Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Patent
1992-07-23
1993-12-07
Nguyen, Khanh P.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
425192R, 425197, 425205, 425207, 425208, 425209, 4253781, 4253824, 425461, 366 76, 366 77, 366 87, 366147, 366190, 366195, B29C 4750, B29C 4760, B29C 4784, B29C 4792
Patent
active
052678474
ABSTRACT:
A compact and precision extrusion system for extruding strips of rubber compounds with profiles of accurate dimensions. Strips of rubber compound are uniformly heated and mixed in an extruder and then passed through a low pressure drop strainer to remove foreign matter. The strained compound then is fed directly into a gear pump which delivers precise volumes of the rubber compound immediately into the spread chamber of an extrusion head after which it passes through a die to form a precise strip of the rubber compound. The strainer and extrusion head are movably mounted with respect to the gear pump for axial separation from the gear pump for easy removal of the rubber compound from the various components of the system to facilitate compound changes. A control system regulates the speed of the extruder to provide a near constant pressure at the entrance port of the gear pump to precisely regulate the rate of extrusion of the compound from the extrusion head. The extruder preferably includes a feed section, a pressure generation section, and a mix section which maintain the temperature of the rubber compound below 100.degree. C.
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Bohm Georg G. A.
Chaplin Gregory D.
Greenstreet Arthur W.
Spragg Charles D.
Bridgestone Corporation
Nguyen Khanh P.
Thomas David A.
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