Method and apparatus for extruding plastic and similar material
Apparatus for injection foam molding Patent #: 4067673
ApplicationNo. 06/409943 filed on 08/20/1982
US Classes:425/145, Feed control of material en route to shaping area264/40.1, WITH MEASURING, TESTING, OR INSPECTING425/147, By stopping or adjusting flow responsive to material level in collector or mold425/203With separate and distinct gas withdrawal chamber
ExaminersPrimary: Woo, Jay H.
Assistant: Fortenberry, Jill L.
Attorney, Agent or Firm
International ClassesB29C 45/18 (20060101)
B29C 45/76 (20060101)
B29C 45/58 (20060101)
B29C 45/63 (20060101)
Foreign Application Priority Data1981-08-24 JP
AbstractA vent-type plastication molding machine has a material supply rate control system. The reciprocal sliding motion speed of the screw in an axial direction of the heating cylinder is detected by a detector comprising a rack fixed to the reciprocally sliding portion of the machine, a pinion engaging with said rack and rotatably mounted on the stationary portion of the machine, and an electric generator connected with said pinion. The electric power supplied to the material supply means is controlled according to the voltage generated by said generator corresponding to the reciprocal sliding motion speed of the screw through a material supply rate control means comprising an amplifier, a pulse oscillator, sequence controller, a ratio setter and a TRIAC, said ratio setter setting the ratio of the maximum material supply rate to the maximum injection speed as well as the ratio of the maximum material supply rate to the maximum plastication measurement speed based on the amplified voltage signal from said amplifier, one ratio independently of the other. Thus the material is supplied always in a desirable amount so that the clogging of the vent is effectively prevented.