JP2005162468A - Core, winding unit and core using method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of costing much because of released paper attached to a pressure sensitive adhesive for preventing foreign matter such as dust from adhering to a core while keeping stickiness in the case of the core to which the pressure sensitive adhesive is applied. <P>SOLUTION: A holding means for applying material such as starch losing stickiness by drying and again recovering stickiness by application of liquid such as water to a sheet material to keep the sheet material is formed on the surface of the core. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plastic film for magnetic tape, a metal foil such as an aluminum foil, a winding core for winding a sheet material such as paper or a sheet-like filter, a wound body in which the film is wound around the winding core, and The present invention relates to a method of using a winding core. In the present specification and claims, the term “sheet material” is made of metal, paper, synthetic resin, or a composite material thereof, and is sheet-like and has low rigidity and can be wound. Is included.

Conventionally, as a winding core for winding a sheet material, a paper tube or the like that is processed into a cylindrical shape by winding a paper tape 2 in a spiral shape is used as shown in FIG. In order to fix the winding start end of the sheet material 5 to the outer peripheral surface of the core 1, a pressure-sensitive adhesive 4 is applied to the outer peripheral surface of the core 1 in a strip shape in a direction parallel to the axis of the core 1. ing.
By sticking the sheet material 5 to the pressure sensitive adhesive 4 and rotating the core 1, it is possible to quickly and accurately set up the winding of the sheet material 5 on the core 1. Such a configuration is described in, for example, Japanese Patent Publication No. 3-8689.

Japanese Patent Laid-Open No. 3-8689

A conventional winding core for winding a sheet material, to which a pressure sensitive adhesive is applied, is separated from the pressure sensitive adhesive 4 as shown in FIG. 4 until the sheet material 5 shown in FIG. If it is not covered with the pattern paper 6, there is a problem that dust adheres or the adhesive force is reduced due to the influence of moisture, and there is a problem that a process and cost for attaching the release paper 6 are required.
The present invention has been made to solve the above problems, and an object thereof is to reduce the cost by omitting the attachment of a release paper.

The winding core according to the first problem solving means is coated on the surface of the cylindrical body with a holding means in a strip shape parallel to the axial direction of the cylindrical body, and the holding means is dried in the atmosphere and exhibits adhesive strength. The adhesive strength is recovered by applying a liquid without applying the liquid.
The core according to the second problem solving means is the core of the first problem solving means, wherein the holding means is at least one of starch, dextrin, konjac mannan, polyvinyl alcohol, vinyl acetate resin, gum arabic and carboxymethylcellulose. Including one, the liquid being water.
The core by the third problem-solving means is the core of the first problem-solving means, the holding means is ethyl cellulose, and the liquid is ethanol. In any one of the cores of the problem solving means, the cylindrical body is a paper tube.
The wound body according to the fifth problem solving means is obtained by winding a sheet material around one of the first to fourth problem solving means.
According to a sixth problem solving means, the winding means is transported by coating the surface of the cylindrical body with the holding means in a strip shape parallel to the axial direction of the cylindrical body, and the holding means is dried and adhered in the atmosphere. A step of preparing a plurality of cores that recover adhesive force by applying a liquid without exerting a force; a step of bundling a plurality of cores and transporting them so that different core holding means do not contact each other; And a step of attaching the winding core to a winding device, applying a liquid, and sticking the end of the sheet material to the winding core.

According to the core of the first problem solving means, it does not have adhesive force until it is coated with liquid, so it does not require a release paper, saves the trouble of attaching the release paper, and can reduce costs. effective.
According to the winding core of the second problem solving means, there is an effect that the adhesive strength can be recovered with water available anywhere and the handling is easy.
According to the core of the third problem solving means, since ethyl cellulose does not recover its adhesiveness with moisture, there is an effect that it becomes difficult to cause a problem that the holding means adhere to each other during transportation.
According to the winding core of the fourth problem solving means, in the case of a paper tube, the effect of absorbing excess liquid when applying the liquid and shortening the period during which the liquid remains between the film and the winding core can be obtained. is there.
According to the wound body of the fifth problem solving means, since the holding means loses adhesive force when the liquid evaporates, it is possible to prevent the adhesive from adhering to the sheet material when the sheet material is used up to the end. There is an effect.
According to the method for transporting the winding core of the sixth problem solving means, there is an effect that it is possible to prevent the problem that the holding means adheres to each other due to humidity in the atmosphere during transportation.

A winding core according to an embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a perspective view showing a configuration of a paper tube, and FIG. 2 is a perspective view showing a state in which holding means is formed on the paper tube. The paper tube 7A is formed by laminating a plurality of paper tapes 2A wound spirally. Paper is exposed on the surface of the paper tube 7A. The paper tape 2 </ b> A has an abutting portion 3 </ b> A at a boundary portion between a portion wound before one turn and a portion wound after one turn.
As shown in FIG. 2, the core 1A is formed by forming a belt-like holding means 4A on the surface of the paper tube 7A in parallel with the axis of the paper tube 7A which is a cylindrical body.

  The holding means 4A shown in FIG. 2 is formed, for example, by applying a gelatinized starch. For example, 150 g of starch (trade name Piostarch LT manufactured by Nissho Kagaku Co., Ltd.), 100 g of dextrin (trade name Amikol 6L manufactured by Nissho Kagaku Co., Ltd.), vinyl acetate resin Arakawa Chemical Industries, Ltd. (Tamanori G- 37) is added to 250 g and 200 g of water and stirred. The coating material is adjusted by heating the mixture at 85 ° C. or higher for 10 minutes to gelatinize. After the coating material is applied to the surface of the paper tube 7A, the coating material is naturally dried or dried while applying hot air of about 50 ° C to 100 ° C.

  Since the dried starch does not exhibit tackiness, it is not necessary to attach a release paper to the surface of the holding means 4A. Therefore, the cost of the core 1A is reduced compared to the core 1 to which a conventional pressure-sensitive adhesive is applied.

  In transporting the core 1A, the plurality of cores 1A are bundled and wrapped with a stretch film or the like so that dust or the like does not adhere to the core 1A. When bundling a plurality of cores 1A, for example, the positions of the holding means 4A of the core 1A are aligned in the same direction so that the holding means 4A of different cores 1A do not contact each other. By bundling in this way, the holding means 4A of the core 1A can be in contact with the portion of the other core 1A where the paper is exposed, so that it is possible to prevent the holding means 4A from adhering to each other.

When the sheet material 5 as shown in FIG. 3 is wound around the core 1A, when the holding means 4A is moistened by spraying water onto the holding means 4A by spraying or the like, the adhesive force is recovered, and the sheet material is applied to the holding means 4A. Can be pasted. Since excess water attached to the surface of the core 1A is absorbed by the paper tube 7A, the sheet material sticks to the paper tube 7A by the water when the sheet material is wound, and the sheet material is wrinkled. It is hard to happen.
When the sheet material is unwound from the wound body wound around the core 1A, the holding means 4A sticks to the sheet material because the holding means 4A is already dry when the sheet is unwound to the end. The sheet material can be used up to the end.

  In the above embodiment, the case where a mixture of starch, dextrin, and vinyl acetate resin is used as the material of the holding means 4A has been described. A material containing any of these or a combination thereof can be used. These materials also lose their tackiness when dried, and generate adhesive strength when moistened. Although the adhesive force varies depending on the molecular weight, the degree of suspension, etc., since the sheet material ranges from a thin material of several μm to a thick material exceeding 100 μm, the adhesive force is appropriately selected according to the property and shape of the sheet material.

Moreover, in the said embodiment, although the mixture of water-soluble starch, dextrin, and a vinyl acetate type resin was used for the material of the holding | maintenance means 4A, the material which is unnecessary in water and melt | dissolves in a solvent, for example, ethyl cellulose etc. can be used. The material that is unnecessary for water and can be used as a solvent for the holding means 4A is not limited to ethyl cellulose. In this case, the adhesive force can be recovered by spraying a solvent such as alcohol onto the holding means 4A by spraying or the like, and the sheet material can be wound around the core.
In addition to ethyl cellulose, there is one that recovers adhesive strength by spraying toluene into chloroprene rubber or styrene-butadiene rubber. Therefore, such chloroprene rubber or styrene-butadiene rubber can be used for the holding means 4A.

  In the above embodiment, the paper tube 7A is used for the winding core 1A. However, for example, a plastic core may be used. In this case, as compared with the case where the paper tube 7A is used, the liquid remains on the surface, so that it takes time for the liquid to evaporate and the solvent resistance of the plastic is required. Therefore, it is necessary to select the material used for the holding means 4A according to the type of plastic.

It is a perspective view of the paper tube which comprises the winding core of this invention. It is a perspective view of the core by one Embodiment of this invention. It is a perspective view for demonstrating the usage method of the conventional winding core. It is a perspective view which shows the structure of the conventional winding core.

Explanation of symbols

1, 1A winding core, 2, 2A housing, 4, 4A holding means, 5 sheet material, 6 release paper, 7A paper tube.

Claims (6)

A holding means is coated on the surface of the cylindrical body in a strip shape in parallel with the axial direction of the cylindrical body, and the holding means dries in the atmosphere and does not exhibit adhesive force, thereby applying a liquid. A core that recovers adhesive strength. The holding means includes at least one of starch, dextrin, konjac mannan, polyvinyl alcohol, vinyl acetate resin, gum arabic, and carboxymethyl cellulose, and the liquid is water. Item 1. The core according to Item 1. 2. The core according to claim 1, wherein the holding means is ethyl cellulose, and the liquid is ethanol. The core according to any one of claims 1 to 3, wherein the cylindrical body is a paper tube. A wound body obtained by winding a sheet material around the core according to any one of claims 1 to 4. A holding means is coated on the surface of the cylindrical body in a strip shape parallel to the axial direction of the cylindrical body, and the holding means dries in the atmosphere and does not exhibit adhesive force, and applies liquid. Preparing a plurality of cores for recovering the adhesive strength;
Bundling the plurality of cores and transporting them so that the holding means of different cores do not contact each other;
A method of using the core, comprising: attaching the core to a winding device, applying the liquid, and sticking an end of the sheet material to the core.

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