Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling rate of movement of molding material or its...
Patent
1976-12-20
1978-08-15
Spicer, Jr., Robert L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling rate of movement of molding material or its...
425145, B29F 306
Patent
active
041072464
ABSTRACT:
In an extrusion system wherein a single source of molten extrudable material is utilized to provide feed to a plurality of extrusion lines, the rate of flow of extrudable material from the source thereof to the plurality of extrusion lines is controlled to provide a preselected total product output rate. The position of a flow control valve means associated with each extrusion line is controlled to maintain a preselected material supply pressure upstream of said plurality of extrusion lines and to provide a preselected relationship among the measured production rates of said plurality of extrusion lines. In a preferred embodiment, an extrusion system having two extrusion lines supplied by a single source of molten extrudable material is controlled to provide a preselected total production rate, a preselected molten material source pressure, and a preselected balance between the extrusion rates of the two extrusion lines.
REFERENCES:
patent: 3025568 (1962-03-01), Hardy
patent: 3642404 (1972-02-01), Nagawa
patent: 3728056 (1973-04-01), Theysohn
patent: 3861841 (1975-01-01), Hanning
patent: 3933155 (1976-01-01), Johnston
Phillips Petroleum Company
Spicer, Jr. Robert L.
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