In recent years, people  pay high attention on food and drug safety issues, the community have great concern on the food safety issue of human health. EVOH ethylene-vinyl alcohol copolymer with its high barrier properties, making EVOH as the best choice of environmentally friendly, safe packaging materials.

The world's production EVOH ethylene - vinyl alcohol copolymer resin raw materials manufacturers have Japan's Kuraray, synthetic chemistry, the United States EV Belgium SOLVAY and so on. EVOH ethylene-vinyl alcohol copolymer is made of ethAL, ylene-vinyl acetate copolymer through soap 60-80% vinyl alcohol, PVA is a modified polyvinyl alcohol, the production process and PVA similar, EVOH and PA polyamide, PVDC poly Vinyl chloride and known as the three high barrier materials, EVOH packaging film has high performance, low cost, low pollution and other advantages, is the fastest growing, most widely used film.

EVOH resin is highly resistant to gas and water vapor, EVOH is the alcoholysis product of the ethylene-vinyl acetate copolymer saponification reaction or partial saponification reaction, the high degree of crystal, the hydroxyl groups in the molecule and the hydrogen bonds between molecules are strong Bonding, strong intermolecular cohesion, high degree of molecular chain accumulation, the hydroxyl group in the molecule is polar, oxygen is non-polar, due to similar compatibility principle, oxygen and other gases can not be through. Room temperature, humidity of 65% RH, EVOH oxygen permeability coefficient is other ordinary plastic PP polypropylene and LDPE low density polyethylene ten thousand times. EVOH and oil and other non-polar oils and organic solvents will not produce such as hydrogen cyanide, dioxins and other toxic and hazardous substances, the production process will not cause any pollution to the environment.

EVOH is used in the food industry aseptic packaging, hot and steamed bags, packaged dairy products, meat, canned and condiments. EVOH plastic film can basically replace the glass and metal containers, a number of domestic aquatic products export seafood on the use of PE / EVOH / PA co-extruded film vacuum packaging.

EVOH high barrier film used in tomato products to solve the tomato sauce products, the problem of high oxygen permeability, shelf life extended to 18-24 months.

EVOH used in fermented kimchi packaging, packaging materials, transparency, gloss and other packaging effect is better, the hardness of the kimchi and color preservation of the results are more than the advantages of other ordinary packaging materials.

EVOH in the liquid milk packaging market, is bound to replace the vast majority of PE black and white milk film, as consumers of liquid milk products shelf life, taste and nutrition and other needs to enhance, EVOH multi-layer co-extruded milk packaging applications more and more The wider, the packaging film can be an excellent way to maintain the taste and nutrition of pure liquid milk, Billy Le pill packaging cost is cheaper, the future gradually replace the other flexible packaging materials.

EVOH used in beer packaging better, EVOH co-extruded film with traditional glass bottles can not achieve the use of the effect, in 120 days, less than 15% loss of carbon dioxide, oxygen permeability of less than one millionth, can withstand the Palestinian Sterilization temperature of 77.8 degrees Celsius for 15 minutes, breaking the traditional bottle of beer bottles in the form.

EVOH film has been applied to the packaging of fruit soft cans, packaging in aesthetically pleasing, transparent, consumers directly see the contents of which, flexible packaging form, greatly enhancing the product market competitiveness. The yellow tea cans are packaged in EVOH coextruded bags, the initial temperature of the flesh is controlled at 60-65 degrees Celsius, the sugar temperature is above 80 degrees Celsius, and the sealing strength is 0.025Mpa-0.08Mpa.

EVOH film for meat products are flat bag packaging, stretch packaging, shrink packaging and MAP packaging atmosphere packaging. Flat bag packaging is the original film sealed by the three sides of the bag, the contents of the charge into the nitrogen or vacuum after sealing, this package is generally used EVOH and polyolefin multi-layer co-extruded film, a good oxygen , Water blocking and fragrant function. Stretch packaging is divided into cover film and base film, cover film EVOH and polyolefin multi-layer co-extruded film, without stretching. The base film is mostly EVOH, nylon and polyolefin casting co-extruded high barrier film, into the packaging and then vacuum, and then stretch molding, packaging close to the contents of the consumer can visually see the contents. Shrink packaging for the use of fresh meat, the use of EVOH and polyolefin and nylon co-extruded into a multi-layer barrier film, 90% of the cold meat in developed countries using barrier packaging to extend the packaging freshness, color and taste. MAP packaging consists of multi-layer barrier tray and high barrier film composition, which filled with gas nitrogen, carbon dioxide and oxygen or other mixed gas, slow food oxidation, inhibition of microbial and fungal reproduction, to maintain myoglobin bright red color, The effect is better, mainly for fresh meat and processed meat products.

PE / PA / EVOH / PA / PE co-extruded film packaging sausage preservation of the best, EVOH film superior performance than glass bottles, tin cans and general plastic composite bottle packaging materials. Glass packaging is fragile, transport risk, gross weight, should be affected by light and air color and composition changes. Tinplate packaging costs are too high, easy to transport deformation, the appearance of opaque, poor visibility, affecting the packaging beautiful. General plastic composite packaging of the poor sealing, high oxygen permeability, susceptible to oxygen, carbon dioxide, toxic and harmful products, but also easy to leak. EVOH high barrier film low cost, visibility and sealing strong, easy to transport, to ensure food quality and safety.

In order to meet the new packaging regulations and new standards, to break the green trade barriers, consolidate and expand the export market, China's food processing enterprises must update the packaging concept, strengthen environmental awareness, vigorously develop green packaging. EVOH high barrier multi-layer co-extruded cast film material non-toxic, non-polluting, low energy consumption, low cost, easy to handle, recyclable, will be in the market to be more widely used.