Nozzle for injection molding of thermoplastics

Details Nozzle for injection molding of thermoplastics Nozzle for injection molding of thermoplastics

1975-04-21

1977-03-08

Love, John J.

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

425245NS, B05B 130

Patent

active

040109038

ABSTRACT:
A nozzle to be connected between a conventional molding machine and a mold cavity for injecting molten resin of thermoplastics into a mold cavity where a gate at the front end of a cylinder of the nozzle opens and closes automatically according to the pressure of molten resin. A differential moving piston slidably disposed in the cylinder includes a front piston and a rear piston mounted on the front end and the rear end thereof respectively, a passage for molten resin axially drilled therethrough and a needle protruding forward from the front end of the front piston for mating with the gate according to the sliding movement thereof. A spring disposed in the cylinder pushes the differential moving piston forward to close the gate. Herein said front piston is larger in its effective area functioning as a piston head than that of said rear piston so that when the pressure of molten resin increases the differential moving piston slides backward to open the gate against the spring by the backward pushing differential force between the total pressure on the front piston and the total pressure on the rear piston.

REFERENCES:
patent: 3010156 (1961-11-01), Smith
patent: 3023458 (1962-03-01), Seymour
patent: 3295169 (1967-01-01), Moslo
patent: 3387790 (1968-06-01), Luca
patent: 3892362 (1975-07-01), Gayfer
patent: 3941540 (1976-03-01), Driscoll

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