WO2018003586A1

WO2018003586A1 - Absorbent article and production method therefor

Info

Publication number: WO2018003586A1
Application number: PCT/JP2017/022590
Authority: WO
Inventors: 崇博島田; 大介古川
Original assignee: 株式会社瑞光
Priority date: 2016-06-30
Filing date: 2017-06-19
Publication date: 2018-01-04
Also published as: JP6731050B2; JPWO2018003586A1; CN109310550A

Abstract

Provided are: an absorbent article that enables improvement of absorption properties while ensuring favorable feel to the skin and re-wettability; and a production method therefor. The present invention is provided with: a first sheet (12) and a second sheet that are disposed so as to face each other; and an absorbent body (16) that is interposed between the first sheet (12) and the second sheet. The first sheet (12) is formed of a single liquid-permeable sheet and includes: a protruded region (12a) formed of a plurality of protrusions protruding toward the side opposite to the second sheet; and flat regions (12s, 12t) which are encircled by the protruded region (12a). The absorbent body (16) is disposed so as to face the flat regions (12s, 12t) and the protruded region (12a) of the first sheet (12). The flat regions (12s, 12t) of the first sheet (12) and the absorbent body (16) are bonded to each other.

Description

Absorbent article and manufacturing method thereof

The present invention relates to an absorbent article and a method for manufacturing the same, and more particularly to an absorbent article having a convex portion formed on the surface and a method for manufacturing the same.

For example, as shown in the perspective view of FIG. 5, it has been proposed to use a nonwoven fabric 1 having a large number of convex portions 5 as a top sheet of an absorbent article (see, for example, Patent Document 1).

JP 2009-155741 A

For example, a disposable diaper uses an absorbent article in which a liquid-retaining absorbent is disposed between a liquid-permeable top sheet and a liquid-impermeable back sheet. When the nonwoven fabric in which the convex part was formed is used as a surface sheet of an absorbent article, the convex part becomes a cushion with respect to skin, the touch is good and the effect that it is excellent in rewet property is acquired.

However, since the inside of the convex portion is hollow, there is a problem that when urine or the like flows from the skin side, it is difficult to be absorbed by the absorber side.

In view of such circumstances, the present invention is intended to provide an absorbent article that can improve the absorbency while ensuring the feel and rewet, and a method for producing the same.

The present invention provides an absorbent article configured as follows in order to solve the above-described problems.

The absorbent article includes (a) first and second sheets facing each other, and (b) an absorbent body disposed between the first sheet and the second sheet. The first sheet is composed of only one liquid-permeable sheet, and is surrounded by a convex region in which a plurality of convex portions projecting on the side opposite to the second sheet is formed, and the convex region. And a flat region. The absorber is opposed to the convex region of the first sheet and the flat region of the first sheet.

According to the above configuration, since the flat region of the first sheet is flat, the contact area with the absorber is increased and the absorbability is improved as compared with the convex region of the first sheet. By the convex region of the first sheet, it is possible to ensure touch and rewet. Therefore, the absorbability can be improved while ensuring the touch and rewetting.

Preferably, the flat area of the first sheet and the absorber are bonded to each other.

In this case, the state where the flat region of the first sheet and the absorber are in contact with each other is maintained, and the absorbability is stabilized.

Preferably, in the first sheet, a slit or a through hole penetrating between the main surfaces of the first sheet is formed in the flat region.

In this case, the liquid on the first sheet side is absorbed by the absorber through the slits or through holes formed in the flat region of the first sheet, thereby further improving the absorbability.

Moreover, in order to solve the above-mentioned problems, the present invention provides a method for manufacturing an absorbent article configured as follows.

The manufacturing method of an absorbent article includes (i) a convex region formed of only one liquid-permeable sheet, on the other hand, formed with a plurality of convex portions projecting to the main surface side, and surrounded by the convex region. And (ii) an absorber is disposed on the other main surface side of the first sheet, and the flat region and the convex portion of the first sheet. Adhering the absorbent body and the flat region of the first sheet to each other in a state of facing the region; and (iii) a second sheet overlapping the other main surface of the first sheet. And adhering the first sheet and the second sheet to each other around the absorber in a state of covering the absorber.

According to the above method, it is possible to manufacture an absorbent article that can improve the absorbency while ensuring the touch and the rewet.

Preferably, in the first sheet, a slit or a through hole penetrating between the one main surface and the other main surface of the first sheet is formed in the flat region in advance.

In this case, an absorbent article with further improved absorbability can be manufactured.

According to the present invention, the absorbency can be improved by the flat region of the first sheet while ensuring the touch and the rewet property by the convex region of the first sheet.

FIG. 1 is a plan view of the absorbent article. Example 1 FIG. 2 is a cross-sectional view taken along line AA in FIG. Example 1 3 is a cross-sectional view taken along line BB in FIG. Example 1 FIG. 4 is an enlarged plan view of a main part of part C in FIG. (Modifications 1 and 2) FIG. 5 is a perspective view of the nonwoven fabric. (Conventional example 1)

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Example 1> The absorbent article 10 of Example 1 will be described with reference to FIGS. FIG. 1 is a plan view of the absorbent article 10. FIG. 2 is an exploded cross-sectional view schematically showing a cross section cut along line AA in FIG. FIG. 3 is an exploded cross-sectional view schematically showing a cross section taken along line BB in FIG.

As shown in FIGS. 1 to 3, in the absorbent article 10, a liquid-retaining absorbent 16 is disposed between a rectangular top sheet 12 and a back sheet 14 facing each other. The top sheet 12 is the first sheet of the present invention. The back sheet 14 is the second sheet of the present invention.

The top sheet 12 is composed of only one liquid permeable sheet. A non-woven fabric can be used for the top sheet 12. The backsheet 14 includes one or more sheets, and preferably includes at least one liquid-impermeable sheet. The top sheet 12 and the back sheet 14 are bonded to each other through

adhesive layers

18a, 18b, 18m, and 18n formed along the outer peripheral edges of the top sheet 12 and the back sheet 14, respectively. The

adhesive layers

18a, 18b, 18m, and 18n surround the absorber 16.

The

adhesive layers

18a, 18b, 18m, and 18n may be formed over the entire range indicated by the hatched area in FIG. 1 or may be partially formed. The

adhesive layers

18a, 18b, 18m, and 18n are formed by an adhesive, heat seal, ultrasonic seal, or the like.

In the absorbent body 16, for example, a core 16x including a superabsorbent polymer (abbreviated as SAP) is surrounded by a tissue 16a via an adhesive layer 16b. The core 16x is formed in an appropriate shape according to the application. The adhesive layer 16b is partially formed between the core 16x and the tissue 16a, and maintains the state where the core 16x and the tissue 16a are in contact with each other. The absorber 16 may have a configuration other than the illustrated configuration.

The top sheet 12 includes (a) a convex region 12a extending in the longitudinal direction of the absorbent article 10 at the center of the top sheet 12, (b) an outer peripheral region 12b outside the convex region 12a, and (c). A pair of

flat regions

12 s and 12 t that are surrounded by the convex region 12 a and extend in the longitudinal direction of the absorbent article 10. In FIG. 1, the convex region 12a is a region between

chain lines

12p and 12q.

As shown in FIG. 2 and FIG. 3, the convex region 12a is formed with a plurality of convex portions 12x projecting on the opposite side to the back sheet 14 and hollow inside. The

flat regions

12s and 12t are flat portions where the convex portions 12x are not formed.

In addition, the shape of the

flat regions

12s and 12t is not particularly limited. For example, it may have a curved shape, a zigzag shape, or a shape other than a linear shape. The arrangement of the

flat regions

12s and 12t is not particularly limited, and the

flat regions

12s and 12t may be arranged parallel to each other as shown in FIG. The number of the

flat regions

12s and 12t may be only one or three or more. The convex region 12a may be configured to continuously surround the

flat regions

12s and 12t, or the convex region may intermittently surround the flat region.

For example, the protrusion 12x is configured such that the sheet passes between a first roll having a plurality of protrusions and a second roll having a plurality of depressions corresponding to the protrusions, and the protrusions of the first roll and the second meshing with each other. The sheet can be formed by sandwiching the sheet with the recess of the roll. If projections and depressions are not provided at appropriate portions of the first roll and the second roll,

flat regions

12s and 12t surrounded by the convex region 12a can be formed. In this case, the

flat regions

12s and 12t have a width larger than the interval between the adjacent convex portions 12x in the convex region 12a, and are equal to or larger than one convex portion 12x of the convex region 12a. It will be. The

flat regions

12s and 12t are preferably equal in size or larger than the two adjacent convex portions 12x of the convex region 12a, more preferably, the three convex portions 12x adjacent to each other in the convex region 12a. Make it equal or larger.

Although the case where the convex portion 12x is not formed in the outer peripheral region 12b is illustrated, even if the convex portion 12x is formed in a part or all of the outer peripheral region 12b, or the convex portion 12x once formed is crushed. It does not matter.

The absorber 16 is opposed to the

flat regions

12s and 12t of the top sheet 12 and the convex region 12a. The

flat regions

12s and 12t of the top sheet 12 and the tissue 16a of the absorber 16 are bonded to each other in a form that allows liquid to pass therethrough. For example, the adhesive layer may be formed by a method of applying an adhesive in a spiral shape, a spiral shape, or a dotted shape within the range of the

adhesive layers

18 s and 18 t that are hatched in FIG. 1 or a method of spraying the adhesive. The adhesive is applied and bonded only to a part within the range of 18s and 18t. The range of the

adhesive layers

18s and 18t coincides with the

flat regions

12s and 12t of the top sheet 12 only when the main surface of the top sheet 12 is viewed vertically, even inside the

flat regions

12s and 12t of the top sheet 12. Alternatively, the top sheet 12 may protrude outside the

flat regions

12s and 12t.

Since the

flat regions

12s and 12t of the top sheet 12 are flat, the contact area with the absorbent body 16 is increased and the absorbability is improved as compared with the convex region 12a of the top sheet 12. For example, when the liquid that has not been absorbed by the absorber 16 through the convex region 12 a of the top sheet 12 reaches the

flat regions

12 s and 12 t of the top sheet 12, it is absorbed by the absorber 16.

The state where the

flat regions

12s and 12t of the top sheet 12 and the absorber 16 are in contact with each other is held by the

adhesive layers

18s and 18t, so that the absorbability is stabilized. Since the

flat regions

12s and 12t of the top sheet 12 are flat, it is easy to bond the

flat regions

12s and 12t of the top sheet 12 and the absorber 16 to each other.

On the other hand, the convexity 12x of the convexity region 12a of the top sheet 12 can ensure the touch and rewet.

Therefore, by appropriately configuring the convex region 12a and the

flat regions

12s and 12t of the top sheet 12, the absorbability can be improved while ensuring the touch and rewet.

The absorbent article 10 can also be used for disposable diapers, sanitary napkins, urine leak pads, and the like.

When using the absorbent article 10 as an absorbent main body of a disposable diaper, the top sheet 12 of the absorbent article 10 is in contact with the skin or disposed on the skin side. When the absorbent article 10 is used for a boy's disposable diaper, the

flat regions

12s and 12t of the top sheet 12 may be formed closer to the front side of the absorbent body 16, that is, on the ventral side than the longitudinal center of the absorbent body 16. preferable. When the absorbent article 10 is used for a disposable diaper for girls, the

flat regions

12s and 12t of the top sheet 12 are preferably formed at the center in the front-rear direction of the absorbent body 16, that is, at the center in the longitudinal direction of the absorbent body 16. If the top sheet 12 is provided with a plurality of

flat regions

12s, 12t, the absorbency is maintained even when the wearing position is shifted, and the absorbency is good.

Next, an example of a method for manufacturing the absorbent article 10 will be described.

First, (a) a length that includes only one liquid-permeable sheet, and includes a convex region in which a plurality of convex portions projecting toward the main surface is formed, and a flat region surrounded by the convex region. A scale-shaped first sheet, (b) a long-sized second sheet, and (c) a plurality of absorbers are prepared. The first sheet becomes the top sheet 12 and the second sheet becomes the back sheet 14.

Next, the elongated first sheet is conveyed in the longitudinal direction, an adhesive is applied to the flat region of the other main surface of the first sheet, and an absorber is disposed thereon, whereby the absorber is The absorber and the flat region of the first sheet are bonded to each other in a state of being disposed on the other main surface side of the first sheet and facing the flat region and the convex region of the first sheet.

Next, after applying an adhesive to a predetermined position of the second sheet, the long second sheet is overlapped with the other main surface of the long first sheet, whereby the long second sheet becomes the long first sheet. The first sheet and the second sheet are bonded to each other around the absorbent body in a state of overlapping the other main surface of the sheet and covering the absorbent body. The first sheet and the second sheet may be bonded to each other by heat sealing or ultrasonic sealing.

Next, the long first sheet and the second sheet are cut at appropriate places around the absorbent body, and individual pieces of the absorbent article are taken out.

The absorbent article 10 can be continuously manufactured through the above steps.

The absorbent article 10 can also be manufactured by disposing an absorbent body on the second sheet and stacking the first sheet thereon. In this case, adhesion between the absorber and the flat region of the first sheet and adhesion between the first sheet and the second sheet can be performed simultaneously.

<Modification 1> FIG. 4A is an enlarged plan view of a main part of the C part in FIG. As illustrated in FIG. 4A, slits 13 a, 13 b, and 13 c that penetrate between the main surfaces of the top sheet 12 may be formed in the

flat regions

12 s and 12 t of the top sheet 12.

The

slits

13a, 13b, and 13c each extend in the short direction of the absorbent article 10 and have substantially the same length. The slit 13a and the slit 13b face each other in the short direction of the absorbent article 10. The slits 13 a and slits 13 b and the slits 13 c are alternately formed at a predetermined pitch in the longitudinal direction of the absorbent article 10. The slit 13c faces the gap between the slit 13a and the slit 13b facing each other. Note that slits different from the configuration shown in FIG. 4A may be formed in the

flat regions

12 s and 12 t of the top sheet 12.

When the

slits

13a, 13b, and 13c are formed in the top sheet 12, the liquid on the top sheet 12 side is absorbed by the absorber 16 through the

slits

13a, 13b, and 13c, thereby further improving the absorbability.

<Modification 2> FIG. 4B is an enlarged plan view of a main part of the C part in FIG. As shown in FIG. 4B, a plurality of through holes 13 p that penetrate between the main surfaces of the top sheet 12 may be formed in the

flat regions

12 s and 12 t of the top sheet 12. The cross-sectional shape, dimensions, number, and arrangement of the through holes 13p can be appropriately selected.

When the through-hole 13p is formed in the top sheet 12, the liquid on the top sheet 12 side is absorbed by the absorber 16 through the through-hole 13p, so that the absorbability is further improved.

<Summary> As described above, the

flat regions

12s and 12t of the top sheet 12 can improve the absorbency while securing the touch and the rewet property by the convex region 12a of the top sheet 12.

It should be noted that the present invention is not limited to the above embodiment, and can be implemented with various modifications.

10 Absorbent article 12 Top sheet (first sheet)
12a convex part area 12b outer

peripheral area

12s, 12t flat area 12x

convex parts

13a, 13b, 13c slit 13p through hole 14 back sheet (second sheet)
16 Absorber 16a Tissue 16b Adhesive

layer 16x Core

18a, 18b, 18m, 18n, 18s, 18t Adhesive layer

Claims

First and second sheets facing each other;
An absorber disposed between the first sheet and the second sheet;
With
The first sheet is
It consists of only one liquid-permeable sheet,
A convex region in which a plurality of convex portions projecting to the opposite side of the second sheet are formed;
A flat region surrounded by the convex region,
Including
The absorber is
The convex region of the first sheet;
The flat area of the first sheet;
An absorbent article, characterized by facing the
The absorbent article according to claim 1, wherein the flat region of the first sheet and the absorbent body are bonded to each other.
The absorbent article according to claim 1 or 2, wherein the first sheet is formed with a slit or a through-hole penetrating between the main surfaces of the first sheet in the flat region. .
A first sheet comprising only one liquid-permeable sheet, and including a convex region formed with a plurality of convex portions projecting toward the main surface side and a flat region surrounded by the convex region. A preparation process;
The absorber is disposed on the other main surface side of the first sheet, and in the state facing the flat region and the convex region of the first sheet, the absorber and the first sheet Bonding the flat regions to each other;
A second sheet is bonded to the first sheet and the second sheet around the absorber in a state where the second sheet overlaps the other main surface of the first sheet and covers the absorber. Process,
A method for producing an absorbent article, comprising:
The first sheet is characterized in that a slit or a through hole penetrating between the one main surface and the other main surface of the first sheet is formed in the flat region in advance. Item 5. A method for producing an absorbent article according to Item 4.