| 摘要 |
PURPOSE:To obtain a mixing screw which has contrived an improvement in color and resin changing properties by improving kneading properties of resin and dispersion performance of pigment and preventing rentention of the resin and pigment, by providing a special stripe groove on an external circumferential surface of a plunger part provided on the screw. CONSTITUTION:A plunger part 2 whose gap with an inner circumferential surface of a cylinder 4 has been made small is provided on a screw and an external circumferential surface of the plunger part 2 is provided with stripe grooves 3A, 3B whose one ends are kept opened and the other ends are kept opened through a groove 5A whose width is smallest under a state wherein the grooves 3A, 3B are noncommucating with each other, in the direction opposite to each other and spiral. |
