Method for producing polyester container

Details Method for producing polyester container Method for producing polyester container

1981-01-30

1983-03-01

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264520, 264521, 264532, 264535, 264235, 264346, B29C 1707

Patent

active

043754422

ABSTRACT:
Spherulites are grown in such sections as neck, neck end, and bottom center or bottom periphery of a hollow bottle-shaped container of biaxially oriented-blow molded polyethylene terephthalate where the resin is not substantially subjected to orientation, thereby to improve the thermal resistance, stiffness and content resistance of such sections to almost the same extent as the biaxially oriented sections of the container such as shoulder and cylindrical sections thereof. The aforesaid sections of the preformed piece before being blow-molded or of the blow-molded container where the resin is not substantially subjected to orientation are first heated at 120.degree.-180.degree. C. for 3-8 minutes and then annealed at room temperatures, with a result that such sections have a spherulite texture of an increased density and are opacified to white or milky white.

REFERENCES:
patent: 3544673 (1970-12-01), Inskeep et al.
patent: 3555135 (1971-01-01), Paul
patent: 3562372 (1971-02-01), Schjeldahl et al.
patent: 3733309 (1973-05-01), Wyeth et al.
patent: 4025594 (1977-05-01), Agrawal
patent: 4039641 (1977-08-01), Collins
patent: 4179488 (1979-12-01), Nishikawa et al.

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