在注塑過(guò)程中，如果生產(chǎn)有色產(chǎn)品，有時(shí)注塑件不著色或顏色不均勻。這是什么原因？要怎么進(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(zhì)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(wěn)定性較差，則容易在機(jī)筒內(nèi)受熱分解，導(dǎo)致塑件變色。此外，著色劑易漂浮在空氣中，沉積在料斗等部位，污染注塑機(jī)和模具，造成塑件表面顏色不均。
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(shí)，應(yīng)根據(jù)工藝條件和塑件的顏色要求仔細(xì)篩選，尤其是耐熱溫度、分散特性等更為重要的指標(biāo)，必須滿(mǎn)足工藝要求，以及宜采用濕混法。
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.
成型條件不當(dāng)
Improper forming conditions
顏色不均往往體現(xiàn)在不同的現(xiàn)象上，其成因也不盡相同。如果進(jìn)料口附近或焊接部位顏色不均勻，一般是著色劑分布不均或著色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.
為防止熔料在高溫料筒內(nèi)停留時(shí)間過(guò)長(zhǎng)，造成過(guò)熱分解，注射量不應(yīng)超過(guò)注塑機(jī)注射量的三分之二。當(dāng)機(jī)筒或噴嘴處有焦化熔體堆積時(shí)，應(yīng)徹底清洗機(jī)筒，將噴嘴拆下清洗，檢查噴嘴頭與澆道套是否對(duì)齊，適當(dāng)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(wèn)題
Mold problem
濟(jì)南注塑加工提醒，如果模具中的油、脫模劑或頂針與銷(xiāo)孔摩擦產(chǎn)生的污垢混入熔體中，模具排氣不良，模具冷卻不均勻，會(huì)導(dǎo)致塑件表面變色。因此，注射前應(yīng)保持型腔清潔。為減少排氣不良的影響，可適當(dāng)減小鎖模力，或重新定位澆口，在充填處設(shè)置排氣孔。
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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