ABS resin is acrylonitrile-butadiene-styrene copolymer. ABS plastic raw material is light yellow granular or beaded opaque resin, which is a bulk general-purpose resin. ABS is an engineering plastic after being modified (adding additives or alloys) to improve its performance. ABS alloy has a large output, a variety of types and a wide range of applications, and is main modified plastic.
Tag: screw speed
(1) Gradually heat up from the first stage (feeding place) to third stage (before nozzle), temperature setting value of each stage differs by about 5~10 ℃, and gradually heat plastic to appropriate processing temperature. Various plastics have its different processing temperatures. (2) For low-viscosity plastics, in order to avoid material leakage when machine base retreats, nozzle temperature can usually be set to third stage temperature or slightly lower (about 5℃), but too low will cause cold material, prone to flow marks during injection. For high-viscosity plastics, setting value can be about 5~10℃ higher than temperature of third stage, which can be used to heat runner system during injection. (3) Melt is heated by friction due to rotation of screw, which often causes temperature of melt in third stage to be higher than set value of heater, generally even 15~30℃ higher, so it should be avoided that temperature setting is too high to cause thermal degradation
Electroplated PC/ABS parts are widely used in automobiles, home appliances and IT industries due to their beautiful metallic appearance. Material formulation design and electroplating process are usually considered to be main factors affecting electroplating performance of PC/ABS. However, few people pay attention to impact of injection molding process on electroplating performance.
Temperature in brackets is recommended as basic setting value, stroke utilization rate is 35% and 65%, ratio of module flow length to wall thickness is 50:1 to 100:1
Gud Mould 