Crystal point: In the course of production of thick piece plastic blister, a kind of transparent enamel is produced on the heated plastic material due to tiny dust in the air, especially in the production process of transparent plastic blister sheet. When it is too large, it is considered to be defective.

Scratches: Dongguan plastic box, especially on the transparent bubble shell with scratches on the traces, if the traces are too long, too large, blister has become defective, can not be used for higher packaging.

Bubbles: During the plastic sheet production process, air bubbles are contained in the heated plastic box, which results in air bubbles in the produced sheet, especially in the transparent plastic sheet production process. Too much is considered defective.

Pulling: Some of the unintentional lines protruding from the plastic box molding production in Dongguan must be re-moulded and additional pressure moulds must be added. When the cable is too large, it is regarded as a defective product, and it cannot be used for high-grade blister packaging. However, in the category of component rotating trays, as long as the cable is uniformly divided and does not affect Liqin’s performance, it should be regarded as a qualified product. Pull lines are also called: La Qiu, cramps and so on.

Water ripple: During the production process of plastic sheet, due to different materials and processing techniques, the surface of the produced product sheet has surface ripples, especially in the production process of transparent plastic sheet. If it is too much, it is considered inferior. Under normal circumstances, the thicker the sheet, the more pronounced the water ripples. Qualified PET materials have few water ripples, but most PVCs have signs of water ripples.

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