发明名称 |
Method for providing continuous processing of microcellular and supermicrocellular foamed materials |
摘要 |
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.
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申请公布号 |
US6051174(A) |
申请公布日期 |
2000.04.18 |
申请号 |
US19990226907 |
申请日期 |
1999.01.08 |
申请人 |
MASSACHUSETTS INSTITUTE OF TECHNOLOGY |
发明人 |
PARK, CHUL B.;SUH, NAM P.;BALDWIN, DANIEL F. |
分类号 |
B29C44/34;B29C44/46;(IPC1-7):B29C44/20 |
主分类号 |
B29C44/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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