Plastic article or earthenware shaping or treating: apparatus – Diverse distinct type shaping means – Shaping orifice and either a downstream preform reshaping...
Patent
1992-03-10
1997-03-25
Bushey, C. Scott
Plastic article or earthenware shaping or treating: apparatus
Diverse distinct type shaping means
Shaping orifice and either a downstream preform reshaping...
26417719, 2642105, 425384, 425388, 4254031, B29C 5100
Patent
active
056142285
ABSTRACT:
Apparatus for producing an ovenable shaped article of polyethylene terephthalate wherein the polyethylene terephthalate is heated to a temperature in which it is in a thermoformable plastic state, formed as a sheet, locally cooled to form a skin on the surface of the sheet whale maintaining the sheet as a whole in the thermoformable plastic state and vacuum forming the shaped article within cavities on a rotating drum. The cavities are additionally provided with controlled heaters to heat the shaped article to impart thereto a degree of crystallinity of at least about 20% and the sheet is laterally and longitudinally tensioned after removal from the drum to prevent distortion.
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Bushey C. Scott
Therma-Plate Corporation
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