The soft type is based on plastic film. Thick and hard packaging, such as slightly thicker paper packaging boxes, composite aluminum foil stamping containers, etc., with the former accounting for a larger proportion. The commonly used frozen food packaging in the market now adopts OPP/LLDPE structure. The product performance of this structure can achieve moisture-proof, cold resistant, and strong low-temperature heat sealing tensile strength, and the cost is relatively economical; The packaging performance of NY/LLDPE structure can withstand freezing, impact, and puncture, and the cost is relatively high. The product packaging performance is good. PET/LLDPE and PET/NY/LLDPE and PET/VMPET/LLDPE structures are also used in frozen products, but the usage rate is relatively low.