JP2810732B2 - Method and device for attaching elastic body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and an apparatus for attaching an elastic body, more specifically, for example, a method of attaching an elastic body to an adherend made of a sheet-like material such as a disposable diaper or a sanitary article. The present invention relates to a method and an apparatus for mounting an elastic body suitable for mounting.

[Conventional technology]

Conventionally, as a method of attaching an elastic body, for example,
No. 317576 discloses a method of attaching an elastic tape to a sheet-like product such as a diaper.

The above-mentioned elastic tape attaching method is to adsorb and support the elastic tape on the surface of the rotating drum in an extended state, cut it to a predetermined length, and then adhere the elastic tape to the bonded sheet being transported while maintaining the extended state. Is a method for continuously applying the elastic tape.

[Problems to be solved by the invention]

As described above, in the method described in the above-mentioned publication, the elastic tape is sucked to be sucked and supported on the drum surface while maintaining the expanded state of the elastic tape.
Therefore, the above-mentioned publication can be applied only to an elastic tape made of a material capable of exhibiting a suction force of a size required to maintain the stretched state by suction, such as an elastic body made of a breathable material. Had a problem that it could not be applied.

Therefore, an object of the present invention is to provide an elastic body attaching method and an elastic body attaching method capable of securely attaching an elastic body to an adherend in a predetermined extended state regardless of the material thereof. is there.

[Means for solving the problem]

According to the present invention, a continuously supplied elastic body is elongated in its longitudinal direction, and a predetermined position thereof is locked by a locking member to make the elastic body a predetermined expanded state, and the expanded state is maintained. The elastic body is cut to a predetermined length, and the cut elastic body is changed in its direction with respect to its extending direction, and thereafter, the adherend is continuously supplied in a direction parallel to a supply direction of the elastic body. To fix the whole or a part of the elastic body to the adherend except for the locking position of the locking member, and then remove the locking member from the elastic body to obtain an unfixed portion of the elastic body. Alternatively, the above object has been achieved by providing a method of attaching an elastic body, wherein a part of the elastic body is fixed to the adherend.

The present invention also provides the following apparatus suitable for application to the above method.

Supply means for supplying a continuous elastic body in the longitudinal direction thereof, and an adherend to which the elastic body is cut after being cut to a predetermined length is continuously supplied in a direction parallel to the supply direction of the elastic body. A rotation unit provided between the supply unit and the elastic body and the adherend to be supplied, and having a plurality of segments around the periphery that come into contact with the elastic body and then contact the adherend through the elastic body; And a locking member that locks the continuously supplied and extended elastic body and maintains the extended state thereof, and a rotation member of the rotating body. A cutter that cuts the elastic body held in an extended state by the segment to a predetermined length is provided near the path, and the segment holding the elastic body is connected to the segment via the elastic body. At the position that comes into contact with the adherend, the adherend is The first tucker roll and the second tucker roll that press against the segment side where the body is held and fix the elastic body and the adherend are sequentially arranged, and the effective pressing portion of the first tucker roll is It is formed narrower than the fixed width of the elastic body, and the locking of the elastic body by the locking member is completed before the pressing by the first tucker roll is completed and before the pressing by the second tucker roll is started. The segment is supported at the distal end of a support shaft whose end is pivotally supported by a rotation shaft, and is rotatable in a plane direction around the support shaft as an axis. A mounting device for an elastic body, characterized in that:

[Action]

In the present invention, the elastic member is locked by the locking member to form an extended state of the elastic body, and a part of the elastic body is fixed to the adherend while maintaining the extended state. Thereafter, the locking is released, and the unfixed portion or a part of the elastic body is fixed to the adherend, so that the elastic body can be brought into a desired stretched state regardless of the forming material. Thus, it is possible to securely attach to the adherend.

Hereinafter, the method for attaching an elastic body of the present invention will be specifically described based on embodiments.

In the method of the present invention, the elastic body is composed of a single material or a composite material, and a part or all of the elastic material is substantially provided with elasticity. A fixed sheet-like material, a sheet-like material in which an elastic material is adhered to the entire surface of a nonwoven fabric, an elastic sheet such as a nonwoven fabric having elasticity itself, a ribbon having elasticity, and the like can be given.

The adherend is not particularly limited as long as the above-mentioned elastic body is required to be attached to a predetermined position. As a specific example, the absorbent is provided between the top sheet and the back sheet. And a sheet-like material that is an intermediate material of sanitary articles, such as a disposable diaper or the like, which is obtained by laminating and disposing.

The locking member for holding the continuous elastic body in the extended state is not particularly limited as long as it can securely lock a predetermined position of the elastic body. May be formed by a pin or a needle penetrating the elastic body, or may be formed by a hook or a rough surface such as abrasive paper having a tip hooked on the elastic body. The locking member locks the elastic body in the extended state, but the method of forming the expanded state of the elastic body at the time of locking is not particularly limited, and any method may be adopted. Can be.

Further, as a method of cutting the elastic body held in the extended state by the locking member to a predetermined length, a saw blade-shaped knife cutter, a cutter combining a knife and an anvil,
Examples of using various cutters such as a shear cutter, a heat cutter, a water jet cutter, a rotating disk cutter, a rotating fan cutter, and a flat blade knife cutter can be given.

In addition, as a method of fixing the elastic body in the stretched state to the adherend, any fixing method such as pressure-sensitive adhesive, adhesive bonding or heat welding, fusion welding by ultrasonic welding or the like is adopted. be able to.

The means for pressing the adherend at the time of fixing is not particularly limited, and any means having a pressing surface such as a roll or a plane may be used as long as it can be pressed reliably. it can.

Further, in order to fix the elastic body to the adherend, first, all or a part of the elastic body excluding the locking position by the locking member is pressed to perform the first fixing of the above both. It is preferable to fix all or a part of the elastic body located between the locking positions. After the first fixing, the locking member is removed from the elastic body, and the second fixing for fixing all or a part of the unfixed portion is performed.

According to the method of the present invention described in detail above, regardless of the material of the elastic body, the elastic body can be reliably fixed in the extended state by using a locking member suitable for the elastic body. Therefore, desired elasticity can be easily imparted to a predetermined position of the adherend to which the elastic body is fixed. Also, final fixing (second fixing) with the locking member removed from the elastic body
Therefore, the elastic body can be fixed without damaging the adherend.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention which are suitably applied to the method of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing an elastic body attaching device according to one embodiment of the present invention. FIGS. 2 and 3 show a rotating body of the attaching device at the time of locking and unlocking, respectively. FIG. 4 is an enlarged partial side view showing a segment constituting a part of the disposable diaper, and FIG. 4 is a schematic perspective view showing a disposable diaper manufactured by using the elastic body attaching device of the present embodiment, with a part broken away. FIG. 6 and FIG. 6 are both rear views showing the bonding surface of the elastic body attached at the mounting position of the elastic body, and FIG. 7 is a schematic cross-sectional view of the elastic body.

As shown in FIG. 1, the elastic body mounting apparatus according to the present embodiment includes a supply unit (not shown) for a continuous elastic body (elastic body web) 1 and an elastic body cut to a predetermined length. Supply means (not shown) for an adherend (diaper web) 2 to be attached, and provided between the elastic body 1 and the adherend 2 supplied from the above-mentioned respective means. And a rotating body 4 having a plurality of segments 3 around the elastic body 1 and the adherend 2 that can sequentially contact the elastic body 1 and the adherend 2. The segment 3 is supported at the tip of a support shaft 3a,
The end portion is rotatably supported in the direction of the arrow in the figure by being supported by the rotating shaft 3b.

The supply of the elastic body 1 to the rotating body 4 is performed through the feed roll 5 for the segment 3 that has reached the uppermost position by rotation.

The segment 3 of the rotating body 4 is provided with a locking member 7 that locks the elastic body 1 that is continuously supplied and extended, and maintains the extended state. The elastic body 1 is coated with an adhesive on an adhesive surface by an adhesive coating device 6 disposed behind the feed roll 5, and the rotation speed of the segment 3 and the delivery of the feed roll 5. By adjusting the speed, a desired elongation state is formed.

In the vicinity of the rotation path of the rotating body 4 in the rotation direction,
The elastic body 1 held in the segment 3 in an extended state.
A cutter 8 is provided for cutting the piece to a predetermined length.
Further, at the lowest position where the rotating body 4 rotates and the segment 3 holding the elastic body 1 comes into contact with the adherend 2, the adherend 2 is pressed toward the segment 3, and the elastic body 1 is pressed. A first tucker roll 9 and a second tucker roll 9a for pressing and fixing the body 1 and the adherend 2 are sequentially arranged. The effective pressing portion of the first tucker roll 9 is formed narrower than the fixed width of the elastic body. Therefore, even when locking the extreme end position of the fixed width of the elastic body, without bringing the first tucker roll into contact with the locking member,
The first fixing can be performed.

Further, the locking by the locking member 7 with respect to the elastic member 3 is completed when the pressing by the first tucker roll is completed.
The release is performed before the next press by the second tucker roll is started.

Therefore, the locking of the elastic body 1 by the locking member is started when the segment 3 reaches the uppermost position or its vicinity, and is released when the segment 3 reaches the lowermost position or its vicinity. FIG. 2 and FIG. 3 specifically show this relationship.

That is, for ease of understanding, a part of the elastic body 1 is shown broken, but FIG. 2 shows a state in which the elastic body 1 in the extended state is locked by the locking member 7 and held on the surface of the segment 3. Is shown. The locking member 7 is formed of a needle-like claw inserted symmetrically from the back through the inside of the segment 3 from the back to the front. The tip of the locking member is advanced to protrude from the surface of the segment 3. By doing so, the above-mentioned lock is made, and as shown in FIG. 3, the above-mentioned lock is released by retreating the above-mentioned tip and positioning it inside the surface of the segment 3.

The forward and backward movement of the locking member 7 is enabled through a cam mechanism and a link mechanism interlocked with the cam mechanism as shown. If the cam follower 12 moves around the fulcrum 13 by the fixed cam 11, the link will be described.
A cam attached to the spindle 3a of the segment 3 via 14
15 is rotated, and the advancing and retreating operation of the locking member 7 is performed through the operation of the cam follower 16 interlocked therewith.

Further, the advance / retreat operation of the locking member 7 is synchronized with the rotation of the segments 3 so that each segment 3 is reliably performed at the predetermined position.

In the present embodiment, the segment 3 is rotatable about the support shaft 3a at right angles in both directions, that is, to a position perpendicular to the rotation direction.

The rotation of the segment 3 up to the vertical is performed by cutting the elastic body 1 with a cutter 8 and then rotating the first tucker roll 9.
, And rotate back to the original position before passing through the position of the second tucker roll 9 and contacting the elastic body 1 again at the uppermost position. It has been done.

In the present embodiment, the rotation of the segment 3 in the direction of the arrow is in principle approached to the uppermost position, and the interval between the adjacent segments 3 is reduced. When the cutting of the elastic body 1 by the cutter 8 is completed, the acceleration is accelerated. The interval between the segments 3 is widened, so that the elastic body 1 can be fixed to the adherend 2 at a predetermined pitch.

Next, the operation of the present embodiment will be specifically described with reference to the production of a disposable diaper shown in FIG. 4 as an example. The disposable diaper generally has a laminated sheet structure in which an absorber 23 of a predetermined size is arranged between a back sheet 21 and a top sheet 22, and an elastic body 1a forming a three-dimensional gather is provided at a waist position.
And 1b are fixed, and the fastener tape 24
Is attached.

The adherend 2 continuously supplied is in a state where the elastic bodies 1a and 1b extending in the direction indicated by the imaginary line in FIG. 4 are not attached.

On the other hand, the continuously supplied elastic body 1 is made of a nonwoven fabric having a shape extending in the direction indicated by the imaginary line in FIG. 5, and as shown in the cross-sectional view of FIG. An elastic material (indicated by black dots) is continuously arranged in the longitudinal direction at both ends thereof, and elasticity is imparted by the elastic material. Is what it is.

The supplied elastic body 1 passes through the feed roll 5,
After the adhesive is applied to the bonding surface by the application device 6, the adhesive is rotated and comes into contact with the segment 3 which has reached the uppermost position, and is locked by the locking member 7 as shown in FIG. Will be retained.

The elastic body 1 held in the extended state includes the segment 3
Are cut perpendicularly to the rotation direction of the segment 3 by the cutter 8 sequentially at the front position and the rear position, and cut into an elastic body A having a predetermined length as shown in FIGS. 5 and 6. .

The segment 3 holding the elastic body A having the predetermined length,
Rotate in the direction of the arrow while rotating to the right angle position in the plane direction,
At the lowest position, it contacts the adherend 2 in a direction perpendicular to the rotation direction. Then, the elastic body A is fixed to the adherend 2 in the contact state. At this time, first, a portion hatched in FIG. First, the fixing of the locking member 7 is released as shown in FIG. 3, and then the second tucker roll 9 is fixed.
Unfixed portion (remaining portion) shown in FIG. 7 by hatching
Is fixed (second fixation).

The above operation is sequentially performed for each subsequent segment 3, whereby the adherend 2 having a continuous shape in which the elastic body A is fixed at a predetermined pitch is formed. The adherend to which the elastic body A is fixed is formed by forming the elastic body A (elastic body) on a continuous sheet-like object as shown by a virtual line in FIG. 4 for convenience.
1b and the elastic body 1a are continuous), but are fixed at a predetermined pitch.

In the next step (not shown), the adherend 2 is sequentially placed at an intermediate position of the elastic body A in order to form a state in which the elastic bodies 1a and 1b are fixed as shown in FIG. It is cut to form a disposable diaper in which the elastic bodies 1a and 1b shown in the figure are alternately fixed. The cutting position corresponds to the BB line position shown in FIGS. 5 to 7 in the case of the elastic body A.

As described above, according to the present embodiment, regardless of the material of the elastic body, it is possible to easily manufacture a disposable diaper in which the elastic bodies 1a and 1b constituting the three-dimensional gather are fixed at predetermined positions, and The fixing of the elastic body A is performed in a two-stage fixation consisting of a first fixation excluding the position where the engaging member is engaged and a second fixation performed after the engaging member is removed, so that the non-water permeable material is fixed. The elastic body A can be fixed after reliably preventing the back sheet 21 from being damaged.

Although the present invention has been described in detail, it goes without saying that the present invention can be variously modified without departing from the gist thereof.

For example, although the needle-shaped claws as the locking members are shown symmetrically arranged at two positions, the number of claws provided at each position can be arbitrarily changed according to the width of the elastic body to be locked. It is.

Further, the locking member is not limited to the needle-shaped claw, and may be used without limitation as long as it can appropriately lock and release the elastic body, and the locking mechanism is not particularly limited.

Further, in the above-described embodiment, the case where the segment is rotated to the right angle position in the plane direction is described. However, the present invention is not limited to this, and the segment may be rotated to an arbitrary angle as needed. By doing so, regarding the disposable diaper, it is possible to easily and reliably attach the elastic body not only to the waist position but also to any direction such as the length direction of the central portion or the length direction of the leg. Become.

Needless to say, the attachment of the elastic body is not limited to the case where the elastic body is applied to the production of disposable diapers, and accordingly, the elastic body used can be variously changed.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to the attachment method of the elastic body of this invention, an elastic body can be reliably attached to a to-be-adhered body, with a predetermined | prescribed extended state regardless of the material.

Further, the elastic body mounting device of the present invention can easily and reliably mount the elastic body.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an elastic body attaching device according to an embodiment of the present invention, and FIGS. 2 and 3 constitute a rotating body of the attaching device at the time of locking and unlocking, respectively. FIG. 4 is a partial side view showing the segment in an enlarged manner, FIG. 4 is a schematic perspective view showing a partially cutaway disposable diaper for manufacturing the elastic body of this embodiment using a mounting device, and FIG. 5 and FIG. FIG. 7 is a rear view showing a bonding surface of the elastic body attached by the elastic body attaching device, and FIG. 7 is a schematic cross-sectional view of the elastic body. DESCRIPTION OF SYMBOLS 1 ... Elastic body, 2 ... Substrate 3 ... Segment, 3a ... Support shaft 3b ... Rotating shaft 4, ... Rotating body 7 ... Locking member, 8 ... Cutter 9 ... First tucker Roll 9a …… Second tucker roll

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A41B 13/00 A61F 5/44 A61F 13/00

Claims (2)

(57) [Claims] An elastic body continuously supplied is elongated in the longitudinal direction, and a predetermined position thereof is locked by a locking member to bring the elastic body into a predetermined expanded state, and this expanded state is maintained. The elastic body is cut to a predetermined length as it is, and after the cut elastic body is changed in its direction with respect to its extending direction, the adhered body is continuously supplied in a direction parallel to the supply direction of the elastic body. Body, and fix all or a part of the elastic body to the adherend except for the locking position of the locking member. Then, remove the locking member from the elastic body, and fix the elastic body. A method of attaching an elastic body, comprising fixing a part or a part thereof to the adherend. 2. A supply means for supplying a continuous elastic body in the longitudinal direction thereof, and an adherend to which the elastic body is cut after being cut to a predetermined length is moved in a direction parallel to the supply direction of the elastic body. Supply means for continuously supplying, and a plurality of segments disposed between the elastic body and the adherend to be supplied, respectively, the segments being in contact with the elastic body and then contacting the adherend via the elastic body And a rotating member having a periphery thereof, and a locking member for locking the elastic body which is continuously supplied and elongated in the longitudinal direction, and retains the extended state. In the vicinity of the rotation path of the rotating body, a cutter for cutting the elastic body held in an extended state on the segment to a predetermined length is provided, and the segment holding the elastic body is provided. A position in contact with the adherend via the elastic body A first tucker roll and a second tucker roll for pressing the adherend toward the segment where the elastic body is held, and fixing the elastic body and the adherend, are sequentially disposed, The effective pressing portion of the first tucker roll is formed to be narrower than the fixed width of the elastic body, and the locking of the elastic body by the locking member completes the pressing by the first tucker roll, and the second The segment is released before the pressing by the tucker roll is started, and the segment is supported by a tip end of a support shaft whose end portion is supported by the rotating shaft, and the segment is surfaced around the support shaft. An attachment device for an elastic body, which is rotatable in a direction.