| 摘要 |
PURPOSE:To enable to highly efficiently extrude favorable extrudate by a structure wherein a kneading section, in which multiple forward flights and multiple backward flights are opposedly arranged on both sides of a plane containing the axis center line of a screw so that both ends of each flight of the forward or backward flights locate corresponding to the groove between the flights of the other multiple flights. CONSTITUTION:Solid raw material supplied to a cylinder is pre-heated at a supplying section A, transferred to a fusing section B and, after being fused, sent to a metering section C so as to enter in a kneading section D. At the kneading section D, fused body is transferred forwards and simultaneously kneaded by the tractive flow developed with the rotation of a kneading screw 1 in forward screw grooves 16, 17, 18, 19 and 20. Further, the fused body is similarly transferred backwards and simultaneously kneaded in backward screw grooves 21, 22, 23, 24 and 25. Thus, while being repeatedly or at least twice subject to kneading action with fused bodies in the screw grooves before and after in one screw groove, the fused body is transferred forwards and finally extruded while being uniformized in a screw groove 3, which is made by a flight 2 formed at the tip of the melting section. |
