JP4953735B2 - Absorbent article and manufacturing method thereof - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, incontinence pads, etc., for absorbing menstrual blood, vaginal discharge, urine, and the like, and more specifically, absorbent articles having wing portions on both sides of the absorbent main body. And an efficient manufacturing method thereof.

Conventionally, as absorbent articles such as sanitary napkins, panty liners, incontinence pads, etc., a vertically long absorbent main body having a liquid-retaining absorbent layer and a liquid-impermeable leak-proof layer, on both sides of the absorbent main body What has a pair of wing part provided is known.
The wing portion prevents misalignment and twisting of the absorbent article during use, and prevents the underwear such as shorts for fixing the absorbent article from becoming dirty.
In general, the wing portion is provided with an adhesive portion on one side of the non-skin side, and when the absorbent article is fixed to the shorts or the like, the wing portion is bent along the side edge of the crotch portion, and the shorts are interposed through the adhesive portion. It is fixed to the non-skin facing surface such as.

The structure of the wing part in the conventional absorbent article comprises a non-woven sheet or perforated film constituting the skin contact surface of the absorbent main body and a surface opposite to the skin contact surface of the absorbent main body. A liquid-impermeable sheet made of resin film is extended outward in the width direction of the absorbent main body to form a wing part, and an adhesive is applied to the liquid-impermeable sheet side of the wing part. Most of them are provided with an adhesive portion.
Moreover, in patent document 1, in order to improve the touch of a wing part and air permeability, the absorbent article which comprised the wing part only from the nonwoven fabric is proposed.

JP 2002-272786 A

In an absorbent article having a wing part composed of a conventional liquid-impermeable sheet and a non-woven sheet, when the wing part is wound around and fixed to the shorts, the folded part becomes hard and the base part of the foot is improper. There is a problem that the breathability is inferior because the film is provided with a pleasant feeling.
Moreover, like the absorbent article of patent document 1, when a wing part is comprised with one nonwoven fabric, although the softness and air permeability of a wing part are improved, it is comprised with one soft nonwoven fabric. For this reason, there has been a problem that the rigidity and waist of the nonwoven fabric are not obtained for neatly winding the wing part into the shorts, and it is difficult to smoothly perform the operation of winding the wing part into the shorts and mounting it.
Patent Document 1 discloses that a region excluding the base portion of the wing portion is subjected to a planar heat embossing process to form a nonwoven fabric in that portion, thereby improving the fixing property between the anti-slipping adhesive and the nonwoven fabric. Are listed. This heat embossing requires a wide embossed area in order to improve the fixability of the anti-displacement adhesive, and the wing nonwoven fabric is thin in order to emboss and integrate the entire thickness direction of the nonwoven fabric constituting the wing part. It becomes hard and the touch, softness and operability of the wing part are impaired.

  An object of the present invention is to provide an absorbent article that can eliminate the various disadvantages of the above-described prior art and an efficient manufacturing method thereof.

  The present invention relates to an absorbent article having a vertically long absorbent main body having an absorbent layer and a leak-proof layer, and a pair of wing parts provided on both sides of the absorbent main body. A laminated nonwoven fabric having a laminated structure, wherein the laminated nonwoven fabric is composed of an unembossed nonwoven fabric in the uppermost layer located on the skin side, and an embossed nonwoven fabric located in the lowermost layer located on the non-skin side. Is achieved by providing an absorbent article characterized by being integrated by embossing integrally applied to the laminated nonwoven fabric.

  Moreover, this invention is a manufacturing method of the said absorbent article, Comprising: The process of giving a 1st embossing using the embossing roll on the one side of the longitudinal direction of the strip | belt-shaped nonwoven fabric which is not embossed, 1st A step of folding the embossed portion and a portion not subjected to the first embossing to obtain a laminated nonwoven fabric, applying a second embossing to the laminated nonwoven fabric, and The step of partially integrating, the portion where the first embossing is not performed on the skin side when the laminated nonwoven fabric is made into an absorbent article, and the portion where the first embossing is performed on the non-skin side The manufacturing method of an absorbent article which comprises the process of fixing to the structural member of an absorptive main body so that may be located, and the process of cut | disconnecting this laminated nonwoven fabric so that the shape of a wing part may be produced is provided.

Moreover, this invention is a manufacturing method of the said absorbent article, Comprising: The process of giving a 1st embossing using the embossing roll to the center part or both sides of the longitudinal direction of the strip | belt-shaped nonwoven fabric which has not been embossed , A step of obtaining a laminated nonwoven fabric by folding the first embossed portion and the portion not subjected to the first embossing to obtain a laminated nonwoven fabric, applying a second embossing to the laminated nonwoven fabric , The step of partially integrating the upper and lower surfaces, the step of separating the laminated nonwoven fabric into two laminated nonwoven fabrics so as to produce the shape of the wing portion, respectively, and the laminated nonwoven fabric separated into two pieces, Alternatively, after cutting into a predetermined length, a portion not subjected to the first embossing is positioned on the skin side when the absorbent article is formed, and a portion subjected to the first embossing is positioned on the non-skin side . Like , Comprising the step of fixing the member constituting the side portions of the absorbent body, there is provided a method of manufacturing an absorbent article.

In the absorbent article of the present invention, the wing portion has a soft touch. Moreover, the wing part can be easily wound around shorts or the like and fixed, and the bent part generated at that time is also flexible and less likely to cause discomfort to the wearer. Moreover, it is excellent also in the transferability in the case of forming an adhesive part by transferring an adhesive to a nonwoven fabric.
According to the method for producing an absorbent article of the present invention, the absorbent article can be produced efficiently.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
As shown in FIGS. 1 and 2, a sanitary napkin 1 that is an embodiment of the absorbent article of the present invention has a vertically long structure including a liquid-retaining absorbent layer 2 and a liquid-impermeable leak-proof layer 3. It has the absorptive main body 4 and a pair of wing parts 6 and 6 provided on both sides in the longitudinal direction of the absorptive main body 4.

  As shown in FIG. 2, the absorbent layer 2 includes a liquid-permeable topsheet 21 and a liquid-retaining absorbent body 22, and the leak-proof layer 3 is a liquid-impermeable (including poorly permeable) back surface. It consists of a sheet 31. The absorber 22 is sandwiched and fixed between the top sheet 21 and the back sheet 31. The top sheet 21, the absorber 22 and the back sheet 31 are integrated to form the absorbent main body 4. On the side of the surface sheet 21 on both sides in the longitudinal direction of the absorbent main body 4, a side sheet 51 is arranged to form a leak-proof pocket 5. The leakproof pocket 5 has a free end 52 that can be separated from the topsheet 21 and a fixed end 53 that is formed by fixing the sidesheet 51 to the topsheet 21. The non-skin contact surface of the absorbent main body 4 is provided with a main body adhesive portion (not shown) used for joining with shorts.

Each wing part 6 in the napkin 1 of this embodiment consists of the laminated nonwoven fabric 61 which has a laminated structure of two layers, as shown in FIG. 2, as for this laminated nonwoven fabric 61, the uppermost layer located in the skin side is an unembossed nonwoven fabric. 62, and the lowermost layer located on the non-skin side is made of an embossed nonwoven fabric 63.
As shown in FIG. 2, the skin side and the non-skin side are the same side as the skin contact surface side (surface sheet side) of the absorbent main body 4 when the wing portion 6 is extended to the side of the absorbent main body 4. (Upper side in FIG. 2) is the skin side, and the same side as the non-skin contact surface side (back sheet side) of the absorbent main body 4 is the non-skin side.

  Further, the upper and lower surfaces of the laminated nonwoven fabric 61 are integrated by embossing integrally applied to the laminated nonwoven fabric 61 as shown in FIG. Hereinafter, this embossing (embossing integrally applied to the laminated nonwoven fabric and integrating the upper and lower surfaces of the laminated nonwoven fabric) is also referred to as integrated embossing (second embossing in the manufacturing method described later). Say.

The unembossed nonwoven fabric in the present invention is a nonwoven fabric that has not been embossed. However, regarding the unembossed nonwoven fabric, the embossing in a case where the embossing is not performed does not include the above-described integrated embossing.
The unembossed nonwoven fabric 62 is a spunlace nonwoven fabric which is a nonwoven fabric obtained by entanglement of the constituent fibers of the fiber web by high-pressure water flow treatment, and a nonwoven fabric obtained by heat-sealing the constituent fibers of the fiber web by hot air treatment. Examples thereof include an air-through nonwoven fabric and a resin-bonded nonwoven fabric which is a nonwoven fabric obtained by bonding constituent fibers of a fiber web with an adhesive.
The fiber web used for manufacturing these nonwoven fabrics can be manufactured by a card machine or an airlaid method in which fibers are stacked in a web shape in the air.
Among these, a spunlace nonwoven fabric and an air-through nonwoven fabric are preferable from the viewpoint of touch, and an air-through nonwoven fabric is more preferable in consideration of the operability and cost of wings due to a slight stretchability.

The constituent fiber of the unembossed nonwoven fabric 62 may be any of synthetic fiber, regenerated or semi-synthetic fiber, and natural fiber. Examples of synthetic fibers include polyolefin fibers made of polyolefin resins such as polyethylene and polypropylene, polyester fibers made of polyester resins such as polyethylene phthalate, polyamide fibers such as nylon, and composite fibers made of two or more resins. Examples of the composite fiber include polyethylene / polypropylene composite fiber and polyethylene / polyester composite fiber. Examples of recycled fibers or semi-synthetic fibers include rayon, cupra, and tencel. Examples of natural fibers include pulp fibers and cotton fibers. These fibers can be used alone or in combination of two or more.
Among these fibers, polyethylene / polypropylene composite fibers and polyethylene / polyester composite fibers are preferable from the viewpoint of touch and nonwoven fabric surface strength. The content ratio of the polyethylene / polypropylene composite fiber and the polyethylene / polyester composite fiber in the unembossed nonwoven fabric is preferably 30 to 100% by weight, particularly 50 to 100% by weight.

The unembossed nonwoven fabric 62 has a basis weight of 10 to 50 g / m ² , a density of 0.005 to 0.05 g / cm ³ , and a thickness of preferably 0.3 to ³ mm, more preferably, The basis weight is 15 to 30 g / m ² , the density is 0.007 to 0.03 g / cm ³ , and the thickness is 0.5 to 2 mm.
By making the basis weight of the unembossed nonwoven fabric 62 10 g / m ² or more, it becomes easy to stably produce the nonwoven fabric with a good texture, and by making the basis weight 50 g / m ² or less, it is related to wearing of the wing. The operability and cost can be reduced. By setting the density of the unembossed nonwoven fabric 62 to 0.005 g / cm ³ or more, the strength as the nonwoven fabric is sufficient, and the occurrence of fiber fluff or the like during use can be suppressed, and the density is 0.05 g / cm. ^By setting it to ³ or less, it is possible to prevent the nonwoven fabric from becoming too hard and feeling bad. By setting the thickness of the unembossed nonwoven fabric 62 to 0.3 mm or more, good cushioning properties can be obtained, and the touch can be improved, and by setting the thickness to 3 mm or less, the nonwoven fabric is supplied from the roll during production. When it does, the winding length of this roll becomes long and productivity becomes favorable.

The thickness etc. of the unembossed nonwoven fabric 62 are calculated | required as follows, respectively.
[Thickness]
A measurement sample (small piece of laminated nonwoven fabric 61) is cut out from the wing part. When cutting out the sample, the wing portion is cut at a portion where the adhesive 69 is not applied (for example, line AA in FIG. 1), and passes through the plurality of embossed portions 64 in the lower embossed nonwoven fabric 63. A cut surface (see FIG. 3A) is generated. Moreover, a sample is cut out so that the thickness of a nonwoven fabric may not change.
The cut sample was loaded with a flat plate so that a load of 2.5 g / cm ² was obtained. As shown to Fig.3 (a), a cut surface is observed with a microscope and the thickness (L1) of the unembossed nonwoven fabric which the 2nd emboss of the upper layer is not applied is measured. The thickness of 10 points in total was calculated, and the average value of 10 points was taken as the thickness of the upper unembossed nonwoven fabric. Depending on the type of non-woven fabric, there may be a portion of the surface with fiber fluff, but the measurement is made without including the thickness of the surface of the non-woven fabric.

[Basis weight]
The basis weight was measured by cutting the nonwoven fabric into a size of 10 cm × 10 cm, measuring its weight, and converting it to a weight of about 1 m ² . Ten samples were measured, and the average value was taken as the basis weight.
When measuring from a product with wings, the laminated nonwoven fabric constituting the wing portion is cut out from the product, and only the upper unembossed nonwoven fabric is peeled off from the laminated nonwoven fabric, and the area and weight of the unembossed nonwoven fabric are measured. From the measured weight and area, it was converted to a weight of about 1 m ² . Ten samples were measured, and the average value was taken as the basis weight. When an adhesive or a pressure-sensitive adhesive is attached to the upper unembossed nonwoven fabric, the pressure-sensitive adhesive is dissolved and removed with an organic solvent such as toluene, and then measured.

〔density〕
The density is the apparent density of the nonwoven fabric. The density was calculated from the basis weight and thickness measured as described above.
For example, if the basis weight is 20 g / m ² and the thickness is 1 mm,
Density = basis weight / 1 m ² around nonwoven volume = 20 g / (thickness 0.1cm × 100cm × 100cm) = a 0.02 g / cm ^3.

As the embossed nonwoven fabric 63, those obtained by embossing various nonwoven fabrics exemplified as the above-described unembossed nonwoven fabric 62 can be used. In addition to a heat roll nonwoven fabric, a spunbond nonwoven fabric, and a melt blown nonwoven fabric in which fibers are joined by embossing, a nonwoven fabric that is a composite of a spunbond nonwoven fabric and a melt blown nonwoven fabric can also be used.
The embossed non-woven fabric 63 was embossed on an air-through non-woven fabric made of polyethylene / polypropylene composite fiber or polyethylene / polyester composite fiber, from the viewpoint of non-woven fabric surface strength and transferability of the anti-slip adhesive 69 among various non-woven fabrics. Or polyolefin fibers such as polyethylene and polypropylene, polyester fibers, polyethylene / polypropylene composite fibers, heat roll non-woven fabric heat roll embossed on a fiber web made of polyethylene / polyester composite fibers, polyolefin fibers such as polyethylene and polypropylene, polyethylene / polypropylene A spunbonded nonwoven fabric made of polypropylene composite fiber or polyethylene / polyester composite fiber is preferred.

The embossed nonwoven fabric 63 has a portion 64 (hereinafter also referred to as an embossed portion) whose thickness is partially reduced by embossing, as shown in FIGS. 3 (a) and 3 (b).
In order to improve the flexibility of the wing portion, the embossed portion 64 has the same direction as the longitudinal direction of the absorbent main body (X direction in FIG. 1) and the same direction as the width direction of the absorbent main body (see FIG. 1). (Y direction of 1) is preferably formed discontinuously.

  The embossed portion 64 may be a portion that is simply compressed and densified, but the constituent fibers of the embossed nonwoven fabric 63 may be fused together by heat embossing, high frequency embossing, ultrasonic embossing, or the like. preferable.

  The embossed portion 64 is preferably distributed so that the area sufficiently small with respect to the area of the wing portion extends over the entire area of the embossed nonwoven fabric 63 that forms the wing portion 6. More preferably, it is uniformly distributed in a uniform pattern over the entire area to be formed. For example, small circular embossed portions can be uniformly distributed in a staggered pattern. The shape of each embossed portion 64 in plan view is preferably a circle or an ellipse, but may be an arbitrary shape such as a rectangle, a triangle, or a heart shape.

Further, the number of embossments per area of 10 cm ² is preferably about 5 to 50, and more preferably about 10 to 30. The area of each of the embossed portion 64, 0.005～0.3Cm ^2, it is preferred that especially 0.01~0.2cm ^2. The embossed area ratio (total area of the embossed portion per unit area of the nonwoven fabric) is preferably 2 to 50%, particularly preferably 3 to 30%.
Further, for the purpose of further improving the transferability of the slip stopper 69, the entire surface corresponding to the slip stopper 69 may be embossed.

The embossed nonwoven fabric 63 has a basis weight of 10 to 50 g / m ² , a density of 0.02 to 0.5 g / cm ³ , and a thickness of preferably 0.1 to 1.5 mm, more preferably More preferably, the basis weight is 15 to 30 g / m ² , the density is 0.03 to 0.3 g / cm ³ , and the thickness is 0.15 to 1.0 mm.
By setting the basis weight of the embossed nonwoven fabric 63 to 10 g / m ² or more, it becomes easy to stably produce the nonwoven fabric with good texture, and the strength becomes sufficient. On the other hand, by making the basis weight 50 g / m ² or less, the cost can be reduced. By setting the density of the embossed nonwoven fabric 63 to 0.02 g / cm ³ or more, the strength as the nonwoven fabric becomes sufficient, and by setting the density to 0.5 g / cm ³ or less, the nonwoven fabric becomes too hard and the touch becomes worse. Can be prevented. By setting the thickness of the embossed nonwoven fabric 63 to 0.1 mm or more, the slip-off preventing adhesive 69 can be prevented from slipping through the non-embossed nonwoven fabric, and by setting the thickness to 1.5 mm or less, the nonwoven fabric is supplied from the roll during production In this case, the winding length of the roll is increased, and the productivity is improved.

The thickness etc. of the embossed nonwoven fabric 63 are calculated | required as follows, respectively.
[Thickness]
A measurement sample (small piece of laminated nonwoven fabric 61) is cut out from the wing part. When cutting out the sample, the wing portion is cut at a portion where the adhesive 69 is not applied (for example, line AA in FIG. 1), and passes through the plurality of embossed portions 64 in the lower embossed nonwoven fabric 63. A cut surface (see FIG. 3A) is generated. Moreover, a sample is cut out so that the thickness of a nonwoven fabric may not change.
The cut sample was loaded with a flat plate so that a load of 2.5 g / cm ² was obtained. As shown in FIG. 3 (a), the cut surface was observed with a microscope, and the thickness L2 of the embossed nonwoven fabric in the lower layer was observed.
As shown in FIG. 3 (a), the cut surface is observed with a microscope, and the thickness L2 (see FIG. 3 (b)) of the embossed nonwoven fabric in the lower layer and the thickness L3 (see FIG. 3 (b)) of the embossed portion 64 are obtained. taking measurement. The thickness of the embossed nonwoven fabric was the average thickness of L2 and L3, and a total of 10 thicknesses L2 and L3 was obtained. The average value of 10 points of L2 and L3 was taken as the thickness of the lower embossed nonwoven fabric. Depending on the type of non-woven fabric, there may be a portion of the surface with fiber fluff, but the measurement is made without including the thickness of the surface of the non-woven fabric.

[Basis weight]
The basis weight was measured by cutting the nonwoven fabric into a size of 10 cm × 10 cm, measuring its weight, and converting it to a weight of about 1 m ² . Ten samples were measured, and the average value was taken as the basis weight.
When measuring from a product main body with a wing, the laminated nonwoven fabric which comprises a wing part is cut out from a product, Furthermore, only the embossed nonwoven fabric of a lower layer is peeled from a laminated nonwoven fabric, and the area and weight of the embossed nonwoven fabric are measured. The lower layer embossed non-woven fabric is coated with an anti-displacement adhesive 69. After dissolving and removing the adhesive 69 with an organic solvent such as toluene, it is converted to a weight of about 1 m ² from the measured weight and area. did. Ten samples were measured, and the average value was taken as the basis weight.

〔density〕
The density is the apparent density of the nonwoven fabric. The density was calculated from the basis weight and thickness measured as described above.
For example, if the basis weight is 20 g / m ² and the average thickness of L2 and L3 is 1 mm,
Density = basis weight / 1 m ² around nonwoven volume = 20 g / (thickness 0.1cm × 100cm × 100cm) = a 0.02 g / cm ^3.

The upper and lower surfaces of the laminated nonwoven fabric 61 are integrated by the above-described integrated embossing. The laminated nonwoven fabric 61 is formed with an embossed portion 65 (hereinafter also referred to as an integrated embossed portion 65) by this integrated embossing.
The integrated embossed portion 65 is preferably distributed so that the area sufficiently small with respect to the area of the wing portion extends over the entire area of the embossed nonwoven fabric 63 forming the wing portion 6. More preferably, it is uniformly distributed in a uniform pattern over the entire area where the portion 6 is formed. For example, the small circular integrated embossed portions 65 can be uniformly distributed in a staggered pattern. The shape of each integrated embossed portion 65 in plan view is preferably a circle or an ellipse, but may be an arbitrary shape such as a rectangle, a triangle, or a heart shape.

In the integrated embossed portion 65, the unembossed nonwoven fabric 62 on the skin side and the embossed nonwoven fabric 63 on the non-skin side are bonded to each other by thermal fusion of fibers by heat embossing, high frequency embossing, ultrasonic embossing, or the like. Preferably, when one or two or more third fiber sheets (nonwoven fabric or fiber web) are interposed between the two nonwoven fabrics 62, 63, all layers including the third fiber sheet are It is preferable that the fibers are bonded by thermal fusion.
Further, in the integrated embossed portion 65, the fusion is not performed uniformly, but the peripheral portion of the integrated embossed portion 65 is whiter than the center, or the white portion of the integrated embossed portion 65 is white in some places. It is preferable to have a weakly fused portion (or a portion where the fiber shape remains) that can be recognized by appearance, such as being arranged, from the viewpoint of stable bonding between the laminated nonwoven fabrics.

  In addition, the interlayer of the laminated nonwoven fabric 61 in this embodiment is integrated only by integrated embossing, and the upper and lower surfaces of the laminated nonwoven fabric 61 are partially integrated in the thickness direction in the planar direction of the laminated nonwoven fabric 61. Yes. The laminated nonwoven fabric 61 according to the present invention may be such that the upper and lower surfaces are partially bonded by such integrated embossing and the layers are further bonded by an adhesive (not shown) disposed between the layers. good. In this case, the adhesive may be applied without any gaps over the entire area where the wing portion 6 is formed, but it is preferable that the adhesive is applied with a pattern. Examples of the pattern coating pattern include spiral patterns, dot patterns, stripe patterns (striped patterns), lattice patterns, checkered patterns, and the like.

The area ratio of the embossed portion 64 in the embossed nonwoven fabric 63 (total area of the embossed portion per unit area of the embossed nonwoven fabric) is preferably 2 to 50%, particularly 3 to 30%, and the integrated embossed portion in the laminated nonwoven fabric 61 The area ratio of 65 is preferably 1 to 30%, particularly preferably 3 to 20%.
It is preferable that the area ratio of the embossed portion 64 is within the above range because the slippage-preventing agent can be easily transferred to the nonwoven fabric, and the bending rigidity of the wing nonwoven fabric does not become too hard. Further, when the area ratio of the integrated embossed portion 65 is in the above range, it is preferable as the adhesive strength of the upper layer and the lower layer nonwoven fabric and the touch of the wing surface.
The area ratio of the integrated embossed portion 65 is preferably such that the area ratio of the embossed portion 64 is lower than 64, and the ratio of the area ratio a of the embossed portion 64 to the area ratio b of the integrated embossed portion 65 (b / a). Is preferably from 0.2 to 0.9, particularly from 0.3 to 0.8 from the viewpoint of the touch of the wing and the operability of the wing.

In addition, in the plane direction of the laminated nonwoven fabric, the position of the embossed portion 64 of the embossed nonwoven fabric overlaps with the position of the integrated embossed 65, and even if it is visually impossible to determine the presence of the embossed portion 64, When it is found from the regular arrangement pattern of the embossed portions 64 in the portion where they do not overlap that the embossed portions 64 existed before the integrated embossing, the embossed portions 64 are also As what exists, the area ratio of the embossed part 64 mentioned above and the number of the embossed 64 per 10 cm < ² > area are calculated.

In the integrated embossed portion 65, as shown in FIG. 3A, the depth D1 of the skin-side recess 65a is preferably deeper than the depth D2 of the non-skin-side recess 65b. By setting D1> D2, the laminated nonwoven fabric 61 can be easily folded to the non-skin side, and the wing portion 6 can be more easily wound and fixed.
The depth D1 of the skin-side recess 65a is preferably 0.2 to 2.5 mm, more preferably 0.5 to 2.0 mm. The depth D2 of the non-skin side recess 65b is preferably 0 to 1.0 mm, and more preferably 0 to 0.5 mm. The ratio of the depths of the skin-side and non-skin-side recesses (D2 / D1) is preferably 0 to 0.7, particularly preferably 0 to 0.5.
By making D2 / D1 as described above, it is preferable to easily wind in shorts and improve wearability.
The depth D1 and the depth D2 are measured by measuring the depth under no load from the cross section of the sample using a high scope by cutting the laminated nonwoven fabric so that a cross section passing through the integrated embossed portion is generated. To do. Let the average value of the measured value of a total of 10 points be D1 or D2. Further, D2 of 0 means that there is no non-skin-side recess 65b.

The number of integrated embosses 65 per area of 10 cm ² is preferably about 1 to 30, more preferably about 3 to 20.
Moreover, it is preferable that the area of each integrated embossed part 65 is 0.005-0.3, especially 0.01-0.2 cm < ² >.

The laminated nonwoven fabric 61 is a nonwoven fabric having a two-layer structure in which an unembossed nonwoven fabric 62 and an embossed nonwoven fabric 63 are laminated as in the present embodiment. Both the unembossed nonwoven fabric 62 and the embossed nonwoven fabric 63 are hydrophobic. It is preferable that it consists of a synthetic fiber.
Since all the nonwoven fabrics constituting the laminated nonwoven fabric 61 are made of hydrophobic synthetic fibers, blood is prevented from oozing out from both sides of the napkin, and the leakage preventing effect is improved. The upper unembossed non-woven fabric can be made hydrophilic and the lower embossed non-woven fabric can be preferably used as a hydrophobic non-woven fabric so that even if a small amount of blood leaks into the wing.
As the hydrophobic synthetic fiber, polyethylene, polypropylene, polyethylene / polypropylene composite fiber, polyethylene / polyester composite fiber, or the like can be used. Hydrophobic synthetic fibers are made to exhibit the inherent hydrophobicity of the resin by a method for producing a nonwoven fabric that does not have a surfactant on its surface, such as a spunbond method or a melt blow method, or the resin itself is hydrophobic. The purpose of further hydrophobizing the fiber, and a method of applying a hydrophobic treatment agent on the surface to make the fiber surface made of hydrophilic resin hydrophobic, or kneading a hydrophobic treatment agent into the resin and spinning it, etc. It may be made hydrophobic by. Hydrophobic fibers are preferably treated with a hydrophobic fiberizing oil such as silicone, fluorine or paraffin.

In the sanitary napkin 1 of this embodiment, since the skin side of the wing part 6 consists of the laminated nonwoven fabric 61 which consists of the unembossed nonwoven fabric 62, the wing part 6 has a soft touch. On the other hand, the non-skin side of the wing portion is made of an embossed non-woven fabric 63, and the wing portion 6 has sufficient strength and waist. Therefore, the wing portion 6 can be easily wound around shorts or the like. In addition, the bent portion generated at that time is also flexible and less likely to cause discomfort. Also, since the integrated embossed portion 65 is formed in the laminated nonwoven fabric 61 and the upper layer and the lower layer nonwoven fabric are partially integrated, the strength and waist of the wing are improved while maintaining the touch of the wing, and wing shorts are achieved. The ease of entrainment is also improved.
Further, the non-skin side of the wing portion 6 is made of an embossed nonwoven fabric 63, and the surface strength of the nonwoven fabric fiber is higher and the fiber density is higher than the non-embossed nonwoven fabric 62 on the skin side. When the wing portion adhesive portion for fixing the wing portion is formed on one side of the wing portion 6, the adhesive 69 has excellent transferability.
Also, when a woman puts on shorts, if the wings are too entangled and the wing adhesive part on one side adheres to the wing nonwoven fabric on the other side, the wing surface side is too low to adhere and peel off There is no trouble.

  Further, when the integrated embossed portion 65 is formed at a distance from the embossed portion 65, the laminated nonwoven fabric is more easily wound along the shape of the side portion of the shorts by the embossed portion 65 on the lower layer side, and the adhesive 69 It is easy to follow the deformation of the shorts at the part, and the upper layer side is more stretchable than the lower layer nonwoven fabric between the integrated embossed parts 65, so that the shape of the shorts side part is wound more gently than the lower layer, and the deformation of the shorts However, the movement of the whole wing part is eased. As a result, the softness at the side of the shorts and the mounting stability of the napkin are improved.

  In the sanitary napkin 1 of this embodiment, as shown in FIG.1 and FIG.2, the laminated nonwoven fabric 61 which comprises the wing part 6 is a heat seal, an ultrasonic wave in the outer side of the side edge part of the absorber 22 a little. The back sheet 31 is joined and integrated by a seal or the like. The joint portion 41 in which the laminated nonwoven fabric 61 is joined to the back sheet 31 extends in a curved line shape in the longitudinal direction of the absorbent main body 4, and each of the unembossed nonwoven fabric 62 and the embossed nonwoven fabric 63 described above exceeds the joint portion 41. The napkin 1 extends inward in the width direction. And the extension part of each of the unembossed nonwoven fabric 62 and the embossed nonwoven fabric 63 is mutually continuous in the free end 52 vicinity of the leak-proof pocket 5 mentioned above. In the example shown in FIG. 2, the two layers of nonwoven fabric are not joined between the fixed end 53 and the free end 52 of the leak-proof pocket 5.

  In addition, as the adhesive 69 for forming the top sheet 21, the absorber 22, the back sheet 31, and the wing part adhesive part in the sanitary napkin 1, those conventionally used for this type of article should be used without particular limitation. Can do.

Next, an embodiment (also referred to as a first embodiment) of a method for producing an absorbent article of the present invention will be described. The napkin manufactured in the first embodiment has the same structure as that of the napkin 1 described above except that the sheet material constituting the leak-proof pocket 5 has the structure shown in FIG. 6 between the fixed end 53 and the free end 52. Have
In the manufacturing method of the first embodiment, first, as shown in FIG. 4 (a), while continuously transporting the non-embossed belt-shaped nonwoven fabric 60 over the entire width, on one side in the longitudinal direction, The embossing roll 7 is used to perform hot embossing as the first embossing. The embossing roll 7 has convex portions formed on the peripheral surface in the form of dots. Between the embossing roll 7 and an anvil roll (not shown) having a smooth peripheral surface located on the opposite side across the nonwoven fabric 60. A plurality of embossed portions 64 are formed on one side of the strip-shaped nonwoven fabric 60 by partially heating and pressurizing the nonwoven fabric 60. In the nonwoven fabric 60 after the first embossing, the embossed portion 63 becomes an embossed nonwoven fabric, and the remaining portion 62 that has not been embossed becomes an unembossed nonwoven fabric (see FIG. 4B).

Next, as shown in FIG. 4 (c), the nonwoven fabric 60 after the first embossing is folded back so that the embossed portion 63 and the unembossed portion 62 overlap as shown in FIG. 4C. 61a. The laminated nonwoven fabric 61a at this stage is not joined between the portion 63 subjected to the first embossing and the portion 62 not subjected to the first embossing.
And the 2nd hot embossing as a 2nd embossing is given with respect to the laminated nonwoven fabric 61a, as shown in FIG.4 (d). Also in this hot embossing, the laminated nonwoven fabric 61 is partially heated and pressurized between an embossing roll 81 having convex portions formed in the form of dots on the peripheral surface and an anvil roll 82 having a smooth peripheral surface.
By this second embossing, the laminated nonwoven fabric 61 in which the upper and lower surfaces of the laminated nonwoven fabric 61a are integrated by the integrated embossed portion 65 is obtained [see FIG. 4 (e)].

And the obtained laminated nonwoven fabric 61 is cut | disconnected along a longitudinal direction, conveying continuously, and is divided | segmented into the two laminated nonwoven fabrics 61 (refer Fig.5 (a) (b)).
Then, the two laminated nonwoven fabrics 61 are each configured such that a portion 62 not subjected to embossing is on the skin side, and a portion 63 provided with embossing is on the non-skin side, so that the constituent members of the absorbent main body It fixes to the surface sheet 21 (refer FIG.5 (c)).
The laminated nonwoven fabric 61 is fixed to the topsheet 21 by overlapping the continuous side of the topsheet 21 and the side of the laminated nonwoven fabric 61 and performing a known joining process such as heat sealing on the overlapped portion. . By this joining, the fixed end 53 of the leakproof pocket 5 is formed.

And the surface sheet 21 which fixed the two laminated nonwoven fabrics 61 is laminated | stacked with the absorber 22 and the back surface sheet 31, and these predetermined locations are joined by heat seal etc. As shown in FIG.
Then, the obtained composite was punched into a napkin shape, and the front and rear ends 42 and 43 were joined by heat sealing or the like. In addition, at the time of this punching, each laminated nonwoven fabric 61 is cut | disconnected so that the shape of the wing part 6 may be produced.
Then, a hot melt pressure-sensitive adhesive is applied to one side of the wing portion 6 in the composite punched into a napkin shape to form the wing portion adhesive portion 25.
Thus, according to the manufacturing method of 1st Embodiment, 1 A of napkins which are one Embodiment of this invention can be manufactured efficiently.

  In addition, in the manufacturing method mentioned above, after fixing the laminated nonwoven fabric 61 to the surface sheet 21, the laminated nonwoven fabric 61 was cut | disconnected so that the shape of the wing part 6 might be produced, but the laminated nonwoven fabric 61 may produce the shape of the wing part 6. After cutting, it may be fixed to the topsheet 21 or the like. That is, in the production method of the present invention, either the step of fixing the laminated nonwoven fabric to the constituent member of the absorbent main body or the step of cutting the laminated nonwoven fabric so as to produce the shape of the wing portion may be performed before. good. Further, the constituent member of the absorbent main body to which the laminated nonwoven fabric 61 is fixed may be the back sheet 31 or the like instead of the top sheet 21, and is fixed to the top sheet 21 or the back sheet 31 in a single state. Instead, one or both of these and an absorber or the like may be integrated. The step of embossing the laminated nonwoven fabric 61a includes the step of fixing the laminated nonwoven fabric 61a to a constituent member of the absorbent main body such as the topsheet 21, and / or the shape of the laminated nonwoven fabric 61a in the wing portion. It may be carried out after the step of cutting so as to generate.

Next, 2nd and 3rd embodiment of the manufacturing method of the absorbent article of this invention is described with reference to FIG.
In 2nd Embodiment, embossing is carried out in the center part extended in the longitudinal direction of this strip-shaped nonwoven fabric 60 like 1st Embodiment, conveying continuously the strip-shaped nonwoven fabric 60 which has not been embossed over the full width. Apply.
In 3rd Embodiment, embossing is performed to the both sides of the longitudinal direction of this strip-shaped nonwoven fabric 60 like 1st Embodiment, conveying continuously the strip-shaped nonwoven fabric 60 which has not been embossed over the full width. Apply.
In FIG. 6, the nonwoven fabric 60 </ b> A is obtained by embossing the central portion in the longitudinal direction of the strip-shaped nonwoven fabric 60, and the nonwoven fabric 60 </ b> B is obtained by embossing both longitudinal portions of the strip-shaped nonwoven fabric 60.
And in any embodiment, the nonwoven fabrics 60A and 60B after embossing are folded back so that the embossed portion 63 and the uncoated portion 62 overlap, and the laminated nonwoven fabric 61a, the layers are not bonded to each other 61b.
And the 2nd embossing is given to those laminated nonwoven fabrics 61a and 61b similarly to the 2nd embossing in 1st Embodiment. Thereby, the laminated nonwoven fabric 61W in which the upper and lower surfaces of the laminated nonwoven fabrics 61a and 61b are integrated by the integrated embossed portion 65 is obtained.

In the second and third embodiments, each of the laminated nonwoven fabrics 61W produced in this way is cut into two laminated nonwoven fabrics 61 and 61 so as to form a wing portion in each of them. To do. A known cutting means is used for cutting.
And after cut | disconnecting the two laminated nonwoven fabrics 61 and 61 each separated into the size of one napkin, the part 62 where the embossing is not performed is the skin side, and the part 63 where the embossing is performed is non- It fixes to the surface sheet 21 or the back surface sheet 31 as a member which comprises the both sides of an absorptive main body by heat sealing etc. so that it may become the skin side. The two laminated nonwoven fabrics 61 and 61 produced by cutting can be joined to members constituting both sides of the absorbent main body without being cut into a predetermined length.
Then, the top sheet 21 or the back sheet 31 to which the laminated nonwoven fabric 61 is fixed is integrated with another member (not shown) such as an absorbent body constituting the absorbent article, and the wing formed by fixing the laminated nonwoven fabric 61. A wing portion adhesive portion 25 is formed on one side of the portion 6 to obtain a napkin 1B.

  The napkin 1B manufactured in the second and third embodiments is formed from a laminated nonwoven fabric 61 in which a laminated nonwoven fabric 61 is bonded to the topsheet 21 or the backsheet 31 and the wing portion 6 extends sideways. ing.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, the wing portion 6 in the sanitary napkin 1 described above is such that the unembossed nonwoven fabric 62 and the embossed nonwoven fabric 63 extend to the portion where the leak-proof pocket 5 is formed and are continuous at the extended portion. 6 and the napkin shown in FIG. 8, the unembossed nonwoven fabric 62 and the embossed nonwoven fabric 63 may be discontinuous.
Further, as shown in FIG. 9, a non-woven sheet 8 is arranged on the non-skin contact surface side of the back sheet 31 in the absorbent main body 4 so as to cross the absorbent body 22, and the sheet 8 and the leak-proof pocket 5. It is good also as each extending the sheet | seat 51 which forms a width direction outward of the absorptive main body 4, and making each extension part into the unembossed nonwoven fabric and embossed nonwoven fabric which comprise the laminated nonwoven fabric 61.

Moreover, although the laminated nonwoven fabric mentioned above showed the nonwoven fabric which embossed one piece of unembossed nonwoven fabric partially and laminated | stacked the unembossed nonwoven fabric and the embossed nonwoven fabric, each prepared the unembossed nonwoven fabric and the embossed nonwoven fabric of another member, respectively. And it is good also as a laminated nonwoven fabric.
The laminated nonwoven fabric is not limited to a two-layer structure, and may have a laminated structure of three or more layers in order to improve the cushion feeling and strength of the wing part. The non-embossed nonwoven fabric 62 constituting the uppermost layer on the skin side and the embossed nonwoven fabric 63 constituting the lowermost layer on the non-skin side are respectively unembossed nonwoven fabric 62 or embossed nonwoven fabric. It is preferable to use the same as 63 because the types of rolls do not increase in the processing step.
Moreover, in order to give a wing part absorbency, you may use the dry pulp sheet, the absorbent paper, etc. which manufactured pulp etc. by the dry type and the wet method between an unembossed nonwoven fabric and an embossed nonwoven fabric.

In addition to the sanitary napkin, the absorbent article of the present invention may be a panty liner, an incontinence pad, or the like.
Further, the description omitted in one embodiment of the present invention and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment are appropriately described in the embodiment. Can be substituted for each other.

FIG. 1 is a plan view showing a sanitary napkin which is an embodiment of the absorbent article of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. Fig.3 (a) is an expanded sectional view of the wing part of the sanitary napkin shown in FIG. 1, FIG.3 (b) is an expanded sectional view which shows only the embossed nonwoven fabric part of the lower layer of Fig.3 (a). . FIG. 4 is a schematic process diagram showing the first half of one embodiment of the method for producing an absorbent article of the present invention. FIG. 5 is a schematic process diagram showing the latter half of one embodiment of the method for producing an absorbent article of the present invention. FIG. 6 is a cross-sectional view (corresponding to FIG. 2) showing another embodiment of the absorbent article of the present invention. FIG. 7 is a schematic process diagram showing another embodiment of the method for producing an absorbent article of the present invention. FIG. 8 is a cross-sectional view (corresponding to FIG. 2) showing another embodiment of the absorbent article of the present invention. FIG. 9 is a cross-sectional view in the width direction showing still another embodiment of the absorbent article of the present invention.

Explanation of symbols

1 Sanitary napkin (absorbent article)
DESCRIPTION OF SYMBOLS 2 Absorbing layer 3 Leak-proof layer 4 Absorbent main body 5 Leak-proof pocket 6 Wing part 61 Laminated nonwoven fabric 62 Unembossed nonwoven fabric 63 Embossed nonwoven fabric 64 Embossed portion of embossed nonwoven fabric 65 Integrated embossed portion 7 Embossed roll

Claims (6)

In an absorbent article having a vertically long absorbent main body comprising an absorbent layer and a leak-proof layer, and a pair of wing portions provided on both sides of the absorbent main body,
The wing part is composed of a laminated nonwoven fabric having a laminated structure of two or more layers,
The laminated nonwoven fabric, the uppermost layer located on the skin side consists of an unembossed nonwoven fabric, the lowermost layer located on the non-skin side consists of an embossed nonwoven fabric,
The upper and lower surfaces of the laminated nonwoven fabric are integrated by embossing integrally applied to the laminated nonwoven fabric ,
The non embossed nonwoven had a basis weight of 10 to 50 g / m ^2, a density of 0.005~0.05g / cm ^3, a thickness of 0.3 to 3 mm,
The embossed nonwoven fabric had a basis weight of 10 to 50 g / m ^2, a density of 0.02 to 0.5 g / cm ^3, a thickness of 0.1 to 1.5 mm, the absorbent article.   In the embossed nonwoven fabric, the area ratio of the embossed portion is 2 to 50%, the area ratio of the embossed portion integrating the upper and lower surfaces of the laminated nonwoven fabric is 1 to 30%, and the area of the latter embossed portion The absorptive article according to claim 1 whose rate is lower than the area rate of the former embossed part.   3. The absorbent article according to claim 1, wherein the embossed portion where the upper and lower surfaces of the laminated nonwoven fabric are integrated has a skin-side recess depth deeper than the non-skin-side recess depth.   The absorbent article according to claim 3, wherein the depth of the concave portion on the skin side is 0.2 to 2.5 mm, and the depth of the concave portion on the non-skin side is 0 to 1.0 mm. A vertically long absorbent main body having an absorbent layer and a leak-proof layer, and a pair of wing portions provided on both sides of the absorbent main body,
The wing part is composed of a laminated nonwoven fabric having a laminated structure of two or more layers,
The laminated nonwoven fabric, the uppermost layer located on the skin side consists of an unembossed nonwoven fabric, the lowermost layer located on the non-skin side consists of an embossed nonwoven fabric,
A method of manufacturing an absorbent article in which the upper and lower surfaces of the laminated nonwoven fabric are integrated by embossing integrally applied to the laminated nonwoven fabric ,
A step of performing a first embossing process using an embossing roll on one side in the longitudinal direction of the strip-shaped nonwoven fabric that has not been embossed, a part that has been subjected to the first embossing process, and a part that has not been subjected to the first embossing process When the laminated nonwoven fabric is used as an absorbent article, a step of folding the laminated nonwoven fabric to obtain a laminated nonwoven fabric, applying a second embossing to the laminated nonwoven fabric, and integrating the top and bottom surfaces of the laminated nonwoven fabric A step of fixing to a constituent member of the absorbent main body so that a portion not subjected to the first embossing is positioned on the skin side and a portion embossing the first embossing is positioned on the non-skin side, and the lamination The manufacturing method of an absorbent article which comprises the process of cut | disconnecting a nonwoven fabric so that the shape of a wing part may be produced. A vertically long absorbent main body having an absorbent layer and a leak-proof layer, and a pair of wing portions provided on both sides of the absorbent main body,
The wing part is composed of a laminated nonwoven fabric having a laminated structure of two or more layers,
The laminated nonwoven fabric, the uppermost layer located on the skin side consists of an unembossed nonwoven fabric, the lowermost layer located on the non-skin side consists of an embossed nonwoven fabric,
A method of manufacturing an absorbent article in which the upper and lower surfaces of the laminated nonwoven fabric are integrated by embossing integrally applied to the laminated nonwoven fabric ,
A step of applying a first embossing using an embossing roll to the central part or both sides of the longitudinal direction of the strip-shaped nonwoven fabric not subjected to the embossing, a part subjected to the first embossing and the first embossing obtaining alms portions not and overlap so folded back laminated nonwoven, a second embossing applied to the laminated nonwoven fabric, the step of integrating between upper and lower surfaces of the laminated nonwoven fabric, a laminated nonwoven fabric, to its respective The step of separating into two laminated nonwoven fabrics so as to produce the shape of the wing portion, and the skin side when the laminated nonwoven fabric separated into two pieces is made into an absorbent article as it is or after being cut into a predetermined length as the first embossing performed portion to the first embossing not subjected to the portion positioned non-skin side is located, to include a step of fixing the member constituting the side portions of the absorbent body The manufacturing method of the absorbent article.

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