As one of the key equipment of polymer production and processing, the screw of plastic packing belt machine is widely used in polymer production and processing industry, and will be widely used in other industries. Labeling plastic packaging machine screw work performance in the key performance parameters are: screw diameter, screw length to diameter ratio, speed ratio of the screw is category, drag the main screw motor output power, machinery and equipment production, the heating output power of the cylinder, and according to the section number, the equipment management center of height to width ratio and size, etc., the main parameters is the key to the considerations and plastic packaging machine according to the design is plastic packaging machine first need to clear the performance parameters of the screw.
Optimal design of screw of plastic packing belt machine
According to the whole process of the transformation of the polymer in the three physical conditions of the screw of the unlined paper aluminum foil tape machine, and the working standards of each position of the screw, the screw of the plastic packing tape machine is generally divided into feeding section, melting section and metrological verification section. Because the geometrical structure of the screw is relatively complex, it is impossible to create a mathematical analysis model that can fully reflect the optimal design of the screw of the plastic packing machine. Even if we can create an ideal mathematical analysis model for the optimization design of the screw of plastic packaging belt machine, it is also very difficult to find out because of the numerous hazard elements and the many independent variables of the design scheme. Therefore, it is more practical to carry out the optimization design according to the action segment model of the screw.
The basic theory and method of screw optimization design of plastic packing machine
At present, the common optimization design methods of plastic packing machine screw include: analytical method, graphic method and computer simulation method. On the basis of the status of the extrusion process to create a physical model, based on the physical model to create mathematical analysis model, selection of Pro/E, ANSYS, Polyflow, such as mobile phone software Matlab to write process optimization design program, the program flow type electronic computer and according to the changes to optimize the overall goals of the assignment to carry out the optimization calculation, according to the results of the optimization of electronic computer output for parsing and certification, calculate the main parameters for optimizing the design of plastic packing machine.
The mathematical analysis model of the analytical form depends on the understanding of the working condition and the basic theory of the component to a great extent, besides the overall objective of the predetermined optimization. A schematic design can be expressed by the scalar values of a set of major parameters. Among them, the single main parameters that must be selected are called design scheme variables. Because the main parameters such as screw diameter, length-diameter ratio, external screw rising Angle and screw groove depth are related to the bearing capacity of the screw, production, driving force consumption, extrusion quality, and the performance of the screw machine, it is generally selected as the independent variable of the design scheme. The characteristics of optimal design of waterborne kraft paper tape machine screw are: design scheme independent variables; Multi-objective optimization design coexists with single-objective optimization design. Multidimensional and discrete systems of mathematical analysis models; Various dimensions coexist in the independent variables of the design scheme.
Optimal design of screw of single plastic packing belt machine
Tian PuJian from single plastic packaging machine screw extrusion process, basic theory, extrusion screw structure and main parameter of screw geometry melting performance, specifically consider screw melt quality specification, performance and to optimize the overall objectives, in polypropylene (PP)/natural bamboo powder as an example, the geometry of screw main parameters optimization. It is concluded that the special screw of WPC is more beneficial to the transportation of WPC melt than the general screw of plastic, and it can prevent a series of problems caused by the increase of WPC melt viscosity. The dimensions of the elements harmful to the working pressure field in the verification section of raw material melting measurement are successively as follows: the deep depth of the screw groove, the rising Angle of the external thread and the total width of the screw edge. If the deep depth of the screw groove is enlarged and the rising Angle of the external screw thread is reduced, the necessary energy consumption of the metering verification section can be reasonably reduced. The larger the depth of the screw groove, the smaller the lifting Angle of the external thread, the smaller the forward friction resistance of the melt, and the lower the kinetic energy consumed by the transportation of the melt in the metering verification section. With the increase of the total width of the screw edge, the kinetic energy consumed by the melt transportation in the measurement verification section has a trend of increase, but the trend of increase is relatively slow. If the total width of the screw is increased too much, the driving force cost on the screw will also be increased, and there will be a risk of partial overtemperature. The total width of the screw should be controlled in a certain suitable category. The use of Pro/E analysis system, finally identified the most suitable plastic packaging belt machine screw elements, and then exceed the purpose of improving productivity.
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