EVOH High Barrier Film
Wenxi Packaging: Your Trustworthy EVOH High Barrier Film Manufacturer!
Zibo Wenxi Packaging Co., Ltd., established in 1998, is a professional manufacturer of color printing and plastic packaging for food, pet food and other industries. Our main products are color printing packaging, functional packaging, in-mold labels, etc., including food packaging bags and color printing composite films. These packages are widely used in food, agrochemicals, cosmetics and health care industries. Currently, we are equipped with an independent technical department that can develop new environment-friendly materials according to your needs.
Rich Product Range
Our packaging models are complete, including high-temperature cooking packaging, low-temperature freezing packaging, functional color printing packaging, multi-sided sealing bags, zipper stand-up bags, aluminum foil cooking bags, EPS packaging boxes, etc.
Well Equipped
The factory has a fully enclosed clean workshop, as well as multi-layer co-extruded barrier film under-blowing water cooling production equipment, as well as automatic stretch packaging machines, packaging bag production facilities and color printing composite workshops and other equipment.
Quality Assurance
Our production environment meets the high standards of GMP 100,000 and has passed ISO9001 series certification, production license and printing license. We also design our own production facilities, including patented co-extruded film cutting units.
Customized Services
Our products are made of different bag structures and film materials, produced in optional printing colors, and provide customized designs such as logos, patterns, number of layers, etc.
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EVOH high barrier composite films are flexible, coextruded films that can protect products from moisture, oxygen, and loss of product fluids. They are made from polyamide and polyethylene, which provide puncture resistance, and contain EVOH (a PE-based aroma barrier named Ethylene-vinyl alcohol copolymer that preserves the taste of the packaged product). It is known for having barrier resistance to gases such as oxygen, nitrogen, and carbon dioxide which makes it particularly suited for packaging food, drugs, cosmetics, and other perishable products. However, when exposed to moisture, EVOH loses its gas barrier properties. For this reason, it is often used in a multilayer co-extruded film structure with materials such as HDPE, PP and PET.
Features of EVOH High Barrier Film
Easy to Use
To make the barrier films easy to cut and tear off, our barrier films are designed with perforated edges that quickly separate the film into smaller sized sheets. It also comes with a plastic holder to hold the roll of barrier film in place.
Quick Replacement
This barrier film adheres firmly to food surfaces, providing a protective barrier that leaves no residue. Its non-stick edges make the separator easy to peel and lift to replace with a new one, making packing quick and easy.
Food Safety
The barrier film is safe for food contact, contains no harmful BPA, and is 100% microwave and freezer safe. This way, you can easily store any leftovers, freeze them, or even heat them in the microwave.
Rich Sizes
Our barrier films are available in different wide sizes, allowing them to package food ranging from a small piece of butter to several kilograms of ribs. They are suitable for home use or restaurants, food factories, and fresh food transportation applications.
Application of High Barrier Packaging Film
There is a growing need for packaging materials that better preserve the contents within. This is due to concerns about the tendency of plastics to enable the exchange of gasses that might damage the quality and safety of packaged goods. Nowadays, high barrier packaging films are used in various ways.
Oxygen Barrier
To enjoy an extended shelf life, some products should have packaging that possesses limited to zero oxygen transmission rates. Oxygen barrier packaging incorporates a specific material layer to keep oxygen out of the pouch, preserving your product's color, taste, or scent.
Moisture Barrier
If you need to protect your products against excessive vapor and moisture, our moisture barrier packaging materials will do the job. Protective layers and materials such as film foil laminations, polyvinylidene chloride, and high-density polyethylene can be custom designed into high-barrier packing pouches to prevent undesired moisture qualities from entering the pouch or bag.
Food Packaging
Inconsistent or unexpectedly shortened shelf life is one of the most prevalent issues food consumables face. By producing a securely sealed barrier system, high-barrier packaging aids in the preservation of tastes and smells. The barrier coating effectively prevents oxygen and water vapor from coming into touch with delicate foods.
Any air or moisture that enters the pouch can significantly impact products like coffee grounds, snacks, and certain dry ingredient food products.
Non-Food Products
Non-food products such as home chemicals and nutraceutical supplements can also benefit from high-barrier packaging. Our specialized materials are tested and verified throughout the high-barrier lamination process to provide protection.
Benefits of EVOH High Barrier Film
EVOH films allow converters to add other barrier materials like moisture control and nylons for strength and abuse resistance, eliminating the need for the previous lamination process entirely. With our EVOH, all a customer really needs to do is print a skin of polyethylene and laminate to our film and be done with it.
Protecting Against the Elements
Whether you’re protecting beef jerky, coffee grounds or 3 tablespoons of sage spice, protecting the enclosed product is understandably important and EVOH film barriers can provide customers with piece of mind that the original lamination process couldn’t always guarantee.
EVOH allows us to tell our customers what our barrier properties are going to be with confidence — whereas if you’re laminating layers of film together, if one of those films doesn’t quite have the necessary properties, then you’re not going to get the numbers that a customer is looking for. Customers want flavor retention and the lamination of various components really didn’t give them that.
Extruding with the Customer in Mind
While the oxygen barrier created by EVOH film is a major selling point, not all customer requests are the same. This has resulted in the need for more variety when extruding this particular film. But that’s all part of being an extension of the customers’ production facilities.
Over the years, our customers have learned that when they have questions, they can come to us for answers. Whether it’s spec sheets, government approvals or meeting federal regulations for food-safe films, we give them the assurance that their film is going to do what it’s been engineered to do.
Expanding the EVOH Horizon
With the demand for EVOH growing, customers are going to find new uses for EVOH. One such instance occurred when some of our customers started using EVOH for lidding purposes. A customer might go out and buy a high-oxygen barrier tray to put their food product in, but then use a polyethylene lid that might only offer moisture control. While it may be a cheaper option, you’re risking the flavor retention of your product. EVOH is an answer to this kind of packaging challenge. It’s the unique uses of EVOH that will continue to fuel its growing demand in the film barrier industry, and we are ready and able to help new and existing customers find the exact solution they need for their oxygen barrier film needs.
Popular high-barrier films are now more accessible, customizable, and affordable for producers in the food industry and beyond. Here are some of the best-performing barrier films available now and what properties they offer.
Ethylene-Vinyl Alcohol (EVOH)
A leader in oxygen barrier properties, EVOH is used to keep food and beverage items fresh, as well as medical products and cosmetics. EVOH works best in a layered configuration between an HDPE outer wall and an adhesive resin such as polyamide on either side.
This setup is found in many plastic bottles and jars, maximizing protection against a full range of gases and humidity while regulating temperatures.
Metallized Polyester (Mylar, VMPET, BOPET, & METPET)
A modern upgrade to aluminum foil, metallized polyester materials give you the best of both worlds in terms of thin thermoplastic films and superior barrier properties..
This combination is achieved by coating a polymer film with a thin layer of metal, giving the material a glossy metallic finish while enhancing oxygen and moisture barrier properties and retaining lightweight flexibility.
Mylar is a popular version of this high-performing film, used in electronics circuits, snack and coffee packages, decorations, and insulation.
Nylon (NY6)
Nylon film (a thin form of polyamide) is tough. It’s resistant to scratches, punctures, and flex-cracks, all of which can negatively impact the look and feel of products on the shelf.
Producers also have access to a wide variety of nylon film types, based on what they need in terms of barrier properties and visual attributes.
PVDC (Polyvinylidene Chloride)
PVDC excels in protecting products from vapor, moisture, and oxygen, and is often combined with other layers for increased effect. On its own, PVDC is still a high-performance barrier film with great tensile strength, ideal for delicate and perishable products with see-through packaging.
Process of EVOH High Barrier Film
EVOH resins can be easily processed on conventional plastic extrusion and other fabrication equipment and do not require special modifications like that for polyvinylidene chloride or polyvinyl chloride. EVOH resins exhibit rheological properties similar to other resins and can be coextruded with many types of polyolefins, nylons, polystyrene, polyvinyl chloride, polyesters, and thermoplastic polyurethanes.
EVOH resins have very poor adhesion to most of the aforementioned polymers, so modified polyolefin adhesive resins, commonly called “tie resins,” are used to bond the EVOH layer to the adjacent layer in coextrusion. Some nylons and thermoplastic polyurethanes will adhere directly to EVOH without the use of tie resin. EVOH resins can be processed on commercially available equipment in the following processes:
●Coextrusion coating for film and paper
●Coextrusion film laminating
●Coinjection stretch blow molding
●Coextrusion blow molding
●Monolayer blown and cast film extrusion
●Monoinjection and coinjection molding of containers, fitments, and other parts
●Multilayer blown and cast film extrusion
●Powder coating
●Profile coextrusion Sheet coextrusion
In addition to primary extrusion processing, EVOH film and sheet can be modified in secondary processing such as co-orientation film (tenter frame), sheet thermoforming, and double or triple bubble blown film. The processes are used to produce formed rigid barrier containers and a range of flexible barrier bags, films, and pouches, and other containers and packaging.
Similar to other extrusion polymers, EVOH resins can be degraded by prolonged exposure to thermal energy, both drying and extrusion processing. Proper extrusion conditions and optimal extrusion equipment design should be used to prevent degradation.
EVOH resins are easily processed on conventional extruders without special modification. Both single stage metering screws and barrier screws are used for EVOH processing, but barrier screws are the most popular type of screw for processing EVOH resin due to their higher output. EVOH has a high affinity to metal, so screws, adapter pipes, feed blocks, and dies for processing EVOH should be chrome or electro-less nickel plated to help prevent the accumulation of degraded polymer on the screw. Screws with mixing heads can be used for extruding EVOH resin, but this is generally not recommended because mixing heads can restrict flow and result in degradation of the EVOH melt. Static mixers are not recommended.
The residence time and temperature in EVOH extrusion system should be minimized to prevent polymer discoloration, gels, fish eyes, and significant changes in melt viscosity. Minimizing residence time can be accomplished by using properly sized EVOH extruders, avoiding low extruder speed, using adapter pipes with minimal length and smaller bore diameters and eliminating dead spots in the extrusion system.
EVOH processing temperatures should be set as low as possible without creating interfacial instability with adjacent layers and without getting unmelts or poor mixing. Also, processing EVOH over 240 deg C (465 deg F) is not recommended. Additionally, extended downtime with EVOH in the extrusion system should be avoided, and EVOH should be thoroughly purged out of the system prior to shut down. The EVOH extruder speed should be set to no less than 10 rpm.
Factors to Consider When Choose High Barrier Film
The type of barrier packaging you choose ultimately depends on the product being packaged. Is it a fresh consumable? Does it have to be stored for extended periods of time? Do you want customers to view the product? Is is sensitive to oxygen? While other factors are still important, the product requirements still remain the key determining factor. Other aspects you should consider while searching for food packaging resources include:
Estimated Product Shelf Life
If your products have a low shelf life, you should go for low or medium-barrier plastic film. This is because such products are usually low-value retail items that are consumed quickly, so your primary focus should be on economic packaging.
For products with a longer shelf life, high-barrier materials are the best option for packaging reducing food loss and waste of other products. They are very stable and will keep your products fresh for a long time.
Sensitivity to Moisture
Some products like nutritional mixes and dry food ingredients are extremely sensitive to moisture and should be packaged in enhanced barrier plastic films. This includes high-density polyethylene and foil laminations that are effective in preventing moisture from getting into the bag.
Sensitivity to Oxygen
Products like chips change their taste and texture when exposed to oxygen and should be packaged in oxygen barrier packaging materials. They prevent oxygen transmissions inside the bag and extend the shelf life of your product.
Physical Capacity
The flexible barrier material used should be strong enough to hold your products. You should conduct a physical test to determine how well the packaging can protect your product against external elements such as light, dust, heat, and air.
Availability
The packaging material used should be easy to restock within short time frames after you place your order. Any delays in sourcing the packaging materials could also impact the production process and, ultimately, your sales. Enough reasons to make sure you have reliable supplier that provide automated packaging solutions.
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Frequently Asked Questions of EVOH High Barrier Film
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