The Powder Coating Process

 Generally powder coating may be regarded as an environmentally favoured method of applying a finish particularly as it avoids the use of solvent-based paints avoids overspray wastage, and any unused powder may be adequately recycled and used following again.

Although powder coating was conceived as a method of doing metal, technology has evolved thus that it is now a common unconventional for ceramics, plastics and even wood.

Research shows that powder coating is the fastest growing coating medium and following the environmental advantages coupled also its excellent act properties, it is a trend that is likely to continue.

Types of powder coating

There are two main types of powder coatings; thermosets and thermoplastics

With thermosetting variations, as the powder bakes, it reacts once chemicals in the powder polymer which increases molecular weight; improving the undertaking properties.

Thermoplastic types don't fiddle following specifically nor have any choice reactions, it valuably flows out into the unqualified coating.

Powder coating process

Stage 1 - Pre treatment

This is roughly preparing the component or portion, and as any painting application, preparation is all important to achieve the best viable finish.

It is valuable to remove oils and lubricants and metal oxides and this is performed usually by a variety of chemical and mechanical dealings, dependent as well as a propos the material, size, and finish required.

The union stage chemical pre-treatments usually have emotional impact using phosphates or chromates in submersion or by spraying.

From an environmental approach those offering phosphate preparations are my preferred unconventional as chromates can be toxic to the atmosphere.

Another method of preparation is sandblasting and shot-blasting, whereby blasting abrasives are used to have enough maintenance surface texture and preparation for wood, plastic or glass.

Silicone carbide is confirmed for grinding metals and plastic media blasting uses plastic abrasives that are sensitive to substrates such as aluminium.

Stage2 - The powder application

The most used method is electrostatic spraying via a spray can can can can gun.

The plan is ashore and the gun imparts a determined electric feat onto the powder which is later sprayed and accelerated toward the component by the powerful electrostatic exploit.

The component is mad, and the powder melts into a uniform film, and cooled to form a option coating. We sometimes heat the metal first and spray can the powder onto the hot substrate. Preheating can declare to achieve a more uniform finish but can moreover make auxiliary problems, such as runs caused by excess powder.

Powder can moreover be applied using specifically adapted electrostatic discs.

Another method, known as the Fluidised Bed method, involves heating the substrate and along with dipping it into an aerated, powder-filled bed.

The powder sticks and melts to the ardent dream, back adding going on heating required to finish curing the coating. This method is generally used gone than the coating exceeds 300 micros.

Electrostatic Fluidised Bed Coating: Electrostatic fluidised bed application uses the same fluidising techniques as above but considering much less powder intensity in the bed. Electrostatic charging occurs in the bed fittingly that the powder becomes charged as the fluidising setting lifts it taking place. Charged powder particles form a cloud of charged powder above the shapeless bed. When a beached portion is passed through the charged cloud the particles will be attracted to its surface. The parts are not preheated.

Electrostatic Magnetic Brush (EMB) coating is a coating method for flat materials that applies powder coating once roller technique.

Stage 3 - Curing

When thermoset powders are exposed to high increases in temperature, (usually via a convection or infrared cure oven), they begin to melt, flow out, and with react to form a far and wide away ahead molecular weight polymer. This cure process, called livid linking, requires a flattering degree of temperature for a certain length of period in order to make a gaining of full cure and avow the full film properties for which the material was expected.

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What are the disadvantages of Powder Coating

Very skinny coatings can accomplish a portion pinholes

Very frequent colour changes can be grow olden consuming

Inside corners can have low film thickness

Can be tricky upon argumentative corners

Needs execution to part uniformity of thickness

Colour matching and uniformity can be harder than following liquid paints

What are the advantages of Powder Coating?

Environmentally comprehensible - no solvents required

Cost-working

Finishes are tough and nimble making it harder to chip or recess

Generally gives a 100% solid coating

Almost no waste produced

Massive range of colours and finishes

Rust clear

Can be applied bearing in mind more a wide range of thicknesses

Can fabricate thick coatings without processing or sagging

Special effects are easily competent

Fast turnaround time

Protection touching outdoor UV fading

Exceptional colour retention

Excellent electrical insulation capabilities

Resistant to most chemicals and solvents