Process for thermoforming a hollow plastic article using an exte

Details Process for thermoforming a hollow plastic article using an exte Process for thermoforming a hollow plastic article using an exte

1975-06-03

1978-04-18

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264 92, 264 93, 264292, 425388, B29C 1703, B29C 1704

Patent

active

040851770

ABSTRACT:
Process for thermoforming hollow articles having large length to diameter ratios. A male mold assembly having an extendible head portion formed of a porous metal is employed with the male mold being passed through the plane of a heated plastic sheet while a vacuum is drawn through the porous metal head portion to draw the sheet against the male mold. The extendible head portion is extended to increase the depth of the formed article.

REFERENCES:
patent: 688924 (1901-12-01), Blair et al.
patent: 2442338 (1948-06-01), Borkland
patent: 2983955 (1961-05-01), Gajdosik
patent: 2985915 (1961-05-01), Winstead
patent: 3019488 (1962-02-01), Doyle et al.
patent: 3337664 (1967-08-01), Lyon
patent: 3342914 (1967-09-01), Edwards
patent: 3499188 (1970-03-01), Johnson

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