JP2536936B2 - Method for manufacturing disposable wearing article - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing disposable wearing articles such as so-called training pants for infants, incontinence pants, and sanitary pants for women.

[Prior Art and Its Problems] Conventionally, a leg-surrounding and waist-surrounding elastic member is attached to at least one of the continuous inner and outer surface webs, respectively, and the absorbent core is interposed intermittently in the longitudinal direction of the inner and outer surface webs. There is known a manufacturing method in which individual articles are formed by forming a continuous laminate by cutting the laminate at a given portion. For example, as one example, JP-A-57-77304,
Japanese Patent No. 57-117602.

In the process of manufacturing an article of this type including the above-mentioned known technique, in order to define the front and back bodies of individual articles in a continuous laminate having leg and waist elastic members attached, the laminate is divided into two parts. It is necessary to fold and heat-seal the lateral side edges of the individual articles when worn.

However, in the above-mentioned known technique, since the continuous laminated body is folded in two with the elastic member around the leg and the waist which are about to be contracted, the folding is performed under the tension of the laminated body. , It cannot be folded completely in two, in other words, the heat is applied in a state in which a part of each individual article is lifted up, wrinkles are generated, or one of the waist edges of the front and rear bodies to be matched is projected. This can result in sealing, resulting in articles that do not have a neat morphology.

The object of the present invention is to fold the inner member composed of the inner surface web and the core into two in a state where the leg-surrounding and waist-surrounding elastic members do not act on the inner surface web, and shift to the subsequent step, It is an object of the present invention to provide a method for manufacturing a disposable wearing article capable of eliminating such drawbacks.

[Means for Solving the Problems] The present invention for achieving the above-mentioned object is to arrange absorbent cores at given intervals in the length direction of a continuous web, and to give a given web in which each of the cores is located. A method for producing an individual disposable wearing article by mounting a leg-surrounding elastic member and a waist-surrounding elastic member in a surface area to form a continuous laminated body, and heat-sealing and cutting a given portion of the continuous laminated body. Assumption.

In the above manufacturing method, the inner core is formed by arranging absorbent cores at given intervals in the length direction of the inner web. The inner member is provided with the core having a first outer surface and a second outer surface facing the first outer surface.
The inner member is folded over the central portion so that the inner member is located on the outer surface. Then, two continuous outer surface webs, each having a width for covering the first and second outer surfaces, to which elastic members for surrounding the legs and the waist are attached, are superposed on the first and second outer surfaces, respectively, to form the continuous laminate. Is configured. The process after forming this continuous laminated body is the same as the process in the said premise part.

[Operation and Effect] According to the method of the present invention, in a state in which the leg-surrounding and waist-surrounding elastic members do not act on the inner surface web, the inner member composed of the inner surface web and the core is folded in two, and the subsequent step is performed. Because of the transition, the inner member is not subjected to the contracting stress of the elastic member at that time. Therefore, a neat form without the drawback that both edges are heat-sealed with a part of the individual article rising, wrinkles being generated, or one of the waist-surrounding edges of the front and back bodies to be matched protruding. It is possible to obtain an article having

Further, since the core is formed, the shape does not collapse at the time of the folding.

Example An example of the method of the present invention will be described with reference to the drawings.
It is as follows.

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 surrounding portion 2 and a waist surrounding portion 3, and elastic members 4 and 5 are attached to the article 1 and both side edges of the front and rear bodies 6 and 7,
It is constructed by applying heat seals 8 and 9 to the crotch edge. As will be described later, the front and rear bodies 6, 7 include inner and outer surface webs and an absorbent core interposed between the both webs, and the elastic members 4,5 are elastically expandable between the both webs via an adhesive. It is attached.

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

Continuous inner surface web 10 of given width consisting of vertical and horizontal elastic nonwoven fabric
While being moved to an assembly step (not shown), the absorbent core 11 formed at the center of the upper surface of the inner surface web at a given interval in the length direction thereof is smaller than the width of the inner surface web and is preformed in an hourglass shape. Is fixedly arranged with a hot melt adhesive (not shown). The core 11 is formed by mixing fluff pulp, thermoplastic crimped staple fibers and superabsorbent polymer particles almost uniformly, heat-treating this mixture, fusing the staple fibers together, and spraying appropriate moisture. A continuous web is formed by appropriately compressing in the direction, and the web is in a sheet or mat shape,
An hourglass type, that is, a concave portion 12 on both sides at the center, and a center portion cut into a narrow shape, does not easily collapse. The continuous inner web 10 is sequentially cut in the width direction between the opposing cores 11 to form the inner member 13. In each of the inner members 13 thus formed, the half of the core 11 is located on the upper surface (first outer surface) and the other half is located on the lower surface (second outer surface), and both longitudinal ends 14 of the inner surface web are substantially co-linear. The sheets are sequentially folded in the length direction at the center line 15 in the width direction so as to be positioned. Each of the folded inner members 13 is divided into a fold end (center line in the width direction) 15 of one member and an end 14 of the other member.
Are moved to an assembly process while being sequentially contacted or aligned in close proximity.

On the other hand, two continuous outer webs 16a and 16b each having the same width as the continuous inner web 10 and having a vertically and horizontally stretchable nonwoven fabric or a laminate sheet in which a vertically and horizontally stretchable plastic film is intermittently bonded to the inner surface of the nonwoven fabric, or the film alone.
To the assembly process. Outer web 16a, 16b
The inner wall of the inner member 13 and the leg-surrounding elastic members 4 previously extended on both sides within a given surface area 17 corresponding to the widths of the upper and lower surfaces of each inner member 13 are curved in an arc shape to form a hot melt adhesive. Attach with agent (not shown) symmetrically on both sides. The curved shape of the leg-surrounding elastic member 4 is preferably substantially along the lengthwise half of the recess 12 of the core 11. In addition, external web
In the given surface area 17 of 16a, 16b, and between the leg-surrounding elastic members 4 opposed in the lengthwise direction of the outer webs 16a, 16b, the waist-surrounding elastic member 5 pre-extended in the width direction is hot. A melt type adhesive (not shown) is attached in a straight line.

External webs 16a, 16 are provided on the upper and lower surfaces of each of the arranged inner members 13.
b is overlapped such that the surface area 17 coincides with the upper and lower surfaces to form a continuous laminate 18.

Heat seals 8 and 9 are sequentially applied to the laminated body 18 between both side edges along the lengthwise direction, between the widthwise folded ends 15 of the inner members 13 and the waist-surrounding elastic member 5.

Finally, the laminate 18 is sequentially cut in the width direction between the waist-surrounding elastic member 5 and the widthwise heat seal 9, and the outer portion 19 along the curve of the leg-surrounding elastic member 4 is sequentially cut off. Thereby, individual articles 1 (see FIG. 1) are formed.

FIG. 3 is a perspective view schematically showing the process of another embodiment of the method of the present invention.

While moving a continuous inner surface web 20 having a width corresponding to the length of the finished article, which is made of a longitudinal and lateral elastic nonwoven fabric, to the assembly step (not shown), at the center of the upper surface of the inner surface web,
An absorbent core 21 having a length shorter than the width of the web and preliminarily molded into an hourglass shape is oriented in the width direction of the web, and at a given interval in the length direction of the web, a hot melt adhesive ( The inner member 23 is configured by fixedly disposing it (not shown). The core 21 is made by almost uniformly mixing fluff pulp, thermoplastic crimped staple fibers and superabsorbent polymer particles, and heat-treating this mixture to fuse the staple fibers together and spread the appropriate moisture to a thickness. To form a continuous web by appropriately compressing in the direction, and the web is in the form of a sheet or a mat, and is in the shape of an hourglass, that is, the central part is cut into a narrow shape with concave recesses 22 on both sides, It does not lose its shape. In each inner member 23 thus formed, one half of the core 11 is located on the upper surface (first outer surface) and the other half is located on the lower surface (second outer surface), and both longitudinal edges 24 of the inner surface web are substantially collinear. Are moved to the assembly step while being sequentially folded in the length direction center line 25 so as to be located at.

On the other hand, the width of the continuous inner surface web 20 is substantially half the width of the longitudinally and transversely stretchable nonwoven fabric or a laminate sheet obtained by intermittently joining the longitudinally and transversely stretchable plastic film to the inner surface of the nonwoven fabric, or two films consisting of the film alone. The continuous outer surface webs 26a, 26b are moved to the assembly process. Along the vicinity of one side edge (first side edge) of the inner surfaces of the outer surface webs 26a, 26b, the leg-surrounding elastic member 4 is zigzag-shaped, and along the other side edge (second side edge) of the inner surface. The elastic members 5 surrounding the waist are linearly stretched and bonded with a hot melt adhesive (not shown). The zigzag shape of the leg-surrounding elastic member 4 has a concave portion 27a and a convex portion 27b in the length direction of the outer surface webs 26a and 26b.
And are located alternately. With the leg-surrounding and waist-surrounding elastic members 4 and 5 thus arranged, the width-direction defining lines (virtual) 28,2 located at given intervals in the length direction of the outer webs 26a, 26b.
A concave portion 27a is located at the center in the length direction of the surface area 19 defined by 8 ', and the surface area 29 is formed in the width direction defining line (imaginary) 30 located at given intervals in the length direction of the inner member 23. The core 21 has the same size as the surface area 31 defined by 30 ', and the core 21 is located at the center of the surface area 31 in the longitudinal direction. It is preferable that the shape of the inclined or curved portion of the leg-surrounding elastic member 4 is substantially along the lengthwise half of the recess 22 of the core 21.

The upper and lower surfaces of the inner member 13 being moved are provided with outer webs 26a,
26b is laminated on the upper and lower surfaces of the inner member so that the surface areas 29 and 31 coincide with each other to form a continuous laminated body 32.

The laminated body 32 is provided with the first side edge, that is, one side edge on the leg-surrounding elastic member 4 side, and the width direction defining lines 28, 28 ', 3 respectively.
Heat seals 8 and 9 are sequentially applied to the width direction lines (imaginary) along the both sides with 0 and 30 'as the center.

Finally, the laminate 32 is sequentially cut along the widthwise line (imaginary) 33 between the adjacent heat seals 8, and the outer portions 34 along the leg surrounding elastic members 4 of the two articles are sequentially cut off to individually cut. Article 1 (see FIG. 1) is formed.

In the present invention, a device for carrying out this is not illustrated, but it can be carried out by a known device.

[Brief description of drawings]

FIG. 1 is a perspective view of an article manufactured by the method of the present invention, FIG. 2 is a perspective view schematically showing the steps of the method of the present invention, and FIG. 3 is a schematic view of the steps of another embodiment of the method of the present invention. It is a perspective view shown. 1: Article, 4: Leg surrounding elastic member 5: Waist surrounding elastic member, 8,9: Heat seal 10,20: Inner surface web, 11,21: Core 13,23: Inner member 16a, 16b, 26a, 26b : Exterior web 18,32: Laminate

Claims (1)

(57) [Claims] 1. Absorbent cores are arranged at given intervals along the length of a continuous web, and leg and waist elastic members are mounted within given areas of the web in which each of the cores is located. In a method for producing an individual disposable wearing article by forming a continuous laminate by heat-sealing and cutting a given portion of the continuous laminate, an absorbent core is provided at a given interval in a longitudinal direction of an inner web. The inner member is arranged to form an inner member, and the inner member is folded over the central portion so that the core is located on the first outer surface and the second outer surface facing the first outer surface. And two continuous outer surface webs, each having a width covering the first and second outer surfaces, attached to the waist-surrounding elastic member, are stacked on the first and second outer surfaces to form the continuous laminate. And said manufacturing Method.