Method and apparatus for controlling size of extruded tube

Details Method and apparatus for controlling size of extruded tube Method and apparatus for controlling size of extruded tube

1980-05-12

1982-04-20

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling fluid pressure in direct contact with molding...

264 402, 264564, 425140, 4253261, B29D 702

Patent

active

043258972

ABSTRACT:
An assembly at an extruder for controlling the width of a two-layer web flattened from a tube extruded from a rotating or oscillating head of the extruder comprises monitors for detecting the velocity and edge-positions of the web upon transport thereof away from the extruder. A control circuit calculates the deviation of the actual web width from a predetermined width and emits a correction signal relayed via a stationary infrared-radiation transmitter and a receiver on the extruder head to valves controlling the pressurization of the extruded tube by a blower also mounted on the extruder head.

REFERENCES:
patent: 3092874 (1963-06-01), Fallwell
patent: 3341888 (1967-09-01), Bridge et al.
patent: 3368007 (1968-02-01), Palmer
patent: 4003972 (1977-01-01), Herz
patent: 4189288 (1980-02-01), Halter

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