METHOD FOR PROCESSING OF RUBBER MIXES BY EXTRUSION, SHEARING ROLL HEAD AND EXTRUDER FOR REALIZATION OF PROCESS Russian patent published in 1996 - IPC

FIELD: processing of rubber mixes. SUBSTANCE: rubber mix is processed by mixing it with shearing deformation, dissipative heating and forcing through a jet. Concurrently with dissipative heating, gaseous substances are removed at temperature equal to vulcanizing temperature. The method can be realized with the aid of a shearing roll head. The latter is provided with a material dissipative heating unit in the form of a mixing rotor installed between the roll pair and the distributing worm provided with support rolling-contact bearings. The latter are mounted with a provision for contacting the working surface of the mixing rotor. The dissipative heating unit has a gas-discharge chamber in the form of a row of racks mounted in a drawout housing pressed against the mixing rotor by an eccentric clamp with springs and made as a thin-walled member of low stiffness from a flexible material. The head has a seal of molding chamber of an extended shape with a cooling tube and a convex wall at the side of the molding chamber. The seal of the lower roll is made of textile and capron fibers combined in a shell. The latter is filled with a sealing liquid. The extruder for processing of rubber mixes has a grinding-and-heating mechanism enclosed into a pressure-tight housing with a gas discharge chamber and disposed between the worm and a gear pump which incorporates a tempered liner in its casing, with spiral channels on the inside surface and with outlets into the intake pockets of the casing. The grinding-and-heating mechanism is a rotor accommodated in the casing of a mechanism threaded inside and provided with a slot for the escape of material into the gas discharge chamber. The outlet side of the slot is provided with a rack having a heat-insulating gasket, and a gate. The latter is installed movably and is capable of closing rack grooves. The casing walls are extensible. EFFECT: intensified process of gas discharge, higher quality of mix and of finished products, and increased efficiency of process. 8 cl, 6 dwg