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    • 9. 发明授权
    • Back pressure control for an injection molding machine
    • 注塑机的背压控制
    • US06371748B1
    • 2002-04-16
    • US09340503
    • 1999-07-01
    • Hitoshi Hara
    • Hitoshi Hara
    • B29C4577
    • B29C45/77B29C2045/1792B29C2045/5032B29C2945/76006B29C2945/76083B29C2945/76187B29C2945/76287B29C2945/76367B29C2945/76498B29C2945/76665B29C2945/76846B29C2945/76943
    • In a back pressure control apparatus for controlling back pressure in an injection molding machine comprising an injection device which comprises a heating cylinder, a screw, and an injection actuator and which is provided with a back pressure detector for producing a pressure detected signal and with a screw position detector for producing a screw position detected signal, the back pressure control apparatus comprises a level setting section for setting a back pressure control level with respect to back pressure. A sharpness selecting section selects, as a selected sharpness, one of a plurality of sharpnesses in transition up to a maximum back pressure command value. On the basis of the back pressure control level, a determining section determines a back pressure pattern having a variable back pressure command value which continuously changes with respect to a retreat position of the screw. The back pressure pattern has a mountain-shaped portion defined by the selected sharpness. Responsive to the pressure detected signal and the screw position detected signal, a controller controls the back pressure in accordance with the back pressure pattern by means of the injection actuator.
    • 一种用于控制注射成型机中的背压的背压控制装置,包括:注射装置,该注射装置包括加热缸,螺杆和注射致动器,并且设置有用于产生压力检测信号的背压检测器, 用于产生螺杆位置检测信号的螺杆位置检测器,所述背压控制装置包括用于设定相对于背压的背压控制水平的液位设定部。 锐度选择部分选择转换中的多个锐度中的一个直到最大背压指令值为选择的锐度。 基于背压控制水平,确定部确定具有相对于螺杆的后退位置连续变化的可变背压指令值的背压模式。 背压图案具有由所选锐度限定的山形部分。 响应于压力检测信号和螺杆位置检测信号,控制器通过注射致动器根据背压图案来控制背压。
    • 10. 发明授权
    • Injection molding method
    • 注塑法
    • US5049327A
    • 1991-09-17
    • US360933
    • 1989-03-17
    • Hitoshi HaraYorikazu Takeichi
    • Hitoshi HaraYorikazu Takeichi
    • B29C44/04B29C44/34
    • B29C44/0407B29C44/34
    • An injection molding method for forming molded products of foamed plastics, in which molten resin mixed with foaming agent which begins foaming after being kept at a required temperature for a required time is injected into a metal mold wherein the foaming agent mixed together with the molten resin is solidified in a body in the metal mold under such conditions that the portion of the foaming agent molten resin mixture which is in contact with the inner surface of the metal mold is accordingly cooled rapidly such as to substantially prevent foaming thereof, so that the appearance of the molded product is finished neatly, while the foaming agent/molten resin mixture in the inner part of the mold is cooled gradually so that the temperature thereof is not rapidly decreased, under conditions wherein the foaming agent begins foaming and the inner portion of the molten resin is therefore expanded from inside owing to the foaming pressure, which expansion substantially prevents the occurrence of depressions in the surface of the molded product which might otherwise be caused due to shrinkage upon cooling of the resin.