How to choose screw for injection molding machine?

First of all, we need to determine the parameters: length-to-diameter ratio, compression ratio, diameter, pitch, length, commonly used parameters such as the model of the model used, the number of cymbals, and the materials used. According to the difference of each model, each material used will be different. Different materials are selected according to the materials, such as the speed of melting, the heat performance absorbed during melting, melt viscosity, water absorption, and thermal stability. Each has its own differences, and the shape requirements of the plasticizing screw of the injection molding machine are very different. Even for the same plastic, because of different products, the flame retardants, lubricants, glass fibers, inorganic minerals and other modifiers and fillers added to the plastic are different, or the requirements for color mixing and melt homogenization are different. Different shapes of granular materials have different requirements on the screw to choose.