Features and disadvantages of PVC film
The application of PVA is based on the solution method. Thin film materials are prepared by casting film. However, the solution processing and molding need to undergo dissolution and drying processes. It has disadvantages such as complex process, high cost, and low yield. It is difficult to prepare thick-walled and complex-shaped products. At the same time, it cannot be co-extruded and blown with other materials to prepare a multilayer composite film. Polyvinyl alcohol is non-toxic, tasteless and harmless to the human body, has good affinity with the natural environment, does not accumulate, and does not pollute.
The polyvinyl alcohol high-barrier composite film is a film with extremely high barrier properties formed by coating a modified polyvinyl alcohol water-soluble liquid on the substrate with polyethylene plastic as the base material. Because the polyvinyl alcohol high-barrier composite film has good barrier properties and meets environmental protection requirements, the market prospect of this type of packaging material is very bright, and there is a broad market space in the food industry.