JP2008061664A - Absorbent article and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article which has a wing part, or a side flap, that has soft touch, is easily wrapped about shorts or the like to be fixed, and has a soft folding part that is made when being wrapped and hardly gives an unpleasant feeling to a wearer, and shows excellent loadabilities in forming an adhesive part by loading an adhesive to a nonwoven fabric. <P>SOLUTION: In the absorbent article 1 having a vertically long absorbent main body 4 equipped with an absorbent layer 2 and a leakage preventing layer 3 and a pair of wing parts 6, 6 provided on both sides of the absorbent main body 4, the wing part 6 is made of the laminated nonwoven fabric 61 having a laminated structure with at least two layers, and the laminated nonwoven fabric 61 has an uppermost layer which is located on the side of a skin and is made of a non-embossed nonwoven fabric 62 and a lowermost layer which is located on the non-skin facing side and is made of an embossed nonwoven fabric 63. <P>COPYRIGHT: (C)2008,JPO&INPIT

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 improves the fixability of the anti-displacement adhesive, but in order to emboss and emboss the entire thickness direction of the nonwoven fabric constituting the wing part, the wing nonwoven fabric becomes thinner and harder, the wing part feels soft, Operability is 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. An absorbent article, wherein the uppermost layer located on the skin side is made of an unembossed nonwoven fabric, and the lowermost layer located on the non-skin side is made of an embossed nonwoven fabric. By providing the above, the above object is achieved.

  Moreover, this invention is a manufacturing method of the said absorbent article, Comprising: The process of embossing using the embossing roll on the one side of the longitudinal direction of the strip | belt-shaped nonwoven fabric which has not been embossed, The part which embossed And a process of obtaining a laminated nonwoven fabric by folding the two together so that a portion not subjected to embossing overlaps, and a portion where the laminated nonwoven fabric is not embossed on the skin side when the laminated nonwoven fabric is made an absorbent article A step of fixing to a constituent member of the absorbent main body so that a portion that is positioned and embossed on the non-skin side is located, and a step of cutting the laminated nonwoven fabric so as to produce a shape of the wing portion; The manufacturing method of an absorbent article is provided.

  Further, the present invention is a method for manufacturing the absorbent article, the step of embossing using an embossing roll on the center or both sides of the longitudinal direction of the non-embossed strip nonwoven fabric, embossing The process of folding back and adhering both so that the part which gave the part and the part which has not been embossed overlap, and obtaining a laminated nonwoven fabric, these laminated nonwoven fabrics are laminated | stacked on two so that the shape of a wing part may be produced in each The process of separating into non-woven fabrics, and the non-embossed part on the skin side when the laminated non-woven fabrics separated into two pieces are cut as they are or after being cut into a predetermined length on the skin side. The manufacturing method of an absorbent article which comprises the process of fixing to the member which comprises the both sides of an absorptive main body so that the part which embossed on the skin side is located is provided.

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.

  The unembossed nonwoven fabric 62 is a nonwoven fabric that has not been embossed, and the embossed nonwoven fabric 63 is a nonwoven fabric that has been embossed. The embossing here does not include embossing that is integrally applied to the entire thickness of the laminated nonwoven fabric in order to bond the nonwoven fabrics constituting the laminated nonwoven fabric. The laminated nonwoven fabric 61 is preferably not subjected to such embossing for integration.

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 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 0.5 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 1 to 2.5 mm.
By making the basis weight of the unembossed nonwoven fabric 62 to be 10 g / m ² or more, it becomes easy to stably produce the nonwoven fabric with good texture, and by making the basis weight to be 50 g / m ² or less, it is related to bending 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 0.5 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 the sample is cut out, the wing portion is cut at a portion where the adhesive 65 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. 3A, the cut surface is observed with a microscope, and the thickness (L1) of the upper unembossed nonwoven fabric 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 calculated as a weight of about 1 m ² . Ten samples were measured, and the average value was taken as the basis weight. When the adhesive and the pressure-sensitive adhesive are adhered 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-displacement adhesive 65 among various non-woven fabrics. Or polyolefin fiber such as polyethylene and polypropylene, polyester fiber, polyethylene / polypropylene composite fiber, heat roll non-woven fabric heat roll embossed on fiber web made of polyethylene / polyester composite fiber, polyolefin fiber 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 thickened, but the constituent fibers of the embossed nonwoven fabric 63 are heat-sealed by heat embossing, high-frequency embossing, ultrasonic embossing, or the like. Is preferred.

  It is preferable that the embossed portion 64 has a sufficiently small area with respect to the area of the wing portion so that the embossed nonwoven fabric 63 is distributed so as to cover the entire area of the portion forming 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 enhancing the transferability of the anti-slipping adhesive 65, the entire surface corresponding to the anti-slipping adhesive 65 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 65 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 the sample is cut out, the wing portion is cut at a portion where the adhesive 65 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 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 anti-displacement adhesive 65 is applied to the lower layer embossed nonwoven fabric. After the adhesive 65 is dissolved and removed with an organic solvent such as toluene, the weight is converted to a weight of about 1 m ² from the measured weight and area. . 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.

From the viewpoint of improving the wrapping property of the wing part 6 in shorts or the like, the laminated nonwoven fabric 61 constituting the wing part 6 has the following conditions for the unembossed nonwoven fabric 62 constituting the uppermost layer and the embossed nonwoven fabric 63 constituting the lowermost layer: It is preferable to satisfy. The unembossed nonwoven fabric 62 and the embossed nonwoven fabric 63 constituting the lowermost layer each preferably have a basis weight of 10 to 50 g / m ² .
Unembossed nonwoven fabric 62: The elongation at 100 g / 50 mm load in the same direction as the width direction of the absorbent main body (Y direction in FIG. 1) is 10% or more, and particularly preferably 15 to 50%.
Embossed nonwoven fabric 63: Elongation at 100 g / 50 mm load in the same direction as the width direction of the absorbent main body (Y direction in FIG. 1) is 8% or less, particularly preferably 1 to 6%.

<Measurement method of elongation at 100 g / 50 mm load>
The same direction as the width direction of the absorbent main body is the direction in which the wing portion extends.
(1) The nonwoven fabric used for the upper layer and the lower layer is cut and measured so that the length in the same direction as the longitudinal direction of the absorbent main body is 50 mm and the length in the same direction as the width direction of the absorbent main body is 100 mm. A sample.
Using a Tensilon tensile tester, the measurement sample of the nonwoven fabric was stopped between 50 mm chucks so that the longitudinal direction was the tensile direction, pulled at a pulling speed of 300 mm / min, and stretched when pulled with a load of 100 g. Find the degree. That is, elongation at 100 g / 50 mm load = (stretched distance at 100 g load / nonwoven length 50 mm before stretching) × 100 (%). For example, if the extended distance is 6 mm when the weight is 100 g, the elongation when the weight is 100 g is 6/50 × 100 = 12%. The average value of N = 5 is obtained. “50 mm” when 100 g / 50 mm is applied is the width of the sample, and when the width of the sample is less than this, it is converted to a value of 50 mm width.
(2) When obtaining from a completed napkin or the like, the upper layer nonwoven fabric and the lower layer nonwoven fabric are peeled off cleanly, and the portion to which the adhesive 65 is attached is evaluated by dissolving and removing the adhesive with an organic solvent such as toluene. Moreover, when the required dimension cannot be taken, the following is performed. For example, when the width is only 25 mm, the weight corresponding to 100 g / 50 mm weight is 20 g / 10 mm, and when the width is 25 mm, the elongation at the time of 50 g / 25 mm weight is obtained. When the length is not 100 mm, for example, when the length is only 50 mm, the measurement is performed with the tensilon chuck narrowed. For example, in the case of a length of 50 mm, it is better to sandwich 10 mm or more in each case so that the chuck does not come off.
If the elongation when pulled at a load of 100 g / 50 mm is 3 mm, the elongation is 3 mm / 30 mm × 100 = 10%.

In the laminated nonwoven fabric 61, the nonwoven fabrics constituting the laminated nonwoven fabric 61 are preferably joined with an adhesive. As a method other than this adhesive, a web method or a non-woven fabric layer made of a card method or an airlaid method is used as an unembossed non-woven fabric layer, and after laminating with the embossed non-woven fabric, a heat-sealing component (binder component) is treated with hot air to join almost the entire surface. There is a method in which the nonwoven fabrics are heat-sealed and partially joined at the periphery of the wing.
In the laminated nonwoven fabric 61 in this embodiment, the unembossed nonwoven fabric 62 and the embossed nonwoven fabric 63 are joined by an adhesive (not shown). The adhesive may be applied to the entire area where the wing portion 6 is formed without any gap, but may be applied to the entire area where the wing portion 6 is formed. Examples of the pattern coating pattern include spiral patterns, dot patterns, stripe patterns (striped patterns), lattice patterns, checkered patterns, and the like.

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. 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 that of the unembossed 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 65 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.

  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 surface sheet 21, the absorber 22, the back sheet 31, and the anti-displacement adhesive 65 for forming the wing part adhesive part in the sanitary napkin 1, those conventionally used for this type of article are not particularly limited. Can be used.

  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. 5 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, Hot embossing is performed using the embossing roll 7. 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 belt-like nonwoven fabric 60 by partially heating and pressurizing the nonwoven fabric 60 [see FIG. 4 (b)]. In the embossed nonwoven fabric 60, 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. 4 (c)].
As the strip-shaped nonwoven fabric 60, one having 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 0.5 to ³ mm is preferably used. The applied portion 63 is preferably performed so that the basis weight is 10 to 50 g / m ² , the density is 0.02 to 0.5 g / cm ³ , and the thickness is 0.1 to 1.5 mm.

  Next, while continuously transporting the embossed nonwoven fabric 60, as shown in FIG. 4C, the embossed portion 63 and the non-embossed portion 62 are folded back so as to overlap each other. The laminated nonwoven fabric 61 is formed by bonding. In order to join the embossed portion 63 and the unexposed portion 62, a hot-melt adhesive or the like is applied to one or both of the opposing surfaces.

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.4 (d)).
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.4 (e)).
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 overlapping 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 this punching, each laminated nonwoven fabric 61 is cut so as to produce the shape of the wing portion 6.
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.

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.
In any of the embodiments, the nonwoven fabrics 60A and 60B after embossing are folded back so that the embossed portion 63 and the non-embossed portion 62 overlap, and the two are bonded to each other to laminate the nonwoven fabrics 61A and 61B. And In order to bond the embossed portion 63 and the unexposed portion 62, a hot-melt adhesive is applied to one or both of the opposing surfaces.

In the second and third embodiments, each of the laminated nonwoven fabrics 61A and 61B manufactured in this way is cut into two laminated nonwoven fabrics 61 and 61 so as to produce the shape of the wing portion respectively. Separate. 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 1 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. 5 and the napkin shown in FIG. 7, the non-embossed nonwoven fabric 62 and the embossed nonwoven fabric 63 may be discontinuous.
Further, as shown in FIG. 8, a non-woven fabric sheet 8 is arranged so as to cross the absorbent body 22 on the non-skin contact surface side of the back sheet 31 in the absorbent main body 4, 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 partially embossed one unembossed nonwoven fabric 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 portion. 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.

EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated in detail, this invention is not restrict | limited at all by the following example.
[Example 1]

A sanitary napkin was manufactured in the same manner as the manufacturing method of the first embodiment described above.
Specifically, a fiber web is obtained with a card machine from 100% PET / PE core-sheath type composite fiber (core: PET, sheath: PE) treated with a hydrophobic silicone oil, and then air-through hot air The fibers were bonded together by treatment to obtain an unembossed air-through nonwoven fabric. This air-through nonwoven fabric had a basis weight of 25 g / m ² , a nonwoven fabric density of 0.0167 g / cm ³ , a thickness of 1.5 mm, and an elongation at 25% of 100 g in the width direction.
This air-through nonwoven fabric was cut out with a width of 240 mm, and a 120 mm portion on one side was embossed in a dot shape with a hot embossing roll (embossing area ratio 5%), and an embossed nonwoven fabric on one side. The physical properties of the embossed nonwoven fabric were as follows: basis weight 25 g / m ² , nonwoven fabric density 0.125 g / cm ³ , thickness 0.2 mm, and 100 g in the width direction.
On the embossed nonwoven fabric 63, 3 g / m ² of hot melt was applied in a spiral shape, and one side (unembossed nonwoven fabric) that had not been embossed was folded and bonded to obtain a laminated nonwoven fabric.

The obtained laminated nonwoven fabric having a two-layer structure with a width of 120 mm is cut so as to have a width of 60 mm on the left and right at the center, and the skin side when the unembossed nonwoven fabric is used as a napkin, when the embossed nonwoven fabric is used as a napkin It overlapped on the both sides of the surface sheet so that it might become a non-skin side, and the overlapped part was heat-sealed and joined.
Next, the laminated sheet of the two laminated nonwoven fabrics and the top sheet are overlapped with the absorbent body and the back sheet, and a predetermined portion is joined. Then, as shown in FIG. 4 (d), the whole is cut into a wing shape, before and after the napkin Was heat sealed.
Next, a non-skin hot melt agent for fixing to the shorts was applied to the non-skin surface of the wing to form an adhesive part to obtain a sanitary napkin. Further, the wing portion was folded on the skin surface side of the absorbent main body, covered with release paper, and further wrapped with a packaging material to form individual bodies.
As the absorbent body, the back sheet and the packaging material, the same ones as those of a commercially available sanitary napkin manufactured by Kao Corporation (trade name “with Laurier Sarasara Cushion Wing”) were used.

[Example 2]
A fiber web is obtained with a card machine from 100% PET / PE core-sheath fiber (core: PET, sheath: PE) treated with a hydrophobic silicone oil, and then the fibers are bonded together by air-through hot air treatment. An unembossed air-through nonwoven fabric was obtained. This air-through nonwoven fabric had a thickness of 1.5 mm, a basis weight of 30 g / m ² , a nonwoven fabric density of 0.02 g / cm ³ , and an elongation at a load of 100 g in the width direction of 22%.
The air-through nonwoven fabric was cut out with a width of 120 mm.
Separately, PP / PE core-sheath fibers were produced by a spunbond method, and then the fibers were thermally bonded to each other by embossing to produce a spunbond nonwoven fabric. The properties of this spunbonded nonwoven fabric (embossed nonwoven fabric) were a thickness of 0.17 mm, a basis weight of 17 g / m ² , a nonwoven fabric density of 0.1 g / cm ³ , and a 100 g weightwise elongation at 5% in the width direction.
On this spunbonded nonwoven fabric, 3 g / m ² of a hot-melt adhesive in a spiral shape was applied, and the air-through nonwoven fabric was superimposed on the adhesive application surface and adhered.
The obtained laminated nonwoven fabric having a two-layer structure having a width of 120 mm was cut so as to have a width of 60 mm left and right at the center. A sanitary napkin individual package was obtained in the same manner as in Example 1 except that this 60 mm wide laminated nonwoven fabric was bonded to both sides of the topsheet.

Example 3
A sanitary napkin was manufactured in the same manner as the manufacturing method of the second embodiment described above.
Specifically, an unembossed air-through nonwoven fabric was obtained in the same manner as in Example 1. This air-through nonwoven fabric had a thickness of 1.5 mm, a basis weight of 25 g / m ² , a nonwoven fabric density of 0.0167 g / cm ³ , and a 100 g load elongation at 25% in the width direction.
The air-through nonwoven fabric was cut out with a width of 180 mm, and a portion with a center width of 90 mm centered on the central line extending in the longitudinal direction was embossed in a dot shape with a hot embossing roll (embossing area 5%), and the center was an embossed nonwoven fabric. . The physical properties of the embossed nonwoven fabric were as follows: thickness 0.2 mm, basis weight 25 g / m ² , nonwoven fabric density 0.125 g / cm ³ , and 100 g in the width direction.
On the embossed nonwoven fabric 63, 3 g / m ² of hot melt was applied in a spiral shape, and both side portions (unembossed nonwoven fabric) that had not been embossed were folded and bonded from the left and right to obtain a laminated nonwoven fabric.

As shown in FIG. 6, the obtained laminated nonwoven fabric having a two-layer structure with a width of 90 mm is cut and separated into two laminated nonwoven fabrics with a width of 60 mm so as to form the shape of the wings, respectively. Was laminated on both sides of the topsheet and joined by heat sealing so that the unembossed nonwoven fabric was the uppermost layer on the skin side and the embossed nonwoven fabric was the lowermost layer on the non-skin side.
Subsequently, the composite sheet of two laminated nonwoven fabrics and a surface sheet was piled up with the absorber and the back surface sheet, the predetermined location was joined, and the front and back of the napkin were heat-sealed.
Next, a non-skin hot melt agent for fixing to the shorts was applied to the non-skin surface of the wing to form an adhesive part to obtain a sanitary napkin. Further, the wing portion was folded on the skin surface side of the absorbent main body, covered with release paper, and further wrapped with a packaging material to form individual bodies.
As the absorbent body, the back sheet and the packaging material, the same ones as those of a commercially available sanitary napkin manufactured by Kao Corporation (trade name “with Laurier Sarasara Cushion Wing”) were used.

  In any of the sanitary napkins of the examples, the wing portion had a soft touch. Moreover, when fixed to the crotch part of a commercially available sanitary short, the wing part could be easily wound around the shorts and fixed, and the bent part produced at that time was also flexible.

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 an embodiment of a method for producing an absorbent article of the present invention. FIG. 5 is a cross-sectional view (corresponding to FIG. 2) showing another embodiment of the absorbent article of the present invention. FIG. 6 is a schematic process diagram showing another embodiment of the method for producing an absorbent article of the present invention. FIG. 7 is a cross-sectional view (corresponding to FIG. 2) showing another embodiment of the absorbent article of the present invention. FIG. 8 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 7 Embossed roll

Claims (7)

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,
In the laminated nonwoven fabric, the uppermost layer located on the skin side is made of an unembossed nonwoven fabric, and the lowermost layer located on the non-skin side is made of an embossed nonwoven fabric. The non embossed nonwoven had a basis weight of 10 to 50 g / m ^2, the density 0.005~0.05g / cm ^3, a thickness of 0.5 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, than said non-embossed nonwoven fabric The absorbent article according to claim 1, wherein the embossed nonwoven fabric has a high density. The unembossed nonwoven fabric has an elongation at the time of 100 g / 50 mm load in the same direction as the width direction of the absorbent main body of 10% or more,
The said embossed nonwoven fabric is an absorbent article of Claim 1 or 2 whose elongation at the time of 100g / 50mm load of the same direction as the width direction of the said absorptive main body is 8% or less. The laminated nonwoven fabric is a nonwoven fabric having a two-layer structure in which the unembossed nonwoven fabric and the embossed nonwoven fabric are laminated, and the unembossed nonwoven fabric and the embossed nonwoven fabric are both made of hydrophobic synthetic fibers. An absorbent article according to any one of the above. The absorbent article according to any one of claims 1 to 4, wherein the embossed nonwoven fabric is obtained by embossing the same nonwoven fabric as the unembossed nonwoven fabric. It is a manufacturing method of the absorptive article according to claim 1,
On one side in the longitudinal direction of the strip-shaped nonwoven fabric that has not been embossed, the step of embossing using an embossing roll, the part that has been embossed and the part that has not been embossed are folded so that they overlap. Adhering to obtain a laminated nonwoven fabric, the laminated nonwoven fabric is made into an absorbent article so that the part not embossed on the skin side is located and the part embossed on the non-skin side is located The manufacturing method of an absorbent article which comprises the process of fixing to the structural member of an absorptive main body, and the process of cut | disconnecting this laminated nonwoven fabric so that the shape of a wing part may be produced. It is a manufacturing method of the absorptive article according to claim 1,
The embossing process using the embossing roll, the embossed part and the unembossed part overlap each other at the center or both sides in the longitudinal direction of the strip-shaped nonwoven fabric that has not been embossed. A step of obtaining a laminated nonwoven fabric by folding the two together, a step of separating the laminated nonwoven fabric into two laminated nonwoven fabrics so as to form a wing portion in each of them, and a laminated nonwoven fabric separated into two, Absorbent so that the part that has not been embossed on the skin side and the part that has been embossed on the non-skin side is located on the skin side when cut as it is or after being cut to a predetermined length The manufacturing method of an absorbent article which comprises the process of fixing to the member which comprises the both sides of a main body.

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