JP3175844B2 - Stretch feeding device for elastic members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for extending and supplying an elastic member to a disposable wearing article, and more particularly to a disposable absorbent article such as a disposable diaper, a sanitary article, an incontinence article and the like. TECHNICAL FIELD The present invention relates to a stretching supply device for an elastic member that extends and supplies an elastic member when a stretchable elastic member is attached to an elastic article.

[0002]

2. Description of the Related Art Disposable absorbent articles such as disposable diapers, sanitary articles, incontinence articles, etc. are provided with elastic members at specific locations and stretchable gathers to prevent excretion from leaking. There are many things. In the stretching of the elastic member in such a disposable absorbent article, the gather for the leg is attached by extending the elastic member along the flow direction of the web, and the waist is substantially orthogonal to the gather for the leg. In the gather, the elastic member is attached in a state of extending in a direction perpendicular to the web flow direction.

As a method of stretching the elastic member in a direction perpendicular to the web flow direction, for example, Japanese Patent Application Laid-Open Nos. 63-317576 and 1-18
There are JP-A-3503 and JP-A-2-13454. Japanese Patent Application Laid-Open No. 63-317576 discloses that using a reversing device equipped with a four-bar linkage, an elastic member is stretched in the flow direction, sucked and held by a reversing head, cut into a predetermined size, and rotated. A technique is disclosed in which an elastic piece is pressed against and adhered to an adherend sheet.

Japanese Patent Application Laid-Open No. 1-183503 discloses that a continuous elastic sheet having a predetermined width is coated with an adhesive in a band shape while leaving one side portion in the width direction, and the both ends are vertically moved by a pair of belts. A technique is disclosed in which the sheet is transported while being stretched in the width direction while maintaining a predetermined interval, and adhered to an adherend sheet. JP-A-2-13454 discloses a technique in which a pin extending substantially radially outward is provided on the outer periphery of a wheel, and a pressure roll means is attached to a frame between the wheels to extend an elastic member disposed between the pins. It has been disclosed.

[0005]

However, the technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 63-317576 discloses a technique in which an elastic tape (elastic member) is sucked to thereby maintain the drum in an extended state while maintaining the elastic tape in an extended state. There is a problem that it cannot be applied to a material that cannot be adsorbed, such as an elastic member made of a gas permeable material, because it is adsorbed and supported on the surface.

In the technique described in Japanese Patent Application Laid-Open No. 1-183503, both ends of the elastic member are sandwiched only by the belt, so that the elastic member is not sufficiently held and the accuracy of the bonding position to the web can be obtained. And there is a problem that it cannot be securely attached. JP-A-2-1345
In the method described in Japanese Patent Application Publication No. 4 (1999) -1995, since the holding means of the elastic member is a pin arranged on the wheel, the transfer of the elastic member from the cutter anvil roll to the wheel, the transfer of the elastic member from the wheel to the sheet (web ) Cannot be smoothly transferred. In addition, there is a problem that a device for inserting the elastic member into the pin is required and the device becomes complicated. Furthermore, when an elastic member comes between the pins, it is difficult to hold the pins securely.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an elastic member extending / supplying apparatus which can securely hold and extend an elastic member regardless of its material and has a simple structure. .

[0008]

According to the present invention, there is provided a feed roll for supplying an elastic sheet, a cutter roll for cutting the elastic sheet into elastic members having a predetermined size, and a cutter roll which approaches one side and separates from the other side. Non-parallel, a pair of stretching wheels for stretching the elastic member, and an elastic member provided between the cutter roll and the stretching wheel and cut by the cutter roll on one side of the stretching wheel. In the stretch supply device for an elastic member provided with a transfer roll to be transferred, the transfer roll and the stretch wheel have a holding belt stretched over them in a crossing manner, and the transfer roll is stretched in the transfer roll. The end portion of the elastic member is placed on the holding belt, and the holding belt is stretched on the peripheral surface of the stretching wheel. The object has been achieved by providing a stretching and feeding device for an elastic member, wherein an end of the elastic member is pressed against the peripheral surface of the stretching wheel to hold the elastic member on the peripheral surface of the stretching wheel. Things.

[0009]

According to the elastic member stretching and feeding apparatus of the present invention, the elastic sheet continuously supplied by the feed roll is cut into elastic members of a predetermined size by the cutter roll. After being transferred to a stretching wheel via a transfer roll, the film is stretched by the stretching wheel. At this time, in the transfer roll, the end of the elastic member is placed on the holding belt, and the elastic member is transferred to an adjacent stretching wheel as it is.
When the holding belt is positioned above the elastic member, the holding belt presses the elastic member against the stretching wheel and presses and holds the elastic member on the peripheral surface of the stretching wheel. Stretch.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a first embodiment of the present invention; FIG. An elastic member stretching supply device 1 includes feed rolls 3 and 3 for supplying an elastic sheet 2A, a cutter roll 4 for cutting the elastic sheet 2A into elastic members 2 of a predetermined size, A pair of stretching wheels 5, 5, which extend non-parallel to each other and extend the elastic member, are provided between the cutter roll 4 and the stretching wheels 5, 5, and are cut by the cutter roll 4. A transfer roll 6 for transferring the elastic member 2 to the one side of the stretching wheels 5 and 5, and a holding belt 7 is stretched between the transfer roll 6 and the stretching wheels 5 and 5 by crossing them. The ends 2a, 2a of the elastic member 2 are placed on the holding belt 7 stretched by the transfer roll 6, and the peripheral surface of the stretching wheel 5 Lifting belt 7 is holding the elastic member 2 on the circumferential surface of the stretching wheel 5 against the end 2a of the elastic member 2, the 2a to peripheral surface.

The feed rolls 3, 3 are provided with a pair of upper and lower rolls 3, 3 so as to pinch and transport the continuous elastic sheet 2A, and the elastic sheet 2A pulled out from a raw material (not shown). Is fed to the anvil roll 10 via the guide roll 9 while being given a certain tension. The anvil roll 10 has a pressure reducing area 12 formed on the peripheral surface thereof for sucking and holding the elastic sheet 2A over substantially half the circumference of the roll.

The cutter roll 4 is disposed so as to face the peripheral surface of the anvil roll 10, and the elastic sheet 2A on the peripheral surface of the anvil roll 10 is cut by a cutter 11 provided at a predetermined interval to a predetermined size. The elastic member 2 is formed. In this embodiment, the cutter 11 is a so-called two-cutter, and when a predetermined length of the elastic sheet 2A is supplied, the cutter 11 of the cutter roll 4 meshes with the receiving blade (not shown) of the anvil roll 10. , Elastic sheet 2A
Is cut into elastic members 2 having a predetermined length.
That is, in this embodiment, a pinch cutter method is used.

The transfer roll 6 is provided substantially adjacent to the peripheral surface of the anvil roll 10 described above.
Elastic member 2 cut on the peripheral surface of anvil roll 10
Is to receive. This anvil roll 10
, A pressure reducing region 13 is formed over a half circumference of the roll 10, and a number of holes 6A for suction are formed in the circumferential surface of the roll corresponding to this. The decompression region 13 is connected to a vacuum unit (not shown). Further, a pair of fitting grooves 6B, 6B into which a holding belt 7 to be described later is fitted are formed on both sides of the transfer roll 6 over the entire circumference.

The stretching wheels 5, 5 are not parallel to each other, but are arranged closer to each other on the upper side in FIG. 2 and separated from each other on the lower side.
, An elastic member 2 is stretched over each end portion 2 of the elastic member.
a is held by the holding belts 7, 7 against the surface of the stretching wheel. Further, fitting grooves 5B, 5B into which the holding belts 7, 7 are fitted are formed in each of the stretching wheels 5, 5, and the fitting grooves 5B, 5B are
On the upper side, the fitting groove 6B of the transfer roll 6
The transfer belt 6 is provided in correspondence with the positions of the fitting grooves 6B, 6B of the transfer roll 6 so that the holding belts 7, 7 move continuously from 6B. The pair of stretching wheels 5, 5 are shown in FIG.
As shown in FIG. 5, the shafts 5 are spaced apart from each other, and are obliquely arranged with respect to a direction orthogonal to the conveying direction of the elastic member.
A, 5A, and the distance between the elastic members 2 gradually increases along the transport direction of the elastic member 2. That is, assuming that the distance between the two stretching wheels 5 and 5 at the contact point with the transfer roll 6 is L1, the distance L2 between the two stretching wheels 5 and 5 at the contact point with the roller conveyor 17 for transferring the elastic member 2 is L1. It is getting wider. However, L1 is not always the shortest distance and L2 is not always the longest distance. Note that (L2 / L1) × 100 is the extension rate of the elastic member set by the machine.

Above the stretching wheel 5, there is provided a vacuum unit 15 for sucking and transferring the elastic member 2 placed on the peripheral surface of the transfer roll 6.
This vacuum unit 15 assists the transfer of the elastic member 2 and is not always necessary in the present invention. A pair of holding belts 7 are stretched across the transfer roll 6 and the stretching wheels 5 and 5 in a crossing manner, that is, as shown in FIG. 1, a half circumference of the transfer roll 6 and a half circumference of the stretching wheel are provided. To form an S-shape. The holding belts 7, 7 are wound around tension adjusting rolls 16, 16 to adjust the tension.

The holding belts 7, 7 use endless belts with a slack, and are arranged symmetrically with respect to the center line in the transport direction of the web 19.
Various types of holding belts such as a round belt, a V-belt, and a hexagonal belt can be used. A roller conveyor 17 is disposed below and adjacent to the pair of stretching wheels 5, 5, and after the adhesive is applied by an adhesive applying device 18, the web is stretched on a web (adhered sheet) 19. The latter elastic member is bonded.

Between the pair of stretching wheels 5, a pressing roll 20 is provided at a position where the elastic member 2 is bonded to the web 19.
Are arranged so that the elastic member 2 is pressed against the web on the roller conveyor 17 and adhered at the time of adhesion. The surface of the pressing roll 19 is preferably a liner having silicon rubber lined to show releasability, and has a projection for intermittent pressing. Such a projection is formed in a shape to press only a necessary part.

As the elastic member 2 to be used, not only a gas-permeable material but also any other material can be used as long as it is a sheet-like material having elasticity. Next, the operation of the elastic member stretching supply device according to the present embodiment will be described. The elastic sheet 2A unwound from the material is fed to the anvil roll 10 while being given a certain tension by the feed roll 3.

The elastic sheet 2A sent to the anvil roll 10 is moved in the decompression area 12 of the anvil roll 10
It is adsorbed on the anvil roll 10 and cut by the cutter roll 4 into elastic members 2 of a predetermined size. The elastic member 2 released on the anvil roll 10 from the suction holding is then suction-held on the peripheral surface of the transfer roll 6 by suction in the decompression region 13.

In the transfer roll 6, as shown in FIG. 3, the holding belts 7, 7 are fitted in the fitting grooves 6B, 6B, and the elastic member 2 straddles the pair of fitting grooves 6B, 6B. And is placed on the holding belts 7 by suction.
Next, the elastic member 2 is transferred from the transfer roll 6 to the stretching wheels 5 and 5. At this time, since the holding belt 7 is stretched in a crossing manner, the elastic member 2 The member 2 is transferred to the transfer roll 6. Thereby, the end 2 of the elastic member 2
a, 2a are sandwiched between the holding belts 7, 7 and the fitting grooves 5B, 5B. Thus, the handling of the elastic member is pressed and nipped by the holding belt, and is reliably started. The decompression device 15 may be operated to suction-hold the elastic member 2 on the stretching wheels 5, 5.

The elastic member 2 includes a stretching wheel 5,
5, the film is gradually stretched while moving from the position of contact with the transfer roll 6 to the position of contact with the roller conveyor 17. On the other hand, the web 19 is coated with an adhesive at a predetermined interval by an adhesive coating device 18 and then conveyed to the roller conveyor 17.
9 and the elongated elastic member 2
It is polymerized at the contact point between the stretching wheels 5 and 5 and the roller conveyor 17. At this time, at the polymerization point, the pressing roll 2
0 presses the elastic member 2 against the web 19 and at the same time or immediately thereafter, the holding belts 7, 7 and the stretching wheels 5,
The two side ends 2a, 2a of the elastic member 2 held by the step 5 are released. Thereby, the elastic member 2 is separated from the stretching wheels 5 and 5 and is transferred to the web 19. Therefore, high-speed continuous production is possible by reliable handling of the elastic member 2 in the extended state.

When the elastic member 2 is attached to the web 19, the elastic member 2 is stretched while holding the both sides 2a, 2a, and is released from the grip after being adhered to the web 19. Accuracy and precision of elongation rate control can be improved. As described above, the elastic member 2 is stretched in the width direction of the web 19 and is attached to the web 19 in the stretched state, so that a stretchable gather can be formed on the diaper web 19.

[0023]

According to the elastic member stretching apparatus of the present invention,
The elastic member can be reliably held and extended irrespective of the material of the elastic member, and an elastic member extending / supplying device having a simple structure can be provided. In particular, according to the present invention, when the elastic member is extended, the elastic member is not held by the suction means but by the holding belt and the stretching wheel. Therefore, the elastic member is not limited to the type of the elastic member, and the grip can be released smoothly. High-speed continuous operation is possible.

Further, since the elastic member is extended while being gripped on both sides thereof and adhered to the adherend sheet, it is possible to improve the adhesion accuracy and the accuracy of the elongation rate control.

[Brief description of the drawings]

FIG. 1 is a side view showing the configuration of an elastic member stretching supply device according to the present invention.

FIG. 2 is a front view showing the configuration of the elastic member stretching supply device shown in FIG.

FIG. 3 is a sectional view of a transfer roll.

FIG. 4 is a sectional view of a stretching wheel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stretch supply apparatus of an elastic member 2 Elastic member 3 Feed roll 4 Cutter roll 5 Stretching wheel 6 Transfer roll 7 Holding belt

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61F 13/49 A61F 13/15

Claims (4)

(57) [Claims] 1. A feed roll for supplying an elastic sheet, a cutter roll for cutting the elastic sheet into elastic members of a predetermined size, and a non-parallel arrangement so as to approach each other on one side and separate from each other on the other side. A pair of stretching wheels for stretching the elastic member, and a transfer roll provided between the cutter roll and the stretching wheel, for transferring the elastic member cut by the cutter roll to the one side of the stretching wheel. In the stretching supply device for an elastic member, a holding belt is stretched over the transfer roll and the stretching wheel in such a manner that the transfer roll and the stretching wheel cross each other. In the transfer roll, the elastic belt is stretched on the stretched holding belt. The end of the member is placed, and on the peripheral surface of the stretching wheel, the stretched holding belt extends the end of the elastic member. Stretching feeder of the elastic member, characterized in that for holding the elastic member is pressed against the peripheral surface of Shin wheel stretched wheel circumference. 2. The stretch supply device for an elastic member according to claim 1, wherein a fitting groove into which the stretched holding belt is fitted is formed in the transfer roll and the stretching wheel. . 3. The stretching and feeding device for an elastic member according to claim 1, wherein the transfer roll and the anvil roll are provided with a depressurizing hole formed on a peripheral surface of the transfer roll and the anvil roll for holding the depressurized elastic member. 4. The stretching wheel is provided with a decompression device at a position in contact with the transfer roll, and when the elastic member is transferred from the transfer roll to the stretching wheel, the elastic member is suctioned under reduced pressure. The stretch supply device for an elastic member according to claim 1.