Polyolefin Shrink Film is a mixture of PP and PE material in the film. When PE is more in the film, it is normally called PE based shrink film. If the PP is more, it is called PP based. For those PE based polyolefin shrink film, cross-linked sometime is added so that the film has a better property in terms of tensile strength and sealing strength.
PP based polyolefin shrink film normally has better clarity and machinerity. The sealing time normally shorter and when there is a high speed requirement, PP based polyolefin shrink film is normally selected.