STERILIZATION WRAP MATERIAL

摘要

A polyolefin film for use as a sterilization wrap material which includes a film with a thickness of from about 0.005 mm to about 0.2 mm and having a plurality of discontinuous thinned regions. The thinned regions constitute at least about 25 % of the surface area of the film. The thickness and area of the thinned regions are adapted to permit the passage of steam and water vapor through the film during steam sterilization. The film is made by a method which involves extruding a molten polyolefin film at a first temperature and passing the molten film through a nip. The nip includes a anvil roll and a pattern roll (100). The anvil roll has a smooth surface and the surface (102) of the pattern roll (100) is maintained at a temperature which is at least about 150 DEG C lower than the first temperature and is selected to prevent sticking of the film to either roll.