Process for preparing biaxially oriented hollow shaped articles

Details Process for preparing biaxially oriented hollow shaped articles Process for preparing biaxially oriented hollow shaped articles

1980-03-04

1983-05-24

Silbaugh, Jan H.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

264523, 264528, 264529, 264530, 264535, 264537, 264540, 215 1C, B29C 1707

Patent

active

043850898

ABSTRACT:
A process for preparing biaxially oriented hollow shaped articles, in particular bottles of thermoplastic material, by biaxial draw- and blow-molding comprises blow-molding a preform and subsequently maintaining the thermoplastic material in close contact with the hot walls of the mold at a temperature which is in the range from about the minimum effective temperature for biaxial orientation of the thermoplastic material to about 40.degree. C. above this temperature for a period of time which is sufficient to partially reduce internal residual stresses in the hollow shaped articles. Following this partial thermo-stabilization, the hollow shaped article preferably is subjected to cooling, whereby the pressure within the article is at least partially maintained or the shaped article is cooled or allowed to shrink and subsequently subjected to a second blow-molding procedure.

REFERENCES:
patent: 3733309 (1973-05-01), Wyeth et al.
patent: 3888961 (1975-06-01), Schonewald
patent: 3970419 (1976-07-01), Valyi
patent: 4039641 (1977-08-01), Collins
patent: 4233022 (1980-11-01), Brady et al.

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