Title:
THERMOPLASTIC FOAM EXTRUSION ASSEMBLY
Document Type and Number:
WIPO Patent Application WO2002020232
Kind Code:
A3
Abstract:
A foam extrusion assembly having a melt region which melts material pellets, an agent addition assembly which adds a foaming agent to the pellets, and a mixing assembly which mixes the pellets and the agent with one another. The mixing assembly includes an elongated barrel through which the pellets and the agent are urged from an inlet to an outlet of the barrel. The mixing assembly includes a mixing plug disposed in the barrel passages along a length thereof, the flow passages, which are structured and disposed to receive the pellets and the agent therethrough so as to define a flow path past the mixing plug, each have at least one small transverse dimension so as to restrict amounts of the pellets and the agent which enter the flow passage at one time, and are short in length as to minimize a duration of a flow restriciton at the flow passages.
Inventors:
FOGARTY JAMES D (US)
Application Number:
PCT/US2000/024361
Publication Date:
May 06, 2004
Filing Date:
September 01, 2000
Export Citation:
Assignee:
FOGARTY JAMES D (US)
International Classes:
B29C44/34; B29C48/395; B29C48/67; (IPC1-7): B29C47/64
Foreign References:
| US4376741A | 1983-03-15 | |||
| US5630968A | 1997-05-20 |
Other References:
See also references of EP 1438166A4
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