food refrigeration work have since ancient times, with the development of modern technology and people's living habits, and the market demand change, life appeared a variety of food such as quick-frozen dumplings, ice cream, and food cold storage refrigeration technology is increasingly important.
as a food circulation in protecting food packaging bags, for some need to be refrigerated food, also need food packing bags to have low temperature freezing, cold storage features.
you know, the general plastic packaging materials in - temperature is reached
18 ℃, is likely to damage its packaging performance, and even cause food packaging bags break and leak, food packaging bags cannot be safely in protect the goods, that is ordinary food packaging can meet the conditions for use in low temperature environment.
And these are mostly related to the production of the packaging material at the beginning of food packaging, general packaging materials do not have cold resistance and cold resistance is poor.
So-called cold resistance of packaging materials, is refers to the flexibility and impact resistance of packaging materials in low temperature environment degradation, no longer tolerate the impact of the outside world.
to produce food packaging can protect the goods in low temperature environment, when select material should choose to have higher cold resistance of packaging materials, namely, compared to the standard conditions, impact resistance and other physical and mechanical strength of packaging materials, there was no obvious deterioration.
why general packaging materials under low temperature environment in the situation of the physical and mechanical strength degradation?
Or because the internal structure of polymer chemistry in the low temperature changed, thus to produce qualified can protect under low temperature environment may join in the raw materials for food packaging, toughening agent and other additives for finished product packaging, of course, cold resistance test is needed.
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