Packaging is an effective means of food preservation and an important tool for food circulation. It can prevent or reduce various damages that may occur during food processing, storage, transportation and sales, prevent damage caused by microorganisms and other organisms, and prevent chemical properties and Physical deterioration, extending the shelf life of food.
Vacuum packaging is one of the many food packagings. It uses the method of squeezing to remove excess air from food to seal the food and reduce the oxygen content in the packaging bag. It can prevent the deterioration of the food and the original color and fragrance of the food. Flavor, extended shelf life is longer than regular packaging. Because microorganisms attached to the surface of food can only reproduce in the presence of oxygen, vacuum packaging can make the growth and reproduction of microorganisms lose their condition. For microorganisms, when the oxygen concentration is equal to or lower than 1%, the growth rate of microorganisms drops sharply. When the oxygen concentration is 0.5%, most bacteria are inhibited and stop breeding, and the oxidative deterioration of fat-containing foods is in oxygen. When the concentration is equal to or lower than 1%, it can be effectively controlled, so vacuum packaging is an effective packaging method to protect the quality of food by causing hypoxic conditions in the package, and proper sterilization after vacuum packaging is more conducive to extending the food. Storage period. Vacuum packaging has the disadvantage that the packaged food is subjected to a certain pressure due to the imbalance of internal and external pressure. Therefore, if the vacuum packaging bag is damaged or flatuled, the general food will deteriorate in a short period of time, that is, it cannot be practical.
Vacuum packaging requires the use of airtight packaging materials. Because blocking oxygen is a key issue, the choice of packaging materials should be able to effectively prevent the infiltration of oxygen in the atmosphere. It is used as a vacuum packaging plastic film, generally requiring less oxygen permeability, such as Films such as PET, PA, PVDC and EVAL have good gas barrier properties. However, considering the heat sealability of the film material and the barrier property to water vapor, these materials are generally not used alone, and often have good heat seals such as PE and PP. The performance film is combined with the composite material with better comprehensive packaging performance. For the flavored product, the package is required to have light-proof and display effect, and the composite packaging material with aluminum foil as the substrate can be selected. The aluminum foil in the composite film is characterized by being opaque, moisture impermeable and oxygen impermeable. The vacuum packaging machine has a chamber vacuum packaging machine, a belt vacuum packaging machine, a rotary vacuum packaging machine, a thermoforming vacuum packaging machine, and the like.
At present, there are many enterprises that use vacuum packaging food. For example, Changzhou Zunlong Food Co., Ltd. is the key leading enterprise of agricultural industrialization in Jiangsu Province. It specializes in processing and selling agricultural and sideline products mainly based on meat duck. The main product pearl sauce duck is used after high temperature sterilization. The two-layer plastic film is vacuum-packed and has a shelf life of 170 days. It has been rated as Jiangsu Famous Brand and China Green Food for many times.
China's vacuum packaging technology was developed in the early 1980s, and vacuum aerated packaging technology began to be used in small quantities in the early 1990s. With the improvement of the technical level of China's agricultural product processing industry and food manufacturing industry, with the promotion of small packaging and the development of supermarkets, vacuum packaging technology will bring better storage and preservation effect to food, and more and more food enterprises and consumption. The popularity of vacuum packaging is becoming more and more extensive, and some will gradually replace hard packaging, and the prospects are very promising.
TianYang Precision Mold company is an excellent Vacuum packing machine hole punch manufacturer