectional view of a liquid receiving layer shown in FIG. 2;

FIG. 4 is an enlarged sectional view showing a modification of the liquid receiving layer.

FIGS. 5A and 5B are cross-sectional views showing another example of the liquid receiving layer in the order of the manufacturing process;

FIG. 6 is a partial plan view showing an example of an arrangement pattern of liquid passage holes in the liquid receiving layer.

FIG. 7 is a partial plan view showing another example of the arrangement pattern of the liquid passage holes in the liquid receiving layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Back sheet 3 Liquid absorption layer 5 Side sheet 6 Leak prevention wall 7 Elastic member 10, 10A, 10B Liquid receiving layer 11 Surface sheet 11a Opening 12 Support sheet 12a Opening 13 Liquid passage 15 Non-joining area 17a , 17b hole arrangement area 25, 26 support sheet 31 hole dense area 32 non-joining area

Claims (11)

[Claims] 1. An absorbent article having a back sheet, a liquid receiving layer located on the front side, and a liquid absorbing layer interposed between the back sheet and the liquid receiving layer, wherein the liquid receiving layer comprises: A liquid passage hole having at least one layer of liquid-permeable top sheet and at least one layer of liquid-permeable support sheet stacked on the back side of the top sheet, and penetrating the top sheet and the support sheet. Is formed, and a hole array region in which the liquid passage holes are arranged along a line, or a hole dense region in which the liquid passage holes are densely provided is provided, and the hole array region or the hole dense region intersects each other to form the hole. An independent area surrounded by an array area or the hole dense area is formed, and the top sheet and the support sheet are joined at least around the liquid passage hole, and at least a part of the independent area. The above table An absorbent article, wherein the face sheet and the support sheet are not substantially joined. 2. An absorbent article having a back sheet, a liquid receiving layer located on the front side, and a liquid absorbing layer interposed between the back sheet and the liquid receiving layer, wherein the liquid receiving layer comprises: A surface sheet formed of a liquid-perforated open plastic sheet, and at least one layer of a liquid-permeable support sheet stacked on the back side of the surface sheet,
A liquid passage hole penetrating the top sheet and the support sheet is formed, and the top sheet and the support sheet are joined at least around the liquid passage hole, and an opening area of each liquid passage hole. Is larger than the opening area of each hole of the perforated plastic sheet. 3. The absorbent article according to claim 2, wherein said support sheet is a perforated plastic sheet. 4. The absorbent article according to claim 2, wherein said support sheet is a fiber sheet. 5. The liquid receiving layer is provided with a hole array region in which the liquid passage holes are arranged along a line or a hole dense region in which the liquid passage holes are densely arranged, wherein the hole array region or the hole dense region is provided. The absorbent article according to any one of claims 2 to 4, wherein a region not having the liquid passage hole having a predetermined area is provided at a plurality of locations in a portion surrounded by. 6. The absorbent article according to claim 5, wherein the region having no liquid passage hole is a non-bonded region where the topsheet and the support sheet are not bonded. 7. The absorbent article according to claim 2, wherein, in the liquid receiving layer, the topsheet is raised in a region not having the liquid passage hole in a direction away from the support sheet. . 8. The liquid receiving layer, wherein the topsheet is raised in a direction away from the support sheet in a region surrounded by the hole arrangement region or the hole dense region.
The absorbent article according to any one of claims 5 and 6. 9. The support sheet has elasticity and elasticity, and in a state where the support sheet is stretched, the support sheet and the topsheet are joined at least around the liquid passage hole. The absorbent article according to claim 7, wherein the display sheet is raised by shrinking the sheet. 10. The absorbent article according to claim 1, wherein the hydrophilicity of the support sheet is higher than the hydrophilicity of the topsheet. 11. The compression rate of the liquid receiving layer when a pressure of 4.9 kPa is applied to the liquid receiving layer with a KES texture tester is 30 to 80%. Absorbent articles.