About Ethylene Vinyl Alcohol
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Technical profile of Ethylene Vinyl Alcohol, a high-purity raw chemical material supplied by Triveni Chemicals for industrial manufacturing and laboratory synthesis.
Ethylene Vinyl Alcohol (EVOH) is a high-performance copolymer made from ethylene and vinyl alcohol units. It does not have a single fixed molecular formula, as it is a statistical copolymer, but its structure is based on repeating CHCH and CHCH(OH) units. It appears as a white to off-white thermoplastic resin. It is insoluble in water and most organic solvents, but it is sensitive to moisture absorption. It is stable under normal processing conditions.
In terms of uses and applications, Ethylene Vinyl Alcohol is widely used in the packaging industry due to its excellent gas barrier properties, especially against oxygen. It is commonly used in food packaging films, multilayer bottles, pouches, and vacuum packaging to extend shelf life. In the pharmaceutical and medical industries, it is used for sterile packaging and medical device barriers. It is also applied in automotive fuel tanks and industrial containers to prevent fuel and chemical permeation. Additionally, EVOH is used in multilayer plastic systems where high barrier performance is required.
Exceptional Barrier Solutions for PackagingEVOH excels at preventing oxygen and aroma transfer, making it indispensable for packaging sensitive food products. Its low oxygen permeability ensures long shelf life and product freshness. Whether you need a blown or cast film, or require a complex multi-layer structure via co-extrusion, EVOH's adaptability and superior barrier performance give it a decisive edge in the packaging sector.
Versatility in Processing and FormAvailable in pellet, granule, or film formats, EVOH is compatible with blown and cast film processes, injection molding, and extrusion coating. Its customizable thickness (10-120 microns) and width provide manufacturers with broad flexibility for various packaging and coating applications, while maintaining a smooth, transparent surface finish in film format.
FAQ's of Ethylene Vinyl Alcohol:
Q: How is Ethylene Vinyl Alcohol (EVOH) typically processed in industrial applications?
A: EVOH is processed using blown film, cast film, co-extrusion, injection molding, and extrusion coating methods. The choice of process depends on the desired end product, such as barrier packaging films, laminates, or coatings. Its melt flow index of 2-6 g/10min allows efficient handling across these techniques.
Q: What are the primary benefits of using EVOH in packaging applications?
A: EVOH provides an outstanding barrier to oxygen and aromas, which helps extend the shelf life of packaged foods. Its transparency, chemical resistance, and flexibility make it suitable for high-performance packaging and laminates, ensuring both product protection and aesthetic appeal.
Q: When should EVOH be stored and what conditions are recommended?
A: EVOH should be stored in a cool, dry environment below 35C, and exposure to moisture must be avoided due to its hydrophilic nature. Proper storage conditions help preserve its properties and ensure a shelf life of up to 12 months when kept unopened.
Q: Where can EVOH be utilized apart from food packaging?
A: Besides food packaging, EVOH is used in gas barrier coatings, extrusion coatings, and other industrial laminates that require superior oxygen and aroma resistance. Its applications span the pharmaceutical, cosmetic, and specialty packaging sectors where product integrity is crucial.
Q: What factors should be considered during the usage of EVOH in manufacturing?
A: Key considerations include the specific grade (ethylene content), processing method compatibility, moisture sensitivity, and required film or sheet dimensions. Since EVOH absorbs water, it is important to control humidity during storage and handling to maintain its barrier properties.
Q: How does EVOH contribute to the overall performance of multilayer packaging films?
A: As a core layer in multilayer packaging films, EVOH delivers exceptional barrier functions without sacrificing transparency or mechanical strength. Its inclusion ensures longer shelf life and better product protection, reducing spoilage and waste.