JPH08132576A - Swing bonding method for elastic component - Google Patents

Abstract

PURPOSE: To provide a swing bonding method for an elastic component which copes with high speed production capable of obtaining certainly a curved shape of a required elastic component, and especially when an absorbable article is manufactured, is suitable for fixing the elastic component onto a web to be connected with an adhesive. CONSTITUTION: One side or both sides of mutually bonded faces of first and second webs 1', 2' which are continued, are coated with an adhesive 4. The adhesive-coated first and second webs 1', 2' are fed to nip rolls 19 without bringing the adhesive coated surface in contact with the other components. Then, at least one continuous elastic component 3' is forcedly stretched, and the stretched elastic component 3' is reciprocated with a swing guide 17 in a direction crossing at right angles with an advance direction of the first and second webs 1', 2' on this side of the nip rolls 19. The stretched elastic component 3' is fed between the first and second webs 1', 2' while the stretched elastic component 3' is swung thereby, and they are pressurized with the nip rolls 19 to fix the elastic component 3' by bonding between the first and second webs 1', 2'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article used for infants, adults and incontinent persons, for example, a method for swing-bonding elastic members suitable for producing disposable diapers. The present invention relates to a method for swing-bonding an elastic member, which can surely obtain a desired curved shape of the elastic member and which fixes the elastic member to a sheet member in a stretchable state.

[0002]

2. Description of the Related Art In recent years, absorbent articles having elastic members fixed in a curved shape and capable of expanding and contracting are on the market. Such an absorbent article has a shirring effect that matches the wearer's body shape, and has improved fit and leak prevention performance. Examples of the method for producing such an absorbent article include "diaper briefs and a method for producing the same" in JP-A-57-77304, "production method for a diaper brief" in JP-A-57-117602, and JP-A- No. 58-174602, “Method and device for fixing elastic member to moving web”, “Diaper with cover and manufacturing method and manufacturing device thereof” in JP-A-60-45602 are known, In these documents, a method of adhering an elastic member in a curvilinearly stretchable state (hereinafter referred to as a rocking adhering method of the elastic member) is described. In addition, JP-A-3-3320
The "method for manufacturing a disposable brief" in Japanese Patent No. 1 also describes a method for swing-bonding elastic members.

[0003]

However, in the method of swing-bonding an elastic member as disclosed in Japanese Patent Laid-Open No. 57-117602, the adhesive is applied to the elastic member before the swinging guide. In order to do so, the adhesive adheres and grows on the swing guide, not only reduces the adhesive strength of the elastic member by scraping off the adhesive applied to the elastic member, but it is difficult to perform intermittent application of the adhesive completely, There is a drawback in that the swing guide must be cleaned and maintained frequently. On the other hand, it is conceivable to use a nozzle that discharges the adhesive as a swing guide, but in this case, the weight of the swing part becomes considerably heavy when the supply path and nozzle assembly are combined, and the load on the swing mechanism is increased. Takes a
This is not a practical method because it causes a decrease in processing speed.

Further, according to the method for manufacturing a disposable brief in Japanese Patent Laid-Open No. 3-33101, although the adhesive is applied to the sheet member, there is a step in which the roll directly contacts the adhesive-coated surface. There is a problem in that it is apt to fall off, the adhesive adheres and grows on the roll, and the elastic member is broken or the sheet member is broken.

Accordingly, an object of the present invention is to cope with high-speed production in which a desired curved shape of an elastic member can be reliably obtained in a method of joining an elastic member to a continuous sheet in a curved shape and in a stretchable state. It is an object of the present invention to provide a method for swing-bonding an elastic member, which is suitable for fixing the elastic member on a continuous web with an adhesive in the manufacturing method, particularly in manufacturing a disposable absorbent article.

[0006]

SUMMARY OF THE INVENTION The present invention is a method of securing an elastic member on a continuous web with an adhesive, wherein one or both of the surfaces of the continuous first web and the continuous second web to be joined together. An adhesive is applied to the first web and / or the second web on which the adhesive is applied to the nip roll without contacting the coated surface of the adhesive with another member, and at least Forcibly stretching one continuous elastic member, and reciprocating the stretched elastic member with a swing guide in a direction orthogonal to the traveling direction of the first web and the second web in front of the nip roll. While being swung by the nip roll, the elastic member, the first web, and the second web are supplied between the first web and the second web.
The above object is achieved by providing a method for swing-bonding an elastic member, characterized in that the web is pressed and the elastic member is adhesively fixed between the first web and the second web. Further, by the method for manufacturing an absorbent article according to the seventh aspect, it is possible to preferably manufacture the absorbent article while achieving the above object.

By the way, a problem in the method of swing-bonding the elastic member is how to bond and hold the stretched elastic member to the sheet member in a swing shape. When the elastic member is adhered to the sheet member in a curved shape, the elastic stress that tries to return the elastic member to the linear shape acts, and the sheet member is required to have a holding force that resists the elastic stress and holds the elastic member. It Factors that exert a holding force for the elastic member swinging shape include material relations and manufacturing devices. Examples of materials include adhesive materials and coating amounts, sheet member materials, and elastic member materials. With regard to the above, although the applicant of the present application discloses the swing bonding of the elastic member in Japanese Patent Application Laid-Open No. 6-70958, it does not disclose the detailed technique (apparatus). The present invention also provides a method for efficiently generating the holding force of the sheet member in the swing-bonded shape of the elastic member, and at the same time, an apparatus capable of suitably carrying out the method of the present invention will be described.

[0008]

According to the present invention, the elastic member having an arbitrary curved shape can be surely fixed to the continuous web, the adhesive to be coated does not fall off, and the adhesive does not grow. The load on the motion guide can be suppressed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for swing-bonding elastic members according to the present invention will be described below with reference to the drawings together with an embodiment in the case of being used in a method for manufacturing an absorbent article. FIG. 1 is a perspective view of a swing-bonding device for elastic members according to an embodiment of the method of the present invention.
3 is an enlarged side view around the nip roll of this embodiment, FIG.
Is a partially cutaway plan view of a disposable flat type diaper manufactured by the method of the present invention, FIG. 4 is a partially cutaway plan view of another disposable flat type diaper manufactured by the method of the present invention, and FIG. It is a partial notch deployment top view of another disposable underpants type diaper manufactured by the method of this invention.

As shown in FIG. 1, the first web roll 1 is unwound by a feeding means (not shown),
The continuous first web 1 ′ is supplied to the nip roll 19. As the feeding means, axis drive, surface drive, etc.
Well-known and publicly available ones can be used. Further, when the path to the nip roll 19 is long, it is preferable to arrange the feed roll means.

As shown in FIG. 1, the second web roll 2 is unwound by a feeding means (not shown),
The continuous second web 2 ′ is supplied to the nip roll 19. In the middle of the process, the hot-melt adhesive coating device 20 coats the hot-melt adhesive 4 on the surface of the second web 2 ′ facing the first continuous web 1 ′. The hot-melt adhesive 4 is continuously applied over substantially the entire width of the second web 2 ', but is applied only to a portion where elastic properties of the elastic member are required by an appropriate apparatus and method. Needless to say. Further, when the elastic member is introduced, it is possible to control the elongation rate of a specific portion to which the elastic member is fixed by making the specific member non-adhesive and relaxing the elastic member.

In this embodiment, the hot-melt type adhesive 4 is used as the adhesive, but the hot-melt type adhesive coating device 20 faces the discharge port of the hot-melt type adhesive 4 and is a backup roll. 21 is provided. The backup roll 21 is a cooled roll, and is preferably subjected to a non-adhesive treatment that allows the hot melt adhesive 4 to be easily peeled off and dropped even if the hot melt adhesive 4 is attached to the roll surface. As the non-adhesive treatment of the roll surface, it is common to apply a non-adhesive silicon lining to the metal of the roll or subject the surface to fluorine treatment. Backup roll 2
The cooling treatment 1 can prevent the hot melt adhesive 4 from oozing out to the surface of the second web 2 '. Excessive cooling accelerates solidification of the hot melt adhesive 4 and cools and solidifies before the elastic member is introduced. Therefore, when designing the device, the cooling time, cooling speed, etc. must be taken into consideration. .

As the hot-melt type adhesive coating device 20, various known types such as spiral spray, slot coat, multi-bead, curtain spray, gravure coat and screen coat can be used. As an intermittent pattern coating method for the adhesive 4, a method of mechanically controlling with a screen coat, a gravure coat, a mechanical valve or the like, or a method of connecting a solenoid valve to a gun module and controlling a coating position with a controller is generally used. is there.

Feeding means 1 from the elastic member original fabrics 3, 3.
The pair of first and second elastic members 3 ′ and 3 ′ are fed by 0, pass through the first feed roll 11, and are separated by the liner 12
Thus, the first and second elastic members 3'and 3'are each divided into three thread-shaped rubbers. First and second separated line
The elastic members 3 ′ and 3 ′ are passed through the second feed roll 13 and the supply roll 14, and then the first and second swing guides 1 respectively.
7 and 17 are supplied.

In this embodiment, a speed difference is provided between the first feed roll 11 and the second feed roll 13 before and after the liner 12, and the first and second elastic members 3 ', 3',
3'is extended between the first feed roll 11 and the second feed roll 13, and the second feed roll 13
Is preferably rotated at a speed of 1.5 times or more with respect to the first feed roll 11.

As the elastic member 3 ', two windings of natural rubber that can be divided into three lines, so-called three-ends, are used. However, it is also possible to substitute one of the 6-end windings. However, when it is desired that the first elastic member 3 ′ and the second elastic member 3 ′ are bonded at the same distance and have different expansion rates, or if the first elastic member 3 ′ and the second elastic member 3 ′ are different.
When the elastic members 3 ′ are bonded at different distances and the respective elongation rates are desired to be the same, it is preferable to prepare two original fabrics (rolls). As the material of the elastic member 3 ', thread-shaped rubber, flat rubber, ribbon-shaped elastic body,
A heat-shrinkable material, a water-absorbent shrinkable fiber, or the like, each of which has elastic elasticity, can be used.

Feeding means 10, first feed roll 1
The first and second feed rolls 13 are necessary for ensuring a stable expansion rate of the elastic member 3 ′, and regarding the operation of the expansion rate distribution during the swing bonding of the elastic member,
Depending on the swinging shape of the elastic member, it can be freely performed by shifting the feeding means 10, the first feed roll 11 and the second feed roll 13.

The first and second elastic members 3 ', 3'are supplied to the nip roll 19 through the guide holes 18, 18, ... Of the first and second swing guides 17, 17 in the swing portion 15, respectively. To be done. First and second swing guides 17, 1
7 is slidable on the cylindrical shaft 22 by the linear bush 23, and is driven by the swinging means 16 (only one of which is shown in the figure) to move in the traveling direction of the first and second webs 1 ', 2'. It is reciprocated almost vertically. Two cylindrical shafts 22 are provided in parallel so that the swing guide 17 does not rotate.

In this embodiment, the swinging means 16 is a crank piston mechanism, and a position control motor is attached to drive the crank mechanism. Cam, link,
A known mechanism such as a crank, a ball screw, or another mechanism, or an assembly for driving by a position control motor can be used, and an arbitrary swing of the elastic member 3 ′ can be performed by a method corresponding to the swing means using these mechanisms. Form a shape. The procedure is to design an arbitrary rocking shape → select a rocking mechanism.
Examination → Design calculation for rocking mechanism → Modification of rocking locus and rocking shape → Device design and manufacturing. If the design of the oscillating shape and the weight (load) of the oscillating guide are determined, the oscillating mechanism for high-speed machining will be narrowed down, but some trial and error will be required to study the modification of the shape and trajectory. It is said that

In the pair of nip rolls 19 and 19, the first web 1 ', the second web 2'and the first and second elastic members 3'and 3'swing between them are simultaneously piled up and pressed. Then, the composite continuous web 5 is formed by being integrated with the hot melt adhesive 4. It is preferable that the pair of nip rolls 19 and 19 have a pressurizing means (not shown), and one of them can be driven, and one of them may be a fixed roll and the other may be a pressurizing roll. It may be a pressure roll, one of which may be a large diameter drum and the other may be a pressure roll. As the pressurizing means, known ones can be used, such as hydraulic pressure and liquid pressure, air pressure and other atmospheric pressure, and spring pressure. Further, when the pressing means is not used, the pressing effect can be obtained by making the distance between the rolls narrower than the total thickness of the material to be inserted. The pressure at the time of pressurization is a factor that determines the adhesive holding force of the elastic member, along with the material of the hot melt adhesive, the coating basis weight, the material of the sheet to be adhered, the material of the elastic member, and the like.

What is important here is the swing guides 17 and 1.
Depending on the size and shape of the guide holes 18, 18, ...
There is a big change in the swing shape. The elastic members 3 ′, 3 ′ are basically in the extended state and the swing guides 17, 17
, Through the guide holes 18 ,. Elastic member 3 ',
There are various shapes such as a circle, a quadrangle, and a hexagon in the cross section of 3 ', and generally, when in an expanded state, the cross-sectional area of the elastic member decreases. The cross-sectional shape of the elastic members 3 ', 3'when they are in a desired stretched state exactly matches the shape of the guide holes 18, 18, ... That is, the elastic members 3', 3'have guide holes 18, 18 .. It is preferable that the guide holes 18, 18 .. are designed so that the gaps that move inside are minimized. In this case, so-called "play" in the guide holes 18, 18 .. It is possible to prevent the elastic members 3 ', 3'from being damped in the curved shape.

However, when the elastic members 3 ', 3'are swung, the expansion ratio of the elastic members 3', 3'is often not always constant, and it is not possible to keep the cross-sectional shape at a constant size. It is difficult to determine the size and shape of the guide holes 18, 18 ...
The elastic member 3 ', so that excessive resistance is not applied to the part,
It is also necessary that the cross-sectional shape of 3'in a low stretched state is a basic condition, and that the joint portion when the elastic members 3 ', 3'are used in addition to be able to pass through the guide holes 18, 18 ... It becomes a condition. Therefore, in practice, it is preferable to design the guide holes 18, 18 ... As small as possible after satisfying the above conditions.

Another important thing is that the elastic member 3 ',
The oscillating shape of 3 ′ is from the position where the elastic members 3 ′, 3 ′ on the oscillating guides 17, 17 are released to the nip roll 19, strictly speaking, as shown by the solid line in FIG. , 18 ... The tip end (hereinafter referred to as the "swing position") to the contact point between one nip roll 19 and the other nip roll 19 (hereinafter referred to as the "nip point") has a large swing shape. It will change. Elastic members 3 ', 3'at this nip point
Are adhesively held to the first and second webs 1 ', 2'. That is, when the composite continuous web 5 is manufactured, since the elastic members 3 ′ and 3 ′ are not rigid bodies but elastic and flexible, the stroke of the reciprocating motion of the swing guides 17 and 17 is attenuated. As a result, the swing shape of the elastic members 3 ', 3'changes.

This damping increases as the distance L from the swing position to the nip point (hereinafter referred to as "introduction distance") increases, and the swing shape of the elastic members 3 ', 3'is designed. It does not match the rocking trajectory. Therefore, it is most preferable that the introduction distance L is 0. However, when the introduction distance L is 0, the elastic members 3 ′, 3 ′ are frequently cut or the swing guides 17, 17 are the first. Also, the adhesive may come into contact with the second webs 1 ′ and 2 ′ and the adhesive may adhere to the swing guides 17 and 17, or the first and second webs 1 ′ and 2 ′ may be torn. Further, since the nip roll 19 has a pressing means and the diameter of the nip roll 19 cannot be set to several mm in order to maintain its rigidity, the nip point between the pair of nip rolls 19, 19 having a certain size of diameter is used. In addition, it is extremely difficult to arrange the rocking positions of the rocking guides 17 and 17 with no space (introduction distance L = 0). Therefore, in practice, it is preferable that the guide holes 18, 18 ... Have a distance relationship that is as close as possible to the extent that the above-mentioned problem does not occur, that is, within 50 mm in the introduction distance L.

Further, as indicated by the broken line in FIG. 2, the surface frictional force of the first web 1'or the second web 2'is utilized (to improve the surface frictional force by the hot-melt adhesive 4 or the like). Of the elastic members 3 ', 3'by contacting the elastic members 3', 3'onto the first web 1'or the second web 2'on the first web 1'or the second web 2 '. It is effective to suppress the rolling in the width direction to suppress the curvilinear damping of the elastic members 3 ′ and 3 ′, and then to convey to the nip point in this temporary holding state. A distance L'from the position where damping by the above method is unlikely to occur, that is, the position where the elastic member reaches the first web and / or the second web on the nip roll to the swing position (also referred to as "introduction distance"). )) Is also preferably within 50 mm, like the introduction distance L.

For such a damping of the curved shape of the elastic members 3 ', 3', the damping degree is calculated from the introduction distances L, L ', and the "play" of the guide holes 18, 18 ... It is particularly effective to make a study and feed back to the design of the above-mentioned rocking mechanism and rocking locus in order to obtain a desired rocking shape and shorten the development period and cost of the device.

More importantly, if the distance between the adjacent elastic members is too small, the adhesive holding force of the elastic members with respect to the sheet member (web) will be reduced. According to this embodiment, each of the first and second elastic members 3'and 3'is composed of three elastic members. Elastic member 3 ',
It was found that the adhesive holding force of 3'is influenced by whether or not the first web 1'and the second web 2'are bonded by the hot melt adhesive 4 on both sides of one elastic member 3 '. . When the distance between the three adjacent elastic members 3 ', 3' ... Is small, both sides of the elastic members 3 ', 3' ... Can be fixed by the first web 1'and the second web 2 '. However, the adhesive holding force of the elastic members 3 ′, 3 ′ ... Therefore, the intervals between the guide holes 18, 18 ... Are determined so that the intervals between the elastic members 3 ', 3' ...

As the material of the elastic members 3 ', 3', a material that does not break when the rocking guides 17 and 17 reciprocate is used. The guide holes 18, 18 of the rocking guides 17, 17 are used. • should be designed to minimize frictional resistance, and those with a smooth surface finish or members with a small coefficient of friction are used. The first web 1'may be a sheet-shaped member, and preferably, a film, a woven fabric, a non-woven fabric, a porous film, a laminated film, or the like is used, and the second web 2'can also be the first web 1 '. The same as' is used. As the adhesive, one basically composed of a base polymer, a tackifier and a softening agent is used, and not only a hot melt type adhesive but also cold crew, solvent type and other adhesives can be used. As the hot-melt adhesive 4, a known adhesive can be used, and a rubber-based or olefin-based base polymer is generally used.

FIG. 3 shows a flat type disposable diaper 10 which is an embodiment of an absorbent article manufactured by using the method of the present invention.
1 is shown. Flat type disposable diaper 101 of the present embodiment
Is composed of an absorber portion 103 and an outer layer portion 102. The absorbent body portion 103 is a so-called hourglass type absorbent body 105 capable of accommodating and holding a liquid-permeable surface sheet 104 and excrement, and the absorbent body 105 is configured to be wrapped in the surface sheet 104. At least three solid gathers (not shown) that can stand upright in the plane of the disposable diaper 101 are symmetrically attached to the absorbent body portion 103 on both sides of the longitudinal centerline 112 of the diaper. It is preferable. As the surface sheet 104,
Woven cloth, non-woven cloth, porous film and the like are used. The absorbent body 105 is preferably composed of defibrated pulp as a main material and a high-molecular water-absorbing polymer together. Moreover, in order to suppress polymer leakage, these are covered with a mount.

The outer layer portion 102 produced by the method of the present invention as defined in claims 1 to 6 is a liquid impermeable back sheet 106, a soft top sheet 107, leg gathers 108A and 108B, and waist gathers 10.
9, having a fastening tape 110 and a waist sheet 111. The waist sheet 111 is provided to cover the ends of the absorber. The outer layer portion 102 includes a top sheet 107, a back sheet 106, and leg gathers 10.
8A and 108B are integrated as a composite member.
That is, this composite member is obtained by the method of the present invention, and the first web = top sheet 107, the second web = back sheet 106, the first elastic member = leg gather 108A,
The second elastic member corresponds to the leg gather 108B.

The leg gathers 108A and 108B are adhered to each other only by hot melt type adhesives at the places where the stretchable property is required. The composite member is processed by flowing members such as the top sheet 107, the back sheet 106, and the leg gathers 108A and 108B in the direction of the vertical centerline 112 of the disposable diaper. The leg gathers 108A and 108B (elastic members) are continuously supplied, but when the disposable diapers 101 are separated from the continuous web state into individual disposable diapers 101,
It is divided in the non-adhesive region, relaxes in the region, and only the necessary region is adhesively fixed in a stretchable state. The leg gathers 108A and 108B are the disposable diapers 101.
The reason why they are attached symmetrically with respect to the vertical centerline 112 is that the left and right legs are brought into close contact with each other to exert a uniform tightening force on the left and right. Then, the outer layer portion 102 is formed by cutting unnecessary portions or additionally attaching some elements to the composite member, and the absorber portion 103 formed in a separate step with respect to the outer layer portion 102. Are joined together to obtain the disposable diaper 101.

As the leg gathers 108A and 108B and the waist gathers 109, those similar to the above-mentioned first and second elastic members 3'and 3'are used. Top sheet 107, back sheet 106 and waist sheet 1
As 11, a woven fabric, a non-woven fabric, a film or the like is used. The fastening tape 110 is generally attached to both sides of the back side of the wearer of the disposable diaper, and is worn by adhering to the ventral side when worn,
Materials such as paper, cellophane, acetate film, cloth, polypropylene, polyethylene, polyethylene terephthalate, and non-woven fabric are used as the base material, and the base material combined with an adhesive is used.

FIG. 4 shows another embodiment of the absorbent article similarly manufactured by the method of the present invention. Since the materials used are the same as those described above, detailed description will be omitted. Flat type disposable diaper 121 of the present embodiment
Has a liquid-permeable top sheet 122, a liquid-impermeable back sheet 123, an absorbent body 124, leg gathers 125A and 125B, and waist gathers 126 disposed therebetween, and leg gathers 125A and 125A.
As B, a tape-like elastic member is used for the disposable diaper 121.
Are arranged symmetrically with respect to the vertical center line 128 of the.

The disposable diaper 121 manufactured by the method of the present invention has a first web = top sheet 122 and a second web.
Web = back sheet 123, first elastic member = leg gather 125A, second elastic member = leg gather 125
B corresponds to each, and the absorber 124 is the top sheet 12
2 and the back sheet 123 are intermittently supplied and bonded and fixed at the time of bonding. In this embodiment, it is preferable to apply a hot melt adhesive to each of the top sheet 122 and the back sheet 123 to fix the absorber 124.

FIG. 5 is a pants-type diaper 14 which is another embodiment of the absorbent article similarly manufactured by the method of the present invention.
1 is shown. In FIG. 5, the pants-type diaper 141 is shown as a developed plan view in which a side joint portion is torn and developed. The pants-type diaper 141 of the present embodiment has a back side portion 150, a crotch portion 151 and an abdominal side portion 152, and is folded in two so that the top sheet 144 is on the inside at the fold virtual line 153, and the seal portion is formed. 154A and 1
By joining 55A, 154B and 155B, a pants-like shape is exhibited. Girth gather 147,
148 is provided for the purpose of preventing the pants-type diaper 141 from slipping off and improving fit.

The pants-type diaper 141 includes an absorbent body 143,
Top sheet 144, back sheet 145, leg gathers 146A, 146B, waist gathers 147, 14
8 and waist gather 149. Crotch 151
The top sheet 144 and the back sheet 145 in
It is cut out so as to form the recessed portions 157, 157. The top sheet 144 is formed to be longer in the longitudinal direction than the back sheet 145, and the waist gather 14 is formed.
9 is fixed by folding the extending portion of the long-formed top sheet 144 inward.

Claim 1 for the pants-type diaper 141
The top sheet 144 =
First web, back sheet 145 = second web, leg gathers 146A = first elastic member, leg gathers 14
6B = second elastic member, and further, as a third elastic member, a waistline gather 147 is swing-bonded between the top sheet 144 and the back sheet 145, and before the top sheet 144 and the back sheet 145 are joined. Absorber 1
43 is interposed. Swinging the waistline gather 147 as the third elastic member as shown in the figure is more effective in preventing the displacement drop.

The leg gathers 146A are arranged from the abdominal side portion 152 to the crotch portion 151, and the leg gathers 146B are arranged from the back side portion 150 to the crotch portion 151.
The leg gathers 146A and 146B are symmetrically arranged with respect to the vertical center line 156 of the pants-type diaper 141, and are partially arranged in parallel with each other in the crotch portion 151. In this embodiment, the top sheet 144, the back sheet 145, the leg gathers 146A and 146B,
Waist gathers 147, 148 and waist gathers 1
49 is continuously flowed in the direction of the horizontal center line 153, and the absorber 1
43 is interposed, and the topsheet 144 is folded in two at the lateral centerline 153 so that the seal portions 154A and 155A, 154B and 155B are sealed, and cut individually at the center of the seal portion. Is manufactured. In this way, the method of the present invention makes it possible to manufacture any absorbent article having various swing shapes.

[0039]

According to the method of swing-bonding an elastic member according to the present invention, it is possible to easily obtain the swing shape of an arbitrary elastic member without causing a bonding error due to the dropping of the adhesive to be coated. it can. Since the elastic member and the web are continuous, continuous production is possible. By suppressing the load on the rocking guide, high-speed production can be supported and a reliable rocking shape can be obtained. Since there is no place where the adhesive adheres and grows, the frequency of maintenance of the swing bonding device for the elastic member is low. Due to these advantages, it is extremely effective in increasing the speed of manufacturing equipment, improving the operating rate, and reducing the defective rate.

[Brief description of drawings]

FIG. 1 is a perspective view of a swing bonding device for an elastic member according to an embodiment of the method of the present invention.

FIG. 2 is an enlarged side view of the vicinity of a nip roll of this embodiment.

FIG. 3 is a partially cutaway plan view of a disposable flat diaper, which is an example, manufactured by the method of the present invention.

FIG. 4 is a partially cutaway plan view of another embodiment of a disposable flat type diaper manufactured by the method of the present invention.

FIG. 5 is a partially cutaway developed plan view of another embodiment of a disposable pants-type diaper manufactured by the method of the present invention.

[Explanation of symbols]

 1'First Web 2'Second Web 3'Elastic Member 4 Hot Melt Adhesive 15 Swing Part 16 Swing Mechanism 17 Swing Guide 18 Guide Hole 19 Nip Roll

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Claims (9)

[Claims] 1. A method of fixing an elastic member on a continuous web with an adhesive, wherein an adhesive is applied to one or both of the surfaces of a continuous first web and a continuous second web to be joined to each other, The first web and / or the second web coated with an adhesive
The web is supplied to the nip roll without bringing the coated surface of the adhesive into contact with other members, and at least one continuous elastic member is forcibly stretched, and the stretched elastic member is placed in front of the nip roll. The first web and the second web are fed between the first web and the second web while being swung by reciprocating with a swing guide in a direction orthogonal to the traveling direction of the first web and the second web, and the elasticity is generated by the nip rolls. The member, the first web, and the second web are pressed to move the elastic member to the first web.
A method for swing-bonding an elastic member, characterized in that the elastic member is bonded and fixed between the web and the second web. 2. The distance from the swing position of the elastic member in the swing guide to the position where the elastic member reaches the first web and / or the second web on the nip roll is within 50 mm. A method for swing-bonding an elastic member according to claim 1. 3. The elastic member is constituted by a pair of a first elastic member and a second elastic member.
A method for swing-bonding an elastic member according to item 1. 4. The method of swing-bonding an elastic member according to claim 1, wherein the elastic member is a plurality of thread rubbers. 5. The first web and the second web are
The method for swing-bonding an elastic member according to any one of claims 1 to 4, which is a non-woven fabric and / or a film. 6. The method of swing-bonding an elastic member according to claim 1, wherein the nip rolls are a pair of rolls, and a pressing means is provided between the pair of rolls. 7. A method of manufacturing an absorbent article, comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber interposed between the sheets, wherein an elastic member is arranged and fixed, A method for manufacturing an absorbent article, comprising using the method for swing-bonding an elastic member according to any one of claims 1 to 6. 8. The elastic member is composed of a pair of a first elastic member and a second elastic member, and a first swing guide and a second swing guide corresponding to each are arranged. A method for manufacturing the absorbent article described. 9. The method for manufacturing an absorbent article according to claim 8, wherein the first elastic member and the second elastic member are symmetrical with respect to a longitudinal centerline of the absorbent article. .