1. Thick sheet thermoforming Hanging lines: During the thick sheet thermoforming process, due to factors such as the height and width of the mold shell, viewing angle, and demolding structure, a line frame protrusion may appear at the edge of the product. In severe cases, this can affect the appearance and the product is usually considered a defective product.
2. Hue: Hue differences generally appear in the materials used by the plastic sheet manufacturers. Different batches of plastic sheets may have different background color differences, but this situation is not likely to cause significant harm. It is also difficult to distinguish when individually packaged, so this situation should be discussed with the plastic sheet manufacturer.
3. Perforation in thick sheet thermoforming: During the entire forming process, due to uneven raw material thickness and unstable temperature control, perforation may occur. Products with perforations are generally considered defective products and are not shipped as finished goods.
4. Scratches: Thick sheet thermoforming Scratches and abrasions can easily appear on the surface. During the processing and packaging procedures, if not handled properly, the surface of the blister product will be scratched and leave marks, and in severe cases, it will become a defective product.
5. Deformation: Thick sheet thermoforming The key reasons for deformation are temperature adjustment, raw material bubbles, and residue, all of which can cause thermoforming deformation. If the suction is not timely and does not meet the thermoforming specifications, the packaging object cannot be placed inside, resulting in defective and discarded products.
6. Waviness: This mainly depends on the processing of the plastic sheet. Surface waviness of polyvinyl chloride plastic sheets is a more common phenomenon, which is generally acceptable. Large waviness will waste high-standard packaging, making it a defective product, and can only be improved by the plastic sheet manufacturer.
7. Thick sheet thermoforming Bubbles: Generally appear during the processing of raw materials, where gas penetrates into the plastic, causing bubbles. In this situation, large bubbles will affect the appearance, and these will become defective products.