June, 2012
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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 …
Advantages of UV powder coating systems
UV powder coating formulations consist of:UV powder resin,Photoinitiator,Additives,Pigment / extenders. Curing of powder coatings with UV light can be described as “the best of two worlds”. This new method makes it possible to benefit from the advantages of high cure speed and low cure temperature as well as environmental friendliness. The main advantages of UV curable powder systems are: Low system costs Application of one layer Maximum powder use with overspray recycling Low cure temperature High cure speed Hardly anyRead More …
Thermosetting powder coating are much more widely used
Thermosetting powder coating are applied by the electrostatic spray process, heated to the necessary temperatureand cured and are primarily composed of relatively high molecular weightsolid resins and a crosslinker.The formulation of thermosetting powders contain the primary resins:Epoxy,Polyester,Acrylic. These primary resins are used with different crosslinkers to produce a variety of powder materials. Many crosslinkers, or cure agents, are used in powder coatings, including amines, anhydrides, melamines, and blocked or non-blocked isocyanates.Some materials also use more than one resin in hybridRead More …
Urethane cured polyester powder coating
Urethane cured polyester powder coating has excellent resistance to outdoor environments, toughness and very good appearance characteristics at 1 to 2 mil film thickness.A smooth, thin film that resists weathering and physical abuse makes the urethane polyesters a popular finish for high quality products. It is common to block the crosslinker in urethane polyesters with ecaprolactam.To begin the cross linking process, the material must reach a temperature above the blocking agent threshold. With e-caprolactam, unblocking occurs at approximately 360 °F (182Read More …
Installation of spray booths
The powder supply and coating powder feedlines should be interlocked with the air extraction system,so that ,in the event of failure of the ventilatioon system,the coating powder and powder supplies are cut off.Airflow monitor switches are the preferred method of detecting failure of the ventilation system.Such equipment will also be sensitive to blocked filters and broken or loose fan blades. A fire detecting device,interlocked to shut off powder and coating powder supplies and ventilation may be installed in the boothRead More …
Location of stoving ovens
The stoving oven should be situated at least 1m from the powder spraying installation and arranged so that powder cannot accumulate or be spilled near to the oven,its air intakes,hot surfaces or any electrical apparatus.Air movement within the oven should not be so high as to blow off powder from the work piece before fusion . The clean air change requirement of the oven should be known and visibly marked on the oven. For conveyor ovens and especially those usingRead More …
How silver ions works in antimicrobial powder coating
Antimicrobial powder coating is widely used in many industries nowadays,such as Building Products,Food Service,Healthcare,Home Products and Packaging.This kind powders contain a silver ions,which act as antagonist over many bacterium. With the presence of moisture, silver ions are gradually released to function as an anti-microbial material. Silver ions charged with plus are drawn toward the microbe’s cell wall charged with minus to disturb the electrical balance. The cell wall of the microbe thus bursts and is extinguished. As silver ions enterRead More …
D5 Creation