The injection molding process is a manufacturing method used to produce various plastic products by melting the material and then injecting it into a mold under a specific pressure. Although widely used because it can produce large quantities of products with consistent shapes, this process still has the potential to cause product defects. Some common types of defects include short shots (incomplete mold filling), flash (excess plastic along the mold parting line), warpage (deformation of the product), and sink marks (indentations on the surface). These issues can be caused by improper temperature and pressure settings, inappropriate injection speed, uneven cooling, mold condition, or the quality of the raw materials used.

To prevent product defects, companies need to optimize injection molding machine parameters according to material characteristics and mold design. Controlling melt temperature, injection pressure, holding time, and cooling duration can help produce products with more consistent dimensions and surface finishes. In addition, regular mold inspection and cleaning, proper material drying, and monitoring of the production process are also essential. Operators should record production parameters and the types of defects that occur so that the causes of problems can be identified more accurately.

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