JP6262160B2 - Winding core and manufacturing method of winding core - Google Patents

Description

  The present invention relates to a winding core for winding a high-performance film such as an optical film or a thin film material such as a sheet, and in particular, a winding core that prevents generation of static electricity during winding, and a winding core The present invention relates to a core manufacturing method.

  In order to wind up a high-performance film such as an optical film or a thin film material such as a sheet, a winding core made of fiber reinforced plastic (hereinafter referred to as FRP) is generally used. The winding core is manufactured by winding a fiber in which a core is impregnated with a resin in a cylindrical shape and curing the resin. The core metal is pulled out after the resin is cured.

  Since the winding core is made of a resin which is a non-conductor, static electricity is easily charged when the thin film material is wound. When the static electricity is charged, there arises a problem that the wound thin film material is wrinkled or dust attracted by the static electricity adheres to the thin film material.

  In order to solve this problem caused by static electricity, for example, in Patent Document 1, the surface of a winding core made of FRP composed of a two-layer structure of a first winding layer and a second winding layer (surface of the second winding layer) A conductive layer is formed. This conductive layer is formed by spraying and coating the surface of the second winding layer with a conductive material such as carbon mixed in an epoxy resin. By forming the conductive layer and imparting conductivity to the surface in this manner, it is possible to prevent wrinkles and dust from being attached when the thin film material is wound.

Japanese Patent Publication No. 3-8938

  Since the winding core according to Patent Document 1 is formed by spray coating after the first winding layer and the second winding layer are sequentially cured, many steps are required to manufacture the winding core. There is a problem that the cost tends to increase.

  Then, this invention makes it a subject to provide electroconductivity simply to the surface of a winding core.

  In order to solve the above problems, in the present invention, a first winding layer formed by winding a fiber impregnated with a resin into a cylindrical shape, and a resin material containing a conductive material is wound around the surface of the first winding layer. And a winding core provided with a second winding layer having a smooth surface.

  Thus, by previously mixing a conductive material into the resin material constituting the second winding layer, the second winding layer is formed, and conductivity is imparted to the surface of the winding core, so that electrostatic charging is performed. It is possible to avoid problems such as wrinkles of thin film materials and adhesion of dust caused by the above. In addition, as described in Patent Document 1, a process for forming a conductive layer is not required after the winding core is formed, so that the manufacturing cost can be reduced. The smooth surface as used herein refers to a surface smoothed to the extent that the wound thin film material is not damaged, such as a wound, after the second winding layer is formed and then processed using a processing device such as a lathe. The specific smoothness is appropriately determined according to the type and thickness of the thin film material to be wound.

  In the said structure, it is preferable to make the weight ratio with respect to resin in the said 2nd winding layer of the said electrically-conductive material into the range of 0.5% or more and 1.0% or less.

  By setting the weight ratio of the conductive material within the above range, it is possible to ensure sufficient conductivity to prevent electrostatic charging. When the weight ratio of the conductive material is lower than 0.5%, sufficient conductivity cannot be ensured, and when the weight ratio exceeds 1.0%, the curing time for curing the second winding layer is increased and production is performed. As a result, the smoothness after curing is lowered, and there is a fear that it cannot be used.

  In each of the above configurations, it is preferable that the resin material has a surface mat impregnated with a resin containing a conductive material.

  This surface mat is made by stacking single fibers such as glass fibers and vinylon fibers in a non-directional uniform thickness and using a binder to form a thin sheet. A problem such as popping out does not occur, and a layer excellent in workability can be formed when the resin is impregnated and cured. By using this surface mat, after forming the second winding layer, it is possible to shorten the work time of the surface processing for ensuring the surface smoothness. For this reason, productivity can be improved.

  A winding core according to the present invention includes a step of forming a first winding layer by winding a fiber impregnated with a resin around a core metal, and a resin material containing a conductive material on a surface of the first winding layer. And a step of forming a second winding layer by winding and curing.

  As described above, by previously mixing a conductive material into the resin material constituting the second winding layer, the second winding layer having conductivity can be easily formed on the surface of the winding core. . It is preferable to further add a step of processing the surface of the second winding layer into a smooth surface after the step of forming the second winding layer. By processing into a smooth surface in this way, it is possible to prevent the wound thin film material from being damaged such as scratches.

  In the manufacturing method, the weight ratio of the conductive material to the resin in the second winding layer is preferably in the range of 0.5% to 1.0%.

  As described above, by setting the weight ratio of the conductive material within the above range, it is possible to ensure sufficient conductivity to prevent electrostatic charging without adversely affecting the curability of the resin.

  In each of the above manufacturing methods, it is preferable that the resin material forming the second winding layer is a surface mat impregnated with a resin containing a conductive material.

  As described above, by using the surface mat, after forming the second winding layer, it is possible to shorten the surface processing time for ensuring the surface smoothness.

  In this invention, the first winding layer formed by winding a fiber impregnated with a resin into a cylindrical shape, and the surface of the first winding layer is formed by winding a resin material containing a conductive material, and has a smooth surface. A winding core comprising a second winding layer was constructed.

  Thus, by previously mixing a conductive material into the resin material constituting the second winding layer, the second winding layer is formed, and conductivity is imparted to the surface of the winding core, so that electrostatic charging is performed. It is possible to easily avoid problems such as wrinkles of thin film material and adhesion of dust caused by the above.

The perspective view which notched the part which shows the structure of the winding core which concerns on this invention 1 is a longitudinal sectional view showing a part of the winding core shown in FIG.

  FIG. 1 is a perspective view of a winding core according to the present invention, and FIG. 2 is a partial longitudinal sectional view thereof. The winding core is composed of two layers, a first winding layer 1 and a second winding layer 2, and forms a cylindrical body having a predetermined width. This winding core is used to wind up a high-performance film such as an optical film or a thin film material such as a sheet.

  The first winding layer 1 is formed by winding a fiber impregnated with resin around a core metal A having a predetermined outer diameter in a cylindrical shape. As this resin, for example, a resin generally used for manufacturing an FRP pipe, such as an unsaturated polyester resin or an epoxy resin, can be adopted. Moreover, as a fiber which impregnates resin, a glass long fiber (glass continuous fiber) and a carbon long fiber (carbon continuous fiber) can be used, for example.

  The second winding layer 2 is formed by winding a resin material containing a conductive material around the surface of the first winding layer 1. As the conductive material, powder or fiber of a conductive material such as metal or carbon can be employed. The addition amount of the conductive material is preferably such that the weight ratio to the resin is in the range of 0.5% to 1.0%. This is because by setting the weight ratio within this range, it is possible to ensure sufficient conductivity to prevent electrostatic charge and not to adversely affect the curability of the resin. As this resin material, similarly to the first winding layer 1, an unsaturated polyester resin, an epoxy resin, or the like can be employed. It is preferable to use the same type of resin for the first winding layer 1 and the second winding layer 2 in that high adhesion can be obtained. However, as long as it has a predetermined adhesion strength, different types of the two winding layers 1 and 2 are used. A resin may be employed.

  The surface of the second winding layer 2 is subjected to a cutting process using a processing device such as a lathe. By this cutting process, the shape of the second winding layer 2 can be adjusted to a predetermined cylindrical shape. Furthermore, the smoothness of the surface of the second winding layer 2 can be further enhanced by mechanically polishing the entire second winding layer 2 subsequent to the cutting treatment.

  As the resin material constituting the second winding layer 2, it is preferable that the surface mat is impregnated with a resin containing a conductive material. This surface mat is obtained by stacking single fibers in a non-directional uniform thickness and using a binder to form a thin mat. By using this as a base material impregnated with a resin, this second surface mat is used. After the winding layer 2 is formed, the amount of surface processing work for ensuring the surface smoothness can be reduced. The number of surface mats to be laminated can be appropriately changed according to the desired thickness of the second winding layer 2.

  The winding core according to the present invention is manufactured by the following steps. First, a fiber impregnated with resin is wound around the core A in a cylindrical shape to perform heat treatment. By this heat treatment, curing of the resin is promoted, and the first winding layer 1 is formed. In forming the first winding layer 1, a known method such as a filament winding method (FW method), a sheet winding method, or a tape winding method can be employed. In the first winding layer 1 formed by these methods, the long fibers (continuous fibers) contained in the resin act as reinforcing fibers and exhibit high strength.

  Next, a resin material containing a conductive material is wound around the surface of the first winding layer 1 and cured to form the second winding layer 2. The material constituting the second winding layer 2 is a resin material containing a conductive material, and the conductivity of the second winding layer 2 is ensured by this conductive material. As described above, it is preferable that the amount of the conductive material added is within the range of 0.5% to 1.0% by weight with respect to the resin. Furthermore, it is preferable that the surface mat is impregnated with a resin containing a conductive material as a resin material constituting the second winding layer 2. The core A is extracted when the formation of the second winding layer 2 is completed.

  As described above, instead of sequentially curing the first winding layer 1 and the second winding layer 2, after the fiber impregnated with the resin is wound around the core metal A in a cylindrical shape, the resin is not cured without being cured. The first winding layer 1 and the second winding layer 2 may be simultaneously cured by winding a resin material containing a conductive material on the surface and performing a heat treatment after the winding. Thus, the manufacturing process can be simplified by curing both winding layers 1 and 2 simultaneously.

  It is preferable to further add a step of processing the surface of the second winding layer 2 into a smooth surface after extracting the cored bar A. This is because by processing into a smooth surface in this manner, it is possible to prevent damage such as scratches on the thin film material to be wound. When a surface mat is used as the base material impregnated with the resin, the working time of the step of smoothing the surface can be shortened.

  Here, carbon was employed as the conductive material, and the relationship between the amount of carbon added and the electrical resistance value and surface hardness of the resin material (second winding layer 2) was evaluated. In this evaluation, a simple test was carried out using the flat plate-like second winding layer 2 instead of the actual winding core shape.

(1) Test method A surface mat using glass fiber as a single fiber is impregnated with an unsaturated polyester resin mixed with carbon as a conductive material. 100 mm × 300 mm × 2 mm plate shape was used. The amount of carbon added is 1.0%, 0.75%, 0.5% (Examples 1 to 3), 1.25%, 0.25% (Comparative Example 1) based on the weight ratio with respect to the unsaturated polyester resin. 2) 5 levels (3 samples each) were prepared.

  The electrical resistance value was evaluated by bringing the two electrodes of a resistance meter into contact with the surface of each test specimen with a distance of 20 cm, and measuring the surface resistance between these two points. In this test, the case where the surface resistance between two points is less than 10 MΩ / 20 cm is conductive (indicated as “◯” in Table 1), and the case where it is 10 MΩ / 20 cm or more is not conductive (in Table 1, “ X ”). Moreover, the surface hardness (Barcol hardness) of the test body was measured based on JISK7060. The Barcol hardness was determined to be 30 or more as good (indicated as “◯” in Table 1) and less than 30 as poor (indicated as “x” in Table 1).

(2) Test results Table 1 shows the measurement results of the electrical resistance value and the surface hardness (Barcol hardness). In addition, in Table 1, the measurement result of the highest electrical resistance value and surface hardness was described among three samples of each level. From this measurement result, when the weight ratio of the conductive material to the resin is 0.5% or more, excellent conductivity can be secured, and when the weight ratio is 1.0% or less, the second winding layer 2 is cured to a predetermined hardness and wound. Can function as a take-up core. From these, it can be said that the weight ratio of the conductive material is preferably 0.5% or more and 1.0% or less.

  The winding core and the manufacturing method of the winding core described in each of the above embodiments are merely examples, and as long as the problem of the present invention of simply imparting conductivity to the surface of the winding core can be solved. For example, various conditions such as the type of conductive material, the number of winding layers, the thickness, and the material can be appropriately changed.

1 1st winding layer 2 2nd winding layer A Core

Claims (4)

A first winding layer (1) formed by winding a fiber impregnated with a resin into a cylindrical shape;
A second winding layer (2) having a smooth surface formed by winding a resin material made of an unsaturated polyester resin containing carbon as a conductive material on the surface of the first winding layer (1);
Equipped with a,
A winding core in which the weight ratio of the carbon to the unsaturated polyester resin in the second winding layer (2) is in the range of 0.5% to 1.0% . The winding core according to claim 1 , wherein the resin material forming the second winding layer (2) is obtained by impregnating a surface mat with an unsaturated polyester resin mixed with carbon as a conductive material. A step of forming a first winding layer (1) by winding a fiber impregnated with a resin in a cylindrical shape around a core metal (A);
Winding a resin material made of an unsaturated polyester resin containing carbon as a conductive material on the surface of the first winding layer (1) to form a second winding layer (2);
Equipped with a,
The manufacturing method of the winding core which made the weight ratio with respect to the unsaturated polyester resin in the said 2nd winding layer (2) of the said carbon in the range of 0.5% or more and 1.0% or less . The method for manufacturing a winding core according to claim 3 , wherein the resin material is obtained by impregnating a surface mat with an unsaturated polyester resin mixed with carbon as a conductive material.

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