Extrusion:
    The heat resistance of the toner is poor, so the temperature must be kept low when manufacture black masterbatch. Do not allow the material to stay in the extruder for a long time. When the extruder die is clogged, the material in the barrel can also cause discoloration. Materials with poor heat resistance cannot be granulated twice. For the easily decomposable PVC resin, the machine can not be shut down during production to avoid discoloration due to the coke. If the toner is resistant to shearing, the temperature can be appropriately lowered and the screw rotation speed can be increased to increase the viscosity of the melt, and the transfer shearing effect is large, the toner dispersion is promoted, and the coloring power is enhanced. If the pearlescent masterbatch has a slightly poorer effect, the temperature can be increased, the melt viscosity can be lowered, and the shear viscosity’s effect on reducing the pearlite particle size can be reduced. If the pearl effect is too good, the operation can be reversed; if the pearl effect is very poor, reduce the screw speed, increase the temperature, or replace the screw with small shearing effect. The replacement of the extrusion machine causes chromatic aberration, mainly due to the difference in screw shearing effect resulting in dispersion inconsistency.
 
 surroundings:
 
    The environmental requirements for blown film-specific black masterbatch production are particularly high. Since most of the coloring agent is powder, the floating dust in the air is easily polluted by the environment. Isolation and timely cleaning between production lines are necessary and cannot be ignored. Residues in the equipment will have an impact on the next batch of products. Mixers, extruders, feeding devices, storage tanks, pelletizers, etc. must be thoroughly cleaned. The same kind of carrier resin can be produced from shallow to deep color, and when from dark to light, the screw must be cleaned. When the color masterbatches are produced by the same machine one after one, the color is affected by incompatibility due to the change of the carrier resin. Different processing temperatures, melting temperature and decomposition temperature will cause discoloration of the coke. Screw cleaning must be performed if necessary.
 
 Human error:
 
    Human error may include: weighing, feeding varieties are wrong，processing technology research. From understanding customer needs, selecting raw materials, color matching, producing color masterbatch sample, to mass production, each process is strictly checked and confirmed, which can reduce waste, stabilize and improve product quality. With the application of new materials and new technologies, the control technology of chromatic aberration will continue to improve and develop.