| 摘要 |
PURPOSE:To contrive to improve forming efficiency of the heat shrinkable tube by a method wherein the flat tape discharged from a flat die is supplied to a rotational shaft body and heat shrinkable tube is prepared by overlap-joining of the tape wrapped front and rear. CONSTITUTION:Tape B discharged from the die 2 of an extruder and stretched is supplied to the peripheral surface of the rotational shaft body 1 along a spiral direction and formed by a sheeting roll 8 in a tape form while it is wrapped about the rotational shaft body 1. Then, the tape B is stretched 2-8 times in the flowing direction by the speed ratio between stretching rolls 9 kept at the temperature necessary for stretching. Then, the tape B is heated by a preheating roll 10, etc. up to the most suitable temperature for welding, taken off, supplied about the peripheral surface of the rotational shaft body 1, wrapped continuously. At the same time, the front and rear sides of the tape wrapped later are overlapped on the upper surface of the rear edge side at least of the tape wrapped earlier and this overlapped portion is bonded by a pressure roll 11. Thus, the tape B is formed continuously, cylindrically, moldably on the peripheral surface of the rotational shaft body 1 and taken off. |
