| 摘要 |
PURPOSE:To improve remarkably the kneading property of a screw by a method in which the depth of resin-feeding screw groove and the depth of the screw groove of semimolten plasticized resin are gradually reduced continuously, and the depth of resin-feeding screw groove is made deeper than the depth of the screw groove of semimolten plasticized resin and the depth of the screw groove of the discharging side of molten plasticized resin. CONSTITUTION:The solid resin moved from feeding part FZ is damper up at a first auxiliary flight beta1, and with the rotation of a screw 1, a molten film is formed between a cylinder 5 and the solid resin by its strong shearing action, and then the fusion of the surface of the solid resin is quickly accelerated by the shearing force of the molten film. Further, since the gap Z2 between the cylinder barrel 5 and a second auxiliary flight beta2 is less than the gap Z1 between the cylinder barrel and the first auxiliary flight beta1 when the resin gets over the second auxiliary flight beta2, and further the screw groove 3 of semimolten plasticized resin and the screw groove 4 of the discharging side are shallow, the molten resin which gets over the first auxiliary flight beta1 and is moved receives more shearing energy by the rotation of the screw 1, and the resin is perfectly melted, whereby kneading property is improved. |
