发明名称 |
A process for the production of expandable granules of thermoplastic polymers and relative apparatus. |
摘要 |
<p>A process for the production of expandable granules of thermoplastic polymers comprising: a) the extrusion of the polymer in which an expanding agent is incorporated, through a die-head in order to obtain an expandable polymer; b) immediate cooling of this polymer in water, kept at a temperature at which the polymer remains in the non- expanded state, but not lower than the Tg of the expandable polymer; c) cutting of the polymer to granules in water immediately at the outlet of the die-head, and d) annealing of the thus obtained granules, by slow cooling in a temperature range comprised between at least +5°C and at least -5°C the Tg of the expandable polymer, wherein the cooling and the cutting of the polymer to granulaes and the annealing thereof are carried out under pressure.</p><p>The apparatus comprises an extruder; a means for injecting the expanding agent into the extruder; a die-head; a chamber fastened to said die-head and provided with cutter and pipes for feeding water under pressure; a tower for the annealing of the granules and a means for maintaining the pressure in the chamber and in the tower.</p> |
申请公布号 |
EP0126459(A2) |
申请公布日期 |
1984.11.28 |
申请号 |
EP19840105701 |
申请日期 |
1984.05.18 |
申请人 |
MONTEDISON S.P.A. |
发明人 |
BIGLIONE, GIANFRANCO;CIGNA, GIUSEPPE;RINALDI, ROBERTO |
分类号 |
C08J9/16;B29B9/06;B29B13/04;B29C44/34;(IPC1-7):29D27/02 |
主分类号 |
C08J9/16 |
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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