JP2018000384A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which has low skin irritation, excellent in absorption performance, which has low reversion property and gentle on the skin.SOLUTION: An absorbent article comprises: a liquid permeable top sheet; a liquid impermeable back sheet; and an absorber arranged between the top sheet and the back sheet. A second sheet is arranged between the top sheet and the absorber, and the top sheet has no embossment pattern. The second sheet is formed of one layer of a nonwoven fabric, and the second sheet has a matched embossment pattern having three-dimensional recess parts and salient parts.SELECTED DRAWING: Figure 1

Description

  The present invention relates to absorbent articles such as light incontinence pads and liners.

  In general, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet. The body fluid such as is absorbed by the absorbent body through the top sheet. Here, conventionally, in absorbent articles, in order to improve the absorption performance and maintain a dry feeling on the surface of the top sheet even after absorption of body fluids, a non-woven fabric obtained by subjecting a fiber layer having a multilayer structure to uneven processing is used as the top sheet. Or an SAP sheet carrying a superabsorbent polymer or a bulky second sheet in the vicinity of the absorber. Among these, for the second sheet, by providing this, the transfer of body fluid from the top sheet side to the absorber is promoted, the absorption performance of the absorbent article is improved, and the reversal of the absorbed body fluid is also effective. And the top sheet can be kept dry.

  As an absorbent article in which the top sheet is subjected to uneven processing, for example, Patent Document 1 includes a top sheet, a second sheet, an absorbent body, and a back sheet. The top sheet and the second sheet are directed from the top sheet to the second sheet. Absorbent articles are disclosed that are associated with each other by predetermined recessed embossments.

  In addition, as an absorbent article provided with a second sheet, for example, in Patent Document 2, an absorbent article having a top sheet, a back sheet, and an absorbent body, a second article disposed between the top sheet and the absorbent body. An absorbent article is disclosed in which the LC value of the compression hardness in the compression characteristics of the KES compression test and the characteristics such as the thickness of the second sheet are adjusted.

JP 2014-198075 A Japanese Patent No. 4164416

  However, in the absorbent article of patent document 1, since the uneven | corrugated embossing pattern is provided in the top sheet, irritation | stimulation to skin may deteriorate. Moreover, in the absorbent article which provided the second sheet including the absorbent article of patent document 2, there exists a possibility that the bulkiness of a second sheet may be lost at the time of joining the top sheet and absorber at the time of manufacture, In such a case, there was a possibility that the absorption performance and reversibility of the absorbent article would deteriorate. Therefore, this invention is made | formed in view of the above subject, and it aims at providing the skin-friendly absorptive article with low skin irritation, excellent absorption performance, and low reversibility.

  The inventors of the present invention have conducted extensive research in view of the above problems. As a result, in the absorbent article having a top sheet, a back sheet, and an absorbent body, by giving a matched emboss pattern having a three-dimensional recess and projection to a second sheet made of a single layer of nonwoven fabric, The present inventors have found that the above problems can be solved and have completed the present invention. Specifically, the present invention provides the following.

  (1) A first aspect of the present invention is an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet. A second sheet is disposed between the top sheet and the absorbent body, the top sheet does not have an emboss pattern, and the second sheet is made of a single layer of non-woven fabric, and the second sheet Is an absorbent article having a matched emboss pattern having three-dimensional recesses and protrusions.

(2) A second aspect of the present invention is the absorbent article according to (1), wherein the second sheet has a basis weight of 15 g / m ² or more and 50 g / m ² or less, and the thickness of the second sheet. Is 0.3 mm or more and 1.0 mm or less.

  (3) A second aspect of the present invention is the absorbent article according to (1) or (2), wherein the matched emboss pattern of the second sheet is a honeycomb pattern. is there.

  (4) A fourth aspect of the present invention is the absorbent article according to any one of (1) to (3), wherein the area ratio of the concave portions of the matched emboss pattern of the second sheet is 5% or more. It is characterized by being 90% or less.

  (5) A fifth aspect of the present invention is the absorbent article according to any one of (1) to (4), wherein two second sheets made of one layer of nonwoven fabric are used, and two second sheets The sheet is laminated so that convex portions or concave portions on opposite surfaces overlap each other.

  (6) A fifth aspect of the present invention is the absorbent article according to any one of (1) to (5), wherein the nonwoven fabric sheet used for the second sheet is a composite fiber made of polyethylene and polypropylene. It is an air-through non-woven fabric configured or an air-through non-woven fabric composed of a composite fiber made of polyethylene and polyester.

  (7) A sixth aspect of the present invention is the absorbent article according to any one of (1) to (6), wherein the second sheet covers all or part of the upper surface of the absorbent body. It is characterized by being.

  In the absorbent article of the present invention, the top sheet does not have an embossed pattern and includes a second sheet made of a single layer of nonwoven fabric, and the second sheet has a matched embossed structure having three-dimensional recesses and protrusions. ) Has a pattern. For this reason, the skin irritation of the top sheet that touches the skin of the absorbent article is kept low, and the matched embossed pattern sufficiently maintains the bulkiness of the second sheet even after joining the top sheet and the absorbent body. Absorption performance of the absorbent article is improved, reversibility is suppressed to a low level, and the dry feeling of the top sheet after absorbing body fluid is improved. Therefore, according to the present invention, an absorbent article gentle to the skin can be provided.

It is drawing which shows the top view and sectional drawing of the absorbent article of this invention. It is drawing which shows the schematic diagram of the 2nd sheet | seat used for the absorbent article of this invention. It is drawing which shows the honeycomb pattern provided to a second sheet.

  Hereinafter, with reference to drawings, the absorptive article 1 concerning the embodiment of the present invention is explained in detail. In the description of the present embodiment, the same reference numerals are given to the same elements throughout. In the following description of the present specification, the body fluid refers to a liquid discharged from the body such as urine, blood, and water in soft stool. Furthermore, the time when the absorbent article 1 is worn means at least one of the time when the absorbent article 1 is attached and after the attachment. In addition, in description of this specification, the longitudinal direction of the absorbent article 1 is a direction over front and back of the wearer when the absorbent article 1 is worn, and is a direction indicated by a symbol Y in the figure. Moreover, the width direction of the absorbent article 1 is a direction that is transverse or orthogonal to the longitudinal direction, and is a direction indicated by a symbol X in the drawing. Furthermore, in this specification, the body contact side surface of the absorbent article 1 refers to the surface that comes into contact with the wearer's skin when the absorbent article 1 is worn, and the clothing contact side surface is the wear of the absorbent article 1. Sometimes refers to the surface that abuts the wearer's clothing. In this specification, the body contact side surface side of the absorbent article 1 may be referred to as the upper side, and the clothing contact side surface side may be referred to as the lower side.

<Absorbent article>
FIG. 1 is a plan view and a cross-sectional view of an absorbent article 1 of the present invention. The absorbent article 1 of the present invention has a liquid-permeable top sheet 10, a liquid-impermeable back sheet 30, and an absorbent body 20 disposed between the top sheet 10 and the back sheet 30. A second sheet 15 is disposed between the top sheet 10 and the absorbent body 20.

[Top sheet]
The top sheet 10 allows body fluid to pass quickly toward the absorbent body 20, and is disposed to face the back sheet 30 with the absorbent body 20 interposed therebetween. Since the top sheet 10 is a sheet that comes into contact with the skin, the substrate does not irritate the skin with a soft touch, for example, a nonwoven fabric such as a thermal bond nonwoven fabric typified by an air-through nonwoven fabric, a thermal bond / span It is formed from a material such as a composite nonwoven fabric in which bonds are laminated, an open film such as an open polyethylene film, a foam film such as polyethylene foam or urethane foam, or a composite sheet in which these are laminated. The top sheet 10 may be a single layer or may be laminated with a plurality of layers, and a large number of through holes may be formed to impart dry touch properties.

The nonwoven fabric was obtained by a known processing method such as a spunlace method or a spunbond method in addition to a thermal bond method using synthetic fibers such as polyethylene or polypropylene, recycled fibers such as rayon, and natural fibers such as cotton. Things can also be used. From the viewpoint of workability and strength, the basis weight of the top sheet 10 is preferably 18 g / m ² or more and 40 g / m ² or less. In order to reduce irritation to the skin, a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizer, and the like may be applied to the top sheet 10. The top sheet 10 may have a shape such as an hourglass shape or a substantially rectangular shape having a constricted portion at the center in the longitudinal direction where the wearer's crotch is positioned, and is slightly outward from the side edge of the absorbent body 20. It may extend and be provided.

  In the present invention, it is preferable that the top sheet 10 does not have an emboss pattern. As described above, when the top sheet 10 does not have an emboss pattern, the surface of the top sheet 10 becomes smooth, and the skin constituting the emboss pattern applied to the top sheet 10 is stimulated. Can be effectively prevented. The thickness of the top sheet 10 is preferably 0.20 mm or more and 0.50 mm or less, corresponding to the fact that the emboss pattern is not provided.

[Back sheet]
The back sheet 30 is made of a sheet material having liquid impermeability and water blocking properties so that body fluid does not leak outside the absorbent article 1, but even if it has moisture permeability to prevent stuffiness. Good. Examples of the material of the back sheet 30 having such characteristics include a thin plastic sheet such as a polyethylene sheet and a polyethylene laminated nonwoven fabric. The backsheet 30 may have a shape such as an hourglass shape or a substantially rectangular shape having a constricted portion at the longitudinal center where the wearer's crotch is positioned, and extends slightly outward from the side edge of the absorbent body 20. May be provided. An adhesive layer for fixing the absorbent article 1 to an underwear or the like may be provided on the clothing contact side surface of the back sheet 30. When the absorbent article 1 has an adhesive layer, the absorbent article 1 may have a release sheet for protecting the adhesive layer, and the release sheet may be integrated with the packaging sheet of the absorbent article 1. . The top sheet 10 and the back sheet 30 may form a flap that is fixed by a hot melt adhesive or heat seal without sandwiching the absorbent body 20 at least at a part of the end, such as an end in the longitudinal direction. Good.

[Absorber]
The absorbent body 20 contains an absorbent fiber as a base material and a superabsorbent polymer (hereinafter also referred to as SAP). The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers, and urine absorbing pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, hydrophilic paper Can be mentioned. Among these, it is preferable to use fluff pulp from the viewpoint of absorbability. Examples of such fluff pulp include wood pulp, synthetic fiber, polymer fiber, non-wood pulp and the like that have been fibrillated into cotton.

  The superabsorbent polymer of the absorbent body 20 is not particularly limited as long as it absorbs body fluids and can prevent backflow. Sodium polyacrylate, polyaspartate, (starch-acrylic acid) graft Those formed from materials such as a copolymer, (acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and saponified product thereof can be used. Among these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight.

  In the absorbent body 20, the absorbent fibers and SAP are preferably in the form of a laminated mat formed by mixing SAP particles in the absorbent fibers. Moreover, it is preferable to wrap the absorber 20 in a carrier sheet for the purpose of preventing leakage of SAP particles and stabilizing the shape of the absorber 20. The base material of the carrier sheet is not particularly limited as long as it has hydrophilicity, and examples thereof include hydrophilic nonwoven fabrics such as tissue, absorbent paper, and airlaid nonwoven fabric. In the case where a plurality of carrier sheets are provided, the base material of the carrier sheet may be the same or different.

  The absorber 20 may be formed by laminating an upper layer absorber and a lower layer absorber. In this case, the dimensions of the upper layer absorber and the lower layer absorber in the longitudinal direction and the width direction may be such that the size of the upper layer absorber is larger than the size of the lower layer absorber, and the size of the upper layer absorber is the same as the size of the lower layer absorber. The dimension of an upper layer absorber may be smaller than the dimension of a lower layer absorber.

[Second seat]
FIG. 2 is a drawing showing a schematic diagram of the second sheet 15 used in the absorbent article 1 of the present invention. In the absorbent article 1 of the present invention, the second sheet 15 is disposed between the top sheet 10 and the absorbent body 20. By disposing the second sheet 15 between the top sheet 10 and the absorbent body 20, the transfer of body fluid from the top sheet 10 side to the absorbent body 20 is promoted, and the absorbent performance of the absorbent article 1 is improved. In addition, the backflow of the absorbed body fluid is effectively prevented, and the top sheet 10 can be maintained in a dry state. The second sheet 15 is made of a fiber material, and is preferably made of a thermal bond nonwoven fabric that is an air-through nonwoven fabric. In addition, the fiber material constituting the second sheet 15 is preferably subjected to a hydrophilic treatment. Such a hydrophilization treatment maximizes the function of transferring body fluid to the absorbent body 20. In the present invention, the second sheet 15 is preferably made of a single layer of nonwoven fabric.

  The fiber material constituting the non-woven sheet that is the second sheet 15 is polypropylene, polyethylene, or polyester; composite fiber made of two or more materials such as polyester, polypropylene, polyethylene, or the like; natural fiber such as cellulose fiber, or a mixture thereof However, a composite fiber of low melting point polyester and polyester, polyester and polyethylene, or polypropylene and polyethylene is preferable from the viewpoint of strength and bulkiness. In the present invention, among these, it is preferable to use a composite fiber made of polyethylene and polypropylene, or a composite fiber made of polyethylene and polyester. Here, the composite fiber refers to a multi-component fiber in which one fiber is configured from at least two component fiber materials. From the arrangement of each fiber material, a sheath-core type, a parallel type, a sea-island type, a split type And so on. In the present invention, among these, it is particularly preferable to use a sheath-core type composite fiber, and a bulky nonwoven fabric can be obtained by applying hot air after forming the nonwoven fabric from such a composite fiber. In addition, as a hydrophilic processing method of a fiber and a composite fiber, the method of processing by apply | coating a hydrophilic agent to a fiber and a composite fiber, or spray-applying and impregnating the manufactured 2nd sheet | seat 15 is mentioned.

The basis weight of the non-woven fabric constituting the second sheet 15 is preferably 15 g / m ² or more and 50 g / m ² or less, and more preferably 20 g / m ² or more and 45 g / m ² or less. By setting the basis weight of the second sheet 15 within the above range, the bulkiness of the second sheet 15 can be sufficiently maintained, and the absorbent performance and reversibility of the absorbent article 1 can be further improved.

  The second sheet 15 preferably covers all or part of the upper surface of the absorbent body 20.

(Matched embossed pattern)
In the present invention, the second sheet 15 has a matched emboss pattern having a three-dimensional recess and projection. Here, the matched emboss pattern is disclosed in, for example, JP-T-2002-512660, and includes a convex roller having a large number of convex bodies and a concave roller having a large number of concave bodies complementary to the convex bodies. Thus, the non-woven fabric is sandwiched so that the convex body and the concave body mesh with each other, and heat is applied as necessary. The second sheet 15 used in the absorbent article 1 of the present invention has such a matched emboss pattern, so that the second sheet 15 is kept bulky, and the thickness of the second sheet 15 is preferably 0.3 mm or more. It becomes 1.0 mm or less, More preferably, it is 0.5 mm or more and 1.0 mm or less.

  Moreover, since the recessed part and the convex part are formed in the plane of the second sheet 15 by giving the matched emboss pattern to the second sheet 15, the air permeability in the planar direction of the second sheet 15 is maintained well. When the body fluid comes into contact with the second sheet 15, the second sheet 15 can easily hold the body fluid. Any of these effects will contribute to the improvement of the absorption performance and reversibility of the absorbent article 1.

  The pattern shape of the matched emboss pattern of the second sheet 15 is a circle or an ellipse; a regular polygon or a polygon such as a triangle, a quadrangle, a pentagon, a hexagon, a heptagon, an octagon, or the like; Preferably, they are parallel straight lines; or curves parallel to each other. In the case of a polygon, the vertical dimension may be longer than the horizontal dimension, and the horizontal dimension may be longer than the vertical dimension. May be. In a more preferred embodiment, the matched embossing pattern of the second sheet 15 in the absorbent article 1 of the present invention has a hexagonal or regular hexagonal concave portion and a hexagonal or regular hexagonal concave portion, as shown in FIG. The honeycomb pattern is preferably configured.

  The area ratio of the concave portions of the matched emboss pattern of the second sheet 15 is preferably 5% or more and 90% or less, and more preferably 15% or more and 80% or less. By setting the area ratio within the above range, the three-dimensional shape of the matched emboss pattern is sufficiently maintained, and the bulkiness of the second sheet 15 is favorably maintained.

  In the present invention, two sheets of the second sheet 15 made of one layer of nonwoven fabric may be used for the absorbent article 1. In this case, it is preferable to laminate the two second sheets 15 so that the convex portions and the concave portions of the opposing surfaces of the two second sheets 15 overlap each other. By using two second sheets, the absorbent performance of the absorbent article is improved, and the reversibility and the like are significantly improved.

[Three-dimensional gather]
A solid gather may be provided on the body contact side surface of the absorbent article 1. The three-dimensional gather forms a body fluid confinement space together with the top sheet 10 so as to prevent side leakage of the body fluid. It is preferable that the three-dimensional gather includes a three-dimensional gather sheet and a stretchable elastic member disposed along the free end of the three-dimensional gather sheet. As the elastic elastic member, a thread-like, string-like, or flat-shaped member made of natural rubber, synthetic rubber, polyurethane, or the like can be appropriately used.

<Method for producing absorbent article>
There is no restriction | limiting in particular as a manufacturing method of the absorbent article 1, A conventionally well-known method is employable. For example, if necessary, a liquid diffusable sheet and a three-dimensional gather are disposed on the top sheet 10 in advance, and the second sheet 15 and the absorbent body 20 are sandwiched between the top sheet 10 and the back sheet 30. And it can manufacture by fixing the top sheet 10 and the back sheet 30 using a hot-melt-adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc. partially or entirely. Finally, after individually packaging it in a package, it may be folded in three in the longitudinal direction.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range of the invention as described in said embodiment, A various change or improvement to said embodiment. It will be apparent to those skilled in the art that Further, it is apparent from the scope of the claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

<Example 1>
An absorbent mat in which 15 g of fluff pulp pulverized by pulp pulp and 7 g of superabsorbent polymer was piled together was prepared and cut into a length of 270 mm and a width of 90 mm. The absorbent body is laminated together with a top sheet, a second sheet, and a back sheet, and a pair of three-dimensional gathers for preventing side leakage are formed to produce a light incontinence pad having a length of 300 mm and a width of 120 m. It was. As the top sheet, an air-through non-woven fabric (basis weight 20 g / m ² ) is used on the body side, and as the back sheet, a polyethylene film (basis weight 40 g / m ² ) is used, and the second sheet has a longitudinal direction. An air-through nonwoven fabric (basis weight 30 g / m ² , thickness 0.6 mm) having a matched emboss pattern having a honeycomb pattern three-dimensional recess and projection having a dimension of 270 mm and a width dimension of 60 mm is used. The entire surface was covered. The area ratio of matched embossing was 15%. About the obtained absorbent article, the absorption rate and the liquid return amount were examined.

(Absorption rate)
A hole with an inner diameter of 75 mm is opened in the center of a cylinder with an outer diameter of 80 mm, and a measuring jig having a weight of 100 g is placed in the longitudinal direction and the width direction of the urine collection pad with the top sheet facing upward. Place it on the top, drop 150 ml of physiological saline from the upper hole, and finish when the physiological saline is completely sucked into the circumference in the center circle of the measuring jig after the physiological saline contacts the urine collection pad. The time was measured as the absorption rate.

(Liquid return amount)
170 ml of physiological saline was injected into the center of the absorbent article, and after 50 seconds, a filter paper (ADVANTEC No. 2 filter paper, diameter 55 mm), which had been weighed in advance, was placed in the center of the injection part and placed on the filter paper. A 687 g weight was placed (pressure: 35 gf / cm 2). One minute after placing the weight, the weight of the filter paper was measured, and the weight difference (g) of the filter paper before and after the test was defined as the liquid return amount. The liquid return amount was an average value of N = 10 samples. The smaller the liquid return amount, the better the absorption performance.

(Sheet thickness measurement method)
The thickness of the sheet was measured under a load condition of 35 gf / cm ² using a height gauge (manufactured by Mitutoyo Corporation).

<Examples 2 and 3>
An absorbent article was prepared in the same manner as in Example 1 except that the basis weight and thickness of the second sheet were changed as shown in Table 1.

<Comparative Example 1>
An absorbent article was prepared in the same manner as in Example 1 except that the matched emboss pattern was not given to the second sheet. The number, basis weight, and thickness of the second sheet used in the absorbent article of Comparative Example 1 were as shown in Table 1.

The results of the water absorption rate and the liquid return amount of the examples and comparative examples are as shown in Table 1.

DESCRIPTION OF SYMBOLS 1 Absorbent article 10 Top sheet 15 Second sheet 20 Absorber 30 Back sheet

Claims (7)

In an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet,
A second sheet is arranged between the top sheet and the absorber,
The top sheet does not have an embossed pattern,
The second sheet is made of a single layer of nonwoven fabric,
The absorptive article in which the second sheet has a matched emboss pattern having a three-dimensional recess and projection. The absorbent article according to claim 1, wherein the basis weight of the second sheet is 15 g / m ² or more and 50 g / m ² or less, and the thickness of the second sheet is 0.3 mm or more and 1.0 mm or less.   The absorbent article according to claim 1 or 2, wherein the matched emboss pattern of the second sheet is a honeycomb pattern.   The absorbent article in any one of Claim 1 to 3 whose area ratio of the recessed part of the matched embossing pattern which the said 2nd sheet has is 5% or more and 90% or less.   The absorbent article according to any one of claims 1 to 3, wherein two second sheets made of one layer of non-woven fabric are used and laminated so that convex portions or concave portions of opposing surfaces overlap each other in the two second sheets. .   The nonwoven fabric sheet used for the second sheet is an air-through nonwoven fabric composed of composite fibers composed of polyethylene and polypropylene, or an air-through nonwoven fabric composed of composite fibers composed of polyethylene and polyester. The absorbent article as described. The absorbent article according to any one of claims 1 to 6, wherein the second sheet covers all or part of the upper surface of the absorbent body.

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