The splicing of greenhouse films is made up of several narrow films, and the bonding area should be increased to improve the bonding strength during splicing. If the joint is too narrow and the bonding area is small, pulling with force can cause cracks.
After using a line to press the film on the greenhouse cover, it should be immediately pressed with a pressure film line. Generally, a pressure film line is pulled every 1-2 sheds, and the tension of the line should be moderate. At the same time, a simple wind barrier is set up on the windward side.
Film damage needs to be repaired. The film is prone to damage during use and storage, and temporary repair methods can be used for damage during use. There are two methods: one is the water replenishment method, which involves wiping the damaged area clean, cutting a slightly larger film without any holes than the damaged area, dipping it in water and sticking it to the hole, draining the air between the two films, and flattening it; The second method is paper patching. For mild damage to agricultural film, dip the paper in water and stick it to the damaged area while it is wet. It can generally be used for about 10 days.
The damaged film after dismantling should be repaired permanently. If a thicker film is damaged, it can be covered with a film of the same texture and connected tightly with fine threads. You can also clean the damaged area, cover the hole with a slightly larger film, cover it with 2-3 layers of newspaper, and gently iron along the interface with an electric iron. The two films will stick together when heated and cooled. This method is called hot patching. In addition, there is a glue patching method. Wash the area around the hole thoroughly, use a brush dipped in special glue to apply, and after 3-5 minutes, take a piece of film with the same texture and stick it on top. After the glue dries, it can be firmly adhered. The hot patching method and adhesive patching method have good film patching effects. The sewing method not only leaks air, but is also easy to pull open. It is best not to use thin films that are not relatively thick.
When not in use, dig a pit to bury the film. During the storage period, it is important to strictly prevent exposure to sunlight, smoke, and fire, otherwise its service life will be greatly shortened. The best storage method for greenhouse film is to dig a pit and bury it. After production is completed, the removed film should be washed clean and dried, rolled up, and wrapped in old film. Choose a place with moderate soil moisture to dig a pit, and then put the wrapped film into the pit for burial. Note that the distance between the upper layer of the film and the ground is at least 30 centimeters. This method can avoid the aging and brittleness of agricultural films stored in the air, and shorten their service life.