Plastic article or earthenware shaping or treating: apparatus – With mechanical means forming or expanding pores
Patent
1978-11-29
1980-07-08
Anderson, Philip
Plastic article or earthenware shaping or treating: apparatus
With mechanical means forming or expanding pores
261 45, 261 63, 264 50, 425145, 425146, B29D 2700
Patent
active
042115230
ABSTRACT:
Gas-flow control apparatus for delivering a constant volumetric flow of gas to an extruder through which a molten thermoplastic resin is being processed. The gas-flow control apparatus consists of a compressor having an intake and a discharge and is operable to produce a constant volumetric gas flow output. A discharge conduit connects the compressor discharge with the extruder and a feedback loop system consisting of a feedback conduit connects the compressor discharge with the compressor intake and includes a bypass valve. The feedback loop system thus is operable to divert a selected fraction of the compressor output back to the compressor intake thereby to control the volume of gas supplied to the extruder. Flow measuring apparatus measures the volume of the supply gas delivered to the compressor which is equal to the volume of the gas delivered to the extruder and regulates the bypass valve so that a predetermined volumetric flow of gas to the extruder is maintained. A back pressure regulator in the discharge conduit maintains a preselected back pressure on the compressor discharge and the bypass valve to insure a constant volumetric flow of gas to the extruder in spite of pressure variations in the extruder.
REFERENCES:
patent: 2575675 (1951-11-01), Morgan
patent: 3372528 (1968-03-01), Hoff
patent: 3975473 (1976-08-01), Mulvarey
patent: 3981649 (1976-09-01), Shimano et al.
patent: 4043715 (1977-08-01), Hendry
patent: 4083341 (1978-04-01), Brettschneider et al.
patent: 4107354 (1978-08-01), Wilkenloh et al.
Anderson Philip
Hoover Universal Inc.
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