Apparatus and method for producing and molding structural foam

Details Apparatus and method for producing and molding structural foam Apparatus and method for producing and molding structural foam

1990-06-22

1992-03-24

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

264 50, 366 76, 366 81, 366157, 425559, 425587, 425205, 425208, 425817R, B29C 4550

Patent

active

050982672

ABSTRACT:
A single-state apparatus for injection molding structural foam articles has a resin plasticating barrel in which a cylindrical plunger reciprocates and rotates. The plunger has a screw section for plasticating resin and advancing the plasticate into a metering section with grooves in which plasticate flows. The grooves are contiguous to a fluid foaming agent inlet in the side of the barrel so that they alternately open and close the inlet to introduce fluid foaming agent periodically into the plasticate. Downstream, the plunger has channels for mixing and advancing plasticate to the forward end of the plunger where it accumulates and is periodically rammed by the plunger into the mold.

REFERENCES:
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patent: 3728053 (1973-04-01), Stillhard et al.
patent: 3856442 (1974-12-01), Gallagher et al.
patent: 3937447 (1976-02-01), Eckardt et al.
patent: 3941529 (1976-03-01), Klingebiel
patent: 4067673 (1978-01-01), Hendry
patent: 4169679 (1979-10-01), Miller et al.
patent: 4211523 (1980-07-01), Hunerberg
patent: 4302409 (1981-11-01), Miller et al.
patent: 4548776 (1985-10-01), Holdredge, Jr.
"Thermoplastic Structural Foam Molding" by R. J. LaBelle, Modern Plastics Encyclopedia, Oct. 1987, vol. 64, No. 10A, pp. 242-246.

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