What is the black spot in the injection molding machine? Black spots on the injection molding machine will reduce the overall quality of the product, so it is important to find the black spots of the injection molding product.

Possible causes of black spots on the product and solutions:

1. The overheated part of the plastic is attached to the inner wall of the melt cylinder

Thorough air-vacuation, remove the melt cylinder to clean, reduce the plastic temperature, reduce the heating time, and strengthen the plastic drying process

2. The raw materials are not clean, there are some impurities inside, plastic mixed with debris, paper scraps, etc.

Check the plastic, completely airshot

3. Produce a focal spot when entering the mold

Reduce the pressure and speed of the injection, reduce the temperature of the plastic, strengthen the venting holes of the mold, reduce the mold pressure, and change the position of the overflow.

4. There is a dead angle in the molten rubber cylinder to overheat the plastic. For example, the back pressure of the molten rubber is too large, and the overheated portion of the plastic adheres to the inner wall of the molten rubber tube.

Check the contact surface between the nozzles of the nozzle to see if there is any gap or corrosion.

In the case of knowing the black spots of the product, find the corresponding control method:

1. Check if there is a dust-free polishing bucket and cleaning auxiliary machine in the hopper

2. Check for dirt or corrosion; clean and polish or replace

3. Check the impurities in the raw materials; substitute raw materials

4. Check the screws: clean and polish the screws

5. Check flanges, nozzles; clean and polish or replace

6, check the temperature settings of each part; calm down, reduce back pressure

7. Blow thoroughly, remove the melter for cleaning, reduce plastic temperature, shorten heating time, and enhance the plastic drying process.

In addition, the quality of the raw materials is also crucial. If the pellets used have quality problems, problems such as easy scorching will occur. In this respect, we can guarantee that the pellets we produce do not have any quality problems in developing countries. At the leading level.

Company's core partners, Wuxi Jiahong Plastics Technology Co., Ltd. Who has more than 28 years history of PVC mixture formulation development and granulation products, we have been providing high quality products and services to Southeast Asia, North America, Europe and other countries for many years. Meanwhile, Hongxu Company is an agent of overseas sales and international cooperation business for Wuxi Kangxi Plastic Technology Co., Ltd’s modified engineering plastics.

original text：pvc compound