Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1983-11-23
1985-10-22
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264 53, 264 54, 26432817, 264DIG83, 366 79, 366280, 425 4R, 425205, 425207, 425209, 425560, 425817R, B29D 2700
Patent
active
045487766
ABSTRACT:
An apparatus and method are disclosed which greatly facilitate molding of plastic material in the form of structural foam. The invention contemplates the provision of a valve-like mixing nozzle assembly which is selectively operable to control the flow of plastic material into an injection mold. Significantly, the nozzle assembly includes a mixing turbine rotatably mounted in the flow path of the plastic material. Notably, the turbine is driven by the plastic material itself as the material is driven into the mold assembly, and thus desirably provides intense mixing of the material during injection. This mixing action can be advantageously employed for effecting dispersion and/or expansion of the blowing agent carried by the plastic material for greatly enhanced control and flexibility in molding structural foam articles. Additionally, the illustrated embodiment of the invention includes an arrangement for injecting blowing agent into the plastic material at the mixing nozzle assembly itself, thus offering users of the invention further flexibility for efficiently forming structural foam articles of different configurations.
REFERENCES:
patent: 2943845 (1960-07-01), Jaklitsch
patent: 4134687 (1979-01-01), Eckardt
patent: 4137048 (1979-01-01), Steinman
patent: 4255367 (1981-03-01), Wallace et al.
Introduction to Structural Foam; Stefan Semerdjiev, pp. 1-8, 33-82; Society of Plastics Engineers; 1982.
Structural Foam; Society of the Plastics Industry, Inc.; edited by Bruce C. Wendle; pp. 1-36.
Anderson Philip
Techplastics, Inc.
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