B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/517
B29C 49/64 (2006.01) B29C 49/16 (2006.01) B29C 49/06 (2006.01) B29C 49/18 (2006.01)
Patent
CA 1080416
ABSTRACT Production of oriented polyethylene terephthalate containers by injecting a polyethylene terephthalate composition into a first mold chamber defining a parison having an axis substantially defined by a core rod and perimeter defined by the wall of the mold, said parison having a tip, a body and a neck; cooling the exterior wall of the polyethylene terephthalate parison to render the outer wall of the parison dimensionally stable; after the outer wall of the parison is dimensionally stable, transferring the parison, while disposed on the core rod, to a second mold chamber, whereby the distance between the outer wall of the transferred parison and the inner wall of the second mold chamber is at any given point between 2.5 and 150% of the distance across the body of said parison at said point, and wherein the wall of the second chamber is at a higher temperature than the wall of the first chamber which was in contact with the parison tip; when the core rod is at no more than 265°F., injecting a gaseous fluid into the parison at a pressure of at least 10 psig to separate the body of the parison from the core rod and force the exterior wall of the body of the parison to assume the shape of the wall of the second chamber; transferring the parison, while the neck of the parison is disposed on the core rod, to a third chamber, whereby the distance between the outer wall of the trans- ferred parison and the inner wall of the third chamber is at any given point at least 50% of the distance across the body of said parison at said point; and at the orientation temperature of the polyethylene terephthalate parison, injecting a gaseous fluid into the parison to force the exterior walls of the body of the parison to assume the shape of the wall of the third chamber and to orient the walls of the body of the parison.
237294
Na
Standard Oil Company
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