Process for thermoforming plastic materials such as pet

Details Process for thermoforming plastic materials such as pet Process for thermoforming plastic materials such as pet

1987-12-07

1989-07-25

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, 264549, 425384, 425388, B29C 5110

Patent

active

048511781

ABSTRACT:
The method for thermoforming articles out of a sheet of plastic material including initially applying a negative pressure to the cavity and a first forming gas to the second side of the sheet facing the male mold section, switching to a second pressurizing gas for a period of time to allow a level of crystallization of the conformed sheet, and flowing a cooling stream of gas against the sheet to arrest further crystallation.

REFERENCES:
patent: 2123552 (1938-07-01), Helwig
patent: 3429854 (1969-02-01), Siggel
patent: 3482281 (1969-12-01), Thiel
patent: 3496143 (1970-02-01), Siggel
patent: 4466845 (1984-08-01), Fortuna
patent: 4552717 (1985-11-01), Murley et al.
patent: 4666394 (1987-05-01), Wakamiya et al.

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