The general purpose screw is generally divided into thr […]
The general purpose screw is generally divided into three sections: the feed section, the compression section, and the homogenization section, which are matched by a complete set of barrels. First of all, we must confirm the parameters: the commonly used parameters such as the aspect ratio, the compression ratio, the diameter, the pitch, the length, the model brand used, the number of balls, and the materials used.
According to the difference of each model, each used will be different according to the material to choose different materials, its melting speed value, the function of heat absorption during melting, melt viscosity, water absorption, thermal stability function and other characteristics There are various differences, and there are great differences in the shape requirements of the plasticizing screw of the injection molding machine.
Even if the same kind of plastic has different products, the added flame retardants, lubricants, glass fibers, inorganic minerals and other modifiers and fillers added to the plastic are different, and the requirements for color mixing and melting and homogenization are different. The shape of the granular material is different, and all have different requirements for the screw to choose.
The screw is selected according to the model series, because the injection molding machine has a very large variety of series, so we have to choose at the beginning, first correctly determine which injection molding machine or series the product should be produced, such as general thermoplastic Plastic or electric wood material or PET material, etc., are single color, twin screw, multi-color, sandwich or mixed color, etc.
In addition, some products require conditions such as high stability (closed loop), high precision, ultra-high rate of fire, high injection pressure, or rapid production (multi-loop), and it is also necessary to select a really suitable series to make the corresponding special.