Liner with a barrier layer

The liner comprises a carrier made of a film layer and/or a barrier layer applied on the film layer, where the barrier layer has a barrier effect against oxygen and water vapor and/or against other noxious gases. The film layer and the barrier layer are made of a plastic foil. The barrier layer has a penetrability of oxygen less than 0.005 g/m 2>/24 h measured at 23[deg] C and 50% of relative humidity, and a penetrability of water less than 0.005 g/m 2>/24 h measured at 37.8[deg] C and 90% of relative humidity. The surface of the barrier layer is equipped with an anti-adhesive coating. The liner comprises a carrier made of a film layer and/or a barrier layer applied on the film layer, where the barrier layer has a barrier effect against oxygen and water vapor and/or against other noxious gases. The film layer and the barrier layer are made of a plastic foil. The barrier layer has a penetrability of oxygen less than 0.005 g/m 2>/24 h measured at 23[deg] C and 50% of relative humidity, and a penetrability of water less than 0.005 g/m 2>/24 h measured at 37.8[deg] C and 90% of relative humidity. The surface of the barrier layer, which is turned to an adhesive mass, is equipped with an anti-adhesive coating based on silicone or fluorine. The barrier layer has a thickness of 5-160 mu m. The surface of the free side of the film layer is equipped with an anti-adhesive coating based on silicone or fluorine. The anti-adhesive coating has a thickness of 2-12 mu m. A metallic part is present between the film layer and the barrier layer and is formed from a metallic layer. The liner has a total thickness of less than 500 mu m and is not transparent and impermeable to ultra-violet light. An independent claim is included for a method for bringing an adhesive mass.