Patent ID: 6979385

Claim:
A method to separate and recover steel pipe and coating resin from resin-coated steel pipe, intended to process a resin-coated steel pipe which consists of steel pipe and coating resin adhered to an outer surface of said pipe, employing a separating and recovering apparatus having a feeding device, a high-frequency induction heating device, a separating mechanism, a take-up device and a recovering device, said feeding device feeding said resin-coated steel pipe of certain length in a running direction thereof thereby passing and heating said resin-coated steel pipe inside or near a high-frequency induction coil of said high-frequency induction heating device, said separating mechanism, which is located at a certain position reached immediately after a heating process separating said coating resin from said steel pipe, said take-up device taking up said steel pipe in said running direction thereof and said recovering device recovering said separated steel pipe and coating resin, characterized in that a cutting means located at a position before said high-frequency induction coil makes incision lines in said coating resin that reach in depth from a surface of said coating resin to said surface of said steel pipe and extend throughout a length of said resin-coated pipe at positions that divide a periphery of said coating resin into at least two parts, that by means of high-frequency induction heating, said steel pipe is heated in such a manner that, when it reaches said separating mechanism located at an appropriate position arrived at immediately after a heating process, a bottom layer of said coating resin adjacent to a boundary of said steel pipe reaches a condition separable from said steel pipe, that said separating mechanism separates said coating resin from said steel pipe and severs said coating resin along said incision lines and away from said steel pipe into at least two pieces and then guides severed pieces of said coating resin in said running direction thereof, and that said recovering device recovers said resin pieces by smashing said resin pieces that are crushed flat in prescribed processes, including a taking-up process by said take-up device.