1.Crystal point: In the production process of plastic sheet, due to the fine dust in the air, it is dropped on the heated plastic material, resulting in a transparent flaw, especially in the production process of transparent plastic sheet. When the species is too large and too much, it is considered as defective.

2. Pull wire: some undue line protrusions (not on the mold) generated during the production of plastic molding, need to re-modify the mold (reduced height and increase the degree of smoothness) and add additional pressure mold (we call it on Model) to solve. When the cable is too large, it is regarded as a defective product and cannot be used for high-grade blister packaging. However, in the area of component rotating trays, as long as the cable is arranged neatly and does not affect the function, it should be regarded as a qualified product. Pull lines are also called: La Qiu, cramps and so on.

3. Scratches: Scratch marks on the blister product, especially transparent blister. If the marks are too long or too big, the blister will become defective and cannot be used for high-grade packaging.

4. Water ripple: In the production process of plastic sheet, due to the difference in materials and processing technology, the surface of finished product sheet has surface ripples, especially in the production process of transparent plastic sheet. If it is too large or too much, it is considered as defective. In general, the thicker the sheet, the more pronounced the water ripples. Qualified PET materials have few water ripples, but most PVCs have water ripples.

5. Bubbles: In the production process of plastic sheet, the heated plastic material contains air, so that the resulting finished product sheet has air bubbles, especially in the production process of transparent plastic sheet. When it is too large, it is considered to be defective.

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