1. Thick-sheet thermoforming Trailing line: During the thermoforming of thick‑walled blister packs, factors such as the mold cavity’s height‑to‑width ratio, viewing angle, and demolding design can cause a raised edge line to form along the product’s perimeter. In severe cases, this can adversely affect the appearance and is typically classified as a defective item.
2. Color Tone: Color tone variations typically arise during the formulation process at plastic sheet manufacturers, and different batches may exhibit slight background color differences. However, this issue generally poses minimal risk and is difficult to detect when products are individually packaged. Therefore, it is crucial to communicate directly with the plastic sheet manufacturer regarding this matter.
3. Perforation in Thick-Section Blister Molding: During the entire forming process, uneven raw material thickness and unstable temperature control can lead to perforations. Products with such defects are typically classified as substandard and are not released from the warehouse as conforming goods.
4. Scratches: Thick-sheet thermoforming The surface is highly susceptible to scratches and abrasions. During manufacturing and packaging, improper handling can result in surface damage and visible marks on blister-packaged products; in severe cases, this can render the product defective.
5. Deformation: Thick-sheet thermoforming The key causes of deformation include temperature fluctuations, gas bubbles in the raw material, and residual impurities. All these factors can lead to shrinkage‑induced deformation; if shrinkage is not addressed promptly, the product will fail to achieve the required molded shape, making it impossible to package and resulting in defective, scrap items.
6. Wave Pattern: The key lies in the processing of the plastic sheet. Surface waviness is a more common issue with polyvinyl chloride (PVC) sheets, and it is generally acceptable under normal circumstances. However, excessive waviness can lead to wasted high‑grade packaging and result in defective products; improvements must be addressed through the plastic sheet manufacturer.
7. Thick-sheet thermoforming Blisters: Typically arise during the processing of raw materials when gases permeate into the plastic, resulting in blistering. In such cases, large blisters can adversely affect the appearance, rendering the product defective.