The drip of Handern polyethylene agricultural film in Wuhan
DATE：2020/5/10 8:29:07 / READ： / SOURCE：This station
The drip of Handern polyethylene agricultural film in Wuhan
After our country successfully developed the PVC pipe shed membrane in 1963, due to the obvious economic effects in the farmland application test, it was immediately promoted and applied in various provinces and cities across the country. In 1965, the greenhouse film was promoted nationwide. Through several years of practical application, the effect of plastic shed film on crop thermal insulation and income increase is summarized. It is also found that when the plastic shed film is used in winter and spring, the surface of the shed film will drip, which will cause harm to the crops. In 1965, China began to study the PVC non-drop film. Since the successful development of polyethylene shed film in China in 1976, the development and application of polyethylene drop-free shed film has been carried out on the basis of PVC drop-free shed film. Www.handern.com breathable film equipment, melt-blown non-woven equipment, Plastic building template
Polyethylene is a crystalline plastic, and its surface tension is smaller than that of water (see Table 44), which easily absorbs moisture and dust in the air. In the winter and spring seasons, when the temperature difference between the greenhouse (greenhouse) and the outdoor open air environment is large, in the greenhouse (greenhouse) covered by the ordinary greenhouse film, a large amount of water droplets will be observed on the surface of the greenhouse film, and the Water dripping, this phenomenon of intensive dripping and water droplets, is very unfavorable for crop cultivation. www.handern.com breathable membrane equipment, melt-blown non-woven equipment, plastic building templates
China's polyethylene non-drop film has been industrialized in the 1980s and is gradually being accepted by agricultural users. With the improvement of China's plastic film forming technology and the development of the additive industry, the drip-proof technology of plastic shed films has matured. In the 1990s, successively developed a combination of shed film drip technology and anti-aging, thermal insulation, and improved sun light quality technologies; shed film forming technology developed from single-layer extrusion blown film to double-layer coextruded composite blown film And three-layer co-extruded composite blown film. The combination of these technologies has expanded the agricultural film products with dripping function from single-layer drip-free film to double-layer co-extruded drip-free film, three-layer co-extruded drip-free film, and two-layer co-extruded multi-functional film. , Three-layer co-extruded multi-functional shed film and drip-free film. The initial effect and persistence technology of the shed film drip function have approached or reached the international advanced level. www.handern.com breathable membrane equipment, melt-blown non-woven equipment, plastic building templates
For the convenience of description, this section mainly takes the polyethylene drip-shed film with single drip function as an example. Polyethylene non-dropper shed film is divided into tube shed film and greenhouse film. Polyethylene non-dropper shed film is mainly applied to the tube in the greenhouse (greenhouse) covered by multiple shed films. At present, in order to improve the heat preservation effect in winter, many greenhouses for cultivating vegetables and fruits and vegetables build a second or third tube shed (the specifications are successively reduced). They do not have high requirements on the aging resistance of the shed film, and often use a single function Without dropper shed film. www.handern.com breathable membrane equipment, melt-blown non-woven equipment, plastic building templates
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