PURPOSE: To obtain a thermoshrinkable tube capable of selecting freely contraction coefficient, thickness and length by press welding the edges between the tapes supplied and wound along screw direction on a rotary shaft body one surface of which coated with adhesive, after the flat tape extruded from an extruding machine is drawn.
CONSTITUTION: The flat tape B composed of thermoplastic resin or rubber composition in molten state extruded from the dies 2 of an extruding machine, is pulled down by specified draft ratio or is once made into a sheet by a sheeting roll 8. Then, the drawing treatment with specified magnification in relation to the flowing direction by the speed ratio between the rolls of drawing rolls 9, thereby obtaining an orientated tape B. Next, the tape B is coated with adhesive by coating rolls 10 and then supplied onto a rotating shaft 1 along a screw direction and is wound continuously. Simultaneously, the front edge side of the orientated tape wound later is lapped on the behind edge side of the orientated tape wound formerly, and is press welded by a press roll 11, thereby obtaining the objective tube A with an adhesive layer on the internal peripheral surface at the peripheral surface of the rotating shaft 1.
TORII NAOAKI
HOSHINO NOBUHIKO
HASEGAWA NOBORU
| JPS53121078A | 1978-10-23 |
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