The method of strengthening laminar mixing in single screw extruder with PVC hose machine?

Research progress of laminar mixing mechanism of polymer melt in PVC hose machine in single screw extruder. PVC pipe manufacturers analyzed and summarized the measures to improve the mixing, and pointed out the methods to further strengthen the mixing effect.
The process involves stretching the streamline, folding and redistributing the geometric space. In the case of multiple components, it usually means that the components are destroyed and accompanied by the diffusion of energy. The flow behavior of polymer melt is between pure elastic solid and high viscosity fluid, and there are normal stress and shear thinning characteristics which are very difficult to mix. Therefore, how to make PVC processing equipment achieve excellent mixing effect under low energy consumption has been the goal of people. It is generally believed that the mixing of polymer system mainly occurs in the processing of melt conveying part, and the strong mixing process starts from trying to change the structure of melt conveying part.
The results of mixing are distributed in two aspects. Among them, the research of distribution mixing is much deeper. The interface of the surface system with large strain and random orientation increases to half of the total shear strain under simple shear. In addition, Pinto and Tadmor proposed to characterize the weighted average total strain of mixing in a single screw extruder. Because the single screw extruder is shear drag supercharged conveying, the melt in the screw groove must be mixed in regular flow, which means that the interface grows linearly with the strain, and the interface between the layers.