JP2006007639A - Sealing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new sealing system which realizes a sealing operation on the side (edge face) of a rotator. <P>SOLUTION: The sealing system comprises retaining means 21 and 22 provided on the side of the rotator 2 which is orthogonal with an axial center O around which the rotator 2 rotates, guide means 27 and 31 which guide the retaining means 21 and 22 along a specified trajectory around the axial center O and a sealing means which seals a sheet-like object W retained by the retaining means 21 and 22, moving along the specified trajectory. The retaining means 21 and 22 retain a continuous sheet-like object W when the former reaches a specified introduction position PI, and the guide means 27 and 31 guide the retaining means 21 and 22 upto a position which is slightly downstream from the introduction position PI in such a way that the retaining means 21 and 22 can move linearly in the introduction direction of the sheet-like object W. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sealing system for sealing a worn article or the like.

In worn articles such as disposable pants, the stacked sheets are sealed. Such sealing is generally performed on the outer peripheral surface of the anvil roll (see Patent Document 1).
JP 10-1000025 (0057, FIG. 2)

  However, Patent Document 1 does not disclose anything about sealing on the side surface (end surface) of the rotating body.

  Accordingly, an object of the present invention is to provide a novel sealing system capable of performing sealing on a side surface (end surface) of a rotating body.

  In order to achieve the above object, a sealing system of the present invention includes a plurality of holding means provided on a side surface of a rotating body perpendicular to an axis about which the rotating body rotates, and the holding means around the axis. A guide unit that guides along a predetermined path; and a sealing unit that seals a sheet-like object that is held by the holding unit and moves along the predetermined path, the holding unit including a predetermined introduction When reaching the position, the continuous sheet-like object is held, and the guide means guides the holding means to linearly move in the introduction direction of the sheet-like object to a position slightly downstream of the introduction position. Features.

When each holding means reaches the introduction position, it moves linearly in the introduction direction of the sheet-like material, so that the sheet-like material can be smoothly introduced. On the other hand, after the introduction, the sheet-like material is moved to a predetermined position around the axis. Therefore, the sheet-like object can be conveyed on the side surface of the rotating body. Therefore, the sealing process can be performed on the side surface of the rotating body.
Moreover, by changing the radius of curvature of the locus of the sheet-like material, it is possible to perform sealing processing of sheet-like materials having different sizes with one apparatus. That is, in the case of a small size, the sheet-like material is introduced so that the radius of curvature becomes small, while in the case of a large size, by introducing the sheet-like material so that the radius of curvature becomes large, Sealing of sheet-like materials having different sizes can be performed.

In the present invention, the sheet-like material may be an intermediate product including a plurality of sheets superposed on each other. Moreover, the core of the absorber may be disposed between the plurality of sheet-like materials.
The final product produced by the present invention may be disposable wearing articles such as disposable pants, diapers and sanitary products.

  In the present invention, the holding means may be a means for holding the sheet-like material as well as a means for holding it by suction. However, since the sheet-like material is formed by overlapping a plurality of sheets, a means for sandwiching the sheet-like material is preferable so that the sheets may not be separated or displaced.

As the sealing means, any means for welding sheets such as so-called sonic and heat sealing can be used.
The sealing means may have a function of cutting the sheet-like material at the sealed portion.

  In this invention, the elastic member which provides the tension | tensile_strength along the longitudinal direction of the said sheet-like material is arrange | positioned in the at least one side edge part of the said sheet-like material, and said one side edge part turns into an inner peripheral side. Thus, the sheet-like material may be moved around the axis of the rotating body.

  As described above, when the one side edge portion on which the elastic member for applying tension in the longitudinal direction of the sheet-like material is disposed is moved around the axis of the rotating body, the side edge portion is caused by the tension. , Move while shrinking. Therefore, even if the holding means releases the sheet-like material after cutting the sheet-like material, there is no possibility of rebounding due to the elastic member.

  In particular, the tension of the elastic member of the sheet-like material can be sufficiently relaxed by setting the distance from the holding means to the shaft center to be smaller from the introduction position to the cutting position where the cutting is performed. Therefore, the rebound can be surely prevented.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1 (a), the present sealing device seals (adheres) predetermined portions while cutting a continuous sheet W and manufactures individual products.
In the following description, for example, the case where the present apparatus is used as a disposable pant manufacturing apparatus shown in FIG. 7 will be described as an example.

Disposable pants:
First, prior to the description of the apparatus, the disposable pants will be described.
As shown in FIG. 7, this pant includes front and rear torso portions 1F and 1B that fit the wearer's waist and a crotch portion C that covers the crotch of the wearer. In the crotch portion C, an absorber or the like is disposed.

FIG. 8 shows an intermediate product before being processed into individual pants.
The continuous sheet-like material (intermediate product) W shown in FIG. 8 is folded into two around the crotch portion C and introduced into the sealing device (FIG. 1) in a state where the body portions 1F and 1B are overlapped with each other. The By the sealing device, the sheet-like material W, in the sealing region Ws is sealed target site, together with the sheet to each other is sealed (bonded) to each other, is cut at the cut line C _L to the individual products (pants).

The sheet-like object W may be, for example, an intermediate product including a plurality of sheets superposed on each other. One side edge (hereinafter referred to as “waist side edge”) W1, W1 of the sheet-like object W corresponding to the trunk parts 1F, 1B of the pants is along the longitudinal direction X of the sheet-like object W. A waist elastic member WG for applying tension is disposed. The sheet W is introduced into the sealing device (FIG. 1) in a state of being stretched in the longitudinal direction X. A leg elastic member LG may be disposed in the leg hole LH.
Individual pants and intermediate products before being processed into individual pants can have various configurations known or not known in the art.

Sealing device:
The sheet-like object W shown in FIG. 1A is introduced into the sealing device at the introduction position PI, then sealed and cut, and conveyed downstream from the lead-out position PO.
This system includes a disk-shaped rotating body 2 that is rotated about an axis O by a motor (not shown).
A plurality of holding means 20 are provided on the side surface of the rotating body 2 orthogonal to the axis O.

Holding means 20:
As shown in FIG. 1B, the holding means 20 is formed in a substantially triangular shape, and a holding portion 21 (22) for holding the sheet W is formed on one side thereof.
A slider 20a is provided in the vicinity of the diagonal of the holding portion 21 (22), and a plurality of guide grooves 20b for guiding the slider 20a are formed on the side surface of the rotating body 2. The holding means 20 is attached to the rotating body 2 via the slider 20a. The slider 20 a and the guide groove 20 b constitute guide means for guiding the holding means 20 along a predetermined locus around the rotating body 2. Each guide groove 20b is formed for each holding means 20 along a normal passing through the axis O in FIG.

  As shown by a two-dot chain line in FIG. 1B, the holding means 20 is provided so as to be swingable around the slider 20a. On the other hand, the slider 20a is guided by the guide groove 20b and It can move in the normal direction r.

  The holding means 20 is linearly substantially parallel along the introduction direction of the sheet-like material W from the introduction position PI to at least a position P2 slightly downstream of the introduction position PI where the holding portion 21 (22) holds the sheet-like material W. Moved. Thereafter, until reaching the cutting position PC, the holding means 20 is rotated around the axis O and moved toward the axis O, and the distance from the holding means 20 to the axis O becomes small. On the other hand, the holding means 20 is rotated around the axis O and moved away from the axis O during the period from the movement to the cutting position PC to the lead-out position PO. From 20 to the introduction position PI, 20 rotates around the axis O and returns to the original position.

First holding unit 21:
2 (b) is a front view showing a part of the first holding portion 21, FIG. 2 (a) is a sectional view taken along line IIa-IIa in FIG. 2 (b), and FIG. 2 (c) is in FIG. 2 (b). It is IIc-IIc sectional view taken on the line.
As shown in FIG. 2 (a), the first holding unit 21 includes a holding unit 20 main body and a pair of holding bars 25, and a sheet-like material is provided between the holding unit 20 main body and the holding bar 25. It is possible to hold it with W in between.

An anvil 23 is formed on the surface of the holding means 20. The anvil 23 is formed in the holding means 20 between the portions where the pair of holding bars 25 come into contact.
The first holding portion 21 so as to hold the vicinity of the cutting line C _L of the sheet W, and is provided at a predetermined pitch.

Sealing means:
In this embodiment shown in FIG. 1A, as an example of the sealing means, the ultrasonic horn 11 shown in FIG. 2A is provided at the cutting position PC, and the ultrasonic horn 11 is placed between the anvil 23 and the sheet. The sheet W may be sealed while the cutter W is brought into contact with the anvil 23 to cut the sheet W.

As the ultrasonic horn 11, for example, an ultrasonic horn described in JP-T-10-513128 may be used. The sealing area Ws of the sheet-like object W is heated by the horn 11. As shown in FIG. 3A, for example, a convex seal pattern 12 may be formed on the surface 11 a of the horn 11. Further, instead of forming the seal pattern 12 on the surface 11 a of the horn 11, a seal pattern may be formed on the surface of the anvil 23.
Moreover, the horn 11 may be provided in multiple places. In addition, as a sealing means, what is necessary is just the method which can adhere | attach the sheet-like thing W, For example, what is called a heat seal other than the horn 11 can be used.

  As shown in FIG. 3B, a cutter 13 may be provided on the surface 11a of the horn 11, and cutting may be performed simultaneously with the sealing. The sheet-like article W introduced at the introduction position PI in FIG. 1A is welded and cut at the cutting position PC before reaching the lead-out position PO.

Holding bar 25:
As shown in FIG. 2C, the holding bar 25 is provided so as to be openable and closable around a rotation center 29 provided in the holding block 26, and a follower 28 is provided at one end of the holding bar 25. Is provided. A cam groove 32 for guiding the follower 28 is formed in the base 3. The follower 28 and the cam groove 32 constitute a linear motion cam 36, and the follower 28 is moved substantially parallel to the axis O (FIG. 1B) of the rotating body 2 while being guided by the cam groove 32. As a result, the holding bar 25 is opened and closed.

Second holding unit 22:
4 (b) is a front view showing a part of the second holding portion 22, FIG. 4 (a) is a sectional view taken along the line IVa-IVa in FIG. 4 (b), and FIG. 4 (c) is FIG. It is the IVc-IVc line sectional view in).
As shown in FIG. 4, the 2nd holding | maintenance part 22 is the structure by which the anvil 23 and one holding bar 25 of the 1st holding | maintenance part 21 mentioned above were abbreviate | omitted, and attached | subjected the same code | symbol to the same part or an equivalent part. The description is omitted.

  In addition, as the holding portions 21 and 22, instead of sandwiching the sheet-like material W by the holding bar 25 and the holding means 20 main body, the sheet-like material W is sucked through the suction holes when the sheet-like material W is introduced, and the sheet The sheet W may be held, and suction from the suction hole may be stopped when the sheet W is led out.

Operation of this system:
Next, the operation of this system will be described.
As shown to Fig.1 (a), the sheet-like article W is introduce | transduced so that the waist side edge part W1 may become an inner peripheral side. At the introduction position PI, the holding bar 25 of the holding means 20 is closed and the sheet W is held.

After the introduction, the holding means 20 is linearly substantially translated along the introduction direction of the sheet W from the introduction position PI to a position P2 slightly downstream of the introduction position PI. When the next holding means 20 reaches the introduction position PI, the holding bar 25 of the holding means 20 is closed and the sheet W is held. After the holding means 20 holds the sheet-like object W, the upstream holding means 20 starts rotating around the axis O. The first holding portion 21 holds the vicinity of the cutting line C _L of the sheet W, the second holding portion 22 holds the part between the cutting line C _L and the cutting line C _L.

  Thus, since the sheet-like object W is linearly conveyed from the introduction position PI to the position P2 slightly downstream of the introduction position PI, the sheet-like object W can be smoothly introduced.

Thereafter, the first holding portion 21 is rotated to the cutting position PC, with sealing process is performed in a predetermined seal area Ws of the sheet W on the anvil 23 is cut along the cutting line C _L. As a result, individual pants are generated from the sheet W. Incidentally, in FIG. 1 (a), in a position corresponding to the cutting line C _L, are drawn normal line passing through an axis O.

Here, as described above, the holding means 20 rotates around the axis O and is moved toward the axis O, so that the pitch between the holding means 20 is reduced. As described above, the sheet-like object W is introduced in such a manner that the waist side edge W1 is on the inner peripheral side in a state where the sheet W is stretched in the longitudinal direction X. Therefore, the sheet-like object W is moved while being contracted by the tension of the waist elastic member WG.
Since the tension of the waist elastic member WG can be sufficiently relaxed from the introduction position PI toward the cutting position PC, after the sheet-like object W is cut, the holding portion 21 (22) of the holding means 20 is moved to the sheet-like object W. Even if the hand is released, there is no risk of rebound caused by the waist elastic member WG.

  On the other hand, the holding means 20 is moved in a direction away from the axis O during the period from the cutting position PC to the lead-out position PO. Thereafter, at the lead-out position PO, the holding bar 25 is opened, and the sheet-like object W is conveyed downstream. After the conveyance, the holding means 20 moves toward the introduction position PI to prepare for holding the sheet-like object W.

The processed pants may be dropped or may be transported with a receiving device 3 provided downstream as shown in FIG.
Further, as shown in FIG. 6, by changing the radius of curvature of the locus of the sheet-like object W, the sheet-like object W having different sizes can be sealed with one apparatus.
That is, in the case of a small-sized sheet-like material WS, the sheet-like material WS is introduced at a position near the axis O at the introduction position PI so that the radius of curvature becomes small. On the other hand, in the case of a large-sized sheet-like material WL, it is put in a position away from the axis O so that the radius of curvature becomes large.

  The present invention can be applied to devices for sealing various products such as architectural and medical products and intermediate products in addition to disposable wearing articles.

(A) is a schematic front view which shows one Example of the sealing system of this invention, (b) is a front view which shows the holding means 20 vicinity. It is a plane sectional view, a front view, and a side sectional view showing the vicinity of the first holding part. It is a perspective view which shows the shape of a horn. It is the plane sectional view, front view, and side sectional view showing the neighborhood of the 2nd holding part. It is a schematic front view which shows the modification of a sealing system. It is a schematic front view which shows the injection | throwing-in method of a sheet-like material. It is a perspective view which shows an example of the manufactured goods (disposable pants) manufactured by this system. It is a front view which shows the intermediate goods introduced into this system.

Explanation of symbols

2: Rotating body 11: Ultrasonic horn (sealing means)
20: Holding means 20a: Slider (guide means)
20b: guide groove (guide means)
O: Shaft center PC: Cutting position PI: Introduction position W: Sheet-like material W1: Waist side edge (one side edge)
WG: Elastic waist member X: Longitudinal direction

Claims (4)

A plurality of holding means provided on the side surface of the rotating body orthogonal to the axis of rotation of the rotating body;
Guiding means for guiding the holding means along a predetermined trajectory around the axis;
Sealing means for sealing the sheet-like object held by the holding means and moving along the predetermined locus,
The holding means holds a continuous sheet-like object when it reaches a predetermined introduction position,
The sealing system characterized in that the guide means guides the holding means so as to move linearly in the introduction direction of the sheet-like material to a position slightly downstream of the introduction position. In Claim 1, the elastic member which provides the tension along the longitudinal direction of the sheet-like material is arranged on at least one side edge of the sheet-like material,
The seal system according to claim 1, wherein the sheet-like object is moved around an axis of the rotating body so that the one side edge portion is on an inner peripheral side.   3. The sealing system according to claim 1, wherein the sealing unit has a function of cutting the sealed sheet-like material.   The seal system according to claim 3, wherein the distance from the holding unit to the shaft center is reduced as it goes from the introduction position to a cutting position where the cutting is performed.

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