Method and apparatus for electric-charge adhering of thin release-layered plastic firlms to thin copper foil substrates and the like and improved products thereby produced
AssigneeMetallized Products, Inc.
InventorsMartin J. Wilheim, Edward J. Alois
Life of this patent
Estimating the term…
Abstract
An improved method of and apparatus for producing novel preferably thin plastic protective or masking film layer products for thin shiny copper foils and the like, as for PCB applications and the like, with an inner releasable film surface coating carrying a permanent electric-charge for adhering to the shiny foil surface, but with the opposite outer surface of the film being maintained uncharged and electrically neutral.
Claims51
A method of protecting a smooth high finish shiny thin conducting copper foil with a protective masking insulating plastic film pre-treated over at least one of its opposite sides with a release surface, that comprises, electrostatically permanently charging said release surface while maintaining the opposite film side uncharged or neutral;
- laminating the film to the foil to charge-adhere the film release surface against the shiny foil;
- and subsequently, after the protection is no longer required, releasably stripping the film from the foil.
A method of protecting a smooth high finish shiny surface substrate, that comprises, electrostatically permanently charging one side only of a protective masking insulation plastic or paper film;
- applying the film upon the shiny substrate surface to charge-adhere the said one side of the film against said shiny substrate surface;
- and subsequently, after the protection is no longer required, stripping the film from the substrate surface.
Apparatus for producing a charge-attaching protective film or mask for a smooth high finish thin conducting copper foil as for PCB use, having, in combination, a plastic film web roll unwinding station;
- an electrostatic web-charging station;
- means for passing the unwinding film web through the web-charging station in a manner such as to charge only one side of the film web;
- a film-web roll rewinding station;
- and means for conveying the one-side charged film web from the web-charging station to the roll rewinding station.
A protected copper foil laminate product comprising a thin copper foil as for PCB use, having opposing shiny and dull surfaces, and laminated on the shiny surface of the foil with an inner permanently electrostatically charge-attached surface of a protective plastic film, the outer surface of which film is uncharged.
A thin plastic film product for protecting or masking the shiny surface of a thin copper foil as for PCB use, the film having an inner permanently electrostatically charged surface and an opposite outer surface that is electrically uncharged.
Dependencies are inferred from the claim text.