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Change "face"

Andrew Mills, a professor at Strastry University University in the United Kingdom, is leading researchers to develop this smart packaging bag.

If the food, fish and vegetables exceed the shelf life or the refrigerator for too long, the freshness will be damaged. According to the idea of the Mills team, when the freshness drops to a certain boundary, this smart plastic packaging bag will change the color. This also reminds people to store sealed food in the refrigerator.

If the packaging is damaged to endanger the quality of food, this plastic bag also has warnings.

Researchers say it can also help people distinguish between "best edible periods" and "quality shelf life", so they don't have to worry about eating bad stomachs.

Be able to breathe

The "freshness indicator label" that people usually use is a label placed in the food packaging bag, and the cost is not low.

Mills and others want to develop a new indicator of indications that make it integrated with plastic bags, thereby reducing costs. Mills said: "The current" air -conditioned packaging bag "promoted is mainly to suppress organic matter to break down food, but the price is considerable. We plan to develop new plastic products to reduce the price."

The new food packaging bag will have the "ventilation" function like air conditioning, extending the food preservation period. "Air conditioning" is not to adjust the temperature, but to reduce the amount of oxygen in the sealing bag, and fill the nitrogen and carbon dioxide to reduce the natural rotten rate of food.

If the oxygen value in the bag exceeds the predetermined value, the plastic bag will also change the color.

Help

According to official statistics, about 8.3 million tons of food are thrown away from British families each year, and 364,000 tons of edible foods are thrown away because of exceeding the "best edible period" each year, of which 39,000 tons of food have not yet been opened.

Mills said: "Now people throw too many foods. Whether for environmental or economic development, this is a destruction."

Mills said the first batch of smart packaging bags will be listed within two years. This will help housewives reduce waste.

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