Common defects of plastic parts

     1. Shrinkage - a common defect in plastic parts. Plastic parts have dents on the surface due to shrinkage, and sometimes

you may see shallow pits on the surface of plastic parts, which is caused by shrinkage during transportation.

     Diagram of Shrinkage of Plastic Parts

     2. Airprint - This is also a common defect in plastic parts, where the air marks on the surface of the plastic part are slightly

different from the surrounding color and texture, which can be distinguished by the naked eye.

     Schematic diagram of flow pattern on plastic parts

     3. Material shortage - Plastic parts with material shortage are generally caused by insufficient glue during injection molding,

manifested as incomplete corners of the plastic parts.

     Schematic diagram of plastic parts shortage

     4. Sharp edge - refers to the rough edge of plastic parts, which is also a common defect. The rough edge of plastic parts is

generally small, and some low-end plastic products can often have sharp edges.

     Schematic diagram of plastic parts with sharp edges

     5. Pinching - This defect can also be seen in some low-end injection molded products, which generally affects the

appearance and does not affect the use.

     Schematic diagram of plastic clip line

     In addition to the common points mentioned above, there are also black spots, deformations, color leaks, scratches, burns,

dragging, top height, material patterns, oil stains, bumps, scratches, bubbles, color differences, burrs, stress marks, blurriness at

the adhesive position, multiple adhesives, adhesives, etc