Apparatus for the production of wound pipe of thermoplastic syntheticmaterial

Abstract

Abstract AN APPARATUS FOR PRODUCING A WOUND PIPE OF THERMOPLASTIC SYNTHETIC RESIN, WHEREIN A PROFILED BAND OF THERMOPLASTIC, HAVING ONE EDGE PROVIDED WITH A TONGUE AND THE /OTHER EDGE THEREOF PROVIDED WITH A BEAD CONTAINING A GROOVE FOR RECEIVING SAID TONGUE, IS WOUND SPIRALLY IN THE SOFTENED CONDITION ABOUT A ROTATING MANDREL WHEREBY THE TONNGUE OF A PRECEDING WINDING LAP IS CONTTINUOUSLY RECEIVED IN THE GROOVE OF THE BEAD OF THE IMMEDIATELY SUBSEQUENT WINDING LAP, COMPRISING A ROTATABLE DRUM MEANS, AT LEAST ONE PRESSURE ROLL ASSOCIATED WITH SAID DRUM MEANS AND A MEANS, PREFERABLY A SERIES OF TAKE-OFF ROLLS, FOR REMOVING THE FINISHED PIPE FROM THE DRUM MEANS, THE PRESSURE ROLL COMPRISES THREE SECTIONAL ROLLS HAVING A CONTOUR WHICH CORRESPONDS TO THE JUNCTION POINT BETWEEN SUCCESSIVE WINDINGS OF THERMOPLASTIC, THE THREE SECTIONAL ROLLS SUBSTANTIALLY COVERING THE JUNCTION POINT. USING THIS DEVICE, A UNIFORM CONTACT PRESSURE AND, THUS, A UNIFORM AND SATISFACTORY WELDING BOND IS ONTAINED BETWEEN THE TONGUE AND GROOVE THERMOPLASTIC WINDINGS.

Inventors

• 👤 F Primessing
• 👤 F Alfter
• 👤 M Wienand
• 👤 K Jensen

Bibliographic Details