Hot runner type mold

Details Hot runner type mold Hot runner type mold

1975-07-23

1977-08-23

Baldwin, Robert D.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means between charger and mold to cut off flow of...

425542, B29F 103

Patent

active

040437264

ABSTRACT:
A hot runner mold provided with a runner pipe instead of a runner block wherein the walls of both end portions of the runner pipe are formed progressively thinner toward the tip of both end portions so as to cause the inner diameter of the walls to approximate to the outer diameter. One end portion of the runner pipe is made engageable with a hole formed in one side wall of a nozzle assembly and the other end portion is made engageable with a hole bored in a sprue bush. The runner pipe is laid between the nozzle assembly and sprue bush in a state inserted at both ends into said holes with a clearance provided therein in the axial directon of the runner pipe. Upon application of injection pressure, the thin walls of both end portions of the runner pipe expand outward in the radial direction for tight attachment to the inner walls of the holes, thereby presenting a sealing effect. The thermal deformation of the runner pipe in the axial direction is absorbed in the abovementioned clearances provided in the holes, thereby preventing heat transfer from the runner pipe to other mold parts than the nozzle assembly and sprue bush.

REFERENCES:
patent: 3491408 (1970-01-01), Natkins
patent: 3677682 (1972-07-01), Putkowski
patent: 3719310 (1973-03-01), Hunten
patent: 3807924 (1974-04-01), Mingotti
patent: 3867080 (1975-02-01), Bruder

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