Patent ID: 7574886
Filing Date: 2009-08-18
Classification: B21C

Abstract:
1. A method of producing corrugated strip from polymer coated metal sheet material, the method comprising the steps of: (a) driving the polymer coated metal sheet using a pair of pinch rollers; (b) progressively forming box-shaped corrugations in the polymer coated metal sheet as the polymer coated metal sheet is moved in a movement direction through a plurality of tooling stands with rotationally driven upper and lower tooling, where the box-shaped corrugations extend lengthwise along the polymer coated metal sheet and in the movement direction, including multiple tooling stands with spaced apart portions that ride in the box-shaped corrugations and intermediate portions separating the spaced apart portions, wherein the spaced apart portions of each of the multiple tooling stands are slip-clutch driven relative to the intermediate portions of the same tooling stand to limit sliding of the spaced apart portions relative to the polymer coated metal sheet, thereby limiting damage to the polymer coating of the polymer coated metal sheet.