Plastic article or earthenware shaping or treating: apparatus – Stock pressurizing means operably associated with downstream...
Patent
1978-07-17
1979-11-06
Schulz, William E.
Plastic article or earthenware shaping or treating: apparatus
Stock pressurizing means operably associated with downstream...
264176R, 264349, 425378R, 425380, B29F 306
Patent
active
041734459
ABSTRACT:
In plastics extrusion apparatus including a rotating screw in a cylinder forming a channel receiving solid material and eventually expressing it through a die, the channel comprising a feed zone, a melting and compression zone and a melt pumping zone, the improvement wherein a solids decompression zone is between the feed and the melting and compression zones which has increased unit volume relative to that of the feed zone, with the channel of the melting and compression zone communicating with the feed inlet through the decompression and feed zones such that solids are initially metered producing a starved condition so as to melt at substantially atmospheric pressure without filling the channel of the melting and compression zone until close to its end.
REFERENCES:
patent: 3023456 (1962-03-01), Palfrey
patent: 3263276 (1966-08-01), Maier
patent: 3456298 (1969-07-01), Foster et al.
patent: 3866890 (1975-02-01), Tadmor et al.
patent: 3949973 (1976-04-01), Bishop et al.
patent: 4006209 (1977-02-01), Chiselko et al.
patent: 4107260 (1978-08-01), Dougherty
Techn. Papers Soc. of Plastic Engineers Annual Techn. Conf. May 1974, pp. 462-465.
Plastic Engineering, Improved Processing with Meter Starved Feeding of Extruders, Jun. 1978, pp. 45-49.
McKelvey James M.
Steingiser Samuel
Monsanto Company
Murphy Michael J.
Schulz William E.
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