Plastic article or earthenware shaping or treating: apparatus – Including means advancing continuous length work through...
Patent
1986-07-25
1988-04-26
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Including means advancing continuous length work through...
73622, 264 23, 264 407, 425141, 4251742, B29C 4792
Patent
active
047401460
ABSTRACT:
Apparatus for producing plastic pipes by an extrusion process in which the wall thickness of the plastic pipe is controlled by the takeaway speed at which a soft plastic pipe is removed from a metal sizing sleeve. To measure the wall thickness of the soft plastic pipe advancing through the sizing sleeve for regulating the takeaway speed, a transducer emits ultrasonic sound through a plastic transmission line mounted in or on the sizing sleeve and interposed between the transducer and the plastic pipe. The time interval between the emission of a sonic pulse by the transducer and the detection of a reflected sonic pulse from the inner wall of the advancing soft plastic pipe is a function of the wall thickness of the plastic pipe in a soft plastic state.
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Chiesa Richard L.
Wiseman Jack M.
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