The molecular structure of the plastic box is a linear structure, which softens or melts when heated, can be molded into a certain shape, and hardens after cooling. It is softened again after being heated to a certain extent, and hardened after cooling. This process can be repeated several times. Such as polyvinyl chloride, polyethylene, polystyrene and the like. The thermoplastic molding process is relatively simple, can be continuously produced, and has a relatively high mechanical strength, so it has developed rapidly. As an important means of interpersonal communication, gifts have attracted people's attention and set off a boom in the market. 

Since it is a gift, its packaging design is an important indicator of the quality of gifts. Therefore, more exquisite gift boxes have flooded into the market, and the scope of use of gift packaging has been expanded. It is used for festival gifts, door visits, company benefits, etc. Gift box products are mostly for collections, boutiques, collections, etc. Regardless of the application, the material of the gift packaging design can not be ignored. Plastic box material: ABS: ABS resin is one of the five synthetic resins, which is excellent in impact resistance, heat resistance, low temperature resistance, chemical resistance and electrical properties, and also easy to process. PC (polycarbonate): English Name: Polycarbonate, high performance impact strength, good dimensional stability, colorless and transparent, good coloring, electrical insulation, corrosion resistance, wear resistance, but poor self-lubrication, stress cracking tendency, high temperature easy to hydrolyze, Poor compatibility with other resins. PVC: (Polyvinyl chloride) chemical and physical properties Rigid PVC is one of the most widely used plastic materials. PVC material is a non-crystalline material. 

PVC materials are often added with stabilizers, lubricants, auxiliary processing agents, colorants, impact agents and other additives in actual use. Recognizing the recycled plastic in the strawberry packaging box, the recycled plastic is prohibited by the state from being used on food packaging. Its main component, polyvinyl chloride, is a toxic chemical raw material. When it encounters acidic and oily substances, the toxic components will be released. . The moon cake itself has a relatively large oil content, and the packaging products using recycled materials are easily contaminated.