Choosing the right shrink film: PVC vs. Polyolefin

Choosing the right shrink film for the right applications is important to assure adequate transport and protection of your goods.

Shrink film, also called shrink wrap, is a material made up of polymer plastic film. When heat is applied, it shrinks tightly over whatever it is covering. Heat can be applied with a handheld heat gun, or the product and film can be passed through a heat tunnel on a conveyor. Choosing the right, Shrink Film, Shrink Seal Machine and or Heat Tunnel and combination of, is vital to obtaining quality shrink packaging on your products.

PVC Shrink Film

PVC Shrink film is widely used for a variety of applications

The PVC stands for Polyvinyl Chloride. PVC is the third most produced plastic in the world. PVC Shrink Wrap was the most commonly used shrink film, until the introduction several years ago of polyolefin (POF) shrink wrap. Common PVC shrink wrap uses include packaging boxes, CD and DVD packaging, software, small canisters and other non-edible items.

PVC shrink film also works very well with automated machines. Sealing strength, storage issues and sealing by products are of the most common drawbacks of PVC shrink wrap. The plasticiser in PVC shrink wrap hardens in cold conditions and softens under hot conditions, therefore compromising the strength of the seal and the plastic. PVC shrink wrap also releases small quantities of Hydrogen Chloride gas into the air and carbon deposits into the sealer. Proper ventilation is required when sealing PVC shrink wrap.