Classification Of Plastic Wrap
Aug 02, 2022
Most of the plastic wrap and commonly used plastic bags on the market are made of vinyl masterbatch. According to the different types of vinyl masterbatch, the plastic wrap can be divided into three categories.
The first one is polyethylene, referred to as PE, which is mainly used for food packaging. The film we usually buy for fruits and vegetables, including semi-finished products purchased in supermarkets, is made of this material;
The second is polyvinyl chloride, referred to as PVC, this material can also be used for food packaging, but it has a certain impact on the safety of the human body;
The third is polyvinylidene chloride, referred to as PVDC, which is mainly used for the packaging of some cooked food, ham and other products.
Among these three kinds of plastic wrap, the plastic wrap of PE and PVDC is safe for human body and can be used with confidence, while PVC plastic wrap contains carcinogens, which is more harmful to human body. Therefore, when purchasing plastic wrap, PE cling film should be used.
From a physical point of view, the plastic wrap has moderate oxygen permeability and moisture permeability, which can adjust the oxygen and moisture content around the fresh-keeping product, block dust, and prolong the fresh-keeping period of the food. Therefore, it is necessary to use different plastic wrap for different foods.
The plastic wrap on the market is roughly divided into two categories, one is ordinary plastic wrap, which is suitable for refrigerator preservation; the other is microwave plastic wrap, which can be used for both refrigerator preservation and microwave oven. The latter plastic wrap is far superior to ordinary plastic wrap in terms of heat resistance and non-toxicity. Therefore, consumers should pay special attention to the choice of use and use them separately.
