Method of controlling the thickness of an extruded plastic artic

Details Method of controlling the thickness of an extruded plastic artic Method of controlling the thickness of an extruded plastic artic

1988-03-28

1989-11-21

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 402, 264 406, 264 407, 2642091, 364473, 364563, 425141, 425144, B29C 4792

Patent

active

048821047

ABSTRACT:
A method for monitoring and controlling the wall thickness of an extruded profile of heated polymeric material that issues from an extrusion die. The die includes a plurality of discrete sectors each having a controllable heat source and a temperature sensor, and the temperature at each particular sector is controlled and adjusted in order to change the measured wall thickness corresponding with that particular sector as necessary to provide a desired wall thickness distribution. A characteristic curve for the particular material is provided as an input quantity and involves the relationship between a change in extrusion temperature versus the corresponding change in wall thickness, and that relationship is utilized to effect rapid adjustment of wall thickness by means of a temperature change in order to provide a finished article having the desired thickness profile and without having excessive material, to thereby reduce the weight and cost of the extruded article.

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