Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – Including means to prepare parison
Patent
1980-04-21
1982-03-16
Silbaugh, Jan H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
Including means to prepare parison
264508, 4253261, 425812, B29C 1707, B29D 2304
Patent
active
043198724
ABSTRACT:
Apparatus for producing corrugated thermoplastic tubing of the type comprising a pair of complementary upper and lower mold assemblies each having an endless chain of articulately interconnected mold blocks which are driven along a forward run and back along a return run, the mold blocks cooperating in pairs along the forward run to form an axially extending tubular mold tunnel, within which the tubing is expanded by vacuum forming or blow molding. The mold blocks have mold-defining faces of corrugated form with alternating troughs and crests. Each mold block is formed with passages which extend between the bases of the troughs of the corrugations and the exterior of the mold block. These passages communicate with the base of each trough throughout its length, and serve to permit the escape of any atmospheric air which is trapped by the tubing in the troughs during expansion of the tubing.
REFERENCES:
patent: 3262159 (1966-07-01), Falkenau et al.
patent: 3677676 (1972-07-01), Hegler
patent: 3751541 (1973-08-01), Hegler
patent: 3981663 (1976-09-01), Lupke
patent: 4184831 (1980-01-01), Hegler et al.
patent: 4199314 (1980-04-01), Lupke et al.
Lupke Gerd P. H.
Lupke Manfred A. A.
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