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The causes and solutions of black spots in injection molding
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The causes and solutions of black spots in injection molding

Views: 3     Author: Site Editor     Publish Time: 2023-06-21      Origin: Site

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The causes and solutions of black spots in injection molding

Injection molding is a common production process that can be used to produce plastic products of various shapes. However, during the injection molding process, some problems may occur, one of which is the appearance of black spots. This paper will analyze the causes of black spots in injection molding in detail, and put forward the corresponding solutions.


During injection molding, black spots are usually caused by impurities in the plastic or the involvement of air in the molten state. In addition, too high temperature, too fast injection speed, mold closing speed and other process factors may also lead to the generation of black spots. These black spots will not only affect the appearance of the product quality, but also reduce the mechanical properties and durability of plastic products.

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In order to solve the problem of black spots in injection molding, we can take the following measures:

1. Improve the purity of raw materials: ensure that the plastic raw materials used are clean and free of impurities, and regularly clean and replace raw materials to reduce the introduction of impurities.

2. Optimize the injection molding process: reasonably adjust the temperature, injection speed and mold closing speed and other process parameters to reduce the involvement of air and residual impurities.

3. Increase the exhaust tank: Increasing the exhaust tank in the mold is conducive to discharging the gas and impurities from the mold, thereby reducing the generation of black spots.

4. Use dry raw materials: Ensure that the plastic raw materials used are dry to avoid the conversion of water into gas at high temperatures, resulting in the generation of black spots.

5. Regular maintenance of the mold: timely clean the residue and oxide layer in the mold to maintain the finish of the mold and reduce the generation of black spots.

640 (2)

Solving the problem of black spots in injection molding is very important to improve the appearance quality and mechanical properties of products. By optimizing the injection molding process, improving the purity of raw materials, increasing the exhaust tank, using dry raw materials and regularly maintaining the mold, the generation of black spots can be effectively reduced, thereby improving production efficiency and product quality. If you encounter other problems during the injection molding process, please feel free to contact us and we will be happy to provide you with a solution. The causes and solutions of black spots in injection molding

Injection molding is a common production process that can be used to produce plastic products of various shapes. However, during the injection molding process, some problems may occur, one of which is the appearance of black spots. This paper will analyze the causes of black spots in injection molding in detail, and put forward the corresponding solutions.


During injection molding, black spots are usually caused by impurities in the plastic or the involvement of air in the molten state. In addition, too high temperature, too fast injection speed, mold closing speed and other process factors may also lead to the generation of black spots. These black spots will not only affect the appearance of the product quality, but also reduce the mechanical properties and durability of plastic products.

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In order to solve the problem of black spots in injection molding, we can take the following measures:

1. Improve the purity of raw materials: ensure that the plastic raw materials used are clean and free of impurities, and regularly clean and replace raw materials to reduce the introduction of impurities.

2. Optimize the injection molding process: reasonably adjust the temperature, injection speed and mold closing speed and other process parameters to reduce the involvement of air and residual impurities.

3. Increase the exhaust tank: Increasing the exhaust tank in the mold is conducive to discharging the gas and impurities from the mold, thereby reducing the generation of black spots.

4. Use dry raw materials: Ensure that the plastic raw materials used are dry to avoid the conversion of water into gas at high temperatures, resulting in the generation of black spots.

5. Regular maintenance of the mold: timely clean the residue and oxide layer in the mold to maintain the finish of the mold and reduce the generation of black spots.


Solving the problem of black spots in injection molding is very important to improve the appearance quality and mechanical properties of products. By optimizing the injection molding process, improving the purity of raw materials, increasing the exhaust tank, using dry raw materials and regularly maintaining the mold, the generation of black spots can be effectively reduced, thereby improving production efficiency and product quality. If you encounter other problems during the injection molding process, please feel free to contact us and we will be happy to provide you with a solution.

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