It is the film changing season, and the agricultural film produced by different companies differs greatly in thickness, heat preservation, anti-fogging and dripping properties, and price. How can we choose high-quality agricultural film? The author recommends that vegetable farmers pay special attention to the following six points when buying agricultural film: Film appearance Before purchasing, pay attention to check the appearance quality of batches and whole rolls of film, and check whether there are bubbles, streaks, perforations, ruptures, ribs, wrinkles, etc. on the surface. For example, a good-quality polyvinyl chloride shed film has a light blue appearance, and the entire roll is even, not loose, and has good transparency. When the sun shines through, the light is softly dispersed, while the general agricultural film is whitish, foggy, and transparent. Sunlight feels direct. Film thickness In terms of thermal insulation performance, the greater the thickness of the same material, the stronger the firmness and the higher the thermal insulation performance. Generally speaking, the effective period of use is 1 to 2 years, and the film thickness can be 0.08 to 0.10 mm; the effective period of use is 2 to 3 years, and the film thickness is mostly 0.12 to 0.15 mm. Some multi-span greenhouses use 0.15 mm PO film, and the service life can even reach 5 years. Tension of film A good film has good horizontal and vertical tension. A small piece of film is randomly cut and stretched repeatedly to see if it will break. Generally, good-quality shed films have high tensile strength and are not easy to break. Inferior shed films are relatively brittle and are prone to cracks or even break during the stretching process. In addition, a good greenhouse film still maintains good flexibility in the cold winter, while the general agricultural film becomes hard and will have white marks when it is folded slightly. Film insulation When the shed film with good thermal insulation is stretched, it will turn white when it is pulled apart. If it is repeatedly stretched in the white place, it will be transparent again, indicating high thermal insulation, while the general agricultural film has no such effect. Anti-fogging and dripping properties of greenhouse film The anti-fog and dripping property is an important test index of the greenhouse film, and it has always been the focus of complaints about the greenhouse film. If the greenhouse film purchased by the vegetable grower has poor anti-fogging and dripping properties, especially in winter, when the ventilation time is short, a large number of water droplets will accumulate on the greenhouse film, causing the incident light to be reflected or refracted, reducing the light transmittance of the greenhouse film and affecting the plants Photosynthesis. It is recommended that vegetable growers test the anti-fogging and dripping properties of the greenhouse film before buying. The method is as follows: Method 1: Put hot water of about 50℃ in the cup, cut off a piece of shed film to buckle on the cup, and check whether the inner surface of the film is dew drops or a layer of mist. If it is a dew drop, the dripping effect is poor, which is a poor quality film. Method 2: Spray the shed film with water. If the water droplets are in the form of beads and flow down the film wall, it indicates that the film has good anti-fogging and dripping properties. When the general shed film is sprayed with water, the water becomes flakes. Method 3: Use plastic tape to repeatedly bond the dripping surface of the shed film. If it is a good film, the mist-eliminating drips will not disappear. If it is a defective film, the anti-fog and dripping function will disappear after repeated two or three times. Dust resistance of greenhouse film The shed film with good dust-proof effect is non-sticky and easy to spread. However, the general agricultural film is strong, and the film and the film will stick together, not easy to pull apart, and easy to stick to dust. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone
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