Apparatus for measuring and controlling the wall thickness of pl

Details Apparatus for measuring and controlling the wall thickness of pl Apparatus for measuring and controlling the wall thickness of pl

1977-03-07

1979-01-30

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Including means advancing continuous length work through...

73629, 264 407, 425141, 425325, 425377, 425380, 425404, B29D 2304

Patent

active

041370252

ABSTRACT:
In the manufacture of plastic pipes by the extrusion process, the inside diameter of the pipe and, therefore, the wall thickness of the pipe is controlled by the takeaway speed at which the molten plastic pipe is removed from the sizing sleeve. An ultrasonic transducer is disposed at the upstream end of a sizing sleeve to provide signals representative of the thickness of the molten pipe advancing in the sizing sleeve. These signals are sent to devices for comparing the measured thickness of the molten plastic pipe with the desired thickness of the molten plastic pipe for producing a correction signal. The correction signal is employed for correcting the takeaway speed at which the molten plastic pipe is removed from the sizing sleeve.

REFERENCES:
patent: 3546745 (1970-12-01), Ball
patent: 3558758 (1971-01-01), Wendt et al.
patent: 3914356 (1975-10-01), Dembiak et al.
patent: 4022557 (1977-05-01), Johnson

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