First of all, we have to determine the parameters: length to diameter ratio, compression ratio, diameter, pitch, length, the model used brands, the number of,, the use of materials commonly used to understand the parameters. According to the different types of each, the use of each will be different according to the material to choose different materials, the rate of melting speed, melting heat absorption properties, melt viscosity, water absorption, thermal stability properties There are differences between the plastic injection molding machine screw shape requirements are very different. Even if the same kind of plastic, due to different products, plastic added flame retardants, lubricants, glass fiber, inorganic minerals and other modifiers and fillers, or color mixing requirements, the requirements of melting homogenization, not melting The different shape of the particle material, have different requirements on the screw to choose.

As the selection of the screw-press type series, we have to choose the right kind of injection molding machine or which series to make the product, for example, the general thermoplasticity Plastic or bakelite raw materials or PET raw materials, etc., is monochrome, twin-screw, multicolor, mezzanine or mixed color. In addition, certain products require conditions such as high stability (closed loop), high precision, very high rate of fire, high shot pressure or fast production (multiple circuits), etc., and the appropriate series must be selected to manufacture the corresponding ones.