| 摘要 |
<p>A sealable and peelable polymer film comprises a block copolymeric substrate and a heat sealable coating and/or skin layer on the substrate. The skin layer may be inherently sealable or be coated with a sealable coating. The film may be cavitated. The core layer may be polypropylene/polyethylene block copolymer and the skin layer may be a polypropylene/polyethylene random copolymer and polypropylene/polybutylene random copolymer blend or a polyethylene/polypropylene/polybutylene random terpolymer. A package, such as a paper ream package, may be formed by wrapping the film around an article to be packaged to obtain at least one region of film overlap and heat sealing the resulting overlapped film sections to each other to provide at least one sealed region of the package, the sealed region being subsequently openable by manually separating the overlapped film regions effectively without substantial tearing of the film at or around the sealed region.</p> |
