Method of making a blown plastic container having a multi-axiall

Details Method of making a blown plastic container having a multi-axiall Method of making a blown plastic container having a multi-axiall

1973-11-02

1976-04-06

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264 97, 264 98, 264296, 264312, 425DIG214, 425DIG215, 425DIG216, B29C 1707

Patent

active

039490335

ABSTRACT:
This invention relates to a method of making a blown plastic container having a concave pressure bottom configuration by blowing a pre-form into a container having a flat bottom, then contacting and deforming the flat bottom to reform the flat bottom into the desired pressure bottom configuration. The flat bottom is reformed by blowing, or by mechanical contact, or both blowing and contact, at a temperature conducive to multi-axial orientation to provide a pressure bottom of increased strength. To facilitate the performance of the method utilizing an initial parison formed by free extrusion, the present invention further contemplates smoothing out any pinch flash and distributing it on the bottom of the parison, so that the pinch flash will not interfere with subsequent forming of the bottom of the final container as above described.

REFERENCES:
patent: 2715751 (1955-08-01), Weber
patent: 3278665 (1966-10-01), Harrison
patent: 3754851 (1973-08-01), Reilly et al.
patent: 3757718 (1973-09-01), Johnson
patent: 3764644 (1973-10-01), Robinson
patent: 3819789 (1974-06-01), Parker

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