1.     Ageing
Usually we do a hand tear test to determine whether the film has aged. In addition, we can test different places to see whether it is local aging or overall aging. The most common problem is that farmers use sulfur or halogen ( Cl, Br , etc.), which makes the UV stabilizer added to the film lose its effectiveness, thereby accelerating the aging of the film. When the film contacts iron, wood, PVC , etc., it will also cause the film to age faster.
(Note: To prevent premature aging of the film, please minimize the use of chemicals containing sulfur , chlorine, etc.)


2. Poor dripping
Usually we judge the dripping problem from the following aspects:
1 ) Check whether the installation is correct by checking the printed “This side faces the ground” on the film;
2 ) Production and installation time. On the one hand, it often takes a certain amount of time for the drip agent to take effect, especially in the very cold north. On the other hand, because the drip agent is constantly migrating from the inside to the outside, the drip agent on the surface is constantly washed away by water. After a period of time, the concentration of the drip agent is low to a certain level and eventually loses its effect.
3 ) Is the film installation angle appropriate? If the angle is too flat, the mist droplets on the film surface cannot flow down from both sides well, but will directly drip onto the plants.
4 ) Whether the film is installed well, for example, there should be no creases, because the droplets will stay in the creases, which is equivalent to continuously dissolving the drip agent there, and finally causing the area to fail prematurely.
5 ) The temperature difference between the inside and outside of the greenhouse and the humidity inside the greenhouse. When the humidity inside the greenhouse is not enough, the droplets cannot form a water film on the surface of the membrane, causing the droplet agent to precipitate and become powder attached to the surface of the membrane.

3. Films stick together
When the film is at high temperatures, the polymer chains untangle and fuse together, causing the film to stick together.
Different materials have different softening points. For example, the softening point of LDPE is about 95°C, the Vicat softening point of LLDPE is about 100°C , and the softening point of EVA is about 60-75°C . The higher the VA content, the lower the softening point.
In order to avoid this problem, the most important thing is to avoid exposing the rolled sheets to the sun and avoid high temperatures and high pressures.