Powder-coating also called electrostatic coating or thermoplastic paint, is a method of painting that we use to ensure an even and long lasting finish. It involves spraying the product with fine powder paint and then curing it in an oven to ensure a strong bond. It guarantees a bright, smooth finish without letting the paint run. Read on to learn more about the advantages of the powder coating method we use at Sino Concept.
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The process of powder coating generally involves three separate stages: Pre-treatment, coating and curing:
To ensure an even coat and strong bond, the product must first be thoroughly cleaned. This step removes any dirt, oil, lubrication greases, metal oxides or welding scale that could spoil the finish. The part is cleaned, degreased and pickled to prevent re-oxidization. With the cleaned and prepared pieces, we can begin the powder coating process.
For the second step, we use an electrostatic spray gun to apply a fine coat of powder paint on the products. The gun charges the paint particles ensuring that they stick to the part at a thickness of roughly 100 microns. The powder coating is applied inside a ventilated cubicle with powder recovery system, so any over-spray can be collected and reused to reduce waste.
The powder coating used for the finishing of our products is without solvent and does not cause any hazards to workers. Even with those good conditions, a protection is necessitated to avoid workers inhale the powder coating.
Once the powder is applied, the product is placed into an oven to dry and cure. We call this process “polymerization”. This ensures a strong bond between the new coat of paint and the surface of the product.
When the product is ready, it undergoes a final quality control inspection before passing on to packaging.
A thin polymer film is deposed. Afterward, the metal is rinsed and dried. The pre-treatment can be done by a variety of chemical and mechanical methods. Depending on the size, the material which needs to be powder coated and the types of impurities, the method for the powder coating will be different.
The most common way to apply powder coating on metal surfaces is to spray the powder using an electrostatic gun, or corona gun.
After being powder coated, the products are put inside an oven with a temperature of 200°C.
It is this step that allows the polymerization of the paint and hardeners which react to temperature.
The time spent in the oven varies according to the size of the products and the oven’s temperature. On average it is about 30 minutes.
The powder coat is really difficult to remove thanks to its strong quality. Most of organic solvents are ineffective, but methylene chloride and acetone are well known to be the best removers for powder coatings. An abrasive blasting process can also remove the powder coating effectively.
So why would you powder coat a product when you could just spray liquid paint and let it dry? Powder coating offers distinct advantages over other painting techniques.
These are some of the main benefits of electrostatic coating:
Powder coatings are 100% solid - meaning no solvents, no fumes, and no dangerous gasses. While liquid finishes contain solvents which contain pollutants known as volatile organic compounds (VOC's), powder coating releases minimal, if any, amounts of VOC's into the atmosphere.
The electrostatic coating can be applied with much higher efficiency than wet paints because over-sprayed powder can be collected and then re-applied. This means that 99% of the original product can be used, resulting in minimal waste.
We can powder coat products of any size including accessories, precision sheet metal, and welded elements. Sino Concept specializes in the powder coating of various products: Pedestrian barriers, hoop barriers, bollards, wave bike racks and many more. For a clean and professional look, we are also able to completely powder coat joints, profiles, etc.
All products are powder coated according to your choice of RAL or Pantone color codes and are therefore available in a seemingly endless variety of colors. RAL is the most popular Central European Color Standard used today (German origin). Pantone is the most popular USA-based color range used today.
We can apply a wide range of textures and finishes: - Grain - Textured - Sand - Matte - Satin – Glossy. Powder coating is available in virtually any color and the finish is rust free, scratch resistant and cost efficient.
With our many years of experience in powder coating, we are able to manufacture the products you need to the specifications that you require.
To see some examples of our powder coated products, like our sidewalk railing, please visit our street furniture product pages.
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