Chromatic aberration is a common defect injection in the case because the color difference caused by fittings injection molding machine is not small batches see scrapped. Color influenced by many factors related raw material resin, masterbatch, masterbatch mixed with the raw materials, injection molding process, injection molding machine, mold, etc., because of widespread involve surface, the color control technology is also recognized as difficult to master one of injection molding technology. In the actual production process, we are generally carried out in the following six areas of color control.

1 to eliminate the influence of factors of injection molding machines and molds
To select the primary product and injection capacity considerable injection molding machines, injection molding machines exist if dead material and other issues, it is best to replace the equipment. For die casting system, exhaust ducts caused by chromatic aberration, can be solved by a corresponding portion of the mold repair mold. We must first solve the problem of injection molding machines and die before they can organize production, to reduce the complexity of the problem.

2 eliminate the impact of the raw material resin, masterbatch
Control of raw materials is the key to solve the color difference. Thus, in particular, the production of light products, can not ignore the thermal stability of the raw material resin for products different color fluctuations significantly affected. Given that most of injection molding manufacturer does not manufacture or plastic masterbatch masterbatch, which can be the focus of attention on production management and materials testing. Namely strengthening the raw material storage test; the production of the same products as far as possible the same manufacturer, same grade masterbatch, masterbatch production; for masterbatch production before we try to conduct sampling of color, it is necessary to proofread last time, but also In this comparison, if the color or less, may be considered eligible, as there is a slight color masterbatch batches can be remixed masterbatch before use, to reduce the chromatic aberration caused by uneven mixing masterbatch itself. At the same time, we need to focus on testing the thermal stability of the raw material resin, masterbatch, for the thermal stability of the poor, we recommend the manufacturer for replacement.

3 Elimination of masterbatch masterbatch mixed with the uneven impact
Plastic masterbatch masterbatch mixed with bad products also make color changeable. After the parent materials and masterbatch mechanical mixing, when fed through the lower suction hopper, because electrostatic interaction, masterbatch masterbatch with separate, easily adsorbed on the hopper wall, which is bound to cause a change in the amount of masterbatch injection cycle, resulting in color. In such cases the raw material can be taken before the suction hopper to artificial mixing solutions. There are a lot of companies use feeders to join masterbatch, which saves a lot of manpower, and color control to provide a lot of help, but many companies due to improper use, the results are often unsatisfactory. Under fixed speed feeder masterbatch added depends on the number plasticizing time, and plasticizing time itself is fluctuating, sometimes even relatively large fluctuations, so to ensure a constant feed amount, need to be fixed feeder feeding time and the set time is less than the minimum plasticizing time. When using the feeder should be noted that, due to the smaller feeder outlet, after a period of time, it may be because the screw feeder accumulation of raw materials are not allowed under silt caused even cause feeder stall, so need to be cleaned regularly.

4 to reduce the impact of temperature on the color of the barrel
Production often encounter would damage due to a heating coil or a heating control portion cause burn out of control long cylinder temperature to produce dramatic changes in color. Such color causes quite easy to determine, but in general it would damage the heating coil to produce chromatic aberration will be accompanied by plasticizing inequality, while heating control section burn out of control long as the product is often accompanied by air spots, severe discoloration or coking phenomenon. Therefore, the production need regular checking heating section, find the heating portion timely replacement repair when damaged or out of control, in order to reduce the chance of such a color difference.

Injection molding process to reduce the impact of adjustments 5
When the reason for the non-color injection molding process parameters to be adjusted, as far as possible without changing the injection temperature, back pressure, injection cycle and the amount of masterbatch is added to adjust at the same time the need to observe the effect of changes in process parameters for color, the color should be timely adjusted found. Try to avoid the use of high injection speed, high back pressure caused by strong shear injection molding process, prevent color due to local overheating or thermal decomposition caused by such factors. Strict control barrel temperature of the heating section, especially close to the heated portion of the nozzle and nozzle.

6 master cylinder temperature, the amount of product masterbatch color change
Before color adjustment you must also know the product color temperature, amount of masterbatch trends. Change the temperature or the amount of masterbatch with different masterbatch production, and its products are different color variation. Which can be determined by test color variation process. Unless already know this masterbatch color variation, it is impossible to quickly adjusted the color, especially in the introduction of new color masterbatch production time.

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