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    • 34. 发明申请
    • Method and Device for Granulating Plastics and/or Polymers
    • US20090115091A1
    • 2009-05-07
    • US11884462
    • 2006-02-15
    • Michael ElooJuergen Heinz Veltel
    • Michael ElooJuergen Heinz Veltel
    • B29B9/06
    • B29C47/92B29B9/06B29B9/065B29C47/0011B29C47/0066B29C47/0872B29C47/864B29C2793/0027B29C2947/92B29C2947/92019B29C2947/92209B29C2947/9238B29C2947/92514B29C2947/926B29C2947/92609B29C2947/92704B29C2947/92961G05D7/0617Y10T137/87877
    • The present invention relates to a method for the pelletization of plastics and/or polymers, wherein a melt coming from a melt generator is supplied via a diverter valve having different operating positions to a plurality of pelletizing heads through which the melt is pelletized. The invention furthermore relates to a pelletizing apparatus for the pelletization of plastics and/or polymers having a diverter valve which has at least one melt generator connection, at least two pelletizer connections as well as a switching gate for selectively connecting the melt generator connection to at least one of the pelletizer connections, with a respective pelletizing head being connected to the at least two pelletizer connections and a melt generator having a variable melt volume flow being connected to the melt generator connection. Finally, the invention also relates to a diverter valve for such a pelletizing apparatus having a melt generator connection, a pelletizer connection as well as a melt passage for the connection of the melt generator connection to the pelletizer connection. The present invention therefore starts from the idea of using a plurality of pelletizing heads with different passage capacities and of hereby enlarging the throughput window to be able to work largely continuously without intermediate interruptions and to shorten unavoidable start-up processes by switching in pelletizing heads having small throughput capacities or to minimize them with respect to the start-up products which occur. In accordance with an aspect of the present invention, a plurality of pelletizing heads having different throughput capacities are used sequentially for the start-up of the pelletizing process, with the melt first being supplied to a first pelletizing head having a smaller throughput capacity and then the melt volume flow being increased and the diverter valve being switched over such that the melt is diverted by the diverter valve to a second pelletizing head having a larger throughput capacity. The time and thus the amount of the start-up product until the melt generator reaches the lower throughput limit of the pelletizing head and the pelletizing process can be started are cut by the use of initially one pelletizing head having a throughput capacity which is as low as possible. No further start-up product is incurred from the start onwards of the pelletizing process at the lower throughput limit of the said first pelletizing head. The melt volume flow is increased quantitatively for so long until the diverter valve can be switched to the second pelletizing head having the larger throughput capacity with no start-up product being incurred during this time period. Moreover, the throughput window is enlarged in total so that the number of unavoidable start-up procedures with start-up product arising therein is reduced since it is possible, on a ramping down of the melting performance below the lower throughput limit of the larger pelletizing head which may become necessary for various reasons, to switch back to the first pelletizing head.
    • 38. 发明授权
    • Method of and apparatus for controlling the viscosity of molten plastics
material which is to be moulded
    • 用于控制待模塑的熔融塑料材料的粘度的方法和装置
    • US4213747A
    • 1980-07-22
    • US961198
    • 1978-11-16
    • Reinhard Friedrich
    • Reinhard Friedrich
    • B29B7/00B29C47/00B29C47/92B29F3/06
    • B29C47/92B29C47/367B29B9/065B29C2793/0027B29C2947/92019B29C2947/92028B29C2947/92095B29C2947/922B29C2947/92209B29C2947/92314B29C2947/92466B29C2947/92485B29C2947/92571B29C2947/9259B29C2947/92609B29C2947/92695B29C2947/92704B29C2947/92809B29C2947/92895B29C2947/92961B29C2947/92971B29C2947/9298B29C47/0009B29C47/0011B29C47/0066B29C47/0872B29C47/864
    • A plastics extruder in operative association with a control arrangement is disclosed. The plastics extruder includes a screw extruder, a screen downstream of the screw extruder, a throttle located between the screw extruder and the screen, a moulding tool downstream of the screen, and a melt index measuring device. The measuring device includes a metering pump whose rotational speed is controllable and which is provided with a rotational speed indicator, a measuring nozzle disposed in a sample flow channel, and pressure and temperature sensors connected to the sample flow channel directly upstream of the inlet of the measuring nozzle. The sample flow channel is adapted to be located downstream of the screen pack and upstream of the moulding tool. For the purpose of regulating the viscosity of the plastics material melted in the screw extruder, the throttle cross-section is variable by a servomotor connected to the output of a programmable two-coordinate controller. The characteristic of the controller provides a desired value output and can be predetermined as a temperature-pressure characteristic when the metering pump is operated with constant delivery, or as a temperature-delivery characteristic when the metering pump is operated with a constant pressure drop via the measuring nozzle while the temperature sensor is connected to one of two actual value inputs of the two coordinate controller. Either the pressure sensor or the rotational speed indicator is connected to the second actual value input.
    • 公开了一种与控制装置有效关联的塑料挤出机。 塑料挤出机包括螺杆挤出机,螺杆挤出机下游的筛网,位于螺杆挤出机和筛网之间的节流阀,筛网下游的成型工具和熔体指数测量装置。 该测量装置包括一个计量泵,其旋转速度是可控制的,并且设置有转速指示器,设置在样品流动通道中的测量喷嘴,以及连接到样品流动通道的压力和温度传感器, 测量喷嘴。 样品流动通道适于位于筛网组件的下游和模制工具的上游。 为了调节在螺杆挤出机中熔化的塑料材料的粘度,通过连接到可编程双坐标控制器的输出的伺服电动机可以改变节流截面。 控制器的特性提供期望的值输出,并且可以预定为当计量泵以恒定的输送操作时的温度 - 压力特性,或者当计量泵通过恒定的压降操作时的温度传递特性 测量喷嘴,同时温度传感器连接到两个坐标控制器的两个实际值输入之一。 压力传感器或转速指示器都连接到第二个实际值输入。
    • 39. 发明授权
    • Adjustable die face pelletizer
    • 可调模面造粒机
    • US3973890A
    • 1976-08-10
    • US553296
    • 1975-02-26
    • Carter E. PorterRichmond S. ParsonsPaul H. Rossiter
    • Carter E. PorterRichmond S. ParsonsPaul H. Rossiter
    • B29B9/06B29C47/30B29C47/70B29F3/08B29F3/06
    • B29C47/70B29B9/065B29C47/30B29C2793/0027B29C2793/009B29C47/0011B29C47/0066B29C47/0872B29C47/864
    • The cutter used with a cylindrically shaped die plate means on a thermoplastic extruder is rotatable about the axis of the die plate and has a plurality of radially projecting blades that extend longitudinally and sweep across the downstream face of the die plate means as the cutter rotates severing extruded heat-plastified material into pellets. The blades form continuous longitudinal channels within which the pellets collect as the cutter rotates. The cutter is enclosed to permit pellet treatment fluid to flow longitudinally over the cutter and flush the pellets from the channels as soon as the pellets are severed. The die plate means comprises a pair of nested die plates mounted for selective positioning relative to one another. In one relative position, the orifices in the plates are essentially aligned to offer minimum constriction to the extrusion of heat-plastified material through the orifices. Adjusting means is provided to selectively change the relative position of the die plates to maintain a substantially constant pressure of heat-plastified material upstream of the die plate means.
    • 与热塑性挤出机上的圆柱形模板装置一起使用的切割器可绕模板的轴线旋转,并且具有多个径向突出的叶片,当切割器旋转切割时,该叶片纵向延伸并且横过模板装置的下游面扫过 将热塑化材料挤压成粒料。 叶片形成连续的纵向通道,当切割器旋转时,颗粒收集在该纵向通道内。 切割器被封闭以允许颗粒处理流体在切割器上纵向流动并且一旦颗粒被切断就从通道冲洗颗粒。 模板装置包括一对嵌套模板,用于相对于彼此进行选择性定位。 在一个相对位置中,板中的孔基本上对齐,以通过孔口对热塑化材料的挤出提供最小的收缩。 提供调节装置以选择性地改变模板的相对位置,以保持模板装置上游的热塑化材料的基本恒定的压力。