Greenhouse plastic film maintenance: greenhouses composition with bamboo poles, cement poles, light pipe or pipes and other materials to build the frame, made of columns, rod, bar and bar Anyang steel arch greenhouses, covered by plastic film and become arch round feed shed. Film cold or exposure, will promote aging pipe in the summer by sun exposure, the temperature can rise to 60-70 ℃, thus speeding up the aging broken film. Shed the history and function: With polymer - polyvinyl chloride, polyethylene production, plastic films are widely used in agriculture. Greenhouse vegetable production of special equipment was originally plated steel pipe greenhouse frame, along with the development of greenhouse production applications become increasingly widespread. Resistant to natural disasters, cold insulation, drought, floods, early planting pipe greenhouses, delayed planting, extend the growing season of crops, to puberty, late, increasing and stabilizing purposes, by the producers welcome.