Propulsion system for contoured film and method of use

摘要

Film treatment surface provided with a propulsion system for circularly contoured film (5) along a circular path are disclosed. The essential propulsion and steering system is represented by two adjustable disks (2, 3), one being equipped with a propulsion wheel and a steering mechanism whereas the second disk embodies an idler wheel and a steering mechanism. The treatment surface was found to be beneficially suitable for the manufacture of cut shaped blanks made from shaped films of plasticized polyvinyl butyral. The blanks can be used in automobile windshields.