Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Temperature control
Patent
1975-07-17
1978-01-24
Husar, Francis S.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Temperature control
210391, 366 87, 425154, 425183, 425185, 425192R, 425376R, B29F 300
Patent
active
040701387
ABSTRACT:
A housing has a threaded bore opening to an inlet and an outlet. The outlet axis is substantially perpendicular to the bore axis while the inlet axis is off-center from the bore axis. A plug in the housing bore comprises three cylindrical portions which are threaded in the housing bore and which are joined together but spaced apart by perforate cylindrical support tubes of lesser diameter than the threaded portions. A screen mesh extends about each support tube. Bores extend radially through two of the threaded cylindrical portions and only one at a time is alignable with the housing outlet, depending upon the threaded position of the plug in the housing bore. Accordingly, molten plastic material enters into the bore from the off-center housing inlet which urges the plastic material around the exterior of the screen to limit clogging and to extend screening life. Flow continues through the screen, the radial openings in the support tube, the bore in the threaded cylindrical portion of the plug, and the housing outlet. Back-pressure of the fluid material is adjustable by rotating the plug and its outlet bore with respect to the housing outlet to vary the opening size therebetween. Accidental complete lack of communication between the cylindrical portion bore and the housing outlet and any resulting excessive fluid back-pressure damaging to the extruder is prevented by an annular groove in the threaded cylindrical portion which permits material leakage out of the housing.
REFERENCES:
patent: 856832 (1907-06-01), Anderson
patent: 1595470 (1926-08-01), Johnson
patent: 2895167 (1959-07-01), Paggi
patent: 3402427 (1968-08-01), Christofas et al.
patent: 3455357 (1969-07-01), Zink
patent: 3669166 (1972-06-01), Colin
patent: 3797982 (1974-03-01), Borrello
patent: 3856683 (1974-12-01), Parr
patent: 3900399 (1975-08-01), Kreyenborg et al.
Husar Francis S.
Plastiflex Company
Rosenbaum Mark
Sternfels Lewis B.
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