Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Coacting shaping surfaces
Patent
1997-06-11
1999-08-17
Silbaugh, Jan H.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Coacting shaping surfaces
219388, 226 90, 226 91, 2261182, 392415, 392416, 392417, 425384, 4253871, 425388, 432 8, 432 59, B29B 1302, B29C 3100
Patent
active
059391073
ABSTRACT:
A preheater and method of preheating a thermoplastic sheet prior to entry of the sheet into a differential pressure forming machine which forms an article in the sheet. The preheater includes mechanism for initially threading a sheet in a generally horizontal plane, mechanism for concurrently displacing upstream and downstream portions of the sheet in vertically opposite directions relative to the horizontal plane to dispose a portion of the sheet in an upstanding plane. A heater is provided for heating the upstanding portion of the sheet in the upstanding plane. After the sheet has been repositioned with a portion in the upstanding plane, the heater is laterally moved from an inoperative position to a sheet heating position receiving the portion of the sheet at the sheet heating station. Mechanism is provided for selectively moving the sheet downstream after the sheet has been vertically displaced.
REFERENCES:
patent: 2050053 (1936-02-01), Graf et al.
patent: 3346923 (1967-10-01), Brown et al.
patent: 3459410 (1969-08-01), Uban
patent: 3664791 (1972-05-01), Brown
patent: 3722774 (1973-03-01), Scheinderman et al.
Hemmerle Publication Involving PP-BHJ6 Infra-Red Preheater Including Four Pages.
Arends Albert W.
Richard Andrew P.
Lee Dae Young
Silbaugh Jan H.
Swartz John J.
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