B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1077
B29C 51/42 (2006.01) F27D 13/00 (2006.01)
Patent
CA 1196760
"APPARATUS AND METHOD FOR HEATING PLASTIC SHEET MATERIAL" ABSTRACT OF THE DISCLOSURE Apparatus is disclosed for heating a plurality of sheets of plastic material between adjacent ones of a plurality of vertically stacked and individually heated platens. The platens are vertically displaceable together and relative to one another, and any two vertically adjacent platens are vertically separable relative to a fixed hori- zontal pass line to facilitate removing a heated plastic sheet from between the platens and introducing a plastic sheet to be heated therebetween. Vertical separation is achieved by latching the upper one of two adjacent platens in a fixed holding position above the pass line and lowering the lower one of the two platens and any other platens of the stack therebeneath to position the upper surface of the lowered platen at the pass line. Sheet discharge and feed mechanisms are then operable respectively to remove a heated sheet from the lower platen and introduce a sheet to be heated onto the lower platen. In a preferred mode of opera- tion, plastic sheets to be heated are sequentially intro- duced between adjacent ones of the platens from the top of the stack to the bottom thereof and are thereafter removed from between the platens in the same sequence, the elapsed time between introduction and removal providing the required soak time for preparing the plastic sheets for a forming or shaping operation such as in a press.
435240
Cobb John F.
Martin John W.
Corporation Whirlpool
Gulf & Western Manufacturing Company
Kirby Eades Gale Baker
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