Blade coating

In knife-over-roll or blade coating, the coating material is placed on the fabric surface behind a knife, or doctor blade, and metered according to the gap set between the blade and the fabric surface. This method is used to apply thick coatings of highly viscous materials such as pastes, plastisols, or foams. 

D. K. Stiaebaugh, Tappi Notes, 1990 Blade Coating Seminar, Tappi Piess, Adanta, Ga., 1990. 

Fig. 4. The effect of blade loading on the wet-coating thickness in flexible blade coating where ( ) represents a less stiff blade (B) represents a stiffer...

Figure 11-9. Blade coating requirements and coating evolution.

Wood, M.I., Developments in Blade Coatings Extending the Life of Blades Reducing Lifetime Costs , CCGT Generation, March 1999, HR Ltd. 

FIGURE 18.16 Three principal industrial coatings processes for films and thin sheets (a) roll coating (b) blade coating and (c) curtain coating. 

Compressor Blade Coating Coatings protect blades against oxidation, corrosion, and cracking problems. Coatings guarcTthe base metal of the compressor from attack. Other benefits include reduced... 

Screen Preparations, 100 micron thick x-ray intensifying screens were prepared using standard doctor blade coating techniques. The final phosphor volume was 50% when the coatings were dried. In most instances, the phosphor suspensions were prepared using polyvinyl butyral binders with viscosities adjusted to 2000 centipoise for the doctor blade operation and care was taken to avoid convection cell formation (9). A cross section of the screen construction is shown in Figure I. The completed screens consist of polyester (Mylar) base about 10 mil. thick, a 50 micron thick (TI02 (rutile) reflector layer, a 100 micron thick phosphor layer, a 10 micron thick clear cellulose acetate butyrate top protective layer. 

Derive an equation that will give the coating thickness in a blade coating operation schematically depicted in Fig. 6.74. Assume a Newtonian fluid and neglect inertia effects. 

Figure 6.74 Schematic diagram of a blade coating operation.

Blade Coating A schematic view of a blade-coating operation is shown in the accompanying figure, (a) Show that the coating thickness is Hc = Hq/ + Co)... 

Tseng. S. -R. Meng. H. -F. Lee. S. -F. (2008). Multilayer polymer light-emitting diodes by blade coating method. Applied Physics Letter, vol. 93, no. 15,153308-1-3. 

Baumung, I<., Muller, G., Singer, J., Kanel, G.I., and Razorenov, S.V. (2001) Strength of plasma sprayed turbine-blade coatings using an advanced spallation technique. J. Appl. Phys., 89 (11), 6523-6529. 

---