B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/520
B29C 49/04 (2006.01) B29C 49/42 (2006.01)
Patent
CA 1092763
Method for Producing Seamless Tubular Articles Having an Arcuate Portion Along the Tubular Axis Abstract of the Disclosure A method is disclosed for producing seamless tubular articles such as pluming traps and the like which have an arcuate portion along their tubular axis. Mating die members are provided which, when clamped together, define a mold cavity configured to the external shape of the article to be formed. A tubular parison of heated thermoplastic resin is extruded and has an outside diameter less than the outside diameter of the articles. While still pliable, the parsion is bent to the general shape of the article and the die members are clamped about it with at least the bent portion inside the mold cavity. A blow molding duct is introduced into the parsion and pressurized fluid is introduced through the duct to expand the parsion outwardly into contact with the surface of the mold cavity. When the plastic has cooled sufficiently to rigidi?y, the die members are separated and the mold articles is stripped from the mold. Apparatus for performing the method is also disclosed.
256355
Beaton & Corbin Manufacturing Company (the)
Johnson & Hicks
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