Method and apparatus for controlling the thickness of extruded s

Details Method and apparatus for controlling the thickness of extruded s Method and apparatus for controlling the thickness of extruded s

1976-09-24

1978-05-09

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Measuring a weight or volume

264 407, 264148, 264151, 264216, 425141, B29C 1700

Patent

active

040887219

ABSTRACT:
The thickness of a cut length of a continuously extruded elastomer is controlled by sampling the weight of a section of the continuous extrusion at a running-weigh-scale each second; computing and storing one-minute averages of the running-weigh-scale samples; sampling the weight of a cut length of the extrusion at a check-weigh-scale; comparing the check-weigh-scale value to the oldest stored running-weigh-scale one-minute average to obtain a targeted average; comparing the targeted running-weigh-scale average to the newest stored running-weigh-scale one-minute average to obtain a deviation from the targeted value if one exists; and converting the deviation from the targeted running-weigh-scale value to a control signal for increasing or decreasing the speed of a take-away belt positioned at the extruder exit orifice to vary the thickness of the extrusion in accordance with the deviation control signal and the speed of the belt.

REFERENCES:
patent: 2965050 (1960-12-01), Doering
patent: 3265786 (1966-08-01), Voelker
patent: 3843434 (1974-10-01), Heiks et al.
patent: 3875383 (1975-04-01), Sommerville et al.
patent: 3890078 (1975-06-01), Straumanis
patent: 3930774 (1976-01-01), Brand et al.
patent: 3930922 (1976-01-01), Donoghue et al.
patent: 3975126 (1976-08-01), Wireman et al.
patent: 3989779 (1976-11-01), Brunnhofer

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