Abstract: The present invention provides a mixer, especially adaptable for admixing solid plastic particulate, and with one or more additives, comprising a substantially horizontally disposed cylinder, slightly inclined with respect to the horizontal plane, and an inlet and outlet disposed above and below, respectively, the horizontal plane. A plurality of impellers depend radially from a horizontally disposed driven shaft, each impeller terminating outwardly with an enlarged planar surface obliquely angled relative to the radial plane and in the direction of rotation. A portion of the radial edge from the angle outwardly is tapered inwardly relative to the radial axis.