Plastic injection moulding machine with automatic

专利名称：Plastic injection moulding machine with

automatic shut-off valve

发明人：Durina, Michael F.申请号：EP92118838.9申请日：19921104公开号：EP01048A1公开日：19930512

专利附图：

摘要：A plastic extruder comprising a rotating helical screw within a cylindrical shell(10). An automatic shut-off valve (24) is mounted at the forward end of the helical screw.The valve includes a valve body (34) and a poppet (36) which is axially movable and isrotatable relative to the valve body. A rearwardly extending axial bore (48) is provided atthe forward end of the screw and the valve body is secured to the screw within said bore.The poppet has an axial stem (60) which extends through the valve body into the axialbore. A compression spring (52) is mounted on the rearward end of the stem to urge thepoppet against the valve body and maintain the valve in a normally closed position. Flowof plastic through the valve upon rotation of the screw causes the valve to open.However, the valve automatically closes upon cessation of screw rotation to prevent

back-flow of plastic during the injection step.

申请人：SPIREX CORPORATION

地址：8469 Southern Boulevard Youngstown Ohio 44512 US

国籍：US

代理机构：Zenz, Joachim Klaus, Dipl.-Ing.

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