Monoaxially oriented film made from plastic material for the manufacture of a heat-shrinkable rupturable plastic sleeve and sleeve manufactured from said film

摘要

The film has a local region of extra thickness extending along a line of weakness to border the line of weakness. The line of weakness and an adjacent local region of extra thickness are provided together to define a tear line (10). The local region of extra thickness is constituted by applying liquid or semi-liquid material i.e. polymer varnish, to the film with a specific quantity based on expected shrinkage ratio in a portion of the film while a sleeve is heat-shrunk onto an article. The tear line extends around a closed outline. An independent claim is also included for an article covered by a heat-shrink sleeve.