Plastic article or earthenware shaping or treating: apparatus – With separate and distinct upstream agitating or kneading means – With separate and distinct gas withdrawal chamber
Patent
1998-06-18
2000-04-04
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
With separate and distinct upstream agitating or kneading means
With separate and distinct gas withdrawal chamber
366 761, B29C 4710
Patent
active
060453486
ABSTRACT:
The present invention is directed to a hopper structure for feeding a powdery material adapted to enable gas, etc., generated in a plasticizing cylinder to escape irrespective of the state of feed of the powdery material within a hopper. To this end, the hopper structure of the present invention is arranged such that the plasticizing cylinder is formed with a material feed port for providing a communication between the interior and the exterior of the plasticizing cylinder, and that a hopper is provided for feeding a powdery material via the material feed port to the outer periphery of a screw within the plasticizing cylinder, and that a material feeding tube is mounted to the bottom of the hopper for allowing a communication between the bottom of the hopper and the vicinity of the outer periphery of the screw, with a gap for the removal of air being formed between the outer peripheral surface of the material feeding tube and the inner peripheral surface of the material feed port, the gap extending from the vicinity of the outer periphery of the screw to the exterior. The present invention is applied for the feed of a powdery molding material into the plasticizing cylinder of an in-line screw injection molding machine or of an in-line screw extrusion molding machine.
REFERENCES:
patent: 4112519 (1978-09-01), Kruder
patent: 4636084 (1987-01-01), Kopernicky
Kariya Toshihiko
Kawahara Manabu
Kinoshita Kiyoshi
Heitbrink Tim
Mitsubishi Heavy Industries Ltd.
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