Continuously operable mixing and kneading device

Claim 1

A continuously operating mixing and kneading apparatus adapted for uniformly blending powdered plastics and cut pieces of plastic to continuously feed a calender, comprising: a first cylindrical vertical casing having a worm disposed axially thereof on a shaft; a first conical feed hopper projecting from an open end of said first casing through which said shaft extends along a longitudinal axis thereof; said shaft carrying bar members at the top of said feed hopper and further carrying radially inclined blades at below said bars to assist in feeding the materials to be mixed to said worm which rotates; and an additional feeding means communicating at right angles with the base portion of said first conical feed hopper which brings a second stream of material into the upper part of said worm, said additional means including a horizontal casing, a second worm, a collar connecting said horizontal casing to said vertical casing with an opening in said collar providing communication between said vertical casing and said horizontal casing, and a second feed hopper, said second worm rotating radially in respect to said first worm of said first casing, whereby the movement of said first worm uniformly and smoothly conveys the proportions of materials delivered to it by said second worm while the rotational movement of said bars and said inclined blades on said first shaft assist smooth and uniform feeding.