POF Shrink Wrap Bags Heat Shrink Wrap for Packagaing Soap,Candles,Shoes,Gifts, Jars and Homemade DIY Projects and Food

POF introduction

POF is an abbreviation, which means heat shrinkable film. The full English name is Polyolefin (POF). Generally speaking, heat shrinkable film is POF, or Polyolefin Shrink Film.

POF is composed of linear low-density polyethylene as the middle layer (LLDPE)), co-polypropylene (PP) as the inner and outer layers, plasticized and extruded through three extruders, and then formed by a die and inflated by a film bubble. It is processed by special processes, and finally made into POF frosted bags after folding and hot cutting.

The heat-shrinkable film is designed with the principle of stretching and orientation of the high-density molecular chain and is formed by the method of rapid cooling and shaping. The physical principle is: when the ionomer is in a highly elastic state, its orientation is stretched, and then the polymer is quenched to below the glass transition temperature, the molecular orientation is frozen, and when the article is heated during packaging , Due to the stress relaxation caused by molecular motion, the molecules return to their original state and contraction occurs.

To put it simply, the manufacturing process is to stretch the internal molecules of the product, and then heat it. The molecules restore their original order and produce a shrinkage effect. POF has a wide range of applications because of its high gloss and strong strength. Toughness, tear resistance, uniform heat shrinkage and other characteristics.

it is a replacement product of traditional PVC heat shrinkable bags, and is often used for packaging in books, photo albums, tobacco and alcohol, food, glass products, gift boxes, etc.