Dipcoating in a fluidised bed

Procedure

Rilsan and Resicoat are powder coatings, which can be applied by dipcoating in a fluidised bed. Kersten Kunststofcoating uses this unique procedure to apply coatings to pipe systems and other constructions.

The procedure is:

Dipcoating

• Check on arrival to ensure all products are suitable for coating.
• Grit blasting SA 2½.
• Remove dust an apply primer.
• Preheat products in ovens to above the melting temperature of the powder coating.
• Dipcoat in a fluidised bed.
• Quality control.

The preheated products are coated in a dipcoat installation, which includes a reservoir for the powder. Air is blown through the porous bottom of this reservoir, to fluidise the powder. The temperature of the products causes the powder to melt to a pore-free and homogeneous coating.

Quality is inspected after the products have cooled down. On request the coating will be certified according to the BRL-K746 quality system. The coating is certified by:

• Checking the thickness of the coating. The average coating thickness should be 400 µm with a minimum of 300 µm.
• Checking the pore-freedom. The medium side of the coating is checked for pores with a spark test. The surface is tested with a voltage of 9 V/µm.
• Affixing the certification sticker to the product provided that the coating satisfies BRL-K746 requirements.

Oven and dipcoat installation	Coating thickness measurment