JPH04317649A - Method for mounting elastic member around leg put with disposable wearing articles - Google Patents

Abstract

PURPOSE:To obtain the easy mounting method which disposes yarn-like elastic members around the legs put with disposable diapers, etc., more widely in the central part (in side leg part) than at both longitudinal ends thereof. CONSTITUTION:Yarn-like materials 4a, 4b, 4c are used as yarn-like connecting members 4A, 4B around the leg put with the articles. While these yarn-like materials are supported in parallel by a traversing means in such a manner that the intervals of the curved arrays thereof are wider in the central part thereof than at both longitudinal ends, the members are introduced in a sine curve form to a continuous web 7 as the material of the articles. The adhesive parts 4A1, 4B1 of these elastic members are adhered and the non-adhesive parts 4A2, 4B2 of the elastic members are cut together with the web 7 at the individual article boundaries inclusive of the adhered parts to allow the members to shrink.

Description

[Detailed description of the invention]

The present invention relates to a method for attaching an elastic member to the leg area of a disposable wearing article such as a diaper, incontinence pants, or training pants.

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disposable wearing articles, and more particularly to disposable wearing articles such as diapers, incontinence pants, and training pants.

Conventionally, this type of wearing article has an elastic member attached around the legs. Generally, the elastic member is an elongated elastic member fixed to at least one of the top and backsheets with an adhesive.

[0004] When wearing an article, there is a lot of leakage of excrement from approximately the lower half of the leg area, so elastic members are widely disposed in approximately the lower half so that the elastic material is relatively widely spread against the wearer's skin. It is preferable that they be able to be brought into pressure contact.

[0005] However, in the articles and their manufacturing methods and apparatuses that have been proposed and put into practical use, no consideration has been given to arranging the elastic member widely in the leg surrounding area, and no consideration has been given to arranging the elastic member in such a manner. does not teach a method or apparatus for attaching elastic members in this manner.

[0006] According to the present invention, the leg surrounding elastic member is disposed approximately in the lower half of the leg surrounding and is wider than the upper half thereof.
The object of the present invention is to provide a method for attaching an elastic member to the leg area of a disposable wearing article.

[0007]

[Means for Solving the Problems] While continuously moving a continuous web to be used as a material for a top sheet or a back sheet of an article, a thread-like continuous elastic member consisting of a plurality of elongated fibers is moved near the tip of a traverse means. The thread-like continuous elastic member is supported by guide portions spaced from each other and arranged in parallel, and the traverse means is reciprocated across the continuous web in the width direction thereof, so that the thread-like continuous elastic member is curved onto the continuous web. Glue in parallel.

[0008] In order to adhere the filamentous continuous elastic member to the continuous web, an adhesive may be applied to the continuous web in advance, and an adhesive may be applied while the filamentous continuous elastic member is placed on the continuous web using the traverse means. There are cases where it is applied.

[0009] Other members constituting the article are laminated on the continuous web to which the filamentous continuous elastic member is bonded. Thereafter, the continuous web is cut along with the thread-like continuous elastic member in the width direction in the region where the thread-like continuous elastic member is not bonded to the continuous web, and the portion of the thread-like continuous elastic member that is not bonded to the continuous web is removed. Shrink it.

0010

[Operation] In the present invention, each of the guide portions of the traverse means arranged parallel to each other at a distance from each other supports the thread-like continuous elastic member consisting of a plurality of thread-like continuous elastic members extending on both sides along the length direction of the continuous web. The thread-like continuous elastic member is reciprocated across the width direction of the continuous web to guide the thread-like continuous elastic member into a curved shape at a constant cycle. Therefore, the thread-like continuous elastic members are bonded in parallel to the continuous web, and the curved parallel spacing (in the area of the individual articles) of the thread-like continuous elastic members is wider in their center and narrower at their ends. will be done. The curved bonded portions of the thread-like continuous elastic members become the thread-like elastic members surrounding each leg of the final article.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 illustrates in a perspective view an article 1 to be manufactured in an embodiment according to the invention. The article 1 has a leg circumference 2 and a waist (torso) circumference 3, each having a filamentous elastic member 4A,
4B and 5 are attached.

FIG. 2 shows an exploded perspective view of article 1. FIG. The article 1 includes a top sheet 6 made of a horizontally and vertically stretchable liquid-permeable nonwoven fabric,
A back sheet 7 made of a non-woven fabric that is stretchable and liquid-impermeable in both directions, a mat or sheet-like water-absorbent core 8 mainly made of cotton-like pulp, and the string-like elastic members 4A and 4B around the legs and waist.
, 5. Top and backsheet 6
, 7, the inseam area 12 located between the front and rear areas 10 and 11.
The concave notch edges 13 of the leg surroundings 2 are formed in the same shape on both side edges. Although not shown, the back sheet 7 can be expanded and contracted vertically and horizontally.
It is also possible to employ a structure in which a vertically and horizontally stretchable liquid-impermeable plastic film is intermittently bonded to the inner surface of a liquid-permeable nonwoven fabric using an adhesive. In this way, it is possible to completely prevent the excretory liquid from permeating the back sheet 7, and when at least the outer peripheral area of the film is intermittently bonded to the top sheet 6 with an adhesive, the top sheet, which is the fabric of the article 1, can be completely prevented. Furthermore, by improving the elasticity of the backsheets 6 and 7 and increasing the elongation stress, it is possible to further improve the fit and adhesion of the article 1 to the body.

The leg-surrounding thread-like elastic members 4A, 4B are made of a plurality of thread-like materials 4a, 4b, etc. made of natural or synthetic rubber, respectively.
It is composed of 4c. The thread-like elastic members 4A, 4B widen the parallel spacing of the thread-like materials 4a, 4b, 4c in the central part (crotch area) in the longitudinal direction, and gradually narrow it from the central part to both end parts in the longitudinal direction. It is bonded to a curved adhesive zone 14 coated with adhesive along the edge of the recessed notch 13 of the backsheet 7, with the elongation stress gradually weakening from the central portion in the longitudinal direction to both ends in the longitudinal direction. . The thread-like elastic member 5 is also composed of a plurality of thread-like materials 5a, 5b, and 5c, and is attached to an adhesive zone (not shown) coated with adhesive along the waist circumference of the backsheet 7, or to these thread-like materials. It is attached with an applied adhesive.

FIG. 3 is a schematic perspective view of a traverse means for carrying out the method of attaching a thread-like continuous elastic member to the continuous web 7, which is the material of the backsheet, as described above, and FIG. FIG. 6 shows an illustrative plan view of a method of attaching an elastic member to a continuous web. This method can be carried out using, for example, a conventionally known disposable diaper manufacturing apparatus, except for the illustrated traverse means. As the device, for example, the one disclosed in Japanese Patent Application Laid-Open No. 3-33201 filed by the present applicant can be used.

In FIG. 3, traverse means 21, 22
, support cylinders 23 and 24 facing parallel to the pair of clamping rollers 34, sliding rods 25 and 26 inserted into both of these support cylinders, and the tips of each of these sliding rods. The guide rods 29 and 30 are vertically provided with support pieces 27 and 28 fixed to the guide rods 29 and 30, respectively. The guide rods 29, 30 have small cylindrical guide portions 33a, 33b, 33c at their lower bent portions 31, 32, respectively. The guide parts 33a, 33b, 33c are the guide rods 29,
30 are spaced apart from each other in the moving direction and positioned in parallel. The bent portions 31 and 32 are located close to the circumferential surface of the nipping roller 34. The sliding rods 25 and 26 are controlled as described later by a traverse cam mechanism (not shown) connected to their base ends.

In FIG. 4, while moving the continuous web 7 along its length at a given speed, adhesive is applied at given intervals on both sides of the continuous web 7 in a concave manner to the side edges thereof. The adhesive zones 14 are sequentially provided by applying the adhesive as shown in FIG. On the other hand, thread-like continuous elastic members 4A, each stretched at a given magnification,
The filamentous materials 4a, 4b, 4c constituting 4B are inserted into the guide holes 33a, 33b, 33c of the traverse means 21, 22, respectively. In this situation, the guide rod 29,
39 is reciprocated across each side region of the continuous web 7 in the width direction at a given speed, the threads 4a, 4b, 4c of each group (thread-like continuous elastic members 4A, 4B) are attached to each adhesive zone 1.
4. Draw a symmetrical sine curve passing along this.

The thread-like continuous elastic members 4A and 4B each move from the first position P1 to the second position P2 and from the second position P2 to the first position P1 by the width W, but from the first position P1 to the second position As it moves to position P2, the elongation rate becomes slightly higher, and as a result, the elongation stress becomes stronger. this is,
The guide rods 29 and 30 force the filamentous continuous elastic members 4A and 4B, which are stretched at a given stretching ratio and run linearly along the length of the continuous web 7, in the lateral direction of the continuous web 7. The continuous elastic members 4A, 4B change from the first position P1 to the second position P1 due to the resistance at that time.
This is because it is expanded as it moves to 2. However, this depends on the running speed of the filamentous continuous elastic members 4A, 4B in the longitudinal direction and the moving speed of the guide rods 29, 30 in the lateral direction.

Furthermore, each group of filamentous materials 4a, 4b, 4
c is achieved by forcibly moving these filamentous objects, which are moving parallel to the length direction of the continuous web 7, in the lateral direction of the continuous web 7 using the guide rods 29 and 30, so that they are moved to the first position P1.
The distance between the plurality of lines becomes wider as the line moves from the position to the second position P2. This includes the guide portions 33a, 33b,
33c are spaced apart from each other and arranged in parallel in the direction crossing the moving direction of the continuous web 7, and the filamentous materials 4a, 4b,
The traverse means 2 is arranged such that the radius of curvature of the curved adhesive zone 14 increases from both longitudinal ends of the curved adhesive zone 14 to its center.
1 and 22 are controlled.

[0019] Thus, the bonded portions 4A1, 4A1, 4B of the filamentous continuous elastic members 4A, 4B pass over and along each bonded zone 14.
4B1 is pressed by the nipping roller 34 and adhered to each adhesive zone 14. Non-bonded portions 4A2 of thread-like continuous elastic members 4A and 4B that do not pass over the bonded zone 14 and along them
, 4B2 contracts and becomes linear while retaining some elongation stress. It is essential to retain the elongation stress for the reasons described later, and doing so will affect the elongation rate of the filamentous continuous elastic members 4A, 4B and the non-bonded portions 4A2, 4.
It can be determined by the radius of curvature of B2.

FIGS. 5 and 6 show a perspective view and a plan view, respectively, in which the arrangement of the traverse means and the thread-like continuous elastic members shown in FIGS. 3 and 4 are partially modified. That is, in the embodiment shown in these figures, the filamentous continuous elastic member 4A,
This shows the case where adhesive is applied directly to 4B intermittently.

In FIG. 5, adhesive application means 35 are attached to the lower ends of the guide rods 29, 30 and communicate with the guide portions 33a, 33b, 33c. This means 35 is intermittently supplied with a flexible hose 3 from a separate adhesive supply device (not shown).
6, the adhesive is supplied at a constant pressure to intermittently apply the adhesive in the length direction of the thread-like continuous elastic members 4A, 4B. Therefore,
As shown in FIG. 6, the adhesive-applied portions of the thread-like continuous elastic members 4A, 4B, that is, the adhesive portions 4A to the continuous web 7
1,4B1 (each filament 4a, 4b
, 4c, where adhesive is applied continuously). As a method for independently applying the adhesive to the filamentous materials 4a, 4b, and 4c, it is possible to use the application means (nozzle) disclosed in Japanese Patent Application Laid-open No. 180601/1983 filed by the present applicant.

[0022] In this invention, as mentioned above, since the method is to bond a filamentous continuous elastic member with an adhesive while bending it into a continuous web using a traverse means, it is essential that the continuous elastic member used be made of a filamentous material. It is. For example, if the continuous elastic member is made of a relatively wide material,
In the method of the present invention, the continuous elastic member is twisted and does not adhere well to the continuous web, and is likely to separate during the adhesion operation. The cross-sectional shape of the filamentous continuous elastic member may be circular (including elliptical), square, or other irregular shapes, but it is not preferable that the ratio of the longest cross-sectional dimension to the smallest cross-sectional dimension is too large.

[0023] To attach the filamentous elastic member 5 to the continuous web 7, any known apparatus and method for manufacturing disposable diapers can be used. The filamentous elastic member 5 is
A relatively wide tape-like material may be used instead of a plurality of thread-like materials.

Although not shown, the core 8 has a continuous web 7
The previously formed core 8 is placed between the bonded portions 4A1 and 4B1 of the filamentous continuous elastic members 4A and 4B facing each other in the width direction, and another continuous web (Fig. (not shown) and is laminated onto at least the continuous web 7 via an adhesive, the bonded portion 4
A part of these continuous webs located outside A1, 4B1 is cut to form a continuous laminate.

[0025] The continuous laminate is formed into a filamentous continuous elastic member 4A.
, 4B at the center of the non-adhesive parts 4A2, 4B2 (
4 and 6) to obtain individual wearable articles. As a result of this cutting, the filamentous continuous elastic member 4A
, 4B contract (snap back) due to the elongation stress remaining therein.

[0026] Each of the wearable articles constructed in this way is constructed by folding them in half in the longitudinal direction at their central portions and joining the two side edges by heat sealing means, thereby forming the article 1 shown in Fig. 1. .

The continuous web to which the filamentous continuous elastic member is attached may be the material of the top sheet.

[0028]

According to the present invention, a plurality of thread-like elastic members are arranged around the legs of each article in a suitable arrangement as the leg-surrounding elastic members of the article, that is, in parallel to each other and in a curved shape. Moreover, it can be easily attached to a component of an article such that the parallel spacing is wider at the center (crotch area) than at both ends.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an article to be manufactured in an embodiment according to the invention.

FIG. 2 is an exploded perspective view of the article.

FIG. 3 is a schematic perspective view of a traversing means for carrying out a method for attaching thread-like continuous elastic members to a continuous web;

FIG. 4 is a plan view illustrating a method of attaching a thread-like continuous elastic member to a continuous web using the traverse means.

FIG. 5 is a partially modified perspective view of the traverse means shown in FIG. 3;

FIG. 6 is a plan view showing a partially modified arrangement method of thread-like continuous elastic members shown in FIG. 4;

[Explanation of symbols]

4A First filamentous continuous elastic member 4B Second filamentous continuous elastic member 7 Continuous web 14 Adhesive zone 21 First traverse means 22 Second traverse means

Claims (2)

[Claims] 1. A step of continuously supplying a continuous web to be used as a material for a top sheet or a back sheet; applying an adhesive so as to form first and second adhesive zones each extending symmetrically and concavely along both sides of the continuous web; While supplying the first and second thread-like continuous elastic members each consisting of a plurality of pieces, the first
and a second traverse means, each of which supports the first and second thread-like continuous elastic members in parallel and spaced from each other, and supports the first and second thread-like continuous elastic members so as to cross the moving continuous web in the width direction thereof. By reciprocating the traverse means, the guide portions of the first and second traverse means are aligned respectively on the first and second adhesive zones located on both sides of the continuous web, and The parallel spacing between the first and second thread-like continuous elastic members in the longitudinal center of the second adhesive zone is wider than the parallel spacing at both ends of the adhesive zone, and the first and second thread-like continuous elastic members and laminating other members constituting the wearable article on the continuous web, the first and second filamentous continuous elastic members are attached to the continuous web. Cutting the continuous web together with the first and second thread-like continuous elastic members in the width direction of the continuous web in the non-adhered region, and removing the portions of the first and second thread-like continuous elastic members that are not glued to the continuous web. A method for attaching an elastic member to a leg circumference of a disposable wearing article, the method comprising the step of shrinking an elastic member. 2. A step of continuously supplying a continuous web to be used as a material for a top sheet or a back sheet; supplying the continuous elastic members respectively, and supporting the first and second filamentous continuous elastic members respectively in the mutually spaced apart and parallel guide portions of the first traverse means; a step of intermittently applying adhesive in the length direction of the first and second filamentous continuous elastic members using an adhesive supplying means held so as to be driven near the tip portion; and a step of applying adhesive in the width direction of the moving continuous web. By reciprocating the first and second traverse means across the length of the continuous web, the portions of the first and second thread-like continuous elastic members coated with the adhesive are moved along the lengthwise side edges of the continuous web. , and the first and second filamentous continuous elastic members are each parallel to each other at a central portion of the adhesive-applied portion, and the distance between the first and second thread-like continuous elastic members is greater than the distance between the two ends of the first and second thread-like continuous elastic members. widening and adhering the adhesive-applied portions of the first and second thread-like continuous elastic members in parallel to both sides of the continuous web in the concave state, and other members constituting the wearable article. After laminating the continuous web onto the continuous web, in the region where the first and second thread-like continuous elastic members are not bonded to the continuous web, the continuous web is laminated along with the first and second thread-like continuous elastic members in the width direction of the continuous web. cut,
A method for attaching an elastic member to a leg circumference of a disposable wearing article, comprising the step of shrinking portions of the first and second filamentous continuous elastic members that are not bonded to the continuous web.