The most convenient packaging material-preservative film
Modern families can be said to have come to the era of cling film, the use of food cling film for packaging has become a very common phenomenon. People have also been accustomed to packaging the remaining food after eating with fresh-keeping film. This kind of material that can be easily packaged by hand is also welcomed by everyone. This very thin material, which is only about 10μm, has the characteristics of viscosity and toughness. It can also be easily covered repeatedly and increase its fastness. It is difficult to distinguish the difference between the fresh-keeping film and the ordinary plastic from the appearance. In fact, the fresh-keeping film also has four special types : one is the PVDC material, which has a strong blocking function for air, water vapor and taste, and has heat resistance. Therefore, it also plays an important role in the use of microwave ovens and other processed foods. The second is the material of PMP, this kind of preservative film is characterized by the air and taste is not very strong, can also be said to have a breathable effect, but its heat resistance is very strong, so it is also used in microwave oven heating materials ; the other two materials are LDPE and PVC.These two materials are relatively cheap and easy to process and produce. They are widely used as preservative film materials.
In the supermarket, the fresh-keeping film used by people to package meat or fish and vegetables is mainly based on LDPE and PVC materials. As a fresh-keeping film used in the store, it is generally thicker than that used in the family, usually about 15μm. This thickness of the preservative film is relatively strong, but also has a stretch, its viscosity is stronger, when encountering heat will shrink, very suitable for use in supermarkets. From the current point of view, both family and society, the demand for preservative film is very obvious.
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