Textured ABS sheet, especially the transparent bubble shell, has scratch marks. In the production process of textured ABS sheets, due to different materials and processing technology, the surface of the finished sheet produced has water ripples, especially in the production process of transparent blister sheets, the water ripples are too large and too much, which is regarded as defective. In general, the thicker the sheet, the more obvious the water ripple. Qualified PET materials rarely have water ripples, but most PVC has water ripples.