Openable roof film greenhouse is a new type double layer greenhouse, it is combined the advantages of general greenhouse, shading house, net house, and use folding flexible covering material prevent rain and wind. Companied with shading system, the greenh
PVC sheet is a kind of packing materials manufactured by calendering machines, it is characterized by high transparency, good surface luster, few crystal points, small water marks, strong impact resistance, and easy to form, it offers a potent chemical re