Title: Injection molding apparatus

Abstract: The invention is concerned with an injection molding apparatus in which thermoplastic material mixed with an expanding agent is kept in a plastic state below the reaction temperature of the agent and is passed generally continuously through an inter-connecting passage to a transfer cylinder; by flowing through the passage, the mass is heated above the reaction temperature and the built-up pressure prevents foaming of the thermoplastic until it is injected into a mold.

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Inventors: Alwes, Dieter (Hilchenbach-Dahlbruch, DT)
Eckardt, Helmut (Hilchenbach-Dahlbruch, DT)
Leiste, Hans Peter (Kirchhundem, DT)
Melcher, Robert Albert (Wenden-Gerlingen, DT)

Application Number: 395124
Filing Date: 1973-09-07
Publication_date: 1976-02-10
Assignee: Siemag Siegener Maschinenbau GmbH (Hilchenbach-Dahlbruch, DT)
Primary Class(es): 366/79 264/54, 264/68, 264/DIG83, 366/142, 366/145, 366/601
Other Classes:
US Patent Ref:

3385671	May, 1968	Axelsson	259/8.
3728053	Apr, 1973	Stillhard	259/191.
3795386	Mar, 1974	Carter	259/191.
3822057	Jul, 1974	Wheeler	259/191.
3825235	Jul, 1974	Walter	259/191.

Other Refs:
Primary Examiner: Jenkins, Robert W.
Assistant Examiner:
Attorney: Blodgett; Norman S., Blodgett; Gerry A.