Flow-coating

Objects to be flow coated are coated on a conveyor through an enclosure in which streams of coating are squirted on them from all sides. The excess material runs off and is recirculated through the system. There is still some thickness gradation, but much smaller than in dipping. 

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Dispersion Resins. Polytetrafluoroethylene dispersions in aqueous medium contain 30—60 wt % polymer particles and some surfactant. The type of surfactant and the particle characteristics depend on the appHcation. These dispersions are appHed to various substrates by spraying, flow coating, dipping, coagulating, or electro depositing. 

Flow coating In this process, paint is directed on to the workpiece from a series of strategically placed jets in an enclosed area and the excess paint... 

Flow coating Suitable for use on most articles. Gives good penetration into pores of castings Similar to dipping, but the defects not so marked. Tendency for greater solvent loss. 

Flow-coating and hand spray-gun application is sometimes employed where a relatively small number of large articles has to be phosphated. 

Flow Coating Polymer Film Thickness Gradients. 66... 

Film thickness can govern the morphology, stability, and surface-chemical expression of polymeric thin films. NIST researchers developed a process for producing gradients, termed flow coating, which is a modified blade-casting technique [3-5]. How coater instrumentation and the flow coating process are illustrated in Fig. 2. To create the library, a dilute solution of polymer in solvent (1-5% mass fraction) is injected into the gap between a doctor blade positioned over a flat substrate... 

Stafford CM, Roskov KE, Epps TH, Easolka MJ (2006) Generating thickness gradients of thin polymer films via flow coating. Rev Sci Instrum 77 023908... 

Other types of equipment that can yield even higher efficiency values are roller and flow coating machines (90 to 98%) and electrocoating systems (90 to 99%). Roller and flow coating machines, however, are limited in their applicability based on the shape of the parts. Electrocoating systems require a shift from solvent-based to waterbased paint. 

PTFE aqueous dispersions are applied onto metal substrates by spraying, dipping, flow coating, electrodeposition, or coagulation to provide chemical resistance, nonstick, and low-friction surfaces. Nonstick cookware and bakeware are made from dispersion specifically formulated for that purpose with the use of a primer for the metal. After coating, the parts are dried and sintered. 

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