Common Problems with Blister Packaging; 1. What are the common plastic materials used in blister packaging, and what are their characteristics? Answer: The sheets used in blister packaging are called rigid sheets or films. The commonly used ones are: PET (polyethylene terephthalate) rigid sheets, PVC (polyvinyl chloride) rigid sheets, and PS (polystyrene) rigid sheets. PS rigid sheets have low density, poor toughness, and are flammable. When burned, they produce styrene gas (a toxic gas), so they are generally used to produce various industrial blister trays. PVC rigid sheets have moderate toughness, are not easy to burn, and produce chlorine gas when burned, which has a certain impact on the environment. PVC is easy to heat-seal, and its edges can be sealed using a sealing machine and a high-frequency machine. It is the main raw material for producing transparent blister products. PET rigid sheets have good toughness and high transparency, are flammable, and do not produce toxic gases when burned, so they are environmentally friendly materials. However, their price is high, making them suitable for high-end blister products. Blister shells in European and American countries generally require the use of PET rigid sheets. But PET is not easy to heat-seal, which brings great difficulties to packaging. To solve this problem, a material called PETG (glycol-modified polyethylene terephthalate) is used. This material has the environmental friendliness and transparency of PET, but its price is slightly higher. 2. What is carded packaging? What issues should be noted in carded packaging? Answer: Carded packaging refers to a packaging form where a paper card is inserted into a transparent blister shell with three folded sides. Its characteristic is that no packaging equipment is needed during packaging; only manual work is required to install the product, blister shell, and paper card in place. The issues to be noted are: 1. The paper card and the blister shell with folded edges should be of appropriate size. If they are too tight when inserted together, both the paper card and the blister shell will be deformed; if they are too loose, they will easily separate. 2. When the product is too heavy, it is necessary to consider using a stapler to fix the paper card and the blister shell at a certain position. 3. What is blister-card packaging? What issues should be noted in blister-card packaging? Answer: Blister-card packaging refers to a packaging form where the product is placed on the surface of a paper card with blister oil, and the blister shell is thermally bonded to the paper card by a blister machine. Its characteristic is that blister equipment is required to seal the product between the paper card and the blister shell. The issues to be noted are: 1. The paper card must be coated with blister oil (to enable thermal bonding with the PVC blister shell); 2. The blister shell can only use PVC or PETG materials; 3. Since the blister shell is only bonded to the surface of the paper card, the packaged product should not be too heavy. 4. What is double-blister packaging? What issues should be noted in double-blister packaging? Answer: Double-blister packaging refers to a packaging form where a paper card and the product are sealed together using two blister shells. Its characteristic is that a high-frequency machine is required to seal the edges of the double blister shells, resulting in low efficiency and high packaging costs. However, the edges are neat and beautiful, and the product has a high-end appearance. The issues to be noted are: 1. The blister shells can only use PVC or PETG sheets; otherwise, thermal bonding cannot be achieved or the thermal bonding effect will be poor; 2. The quality of the high-frequency mold determines the quality of the edges of the double blister shells; 3. Recently, high-frequency machines that can heat-seal PET have appeared, but their price is high and the process is not yet very mature. 5. What is half-blister packaging? What issues should be noted in half-blister packaging? Answer: Half-blister packaging refers to blister packaging with a half-blister shell. It uses two blister shells to seal the paper card and the product together, with part of the product exposed outside the blister shell. It is suitable for particularly long products. Its characteristic is that manual work is required to first cut open the part of the blister shell where the product is placed with scissors, and then use a high-frequency machine to seal the edges of the blister shell. This results in low efficiency and high packaging costs, but it has a good visual effect and can meet the needs of users to touch the product directly when selecting it in supermarkets. The issues to be noted are: 1. Products that are easy to wear should not use this type of packaging; 2. When cutting the blister shell, attention should be paid to keeping the edges neat; 3. The blister shell must use PVC or PETG rigid sheets. 6. What is external half-blister packaging? What issues should be noted in external half-blister packaging? Answer: The full definition of external half-blister packaging is that the entire product is placed outside the double blister shells. Only two blister shells are used to seal the paper card and the product together, and they serve as the base support for the head of the product. The product and the blister shells are connected with plastic straps. Its characteristic is that a high-frequency machine is required to seal the edges of the double blister shells and punch hanging holes on them. It has the lowest efficiency and the highest packaging cost, but it can meet the needs of users to touch the product. 7. What is external half-blister packaging? What issues should be noted in external half-blister packaging? Answer: The full definition of external half-blister packaging is that the entire product is placed outside the double blister shells. Only two blister shells are used to seal the paper card and the product together, and they serve as the base support for the head of the product. The product and the blister shells are connected with plastic straps. Its characteristic is that a high-frequency machine is required to seal the edges of the double blister shells and punch hanging holes on them. It has the lowest efficiency and the highest packaging cost, but it can meet the needs of users to touch the product. 8. What is three-fold blister packaging? What issues should be noted in three-fold blister packaging? Answer: Three-fold blister packaging is a form where the blister shell is folded into three sides (front, bottom, and back), usually forming a bottom edge so that the product can stand on a flat surface. Its characteristic is that the high-frequency edge-sealing process is not required; instead, the blister shell is connected by gluing at a certain position. If necessary, staples can also be used. In terms of material selection, PET rigid sheets can be used to achieve the goal of using environmentally friendly materials, and it is suitable for packaging products with large calibers. The issues to be noted are: 1. Since there is no high-frequency edge sealing, the edges need to be cut with high quality on a cutting machine; 2. The tightness of the adhesive fastener should be moderate.