optically variable paint
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Optically Variable Paint U.S. Patent 5653,792. Aug. 5, 1997 R. W. Phillips et a/., assignors to Flex Products Inc., Santa Rosa, Calif.
reflecting layer having first and second sur- faces and a multilayer thin film comprising at least one dielectric layer.
An optically variable paint for obtainmg a color shift between two predetermined colors comprising a liqurd medium and
optically variable flakes disposed in the liuuid medium. the ooticallv variable flakes
Zinc Phosphate Coating Composition U.S. Patent 5653,790. Aug. 5, 1997 N.A. Fotinos ef al, assignors to PPG industries Inc., Pittsburgh
br’ing comprised of&a thin film structure An aqueous acidic composition for
having an aspect ratio of at least 2 to I forming a zinc phosphate, tungsten con-
resprctivcly for surfaces parallel 10 the taining coating on a metal substrate com-
plants of the layers and surfaces perpen- prising 0.4 to 3.0 g/L of zinc, 4 to 20 g/L
dicular to the planes of the layers, each of phosphate, 0.005 to IO g/L of tungsten, and
the flakes being in the form of an interfer- 0.5 to 20 g/L of an accelerator selected
ence slructure comprising an opaque metal from the group consisting of an oxime.
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hydroxylamine sulfate, and mixtures thereof.
Method for Cleaning and Drying Metal Articles U.S. Pafent 5,653.820. Aug. 5, 1997 M. Higashino, assignor to Minebea Co. Ltd., Japarl
A ntethod of cleaning metal articles compriyinp alkaline washing; rinsing with deoxidized rinsing water; producing dry vapor having no liquid phase from water in
a boiler; removing water by hlowing the dry vapor evenly in a nonoxygen state so as to prevent formation of rust on the sur-
faceof the metal articles. and drying in a heated atmosphere.
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The XFP-6000 paint overspray system IS speclhtally deslgned lor the collecl~on 01 aerospace chromate coating overspray, vlrlually elimlnaiirlq dangerous chromium emlsslons up Ihe slat three-stage system can also be easily adapled 1o older, two-stage paint lmishing hnes When 6OW was lesled wdh a waler reducible epoxy poiyamlde primer, it achteved a 99 993% eillcle only 1.0 WG hnal pressure drop When lested Ior ftacllonal elhclencies, Ihe system’s avetag efliciency was 98 45% on 3 0 5 0 mcron-size IpartIcles (lest results avatiable upon request
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80 METAL FINISHING l APRIL 1998