After the polyester line is tightened, it is looser than the steel wire rope. In order to avoid breaking due to being too tight, the rope can be lifted up to a height of 1.2 meters to 1.5 meters in the middle, and it can also avoid tripping pedestrians. Each cement column must be padded with bamboo strips or wooden strips to prevent wear. After the polyester line is installed, it is placed in the doorway. The back of the polyester line is on the same parallel plane as the doorway. Use wooden wedges to fix it downward from the left and right upper parts of the doorway. Use a plumb bob to check the verticality of the polyester line. The verticality deviation is required to be less than 1mm, and the error of the two diagonals is less than 3mm. 

Use a level to check the horizontality of the horizontal sleeve plate, so that the horizontality size is less than 1mm. It is a commonly used auxiliary component in greenhouse planting industry. It has the characteristics of high strength, not easy to break, smooth surface, acid and alkali resistance, UV radiation resistance, and weather aging resistance. It is mainly used to support the greenhouse film to prevent the greenhouse film from being damaged by strong winds and extend the service life of the greenhouse film.