| abstract |
An object of the present invention is to providena drawn polypropylene film as a wrapping material thatnhas transparency and mechanical properties sufficientnas a wrapping material yet having permeability ofngases need for maintaining the freshness of thenenclosed goods and in addition that enables control ofnpermeability of gases to a certain proportion ifnneeded even if secondary steps such as perforationnprocessing, etc. is eliminated. n The present invention provides a drawnnpolypropylene film drawn at least in a monoaxialndirection, which comprises a propylene resinncomposition comprising a propylene polymer componentnand a copolymer component containing ethylene andnpropylene, wherein a content of the copolymerncomponent is 7 to 70% by weight based on the weight ofnthe composition, and the film has a thickness [D 1 ] ofn1.0 to 100 µm and has the following characteristics (1)nto (3):n (1) [T H2O ](a permeability of water vapor) = 9 - 50n(unit: g/m 2 · 24 Hr, in accordance with JIS Z-0208), (2) [T O2 ](a permeability of oxygen gas) = 600 - 12,500n(unit: nmol (STP)/m 2 · s · 100 kPa, in accordance with nJIS K-7126A) (3) [T ethylene ](a permeability of ethylene gas) = 600 -n22,500 (unit: nmol (STP)/m 2 · s · 100 kPa, in accordancenwith JIS K-7126A) |