Verticle thermoforming apparatus

Details Verticle thermoforming apparatus Verticle thermoforming apparatus

1992-10-01

1995-01-31

Bushey, Charles S.

Plastic article or earthenware shaping or treating: apparatus

Preform severing means

Means forming from bulk and downstream severing means

264550, 264553, 425384, 4253871, 425388, 425398, 425437, B29C 5100

Patent

active

053854659

ABSTRACT:
An apparatus for thermoforming plastic sheet material which has a frame and complementary mold halves mounted on the frame for movement toward and away from one another. The apparatus has an indexing means which moves along a vertical path to pull the plastic material through the mold and a clamping means disposed between the mold halves which operates with the mold to clamp the plastic sheet around the edges of the forming tool of one mold half. The indexing means and clamping means operate to reduce sag of the plastic material and improve uniformity of the finished article. Operation of the apparatus is enhanced by the use of air pressure, vacuum and cooling during molding and release.

REFERENCES:
patent: 2974366 (1961-03-01), Bauman
patent: 3578735 (1971-05-01), Holmar et al.
patent: 3673835 (1972-07-01), Arfert
patent: 4423000 (1983-12-01), Teraoka
patent: 4592718 (1986-06-01), Teraoka
patent: 4600376 (1986-07-01), Gillman et al.
patent: 4804565 (1989-02-01), Rast
patent: 4878826 (1989-11-01), Wendt
patent: 4994229 (1991-02-01), Flecknoe-Brown
patent: 5135383 (1992-08-01), Marchesini

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