Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Of varying cross-sectional area or with intermittent...
Patent
1990-01-05
1991-05-21
Chiesa, Richard L.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Of varying cross-sectional area or with intermittent...
264286, 264508, B29C 5330
Patent
active
050173219
ABSTRACT:
The present invention is directed to the manufacture of plastic tubing exemplified by corrugated plastic tile and parts related thereto, in which molds for shaping an extrudable plastic material are caused to shuttle linearly forwardly and rearwardly with respect to an extruding source of said plastic material. Sequentially related to linear mold movement is opening and closing mold action, which is correlated to the discharge of plastic material from the extruding source thereof. Provision is also made herein during the course of linear mold movement for parking one or more predetermined molds at a location spaced from the extruding source.
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patent: 3981663 (1976-09-01), Lupke
patent: 4199314 (1980-04-01), Lupke et al.
patent: 4439130 (1984-03-01), Dickhut et al.
patent: 4504206 (1985-03-01), Lupke et al.
patent: 4662428 (1987-05-01), Trendov
patent: 4787598 (1988-11-01), Rahn et al.
Chiesa Richard L.
Claeboe Bertram F.
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