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Polyolefin films have been developed to offer the best attributes of PVC - ease of sealing and shrinking - without its demerits - the issues noted above with regard to use and storage. Polyolefin shrink films also produce fumes on sealing and it is also appropriate to use ventilation. The shrink window of polyolefin is not quite as flat as with PVC and hence, shrink wrap equipment generally needs to be of quite a good standard to provide a good shrink wrap result.
Nevertheless, polyolefin will offer stronger seals than PVC and good quality shrink down. There are no real issues with pre or post production storage. Overall, polyolefin represents a better mix of the best attributes and as a consequence its share of the shrink wrap market has grown.
Environmental concerns are another shrink film issue. Polyolefin materials are produced from non- renewable resources. In production or post-production, material cannot be recycled save into a lower form. PVC's principal constituent is common salt whilst scrap can be recycled into film.
Polyolefin shrink films are invariably offered as multi-layer complexes. These layers comprise polyethylene and polypropylene in various forms. At the premium end of the shrink film market, irradiation is used and gives the material particularly strong seal and puncture and tear resistance characteristics.
Polyolefin Shrink Films are also formulated to offer low shrink force whilst they have also been extended into food use where both anti fog and barrier grades are available. Further enhancements include printing as well as pre-perforation which offers valuable benefits in production.
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