Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Perforation by differential fluid pressure; or smoothing,...
Patent
1979-04-03
1981-03-17
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Perforation by differential fluid pressure; or smoothing,...
264553, 425290, B29C 1704, B29C 1714
Patent
active
042566908
ABSTRACT:
A forming die including a cup-shaped cavity for the vacuum thermoforming of sheets of thermoplastic material includes, in the center of its bottom, an upwardly directed pointed projection, the height of which is remarkably smaller than the depth of the said cavity. The suction bores through which vacuum is generated at the interior of the cavity are arranged at the periphery of the bottom of the cavity itself.
REFERENCES:
patent: 2509882 (1950-05-01), Roberts
patent: 3308213 (1967-03-01), Carrigan et al.
Greigg Edwin E.
NESPAK S.p.A. Societa Generale per l'Imballaggio
Silbaugh Jan H.
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