Plastic article or earthenware shaping or treating: apparatus – With mechanical means forming or expanding pores
Patent
1982-11-26
1984-06-26
Anderson, Philip E.
Plastic article or earthenware shaping or treating: apparatus
With mechanical means forming or expanding pores
249 66R, 249 79, 249158, 249161, 249167, 264 405, 264 406, 264 455, 264 53, 264101, 264DIG10, 425143, 425149, 425406, B29D 2700
Patent
active
044564430
ABSTRACT:
A machine for molding sheets of foamed material includes an upright stationary steam chest having opposing perforated external faces, and a pair of movable assemblies abuttable with the opposite faces of the steam chest to define mold cavities therewith. Each cavity forming assembly includes a mold frame extending normal to a face of the steam chest, and a platen positioned within and coupled to the mold frame. Jackscrews move each mold frame into and out of abutment with the steam chest, and also move each platen relative to its respective mold frame toward and away from the steam chest. A method of molding sheets of foamed material is also disclosed wherein heated polystyrene beads are squeezed by the movable platens to a predetermined thickness to provide a board having the desired dimensions and density.
REFERENCES:
patent: 2041377 (1936-05-01), Schwarz
patent: 2066993 (1937-01-01), McCombs
patent: 2250697 (1941-07-01), Bassett
patent: 2453568 (1948-11-01), Calleia
patent: 3264381 (1966-08-01), Stevens
patent: 4272469 (1981-06-01), Smith
Anderson Philip E.
Design Engineering Service Inc.
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