JP2005075521A - Core and roll-like material using the core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core, preventing a step at the starting end of roll from being transferred to a long material such as a film and repeatedly used. <P>SOLUTION: In this core, a recessed part 5 is provided in the longitudinal direction on the surface of the core 1 formed of a cylindrical body and soft resin 6 having stickiness is embedded in the recessed part 5 to be flush with each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a core for winding a long object such as a film into a roll, and a roll using the core, and more specifically, the end at the beginning of winding becomes a step as a step. The present invention relates to a winding core that prevents transfer and can be used repeatedly, and a roll-like product using the winding core.

Conventionally, as shown in FIG. 3 (a), a long object such as a belt-like film is traded as a roll by winding a long object 2 around a paper or plastic core 1 to be used. Has been.
As this type of technology, as shown in FIG. 3 (b), one strip of adhesive (or adhesive) 3 is applied to the surface of the core 1 in the length direction, and the winding start end of the long object 2. 2a is adhered and fixed to the surface of the core 1 by the adhesive 3, and the long object 2 is wound to form a roll.

It has also been proposed to use an adhesive tape having a thickness of 10 μm or less in order to fix the starting end of the plastic film to the core (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 7-6252

  However, in the case of the former method, as shown in FIG. 3 (b), the thickness of the adhesive 3 is added to the thickness of the winding start end portion 2a of the long object 2, so that a step is generated. It is inevitable that this step is transferred as the bending line 4 to the long object 2 wound in a triple manner.

  Although the bent line 4 generated by transferring the step on the long object 2 becomes gradually less noticeable as the long object 2 is wound, the bent line 4 is usually transferred over several tens of meters. For example, if the long object 2 is an optical film that requires a high level of flatness and smoothness, it is not suitable for early use and is discarded. Therefore, the productivity is extremely poor and uneconomical, and there are problems from the viewpoint of effective use of resources and environmental conservation.

  On the other hand, the core is also difficult to use repeatedly because dust and dust adhere to the adhesive and the adhesive fixing force decreases, and it is usually the situation that it must be discarded after one use. Not only is it uneconomical, it also raises problems from the perspective of effective use of resources and environmental conservation.

  Also, it is not easy to apply the adhesive to the surface of the core immediately before winding the long object, and it is not always easy to apply the adhesive in a uniform thickness over the length of the core. In addition, it is extremely difficult to redo and adjust the long object.

  On the other hand, when the latter method is used, the problem in the case of using the above-described adhesive is considerably solved, but it is inevitable that the thickness of the pressure-sensitive adhesive tape is transferred to a long object and a bending line is generated.

  In view of such circumstances, the present invention completely prevents transfer of the step at the winding start end to a long object, and provides a reusable core and a roll using the core. It is.

  That is, claim 1 of the present invention is characterized in that a concave portion is provided in the longitudinal direction on the surface of a cylindrical core, and a soft resin having adhesiveness is embedded in the concave portion in a flush manner. Is the content.

  The second aspect of the present invention includes the core according to the first aspect, wherein the adhesive soft resin is made of urethane resin.

  A third aspect of the present invention includes the core according to the first or second aspect, wherein the adhesiveness is 25 mm wide and the range is 400 to 600 g when peeled at 180 degrees.

  A fourth aspect of the present invention includes the core according to any one of the first to third aspects, in which the recess has a trapezoidal cross section.

  Claim 5 of the present invention is for an optical film, and includes the core according to any one of claims 1 to 4.

  According to a sixth aspect of the present invention, a winding start end portion of a long object is bonded and fixed to the soft resin surface having adhesiveness of the core according to any one of the first to fifth aspects, and the long object winding The roll-like product is characterized in that the winding start end portion is pushed into the recess of the core by elastic deformation of the soft resin due to the tension at the time of winding, and is wound in a state where there is substantially no step. And

In the core of the present invention, a recess is provided in the length direction of the core surface, and a soft resin having adhesiveness is embedded in the recess, so that the step at the winding start end of the long object is long. The soft resin is pressed against the soft resin by the tension at which the scale is wound, and the soft resin elastically deforms substantially by the thickness of the winding start end, thereby substantially absorbing the thickness of the winding start end and bending lines due to the step. Is prevented from being transferred to a long object.
Therefore, long objects can be used to the end without being discarded, and are not only high in productivity and economical, but also enable effective use of resources and environmental conservation.
In addition, it is possible to re-fix and finely adjust the winding start end of the long object, and the workability is greatly improved.

  As the soft resin having adhesiveness, soft urethane resin is preferable, and dust and dust adhering to the surface can be easily removed by washing with water, and the original adhesiveness is restored by drying, so the core is used repeatedly. It is possible and economical.

  The adhesiveness is preferably in the range of about 400 to 600 g, for example, with a width of 25 mm and 180 degree peeling.

  In addition, by embedding a soft resin having adhesiveness with a concave portion as a trapezoidal shape, the tension at the time of winding by winding and fixing the winding start end of a long object to the soft resin by the resistance of the shape It is possible to increase the force to resist.

  The long article wound around the core is particularly suitable for an expensive optical film that requires high flatness and smoothness.

  The core of the present invention is characterized in that a concave portion is provided in the length direction on the surface of a cylindrical core, and a soft resin having adhesiveness is embedded in the concave portion.

  The core in the present invention is a conventional core made of paper, plastic, metal or the like. Examples of the plastic include ABS resins, polyolefin resins such as polyethylene and polypropylene, vinyl chloride resins, polyamide resins, polyester resins, F.I. R. P, thermosetting resins such as phenol resin, metals such as stainless steel, and the like.

  As the soft resin having adhesiveness used in the present invention, the adhesiveness is such that it does not peel against the tension when the winding start end of a long object is adhesively fixed to the surface of the core and mechanically wound. In addition, a soft resin that does not deteriorate the adhesive property even after being washed with water and dried to remove dust and dust and restores the original adhesive property is preferably used. Since the soft urethane resin can be peeled off without damaging the long object by slowly peeling off the long object, there is an advantage that it can be used without discarding the long object until the end.

  The adhesiveness of the soft resin requires that the winding start end portion of the long object is bonded and fixed to the soft resin surface, and the winding start end portion does not peel off due to the tension at the time of winding the long object, The length may be selected as appropriate in consideration of the type of the long object and the tension such as the tension when winding the long object. For example, a range of about 400 to 600 g at 25 mm width and 180 degree peeling may be mentioned. .

  The soft resin having adhesiveness is embedded in a recess provided in the length direction on the surface of the core. It is preferable that the concave portion has a trapezoidal cross section so that the soft resin does not escape due to tension when a long object is wound. You may adhere | attach and embed soft resin which has adhesiveness in a recessed part using an adhesive agent. If the adhesive is used on the side surface, it prevents the soft resin from being elastically deformed by the thickness of the winding start end due to the tension at the time of winding, so it should be used only on the bottom surface. The soft resin having adhesiveness is provided substantially flush with the surface of the core.

  A long object is wound around the above-described winding core. That is, the winding start end portion of the long object is adhered and fixed to the soft resin surface having adhesiveness, and the winding start end portion of the winding core is elastically deformed by the soft resin due to tension at the time of winding the long object. A roll-like material that is pushed into the recess and wound in a substantially level-free state is obtained.

  Although it does not restrict | limit especially as a elongate thing wound around the said core, The high value flatness and smoothness are requested | required in particular, and an optical film (or sheet | seat) which is expensive, and a document whose value falls when a bending line enters. It is suitable for textiles and the like.

  EXAMPLES Hereinafter, although this invention is demonstrated in more detail based on an Example, it cannot be overemphasized that this invention is not limited only to these Examples.

Example 1
As shown in FIG. 1, a paper core 1 having an inner diameter of 7.3 cm, an outer diameter of 8.7 cm, a thickness of 7 mm, and a length of 11 cm is provided with a rectangular recess 5 having a cross-section of 3 mm in length and 6 mm in width to provide adhesiveness. A soft polyurethane was embedded as the soft resin 6 having the same surface as the surface of the core 1. An adhesive (not shown) was used on the bottom surface of the flexible polyurethane.
As the long object 2, the winding start end 2 a of the film was adhered to the soft polyurethane 6 portion of the core 1 and wound. In the wound film 2, there is no bending line where the step of the winding start end 2a is transferred, and the film 2 can be easily peeled off without damaging the winding start end 2a adhered to the soft polyurethane. It was possible to use it over the entire length without discarding, including the winding start end 2a.
Further, when the surface of the soft polyurethane 6 was wiped with a wet cloth, dust and dust were easily removed, the original adhesive force was restored on the dried surface, and the core 1 could be used repeatedly.

Example 2
An ABS resin core was used, the cross section was a trapezoidal recess with an upper base of 7 mm, a lower base of 11 mm, and a height of 3 mm, and the same as in Example 1 except that no adhesive was used.
In the wound film 2, there is no bending line where the step of the winding start end 2a is transferred, and the film 2 can be easily peeled off without damaging the winding start end 2a adhered to the soft polyurethane. It was possible to use it over the entire length without discarding, including the winding start end 2a.
Moreover, when the core was washed in water, dust and dust were easily removed, and after drying, the original adhesive strength was restored and it could be used repeatedly.

  As described above, in the core of the present invention, the step at the winding start end is not transferred as a bending line to a long object such as a film. Therefore, as in the conventional case, the transferred portion is not discarded. Since it is not necessary at all and a long object can be used substantially 100%, not only is it extremely productive and economical, but also effective use of resources and environmental conservation are achieved.

  Also, dust and dust adhering to the soft resin having the core adhesiveness are easily removed by washing with water, and the original adhesiveness is restored by drying, so the core can be used repeatedly and is extremely economical. Rather, effective use of resources and environmental conservation are achieved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a principal part side view which shows the Example of this invention, (a) shows the winding start of a long thing, (b) shows the state by which the level | step difference of a winding start edge part is eliminated by the tension | tensile_strength at the time of winding. It is a principal part side view which shows the other Example of this invention, (a) shows the winding start of a long thing, (b) shows the state by which the level | step difference of a winding start edge part is eliminated by the tension | tensile_strength at the time of winding. Show. (A) is a side view which shows a roll-shaped object, (b) is a side view which shows the state by which the level | step difference of the winding start end part of the conventional long thing is transcribe | transferred to a long thing.

Explanation of symbols

1 Core 2 Long object (film)
2a Winding end of long object 3 Adhesive 4 Bending line transferred by step 5 Recess 6 Soft resin (soft polyurethane)

Claims (6)

  A core having a concave portion provided in a length direction on a surface of a core made of a cylindrical body, and a soft resin having adhesiveness embedded in the concave portion.   The core according to claim 1, wherein the soft resin having adhesiveness is made of a urethane resin.   The core according to claim 1 or 2, wherein the adhesive has a width of 25 mm and a range of 400 to 600 g when peeled at 180 degrees.   The core according to any one of 1 to 3, wherein the recess has a trapezoidal cross section.   It is an object for optical films, The winding core of any one of Claims 1-4. The winding start end portion of the long object is bonded and fixed to the soft resin surface having the adhesiveness of the winding core according to any one of claims 1 to 5, and the winding start is caused by a tension at the time of winding the long object. An end portion is pushed into the concave portion of the core by elastic deformation of the soft resin, and is wound in a state having substantially no step.

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