06051174 is referenced by 46 patents and cites 42 patents.

An extrusion system for providing a foamed material in which a material such as a polymer material is supplied to an extruder for movement through a rotating screw member. The material is placed in a molten state and a foaming agent, such as a supercritical fluid, is introduced into the extruder at a selected pressure so that a two-phase mixture of the molten material and the foaming agent is formed. The foaming agent is then diffused into and dissolved in the molten material to form a single-phase solution which is forwarded from a solution formation to a nucleation device. A thermodynamic instability is induced through a rapid pressure drop, e.g., higher than 0.9 GPa/s in the nucleation device to nucleate microcells in the solution. A further shaping device, e.g., a die, can be used to produce a foamed material of a desired shape.

Title
Method for providing continuous processing of microcellular and supermicrocellular foamed materials
Application Number
147789
Publication Number
6051174
Application Date
January 8, 1999
Publication Date
April 18, 2000
Inventor
Daniel F Baldwin
Medford
MA, US
Nam P Suh
Sudbury
MA, US
Chul B Park
Mississauga
CA
Agent
George W Dike Bronstein Roberts and Cushman Neuner
Assignee
Massachusetts Institute of Technology
MA, US
IPC
B29C 44/20
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