The cause of molding failure in plastic injection molding is complex and multiple factors involved in the molding process. Therefore, in terms of measures and solutions, it is necessary not only to consider molding failures based on a single cause, but also to carefully observe defective moldings with considering various solutions.
Among the causes of molding failures, the following six points can be cited as major factors.

1. Defective nature of plastic raw materials
2. Insufficient molding machine capacity
3. Defective mold design or structure
4. Improper setting of molding conditions
5. Improper settings in product design
6. Product requirements exceed the limits of injection molding

In addition to the above six points, it is possible to prevent plastic injection molding failure by paying due attention to external factors (foreign matter mixing, humidity, outside air temperature, etc.) and molding failure due to environments.