Web thickness control

Details Web thickness control Web thickness control

1992-04-30

1993-11-09

Bushey, Scott

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Control means responsive to product weight or dimension

264 406, 425144, 425466, B29C 4792

Patent

active

052597474

ABSTRACT:
An improved apparatus providing for uniformity of web thickness. In one aspect, the apparatus includes a plurality of gap-controlling, thermal energy sources, and in heat-exchange communication with the thermal energy sources, an assembly for compensating for temperature variation proximate to the thermal energy sources and across the apparatus width. The thermal compensating assembly includes a heat exchange jacket, and in combination therewith, a heat-exchanging, working fluid that undergoes a phase change in performing its heat exchange function.
In another aspect of the invention, the apparatus includes an element disposed along an exit slot-forming lip, that reduces localized thermal gradients along the lip. This element functions as a heat sink and a heat source proximate to the lip gap, and likewise includes a heat-exchanging, working fluid that undergoes a phase change.

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