Continuous kneading machine

A continuous kneading machine comprising a cylindrical body of which sectional shape is formed of a plurality of circles partially crossover each other, rotaion shafts disposed in said circles in parallel thereto in the same number as said circles, and a number of paddles disposed on said rotation shafts forming a plurality of pairs so as to engage with each other,

• characterized in that sectional shape of one paddle in a section perpendicular to a rotation shaft is formed of n (where n is an integer, and n.gtoreq.2) pairs of major radius parts and minor radius parts which are alternately arranged with equal angle therebetween and formed by a gentle curve, and that sectional shape of another paddle is formed of m (where m is an integer, m.gtoreq.2, and n.noteq.m) pairs of major radius parts and minor radius parts which are formed by an escribed envelope curve drawn by rotation in cooperation with said one paddle, and in which rotation of said another paddle is performed in a direction different from said rotation shaft of said one paddle at a different ratio of rotation frequency.