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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 abundantly recycled and used as soon as more.

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

Research shows that powder coating is the fastest growing coating medium and taking into account than than the environmental advantages coupled later its excellent hard worker 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 in the midst of chemicals in the powder polymer which increases molecular weight; improving the group properties.

Thermoplastic types don't fine-atmosphere specifically nor have any adjunct reactions, it as a consequences flows out into the definite coating.

Powder coating process

Stage 1 - Pre treatment

This is approximately preparing the component or part, and as any painting application, preparation is every portion of important to benefit the best realizable finish.

It is indispensable to surgically remove oils and lubricants and metal oxides and this is performed usually by a variety of chemical and mechanical events, dependent furthermore in bank account to the material, size, and finish required.

Do you know about SPRAY COATING?

The fused stage chemical pre-treatments usually concern using phosphates or chromates in submersion or by spraying.

From an environmental turn those offering phosphate preparations are my preferred other as chromates can be toxic to the setting.

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 customary 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 gun.

The direction is ashore and the gun imparts a unbending electric engagement onto the powder which is later sprayed and accelerated toward the component by the powerful electrostatic onslaught.

The component is enraged, and the powder melts into a uniform film, and cooled to form a sophisticated coating. We sometimes heat the metal first and spray the powder onto the hot substrate. Preheating can by now taking place to achieve a more uniform finish but can also make accumulation problems, such as runs caused by excess powder.

Powder can then be applied using specifically adapted electrostatic discs.

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

The powder sticks and melts to the hot seek, when late extra heating required to finish curing the coating. This method is generally used gone the coating exceeds 300 micros.

Electrostatic Fluidised Bed Coating: Electrostatic fluidised bed application uses the thesame fluidising techniques as above but subsequent to much less powder extremity in the bed. Electrostatic charging occurs in the bed thus that the powder becomes charged as the fluidising tolerate breathe lifts it taking place. Charged powder particles form a cloud of charged powder above the formless bed. When a stuck 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 when 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 also react to form a compound molecular weight polymer. This cure process, called fuming linking, requires a certain degree of temperature for a pure length of era in order at the forefront full cure and avow the full film properties for which the material was meant.

What are the disadvantages of Powder Coating

Very skinny coatings can leisure motion pinholes
Very frequent colour changes can be period absorbing
Inside corners can have low film thickness
Can be tricky vis--vis scratchy corners
Needs suppleness to preserve uniformity of thickness
Colour matching and uniformity can be harder than as soon as liquid paints
What are the advantages of Powder Coating?

Environmentally cordial - no solvents required
Cost-on the go
Finishes are tough and supple making it harder to chip or crack
Generally gives a 100% solid coating
Almost no waste produced
Massive range of colours and finishes
Rust release
Can be applied anew a broad range of thicknesses
Can fabricate thick coatings without handing out or sagging
Special effects are easily light
Fast turnaround era
Protection adjoining outside UV fading
Exceptional colour retention
Excellent electrical insulation capabilities
Resistant to most chemicals and solvents
Conclusions

Powder Coating; whilst mammal an economical system; not unaccompanied completes the desired aesthetic qualities of the product, but as well as offers excellent durability and resistance to scratches and chemical corrosion, even in the harshest environments.



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