The technical requirements of modern people's frozen packaging

Packaging materials must have the following conditions: a certain degree of mechanical strength (high and low temperature resistance), barrier properties (high gas and liquid barrier properties), tolerance to contents (acid and oil resistance), hygienic properties, and durability Operational.

In recent years, with the rapid development of supermarkets and chain stores and the formation of cold chain, frozen food has become more and more popular. According to relevant department statistics, the current annual output of frozen food in China has reached about 6.5 million tons, and it is increasing at a rate of 25% per year, and the per capita annual consumption has approached 10 kilograms. With the increasing popularity of frozen food packaging, frozen food packaging also imposes higher requirements on the performance of packaging materials.

The basic function of frozen food packaging is from production, transportation to sales, maintaining the product's quality characteristics, preventing bacterial contamination and eating convenience. For this purpose, packaging materials must have the following conditions: a certain degree of mechanical strength (high and low temperature resistance), barrier properties (high degree of gas and liquid barrier properties), tolerance to contents (acid and oil resistance), Hygienic, resistant to handling.

At present, there are two major types of frozen food packaging: soft type and hard type. The soft type is based on a plastic film. Thick and hard packaging, such as slightly thicker paper boxes, composite aluminum foil stamping containers, the former accounted for a large proportion. The common frozen food packaging on the market now uses the following structure: OPP/LLDPE. The structure can achieve good moisture-proof, cold-resistant, low-temperature heat-seal, etc. The cost is relatively economic; NY/LLDPE structure can withstand freezing, impact resistance, puncture, the cost is relatively high, the product packaging performance is good; PET/LLDPE and PET Structures such as /NY/LLDPE and PET/VMPET/LLDPE are also used in frozen products, but their use is relatively low. There is also a simple PE bag, such as vegetable packaging. The above several product structures are relatively concentrated in the packaging of low-temperature frozen products in the domestic market.

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