FIELD: polymer process. SUBSTANCE: extruder sleeve has stepped thread. Centers of steps are on straight line running through center of inner diameter at angle of 40-45 deg. to vertical towards direction of worm rotation. They are located so that center of step adjoining coil pressure face is above center of inner diameter. Projection formed by this step is rounded by radius. Worm in zones of extrusion and plasticization has fine thread with larger flight width. In worm longitudinal hollow with increased diameter fairing with grooves is installed on coolant delivery pipe. EFFECT: higher efficiency of extruder and degree of rubber mixture homogeneity. 2 cl, 3 dwg
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