| 摘要 |
PROBLEM TO BE SOLVED: To enhance extrusion efficiency without generating the mixing with a non-molten resin or vent-up by constituting the screw of the first kneading zone of a biaxial rotary extruder by a combination of two kinds of kneading discs respectively specified in nondimensional pressure gradient. SOLUTION: A powdery resin extruder is set to a biaxial rotary type obtaining sufficient feed force to a powder resin and the screw constitution of a first kneading zone is composed of a combination of kneading discs A, B. In the kneading disc (A), a ratio L/D of the length L and diameter D thereof is set to 0.5-2 and the nondimensional pressure gradient at a time of 0.01 in nondimensional extrusion quantity is set to 0-10. In the kneading disk (B), nondimensional pressure gradient at a time of 0.01 in nondimensional extrusion quantity is set to 0-1,000. By this combination, proper kneading pressure is obtained and extrusion efficiency can be enhanced without generating trouble. |
