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How to match the screw to the injection molding machine

Update:30 Aug 2019
Summary:

In the general injection molding machine, it is general […]

In the general injection molding machine, it is generally divided into three sections: a feed section, a compression section, and a homogenization section, and a complete set of barrels is matched. First, we need to determine the parameters: length to diameter ratio, compression ratio, diameter, pitch, length, model of the model used, number of turns, materials used, etc. Depending on the type of machine, each material used will be different depending on the material. The melting rate, the heat absorbed during melting, the melt viscosity, the water absorption, and the thermal stability. There are various differences, and there is a big difference in the shape requirements of the plasticizing screw of the injection molding machine. Even if the same kind of plastic, because of different products, the modifiers and fillers of flame retardants, lubricants, glass fibers, inorganic minerals, etc. added by plastics are different, or the requirements for color mixing and melting homogenization are different. The shape of the granular material is different, and the screw has different requirements to choose.

The screw is selected according to the model series. Since there are many types of injection molding machines, we have to choose from the beginning to correctly judge which kind of injection molding machine, or which series, should be produced. For example, general thermoplastics. Plastic or bakelite materials or PET raw materials, etc., are monochromatic, twin-screw, multi-color, interlayer or mixed color. In addition, some products require high stability (closed loop), high precision, ultra high rate of fire, high injection pressure or rapid production (multi-loop) conditions, and must also choose the appropriate series to manufacture the corresponding special.