Manufacturing method of insulated wire

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method in which a good quality insulated wire can be stably manufactured by preventing cuttings (die drool) from occurring at the tip of a molding die during extrusion coating of an insulation coating layer and securing long-term durability of the molding die.SOLUTION: The manufacturing method of the insulated wire related to the present invention is the manufacturing method of the insulated wire in which a conductor and resin composition are inserted into the molding die and the extrusion coating of the insulation coating layer is performed to the outer periphery of the conductor. The molding die is equipped with an amorphous carbon coating film on a surface in contact with at least the resin composition. The amorphous carbon coating film contains nitrogen, and nitrogen is bonded to carbon constituting the amorphous carbon coating film.

Description

technical field [0001] The present invention relates to a technique for manufacturing an insulated wire, and more particularly to a method for manufacturing an insulated wire in which an insulating coating is extruded and coated. Background technique [0002] As a covering material for insulated wires, polyvinyl chloride (PVC) has been widely used in the past, but in recent years, due to the rising trend of environmental protection, the switch to halogen-free insulated wires is progressing. As such a halogen-free insulated wire, for example, an insulated wire having an insulating coating layer in which an environment-friendly flame retardant (metal hydroxide such as magnesium hydroxide or aluminum hydroxide) is added to a polyolefin material is known. [0003] On the other hand, in the manufacture of insulated wires (especially extrusion coating of insulating coatings), there is a problem that residues such as degradation products and decomposition products of coating resins...

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Problems solved by technology

[0003] On the other hand, in the manufacture of insulated wires (especially extrusion coating of insulating coatings), there is a problem that residues such as degradation products and decomposition products of coating resins (sometimes referred to as "eye gum") accumulate during production. On the extrusion surface (outside of the front end) of the molding die, it falls off in some places and adheres to the product, resulting in product defects such as abnormal outer diameter.

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