在注塑過程中，如果生產有色產品，有時注塑件不著色或顏色不均勻。這是什麽原因？要怎（zěn）麽進（jìn）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?
著色劑質量不符合使用要求
The quality of colorant does not meet the use requirements
如果著色劑或添加劑的熱穩定性較差，則容易在機筒內受熱分解，導致塑件變色（sè）。此（cǐ）外，著色（sè）劑易漂（piāo）浮（fú）在空氣中，沉積在料鬥（dòu）等部位，汙染（rǎn）注塑機和模具，造成塑件表麵顏色不均。
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，在選擇著色劑時，應根據工藝條件和塑件的顏色要（yào）求仔細篩選，尤其是耐熱溫度、分散特性等更為重要的（de）指標，必須滿足工（gōng）藝要求，以及宜采（cǎi）用濕混法。
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.
成型條件不（bú）當
Improper forming conditions
顏色不均（jun1）往往體現在不同的現（xiàn）象上，其成因也不盡相同。如果進料口附近或焊接部位顏色不均勻，一（yī）般是著色劑分布不均或著色（sè）劑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.
為防止熔料（liào）在高溫料筒內停留時間過（guò）長，造成過熱分解，注射量（liàng）不應超過注塑機注射量的三分之二。當機筒或噴嘴處有焦化熔體堆積時，應徹底清洗機筒，將噴嘴拆下清洗，檢查噴嘴頭與澆道套是否對齊，適當降低噴嘴溫度。
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.\
模具問題
Mold problem
濟南注塑加工（gōng）提醒，如果模（mó）具中的油、脫模劑或頂針（zhēn）與銷孔摩擦產生的汙垢混入（rù）熔體中（zhōng），模具排（pái）氣（qì）不良，模具冷卻不均勻，會導致塑件表麵變色。因此，注射前應保持（chí）型腔清潔。為減（jiǎn）少排氣不（bú）良的影響，可適當減小（xiǎo）鎖模力，或重新定位澆口，在充填處設置排氣（qì）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.
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