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How to select a proper powder for your products
Choice of resin system, hardener, and pigment is just the beginning in selection the properties that one may require of the finish. Control of gloss, smoothness, flow rate, cure rate, ultra violet resistance, chemical resistance, heat resistance, flexibility, adhesion, corrosion resistance, exterior durability, ability to be reclaimed and reused, total first time transfer efficiency, and more, are some of the factors that must be considered when any new material is manufactured. Thermosetting powder coating are classified into five basic chemicalRead More …
Screen your powder before application
Screening of powder coating powder is very important,that will separate out contaminants, insure uniform particle size distribution,and allow the system operator to fine tune the application equipment without puffing or surging for maximum transfer efficiency and finish quality. Actual on-line test results have shown that screened powder will cover much more area than the same material unscreened. The most common reason that powders puff and surge during application is due to the lack of screening. Powders may become compressed inRead More …
General reasons for pin holes in a process of powder coating wheels
You will be experiencing pin holes when you powder coat wheels of cast aluminum . Pin holing can be caused by several different things, in this case I would say that the alloy wheels are porous and the air in the pore is expanding when the parts are heated in the oven. The air then escapes into the powder film when the powder is in the liquid or melted state and as the powder solidifies during the curing process theRead More …
Some common sources of airborne contamination during powder coating application
Electrostatically applied powder can entrain airborne dirt and deposit it on the parts. They are the hardest to track and eliminate because they can come from so many different sources. Keeping a clean environment around the system is one of the best ways to reduce air borne dirt.The list below names some of the common sources of airborne contamination during powder coating application Process Equipment – The conveyor, the oven, the washer or other operations within the coating line can generateRead More …
Adhesion problem of powder coating application
Poor adhesion is usually related to poor pretreatment or under cure. Undercure -Run an electronic temperature recording device with a probe on the part to ensure that the metal temperature reaches the prescribed cure index (Time at temperature). Pretreatment – Perform regular titration and quality checks to avoid a pretreatment problem.Surface preparation is probably the cause of the poor adhesion of the powder coating powder. Not all stainless steels accept phosphate pretreatments to the same extent; some being more reactiveRead More …
Advantages of wood powder coating on wood furniture
Several furniture and cabinetry manufacturers have had success with wood powder coating MDF. Pigmented powder applications to MDF have been developed and used more extensively than coating of natural wood, or clear coating of MDF. Establishing a new system may require significant research and production trials to achieve desired process efficiency and final product quality. Powder coatings has a high transfer efficiency, reduced (or no) emissions, one-step, one-coat process, elimination of edge banding, significant reduction of exhaust and oven ventilation air,Read More …
The process steps for powder coating on wood
Process steps for wood powder coating applications follow: Preconditioning: The substrate is evenly heated in infra red(IR) and/or convection ovens to achieve required conductivity,and release gasses. Typically, the substrate surface temperature is equalized at 200-220° F before entering the spray booth,although some have had success at lower temperatures. Woodmoisture must remain equalized across the surface at about 4 to 6% or higher to maintain conductivity for powder adherance.Since heat evaporates moisture, careful controls on preheating are necessary. Application: After preheating,Read More …
How to Powder Coat on Wood Products
Some woods and wood products such as MDF have sufficient and consistent moisture content to provide conductivity and can be coated directly. To enhance electrostatic attraction, wood can be pretreated with a spray solution that provides a conductive surface.The part is then preheated to a desired coating temperature, which softens or partially melts the powder when it is applied and helps the powder adhere to the part where it melts a little on impact.A uniform board surface temperature allows forRead More …
Powder coating over non-metal products,such as plastic,wood
Over the last twenty years, powder coating has revolutionized the finishing industry by providing a superior, durable, environmentally friendly finish, particularly for metal products such as appliances, automotive parts, sporting goods and countless other products.However with the development of powder coatings that can be applied and cured at low temperatures,the market has opened to heat sensitive substrates such as plastics and wood. Radiation curing (UV or electron beam) allows the curing of powder on heat sensitive substrates by reducing theRead More …
Alkaline Cleaning for substrate
Alkaline cleaners are the most common method of soil removal for metal preparation prior to the application of powder coatings. Cleaners based on sodium hydroxide (caustic) are very economical where cleaning by saponification is desirable. Caustic cleaning media are highly reactive on non-ferrous surfaces and they can cause over-etching on aluminum and zinc surfaces, possibly creating smut and adding zinc to the solution. Caustic cleaning residues are also difficult to rinse away, especially if the solution temperature is in the high range. Alkali silicatesRead More …
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