1. Adhesive bonding method. Primarily, polyvinyl chloride resin plastic glue is used for bonding and repairing polyvinyl chloride film, while polyethylene film can be repaired with polyurethane adhesive. Occasionally, a heated small steel saw blade can also be used for scorching and bonding.

2. Slurry Patching Method. During the use of greenhouse film, if minor damages such as scratches or wrinkles occur, simply cut a piece of plastic, apply slurry, and paste it over the damaged area.

3. Heat bonding method. First, prepare a flat and smooth wooden strip as a support board, nail fine iron window screening to it, and secure it to a long bench. To prevent injury to the plastic during bonding, use a plane to smooth the side edges of the wooden strip into a relatively smooth plane. Align one edge of each of the two films to be bonded on the wooden strip, overlapping them by about 4-5 centimeters. With 3-4 people working simultaneously, two people are responsible for "aligning the seams" on either side of the wooden strip, while the third person places a strip of kraft paper or old newspaper, 8-10 centimeters wide and 1.2-1.5 meters long, over the aligned film. After covering it, use a preheated iron, applying appropriate pressure based on experience, and slowly push it along the wooden strip to the other end. The temperature of the iron, the downward pressure, and the speed of pushing should be adjusted so that the two films underneath are slightly softened and bonded together. Then, remove the paper strip, pull the bonded section of the film to the other end of the wooden strip, and repeat the bonding process for the next section, continuing in this manner until the desired length of film is achieved. It is crucial to control the temperature of the iron when bonding the film; the appropriate temperature for polyethylene film is 100-110°C, and for polyvinyl chloride, it is 120-130°C. A lower temperature may result in weak bonding and cracks, while a higher temperature can cause the film to melt, leading to holes or thinning at the seam. The pressure and speed of the iron should be coordinated with the temperature; less pressure and a faster speed are used when the temperature is high, and more pressure and a slower speed when it is low. If oil-like spots appear on the paper strip, it indicates that the temperature is too high and the plastic has melted. In this case, do not immediately remove the paper strip; instead, let it cool for a while until it is no longer hot to the touch, which ensures better bonding quality. When bonding old film, clean the film at the bonding section and use the newspaper to slightly adhere to the film as a standard for appropriate bonding, otherwise, the seam is prone to cracking.