How to prevent the phenomenon of shrink film aging?

In the process of processing, storage and use of PVC heat shrinkable film, under the action of light, heat and oxygen, aging phenomena such as fading, embrittlement and cracking will occur. In order to delay the aging of PVC heat shrinkable film, stabilizers must be added. Those used to prevent thermal aging are called heat stabilizers; those used to prevent oxidative aging are called antioxidants; those used to prevent light aging are called light stabilizers, collectively called stabilizers.

PVC heat shrinkable film is a white amorphous powder. Its branching degree is small, the relative density is about 1.4, the glass transition temperature is 77-90℃, and the initial decomposition temperature is about 170℃. Poor stability to light and heat. When the sunlight exceeds 100℃, it will further catalyze decomposition, make the chloride ion fade, and its physical and mechanical properties are also sensitive to attenuation, so adding stabilizers in the production process will improve the thermal stability and light stability and delay the aging of the shrink film The phenomenon occurs.