When such problems occur, it is necessary to observe the movement stroke of the screw of the injection molding machine while injection molding. Pay special attention to the position of the screw when the pressure is completed and when the glue is completed.
In the first case, the screw position of the injection molding machine reaches the set value, and the position of the injection molding pressure is 0 (the residual glue amount is 0). Possible causes:
1. Leakage. In this case, first check the injection molding machine barrel for leaking glue; whether the matching position between the injection molding machine nozzle and the main bushing of the mold leaks. If there is leakage of glue, the product is not full of glue is a natural phenomenon, should be excluded first. The following checks are performed only if it is confirmed that there is no melt leakage.
When the product is not full of glue, and there is no colloid leakage, it may be insufficient. At this time, it is necessary to increase the melt stroke and increase the amount of glue. After increasing the melter stroke, continue to observe the residual glue amount of the screw, the course of the melt glue and the feeding condition of the product while injection molding.
2. The amount of glue is not enough. After increasing the melt glue stroke, the product is increased in glue, indicating that the amount of glue is not enough, and it is necessary to continue to increase the melt stroke. When the melt stroke reaches the maximum and the product is still not full, you need to replace the large injection molding machine.