EVOH (ethylene-vinyl alcohol) barrier film is a high-performance packaging material widely used in food, pharmaceutical, and other industries due to its excellent oxygen barrier properties, transparency, and mechanical strength. As a supplier of EVOH barrier film, I understand the importance of proper storage to prevent damage and ensure the film maintains its quality and performance. In this blog post, I will share some key guidelines on how to store EVOH barrier film effectively. EVOH Barrier Film
Understanding the Characteristics of EVOH Barrier Film
Before delving into storage methods, it is crucial to understand the unique characteristics of EVOH barrier film that make it susceptible to certain types of damage. EVOH is a hydrophilic polymer, which means it has a strong affinity for water. When exposed to high humidity or moisture, EVOH can absorb water molecules, leading to a decrease in its oxygen barrier performance. Additionally, EVOH is sensitive to temperature and UV light, which can cause degradation and affect its mechanical properties.
Storage Environment Conditions
Temperature
The ideal storage temperature for EVOH barrier film is between 10°C and 30°C (50°F and 86°F). Extreme temperatures can have a negative impact on the film’s properties. High temperatures can cause the film to become soft and sticky, making it difficult to handle and increasing the risk of blocking (the adhesion of adjacent layers of film). On the other hand, low temperatures can make the film brittle and prone to cracking.
To maintain a stable temperature, it is recommended to store the film in a climate-controlled warehouse or storage area. Avoid storing the film near heat sources such as radiators, heaters, or direct sunlight, as this can cause localized overheating and damage to the film.
Humidity
Controlling humidity is crucial when storing EVOH barrier film. The relative humidity (RH) in the storage area should be maintained between 30% and 60%. High humidity can cause the film to absorb moisture, leading to a decrease in its oxygen barrier performance and potentially causing the film to become tacky. Low humidity, on the other hand, can cause the film to become dry and brittle.
To control humidity, use dehumidifiers or humidifiers as needed. It is also advisable to monitor the humidity levels regularly using a hygrometer to ensure they remain within the recommended range. Additionally, storing the film in sealed containers or packaging with moisture barriers can help protect it from moisture ingress.
Light
EVOH barrier film is sensitive to UV light, which can cause degradation and discoloration. Prolonged exposure to sunlight or other sources of UV radiation can lead to a decrease in the film’s mechanical strength and barrier properties. Therefore, it is important to store the film in a dark or low-light environment.
If possible, store the film in opaque containers or wrap it in light-blocking materials to protect it from UV light. Avoid storing the film near windows or other areas where it will be exposed to direct sunlight for extended periods.
Storage Packaging and Handling
Packaging
Proper packaging is essential for protecting EVOH barrier film during storage. The film should be packaged in a way that prevents moisture, dust, and other contaminants from reaching the surface of the film. Common packaging materials for EVOH barrier film include polyethylene (PE) bags, aluminum foil pouches, and cardboard boxes.
When packaging the film, ensure that it is clean and dry. Remove any dust or debris from the surface of the film before packaging to prevent scratching or damage. Seal the packaging tightly to prevent moisture ingress. If using a PE bag, consider adding a desiccant packet to absorb any residual moisture.
Handling
Careful handling of EVOH barrier film is also important to prevent damage. When moving or transporting the film, use appropriate equipment such as forklifts or pallet jacks to avoid dropping or crushing the packages. Avoid dragging the film across rough surfaces, as this can cause scratches and damage to the film.
When unloading the film from the packaging, handle it gently to prevent wrinkling or tearing. If the film is rolled, support the roll from both ends to prevent it from collapsing or bending. Avoid touching the surface of the film with bare hands, as the oils and moisture on your hands can transfer to the film and affect its performance.
Stacking and Storage Arrangement
Stacking
When stacking EVOH barrier film packages, it is important to do so carefully to prevent damage. Avoid stacking the packages too high, as this can cause the bottom packages to become compressed and deformed. The maximum stacking height will depend on the size and weight of the packages, as well as the strength of the storage shelves or pallets.
When stacking the packages, ensure that they are evenly distributed and properly aligned. Use spacers or dunnage between the packages to prevent them from rubbing against each other and causing damage. Avoid stacking the packages on top of sharp objects or rough surfaces, as this can cause punctures or tears in the film.
Storage Arrangement
The storage arrangement of EVOH barrier film should be organized to facilitate easy access and inventory management. Store the film in a way that allows you to easily identify the different types and thicknesses of film. Use labels or markings on the packages to indicate the product name,规格, and expiration date.
If possible, store the film in a first-in, first-out (FIFO) manner to ensure that the oldest stock is used first. This can help prevent the film from becoming obsolete or expired. Additionally, keep the storage area clean and free of clutter to reduce the risk of damage to the film.
Regular Inspections and Monitoring
Regular inspections and monitoring of the stored EVOH barrier film are essential to detect any signs of damage or degradation early. Inspect the film packages periodically for signs of moisture, dust, or other contaminants. Check the film for any signs of wrinkling, tearing, or discoloration.
Monitor the temperature and humidity levels in the storage area regularly using a thermometer and hygrometer. Keep a record of the temperature and humidity readings to track any changes over time. If the temperature or humidity levels deviate from the recommended range, take appropriate measures to adjust them.
Conclusion
Proper storage of EVOH barrier film is crucial to prevent damage and ensure its quality and performance. By controlling the storage environment conditions, using proper packaging and handling techniques, and conducting regular inspections and monitoring, you can minimize the risk of damage to the film and extend its shelf life.
Thermoforming Film As a supplier of EVOH barrier film, I am committed to providing high-quality products and professional advice on storage and handling. If you have any questions or need further information on how to store EVOH barrier film, please feel free to contact me for a purchasing consultation. I look forward to working with you and meeting your packaging needs.
References
- "Barrier Polymers and Structures" by S. Fakirov
- "Packaging Materials: Properties and Selection" by R. A. Paine and R. A. Paine
- Technical literature provided by EVOH resin manufacturers.
Wenzhou Fuya New Material Technology Co., Ltd.
With abundant experience, we are one of the most reliable evoh barrier film manufacturers and suppliers in China. Welcome to wholesale advanced evoh barrier film made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
Address: No. 588, Nengke Industrial Park, Shidai Avenue, Longgang City, Wenzhou City, Zhejiang Province
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