Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including shaping means comprising fluid pressure contacting...
Patent
1977-06-03
1979-07-31
Spicer, Jr., Robert L.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Including shaping means comprising fluid pressure contacting...
264535, B29C 1704
Patent
active
041628845
ABSTRACT:
Plastics foil is shaped in a deep drawing apparatus by being placed in a mould, while the foil is below its deformation temperature, having heated wall surfaces and by applying a pressure differential to the foil so that it progressively stretches and contacts the mould wall. The progressive heating and stretching ensures that the corners of the moulded article are not thinner than the remaining portions of the moulded article, thus reducing the amount of plastics material necessary for an article of given strength.
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patent: 4016231 (1977-04-01), Hawkins
Multivac Sepp Haggenmuller KG
Spicer, Jr. Robert L.
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