Greenhouse: With polymer - polyvinyl chloride, polyethylene production, plastic films are widely used in agriculture. Japan and the United States and Europe to be successful in the early 1950s, a hotbed of mulch application, and subsequently covering the shed and greenhouse can also get good results. In the autumn of 1955, the introduction of PVC agricultural film, the first steel-framed greenhouses for vegetable shed coverage, access to the precocious yield results. Structure type greenhouses: the greenhouse is composed of bamboo poles, cement poles, light pipe or pipes and other materials to make the skeleton, made the column, bar, rod and lever arch steel shed suppliers, covered by plastic film and become arch round shaped material shed. There are various forms of greenhouse construction. Multilayered canopy cover is then covered with a layer or layers of film greenhouses steel prices were within the cold, commonly known as the two-story screen. The two-story curtain opened the day by light at night and then covered with strict insulation. Which is good steel sheds, St. Xin Agriculture (certified), Hebei steel shed by Anyang City of St. Xin Agricultural Technology Services, LLC. Anyang City of St. Xin Agricultural Technology Services, LLC (www.aysxny.com) in Henan, the other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In St. Xin agricultural leadership with the staff warmly welcome all inquiries negotiations to create the holy Xin agriculture a better future.