A cling film system includes first and second film piles having different composition. Each film ply includes at least one cling layer and, desirably, one or more additional layers. Each film ply includes an overlapping portion and a second portion. The cling layer of the first film ply engages the cling...http://www.google.es/patents/US6942909?utm_source=gb-gplus-sharePatente US6942909 - Wrapping films with mating cling strips
