The powder coating process is the most durable finish for metal substrates. Powder coating provides the best outstanding protective finish that withstands exposure to the elements of weather, chemicals and a variety of abuse. Plus, there is a wide variety of choices: COLOR, TEXTURES, SHEENS.
To ensure the finish looks as nice as possible, we start you product on our conveyor belt with a five-stage pretreatment system. Next, your product is painted and placed in an oven where the powder is baked. Once completed, your product has a durable finish with a reduced risk of chipping or fading.
Here at Precision Metal Forming, LLC we apply the highest quality powders with a long-lasting finish provided by top powder manufacturers in the industry. We do a variety of tests to insure our consistent quality.
Fluidized Sand Bed Stripping
Fluidized sand bed stripping is a method in removing cured powder coatings. The process uses an inert media (sand or oxides) that are used as a heat transfer medium. In sand bed system, natural gas and air are forced through the medium and are ignited at the surface of the medium. This transfer of heat fluidizes the medium. The product with the cured powder coatings is then lowered into the tank of fluidized medium at a temperature of approximately 800F. The medium begins breaking down the powder coating on the the product and the agitation of the fluidized medium removes any ash on the product. The normal time frame for the product to be in the tank is relatively fast – about 30-60 minutes.
- There is no damage to parts because the heat is dispersed equally in the tank.
- Products cleaned in this method require minimal cleaning efforts to be prepared for the recoating process.
- The fluidized sand bed stripping method is safe and environmentally friendly.
- There are no toxic chemicals used or hazardous waste generated.
Powder Coating Process:
The basic process of powder coating is a 5-part process. Here is a step-by-step guide to powder coating and protecting metal.
- Part Preparation – Sandblasting/sand stripping is the best way to prep a metal surface in need of restoration. The point of blasting is to remove any mil-scale rust and rough up the surface prior to coating. It removes dirt, grime, rust, corrosion. It also removes existing painted or powder coated finishes. All types of metal can be blasted such as alloys, aluminum, steel, iron, etc. Sometimes coaters will use a chemical strip process prior to abrasive blasting to keep the blast time down to a minimum. If you have a new metal project you can sometimes by-pass this step. The powder coater will be able to make this determination. Each piece must be cleaned, etched, rinsed, and dried; being sent through a dryer conveyer system.
- Powder Application– When fully prepped, cleaned and dry your metal project will be ready for powder coating. The coating itself is done through an electrostatic process, whereby, the metal object is positively charged in order for the powder to be attracted to it and bond well during the next stage. There are many colors and brands of powder to choose from depending on the needs of the customer and the end use of the project.
- Curing – The cure times for metal can range depending on how long it takes the oven to get to temp and the size of the oven. Typically degrees ranging from 340 to 400 degrees Fahrenheit are required for the powder to heat up enough to bond. During this time, the powder reaches its proper temperature and begins to chemically react, forming a molecular weight polymer in a network like structure. A coater’s oven should evenly displace the heat so that your part is heated throughout for the curing process to be done correctly.
- Inspection– After the curing process, a careful inspection is done by operator to ensure its pristine condition.
- Packaging– After careful inspection of each piece, each piece is ready to be packaged and shipped directly to customer.