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    • 5. 发明授权
    • Process for the production of expandable granules of thermoplastic
polymers and relative apparatus
    • 用于生产热塑性聚合物可膨胀颗粒和相关设备的方法
    • US4606873A
    • 1986-08-19
    • US610823
    • 1984-05-16
    • Gianfranco BiglioneGiuseppe CignaRoberto Rinaldi
    • Gianfranco BiglioneGiuseppe CignaRoberto Rinaldi
    • C08J9/16B29B9/06B29B13/04B29C44/34C08J9/12
    • B29C44/3461B29B13/045B29B9/065
    • 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.degree. C. and at least -5.degree. C. the Tg of the expandable polymer, wherein the cooling and the cutting of the polymer to granules and the annealing thereof are carried out under pressure.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.
    • 一种用于生产热塑性聚合物的可膨胀颗粒的方法,包括:(a)通过模头挤出其中引入发泡剂的聚合物,以获得可发性聚合物; (b)将该聚合物立即在水中冷却,保持在聚合物保持处于非膨胀状态但不低于可发性聚合物的Tg的温度; (c)立即在模具头出口处将聚合物切割成水中的颗粒,和(d)通过在至少+5℃和 至少-5℃,可膨胀聚合物的Tg,其中聚合物对颗粒的冷却和切割以及其退火在压力下进行。 该设备包括挤出机; 用于将发泡剂注入挤出机的方法; 一个死头 固定在所述模头上的腔室,并设置有用于在压力下供水的切割器和管道; 用于颗粒退火的塔和用于保持室中和塔中的压力的​​装置。