Powder coating; what it is and how it works
Powder coatings are important in the hot, sandy and dusty weather conditions of Pakistan. Especially in big cities like Islamabad, powder coating is a growing industry. Powder coatings are efficient to apply and they provide extreme durability. Therefore, industrial powder coatings are used in many pakistani industries such as general manufacture, automotive and marine.
Powder coating is a free-flowing, dry powder and is typically applied electrostatically.
A specially charged spray gun applies an electrostatic charge to the powder particles, which are then attracted to the grounded part. The electrostatic properties ensure that the powder coating sticks to the object. The object is then heated (cured) to its melting point, after which it flows to form a smooth film which dries to a firm, durable finish very resistant to scratches, cracking, peeling, UV rays and rust. Powder coatings are a mix of binder, additives, pigment, hardener and filler. Different applications require a different blend.
In this article we look at the benefits, application process, and equipment for powder coating, as well as providing you with a complete map of powder coating companies and manufacturers in Pakistan.
Top 10 benefits of powder coating
If there is one coating that is suitable for almost everything, it is powder coating. Liquid paint can be running, sagging and uneven; but powder coatings are applicable as dry, free flowing powder which cures to a smooth and texture free protective (and decorative!) layer. Powder coating is mainly used on appliances, in the automotive industry and on buildings in Pakistan.
Because of the hot and sandy weather conditions in Pakistan metal objects easily become damaged. The purpose of the coating is to protect the objects from UV-damage and sand will slide right off.
Concluding the top 10 key benefits of powder coating are:
- The process is easy to automate;
- It’s environmentally friendly;
- There is almost no waste
- The coating comes in powder form (light for shipment) and can be applied in one time;
- It does not need a solvent to become liquid, only heath
- The coating is elastic, abrasion and scratch resistant;
- There are many colors and finishes available;
- No dry down time. Coated materials can be transported and installed immediately;
- Coated materials are durable and easy to clean;
- Powder coating can be applied on many metal types and also on wood.
When it is better to opt for normal varnish instead of powder
Powder coating provides a more durable finish than liquid paints can offer, while still providing an attractive finish. Powder coatings are frequently a cost saving alternative to liquid paints with respect to energy savings, labour costs, rework costs, material usage, waste disposal, and overall line efficiency. The advantage to manufacturers and the consumers is a coated part with a superior quality finish at a reasonable cost.
Though unfortunately it does have some downsides. For example, objects that are not highly heat resistant can’t be powder coated. There are high temperatures required to liquefy the powder. The surface must also be completely spotless. When the surface is not completely clean, problems with adhesion will arise. Therefore, prior to applying the surface must be cleaned thoroughly.
Besides these downsides, it may also be better to opt for a normal protective and decorative paint, if:
- You can not afford a mechanical coating system (it is a substantial investment);
- If you need to paint in many different colors (If there is no quick-change booth it takes a substantial time to change colors);
Powder coating powder and equipment
If your company has its own powder coating line, or if you are planning to set up one, you need professional powder coating equipment. Powder coating equipment covers all machinery needed for powder painting process from start to finish:
- Powder application (guns, spray booths, fluid beds)
- Powder coating powder
- Curing (ovens)
There are many multiple powder coating powder compositions for example different:
- Properties (antibacterial, heat resistant etcetera.)
Powder coating in Pakistan – find a local specialist with our handy map
In Pakistan, powder coating companies are focused in the big cities such as Islamabad, Lahore and Karachi. One of them is the Pakistan Pakcoat. Above you can find a map, providing a more complete look at the powder coating companies which apply or manufacture powder coating in Pakistan. If you have a small powder coating project we recommend you find your local specialists. For industrial-scale powder coating projects, we are here to help you find the right company to suit the project.
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