What causes the dimensional instability of injection molded parts?

What causes the dimensional instability of injection molded parts?

Introduction: Plastic parts processing is the process of converting synthetic resin or plastic into plastic products, generally including plastic ingredients, molding, mechanical processing, bonding, decoration and assembly. Due to the high application requirements of plastic parts, errors should be avoided during processing.

Plastic parts processing is the process of converting synthetic resins or plastics into plastic products, generally including plastic ingredients, molding, mechanical processing, bonding, decoration and assembly. Due to the high application requirements of plastic parts, mistakes in processing should be avoided.

The reason for the dimensional instability of plastic parts,

First, the equipment:

1, the feeding system is not normal.

2, back pressure instability or temperature instability.

3, hydraulic system failure.

Second, the mold:

1, gate and runner size is not uniform.

2, the size of the cavity is not allowed.

Third, the process:

1. Improper mold temperature or improper cooling circuit caused irrational mold temperature control.

2, injection pressure is low.

3, injection pressure is not enough time or fluctuations.

4, high barrel temperature or injection cycle instability.

Fourth, raw materials:

1. When the batch production is changed, the resin performance changes.

2, the size of the material particles is not the law.

3, greater moisture content.