Although the plastic parts have been formed smoothly, there have been some unfavorable problems, which will not only affect the assembly efficiency or the performance of the whole machine, but also make certain differences with the predetermined quality standards, which cannot meet the quality requirements of users. These defects of plastic parts may be caused by various factors such as mold, raw materials, process parameters, equipment, environment, personnel, etc., so it is necessary to strictly manage these aspects.

The common quality problems of plastic parts are: color difference, that is, the color of the plastic parts is under the standard light source, and the single standard color sample is different from the naked eye; if the injection is not full, it means that the plastic is not filled and the cavity is not full. Including bubbles, voids, shrinkage holes, and the like.

Warpage deformation is also a common problem in plastic parts. The shape of the plastic part is rotated and twisted after the plastic part is demolded or some time later. If there is a straight side facing inward, or it is bent outward or the flat part has undulations, there are local parts. And the overall deformation. At the same time, there are weld marks and corrugations. The former refers to the linear traces on the surface of the plastic parts, which are formed by the convergence of plastics in the mold, and the melts are not completely fused together at their intersections, and cannot be melted into one another. The latter is usually present on the surface of the plastic part, a spiral or cloud-like waveform unevenness.