Plastic article or earthenware shaping or treating: apparatus – Press forming means – press reshaping means – or vulcanizing... – Cooperating endless belts
Patent
1978-06-19
1979-08-14
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Press forming means, press reshaping means, or vulcanizing...
Cooperating endless belts
425141, B29C 300
Patent
active
041643879
ABSTRACT:
A method and apparatus for producing sheets of plastic having precisely controlled thickness. Two endless steel belts are positioned to provide coextensive runs between which there is a press-gap of uniform thickness. Each of the belts is provided throughout the treatment zone with a back-up pressure structure formed by a continuous array of rollers positioned along each of the belts and a back-up plate structure which is positioned to provide a precisely controlled gap for the rollers. The rollers are turned by the contact with the belt and roll along a path throughout the length of the treatment zone. Heated liquid is passed through the plates to control the temperature of the product being treated. Each of the plate structures is held against its array of rollers by a plurality of steel bearing strips, the transverse dimension of each of which is controlled by passing a heated liquid through it. The bearing strips, in turn, rest upon a press table which exerts pressure against the belt through the bearing strips, the heating plate and the array of rollers. The strips are thermally responsive so that their dimensions are increased by an increase in temperature, and extend longitudinally of the belt runs. Hence, the desired precise thickness of the press-gap can be controlled by varying the temperature of the strips. The longitudinal positioning of the strips permits the control to be effective transversely of the length of the press-gap.
REFERENCES:
patent: 3795470 (1974-03-01), DeMets
patent: 3836298 (1974-09-01), Ernst
patent: 3837774 (1974-09-01), Ross et al.
patent: 3881852 (1975-05-01), Ahrweiler
patent: 3907473 (1975-09-01), DeMets
patent: 3926542 (1975-12-01), Ahrweiler
patent: 3945789 (1976-03-01), Boman
patent: 4043719 (1977-08-01), Jones
Schermutzki Konrad
Stabler Gerhard
Flint, Jr. J. Howard
Sandvik Conveyor GmbH
Stults Harold L.
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