Brittle fracture is a common and challenging issue in the production of plastic products. So, what factors typically contribute to this phenomenon? Engineers from Yize Mould, with 15 years of rich experience in mould manufacturing, have summarized the following potential causes of brittle fracture:

1. Insufficient injection and holding pressure from the injection molding machine;

2. Low back pressure, resulting in loosely packed raw material;

3. Excessive back pressure, leading to increased shear and friction heat;

4. Slow injection speed, preventing full crystallization of the material;

5. Excessively high mold temperature, causing raw material overheating, decomposition, or degradation;

6. Low mold temperature, preventing full crystallization;

7. Insufficient injection and holding time;

8. Prolonged downtime of the injection molding machine or extended injection cycle;

9. Extended storage time of the material;

10. High proportion of secondary recycled material in the new material;

11. Insufficient strength, toughness, or viscosity of the raw material;

12. Improper use or excessive addition of additives;

13. Insufficient drying of the raw material;

14. Uneven internal structure of the product, with some areas too thick and others too thin, and inappropriate feed design;

15. Uneven mold feeding and insufficient cold slug wells;

16. Excessively thin product walls;

17. Unstable and fluctuating temperature of the injection molding machine;

18. Poor cleaning of the material tube in the injection molding machine;

19. Improper ejection design, leading to increased stress in the plastic and subsequent cracking;

20. Poor design of the cooling circuit in the plastic mold.

The above factors can all potentially lead to brittle fracture in plastic products. However, in actual production, the situation may be more complex and variable, requiring specific analysis of each issue based on the extensive experience of the personnel involved.