How to choose a greenhouse film for multi-span film greenhouses is one of the important issues that farmers in the off-season greenhouse area are concerned about. Song Haidi, a greenhouse film expert, summarizes the following four points based on Internet knowledge, for your reference:
①Cold resistance and heat preservation performance: Choose greenhouse film, and remember to choose low-priced, promotional items. The price of pursuing low-cost greenhouse films is to replace them with new vegetable greenhouse films every year. With the addition of manpower and material resources, the cost is not low, and the total cost of comprehensive greenhouse films is not much cheaper. Therefore, it is best to choose a shed film that is durable, high-quality, high-efficiency, thickness and tensile strength. Covering such a greenhouse film, the temperature in the greenhouse in the deep winter season can be 2 ℃ ~ 3 ℃ higher than covering the conventional greenhouse film.
②Tear strength: tear strength refers to the transverse and longitudinal tensile strength and toughness of the greenhouse film. The shed film with high tear resistance will not be torn by heavy snow and strong wind in winter and spring or the tear level will be light.
③Transmittance performance: In winter and spring, the wind and dust are bigger, and there are many haze weather and the air humidity is high, so the shed film will be stained with a layer of dust. If it is a shed film with good light transmittance, the surface should be lubricated and dust-free, or it will be very clean after washing with rain or snow water. The light transmittance directly affects the light intensity and temperature conditions of the shed.
④Droplet atomization performance: Greenhouse film is divided into drip film and non-drip film. The high-quality shed film has a good atomization level, and no droplets are formed in the shed. When the humidity is high, the water vapor will flow down into the air along with the shed film, and the fog elimination function is excellent. At the same time, pay attention to the fact that a good greenhouse film is divided into the front and the back. Do not buckle the anti-fogging layer to the outside.
