In production, it is often encountered that a heating c […]
In production, it is often encountered that a heating coil is damaged or the heating control portion is out of control, and the temperature of the dustbin mould is drastically changed to cause chromatic aberration. The chromatic aberration caused by these causes is easy to determine. Typically, the heating ring is damaged and the chromatic aberration is accompanied by uneven plasticization, and the heating control portion is out of control and often burns due to product spots, severe discolouration or even coking. Therefore, the heating components should be inspected frequently during the production process, and the heating components are found to be damaged or out of control and replaced in time to reduce the occurrence of such chromatic aberration.
When the injection moulding process parameters need to be adjusted for non-chromatic aberration reasons, the injection moulding temperature, back pressure, injection cycle and masterbatch addition amount should not be changed as much as possible. Adjustments also need to observe the effect of changes in process parameters on colour. If the colour difference is found, it should be adjusted in time.
Avoid high injection speeds, high back pressures and other injection moulding processes that produce strong shear to prevent chromatic aberrations caused by local overheating or thermal decomposition. Strictly control the temperature of each heated portion of the dustbin mould, especially the nozzle and the heated portion near the nozzle.
It is also necessary to know the trend of the colour of the product as a function of temperature and masterbatch before performing the colour difference adjustment. The masterbatch of different colours varies with the temperature or colour masterbatch of the product, and the colour change law of the product is also different. The colour change process can be used to determine the law of change. Unless the colour change of the colour masterbatch is known, it is not possible to quickly adjust the chromatic aberration, especially when using the colour tone produced by the new masterbatch.