| 摘要 |
PURPOSE:To prevent the excessive rise and nonuniformity of temperature and kneading of resin from occurring by a structure wherein a plurality of groups of fins are made on the outer periphery of a screw and on the inner periphery of a cylinder at the tip part of a single screw extruder and at the same time the group of fins on the screw side and the group of fins on the cylinder side are alternately arranged axially. CONSTITUTION:By combining groups of fins 14 and 15 at the tip of a screw, raw material is applied by shearing action so strong as applied with a stone mill, which is developed in a double-shaft kneader, in the direction normal to the axis every time the raw material passes the groups of fins 14 of the screw 11 and of fins 15 of a sleeve 13 successively, resulting in bringing the dividing action in the direction normal to the axis into portions represented by the product of the rotational frequency of the screw 11 and the number of flights of a group of fins and the shifting action in the direction normal to the axis. In other words, no maldistribution of raw material resin develops and uniform kneading action can be given to the raw material resin through the combination of the dividing action into portions corresponding to the number of flights of a group of fins, which are parallel to the axis when the raw material resin enters the group of fins 14 of the screw 11 and the group of fins 15 of the sleeve 13, and the kneading action due to the rotation of the raw material within the groups of fins 14 and 15. |
