INJECTION MOLDING MACHINE AND INJECTION MOLDING MACHINE SCREW FOR INJECTING MOLTEN RESIN IN WHICH THERMOPLASTIC RESIN AND REINFORCING FIBERS HAVE BEEN MIXED AND MELTED

摘要

[Problem] The present invention provides an injection molding machine and screw therefor with which, when mixing reinforcing fibers in a molten resin and injection molding same, the reinforcing fibers can be uniformly dispersed in the molten resin.;[Solution] For a screw 7 provided in an injection molding machine 1, a mixing section 17 is provided on the downstream side of a compression section 18. Three helical flights 17a (x, y, z) are provided in the mixing section 17 and three grooves 17b, 17b', which are helically disposed in the opposite or the same direction as the orientation of said flights 17a, 17a', are formed. As a result of said grooves 17b, 17b', it is possible to keep the fiber lengths of the reinforcing fibers long and even if the reinforcing fibers become tangled in the compression section 18, the fibers are defibrated in the mixing section 17, the shearing of long fibers in the molten resin is mitigated, the reinforcing fibers are dispersed uniformly and a good product is obtained.