Storage of EVA film and its shelf life

EVA film (ethylene vinyl acetate) is an important material in the production of laminated glass and solar panels. Proper storage of EVA film is key to maintaining quality, shelf life and ensuring optimal performance during use. In this article, we will take a detailed look at the recommendations for storing both packaged and unopened rolls of EVA film to avoid deterioration of its characteristics.

How to store packaged rolls of EVA film

To ensure a long shelf life of packaged rolls of EVA film, the following rules must be observed:

1. Temperature conditions

   • Packaging rolls should not be placed near equipment that can generate heat. The film is sensitive to high temperatures, so avoid temperatures above 35°C.
   • It is recommended to maintain a stable temperature in the storage room, optimally between 15°C and 25°C.

2. Horizontal placement

   • Rolls should be placed horizontally on a flat surface to avoid deformation of the material.
   • Use special pallets or storage racks to ensure uniform support.

3. Pyramid stacking

   • It is recommended to stack rolls in a pyramid to prevent falls and damage. This also helps save space in the warehouse.

4. UV protection

   • EVA film is sensitive to UV rays, so it should be stored in a dark place or in packaging that protects from light.

Features of storing started rolls of EVA film

After unpacking the EVA film, it is important to ensure its proper storage to avoid loss of properties and color changes.

Moisture protection

• Humidity effects:

  • EVA film quickly absorbs moisture from the environment, which can lead to its yellowing.
  • To avoid this, after use, the roll should be tightly packed in polyethylene film using adhesive tape.

• Optimum storage time:

  • When packaged, a started roll retains its properties for 2-3 months.
  • If the film is not packaged, its shelf life is reduced to 7-20 days depending on the humidity in the room.

Temperature conditions

• Maintain the temperature between 15°C and 25°C. Extremely high or low temperatures may affect the properties of the film.

Recommendations after each use

• If the roll is not used immediately after the work shift, pack it tightly.
• Use vacuum bags for additional protection from moisture and dust.

How does long-term storage affect the quality of EVA film

1. Color change

   • EVA film may turn yellow if overexposed to moisture or light.
   • This phenomenon is especially noticeable after 20 days without proper packaging.

2. Loss of original characteristics

   • Long-term storage without proper instructions can reduce the adhesive properties of the film.
   • This has a direct impact on the quality of the laminated glass.

3. Risk of mechanical damage

   • Without proper horizontal storage of rolls, kinks or cracks may form, affecting the performance of the material.

Additional tips for storing EVA film

1. Regularly check storage conditions

   • Monitor the humidity in the room, maintaining it at 40%–60%.
   • Use hygrometers and thermometers for monitoring conditions.

2. Avoid Contamination

   • Keep a clean environment to avoid dust or other contaminants from getting on the film.

3. Use specialized packaging

   • Use packaging materials with an anti-static coating to prevent dust accumulation.

4. Roll marking

   • Each roll should be marked with the unpacking date to track its expiration date.

Compliance with the above rules for storing EVA film allows you to maintain its quality and extend shelf life. Wrapped rolls require stable storage conditions with temperature and humidity control, while opened rolls require special attention to packaging and protection from external factors. The correct approach to storage ensures high productivity and quality of the final product.