Draw-back valve assembly for an injection molding apparatus

Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Means responsive to abnormal condition completely stop...

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264 405, 26432813, 425147, 425149, 425170, 425555, 425564, B29C 4577

Patent

active

046326529

ABSTRACT:
An injection molding apparatus including a barrel for holding molten plastic material, a first passage connected at one end with the barrel for receiving hot plastic material from the barrel, a second passage connected with the other end of the first passage for receiving molten material from the first passage for supplying the material to a mold, a cylinder, a third passage connected at one end with the cylinder and connected at its other end with the second passage, a piston in the cylinder, movable by pressure means in one direction to maintain pressure on molten material in the cylinder, the third passage and the second passage, and movable by pressure means in the other direction to exert a suction action in the cylinder, the third passage and the second passage for drawing molten material in the second passage back into the third passage and the cylinder, and a valve means. In such injection molding apparatus means for maintaining the valve means between in three positions including a restricted flow position is provided.
In such injection molding apparatus means for controlling the pressure in the cylinder for at least one set point pressure is provided.

REFERENCES:
patent: Re28721 (1976-02-01), Farrell
patent: 3667884 (1972-06-01), Reinfeld
patent: 4473215 (1984-09-01), Rathfon, II et al.

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