Perforated film with liquid retention and gas/vapor venting characteristics for packaging

摘要

A process of forming a perforated packaging film with simultaneous liquid retention and gas/vapor venting characteristics, including the steps of forming a polyolefin film, perforating the film with perforations being either slits having a length of no more than 100 mils or holes having a diameter of no more than about 5 mils, and spacing the perforations from each other so that the total open orifice area is no greater than 20 mils/in².