Triboelektrisches Beschichtungspulver und Verfahren zur Beschichtung von Holz

摘要

An electrically chargeable dielectric coating powder and a triboelectric coating process for applying the powder to wood substrates are described. The coating powder is a mass of finely divided, heat fusible dielectric plastic material having an average particle size (Mv) of between 30 and 45 mu m and a particle size distribution (all percents defined in weight percent) of: 95% - 100% smaller than 88 mu m, 5% - 15% smaller than 15.56 mu m and 0% - 6% smaller than 11 mu m. Preferably the coating powder has 0% larger than 88 mu m and an Mv = 30 - 40, preferably 35 - 40 mu m. More preferably the particle distribution further includes: 10% - 15% smaller than 15.56 mu m and 4% - 6% smaller than 11 mu m, and an Mv of between about 35 and 36 mu m. Most preferably the particle distribution further includes: about 11.5% smaller than 15.56 mu m and about 4.3% smaller than 11 mu m, and an Mv of about 35.9 mu m. Preferably the powder is a thermosetting resin composition.