Extrusion die and process for thickness control

Details Extrusion die and process for thickness control Extrusion die and process for thickness control

1983-11-07

1985-05-14

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

2642094, 425140, 425141, 425172, B29D 722

Patent

active

045171459

ABSTRACT:
An improved extrusion die employing proximity sensors to directly measure the actual die gap during extrusion is disclosed. The proximity sensor may be a capacitance-effect, or optical-effect sensor. Manual and automated closed-loop methods of operation are also disclosed.

REFERENCES:
patent: 3974248 (1976-08-01), Atkinson
patent: 3988582 (1976-10-01), Harman
patent: 4086044 (1978-04-01), Sikora
patent: 4152380 (1979-05-01), Graves et al.
patent: 4157503 (1979-06-01), Brunner
patent: 4409160 (1983-10-01), Kogo et al.

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