A slit film and method of making same, the slits forming apertures defined by a plurality of axially oriented spaced apart ribbons, the film is pre-slit to define a plurality of substantially parallel interconnected ribbons and stretched axially of said ribbons to orient the ribbons and neck same down...http://www.google.com/patents/US3985599?utm_source=gb-gplus-sharePatent US3985599 - Slit film
