Briefly describe the selection and differentiation of various models


Double-alloy screw: For recycled materials with more im […]

Double-alloy screw: For recycled materials with more impurities, plastics with more glass fiber reinforced plastics and inorganic mineral fillers (calcium powder, carbon powder, talcum powder, etc.), the screw has good wear resistance.
Acid screw assembly: Aiming at the strong corrosive properties of CP, CA and other acidic plastics, the screw, melter barrel and other plasticized parts are specially designed in structure and surface treatment. The screw assembly has good corrosion resistance.
PC special screw: For PC and other high-viscosity plastics, it has low shear heat generation, acid corrosion resistance, medium and small diameters, good effects in forming PC, PP-R, and flame retardant ABS. It can also form general plastics and PMMA ordinary products. The color mixing effect is poor. If plastic powder is added, a reinforced color mixing screw needs to be customized.
PA special screw: Aiming at the characteristics of low PA viscosity, difficult coloring, fast melting speed and good self-lubrication, the screw has good color mixing effect, stable feed volume and good exhaust effect. Middle diameter. Molding of PA, PP, LCP and other crystalline low-viscosity bottom plastics is effective. Can also be molded into general plastic. Not suitable for high viscosity and poor thermal stability plastics such as PC and PMMA flame retardant ABS. Low shear heat and good color mixing. Middle diameter molding PMMA, PP-R, PC, ABS, etc. has a good effect when adding color powder, such as plastic with flame retardant, screws need to be chrome-plated.
PET special screw: for the characteristics of low PET viscosity, large specific heat capacity, easy-to-stick materials and PET preforms, the characteristics of fast plasticization and uniform plasticization are required. High yield when blowing preforms. Large diameter can also be molded into general plastic.
PBT special screw: Aiming at the characteristics of easy decomposition of PBT, pressure sensitivity and the need to add glass fiber, the screw generates stable pressure, and uses dual alloys to improve wear resistance.
UPVC special screw: For UPVC high viscosity, easy to decompose, strong corrosiveness and good plasticizing requirements of PVC pipe joints. The screw has good plasticization, less shear heat, and acid corrosion resistance. Because there is no apron, it cannot be used for low-viscosity plastics and products with more accurate injection speed and pressure classification. In addition, due to the need to dissipate heat and cool down, when making UPVC products, the barrel (melt tube) must be used in conjunction with the screw with forced air cooling.