| 摘要 |
Material such as polypropylene, polyester or nylon, with high oxygen barrier properties is prepared by evaporating polyfunctional acrylate monomer with flash evaporators (43, 47, 49) and condensing the acrylate as a monomer film or by roll coating acrylate monomers onto a plastic sheet (38) in a vacuum chamber (36), using reels (37, 41). Acrylate is polymerized by irradiation by ultraviolet or electron beam (44, 48, 51, 53). A layer of metal or oxide oxygen barrier material is vapor deposited (46) over the first layer of cross-linked acrylate. An acrylate layer is applied over the metal layer. Adhesion of the acrylate layer on the plastic sheet is enhanced by reactive plasma treatment (52) of the surface immediately before deposition, the plasma treatment and coating being conducted in vacuum with less than three seconds between them. Condensation efficiency is enhanced by chilling the surface of the substrate on which the acrylate is condensed to temperatures below 0 DEG C. A backing drum (39, 40) and/or rolls (42) may be cooled to less than -15 DEG C. |
