Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1980-02-06
1982-06-22
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
222 56, 222 63, 264 404, 264 407, 264176R, 418102, 418191, 425376B, B29F 306, F04C 2500
Patent
active
043362133
ABSTRACT:
A plastic extrusion apparatus is provided which includes a gear pump for accurately metering the plastic through a die. The apparatus is adapted to process highly viscous plastic material under high temperature and pressure conditions, and the gear pump includes a non-leaking and substantially frictionless seal for the drive shaft. The seal comprises a sleeve surrounding the shaft, and a shallow helical channel formed in the bore of the sleeve, with the helical channel being of a hand such that forward rotation of the shaft results in the plastic which enters the clearance between the shaft and sleeve to be effectively pumped back toward the interior of the housing.
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