Influence Of Main Factors On Conveying Of Solid In Co-Rotating Twin Screw Extruder

Co-rotating twin screw extruders are playing more important role in polymer processing for their excellent transmission capacity, self-cleaning and mixing property. At present, there are a lot of literatures on melting and melting convey, but few articles on the stuty of solid convey especially on factors of output and power, lack of equation in solid convey zone.In this study, RSM(Response surface methodolygy) experiment were designed to form equation of solid convey, in the experiment design, solid pellets, powders, long-fiber materials and high inorganic powder fillers are were used, output of solid convey and power were choosed as objective functions while operating parameters, structural patameters of screw element and materials paratemeters were choosed as effective factors. After experiments analysis and research, quadratic multinomial equations of output and power equations were built, from these equations, effect of main factors and their corresponding relationships were discussed.Based on experiment studies, solid convey equations onφ34 single lead configuration and vary lead configurations of four materials were built by mathematical molding method. These equations were highly accurate and could excellently predicted the practical output and power consumption, forecast accuracy of all these equations are more than 90% and some of them could be more than 95%.From results of research, some conclusions can be derived:in the solid pellets convey, when using single lead configuration, the main factors on power and output were respectly helix angle and diameter of pellets, when using vary lead configuration, solid block would appear, so vary lead configuration were not suitable in solid pellets convey; in powder convey, whatever using two configurationss, the main factor on output was rotating speed, while the main factors on power were respectively helix angle of screw elements and rotating speed, it showed that compared to vary lead configuration, single lead configuration had harder transmission capacity and lower power consumption; in convey of long-fiber materials, when using single lead configuration, the main factors on output and power were respectively filling rate and helix angle of screw element, when using vary lead configuration, main factors on output and power were both rotating speed, compared to single lead configuration, vary lead configuration had harder transmission and higher power consumption; in convey of high inorganic powder fillers, when using single lead configuration, the main factors on output and power were repectively filling rate of screw elements and rotating speed, when using vary lead configuration, main factors on output and power were both rotating speed, compared to single lead configuration, vary lead configuration had harder transmission capacity and higher power consumption.