1. Different color points
Impurities of different colors of plastic products are likely to be exposed on the product surface after production.
2. Gas wire
It means that the traces left by the gas on the product surface are different from the ground and present a shiny color.
3. Collapse
As the material shrinks, the entire surface of the product collapses.
4. Welding seams
During the molding process of the product, the hot melt material and the wiring formed afterwards are prone to appear, which can be seen with the naked eye and can be clearly touched by hand.
5. Lack of materials
The main reason is that after the product is produced, some parts are not full.

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