| 摘要 |
PURPOSE:To improve kneading properties by improving a speed of a flow and pressure at the time when a fixed quantity of molten resin crosses over flights each, by a method wherein at a starting point of formation of a multiple flight, a depth of a screw groove on a resin material feed side is made deeper than that on a semimolten plasticizing resin side and that in a molten plasticizing resin discharge side and the depth of the screw groove is reduced at the fixed rate till a completion point of formation of the multiple flight. CONSTITUTION:A depth of a groove in a compressed part CZ is reduced gradually continuously from a deep groove part to a shallow groove part in an injection direction of resin in a screw groove 2 in a resin material feed side so that H1>H2>H3>H4 is obtained. Then the screw groove 3 in a semimolten plasticizing resin side and a screw groove 4 in a molten plasticizing resin discharge side, which are in a compressed part CZ are made invariable in an injection direction of the resin and they are made into identical depth from each other. The depths of both the grooves 3, 4 in the vicinity of a starting point of formation of the compressed part CZ are made shallower than a depth of the screw groove 2 and the depths of both the grooves 3, 4 in the vicinity of a completion point of formation of the compressed part CZ are made almost identical with a depth of the screw groove 2 in a resin material feed side. |
