B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/522.5
B29C 47/00 (2006.01) B29C 47/88 (2006.01) B29C 49/00 (2006.01)
Patent
CA 1092764
ABSTRACT OF THE DISCLOSURE In order, in the molding of corrugated thermo- plastic 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 pressurized gas at different, successively higher pressures is supplied to second and third zones within the tube to urge the tube outwardly into the corrugations of the tubular mold tunnel. A gas leakage path between the second and third zones permits leakage from the third to the second zone, the pressure in the second zone being controlled by venting gas therefrom at a controlled rate.
286652
Lupke Gerd P.h.
Lupke Manfred A.a.
Lupke Gerd P.h.
Lupke Manfred A. A.
Ridout & Maybee Llp
LandOfFree
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