Patent ID: 8721814

Claim:
A method for reinforcing cardboard packaging and simultaneously providing a tear strip for said cardboard packaging, said method comprising applying a strip of an adhesive tape to said cardboard packaging at a suitable site of the packaging where the strip can simultaneously function as a tear strip and also provide reinforcement, wherein said strip of an adhesive comprises a carrier material, and the carrier material comprises a polyolefin film oriented monoaxially in the lengthwise direction of the strip, the film comprising a mixture of (a) an olefinic polymer selected from the group consisting of propylene homopolymers and copolymers, (b) 5-30% by weight of the mixture of a polar non-olefinic polymer selected from the group consisting of polybutylene terephthalate and polyoxymethylene and (c) 0.2-10% by weight of the mixture of a polar-modified polyolefin selected from the group consisting of ethylene vinyl acetate copolymers, ethylene vinyl alcohol copolymers and polypropylene grafted with maleic anhydride.