Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including shaping means comprising fluid pressure contacting...
Patent
1985-10-15
1987-12-22
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Including shaping means comprising fluid pressure contacting...
204 11, 249 55, 249 80, 249113, 249135, 249141, 264571, 425DIG30, B29C 5110
Patent
active
047144246
ABSTRACT:
A vacuum mold for vacuum-forming a plastic sheet heated to a high temperature to transfer grain patterns onto the surface of the plastic sheet, the mold comprising an electrocast shell formed, by an electroforming step, with a casting surface having the grain patterns thereon and a multitude of fine vacuum holes uniformly distributed at the casting surface. A back-up body is mounted at the rear surface of the electrocast shell and is provided with vent holes communicating with the vacuum holes in the shell.
REFERENCES:
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patent: 3353219 (1967-11-01), Snyder
patent: 3434182 (1969-03-01), Peterson
patent: 3811175 (1974-05-01), Garner et al.
patent: 4063705 (1977-12-01), Vodra
patent: 4077853 (1978-03-01), Coll-Palagos
patent: 4579632 (1986-04-01), Brotz
Furuya Tamio
Ishige Yoshiki
Kinugasa Toshiyuki
Takahashi Shoji
Tsuchimoto Yuichi
Honda Giken Kogyo Kabushiki Kaisha
Housel James C.
Woo Jay H.
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