Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Temperature control
Patent
1994-02-10
1997-04-15
Timm, Catherine
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Temperature control
425384, 264 406, 264544, 264237, B29C 5142
Patent
active
056207158
ABSTRACT:
A four-station rotary thermoformer has a rotary carriage which transports a sheet of thermoplastic material clamped on a subframe through a load/unload station; a heating station; a forming station where the sheet is molded; and a cooling station removed from the mold where the part is cooled on the subframe. The molded sheet is cooled in a cavity which has a lower portion mounted on a lift which travels vertically to engage against an upper portion and enclose the sheet for cooling. A multiplicity of air vents discharge cooling air into the cavity. Cooling air leaves the cavity through recirculation duct. The supply of air within the cooling cavity results in a uniform current of air against the article's surface, thus providing uniform cooling. A programmable controller controls the supply of cooling air and receives input from an infrared sensor which detects the temperature of the thermoformed article and also receives information from a sensor of the cooling air temperature. The programmable controller is programmed to provide a cooling cycle consisting of a three-parts. In the first part, the air is recirculated using the heat capacity of the recirculating air in the air supply system to start cooling at a low rate. During the second part, the flow of cooling air temperature is lowered until a pre-determined maximum cooling rate is reached and held for a selected time. During the third part, the cooling air is again recirculated.
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Geurts Charles G.
Hart James P.
Roberts Wesley W.
Penda Corporation
Timm Catherine
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