Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Plural sequential shaping or molding steps on same workpiece
Patent
1981-03-09
1982-11-23
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Plural sequential shaping or molding steps on same workpiece
264321, 264322, 264DIG66, 425398, 425400, 425DIG41, B29C 1700, B29C 100, B29D 2700
Patent
active
043604919
ABSTRACT:
A shape-preserving device which is attached to the top and bottom mold section of a thermoforming machine which reciprocatingly thermoforms articles from a heat-softened plastic sheet. The device includes a cavity mold attached to one mold section and a remolding shoe assembly attached to the other. The remolding shoe assembly includes a floating remolding shoe attached to the outer end of a piston rod connected to a pressurized fluid-actuated pneumatic cylinder which is in unimpeded flow communication with a source of compressed air. As the sheet indexing movement is completed, the mold cavity and the floating shoe clamp the rearmost portion of the rearmost articles produced by the preceding shot and maintain a substantially constant pressure upon this portion while at least one mold section continues to move to full close position, while the succeeding mold shot is being completed, and while the mold section to which the floating shoe is attached moves away from the thermoformed sheet through a distance somewhat greater than the depth of the thermoformed articles.
REFERENCES:
patent: 3172927 (1965-03-01), Mojonnier
patent: 3504074 (1970-03-01), Snow
patent: 3518334 (1970-06-01), Carrigan et al.
patent: 3669606 (1972-06-01), Brown
patent: 3923948 (1975-12-01), Jackson et al.
patent: 4009981 (1977-03-01), Rosen
patent: 4053549 (1977-10-01), Vandor
Anderson Philip E.
Gilman Michael G.
Huggett Charles A.
Mobil Oil Corporation
Powers, Jr. James F.
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