Plating Zinc plate in making process in the, should take measures makes plating zinc layer not by damage; expand Xia material Shi, method to right, size to accurate, bite mouth mosaic Shi bite mouth connection type should meet specification provides, to according to Board thick, and bite mouth Ravel and processing method different, right left out provides of bite mouth allowance and flange turned side allowance; wind tube seams should staggered set, rectangle wind tube of longitudinal closed sewing should set in corner Shang, to increased strength.