Method of and apparatus for maintaining a constant wall thicknes

Details Method of and apparatus for maintaining a constant wall thicknes Method of and apparatus for maintaining a constant wall thicknes

1984-02-13

1985-11-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 401, 264 402, 264 404, 264 407, 425141, 425147, 425155, 425159, 4251742, B29D 722

Patent

active

045512892

ABSTRACT:
An extruder is controlled in response to the thickness measurement of the extruded strand. The thickness measuring head is initially given a displacement transverse to the extrusion direction, preferably around the extruded strand and the output signals from the head are integrated to form a mean value around the periphery. A comparison of this mean value with the set point wall thickness value is then utilized to provide continuous correction of the output of the head which is utilized to regulate the extruder operation.

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patent: 4428896 (1984-01-01), Stevenson

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