Sheet material with improved cut resistance

In a thin film form composite material comprising a base liner film form material, a release layer on at least one surface of said base liner, a pressure sensitive adhesive layer disposed on said release layer, and a peelable face layer film form material disposed on said pressure sensitive adhesive, such that said adhesive layer adheres more strongly to said face layer than to said release layer on said base liner, said face layer being releasable adhered to said release layer on said base liner by means of said adhesive;

• the improvement, whereby allowing said composite material to be subjected to a die cutting or perforating operation whereby said face layer and adhesive are cut through so as to make such peelable from said composite, but said base liner is not substantially cut through to an extent such that, if said cut face layer is peeled from said release layer, said base liner retains its integrity, which comprises:
• the surface of said base liner adjacent to said release layer being modified to provide a thin and tough skin of polymeric material, comprising up to about 5% in thickness of said base liner, which is more cut resistant than is the remainder of said base liner material to an extent sufficient to maintain the integrity thereof after die cutting of said face layer.