Corrugated mold block

Details Corrugated mold block Corrugated mold block

1989-12-26

1991-10-22

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

Sets of press couples comprising registering female mold...

425532, 425539, 425370, 425371, 425388, 425392, B29C 4938

Patent

active

050591096

ABSTRACT:
A corrugated mold block for a vacuum machine for molding corrugated tubes is formed of a plurality of sub-blocks rigidly secured end to end. Each sub-block has an arcuate face which is corrugated with not more than one complete wavelength of circumferential grooves and lands, and two longitudinally spaced end surfaces. A vacuum channel is provided about one of the end surfaces of each sub-block, and openings in each sub-block connect the channel and the face. When the sub-blocks are secured together into a mold block (and when mold blocks abut during molding), the vacuum channels and openings together define vacuum passages for each of the corrugation grooves, which passages are all connected to a vacuum source for drawing a vacuum during molding.

REFERENCES:
patent: 1984384 (1934-12-01), Sheffield
patent: 3914101 (1975-10-01), Stefanka
patent: 4199314 (1980-04-01), Lupke et al.
patent: 4226580 (1980-10-01), Lupke et al.
patent: 4319872 (1982-03-01), Lupke et al.
patent: 4439130 (1984-03-01), Dickhut et al.
patent: 4492551 (1985-01-01), Hegler et al.
patent: 4718844 (1988-01-01), Dickhut et al.

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