| 摘要 |
PROBLEM TO BE SOLVED: To improve the adhesive force to a core material, by using a mixed resin of a first thermoplastic resin component made of polyolefin resin and a second thermoplastic resin made of ethylene alkyl acrylate copolymer as a coating material for a core wire with a specified thickness. SOLUTION: A metallic wire or a plastic wire having 0.3-1.2 mm diameter is used for a core wire 3. A durable strength against a plurality of number of twisting movements can be secured and the wire can be easily twisted and untwisted, in the diameter within such a range. A dry-blended material of a first polyolefin resin component and a second thermoplastic resin component (ethylene-alkyl acrylate copolymer or the like) to increase the adhesive force is used as a coating material 2a. In this time, a sufficient adhesive force for the core wire 3 can be obtained by keeping the mixing ratio of the second thermoplastic resin component to the first polyolefin resin component at least at 5%. |
