B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/522.5
B29D 23/04 (1980.01) B29C 15/00 (1980.01) B29D 23/03 (1980.01)
Patent
CA 1096116
ABSTRACT OF THE DISCLOSURE In order, in the molding of corrugated thermoplastic tubing, to overcome the disadvantage that pressurized air which is supplied to a zone within the tube of thermoplastic material as it is extruded from an extrusion head into the entrance of a tubular mold tunnel may tend to cause rupturing of the tube at the area immediately adjacent to the extrusion head where the tube is unsupported by the wall of the tubular mold tunnel the pressurized gas is supplied at a low pressure to a first zone within the tube of thermoplastic material to support the tube against the wall of the tunnel, and press- urized gas at a higher pressure is supplied to a second zone within the tube to urge the tube outwardly into the corruga- tions of the tubular mold tunnel. A first sealing arrangement separates the first zone from the second zone which is disposed downstream of the first zone, and a second sealing arrangement defines the downstream end of the second zone.
315660
Lupke Gerd P.h.
Lupke Manfred A.a.
Lupke Gerd P.h.
Lupke Manfred A. A.
Ridout & Maybee Llp
LandOfFree
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