PRINCIPLE OF POWDER COATING
The principle of powder coating, which our company Technolak, s.r.o., performs, is the application of powder to the surface of a part and subsequently hardening it in an oven. The powder contains resin, pigment, possibly also hardening agents and additives, and therefore creates a dry, powdery consistency.
Compressed air is used to apply powder to a part and after mixing with the powder it forms a “liquid mixture”. So that the powder adheres to a part (and does not fall off before it is hardened in the oven), electrostatic energy is added to it in an application device (it is “charged”). The electrostatic energy makes use of a physical phenomenon, which is that particles with opposite charges attract each other. This causes the powder particles to be attracted to the part being sprayed and subsequently to adhere to the part’s surface.
TWO BASIC METHODS ARE USED TO “CHARGE” POWDER:
1. ELECTROSTATIC CHARGING, STATIC (CORONA)
Powder particles are “charged” using a high voltage electrode, located by the mouth of the application gun. This method of charging is very fast and effective, but it is not suitable for parts with deep crevices.
2. ELECTRO-KINETIC CHARGING (TRIBO)
The powder particles are “charged” using friction in the application guns and hoses, produced, for example, from Teflon. This method of charging is not as efficient as CORONA, but it is more appropriate for parts with crevices.
BENFITS OF POWDER COATING
- The coated layer is resistant to impacts, e.g. gravel, stones, etc.
- Good anti-scratch resistance
- Excellent external durability
- High chemical resistance
USES OF POWDER COATING
Powder coating is suitable for the following products: white goods (washing machines, fridges, cookers, microwave ovens), metal furniture and home accessories, safes, locks, coat-stands, covers for consumer electronics and computers, bikes, sports goods and exercise machines, office and study products, magnetic boards, small items we ordinarily encounter (shoehorns, openers), parts for the automotive industry (brake pads, wheels, metal interior parts, a number of motorcycle components), radiators, fire extinguishers, letterboxes, lights and lamps, bottles for perfumes and some types of alcoholic drinks, decorative flowerpots, cigarette and tobacco cases, electricity fuse boxes, metal soffits, fittings and many others.