Thermoforming methods and apparatus

Details Thermoforming methods and apparatus Thermoforming methods and apparatus

B - Operations, Transporting

29

C

18/1071

B29C 51/10 (2006.01) B29C 51/22 (2006.01) B29C 51/26 (2006.01)

Patent

CA 1241169

IMPROVEMENTS IN THERMOFORMING METHODS AND APPARATUS ABSTRACT OF THE INVENTION Thermoforming machines with a heating station and a downstream mold station have carrier clamp frames for gripping the edges of sheets of plastic at a load station and indexing them successively to a heating sta- tion and a mold station. The carrier frame members to which the plastic may be releasably clamped carry their own remotely operated clamps and are themselves expand- able and contractible to a condition in which, prior to molding, they control the sag in the sheet formed during heating of the sheets to differential pressure forming temperature. The plastic sheet can be molded to only a portion of a product which functions as a mold member.

461575

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