Method of controlling thickness of thermoplastic extruded profil

Details Method of controlling thickness of thermoplastic extruded profil Method of controlling thickness of thermoplastic extruded profil

1991-05-10

1992-05-12

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Of varying cross-sectional area or with intermittent...

264 405, 264 407, 264508, 425145, 425380, 425465, 425396, B29C 4720

Patent

active

051125463

ABSTRACT:
A process is described for precisely controlling the thickness of a thermoplastic extruded profile by varying the output of a continuously operating extrusion die. The process employs an ancillary device preferably taking the form of accumulator means connected to an extrusion die, or to a passageway communicating with the die. The accumulator means functions as a variable volume device, and by action of cylinder-piston structure or the equivalent thereof, is effective to either receive or discharge melted thermoplastic resin as the exemplary working medium. In this manner, the accumulator means receives melt from the stream when the die output needs to be reduced, and delivers melt to the stream when the die output needs to be increased. Various illustrative structural arrangements are disclosed for accomplishing the process concepts of the present invention.

REFERENCES:
patent: 3148231 (1964-09-01), Spencer
patent: 3275728 (1966-09-01), Martino
patent: 3280847 (1966-10-01), Chisholm et al.
patent: 3420926 (1969-01-01), Mason et al.
patent: 3674404 (1972-07-01), Burlis et al.
patent: 3723218 (1973-03-01), Gaffney
patent: 4209476 (1980-06-01), Harris
patent: 4717326 (1988-01-01), Motonaga et al.

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