DOUBLE-SCREW EXTRUDED (VERSIONS) Russian patent published in 2001 - IPC

FIELD: processing of thermoplastic materials; industries where extrusion is required. SUBSTANCE: double-screw extruder includes engageable revolving screw located in working chamber and matrix. Working chamber has loading hole, compression and homogenization zones, separating ridges and cylindrical outlet located in homogenization and compression zones and connected with through passage. Rod mounted in this passage is movable in parallel with screw axes. Working end of rod is located in homogenization zone under outlet. According to first version, cylindrical outlet is made in lower ridge for screw revolving towards each other. According to second version, passage with outlet and rod is located in upper and lower separating ridges for rotation in one direction. EFFECT: enhanced stability of pressure in before-matrix zone of extruder at change in technological parameters of process. 3 cl, 4 dwg