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Each bar will give a "theoretical wet film thickness" or, in other words, the thickness of the coating that should remain on the drawdown card after application. Even with high manufacturing tolerances, the actual wet film thickness can vary from 50% to 90% of the gap. There are multiple types of bar applicators, their forms and uses are shown ...
Wet film gauge for conformal coating thickness measurement. Wet film measurements are for conformal coatings where the dry film thickness can only be measured destructively or through the over-application of conformal coating. The wet film gauges are applied to the wet conformal coating; the teeth indicate the coating thickness.
Slot-die coating is a non-contact coating method, in which the slot-die is typically held over the substrate at a height several times higher than the target wet film thickness. [23] The coating fluid transfers from the slot-die to the substrate via a fluid bridge that spans the air gap between the slot-die lips and substrate surface.
The roll-to-roll (R2R) coating system market is the production and application of continuous coating systems that deposit materials, whether liquid, powder, or film, onto a flexible substrate such as plastic, metal, or fabric utilizing roll-to-roll technology.
A simple method that anyone can do to determine volume solids empirically is to apply paint to a steel surface with an application knife and measure the wet film thickness. Then cure the paint and measure the dry film thickness. The percentage of dry to wet represents the percentage of volume solids.
In the mid-1960s, the US Navy developed aqueous film-forming foam (AFFF). This synthetic foam has a low viscosity and spreads rapidly across the surface of most hydrocarbon fuels. A water film forms beneath the foam, which cools the liquid fuel, stopping the formation of flammable vapors.
Nuth: Wet-setting hair into shapes and building wire structures to create hairstyles. This avoided the need for too many heated tools that can affect the color of the white and blond wigs.
A 35 mm optical printer with two projector heads, used in producing movie special effects and film restoration. Starting from the left, light is shining from the lamp house, then at A is the first projector's film gate, at B a lens that projects the film in A onto the second projector's wet gate C (note the white hoses for the liquid).