| abstract |
A previously coated raw material used in the manufacture of stretch iron boxes and a method of forming such boxes are described in the present invention. Initially, a layer of lubricant is applied to the material on at least one surface of the metal base, the lubricant consisting essentially of a coarse acid ester of a mono or polyhydric alcohol and the distribution of which is less than 0.5 mg / cm 2 (3 mg / inch2). The method consists in applying the layer of lubricant to a base metal such as aluminum, black iron or tinplate, cutting a disc of the base metal and transforming the disc into a box in stretched iron without applying again. lubricant to machine tools. In one version of the invention, a black iron base is coated on one surface with a polymerizable coating which is partially polymerized and a layer of lubricant is applied to the other surface. |