| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection apparatus for an injection molding machine suppressed in increase of the total height and width, an injection molding method capable of preventing molten resin from being reversed and flowed into resin flow passages which are not related to each process in plasticizing, metering, and injection filling processes, and a resin replacing method facilitating resin replacement.SOLUTION: A screw has a coaxial double screw structure, and an inner second screw 17 is projected backward from an outer first screw 16 so that a first resin flow passage 10 and a second resin flow passage 11 are formed on each of the screws respectively. By a communication resin flow passage 21 communicating the first resin flow passage 10 and a space located closer to an injection nozzle 13 side than a reverse flow preventing ring 18 of the second screw 17 and a resin flow passage opening and closing mechanism 22 provided in the communication resin flow passage, the resin material plasticized in any of the resin flow passages can be metered, injected, and filled by the second screw 17 with the reverse flow preventing ring 18 provided thereon. |
