When the injection molding process, the product appears white phenomenon how to do?

Injection molding is a kind of molding process widely used in the manufacturing industry, it is by injecting the molten plastic into the mold, after cooling and curing to remove the required plastic products. However, in the actual production process, the phenomenon of top white products is a common problem.

So, what is whiteness? How to deal with it?

The top white phenomenon refers to the appearance of a layer of white material on the top or edge of the injection molded product, which will affect the appearance quality of the product and reduce the added value of the product.

The causes of the top white phenomenon are mainly as follows:

1. Raw materials are not pure: In the injection molding process, if the raw materials contain impurities or water, it will lead to the top white phenomenon of the product.

2. Improper temperature control: During the injection molding process, the control of temperature has a great impact on the quality of the product. If the temperature is too high or too low, it may lead to the occurrence of top white phenomenon.

3. Mold design is unreasonable: if the mold exhaust is poor, it will lead to gas accumulation in the product, resulting in top white phenomenon.

4. Insufficient injection pressure: If the injection pressure is insufficient, the raw material can not be completely filled in the mold, resulting in the phenomenon of top white. Therefore, the injection pressure should be reasonably controlled according to the characteristics of raw materials and the requirements of products.

After understanding the causes of the top white phenomenon, it can be targeted to deal with. Here are some suggestions:

1. Optimize raw materials: Select raw materials with high purity and less impurities, which can effectively reduce the probability of occurrence of top white phenomenon. At the same time, pay attention to the storage conditions of raw materials to avoid moisture or contamination of raw materials.

2. Strict control of temperature: according to the characteristics of raw materials and product requirements, reasonable setting of injection temperature, mold temperature and cooling temperature. In the production process, real-time monitoring of temperature changes to ensure temperature stability.

3. Improve the mold design: In the mold design, the exhaust problem should be fully considered. Multistage exhaust can be used to improve the exhaust effect of the mold. At the same time, the mold should be cleaned and maintained regularly to ensure the good condition of the mold.

4. Adjust the injection pressure: set the injection pressure reasonably according to the characteristics of raw materials and the requirements of products. In the production process, the change of injection pressure should be monitored in real time to ensure the stability of injection pressure.

5. Optimize the injection speed: If the injection speed is too fast, it will cause turbulence in the raw material in the mold, resulting in top white phenomenon. Therefore, the injection speed should be reasonably controlled according to the characteristics of raw materials and the requirements of products.