Gunless  Powder  Coating

A new revolutionary process for coils and blanks ( pre-punched metallic sheet )

In most cases, powder coating is performed   by electrostatic guns. If the desired coating capacity exeeeds  e.g. 10 m2 per minute  this may require between 10 – 20 guns depending on the geometrical  shape of the work-piece. It is of course possible to use less  guns, but, only by increasing the powder out-put and this will negatively affect   quality and economy. This also requires large spray booths  with high air volumes  and  high  compressed air consumption. Especially  when  flat coating for  e.g. coils and blanks. ( pre-punched od even pre-bent ) the guns blow against a large surface. This has a negative effect on the coating thickness tolerance and creates uncontrollable air circulations in the spray booth, particularly if the spray width is high.
 

Almost  50 % of the  coating output ( m2 per year ) for aluminium is produced on flat coating lines . Up to now, powder coatings have a limited deformability   compared to thin liquid coatings . But, in this respect considerable progress has been made. Powders with  Uretdione- cross linkers are very flexible and  allow the deep drawing of thin metallic blanks after powder coating. These powders are TGIC -free. Curing is performed at very high speed with IR-heaters. Pre-Coating systems require much less  energy and powder  than post-coating systems . and the investment cost as well as maintenance cost are much less.