First, thermal bonding method. Prepare a flat smooth wooden strip 1.5-2 meters long, 5-6 cm wide, 8-10 cm thick, as a backing plate, nail thin iron screens, and fix it on a long bench to prevent To injure the plastic, use a plane to flatten the side ridges of the slats to a smoother plane. One edge of each of the two films to be bonded is mated to the wood strips, overlapping each other by about 4-5 cm. 3-4 people operate at the same time, and 2 people are responsible for the "pair seam" on both sides of the wood strip. The third person puts a kraft paper 8-10 cm wide and 1.2-1.5 m long at the well-seam membrane. After the old newspaper strips are covered, use the preheated electric irons along the end of the wood strips, and push them to the other end slowly with appropriate pressure. The heat of the iron used, the downward pressure, and the speed of advancement should all be softened by the heat of the two films under the paper and stick together to a certain degree, and then the paper strips will be peeled off and will be sticky. A section of film is pulled toward the other end of the bar and the next section is repeatedly bonded and reciprocated until the film is brought to the desired length.
When the adhesive film is used, the temperature of the iron must be well controlled, the suitable temperature for bonding the polyethylene film is 100-110°C, the polyvinyl chloride is 120-130°C, the temperature is low, the adhesiveness is not firm, and cracks easily occur after the temperature is too high. , easy to melt the film, there will be holes in the seam or thin film.
The pressure used and the moving speed of the electric iron must be matched with the temperature. When the temperature is high, the pressure used is smaller, the moving speed is faster, the pressure used when the temperature is low is large, and the moving speed is slowed down. When there are greasy marks on the pad, it means that the temperature is too high and the plastic has melted. At this time, the paper cannot be removed immediately. It should be cooled for a while. When the paper is not hot, it can be better. Ensure the quality of bonding.
When the old film is to be branded, the film of the joint should be wiped clean, and the newspaper should be adhered to the film with a slight degree of adhesion to a moderate standard, otherwise the joints are easy to crack.
Second, agent sticking method. Perchlorethylene resin plastic adhesive can be used to repair and repair polyvinyl chloride film. Polyethylene film can be repaired with polyurethane adhesive. Sometimes it can also be hot-pressed with a small steel saw blade.
Third, mud glue repair method. During the use of the greenhouse membrane, if there is a small damage such as hanging or wrinkle, a piece of plastic can be cut and the mud water can be stuck on the broken place.
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