Operational Limits of Blade Coating Associated with High Aspect Ratio Pigments, 2018 Advanced Coating Symposium

Process issues such as blade deposits, spits and defects on the coating surface develop during blade coating of paper at high solids content and medium to fast machine speeds. A coating that contains high aspect ratio pigments display these issues at lower solids concentrations and slower web speeds than spherical or block shaped pigments. The rheology, particle packing, and water retention are all functions of the pigment shape and size distribution and the state of colloidal dispersion. The base sheet properties of porosity, surface roughness and permeability interact with the coating and blade coater operating conditions. The possible causes of poor runnability are part of an interrelated and complex system. 


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