JP2849234B2 - A method of attaching an elastic member around the leg of a disposable wearing article - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a method of attaching an elastic member to a leg surrounding of a disposable wearing article such as a diaper, incontinence pants and training pants.

[0002]

BACKGROUND 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 to a leg surrounding. Generally, the elastic member has an elongated elastic member fixed to at least one of the top and back sheets with an adhesive.

When an article is worn, there is a large amount of excretion leaking from almost the lower half of the leg surroundings. It is preferable to be able to make pressure contact.

[0005] However, in the articles proposed and put into practical use conventionally, and methods or apparatuses for manufacturing the articles, no consideration is given to arranging the elastic member widely in the leg surrounding portion, and such an arrangement is adopted. Does not teach a method or apparatus for attaching an elastic member.

According to the present invention, the leg surrounding elastic member is disposed in a substantially lower half of the leg surrounding and wider than the upper half thereof.
A method of attaching an elastic member to a leg surrounding a disposable wearing article is provided.

[0007]

While continuously moving a continuous web to be used as a material of a top sheet or a back sheet of an article, a plurality of elongated thread-like continuous elastic members are formed near the tip of the traverse means. By supporting the guide members in parallel with each other spaced apart from each other, and by reciprocating the traverse means so as to cross the continuous web in the width direction, the thread-like continuous elastic member is bent to the continuous web in a continuous state. Glue in parallel.

In order to adhere the continuous elastic web member to the continuous web, an adhesive is applied to the continuous web in advance, or the adhesive is applied while the continuous continuous web member is arranged on the continuous web by the traverse means. May be applied.

On the continuous web to which the thread-like continuous elastic member is adhered, another member constituting the article is laminated. Thereafter, in a region where the thread-shaped continuous elastic member is not bonded to the continuous web, the continuous web is cut together with the thread-shaped continuous elastic member in a width direction thereof, and a portion of the thread-shaped continuous elastic member that is not bonded to the continuous web is removed. Shrink.

[0010]

According to the present invention, each of the guide portions of the traverse means which are spaced apart from each other and arranged in parallel support the thread-like continuous elastic member comprising a plurality of wires extending on both sides along the length direction of the continuous web. It reciprocates so as to cross in the width direction of the continuous web, and guides the thread-like continuous elastic member to the continuous web in a curved shape at a constant period. Thus, the thread-like continuous elastic members are adhered in parallel to the continuous web, and the thread-like continuous elastic members have a curved parallel spacing (in the area of individual articles) wide at their center and narrow at their ends. Will be done. The curved adhesive portion of the thread-like continuous elastic member becomes a thread-like elastic member surrounding each leg of the final article.

[0011]

FIG. 1 is a perspective view illustrating an article 1 to be manufactured in an embodiment according to the present invention. The article 1 has a leg enclosure 2 and a waist (torso) enclosure 3, and each has a thread-like elastic member 4A,
4B and 5 are attached.

FIG. 2 is an exploded perspective view of the article 1. The article 1 includes a top sheet 6 made of a vertically and horizontally stretchable liquid-permeable nonwoven fabric,
A backsheet 7 made of a vertically and horizontally stretchable liquid-impermeable nonwoven fabric, a mat or sheet-like water-absorbing core 8 mainly made of cotton-like pulp, and the leg-like and waist-like thread-like elastic members 4A, 4A
B and 5. Inseam area 1 located between front and rear areas 10, 11 of top and back sheets 6, 7
The recessed edges 13 of the leg enclosure 2 are formed in the same shape on both side edges of the leg enclosure 2. Although not shown, the back sheet 7 may be formed of a vertically and horizontally stretchable and liquid-permeable nonwoven fabric formed by intermittently joining an inner surface of a vertically and horizontally stretchable and liquid-impermeable plastic film with an adhesive. . This makes it possible to completely prevent the excreted liquid from penetrating through the back sheet 7 and to intermittently bond at least the outer peripheral area of the film to the top sheet 6 with an adhesive. In addition, the elasticity of the back sheets 6 and 7 can be improved and the elongation stress can be increased to further improve the conformability of the article 1 to the body.

The leg-surrounding thread-like elastic members 4A, 4B are respectively composed of a plurality of thread-like objects 4a, 4b, 4 made of natural or synthetic rubber or the like.
4c. The thread-like elastic members 4A, 4B increase the parallel spacing of the thread-like materials 4a, 4b, 4c at a central portion in the longitudinal direction (inseam area), and gradually narrow from the central portion to both ends in the longitudinal direction. The elongation stress is gradually reduced from its longitudinal center to its longitudinal ends, and is adhered along the edge of the concave portion 13 of the backsheet 7 to the curved adhesive zone 14 coated with adhesive. . The thread-like elastic member 5 is also composed of a plurality of thread-like materials 5a, 5b, 5c, and is attached to an adhesive zone (not shown) where an adhesive is applied along the waist of the back sheet 7, or to those thread-like materials. It is adhered with the applied adhesive.

FIG. 3 is a schematic perspective view of a traverse means for carrying out a method of attaching the continuous thread-like elastic member to the continuous web 7 which is a material of the back sheet as described above. FIG. 4 is a perspective view of the traverse means. FIG. 3 is a plan view illustrating 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 traversing means. As the apparatus, for example, the apparatus disclosed in Japanese Patent Application Laid-Open No. 33201/1991 filed by the present applicant can be used.

In FIG. 3, traversing means 21, 22
Are supporting cylinders 23 and 24 facing the pair of holding rollers 34 in parallel with them, sliding rods 25 and 26 respectively inserted in both supporting cylinders, and respective tips of these sliding rods. And guide rods 29 and 30 vertically suspended by support pieces 27 and 28 fixed to the support rods. The guide rods 29, 30 have small tubular guides 33a, 33b, 33c at their lower bent portions 31, 32, respectively. The guide portions 33a, 33b, 33c are
30 in parallel with each other in the direction of movement. The bent portions 31 and 32 face close to the peripheral surface of the holding roller 34. The sliding rods 25 and 26 are controlled by a traverse cam mechanism (not shown) connected to these base ends as described later.

In FIG. 4, while moving the continuous web 7 at a given speed in its length direction, the adhesive is concavely bent at both sides of the continuous web 7 in the length direction at a given interval. Thus, the adhesive zone 14 is sequentially provided. On the other hand, the thread-shaped continuous elastic members 4A,
Threads 4a, 4b, 4c constituting 4B are inserted into guide holes 33a, 33b, 33c of the traverse means 21, 22 respectively. In such a state, the guide rod 29,
39 is reciprocated across the respective side areas of the continuous web 7 at a given speed in the width direction, and the filaments 4a, 4b, 4c of each group (filament continuous elastic members 4A, 4B) become
Draw a symmetric sine curve that passes along 4 above.

[0017] Filamentous continuous elastic members 4A, 4B, respectively, from the first position P ₁ to the second position P _2, but moves each of the first position P ₁ to the width W from the second position P _2, the first position elongation rate slightly higher with the move from P ₁ to the second position P _2, as a result, tensile stress increases. This is because the guide rods 29 and 30 forcibly force the continuous webs 7 to extend along the length of the continuous webs 7A and 4B running linearly along the longitudinal direction of the web 7 at a given stretching magnification. Although diverting laterally, continuous elastic members 4A by the resistance at that time, 4B is because is elongated along to move from the first position P _1, respectively to the second position P _2. However,
This depends on the traveling speed of the thread-shaped continuous elastic members 4A, 4B in the length direction and the moving speed of the guide rods 29, 30 in the lateral direction.

Further, the filaments 4a, 4b, 4
c, the first position P ₁ is obtained by forcibly moving these thread-like materials moving parallel to the length direction of the continuous web 7 in the lateral direction of the continuous web 7 with the guide rods 29 and 30.
Spacing of the plurality present with the move to the second position P ₂ is widened from. This is because the guides 33a, 33b,
33c are spaced apart from each other in a direction intersecting the moving direction of the continuous web 7, and are arranged in parallel.
4c so that the radius of curvature of the traverse means 2c increases from the longitudinal ends of the curved adhesive zone 14 to the center thereof.
This is because 1 and 22 are controlled.

Thus, the adhesive portions 4A ₁ , 4A of the threadlike continuous elastic members 4A, 4B passing over and along the respective adhesive zones 14
4B ₁ is pressed by the holding roller 34 and adhered to each adhesive zone 14. The non-adhesive portions 4 of the thread-like continuous elastic members 4A, 4B that do not pass along the adhesive zone 14 along these.
A ₂ and 4B ₂ contract and become linear with some residual elongation stress. It is indispensable to have a residual elongation stress in this way for the reason described later, and to do so, it is necessary to increase the elongation rate and the non-adhesion portion 4A ₂ ,
It can be determined by a radius of curvature of the 4B _2.

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

In FIG. 5, an adhesive applying means 35 communicating with the guide portions 33a, 33b, 33c is provided at the lower ends of the guide rods 29, 30. The flexible hose 3 is intermittently connected to this means 35 from an adhesive supply device (not shown) provided separately.
The adhesive is supplied at a constant pressure through the adhesive 6 and is applied intermittently in the longitudinal direction of the thread-like continuous elastic members 4A and 4B. Therefore,
As shown in FIG. 6, the adhesive applied portions of the thread-shaped continuous elastic members 4A and 4B, that is, the adhesive portions 4A to the continuous web 7
₁ , 4B ₁ (each thread 4a, 4b,
This is indicated by a short line crossing 4c, but this area is continuously coated with adhesive). As a method of independently applying the adhesive to the filaments 4a, 4b, and 4c, a coating means (nozzle) disclosed in Japanese Patent Application Laid-Open No. 58-180601 filed by the present applicant can be used.

In the present invention, as described above, the continuous elastic member to be used is made of a thread-like material because the continuous elastic member to be used is bonded to the continuous web with the adhesive while being bent to the continuous web by the traverse means. It is. For example, when the continuous elastic member is made of a relatively wide material, the method according to the present invention twists the continuous elastic member and does not adhere well to the continuous web, and easily peels off during the bonding operation. The cross-sectional shape of the thread-like continuous elastic member may be circular (including an elliptical shape), square, or other irregular shape, but it is not preferable that the ratio of the longest cross-sectional dimension to the minimum cross-sectional dimension is too large.

In order to attach the thread-like elastic member 5 to the continuous web 7, a disposable diaper manufacturing apparatus and method known in the art can be used. The thread-like elastic member 5
Instead of a plurality of filaments, a single relatively wide tape may be used.

Although not shown, the core 8 comprises a continuous web 7
The previously formed cores 8 are placed between the adhering portions 4A ₁ and 4B ₁ of the thread-like continuous elastic members 4A and 4B facing each other in the width direction, and another continuous web as a material of the top sheet 6 is placed on the upper surfaces thereof. (Not shown) and laminated on at least the continuous web 7 via an adhesive,
A part of the continuous web located outside of A ₁ and 4B ₁ is cut off to form a continuous laminate.

[0025] The continuous laminated body is
A and 4B are cut at the center of the non-adhesive portions 4A ₂ and 4B ₂ (on the line indicated by reference numeral 37 in FIGS. 4 and 6) to obtain individual wearing articles. As a result of this cutting, the thread-shaped continuous elastic member 4
The non-adhered portions 4A ₂ and 4B _{2 of} A and 4B contract (snap back) due to the extension stress remaining in them.

Each of the wearing articles configured as described above is folded into two in the longitudinal direction at the center thereof, and both side edges thereof are joined by heat sealing means, thereby constituting the article 1 shown in FIG. .

The continuous web on which the thread-like continuous elastic member is to be attached may be the top sheet material.

[0028]

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

[Brief description of the drawings]

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

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

FIG. 3 is a schematic perspective view of a traverse means for implementing a method of attaching a continuous continuous elastic member to a continuous web.

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

5 is a perspective view in which a part of the traverse means shown in FIG. 3 is modified.

FIG. 6 is a plan view in which a part of the method of arranging the thread-like continuous elastic members shown in FIG. 4 is modified.

[Explanation of symbols]

 4A First thread-shaped continuous elastic member 4B Second thread-shaped continuous elastic member 7 Continuous web 14 Adhesion zone 21 First traverse means 22 Second traverse means 33a, 33b, 33c Guide portion

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-242643 (JP, A) JP-A-4-122257 (JP, A) JP-A 64-52801 (JP, A) JP-A 57- 117602 (JP, A) JP-A-58-180601 (JP, A) JP-A-3-33201 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61F 5/44 A61F 13 / 15

Claims (2)

(57) [Claims] 1. A step of continuously supplying a continuous web to be a material of a topsheet or a backsheet, intermittently on both sides along the lengthwise direction of the continuous web and in the lengthwise direction of the continuous web. Applying an adhesive such that first and second adhesive zones are respectively formed symmetrically concave with respect to both side edges thereof, and extending on both sides along the longitudinal direction of the continuous web, respectively. A plurality of first and second thread-shaped continuous elastic members are supplied, and
The first and second thread-like continuous elastic members are supported by respective guide portions of the second traverse means which are spaced apart from each other and are parallel to each other, and the first and second thread members are moved across 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 respectively aligned on the first and second adhesive zones located on both sides of the continuous web, and The first and second thread-like continuous elastic members are arranged such that a parallel interval between the first and second thread-like continuous elastic members at a central portion in a longitudinal direction of the second adhesive zone is wider than a parallel interval at both ends of the adhesive zone. After the step of bonding the first and second adhesive zones in parallel to the first and second adhesive zones, and the step of laminating other members constituting the wearing article on the continuous web, the first and second thread-shaped continuous elastic members are attached to the continuous web. In a region not bonded to the continuous web, the continuous web is cut in the width direction together with the first and second thread-shaped continuous elastic members, and the first and second thread-shaped continuous elastic members not bonded to the continuous web are cut off. Shrinking a portion of the disposable wearing article. 2. A step of continuously supplying a continuous web to be used as a material of a top sheet or a back sheet, and a first and a second filaments each comprising a plurality of webs extending on both sides along the length direction of the continuous web. A step of supplying a continuous elastic member; and a step of supporting the first and second thread-shaped continuous elastic members while supporting the first and second thread-like continuous elastic members on respective guide portions of the first traverse means which are spaced apart from each other and arranged in parallel. A step of applying an adhesive intermittently in the length direction of the first and second thread-shaped continuous elastic members by an adhesive supply means held so as to be driven in the vicinity of the distal end; By reciprocating the first and second traversing means so as to traverse, the portions of the first and second thread-shaped continuous elastic members to which the adhesive has been applied extend along the length direction of the continuous web. Symmetrical concaves with respect to both side edges of the first and second thread-like continuous elastic members, and the respective parallel intervals at the central portions of the portions where the adhesive is applied of the first and second thread-like continuous elastic members are respectively set at the respective end portions thereof. A step of bonding the adhesive-applied portions of the first and second thread-shaped continuous elastic members to the both sides of the continuous web in the concavely curved state, respectively, in parallel with each other, and forming a wearing article. After laminating another member on the continuous web, in a region where the first and second thread-shaped continuous elastic members are not bonded to the continuous web, the continuous web is moved in the width direction of the first and second thread-shaped continuous elastic members. Cut with the elastic member,
Shrinking portions of the first and second thread-like continuous elastic members that are not adhered to the continuous web.