JP2002087654A - Roll of thermoplastic resin sheet and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll and a method of manufacturing the same capable of dispensing with a core material to be disposed of without being accompanied with remarkable cost increase, the failure of a machine or the like. SOLUTION: In this roll 10 on which a thermoplastic resin sheet is wound, at least a part of a side face 12 is fused. The core material such as a paper tube is not used without producing a large amount of waste. The roll can be improved in the recovering, the management of stocks, the cost and the like. The roll does not cause the failure of a machine or the like. According to this method of manufacturing the roll, the roll free from the paper tube can be easily manufactured, and is particularly effective for the roll composed of a buried sign sheet or a protective sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound body formed by winding a thermoplastic resin sheet, and to reduce the number of core materials.

[0002]

2. Description of the Related Art When a woven fabric or a film (hereinafter, referred to as a sheet) made of a thermoplastic resin such as polypropylene is long, it is usually stored, transported, etc. in a state of being wound into a roll. Is made. Such a winding body is formed by winding a sheet several times around a core material such as a paper tube. In this case, even after being wound,
In order to prevent unintentional disengagement from the center of the roll during storage, transfer, or use, the core is kept in place and used for final use. The remaining core material is disposed of.

[0003]

As a result, a large amount of core material must be disposed of as waste, and there is a problem that it takes time to dispose of the core material, and this is not desirable from an environmental point of view. In addition, the cost of the core material itself increases, and there are also difficulties in inventory management because the same number of core materials as the winding body must be prepared in advance. Further, even if the core material used is reused, the paper tube used once has deformation and damage, and is not suitable for reuse. As a substitute for the paper tube, there is also a core material made of resin or the like having excellent durability, but is usually expensive. In addition, the cost of collection and the cost of collection are enormous. Therefore, various rolls without a core material have been studied. JP-A-7-31569
No. 0 discloses a wound body obtained by heat-sealing an end portion at the beginning of winding and a portion wound once to extract a core material. However, if this wound body is provided to an automatic drawer and mechanically pulled out for use, it is difficult to peel off the heat-sealed portion with the rotational force of the rollers of the drawer, which may cause a failure of the drawer. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and does not require a core material to be discarded, and does not cause a significant cost increase or mechanical failure. It is intended for a manufacturing method.

[0005]

The invention according to claim 1 is
In a roll body formed by winding a thermoplastic resin sheet, at least a part of a side surface thereof is fused. Here, the roll may be fused in a linear shape along the radial direction of the side of the roll, and in this case, it is desirable that the roll is fused symmetrically to the center of the side of the roll. It is also desirable that the side surface is fused in a ring shape. The method for producing a roll of a thermoplastic resin sheet according to claim 6,
It is characterized by having a winding step of winding a thermoplastic resin sheet and a fusing step of bringing a hot plate into contact with a side surface of the winding body during or after the winding step. . Here, it is desirable to use a long heat plate and to fuse two or more places on the side surface of the winding body by one contact. It is desirable to use a skein wound shaft for winding. The method for producing a thermoplastic resin sheet roll according to claim 9, wherein the thermoplastic resin sheet is wound around a main shaft and an auxiliary shaft having a smaller diameter than the main shaft. It is characterized by having a winding step, a pre-extraction step of extracting the sub-shaft after the winding, and a post-extraction step of extracting the main shaft after extracting the sub-shaft. INDUSTRIAL APPLICABILITY The present invention is particularly effective for a winding body made of a buried marker sheet or a protective sheet.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] A roll of the present invention is formed by winding a sheet made of a thermoplastic resin.
Various thermoplastic resins, such as polyolefins such as polyethylene and polypropylene, polyesters, and polyvinyl chloride, can be used depending on the application. For example, as shown in FIG.
The fusion part 14 is formed on at least a part of the second part 2. The fused portion 14 may be formed on one side or both sides of the winding body 10. If one side is sufficient, only one side is used. If strong shape retention is required, both sides are used. Is desirably subjected to a fusion treatment. As shown in FIG. 1, this fused portion 14 has only a part of the side surface,
It may be formed on the entire side surface. When the shape retention is required to be high, the requirement is small over the entire surface, and when the drawability is required, partial fusion may be performed. In the case of partial fusion, as shown in the illustrated example, the central through-hole 1
Forming the fused portion 14 around the center 6 is effective for preventing shape collapse from the center. When the fusion is performed only in the vicinity of the center penetrating portion 16 as described above, the width W of the fusion portion 14 is preferably 5 to 50 mm, and most preferably about 30 mm. Further, the application of the fusion process is not limited to the case of forming an annular shape as shown in FIG. For example, as shown in FIG.
8 can also be formed. Also in this case, it is desirable to perform the fusion treatment so as to include at least the layer near the periphery of the central penetration portion 16. In the case where such a linear fusion process is performed, the fusion portion 18 is formed at two locations as shown in FIG. 2 or only at one location or as shown in FIG. It is also preferable to form them at a plurality of places (four places in the illustrated example). However, it is better to fuse them symmetrically with respect to the center of the side surface of the winding body, because not only the balance is good and the durability is high, but also the usability at the time of pulling out is good.

[0007] As described above, in the case of a roll having a fused portion formed on the side surface, the side edges of the respective layers of the sheet are fused to each other. It is possible to prevent the user from unintentionally breaking apart and getting out of shape. In addition, despite the fact that the shape of the wound body is reliably maintained by the fusion, only the side edges are fused in each layer unit. Can be easily peeled off. That is, since only the side edges are fused, the peel strength is usually 300 g or less, so that the sheet can be obtained without any trouble by pulling out from the roll as usual. If the peel strength becomes higher than 300 g and it is difficult to draw out the peel strength, the peel strength can be easily controlled by adjusting the simple welding conditions (for example, the welding temperature and time).

In addition, without departing from the spirit of the present invention,
In order to more reliably maintain the shape from the inside, the innermost layer of the wound body and the outermost layer thereof may be bonded to the extent that they can be peeled off. In such bonding, tapes such as a double-sided adhesive tape and a double-sided adhesive tape, an adhesive, an adhesive, and the like can be applied. For example, "Double-sided paper adhesive tape T-J210", "Double-sided sponge adhesive tape T-280", "Double-sided tape T-CM3" manufactured by KOKUYO Corporation
05 ".

In manufacturing such a roll,
A sheet made of a predetermined thermoplastic resin is wound around a winding shaft (usually about 50 mm) to form a roll. As a wound shaft, a so-called air shaft can be used in addition to a general iron columnar body or a cylindrical body. With an air shaft, the sheet can be wound tightly and tightly by expanding the diameter when winding, and the diameter can be reduced when the roll is finally removed, so it is easy to pull out and manufacture the roll Becomes easier. It is also effective to use an expandable and contractible shaft such as a skein shaft. A skein shaft is a plurality of (usually six) parallel frames provided separately from each other around a central axis and supported and fixed by arms provided radially from both ends of the central axis. After the winding on the frame is completed, the arms are folded so that the umbrella is withdrawn, so that the outer circumference formed by the frame is reduced in diameter, so that the pull-out is facilitated and the production of the wound body is facilitated.

If the fusion process is performed only on the periphery of the central penetrating portion 16 as shown in FIGS. 1 and 3, during or after this winding step, the entire side surface or FIG. If the fusion portion 18 extending over the outer peripheral edge is formed as described above, the fusion process is performed after the winding process is completed. In the case where the fusion step is performed in the middle of the winding step, when the winding is performed at least for the number of layers to be fused, the side surface of the wound body in the middle of the winding is subjected to the fusion treatment, and the winding is restarted again. do it. In the fusing step, a hot plate heated to a temperature at which the sheet can be melted is used, and means for abutting and pressing the hot plate is simple, easy and convenient. As long as the hot plate at least abuts the entire side surface, the hot plate may be larger than the area of the side surface. An annular shape having a shape and size corresponding to 14 or a disk-shaped material may be used as long as the wound shaft does not interfere. In addition, if the fusion process is performed in a linear manner, at least the contact surface may be a long and long linear hot plate. At this time, the fusion process may be performed so that one fusion plate is formed by one thermal plate. However, as shown in FIG.
By contacting the hot plate so that the center of the side surface of the winding body is extended to both sides, it is possible to simultaneously fuse two symmetrical portions with respect to the center of the side surface of the winding body. In this way, by abutting the linear heating plate only once, the two portions sandwiching the central through portion 16 can be fused. However, after the contact is made once, the heating plate or the winding body is removed. By rotating (for example, 90 °) and abutting the hot plate again, four places can be fused together as shown in FIG. Therefore, it is very easy to perform the fusion treatment at many places. FIG. 4 shows an example of a case where a linear fusion process is performed at two places in the vicinity of the center penetrating portion 16 during the winding process. After the fusion process, the sheet is further wound. A winding body is manufactured by extracting the winding shaft 22. The wound shaft can be reused and is not a waste. In this way, after a predetermined amount of winding is performed, and after the fusion process is performed, the wound shaft is pulled out from the central through portion 16,
A roll having no core is manufactured.

The outer peripheral end of the wound body is temporarily fixed with an adhesive tape or the like so as to prevent the sheet from being unraveled, stored, transported, and peeled off at the time of use, and the sheet starts to be pulled out. As shown in FIG. 2, when the fused portion extends to the outer peripheral edge, it is possible to prevent scattering from the outside, so that an adhesive tape or the like for temporary fixing is not required. still,
In the case where the innermost layer of the winding body is bonded to the outermost layer, the winding body may be extracted from the winding shaft, and then the innermost layer may be turned over and attached with an adhesive tape or the like.

Incidentally, in the case of the sheet drawn out of the roll of the present invention, the side edges thereof are peeled off in a fused state, so that they are not necessarily excellent in appearance. In the case of an application requiring the above, a removing step of cutting off the side edge may be added.

[0013] The wound body of the present invention can be used in many applications. Among them, the wound body is generally configured to have a sheet made of a woven fabric, and is used as a buried marker sheet and a protective sheet to be buried underground. Particularly preferred. In particular, in the case of such an application, since a high appearance is not necessarily required, the step of removing the peripheral portion is unnecessary.

[Embodiment 2] A method of manufacturing a roll of a thermoplastic resin sheet according to claim 9 will be described. In this method, as shown in FIG. 5, a sheet made of a thermoplastic resin is wound around a main shaft 26 and a sub shaft 28 as a winding shaft. The material and structure of the main shaft 26 and the sub shaft 28 to be used are as follows. Although a conventionally used shaft such as an iron core can be used, the auxiliary shaft 28
Needs to be thinner than the main shaft 26. For example, if the diameter of the main shaft 26 is approximately 15 mm, the diameter of the sub shaft 28 is approximately half that of 8 mm.
A degree is preferred. The auxiliary shaft 28 is provided adjacent to the periphery of the main shaft 26, and the number of the auxiliary shaft 28 may be one or plural. Then, a thermoplastic resin sheet is wound around the main shaft 26 and the sub shaft 28. A few laps, just starting to wind,
In order to maintain the winding state, stick the adhesive tape 30,
It is desirable to temporarily fix and fix. Then, when the winding is further completed and the predetermined amount is completed, first, the sub shaft 28 is pulled out as a first extraction step. Since the auxiliary shaft 28 has a small diameter, even if the thermoplastic resin sheet is tightly wound with a high tension, it can be extracted relatively easily. Thereafter, the main shaft 26 is pulled out as a post-extraction step. Since the auxiliary shaft 28 has been extracted, the central portion of the winding body 24 has a margin by that amount, so that the main shaft 26 can be easily extracted. In this manner, the wound shaft can be pulled out while tightly winding the thermoplastic resin sheet, so that a wound body without a core material can be easily manufactured. When using this roll, the sheet is pulled out and used, and when the part to be pulled out reaches the place fixed by the adhesive tape, by peeling off the adhesive tape, the sheet can be continuously pulled out and continued to be used . The extracted main shaft 26 and sub shaft 28
Since it can be reused, it is not subject to disposal.
In the above description, the adhesive tape is used, but a means for performing the above-described fusion to the side surface of the wound body during or after the winding step may be employed.

[0015]

The roll of the thermoplastic resin sheet according to the present invention described above does not use a core material such as a paper tube, so that a large amount of waste is not generated. Moreover, it is excellent in terms of collection, inventory management, cost, and the like. Also, there is no mechanical failure or the like. According to the manufacturing method of the present invention, a roll without a paper tube can be easily and easily manufactured. The present invention is particularly effective for a roll made of a buried marker sheet or a protective sheet.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a winding body.

FIG. 2 is a perspective view showing an example of a winding body.

FIG. 3 is a perspective view showing an example of a winding body.

FIG. 4 is a front view showing an example of a fusing method.

FIG. 5 is a perspective view illustrating an example of a method for manufacturing a wound body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Winding body 12 Side surface 14 Fused part 16 Central penetration part 18 Fused part 20 Heat plate 24 Winding body 26 Main shaft 28 Sub shaft 30 Adhesive tape

Claims (10)

[Claims] 1. A wound body in which a thermoplastic resin sheet is wound, wherein at least a part of the side surface is fused. 2. The roll according to claim 1, wherein the roll is fused linearly along a radial direction of a side surface of the roll. 3. The wound body according to claim 2, wherein the wound body is fused symmetrically to the center of the side surface of the wound body. 4. The wound body according to claim 1, wherein the wound body is fused in an annular shape. 5. The winding body according to claim 1, wherein the innermost layer of the winding body and the outermost layer thereof are bonded to each other. 6. A winding step of winding a thermoplastic resin sheet, and a fusing step of bringing a hot plate into contact with a side surface of the winding body during or after the winding step. A method for manufacturing a roll. 7. The method for manufacturing a roll according to claim 6, wherein the hot plate has a long shape, and two or more side surfaces of the roll are fused by one contact. 8. The method according to claim 6, wherein the winding step is performed by using a skewing shaft.
A method for producing the above-mentioned wound body. 9. A winding step of winding a thermoplastic resin sheet around a main shaft and a sub shaft adjacent to the main shaft and having a smaller diameter than the main shaft, and after the winding, extracting the sub shaft. A method for manufacturing a wound body, comprising: a first extraction step; and a subsequent extraction step of extracting a main shaft after extracting a sub shaft. 10. The roll according to claim 1, wherein the thermoplastic resin sheet is an embedded marker sheet or a protective sheet.