Method of an apparatus for deep drawing of thermoplastic foil

Details Method of an apparatus for deep drawing of thermoplastic foil Method of an apparatus for deep drawing of thermoplastic foil

1986-04-15

1988-01-19

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

264553, 4253261, 425451, 425454, 425504, B29C 5120, B29C 5110

Patent

active

047203676

ABSTRACT:
A method of operating a vacuum-forming machine and the machine which operates by this method, in which once the mold halves are closed on the foil webs for vacuum drawing and fusion of the vacuum drawn container halves come together to produce a hollow article, the mold halves move at the velocity of the web to a lower position spaced from the upper position by a distance sufficient to permit cooling of the molded articles. A spring or other force-storing element is stressed during this movement so that when the mold opens at the lower position, it is driven upwardly at a substantially higher velocity to return to the starting position.

REFERENCES:
patent: 3003187 (1961-10-01), Schaich
patent: 3196513 (1965-07-01), Parma
patent: 3238565 (1966-03-01), Jacobs
patent: 3454693 (1969-07-01), Crenshaw
patent: 3543344 (1970-12-01), Hunt
patent: 3552545 (1970-12-01), Overdiep
patent: 3580773 (1971-05-01), Schneider et al.
patent: 3699199 (1972-10-01), Macduff
patent: 4025250 (1977-05-01), MacMillan
patent: 4381276 (1983-04-01), Hegler et al.

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