Abstract A method of vapor depositing metal on plastic foil which maintains the foil smooth so as to prevent creases and wherein the foil is passed over a cooling drum which is covered with an insulating layer and wherein an electrostatic charge is maintained between the foil and the cooling drum so as to cause attraction between the foil and the cooling drum thus assuring good contact and smooth foil arrangement on the drum as the foil is metalized. Simultaneous testing of weak spots in the foil are tested. The insulating layer on the drum is broken into small areas and the product of its resistance and its thickness is selected so that it does not exceed one-fifth of the product of the resistance and thickness of the foil.
Apparatus for vapor deposition of a metal layer to a plastic foil comprising a metallic cooling drum rotatably supported, an insulating layer covering the cylindrical surface of said cooling drum, means moving said plastic foil with one surface entrained about said insulating layer on said cooling drum, means for applying a metallized layer to the opposed surfacE of said plastic foil at the area of entrainment and voltage means for applying an electrostatic field between said cooling drum and said plastic foil including an electrically conducting roller engageable with the metallized side of the plastic foil.
Claim 2
Dependent Claim
96 words
Apparatus for vapor deposition of a metal layer to a plastic foil comprising a metallic cooling drum rotatably supported, an insulating layer covering the cylindrical surface of said cooling drum, means moving said plastic foil with one surface entrained about said insulating layer on said cooling drum, means for applying a metallized layer to the opposed surfacE of said plastic foil at the area of entrainment and voltage means for applying an electrostatic field between said cooling drum and said plastic foil including an electrically conducting roller engageable with the metallized side of the plastic foil.
Claim 3
Dependent Claim
39 words
Apparatus according to claim 1, wherein the product of the specific resistance and thickness of said insulating layer on said cooling drum is less than one-fifth of the product of the specific resistance and thickness of said plastic foil.
Claim 4
Dependent Claim
26 words
Apparatus according to claim 1 wherein the surface of said cooling drum is formed with strips so that said insulating layer is divided into small areas.