JPH03224559A - Disposable wearing article - Google Patents

Abstract

PURPOSE:To decrease gathers in the periphery of the waist by using a top and a back sheet made of nonwoven fabric in which an elastically stretching stress in the horizontal direction is smaller than that in the vertical direction and setting the horizontal direction of each sheet as the horizontal direction of a wearing article. CONSTITUTION:As for nonwoven cloth, that which is obtained by forming a web by carding of heat crimped fiber of 20-50g/m<2> METSUKE and 0.5-3d fineness, forming it to wafer flow twining nonwoven fabric, and thereafter, executing a heat treatment thereto is used. In this case, the elastic flexibility is made different in the advance direction (MD direction) of the web and the direction (CD direction) vertical thereto, so that it stretches easily in the CD direction. In such a state, an article 1 is constituted of a top and a back sheet in which this CD direction becomes the horizontal direction. In such a way, the article elastically stretchs easily in the horizontal width direction, and the number of gathers provided in the periphery of the waist can be made much smaller than that of a conventional wearing article.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to disposable wearing articles, and more particularly to open-type diapers, pants, brief-type diapers (including incontinence diapers), and so-called training pants. Regarding disposable wearing articles.

(Prior Art and its Problems) Conventionally, in this type of disposable wearing article, such as pants or briefs type articles, especially training pants, elastic members are attached to the waist circumference and the leg circumference,
It is known that an absorbent core is interposed between a top sheet and a back sheet.

However, in such articles, the top and back sheets do not have elasticity, and even if they do, they cannot be said to be excellent, and as a result, elastic members are used in combination to surround the waist and legs. The presence of a large number of gears is one of the factors that impairs the fit and feeling of wearing, and the bulk of the gears This has also become a hindrance when trying to store and store said articles in a compact form. That is, it has been a long-standing problem how to reduce the amount of gearing, improve fit and wearability, and achieve compact storage without impairing the workability of putting on and taking off.

(Means for Solving Problem 11) The article of the present invention has the most preferable configuration, using a top and back sheet made of a nonwoven fabric having elasticity in which the elastic stress in the horizontal direction is smaller than that in the longitudinal direction, The lateral direction of each sheet is the lateral direction of the wearing article. More preferably, the elastic stretching stress in the lateral direction is configured such that the nonwoven fabric has a basis weight of 20 to 50 g/rrl' and is 30 g/25 mm width or less when stretched by 50%.

(Function) In the article of the present invention having the above configuration, the top sheet and the back sheet themselves expand and contract well in the lateral direction of the article, that is, around the waist, so it is possible to reduce the gathers especially around the waist, and This makes it possible to improve the feeling of wearing and realize storage in a compact form.

However, in such an article of the present invention, elastic members attached by a conventionally known method are also used around the waist and around the legs to stabilize the state of wearing the article on the body.

(Example) An example of the wearing article of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a wearing article 1 includes a leg surround 2,
It has a waist circumference 3, and elastic members 4 and 5 are attached to each of them.

As shown in FIG. 2, the article 1 includes an elastically stretchable top sheet 6 made of a nonwoven fabric, an elastically stretchable backsheet 7 made of the same nonwoven fabric, and a mat or sheet-like water absorbent core 8. The leg and waist elastic members 4
. Cut edges 13, 14, 15 for encircling the legs are formed on both side edges of the crotch area 12 located between the top and back sheets 6.7 and the front and rear areas 10.11 of the barrier sheet 9. A barrier sheet 9 is bonded to the entire area of the back sheet 7 using hot melt adhesive or fusion, and
A core 8 is intermittently bonded to the upper surface of the barrier sheet 9 using a hot-melt adhesive or fusion. The connections between the core 8 and the barrier sheet 9 and between the top sheet 6 and the barrier sheet 9 are made by a number of dot-shaped joining means 16, which may be a number of interrupted lines of suitable length. . As shown in FIG.
7 (see FIG. 6), which may also be a number of interrupted lines of suitable length.

A group of fine ventilation holes 18 are provided on both sides of the barrier sheet 9 in the front and rear regions 10.11 (see FIG. 3).

Concave edges of top sheet 6 and barrier sheet 9 13.
15 and the ends 19 of the front and rear sections 10 and 11 are arranged with leg and waist elastic members 4 and 5.

The leg elastic member 4 is composed of a first member 4A and a second member 4B. The first and second members are.

The parts 4A and 4B1 that intersect near their both ends and extend from this intersection to the outer end are connected to the top sheet 6 and/or
Alternatively, the inner surface of the barrier sheet 9 is bonded along the notch edges 13.15 with a hot melt adhesive, and the central portions 4A, 4B are located on the lower surface of the central region of the core without bonding to any member. It's important. However, the central portions 4A, 4B.

The waist elastic member 5 is adhered to the inner surface of the topsheet and/or barrier sheet 9 along the edge 19 with a hot melt adhesive.

The outer peripheries of the top sheet 6 and barrier sheet 9 may be bonded by heat sealing or hot melt adhesive as necessary, and the upper surface of the core 8 may also be bonded intermittently to the top sheet 6 as necessary. As shown by the chain lines in FIG.
In this case, the elastic member is preferably bonded to the backsheet 7.

As shown in FIG. 5, the barrier sheet 9 is formed to have a width corresponding to that of the barrier sheet 9 shown in FIG. 3, with the portion outside the chain line 20 removed.

In such a case, ventilation is provided on both sides of the top and back sheets where the barrier sheet 9 is not located.

The thus constructed laminate 21 is folded in two in the longitudinal direction at the center and joined at both side edges by heat sealing means 22 to form the component 1 shown in FIG.

However, in the present invention, the heat-sealing means 22 may be omitted and the article may be of a known open type. In this case, a known tape fastener or the like is attached to both sides of the rear region 11 (see FIG. 2). A fastening means is provided. Further, depending on the article, the core 8 may not be arranged.

The top and backsheets 6.7 are made of non-woven fabrics and can be the same, but each has different elasticity in the lateral and longitudinal directions of the article 1, with the elastic stress in the lateral direction being higher than that in the longitudinal direction. It is also small, preferably 30 g/25 mm width or less at 50% stretching when the nonwoven fabric has a basis weight of 20 to 50 g/rd. Elastic stretchability referred to here means that when tension is repeatedly applied to a piece of nonwoven fabric of an appropriate length with a width of 25+ wa, it can repeat elastic expansion and contraction, and such expansion and contraction occurs several times. Repetition may result in elongation as permanent deformation of, for example, about 5 to 20%. Further, the term "expansion stress" means a load as a tension applied to a 25 nn width specimen.

Furthermore, the non-woven fabric that is the material for the top and back sheets 6.7 is manufactured using a well-known method with a fabric weight of 20.
~50 g/rd, heat-crimped fibers with a fineness of 0.5 to 3 d are carded to form a web, which is then hydroentangled under a jet fountain to form a nonwoven fabric, which is then heat treated to give it a sheet state. be able to. A nonwoven fabric containing heat-crimped fibers produced by such a process is produced in a direction in which the web travels in the manufacturing process (MD force direction) and a direction perpendicular thereto (CD direction).
The elasticity and stretchability are markedly different between
As a result, the stretching stress at the time of 50% stretching described above is reduced to CD
A nonwoven fabric having a width of 30 g/25+m or less in the direction can be easily obtained. At this time, the stretching stress in the MD direction is usually 10
00 g/25mm width or more. The article 1 is composed of, for example, a top sheet and a back sheet with the CD direction being the horizontal direction. As the heat-crimped fiber, for example, one of the preferable ones is "rEP fiber" commercially available from Chisso Corporation. By using such a top and back sheet 6.7, the article 1 becomes elastically expandable and contractable, especially in the width direction. Therefore, when attaching the waist elastic member 5, the number of gears provided around the waist can be adjusted. It can be much less worn than conventional wearable articles.

In addition, the basis weight of the nonwoven fabric of the top and back sheets is 2.
If it is less than 0 g/rrr, the strength is insufficient as a hydroentangled nonwoven fabric, and if the basis weight exceeds 50 g/rd, it will result in excessive quality and is economically unfavorable.

Further, if the elastic stretching stress exceeds 30 g/25 m width, the elasticity around the waist is too strong when the article 1 is worn, which tends to impair the feeling of wearing, which is not preferable.

The core 8 is made of a molded mixture of fluff pulp, water-absorbing polymer particles, and heat-fusible fibers, and the barrier sheet 9 is made of a molded mixture of fluff pulp, water-absorbing polymer particles, and heat-fusible fibers;
It is used as needed to prevent leakage.
Thickness 0.005-0.080a.

low-density polyethylene film is used.

In selecting the material, the barrier sheet 9 should be easily stretched in both the horizontal and vertical directions in the completed article 1, and the top and back sheets 6.
The elastic members 4 and 5, which are designed so as not to inhibit the development of elasticity in the horizontal and vertical directions of the elastic members 7, can each be made of a single string, a band-like rubber, or a plastic.

(Effects of the Invention) According to the article of the present invention, the top and back sheets made of nonwoven fabric having elastic stretchability are those having a small elastic stretching stress in the lateral direction, that is, those that are particularly easy to elastically stretch in the lateral direction of the article. Since it is a disposable item, it is possible to provide a wearing article with reduced gathers around the waist compared to conventional disposable wearing articles, and the article thus provided has excellent fit around the waist and comfort when worn. It is easy to store and store in a compact form.

[Brief explanation of drawings]

The drawings show an embodiment of the article of the present invention, and FIG. 1 is a perspective view, FIG. 2 is an exploded perspective view, FIG. 3 is a perspective view of a barrier sheet, and FIG. FIG. 5 is a perspective view showing an example of arrangement of elastic members, FIG. 5 is a perspective view of a narrow barrier sheet, and FIG. 6 is a cross-sectional view of the back sheet and barrier sheet joined together. 1... Article 4... Thick elastic member 5... Waist elastic member 6... Top sheet 7... Back sheet diagram

Claims (2)

[Claims] (1) A disposable wearing article consisting of a top sheet made of an elastically stretchable nonwoven fabric, a backsheet made of an elastically stretchable nonwoven fabric, and leg and waist elastic members arranged on both sides of the crotch area and on both ends of the front and back areas, respectively. . The wearing article, wherein the top sheet and the back sheet each have different elastic stretchability in the lateral direction and the longitudinal direction, and the elastic stretch stress in the lateral direction is smaller than that in the longitudinal direction. (2) The elastic stretching stress in the lateral direction is 30 when stretched by 50% when the nonwoven fabric has a basis weight of 20 to 50 g/m^2.
The wearing article according to claim 1, which has a width of less than g/25 mm.