The main characteristics of PVC come from the added plasticizers, which are thick, hard and brittle, and have less transparency. PVC is classified as an unencumvant shrink film because it releases toxic gases such as hydrogen chloride and chlorine gas when PVC is burned, and is not suitable for direct contact with food, as some toxic additives may seep out. When storage time is long and the plasticizer effect disappears over time, the PVC shrink film will turn yellow and brittle. In addition, PVC is very sensitive to temperature, when stored at low temperatures, PVC will become very vulnerable, when stored at 40-50 degrees may shrink and go bad, so PVC should be stored at room temperature below 25 degrees.
The main components of POF shrink film are PE and PP, unlike PVC, POF is a soft environmentally friendly shrink film that does not release toxic gases during combustion and can also come into direct contact with food. POF shrink film is made up of multiple layers of PE or PP film, which gives POF a variety of different properties, such as soft texture, toughness, high transparency and high shrinkage. POF is low temperature sensitive, does not become brittle and yellow at low temperatures, and does not shrink at 40-50 degrees.