METHOD FOR HEAT BONDING OF TAPE PIECE

摘要

PURPOSE:To perform the heat bonding of a tape piece to the outer peripheral surface of the opening end part of a metal cylinder without generating a defect by uniformly heating said opening end part while rotating, by a method wherein the opening end part of the metal cylinder is preheated along the circumferential direction thereof and thereafter locally heated in the upstream of a heat bonding point. CONSTITUTION:The tape piece 20 sucked to the heat bonding part 16a of a bonding roll 16 under vacuum is released from the sucked state at a heat bonding point A' and rotated to the direction shown by an arrow while separated from a heat bonding surface 16a1 to be heat bonded to the outer peripheral surface 3a1 of the opening end part 3a of a lower can body 3 heated to a heat bondable temp. by a high frequency induction heating coil 31 along the entire length thereof under pressure by the cooperation of a heat resistant elastic rubber layer 16a3 and the heat insulating layer 29b of a mandrel 29. The opening end part of said lower can body 3 is uniformly preheated to the temp. near to the lower limit of the heat bondable temp. before the lower can body 3 reaches a heat bonding station A by rotation and locally heated in the part a-b-c before reaching the heat bonding point A' to make it possible to perform heat bonding in such a state that the opening end part 3a is heated in a heat bondable temp. range.