在注塑过程中，如果生产有色产品，有时注塑件不着色或颜色不均匀。这是什么原因？要怎么进行呢？
In the injection molding process, if colored products are produced, sometimes the injection molded parts are not colored or the color is uneven. What's the reason? How to solve it?
着色剂质量不符合使用要求
The quality of colorant does not meet the use requirements
如果着色剂或添加剂的热稳定性较差，则容易在机筒内受热分解，导致塑件变色。此外，着色剂易漂浮在空气中，沉积在料斗等部位，污染注塑机和模具，造成塑件表面颜色不均。
If the thermal stability of colorant or additive is poor, it is easy to decompose in the barrel, resulting in discoloration of plastic parts. In addition, the colorant is easy to float in the air and deposit in the hopper and other parts, polluting the injection molding machine and mold, resulting in uneven surface color of plastic parts.
因此，在选择着色剂时，应根据工艺条件和塑件的颜色要求仔细筛选，尤其是耐热温度、分散特性等更为重要的指标，必须满足工艺要求，以及宜采用湿混法。
Therefore, when selecting colorants, they should be carefully selected according to the process conditions and the color requirements of plastic parts, especially the more important indexes such as heat-resistant temperature and dispersion characteristics, which must meet the process requirements, and the wet mixing method should be adopted.
成型条件不当
Improper forming conditions
颜色不均往往体现在不同的现象上，其成因也不尽相同。如果进料口附近或焊接部位颜色不均匀，一般是着色剂分布不均或着色剂性能不符合使用要求造成的。
Color unevenness is often reflected in different phenomena, and its causes are also different. If the color near the feed inlet or the welding part is uneven, it is generally caused by uneven distribution of colorant or the performance of colorant does not meet the use requirements.
为防止熔料在高温料筒内停留时间过长，造成过热分解，注射量不应超过注塑机注射量的三分之二。当机筒或喷嘴处有焦化熔体堆积时，应彻底清洗机筒，将喷嘴拆下清洗，检查喷嘴头与浇道套是否对齐，适当降低喷嘴温度。
In order to prevent the molten material from staying in the high-temperature barrel for too long, resulting in overheating and decomposition, the injection volume shall not exceed two-thirds of the injection volume of the injection molding machine. When there is coking melt accumulation at the barrel or nozzle, thoroughly clean the barrel, remove the nozzle for cleaning, check whether the nozzle head is aligned with the sprue sleeve, and appropriately reduce the nozzle temperature.\
模具问题
Mold problem
济南注塑加工提醒，如果模具中的油、脱模剂或顶针与销孔摩擦产生的污垢混入熔体中，模具排气不良，模具冷却不均匀，会导致塑件表面变色。因此，注射前应保持型腔清洁。为减少排气不良的影响，可适当减小锁模力，或重新定位浇口，在充填处设置排气孔。
Jinan injection molding reminds that if the oil, release agent or dirt generated by the friction between the ejector pin and the pin hole in the mold is mixed into the melt, the mold exhaust is poor and the cooling of the mold is uneven, which will lead to the discoloration of the surface of the plastic part. Therefore, the cavity should be kept clean before injection. In order to reduce the influence of bad exhaust, the mold locking force can be appropriately reduced, or the gate can be relocated and the exhaust hole can be set at the filling place.
After explaining the solution of color instability in injection molding, if you have any ideas, you can come to the website at www.sdlqmj.com at any time Com share.
