How many kinds of plastic film specifications are there in the greenhouse?
PVC and PVC film, polyethylene plastic film and polyethylene film, is currently the largest amount of agricultural production in two kinds of plastic film. The PVC film, because of good comprehensive performance, is China's agricultural production on the popularization and application of the longest time, the maximum number of a polyethylene film is applied in recent years. The varieties, because its superior performance, dosage is increasing greatly,
Colored plastic film colored plastic film is a kind of plastic film with various colors respectively, can also be regarded as a change of light quality plastic filter, it is opaque, can also be a transparent transparent transparent colored film. The rate of around 80%, mainly in red, orange, yellow, green, blue purple and other colors, color film is mainly covered with black opaque film.The application of colored plastic film in agricultural production in China is not long, but from the result of the experiment, compared with the colorless plastic film, with the increase of crop yield, crop quality improvement, reduce plant diseases and insect pests. For example, purple film production, delayed progress bolting, extend the season effect on spinach? Rice seedling cultivation with strong blue film with a colorless film more than cultivating strong short plant, in English, a valley is also heavier in tobacco after planting, covered with black film, can inhibit the growth of weeds, the seedlings of a good marriage, and so on.
Cold water directly on the seedlings, but also easily lead to rot, these conditions for the growth of crops that are unfavorable. In order to solve this problem, the film factory added one or several surfactants in film formulation, the surface affinity between water and the film is greatly reduced, or eliminated. That can make the greenhouse water vapor formation of water droplets, not attached to the film, but the film along the wall flow to the ground, in order to maintain the transparency of the original film. The plastic film surface active agent called drop film. According to the test, the use of plastic film awning film, than the use of general film greenhouse can improve the temperature of 2 - 4 degrees of UV transmittance of one percent to five with no progress. The film can make the seedling seedling drop, fast growth, good quality, high survival rate, is not easy to rot.
In order to adapt to the various aspects of agricultural production, agricultural plastic film has a variety of different varieties and specifications. According to the use of plastic raw materials, divided into PVC plastic film and polyethylene plastic film;. According to a method of manufacturing a plastic film, divided into pressure Ting film, blown film; according to some special properties of plastic film there were no film, seedling, drop film, film, thin film, colored cover wide film, packaging film etc. according to the different width and thickness of the plastic film, there are a variety of different specifications.
