What is Powder line Coating and Why is it so important to use powder line coating?

Powder line Coating

Powder coating is when powder is used in its dry form which is fine directly to the surface to be coated. Each powder particles contains resins, pigments, extenders and modifiers. Most powder coatings are reactive.

Why is it so important to use powder coatings?

  1. It is easy to use it
  2. It doesn’t require too much money in costs
  3. Safety in using it and on storage, low fire hazards
  4. Absence of solvents
  5. Resistant to chipping, scratching, abrasion and bending
  6. No or very little atmospheric pollution

Powder coatings are applied to parts using either a fluidized bed or electrostatic spray. The part to be powder coated is grounded and the powder is charged, this attracts the powder to the part.

How to make a powder coating?

Powder coating is made by mixing resin with pigments, modifiers, leveling agents and other chemicals. All are melted while mixed then they cool them and ground into powder.

In this process we use an extruder or a grinder.

This is an extruder for manufacturing powder coating.

 

Powder line - Extruder
Powder line – Extruder

This is a grinder for manufacturing powder coating.

 

Powder line - Grinder
Powder line – Grinder

 

Powder coating types:

thermoset powder coating: they are composed of high molecular weight resins and a crosslinker. Primary resins used are epoxy,polyester and acrylic.

thermoplastic powder coating:Thermoplastic Powders do not chemically crosslink upon application of heat, but melt and flow over the part in the oven. For example:nylon,polyester,polyvinyl chloride,polyethylene,polypropylene,..

 

Powder coatings are very safe and can’t cause environment pollution compared to solvent borne paints.

Some powders may contain heavy metals such as lead,mercury,cadmium and chromium.

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