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refrigeration freed. Different concentrations of different fresh fruits and vegetables needed oxygen and carbon dioxide, packaging technology for this feature is also under development. California company is developing ~ kinds of packaging film, this film can change its permeability with temperature, to meet the different needs of different fruits and vegetables on the oxygen and carbon dioxide. In New Zealand, the researchers developed a fruit packaging, the packaging can be directed such as peaches afraid afraid of pressure to squeeze the fruit when ripe. Food Technology researchers estimate that 20 to 40 percent of future food packaging will apply "active packaging" technology. Food packaging researchers found that some materials can absorb oxygen packaging bag; gas produced when some materials will be interacting with food spoilage, change colors; some material change in temperature will change color. If such material packaged foods, will be conducive to preventing oxidative deterioration of food, or provide more information on the safety of food for consumers. There is growing concern about food safety and a strong demand for reducing the loss of perishable foods and medicines will stimulate market demand for smart packaging. 

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