How to control the black spots from transparent parts or white parts during injection molding?

The first question must be established: how do black spots come about? In the process of plastic forming, the system is nothing more than that several: plastic raw materials, forming machine, forming standard, mold shell, natural environment, operators; Thus, the source of the black spots is also these.

We should strictly control the black spots on the surface of plastic parts, improve the quality of plastic products, reduce the consumption of plastic raw materials and manpower, and control the cost.

1. Before adding material to hopper, ensure that hopper is completely and thoroughly cleaned without magazines.

2. When feeding, if you see any raw materials contaminated by the environment or with black spots, be sure to pick them out.

3. All mixed materials must be immediately packed in tightly sealed bags and marked.

4. All feeding bags and special feeding tools should be completely clean and tidy to prevent environmental contamination of raw materials.

5. As far as possible to ensure the injection workshop clean clean room.

6. The drying barrel must be clean and tidy, and the air inlet must be covered with cloth to prevent dust from entering the drying barrel.

7. Before feeding, the dust outside and bottom of the bag should be cleaned neatly before feeding. If there are remaining raw materials in the bag, the plastic bag should be sealed tightly.

8. The material in the hopper can not be added too full, must always cover the outer cover of the hopper, to avoid dust in the air into the hopper.

9. After adjusting the machine, do not use stained hands to take goods and water parts, be sure to wear clean gloves to take.

10. All environmentally contaminated or black spotted substandard goods contain plastic raw materials and should not be reused.