Cords: Some unwanted line bumps (not found on molds) during blister production require a new mold change (lower height and increased landslide) and additional mold pressure (we call it the upper mold) To solve. Pull line is too large, was seen as defective, can not be used for high-grade plastic packaging, but in the field of parts turnover tray, as long as the pull line neatly, does not affect the use of function, should be considered as qualified. Pull the line, also known as: Rachoo, cramps and so on.
Scratches: Plastic products, especially transparent blister on the scratch marks, if the marks are too long, too large, the blister became a defective, can not be used for high-end packaging.
Crystal Point: In the production of plastic sheeting, the small dust in the air, dropped on the heated plastic material, resulting in a transparent defect, especially in the transparent plastic sheet production process, this flaw Too large, too much, as defective.
Bubbles: Blister in the production process, due to the heated plastic material containing air, so that the finished product sheet with bubbles, especially in the transparent plastic sheet production process, this bubble is too large, Too much time, as defective.
Water ripples: in the blister sheet production process, due to different materials and processing technology to produce the surface of the finished sheet surface ripples, especially in the transparent plastic sheet production process, this water ripple is too large , Too much, as defective. Under normal circumstances, the thicker the sheet, the more obvious water ripples. Qualified PET materials have few water ripples, but most PVCs have water ripples