In production, it is often encountered that a certain h […]
In production, it is often encountered that a certain heating coil is damaged or the heating control part is out of control, and the temperature of the barrel is drastically changed to cause chromatic aberration. The color difference caused by such reasons is easy to determine. Generally, the heating ring damages and the chromatic aberration is accompanied by uneven plasticization, and the heating control part is out of control and often burns with product spot, severe discoloration or even coking. Therefore, the heating part should be inspected frequently during production, and it is found that the heating part is damaged or out of control and replaced in time to reduce the occurrence of such chromatic aberration.
When the non-color difference reason needs to adjust the injection moulding process parameters, the injection temperature, back pressure, injection cycle and color masterbatch addition amount should not be changed as much as possible. The adjustment also needs to observe the influence of the process parameter change on the color. If the color difference is found, it should be adjusted in time.
Avoid using high injection speed, high back pressure and other injection moulding processes that cause strong shearing to prevent chromatic aberration caused by local overheating or thermal decomposition. Strictly control the temperature of each heating section of the barrel, especially the nozzle and the heating part close to the nozzle.
It is also necessary to know the trend of the color of the product as a function of temperature and color masterbatch before performing the color difference adjustment. Different color masterbatch varies with the temperature or color masterbatch of the product, and the color change law of the product is different. The color change process can be used to determine the law of change. Unless the color change of the color masterbatch is known, it is impossible to quickly adjust the color difference, especially when using the color tone produced by the new color masterbatch.