Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1978-02-27
1979-05-01
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264 401, 264 407, 264209, 425141, 4251742, B06B 300
Patent
active
041523806
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: 3184794 (1965-05-01), Gamble et al.
patent: 3246055 (1966-04-01), Pendleton
patent: 3473194 (1969-10-01), Farrow
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
Angelbeck Peter
Graves Kenneth E.
Thurlow Jeffery R.
Wiseman Jack M.
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