PRODUCTION UNIT FOR RIBBED THERMOPLASTIC TUBE

摘要

PURPOSE: To improve a seal between a vacuum tunnel and a carrier block by providing a combination of a complementary tongue piece and a groove to obtain an inner passage for communicating molded surface with a suction force from a stationary suction chamber. CONSTITUTION: Each track 81 of a suction chamber 80 is positioned so that each channel 75 of each mold block 16 is automatically engaged with the track 81 when the block 16 starts to travel forward. An upper surface of the track 81 engaged with a groove connector 24 provided on a complementary lower surface of the groove 74 is provided with a tongue piece-like connector 22. In the operation, when a carrier block 46 is engaged with the chamber 80 by engaging the groove 75 with the track 81, the carrier block can be stabilized to rigidly position the connector 22 in the groove 24. Further sensitive and rigid coupling (by engaging the groove 24 with the connector 22) than the coupling performed directly conveniently by the engagement of the groove 75 with the track 81 provides a good seal of the suction between the block 46 and the chamber 80.