This is a frequently encountered problem. When professional injection molding cannot be solved through technical means, improvements can be made through mold design and manufacturing, and can usually be resolved.

The melting position of the screw of the injection molding machine reaches the set value, and this position is 0 (with a residual adhesive amount of 0) when the pressure of the injection molding is maintained. Possible reasons:

1. Glue leakage. In this case, professional injection molding processing first checks the injection molding machine barrel for leaks. Is there any leakage in the fitting position between the nozzle of the injection molding machine and the main liner of the mold. If there is glue leakage, it is a natural phenomenon, that is, if the product is not satisfied with the glue, it should be eliminated. The following inspection should only be carried out when it is confirmed that there are no molten adhesive leaks.

When professional injection molding products are not filled with glue and there is no glue leakage, it may be due to insufficient glue quantity. At this point, it is necessary to increase the melting stroke and glue amount. After increasing the melt stroke, continue to inject while observing the residual glue amount of the screw, the melt stroke, and the amount of glue applied to the product.

2. Insufficient glue amount. In professional injection molding, increasing the melt stroke results in an increase in the glue supply of the product, indicating a shortage of glue and the need to increase the melt stroke. When the melting stroke reaches and the product is still not filled with glue, you need to replace it with a larger model of injection molding machine.

3. The glue leaks through the glue meson. If the amount of glue in professional injection molding products does not increase correspondingly with the increase of melt stroke, it may be due to glue leakage from the injection molding machine.

Method for checking the leakage of glue mesons: Keep the product with a certain injection cycle in the mold cavity and switch to manual injection. The injection pressure increases from small to large. Observing the progress of screws can determine the leakage of gluons. When manually injecting glue into professional injection molding, the screw will not move forward, indicating that the glue meson is well sealed and will not leak glue. At higher injection pressure, allow the screw to advance a small amount. At this point, it is not the leakage of the melt, but the shrinkage of the melt under pressure.

When professional injection molding products are not satisfied with the glue, the first thing to check is whether there is any leakage between the injection molding machine barrel and the injection molding machine nozzle mold; Secondly, check if there is any leakage at the front end of the injection molding machine screw. Only after excluding these two conditions can other judgments be made.