Patent ID: 6368448
Filing Date: 2002-04-09
Classification: B29C,B29K,B29L,F02M,F05C

Abstract:
A method for joining thermoplastic resin molded products together by pressing together joining surfaces of two molded products that are to be joined, with electric resistance wire therebetween, when such thermoplastic resin molded products are to be joined together, and by applying current to heat the electric resistance wire, so that resin around the electric resistance wire is melted and bonded under pressure to join the two molded products, wherein said method for joining thermoplastic resin molded products comprises:a first step in which electric resistance wire is sandwiched between the joining surfaces of two molded products which are to be joined, pressure is applied at a first predetermined pressure, and current of a predetermined value is applied for a predetermined time to the electric resistance wire, so that the resin around the electric resistance wire is melted by the thermal energy produced in the electric resistance wire while the joining surfaces of the two molded products are held apart at a predetermined interval; and a second step in which, following the conclusion of the first step, the current being applied to the electric resistance wire is stopped, and a second predetermined pressure is applied to join the molten resin under pressure, wherein a gapping means for holding apart at a predetermined interval the surfaces of the two molded products which are to be joined is provided in the first step only, and wherein the gapping means is a spacer of predetermined thickness, said spacer being interposed between the two molded products in the first step, and being removed from between the molded products in the second step.