JPH03104901A - Production of throwaway wearing article - Google Patents

Abstract

PURPOSE:To obtain the title article having correct shape by introducing and attaching elastic members around legs and west in an outside web and folding inner web and core back. CONSTITUTION:Elastic member 4 around legs and elastic member 5 around west are attached in outside webs 16a and 16b and inside web 10 and core 11 are folded back and both side edge 8 of front and back bodies is heat-sealed with edge 9 under the crotch. By the above-mentioned method, the aimed article is free from defects in which part of each article 1 is loosen or crease is formed or both sides are heat-sealed in a state where either one of edge around west of front and back bodies is projected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing disposable wearing articles such as so-called training pants for infants, incontinence pants, and sanitary pants for women.

[Prior art and its problems] Conventionally, leg and waist elastic members are attached to at least one of each continuous inner and outer web, and absorbent cores are interposed intermittently in the longitudinal direction of the inner and outer webs. Manufacturing methods are known in which individual articles are formed by constructing a continuous laminate and cutting the laminate at predetermined locations.

For example, as an example, JP-A-57-77304
No. 57-117602.

In the manufacturing process of this type of article including the above-mentioned known technology, in order to define the front and back bodies of each article in a continuous laminate to which leg and waist elastic members are attached, the laminate is folded in two. It is necessary to heat-seal the lateral edges of each article when worn.

However, in the above-mentioned known technology, the elastic members around the legs and waist that are about to contract are connected and! Since the laminate is folded in two, this folding is done under the tension of the laminate, but it is not completely folded into two, in other words, parts of the individual articles may be lifted or wrinkled. Otherwise, the heat sealing may be performed with one of the waist edges of the front and back bodies that are supposed to match protruding, resulting in an article that does not have a proper shape. It is an object of the present invention to eliminate the above-mentioned drawbacks by introducing and attaching elastic members around the legs and waist to the outer web, while folding the inner member consisting of the inner web and the core in two. An object of the present invention is to provide a method for manufacturing a disposable wearing article.

[Method for Solving the Problems] In order to achieve the above object, the method of the present invention first arranges absorbent cores at given intervals in the length direction of a continuous inner web, and absorbs absorbent cores between each of the cores. The inner web is cut widthwise to form individual inner members, and each inner member is cut so that the core is located on the outer surface (both lengthwise ends of the inner web are substantially colinear). Fold them one after another and align them in contact or close together.

Next, leg and waist elastic members are attached within required surface walls of the inner surfaces of the two continuous outer webs, and these outer webs are stacked on both sides of the row of inner members to form a continuous laminate, and the laminate is After heat sealing a given section of the product, the given section is cut away to form individual articles.

As can be understood from the foregoing, according to the manufacturing method of the present invention, the leg and waist elastic members are introduced and attached to the continuous outer web, while the inner web cut to a predetermined length and overlapped therewith. The main feature is that the inner member, which is made of a solid core, is folded in two.

In a preferred embodiment, the core is molded.

[Operations and Effects] According to the method of the present invention, while the leg and waist elastic members are introduced and attached to the outer web, the inner member consisting of the inner web and the core is folded in half, so that the inner The member is not subjected to shrinkage stress of the elastic member. However, some parts of individual items may come out,
It is possible to hang an article having a neat form without the drawbacks of wrinkles or the fact that both side edges are heat-sealed with one of the waist edges of the front and back bodies to be matched protruding.

Furthermore, since the core is molded, it will not lose its shape during the folding process.

[Example] An example of the method of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a wearing article 1 manufactured by the method of the present invention.

The article 1 has a leg part 2 and an IW part 3, each having elastic members 4 and 5 attached thereto, and constructed by heat-sealing both side edges 8 of the front and rear body parts 6 and 7 and the crotch edge 9. It has been done. As will be described later, the front and rear body parts 6, 7 include inner and outer wafers and an absorbent core interposed between the two wafers, and the elastic member 4.5 is stretchable between the two wafers via an adhesive. It is attached to.

FIG. 2 is a perspective view schematically showing the process of carrying out the method of the present invention.

Continuous inner web IO of given width made of stretchable non-woven fabric
While moving the inner web to an assembly process (not shown), absorbent cores 11 which are narrower than the width of the inner web and pre-formed in an hourglass shape are placed on the central part of the upper surface of the inner web at given intervals in the length direction. Hot melt adhesive (not shown)
Fixedly placed. The core 11 is made by mixing fluff pulp, thermoplastic crimped staple fibers, and superabsorbent polymer particles almost uniformly, heat-treating this mixture to fuse the stable fibers together, and dispersing an appropriate amount of moisture. The web is suitably compressed in the thickness direction to form a continuous web, and the web is cut into a sheet or mat shape, which has an hourglass shape, that is, a shape with concave notches L2 on both sides of the center and a narrow center part, It doesn't lose its shape easily. The inner member l3 is formed by sequentially cutting the continuous inner web 10 in the width direction between the opposing cores 11. Each inner member 13 formed in this way is attached to the half or upper surface of the core 1l (
the first outer surface) and the other half thereof are located on the lower surface (second outer surface), and the longitudinal ends 14 of the inner web are located on the same line. Fold over. Each inner member l3 folded in this way is folded into one folded end (center line in @ direction) 1
5 and the other end l4 of the member are sequentially brought into contact with or closely aligned and moved to the assembly process.

On the other hand, two continuous outer webs 16a, which have the same width as the continuous inner web 10, are made of a longitudinally and laterally stretchable nonwoven fabric, or a laminate sheet in which a longitudinally and laterally elastic plastic film is intermittently bonded to the inner surface of the nonwoven fabric, or the film alone. ，
16b is moved to the assembly process. Outer web 1
6a, 16b, and on both sides of a given surface area l7 corresponding to the respective widths of the upper and lower surfaces of each inner member 13, the leg elastic members 4 are stretched in advance into an arc shape and hot melted. Attach sequentially symmetrically on both sides with mold adhesive (not shown). The curved shape of the leg elastic member 4 is a concave notch I of the core 11.
It is preferable that the length be substantially along half of the length of 2. Furthermore, a waist elastic member 5 is pre-stretched in the width direction within the given surface area 17 of the outer webs 16a, 16b and between the leg elastic members 4 opposing in the length direction of the outer webs 16a, 16b. are sequentially attached in a straight line with hot melt adhesive (not shown).

External webs 16a are provided on the upper and lower surfaces of each of the arranged inner members l3.
, 16b are stacked on top and bottom of these so that the surface areas 17 coincide with each other to form a continuous laminate l8.

The laminate l8 is placed between both side edges along its length, the width direction folded end l5 of each inner member l3, and the waist elastic member 5 (
Then heat seal 8.9 is applied to each in turn.

Finally, the laminate I8 is sequentially cut in the width direction between the waist elastic member 5 and the width direction heat seal 9, and the outer portion 9 along the curve of the leg elastic member 4 is sequentially cut out. This allows individual articles l (see Figure 1)
form.

Although the present invention does not exemplify an apparatus for carrying out this process, it can be carried out using any known apparatus.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an article manufactured by the method of the present invention, and FIG. 2 is a perspective view schematically showing the steps of the method of the present invention. 1: Article 4: Leg elastic member 5: Waist elastic member 8, 9: Heat seal 10: Continuous inner web 11: Core l3: Inner member 15:
Folded ends 16a, 16b: Continuous outer web l7:
Area I9: Excision part

Claims (2)

[Claims] (1) Absorbent cores having a width narrower than the width of the continuous inner web are arranged at given intervals in the length direction of the continuous inner web, and the inner web is sequentially cut in the width direction at the central portion between each of the cores. forming individual inner members, each inner member such that the core is located on a first outer surface and an opposing second outer surface and longitudinal ends of the inner web are substantially colinear; folding each folded inner member in the length direction, and aligning the folded end produced by the folding in the width direction and the opposite end thereof in contact with or in close proximity to each other; and substantially the same width as the inner web. on the inner surfaces of two continuous outer webs, and on both sides within a given surface area corresponding to the extent of each of the first and second outer surfaces of each said inner member, at a given distance along the length of each said outer web. attaching the leg elastic members symmetrically on both sides, and further attaching the waist elastic members in the width direction between the leg elastic members facing each other in the length direction of the outer web; , forming a continuous laminate by overlapping each outer web so that each surface area of each of the outer webs coincides with the first and second outer surfaces of each of the arranged inner members, and stacking the laminate in its length direction. heat-sealing the laminate to the waist elastic member, and heat-sealing the laminate to the waist elastic member, and to the widthwise line between the widthwise folded end of each inner member and the waist elastic member; and the heat seal on the width direction line while cutting in the width direction,
A method for manufacturing a disposable wearing article, comprising the step of cutting out an outer portion along the leg elastic member to form individual articles. (2) The manufacturing method according to claim 1, wherein the core is formed into a mat or sheet shape from fluff pulp, staple fibers, and absorbent polymer particles.