| 摘要 |
PROBLEM TO BE SOLVED: To provide a breathable, heat-sealable packaging film that allows water and secreted air, especially the water, to pass out of a packaged product, but provides a physical barrier to insects, bacteria and air-borne contaminants, especially to provide an optically translucent film.SOLUTION: A breathable, heat-sealable composite film comprises a perforated polymeric substrate layer having first and second surfaces and an unperforated barrier layer disposed on a surface of the substrate layer, in which (i) the thickness of the unperforated barrier layer is no more than about 12 pm; and (ii) the perforated substrate layer has a degree of perforation of from about 0.1 to about 78%. The perforations have an average diameter of between 0.05 and 1.5 mm. A process for the production of the film which is suitable for use in the packaging of freshly cut plants such as flowers, vegetables, fruits and salads, is provided. |
