The main reason for the cracking of the shelving material on the surface of the shelving material is that the material used for scaffolding is bamboo, iron wire, aluminum wire, etc., which is hard and pointed to break the film. Therefore, the scaffolding material must be made to have a smooth surface, and the tip and the bamboo section should be flattened by clipping. Tie racks should use hemp ropes, string cords and other soft materials.
Patchwork is too narrow film is made of a large number of narrow films spliced, in the splicing to increase the bonding area and improve the bond strength. If the seam is too narrow and the bonding area is small, it will cause a seam when pulled hard.
After pressing the film to cover the film on the large building cover, it shall be immediately pressed with a lamination line. In general, every 1 to 2 scaffolds pull a laminating line, and the elasticity of the line should be moderate. At the same time, a simple windbreak is set up on the windward side. Otherwise, the thin and light film of the greenhouse can easily be blown under the strong winds of the winter and even be blown up by strong winds.
Damage to the film is to repair the film easily damaged during use and preservation. In use, damage can be repaired temporarily. There are three methods. The first is the method of water supplementation. Scrub the damaged area and cut a thin film with no hole that is slightly larger than the broken place. Put the water on the hole and drain the air between the two films. The second is the paper-making method. The agricultural film is slightly damaged. After the paper is dampened, the dampness is attached to the damaged part. Generally, it can be used for about 10 days. The third is the paste method, using white flour to add water to make a paste, and then add the equivalent of 1/3 of the dry weight of red wolfberry, slightly heated to fill the membrane. After the shed is removed, permanent repair must be used. The thicker film is damaged and can be covered with a film of the same texture and connected with a thin line. You can also wash the damaged area, cover the hole with a slightly larger film, and then cover with 2 to 3 layers of newspapers. Use an iron to gently press along the interface. The two films are heated and heated. After cooling, they will stick. Together, this method is called hot melt method. In addition, there is a plastic repair method. Clean the pores around the hole and apply it with a special glue. After 3 to 5 minutes, take a piece of film with the same texture and stick it on it. After the glue is dry, it can be fastened. The heat-replenishing method and the plastic patching method are effective, but the stitching method is not only leaky, but also easy to open, and it is better not to use a thicker film.
When the digging pit buried film is disabled during the collection, it must be strictly prevented from exposure to sunlight, smoke, and fire, otherwise its service life is greatly shortened. Practice has proved that the best storage method for greenhouse films is digging and burying. After the production of greenhouses, the removed membranes should be washed and dried first, stacked or rolled up, wrapped in old membranes, dug a pit in a place where the dryness of the soil is moderate, and then put the wrapped membranes in the pits for burying. Note that the upper layer of the film should be more than 30 cm from the ground. This method can avoid the agricultural film stored in the air due to aging brittle, and shorten the service life.
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