JP2015006934A - Winding core for film winding and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding core which can be easily manufactured at a low cost and has little quality deterioration of a film or the like.SOLUTION: A winding core 1 for film winding where an adhesive agent 2 is applied to a whole outer peripheral surface and a release paper 4 is disposed on a surface of the core 1. A cutting easy part is disposed on the release paper, and a part of the release paper can be easily peeled. The cutting easy part is a perforation or a notch, and the release paper has a shape which can be peeled in a belt-like shape in a longitudinal direction of a paper tube.

Description

  The present invention relates to a film winding core and a method for manufacturing the same.

  In order to wind up a plastic film or a thin sheet, a winding core made of a paper tube or the like is generally used.

  In order to wind up a film or the like, the leading end of the film or the like must be fixed to the core at the start of winding. For this reason, in general, a double-sided adhesive tape is applied to the core, and a film is fixed to the adhesive tape to start winding.

  When a double-sided adhesive tape is affixed and fixed to it and a thin film is wound, a level difference occurs in the portion depending on the thickness of the double-sided adhesive tape, and a film (line) enters the film, and the quality of the film is lowered.

  Further, as described in Patent Document 1 (as a prior art), a method of applying a pressure-sensitive adhesive in a band shape instead of a double-sided adhesive tape has been devised. In this method, a large step is eliminated because a thick double-sided adhesive tape is not used. However, even in this method, since the total of the pressure-sensitive adhesive and the first part of the film is a step, it is still inevitable that the quality of the film is deteriorated.

JP 2005-162468 A

  Therefore, a core that can be easily manufactured at low cost and has little deterioration in quality of a film or the like is provided.

  In view of the above situation, the inventor has completed the film winding core of the present invention and a method for manufacturing the same as a result of intensive research. The adhesive is applied to the surface, and the release paper is provided on the surface. In the manufacturing method, the paper tape is wound around a multi-layer spiral to form a cylinder, and the paper tape is wound around In a continuous process following the process, the adhesive is applied, and then the release paper is continuously applied, and in another aspect, the paper tape is wound around a multi-layer spiral to form a cylindrical shape. In the continuous process following the paper tape winding process, the release paper pre-applied with the adhesive is applied.

  Here, the film may be anything as long as it is in the form of a thin film (generally, a film having a thickness of 100 μm or less, usually 50 μm or less, but is not limited thereto, and any film can be wound. Can be anything). For example, it is a wrap around food or a protective cover film. Of course, not only plastic, but also paper, non-woven fabric, or any other material may be used.

  An adhesive is applied to the entire outer peripheral surface of the core. The pressure-sensitive adhesive may be any type, such as rubber or acrylic. However, the tackiness must last for a certain period of time (at least after application and before winding up the film, at least several months). Those that solidify in a certain time like an adhesive cannot be used.

  Any method may be used for applying the adhesive. When manufacturing by laminating paper in a spiral, the method of applying the adhesive roller in contact with the surface in the last step, the method of applying or spraying in another step after completion of the core, etc. are free. Further, it may be applied by a transfer method. For example, if the transfer sheet which apply | coated the adhesive to the silicon-treated paper is affixed on a core, and a paper is peeled, it is a method in which an adhesive remains on a core.

  With this adhesive, the film is fixed at the start of winding. Therefore, what is necessary is just to determine application | coating thickness, the strength of adhesive force, etc. according to the use.

  A release paper is affixed to the entire surface of the adhesive. This is because of handling problems. This is because if the surface is viscous, not only are various things fixed and soiled, but also the adhesive strength is reduced by moisture or the like. Any release paper may be used as long as it can be peeled off so that the adhesive remains on the core side. Not only paper but also plastic films and sheets may be used. Usually, silicon or fluorine is applied. Of course, the release paper is peeled off during use.

  When the adhesive is placed in the final step of manufacturing the core, the release paper may be applied continuously in subsequent steps. Of course, it may be attached separately. The method of applying may be applied to the spiral as in the manufacture of the spiral paper tube or may be applied in parallel.

  If the release paper is peeled from the entire surface and film winding is started, winding can be started from any part, and the level difference is not doubled. For example, FIG. 5 shows a case where the adhesive 91 is partially applied to the surface of the paper tube 90 as in Patent Document 1 (application thickness is usually 30 to 50 μm). When the film 92 (with a thickness of 50 μm) goes around and overlaps itself, two steps of the pressure-sensitive adhesive layer 91 and the self 92 occur. However, in the case of FIG.

  Further, the release paper may be provided with an easy-to-cut portion so that only a part of the release paper is peeled off instead of peeling it off. This is to prevent a step as much as possible in the winding core. The shape of the release paper to be peeled is usually a band shape, and is a rectangle extending long in the longitudinal direction of the core.

  The easy-to-cut portion is a portion that has been subjected to perforation, cutting, half-cutting, or other processing. Since the perforations are not completely cut, release paper with perforations in advance may be pasted. If it is to be cut completely, stick it and cut it with a cutter like a roller.

  It is basically free to provide the easy-to-cut part, that is, in what place and in which direction the easy-to-cut part is provided. However, it is preferable that the strip can be stripped in the longitudinal direction of the core.

  Further, when the easy-to-cut part is provided, the cutting direction is not vertical, and the release paper to be peeled has an inverted trapezoidal cross section (the cross-sectional direction of the cut is closer to the surface side than the diameter direction of the core) You may cut it so that it spreads as you go). Thereby, the step on the surface of the core is made smaller.

  Further, if the release paper is made into two layers and the two layers are cut so as to have an inverted trapezoidal cross section as in the previous step, the step becomes smaller. In this case, it is necessary to make a cut only on the surface side of the two layers.

  In the core of the present invention, a cushion sheet may be pasted before applying the adhesive. The cushion sheet may be foamed paper or foamed plastic sheet, and the thickness is not limited, but is about 50 μm to 2 mm. When this cushion sheet is provided, when the film or the like is wound up, pressure is applied to the step portion, the cushion sheet is recessed, and the step is eliminated.

  In the production method of the present invention, the adhesive for fixing at the start of film winding is continuously applied by spin coating following the spiral winding of the paper tape for paper tube production, which is not a conventional method. Conventionally, as in Patent Document 1, since it is applied in a strip shape, it is impossible to apply continuously in a spiral shape.

  Furthermore, a release paper is also continuously pasted thereon. Previously, this was also a band, so it could not be attached to the spiral.

  As another method, there is a method in which a release paper pre-applied with an adhesive is continuously pasted in a spiral. This is simpler than the above-described method because an adhesive application step is unnecessary.

The present invention has the following effects.
(1) Since the adhesive is applied over the entire circumference, there are few steps that can be formed at the beginning of winding of the film.
(2) Since the adhesive is applied to the entire circumference (entire surface), there is a film that winds up in the groove of the abutting portion between the spiral tapes on the outermost surface of the paper tube (a slight gap occurs even in the abutting). There is little entering. This is because the entire surface is adhesively fixed and the groove is filled with an adhesive.
(3) When the release paper is partially peeled, the level difference generated is reduced.
(4) The present core can be used multiple times.
(5) In the manufacturing method of the present invention, since application of adhesive, release paper sticking, and the like are incorporated after the manufacturing process of the core, there is a great difference in time and cost from normal spiral paper tube manufacturing. There is no.
(6) The method of applying a release paper pre-applied with an adhesive is easy to manufacture and very convenient.
(7) If the thickness of the release paper to be applied is adjusted according to the thickness of the film to be wound, the level difference becomes smaller.

It is a perspective view which shows one example of this invention core. It is a perspective view (a cross-sectional part is abbreviate | omitted) which shows an example of this invention core. FIG. 3 is a cross-sectional view of a state where only the belt-like portion 6 of the release paper 4 of the core of FIG. FIG. 3 is a partial cross-sectional view of a state where an adhesive 2 is applied to a winding core 1 and a release paper 4 is pasted thereon. It is a fragmentary sectional view which shows the conventional winding core. It is a fragmentary sectional view which shows the example of this invention.

  Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings.

  FIG. 1 is a perspective view showing an example of a core (in this case, a paper tube) 1 of the present invention (thickness is partially exaggerated; the same applies hereinafter). The adhesive 2 has been applied to the entire surface, and the plastic film 3 has just started to be wound. The release paper that has already been applied to the entire surface is peeled off.

  FIG. 2 is a perspective view (a cross-sectional portion is omitted) showing an example of a core in which an adhesive is applied to the entire surface and a release paper is pasted thereon. The release paper 4 is provided with a cut 5 as an easy-to-cut portion. The release paper is completely cut, not half cut. Therefore, only this belt-like portion 6 can be easily peeled off.

FIG. 3 is a cross-sectional view of a state where only the belt-like portion 6 of the release paper 4 of the core shown in FIG. 2 is peeled off and the film 3 is started to be wound around the adhesive 2 exposed at that portion. The leading end of the film 3 is a portion fixed to the peeled groove-like portion of the release paper 4, and is a portion that goes around once and overlaps itself again. No matter where it is taken, there are very few steps, and there is no double step as shown in FIG.
Molding of a film by a step (a line is inserted) does not enter one layer of the film, but because the film is thin, it enters many layers, so the amount of quality deterioration is large. If it is made like this FIG. 3, it will hardly exist.

  As can be seen from this figure, if the release paper 4 and the film 3 have the same thickness, it can be seen that the difference in level is small.

  FIG. 4 is a partial cross-sectional view of the pressure sensitive adhesive 2 applied to the paper tube 1 and another release paper 4 applied thereto. As is apparent from the cross-sectional view of the release paper 4, the easy-to-cut portion of the release paper 4 is cut in a shape that opens upward (the same applies to the perforation). This means that “the cross-sectional direction of the cut is formed so as to expand toward the surface side of the diameter direction of the paper tube”.

  If the release paper 4 shown in FIG. 4 is used, even if the thickness of the remaining release paper 4 is the same, the level difference becomes smooth and the film is hardly damaged. The method for forming this easy-to-cut portion requires only a slight tilting of the direction of the blade such as a cutter, and there is almost no change in labor and cost.

1 Core (paper tube)
2 Adhesive 3 Film 4 Release paper 5 Easy-to-cut part 6 Band-shaped part 90 Core (paper tube)
91 Adhesive 92 Film

Claims (9)

A film winding core, wherein an adhesive is applied to the entire outer peripheral surface, and a release paper is provided on the surface. The film winding core according to claim 1, wherein the release paper has a structure in which an easy-to-cut portion is provided and a part of the release paper can be easily peeled off. The film winding core according to claim 1 or 2, wherein the easy-to-cut portion is a perforation or a notch, and the release paper has a shape that can be peeled in a strip shape in the longitudinal direction of the paper tube. 4. The cutting easy part according to claim 1, wherein the easy-to-cut portion is a notch, and the cross-sectional direction of the notch is formed so as to expand toward the surface side from the diameter direction of the paper tube. The core for film winding as described. 3. The film winding core according to claim 2, wherein the release paper has two or more layers. 6. The film winding core according to claim 5, wherein the easy-to-cut portion is provided so that the surface layer side of the release paper has a wider width that can be peeled off by the easy-to-cut portion. The film winding core according to claim 6, wherein the easy-to-cut portion is a notch, and the cross-sectional direction of the notch is formed so as to expand toward the surface side of the diameter direction of the paper tube. . A method of manufacturing by winding paper tape around a multi-layer spiral to form a cylinder, and in a continuous process following the paper tape winding process, an adhesive is applied to the surface of the cylindrical body, and then the release paper is continuously applied A method for producing a film winding core, characterized by being attached to a film. A method for producing a film by winding a paper tape around a multi-layer spiral into a cylindrical shape, wherein a release paper pre-applied with an adhesive is applied in a continuous process following the paper tape winding process A manufacturing method of a core.

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