SHRINKAGE PREVENTING MATERIAL AND RESIN MOLDING USING SAME

摘要

PROBLEM TO BE SOLVED: To improve abrasion resistance and to obtain a good shrinkage preventing effect stably by forming a fusion layer specified with respect to one-directional abrasion load on the outer periphery of a core wire of a metal wire. SOLUTION: This shrinkage preventing material 1 is constituted from a core wire 2 of a metal wire of a circular cross section and a fusion layer 3 of 400-700 gf one-directional abrasion resistant load (JIS C 3003) formed on the outer periphery of the core wire 2. The fusion layer 3 is formed by a process in which a heat-fusion varnish in which a thermoplastic resin is dissolved or dispersed with an additive in a solvent and the viscosity of which is adjusted appropriately is applied on the outer periphery of the core wire 2 and baked into a semi-cured state to obtain the application layer having 400-700 gf in one-directional abrasion resistant load. When a resin to be coated is a polyvinyl chloride resin or a polyamide resin, a polyester resin varnish of about 140 deg.C softening temperature is used preferably as the heat-fusion vanish.