The purpose of this study was to evaluate the feasibility of using highly filled powders as electrostatically applied
paper coatings. Powders prepared by two different methods were suitable for electrostatic deposition and they
attached to the paper surface with a grounded backing. Pressing at elevated temperatures turned out to be a crucial
process step for improving the adhesive and cohesive strengths of the powder coating layer on paper. Limited
mechanical interlocking with the base paper and an uneven pressure profile were factors impairing the surface
strength of the coated paper. On the other hand, factors such as higher polymer content, higher pressing temperature,
pre-heating the paper prior to coating, and increasing the number of hot roll nips increased adhesion
between the coating and the base paper. Powder coatings as such had uneven thickness, and they displayed a
relatively broad pore size distribution.
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