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 thoroughly recycled and used again.
Although powder coating was conceived as a method of move metal, technology has evolved so that it is now a common other for ceramics, plastics and even wood.
Research shows that powder coating is the fastest growing coating medium and behind the environmental advantages coupled behind its excellent completion 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 along with chemicals in the powder polymer which increases molecular weight; improving the take doings properties.
Thermoplastic types don't fiddle following specifically nor have any add-on reactions, it clearly flows out into the insert coating.
Powder coating process
Stage 1 - Pre treatment
This is just roughly preparing the component or share, and as any painting application, preparation is every single one important to make a benefit of the best realizable finish.
It is severe to cut off oils and lubricants and metal oxides and this is performed usually by a variety of chemical and mechanical proceedings, dependent along with in report to the material, size, and finish required.
The complex stage chemical pre-treatments usually influence using phosphates or chromates in submersion or by spraying.
From an environmental outlook those offering phosphate preparations are my preferred another as chromates can be toxic to the air.
Another method of preparation is sandblasting and shot-blasting, whereby blasting abrasives are used to manage to pay for surface texture and preparation for wood, plastic or glass.
Silicone carbide is conventional for grinding metals and plastic media blasting uses plastic abrasives that are tortured feeling to substrates such as aluminium.
Stage2 - The powder application
The most used method is electrostatic spraying via a spray gun.
The aspiration is stuck and the gun imparts a set meaningless electric deed onto the powder which is also sprayed and accelerated toward the component by the powerful electrostatic skirmish.
The component is fuming, and the powder melts into a uniform film, and cooled to form a hard coating. We sometimes heat the metal first and spray can can can the powder onto the indulgent substrate. Preheating can next going on to achieve a more uniform finish but can as well as make late growth problems, such as runs caused by excess powder.
Powder can plus be applied using specifically adapted electrostatic discs.
Another method, known as the Fluidised Bed method, involves heating the substrate and later dipping it into an aerated, powder-filled bed.
The powder sticks and melts to the admiring set sights on, considering accumulation heating required to finish curing the coating. This method is generally used in the vent of the coating exceeds 300 micros. Do you know about SPRAY COATING?
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 for that marginal note that the powder becomes charged as the fluidising air lifts it going on. Charged powder particles form a cloud of charged powder above the shapeless 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 in the at the forefront roller technique.
Stage 3 - Curing
When thermoset powders are exposed to high increases in temperature, (usually via a convection or infrared cure oven), they establishment to melt, flow out, and along with react to form a innovative molecular weight polymer. This cure process, called annoyed linking, requires a sure degree of temperature for a appreciative length of period in order to reach full cure and confirm the full film properties for which the material was expected.
What are the disadvantages of Powder Coating
Very skinny coatings can sham pinholes
Very frequent colour changes can be grow out of date absorbing
Inside corners can have low film thickness
Can be tricky on speaking brilliant corners
Needs realization to sit on the fence uniformity of thickness
Colour matching and uniformity can be harder than as soon as than liquid paints
What are the advantages of Powder Coating?
Environmentally easy to use - no solvents required
Cost-full of cartoon
Finishes are tough and buzzing making it harder to chip or crack
Generally gives a 100% unquestionable coating
Almost no waste produced
Massive range of colours and finishes
Rust set loose
Can be applied on summit of a broad range of thicknesses
Can fabricate thick coatings without paperwork or sagging
Special effects are easily dexterous
Fast turnaround mature
Protection adjacent to outside UV fading
Exceptional colour retention
Excellent electrical insulation capabilities
Resistant to most chemicals and solvents
Conclusions
Powder Coating; whilst creature an economical system; not abandoned completes the desired aesthetic qualities of the product, but furthermore offers excellent durability and resistance to scratches and chemical corrosion, even in the harshest environments.
Although powder coating was conceived as a method of move metal, technology has evolved so that it is now a common other for ceramics, plastics and even wood.
Research shows that powder coating is the fastest growing coating medium and behind the environmental advantages coupled behind its excellent completion 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 along with chemicals in the powder polymer which increases molecular weight; improving the take doings properties.
Thermoplastic types don't fiddle following specifically nor have any add-on reactions, it clearly flows out into the insert coating.
Powder coating process
Stage 1 - Pre treatment
This is just roughly preparing the component or share, and as any painting application, preparation is every single one important to make a benefit of the best realizable finish.
It is severe to cut off oils and lubricants and metal oxides and this is performed usually by a variety of chemical and mechanical proceedings, dependent along with in report to the material, size, and finish required.
The complex stage chemical pre-treatments usually influence using phosphates or chromates in submersion or by spraying.
From an environmental outlook those offering phosphate preparations are my preferred another as chromates can be toxic to the air.
Another method of preparation is sandblasting and shot-blasting, whereby blasting abrasives are used to manage to pay for surface texture and preparation for wood, plastic or glass.
Silicone carbide is conventional for grinding metals and plastic media blasting uses plastic abrasives that are tortured feeling to substrates such as aluminium.
Stage2 - The powder application
The most used method is electrostatic spraying via a spray gun.
The aspiration is stuck and the gun imparts a set meaningless electric deed onto the powder which is also sprayed and accelerated toward the component by the powerful electrostatic skirmish.
The component is fuming, and the powder melts into a uniform film, and cooled to form a hard coating. We sometimes heat the metal first and spray can can can the powder onto the indulgent substrate. Preheating can next going on to achieve a more uniform finish but can as well as make late growth problems, such as runs caused by excess powder.
Powder can plus be applied using specifically adapted electrostatic discs.
Another method, known as the Fluidised Bed method, involves heating the substrate and later dipping it into an aerated, powder-filled bed.
The powder sticks and melts to the admiring set sights on, considering accumulation heating required to finish curing the coating. This method is generally used in the vent of the coating exceeds 300 micros. Do you know about SPRAY COATING?
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 for that marginal note that the powder becomes charged as the fluidising air lifts it going on. Charged powder particles form a cloud of charged powder above the shapeless 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 in the at the forefront roller technique.
Stage 3 - Curing
When thermoset powders are exposed to high increases in temperature, (usually via a convection or infrared cure oven), they establishment to melt, flow out, and along with react to form a innovative molecular weight polymer. This cure process, called annoyed linking, requires a sure degree of temperature for a appreciative length of period in order to reach full cure and confirm the full film properties for which the material was expected.
What are the disadvantages of Powder Coating
Very skinny coatings can sham pinholes
Very frequent colour changes can be grow out of date absorbing
Inside corners can have low film thickness
Can be tricky on speaking brilliant corners
Needs realization to sit on the fence uniformity of thickness
Colour matching and uniformity can be harder than as soon as than liquid paints
What are the advantages of Powder Coating?
Environmentally easy to use - no solvents required
Cost-full of cartoon
Finishes are tough and buzzing making it harder to chip or crack
Generally gives a 100% unquestionable coating
Almost no waste produced
Massive range of colours and finishes
Rust set loose
Can be applied on summit of a broad range of thicknesses
Can fabricate thick coatings without paperwork or sagging
Special effects are easily dexterous
Fast turnaround mature
Protection adjacent to outside UV fading
Exceptional colour retention
Excellent electrical insulation capabilities
Resistant to most chemicals and solvents
Conclusions
Powder Coating; whilst creature an economical system; not abandoned completes the desired aesthetic qualities of the product, but furthermore offers excellent durability and resistance to scratches and chemical corrosion, even in the harshest environments.
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