Plastic products often have brittle fracture defects in production. What are the causes? Our engineers have summarized the following causes of brittle fracture?
1. Insufficient injection and pressure holding of injection molding machine;
2. The back pressure is too small and the raw materials are not solid enough;
3. Excessive back pressure increases shear and friction heat;
4. Slow firing rate and insufficient crystallization;
5. The mold temperature is too high, and the raw materials are overheated, decomposed and deteriorated;
6. The mold temperature is too low and the crystallization is insufficient;
7. Insufficient injection and pressure holding time;
8. The shutdown time of injection molding machine is too long, and the injection molding cycle is too long;
9. The storage time is too long;
10. The proportion of secondary recycling in new materials is too large;
11. Insufficient strength, toughness and viscosity of raw materials;
12. Unreasonable additives or excessive additives;
13. Insufficient drying of raw materials;
14. The internal structure of the product is too thick in some places, too thin and uneven in some places, and the feeding place is unreasonable.
15. Uneven mold feeding and insufficient cold wells;
16. The wall thickness of the product is too thin
17. The temperature of injection molding machine is high and low, which is unstable;
18. The material pipe of the injection molding machine is not cleaned;
19. The ejection is unreasonable, and the stress of plastic body increases, resulting in fracture;
20. The cooling circuit of plastic mold is not well arranged.
These are the reasons for brittle fracture of plastic products, but there will be many situations in the actual production process, and specific problems need to be analyzed according to the experience of employees for many years.
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