One is the quality of the shed film itself.
After entering the winter, the anti-fogging and dripping properties of the shed film have a great influence on the humidity control in the shed. A good quality shed film can reduce the fogging phenomenon caused by high humidity in the shed, and a good drip property can make the water droplets condensed on the shed film flow down the membrane, avoiding it from dripping directly on the plant surface, causing bacterial invasion dye. In the production of shed film, factors such as raw material formula, production process, quality and use of anti-fogging dripping agent, quality control and product storage will have an impact on the drip property of the shed film, and the quality of the dripping agent itself and the raw material formulation are even more the main factor of influence.

The second is the reason of the shed angle.
The unreasonable angle of the shed surface has an impact on the shed, such as lighting, the pulling of the covering, the resistance to disasters, etc. At the same time, the too small angle of the shed surface also affects the drip effect of the shed film. It is recommended that the ratio of the height of the shed ridge to the width of the shed is 1:2.5-3, this is for the shed surface to have a proper curvature. Once the width of the shed is too large, the crown of the shed surface will be reduced, and the shed surface is relatively flat, which affects the fluidity of the water droplets on the membrane, so that the water droplets do not flow down the membrane but directly drop.

The third is the intimate contact between the shed membrane and the skeleton of the shed body such as steel wire and bamboo poles.
In order to improve the stability of newly built greenhouses, many vegetable farmers deliberately increased the density of steel wires and replaced bamboo poles with steel pipes. After the shed film is replaced, the steel wire spacing of the shed film strain becomes smaller, or the shed film is not tightened. During the process of strong wind or heat insulation being rolled up and down, it will cause frequent friction between the shed film and the shed frame, resulting in The anti-fogging drip agent is reduced or even disappeared, and the shed film drip property becomes worse. During the downward flow of water droplets, if it encounters obstacles such as steel wires, it will also gather more drops to reduce the drip of the shed film.

The fourth is the impact of shelf time.
Premature shed time will cause the shed film drip to deteriorate. If the shed film is replaced too early, the high temperature generated in the shed and the skeleton of the shed surface will accelerate the dissipation of the anti-fogging drip agent added to the shed film, which greatly shortens the anti-fog drip period of the shed film. After entering the winter, the humidity in the shed increases, but the shed film does not have the defogging and dripping properties, and the water droplets on the shed film will increase.

Fifth, excessive use of chemicals containing sulfur and chlorine.
In order to improve the service life and use effect of shed film, some manufacturers often add a variety of additives to make the shed film have good aging resistance, light transmittance and anti-fogging and dripping property. A large amount of chemicals containing sulfur and chlorine are used to easily form acidic substances and adhere to the surface of the shed film. After neutralizing with the alkaline hindered amine light stabilizer, the effect is passivated, thereby reducing the performance of the shed film.

Sixth, the improper use of vegetable farmers has exacerbated the drip of shed film.
When using the grouting film, some users do not put the liquid on the shed but dry it and then put it on the shed, causing the anti-fog droplets to be easily rubbed off by rubbing; or after the shed is not fully ventilated and dried. Closing the shed will cause the drop effect to drop. In addition, some vegetable farmers cover the mulch with the whole shed, so that the evaporated water in the shed always circulates in the space between the shed film and the mulch. As the soil moisture continues to evaporate, the water in this space will be more and more,*** The final drip will get worse.

Seventh, different types of shed cover will also affect the drip of the shed film.
The light and flat shed surface covering will have less influence. On the contrary, it will increase the chance of friction between the shed film and the shed body skeleton, thus affecting the drip of the shed film.