Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1980-11-07
1983-10-11
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Starting material is nonhollow planar finite length preform...
264550, 264551, 264553, 264153, 264163, 425292, 425298, 4253051, B29C 1704, B29C 1710
Patent
active
044091788
ABSTRACT:
A method of forming plastic sheet material into articles. The sheet is heated and is formed into the article in a mould. The mould parts severe the portion of the sheet which is to be formed into the article and at the peripheral edge of the said portion the mould parts squeeze the plastics material to cause it to flow outwardly into a bead cavity in which the material forms into a thickened bead.
REFERENCES:
patent: 3011212 (1961-12-01), Marshall et al.
patent: 3470281 (1969-09-01), Knowles
patent: 3548459 (1970-12-01), Dockery
patent: 3917788 (1975-11-01), Padovanni
Philpitt Fred
Plastona (John Waddington) Ltd
Silbaugh Jan H.
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