Injection molding of PET/PE, one of immiscible thermoplastic composites, was carried out with original novel mixing nozzles equipped with torpedoes. An ability of the nozzles to promote plasticizing and mixing of dry-blended PET/PE to achieve high performance as same as a melt mixed composite was investigated. Mixing of dry-blended PET/PE was promoted by high shear effect of the mixing nozzle with a torpedo which allowed homogeneous and fine dispersion. The dispersion structure was equal to that made using a twin-screw extruder with high ability to knead materials. When a torpedo which has barriers and grooves was used, a fine dispersion structure was also obtained by its effect of distribution and collision of materials.
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