Vacuum forming knowledge and common sense

Vacuum cutting: After vacuum forming, plastic products are punched and large sheets are cut into individual products using a cutting die. Folding: There is a type of blister packaging called card insertion packaging, which requires folding the three edges of the blister to the back with a folding machine, so that in the next packaging process, the paper card can be inserted into the folding edge to form card insertion packaging. Heat sealing: It is a vacuum sealing process. Use a sealing machine to heat seal the paper card coated with vacuum forming oil onto the blister shell, forming a suction card packaging. High frequency sealing: It is a vacuum packaging process that uses a high-frequency machine to generate high frequencies and bond the shells together to form a double shell packaging. Ultrasonic sealing: It is a vacuum packaging process that uses an ultrasonic machine to generate ultrasonic waves and bond the bubble shells together to form a double bubble shell packaging. Unlike high-frequency sealing, ultrasonic waves can not only seal PVC, PETG materials, but also PET materials, and do not cause electromagnetic damage to the packaged products, making it particularly suitable for electronic product packaging. What are the commonly used plastic sheets for vacuum packaging? What are their characteristics? The sheets used for vacuum packaging are called hard sheets or films, and commonly used ones include PET (polyethylene terephthalate) hard sheets, PVC (polyvinyl chloride) hard sheets, and PS (polystyrene) hard sheets. PS hard sheets have low density, poor toughness, and are easy to burn. When burned, they produce styrene gas (a harmful gas), so they are generally used to produce various industrial vacuum formed trays. PVC hard sheets have moderate toughness and are not easy to burn. When burned, chlorine gas is produced, which has a certain impact on the environment. PVC is easy to heat seal and can be sealed with sealing machines and high-frequency machines. It is the main raw material for producing transparent vacuum formed products. PET hard sheets have good toughness, high transparency, and are easy to burn. They do not produce harmful gases when burned, making them environmentally friendly materials. However, they are expensive and suitable for high-end vacuum formed products. In European and American countries, PET hard sheets are generally required for vacuum formed shells, but they are not easy to heat seal, which brings great difficulties to packaging. To solve this problem, people composite a layer of PVC film on the surface of PET, named PETG hard sheets, but the price is higher.