1973-09-07
1976-02-10
Jenkins, Robert W.
259 8, B29B 110
Patent
active
039374475
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.
REFERENCES:
patent: 3385671 (1968-05-01), Axelsson
patent: 3728053 (1973-04-01), Stillhard
patent: 3795386 (1974-03-01), Carter
patent: 3822057 (1974-07-01), Wheeler
patent: 3825235 (1974-07-01), Walter
Alwes Dieter
Eckardt Helmut
Leiste Hans Peter
Melcher Robert Albert
Blodgett Gerry A.
Blodgett Norman S.
Jenkins Robert W.
Siemag Siegener Maschinenbau GmbH
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