Some common problems in injection mold molding and improvement measures

A set of successful molds can be reflected in product appearance, assembly and production efficiency. Problems that are prone to occur in injection mold molding include batching, excess glue, lagging, insufficient filling, wrinkles and pockmarks, overflowing edges, weld lines, shrinkage, cracks, warping, deformation and other problems.

Some can be improved by adjusting the machine on the injection molding machine, and some can be controlled by the design of the injection mold to prevent the backflow of the injection mold from being sluggish, or the uneven cooling caused by the poor molding of the injection mold, resulting in surface defects and deterioration.

1. The wall thickness should be as uniform as possible, and the demolding slope should be large enough.

2. The transition part should be gradually smooth transition to prevent sharp corners. Sharp edges are generated, especially PC products must not have gaps.

3. The surface of the mold should be smooth and clean, with low roughness, less than 0.8MM will be better.

4. The gate runner should be as wide and stubby as possible. The gate position should be set according to the shrinkage and condensation process, and a cold well should be added if necessary.

5. The exhaust holes and grooves should be sufficient to discharge the air and the gas in the melt in time.

6. Except for pet, the wall thickness should not be too thin, generally not less than 1mm.