Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Patent
1976-02-02
1976-12-28
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
249 79, 425407, B29J 508
Patent
active
039999173
ABSTRACT:
A mold assembly for use in heat forming granular material into a discontinuous cross-sectional board. The mold assembly has an upper and lower frame and two mold halves forming a mold cavity therebetween. The mold halves are coupled to the frame by means of spacer bars. The spacer bars are designed to minimize conduction of heat from the mold to the frame and are positioned over peripheral heaters in the mold to minimize heat gradients within the mold. In addition, the spacer bars minimize heat distortion of the frame members. The interior of the mold is provided with a first array of heaters extending parallel to the longitudinal axis of the mold near the surfaces of the mold halves remote from the mold cavity. A second array of heaters extend through the mold halves parallel to the longitudinal axis of the mold adjacent the surfaces of the mold cavity. The heaters in the first and second array are independently controlled to maintain a constant temperature through the cross-section of the mold. The heaters further have a variable output capacity along their length to maintain a constant temperature along the longitudinal axis of the mold.
REFERENCES:
patent: 3142185 (1964-07-01), Knowles
patent: 3229009 (1966-01-01), Knowles
patent: 3242527 (1966-03-01), Rosenberg
patent: 3868204 (1975-02-01), Bongers
patent: 3950118 (1976-04-01), Adair
Flint, Jr. J. Howard
K-N-P
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