Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With accumulator – trap chamber – or serially arranged valves...
Patent
1994-07-06
1996-03-19
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With accumulator, trap chamber, or serially arranged valves...
425558, 425559, B29C 4502
Patent
active
054999154
ABSTRACT:
Molten resin flows from the opening of a path and washes a closed space of an injection chamber to prevent molten resin from being retained therein. Resin leaking from between a peripheral wall of a cylinder and a head of an injection plunger is quickly exhausted. When a screw retreats, molten resin is delivered from the opening to the injection chamber through the path. Resin from the opening causes a flow that washes and agitates resin remaining in the closed space opposite a nozzle hole, since a front face of the plunger is conical in shape with a protruding or higher center. There is a slight step between the plunger head and a shank of the plunger. The step scrapes resin which adheres on the cylinder peripheral wall to quickly exhaust such resin through a narrow clearance between the peripheral wall and the shank. The plunger head is coated with a ceramic.
REFERENCES:
Plastics Extrusion Technology, Allan L. Griff, 1962, p. 8.
Heitbrink Tim
Sodick Co. Ltd.
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