Color difference is a common quality issue in the injection molding process, and the influencing factors of color difference are complex, covering multiple aspects such as raw material resin, color masterbatch (or color powder), mixing effect of color masterbatch and raw materials, injection molding process, injection molding machine performance, and mold condition. In actual production, based on the characteristics of the joint research mold, we generally comprehensively control color difference from the following aspects:
1. Optimize the design and maintenance of joint research molds:
Choose and design a reasonable joint research mold to ensure the design of key parts such as the pouring system and exhaust groove is reasonable, and to reduce color differences caused by mold problems. Regularly maintain the mold, inspect and repair defects that may affect color uniformity, such as wear and tear, dirt accumulation, etc., to ensure the best condition of the mold and reduce the possibility of color difference.
2. Eliminating the influence of injection molding machines and mold factors:
Choose an injection molding machine that matches the capacity of the injection molded product to ensure stable performance and no material dead corners. If any problems are found, the equipment should be replaced or adjusted in a timely manner. At the same time, potential problems such as mold pouring system and exhaust groove are solved through professional maintenance services provided by the joint research mold, providing solid hardware support for production.
3. Strictly control the quality of raw resin and colorants:
The quality of raw resin and color masterbatch is the key to controlling color difference. For raw resin, attention should be paid to its thermal stability, especially when producing light colored products. For colorants, it is not only necessary to choose suppliers with reliable quality, but also to conduct color sampling and testing before mass production to ensure that the color of the colorants is consistent. In addition, the use of collaborative molds can help better mix raw materials and colorants, improve mixing uniformity, and reduce color differences.
4. Improve the mixing process of color masterbatch and masterbatch:
To address the issue of uneven mixing of colorants and masterbatch, in addition to mechanical mixing, manual mixing or the use of auxiliary equipment such as hot air dryers are also necessary to ensure uniform mixing. Especially for the production of colored products by adding color powder, it is necessary to avoid using suction machines that are prone to separation and adopt manual feeding methods to reduce the risk of color difference.
5. Fine control of injection molding process parameters:
When adjusting injection molding process parameters, it is advisable to avoid changing key parameters that affect color, such as injection temperature, back pressure, injection cycle, and amount of color masterbatch added. At the same time, special attention should be paid to controlling the temperature of the material barrel to prevent color deviation caused by temperature fluctuations. In addition, by utilizing the precision design and precise temperature control system of the joint research mold, the impact of process adjustments on color difference can be further reduced.
6. Master the color change pattern:
Before adjusting the color difference, it is necessary to understand and master the rules of product color changing with temperature and color masterbatch. This usually needs to be determined through a color testing process. For new colorants or new processes, they should be treated with caution and their color change patterns should be mastered through multiple experiments in order to quickly and accurately adjust color differences.
In summary, by optimizing the design and maintenance of the joint research mold, strictly controlling the quality of raw materials, improving the mixing process, finely controlling the injection molding process parameters, and mastering the color change law, the color difference problem in the injection molding process can be effectively controlled, and the product quality and production efficiency can be improved.
Foshan Heyan Precision Mould Technology Co., Ltd.'s main business is preform moulds, bottle blowing moulds, bottle cap moulds and other products. It has a strong engineering, R&D, technology and sales team, advanced processing equipment and rich project experience. If you want to know more or have special needs, please call 13318345050, or add our WhatsApp.
