| 摘要 |
An apparatus and method of extruding, injection molding, blow molding and transfer molding plastic materials comprise a feed screw rotating in a barrel and feeding plastic material over a revolving member surrounded by an increasing and a decreasing housing with a discharge opening at its center. The revolving member has an increasing surface with a center line which has a radial distance to the axis of revolution of that member. The revolving member has a subsequent decreasing surface with a center line which has a radial distance to the member's axis of revolution diametral to the radial distance from the center line of the increasing surface to that axis of revolution, so that the forces developed in an area of decreasing surface are compensated by forces in a diametral area of increasing surfaces. The increasing surfaces diverge from each other as do the decreasing surfaces. The increasing housing, the decreasing housing and the revolving member are axially movable relatively to each other to vary the spaced relationship between their surfaces. For extrusion, an extrusion barrel is attached to the decreasing housing, and an extrusion screw to the revolving member. For molding operations, an injection screw or an injection piston extends through a bore in the revolving member coaxial with the member's axis of revolution.
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