The primary cause of insufficient injection in molding products is a lack of material and improper injection pressure and speed (including pressure loss due to resistance). This issue may be attributed to several factors:

One: Injection Molding Machine Reason:

1. The plasticizing amount or heating rate of the machine may be inconsistent; it is recommended to choose a machine with a higher plasticizing amount and heating power.

2. Wear between the screw and the barrel or the extruder head, etc., leads to recycled material and results in actual molding volume discrepancies.

3. Faults in heating systems such as thermocouples or heating rings result in the actual temperature of the extruder being too low.

4. Worn sealing elements in the injection cylinder cause oil leakage or backflow, preventing the achievement of the required injection pressure.

5. Excessive resistance and pressure loss due to too small of an injection nozzle hole or improper adjustment of the nozzle centering.

II. Injection Molding Mold Reason:

Insufficient temperature in the mold, either locally or overall, can lead to difficulties in feeding materials; it is advisable to increase the mold temperature appropriately.

2. The distribution of the mold cavity is unbalanced. The excessively thin wall thickness of the workpiece causes excessive pressure loss and inadequate filling. It is recommended to increase the wall thickness of the entire workpiece or locally, or to set up auxiliary flow or gate near the underfilled areas to resolve the issue.

The mold's runner being too small causes pressure loss, too large leads to insufficient injection force, and excessive roughness results in unsatisfactory parts. The size of the runner should be appropriately set, and transitions or bends between the main runner,分流 runners, and gates should be smoothly rounded.

4. Poor mold venting. The material entering the mold cavity is blocked by gas pressure that cannot be evacuated in time, resulting in incomplete filling. Full use can be made of the screw gap for venting or reducing clamping force to vent through the parting surface. In necessary cases, venting channels or holes should be opened.