Method and apparatus for thermoforming thermoplastic sheets

Details Method and apparatus for thermoforming thermoplastic sheets Method and apparatus for thermoforming thermoplastic sheets

1997-04-18

1999-01-26

Mackey, James P.

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

Means permitting removal or substitution of elements during...

425397, 425400, 425DIG48, B29C 5126

Patent

active

058635688

ABSTRACT:
A thermoforming machine for thermoforming thermoplastic sheets wherein molding dies are used to apply pressure to a sheet to be thermoformed. A rectangular carriage carries a frame adapted to clamp the peripheral edge of a thermoforming thermoplastic sheet. One side of the frame that is positioned downstream of the carriage is adapted to open so as to have the carriage pass through the molding dies. The carriage is removed from the sheets so as to be pulled back upstream of the molding dies while the operation of the molding dies is carried out for the sheet. The fully pulled back carriage can be used for the following sheet.

REFERENCES:
patent: 3600746 (1971-08-01), Kostur
patent: 3914103 (1975-10-01), Dean et al.
patent: 4097035 (1978-06-01), Shuman
patent: 4666544 (1987-05-01), Whiteside et al.
patent: 4938678 (1990-07-01), Oulman
patent: 5562933 (1996-10-01), Shuman

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