SEPARATELY RECOVERING METHOD FOR STEEL TUBE AND COVERING RESIN OF RESIN-COVERED STEEL TUBE

摘要

PURPOSE:To easily separately recover by heating a resin-covered steel tube to a melting temperature or higher of coating resin by high-frequency induction heating, and scraping it in the state that an inner layer of the resin on a surface of the tube is melted and its outer layer is softened. CONSTITUTION:A resin-coated steel tube 4 becoming a waste in which an outer periphery of the tube is coated with adhesive and covered with thermoplastic resin is fed rightward through a high-frequency induction coil 8 via feed rolls 1, 2 and drawing rolls 3. The coil 8 is connected to a high-frequency induction heater 12 having a high-frequency power source 7 to high-frequency induction heat the tube 4 passed through the coil 8. Separate rolls 5 are installed at positions near the coil 8 at a forward side of the tube 4 in an advancing direction from the coil 8. When an inner layer of the resin on the surface of the heated tube 9 is melted to release its adhesive strength and the outer layer is softened, the resin is scraped from the tube 9 by the rolls 5.