EVOH has always been the most widely used high barrier material. In addition to the non-stretched film types of this material, there are also biaxially stretched, aluminum vapor-deposited, adhesive-coated, etc., and the biaxially stretched type is also heat-resistant for aseptic packaging products. The barrier performance of EVOH depends on the ethylene content. Generally speaking, when the ethylene content increases, the gas barrier properties decrease, but it is easy to process.
The salient feature of EVOH is that it has excellent gas barrier properties and excellent processability. In addition, it has excellent transparency, gloss, mechanical strength, elasticity, abrasion resistance, cold resistance and surface strength.
In the packaging field, EVOH is made into a composite film intermediate barrier layer, which is used in all rigid and flexible packaging; in the food industry, it is used for aseptic packaging, hot cans and retort bags, packaging dairy products, meat, canned juice and Seasoning; in non-food, it is used for packaging solvents, pesticide chemicals, air-conditioning structural parts, gasoline drum linings, electronic components, etc.
In terms of food packaging, EVOH plastic containers can completely replace glass and metal containers. Many domestic aquatic products export seafood using PE/EVOH/PA/RVOH/PE five-layer co-extruded film vacuum packaging. While accelerating the research of EVOH composite film, foreign countries are also studying the stretch orientation of EVOH. The gas barrier performance of the new EVOH film is 3 times that of the existing high-performance non-stretched EVOH film.
In addition, EVOH can also be used as a barrier material to be coated on other synthetic resin packaging materials to enhance barrier performance.
A brief summary of the advantages of EVOH:
1. It can provide high barrier performance in low humidity environment
2. Good barrier effect on chemicals, including most oils, acids and solvent pesticides.
3. High transparency: to ensure the ease of operation
4. The smell is fragrant and feels good
5. EVOH can be co-extruded with a variety of polymers