| 摘要 |
PURPOSE:To offer a compatibility of kneadability and high molding stability by providing a mixing part at least on one of either supply side or extrusion side of the shearing portion. CONSTITUTION:Usually the straight screw having compression ratio 1 is used as the supply part 1, and the compression ratio of compression part 2 is increased up to under 3 by making the groove of screw shallower gradually. The shearing part 3 is of torpedo type, and the molten resin, given resistance in its flow, can be melted and kneaded uniformly in a comparatively short time of shearing. The pressure releasing part 4 necessarily releases the pressure created at the shearing part 3, consists part of the weighing part 5 which is of screw structure carrying compression ratio 2-0.5, weighs the molten resin and relaxes the residual shearing force into the molten resin. The length of weighing part 5 is usually 4-15 times as much as the diameter D of screw, which attains a sufficient relaxation. |
