发明名称 |
Gear throttle as a nucleation device in a continuous microcellular extrusion system |
摘要 |
Disclosed herein is an improvement in microcellular or supermicrocellular polymer extrusion systems. Both conventional and microcellular systems employ an extruder which plasticates polymer pellets into a polymer melt; a gas metering system, whereby a gas is injected directly in the polymer melt flow in the extruder; a mixing and homogenizing section of the extruder, which creates a single-phase solution of the polymer and the gas; and a nucleation device at the outlet end of the extruder. In this invention, the improvement to the conventional system comprises the nucleation means attached to said extruder which is a gear pump acting as a throttle rather than a pump. With this improvement, the discharge pressure is dictated by die resistance and flow rate as delivered by the gear throttle, and the pressure drop of the polymer/gas single-phase solution is nearly instantaneous.
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申请公布号 |
US6005013(A) |
申请公布日期 |
1999.12.21 |
申请号 |
US19960696650 |
申请日期 |
1996.08.14 |
申请人 |
MASSACHUSETTS INSTITUTE OF TECHNOLOGY |
发明人 |
SUH, NAM P.;HERMANN, TORSTEN |
分类号 |
B29C44/34;B29C44/46;B29C44/60;B29C47/02;B29C47/50;C08J9/12;(IPC1-7):C08J9/00 |
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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