公开(公告)号：WO1996018483A1

公开(公告)日：1996-06-20

申请号：PCT/US1995015555

申请日：1995-12-04

申请人： E.I. DU PONT DE NEMOURS AND COMPANY

发明人： E.I. DU PONT DE NEMOURS AND COMPANY ,  CORCORAN, William, Robert, Jr.

IPC分类号： B29B09/06

CPC分类号： B29B9/06 ,  B29B13/045

摘要： A pelletizer particularly useful for pelletizing water-dispersible melt-extrudate, among other materials, delivered from an extruder through a die positioned in communication with the interior of the pelletizer housing. The pelletizer includes a rotor disposed inside the housing and knives mounted around the periphery of the rotor. The knives pelletize the melt-extrudate as the rotor rotates. A fluid supply system selectively delivers a fluid, such as air, to the knives when the knives are at a selected location in the housing. The selected location is preferably just past the inlet and can extend in a circumferential direction around the housing in the area of the housing which is near the outlet. The circumferential extent can vary according to the configuration of the knives and the fluid supply system. The fluid supply system supplies fluid in a radially outward direction and tangentially along the cutting edge of the knives so as to sweep the pellets from the knives, as well as cool the knives, the pellets and the interior components of the pelletizer. The selective delivery of fluid sweeps the pellets off the knives as close to the outlet as possible. This prevents fouling, as well as avoids undesirable cooling of the knives in proximity to the die, which could lower the temperature and interrupt the flow of the extrudate.

摘要翻译： 特别可用于造粒水分散性熔融挤出物的造粒机，以及其它材料，其通过与造粒机壳体内部连通的模具从挤出机输送。 造粒机包括设置在壳体内的转子和围绕转子的周边安装的刀。 当转子旋转时，刀将熔体挤出物造粒。 当刀具在壳体中的选定位置时，流体供应系统选择性地将诸如空气的流体输送到刀具。 所选择的位置优选地刚刚超过入口，并且可以在靠近出口的壳体的区域中围绕壳体在圆周方向上延伸。 圆周范围可以根据刀具和流体供应系统的配置而变化。 流体供应系统沿着径向向外的方向并且沿着刀的切割刃切向地供应流体，以便从刀具中清除颗粒，以及冷却造粒机的刀，丸粒和内部部件。 液体的选择性输送将刀片尽可能靠近出口排出刀具。 这防止了结垢，并且避免了在模具附近的刀具的不期望的冷却，这可能降低温度并中断挤出物的流动。