Patent ID: 6177141
Filing Date: 2001-01-23
Classification: B05D

Abstract:
A method for coating a liquid composition from an applicator to a first surface of a moving plastic web having opposite first and second surfaces, the web being conveyed along a path through an apparatus for coating against a backing roller at a coating point, comprising the steps of:a) wrapping said web about a portion said second surface thereof in a partial wrap around said backing roller of diameter equal to or greater than 10 cm, said backing roller being provided with a conductive, relieved surface, said relieved surface having a pattern that provides venting of entrained air, said pattern having a geometry and depth such that the electrostatic force at said coating point does not vary by more than a factor of about ten, said pattern covering at least 30% or more of the width of the web;b) providing an electrostatic field at said coating point; andc) applying the liquid composition to the first surface at the coating point while maintaining a web speed greater than or equal to 75 meters/minute.