Method of making blow molded plastic articles

Details Method of making blow molded plastic articles Method of making blow molded plastic articles

1975-04-07

1976-11-02

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264 98, 264296, 264327, 425DIG208, 425DIG214, 425DIG215, B29C 1707

Patent

active

039897842

ABSTRACT:
A method of making blown plastic articles of non-circular cross-section, having convex exterior portions, such as a bottle of rectangular or oval shape, or having localized protuberances. The article is blown from a pre-form of inverted shape, i.e., the convex article portions are formed from concave pre-form portions. Also, the concave, pre-form portions are of increased thickness to compensate for their greater subsequent expansion during blowing.
During final blowing, the non-convex portions of the article are first formed against the mold cavity-thereby stabilizing the partly blown pre-form in the blow mold cavity-and the concave pre-form portions are then blown to their final convex shape to complete the article.

REFERENCES:
patent: 2336822 (1943-12-01), Wadman

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