However, as people on food more and more the pursuit of the original flavor, add preservatives, freezing, drying dehydration have been unable to meet consumer demand for food packaging. Modified atmosphere of latest technology, more and more show its advantages in market, the technology of modified atmosphere by pumping the air in the food packaging net through accurate gas mixed instrument will allocate a good proportion of fresh gas into the packaging, thus suppressing both aerobic bacteria breeding, food preservation, keep food color, aroma and taste. The advanced technology has been widely used abroad, gas mixed technology in the domestic market has also been rapid recognition, and in the gas switch installed with domestic leading technical level, effectively control the residual oxygen packaging to < 0.5%, thus good preservation effect.

As the market demand is becoming more and more mature and rational, controlled atmosphere packaging for food in China will thrive in a short time, become the mainstream of consumer choose and buy food, domestic traditional factors influence, how to market to buy food, but increasingly highlight the food safety problems, common preservation methods cannot meet people's needs, gas switch installed on the packing inside the precise control of the gas, the major retailers in the supermarket has a 100% pre-packaged meat, people's consumption habits are changing.

At the beginning of the gas switch installed into China, has experienced a difficult period, this is mainly caused by our eating habits is different from European and American people, because the European and American people like to go to the supermarket to buy that kind of packaged product now, while Chinese people like to go to a restaurant, or in the market to buy fresh meat food and then go home cooking. We can find that gas packaging is a kind of inevitable development trend, in Germany, for example, 20 years ago, German and Chinese, also like to go to a butcher's shop to buy meat, no gas packing, but now to go to Germany or the Netherlands supermarket cold fresh look on the counter, whether it's meat, cooked food, cheese and vegetables, a lot of products by packaging. It's the same in China, with the development of the society, more and more young people will go to the supermarket to buy all kinds of packaged food, with air packaging of food best quality preservation.

Gas switch installed with the method of closed vacuum replacement in the food fresh-keeping packaging, namely in the vacuum chamber is fully closed state, the use of high vacuum pump, vacuum oxygen make vacuum indoor constitute a high vacuum degree, and then into suitable for keeping food fresh over extended gas. This way of packing can make container residual oxygen content is low, to accurately control the proportion of various gases, gas replacement rate is 99.5% or higher, effectively solve the traditional flush compensating air packaging due to a high content of residual oxygen preservation effect not beautiful, filling the gas proportion inconsistency, unable to grasp and control the shelf life of fresh food problem.