Continuous thermoforming machine

Details Continuous thermoforming machine Continuous thermoforming machine

2005-02-08

2005-02-08

Davis, Robert (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

For press shaping surface

C425S387100, C425S388000, C425SDIG004

Reexamination Certificate

active

06851943

ABSTRACT:
A pressure box for thermoforming a heated sleet of thermoforming material against a mold includes a top plate, side plates, a downstream and plate and an upstream end plate. Each end plate includes a pair of plate members that define a slot open to the bottom of the end plate. A sheet strip of elastomeric material is mechanically held in the slot and extends below the end wall to a seal surface. The seal surface is laser cut to closely conform with the three-dimensional shape of the mold.

REFERENCES:
patent: 3166790 (1965-01-01), Keyes
patent: 3988093 (1976-10-01), Birchenough
patent: 4009981 (1977-03-01), Rosen
patent: 4284396 (1981-08-01), Thissen et al.
patent: 4504205 (1985-03-01), Stofko
patent: 4536148 (1985-08-01), Murley et al.
patent: 404282224 (1992-10-01), None
Edward D. Segen & Co., “Thermoform Tooling, Components, Accessories & Services”, 2nd Edition, p. 13.
General Electric Company, “GE Engineering Thermoplastics Thermoforming Processing Guide”, copyright 2000, 51 pages; p. 27 discusses continuous thermoforming machines.

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