Foam extrusion die and monitoring apparatus

Details Foam extrusion die and monitoring apparatus Foam extrusion die and monitoring apparatus

1982-09-24

1984-05-01

Anderson, Philip E.

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

264 405, 264 51, 264101, 425135, 425138, 425466, 425817C, B29D 2700, B29F 304, G01B 514

Patent

active

044458371

ABSTRACT:
A foam extrusion die and monitoring apparatus, including a pair of adjustable die lip members having opposed, rigid die lips defining therebetween an elongated arcuate die orifice, is characterized by position sensors located along the arc of the die lips to monitor the die opening at such locations. The position sensors include sensing styli mounted for movement with the lip members at respective sensing locations such as at the arc ends and arc centers of the die lips, and provision is made for connecting the sensing styli as by precision push-pull, flexible cables to respective linear variable displacement transformers which provide electrical output signals representative of sensed positions to remotely located monitoring circuitry. The apparatus has particular application in a vacuum extrusion line wherein the extrusion die is located inside a vacuum chamber and thus is inaccessible during extrusion. In such application, the apparatus provides immediate read-out of die lip position data outside of the vacuum chamber for use in accurately obtaining and maintaining desired die orifice size and shape.

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Scheiner, Lowell L., Mang. Edt. "With Resin Short Prices Up . . . Can Computer-Controlled Extrusion Help?", In Plastics Technology, Feb. 1974, pp. 43-49.

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