| abstract |
A biodegradable high-barrier vacuum evaporation film substrate and a preparation method thereof. The film is composed of a high-barrier coating layer and a biaxially oriented polylactic acid film (BOPLA) film substrate layer in sequence from top to bottom. The substrate layer is composed of an upper surface layer, a core layer, and a lower surface layer; the preparation steps are divided into two steps. First, a polylactic acid film (BOPLA) substrate that meets the coating requirements is prepared by a flat drawing method, and then an online coating process is used. Or off-line coating process to form a high barrier coating on the surface of the film substrate. For the aluminum-coated film and aluminum-coated film produced by using the high-barrier vapor deposition film substrate prepared by the invention, the optimal oxygen transmission rate can be less than 0.02 cc/m 2 .24h, and the optimal water vapor transmission rate can be The high - barrier vapor deposition film substrate not only has excellent barrier effect, but also is biodegradable, which can effectively solve the environmental problems caused by waste packaging film, and its industrial utilization High value. |