The fabrication facility also includes an electrostatic powder coating plant.
After machining the steel parts are checked to remove any burrs on their edges or surface and welded parts are surface ground to remove all excess weld material and spotting to a fine flat finish suitable for the automated paint process.
In line with our BSEN 9001 quality assurance system each batch of paint is subject to several tests prior to painting the steelwork. A sample plate is powder painted and cured at 140-210oC for 12-20 minutes, the sample is then checked for colour match and paint adhesion and finally the sample is checked visually for surface defects, paint spots or blemishes.
Each product goes through a pre-treatment process of cleaning / rinsing / phosphating / drying utilising multi-directional spray heads to ensure that all parts of the steelwork are covered.
The powder paint is then applied using an electrostatic process via manual and spray guns. The powder is applied to produce a fully protective coating to all surfaces with a minimum acceptable dry film paint thickness of 50 microns.
The final process utilises a pre-heated oven, temperature and curing times are dependent upon the paint manufacturers’ specifications but typical ratings are 140-210oC for 12 to 20 minutes.
The complete system is run on an overhead continuous conveyor with adjustable speed control. This enables the operator to have full control over the process and ensure that parts are adequately coated prior to curing (by reversing the line and re-applying powder if necessary).