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Electrical Applications Enamels, including solvent-based, water-based and combination of the two, are the dominant class of industrial finishes today. Most require evaporation of solvents and curing at elevated temperatures to polymerize a cross link of finish, then final cure by oxidation. Fostoria electric infrared ovens provide the even, mar-proof finish required, in one-third the time of convection systems. In addition, the ability to control intensity of cure prevents a "too hard" finish which would result in brittleness. Plastisols are ultra-tough coatings that are 100% solids. The optimal cure is 30 seconds to 3 minutes. Two critical considerations make infrared the most effective curing method. First, as plastisol cures, it emits plasticizer, which vaporizes, smokes and condenses as a heavy liquor. This material must be collected in a predictable way to prevent contamination of the part and the process and to allow a thorough cure. Second, to achieve a fusing temperature, the substrate must exceed the curing temperature by a specified degree. Both are only possible through the precise control of heat sources and the oven environment found with electric infrared ovens, such as those designed and manufactured by Fostoria Industries. Special Effects such as Hammers and Wrinkles are essentially enamels with a heavy content of metal flake or powder that separates and "floats" into a desirable pattern. The wrinkles contain slow-drying oils which separate from the base coat and require an "interrupted" cure. A 1-10 minute hold allows the oil to separate. Infrared curing for 3-5 minutes in a Fostoria electric infrared oven produces the ideal "soft" cure.
Liquid Paint Systems electric infrared process heating equipment is the curing technology of choice for manufacturers of metal, plastic, and composite parts using either liquid paint finishes or powder coating systems.Engineers have designed process heating systems that effectively cure oil finishes, advanced lacquer finishes, enamels, plastisols and special effect finishes such as wrinkles and hammers. Oil finishes incorporating solvents or reducers are cured to tack-free using low temperature infrared; the final cure occurs through oxidation of the finish. Because such finishes are applied at heavier millages than other coatings, convection ovens are prone to scorch the paint surface before the area nearest the substrate had cured. This results in wrinkling of some finishes, uneven drying, and sealing of the surface before the solvent has been liberated. These problems are avoided with electric infrared ovens due to infrared's ability to quickly and evenly penetrate the film, particularly during the initial stages of the heating cycle.
Advanced lacquer finishes are typically applied in several coats, with drying between each. Unassisted drying between coats is possible, particularly when finish quality is not critical. However, unless humidity is constantly low, moisture in the air will deposit on the surface, causing blushing of the lacquer. This is repaired through time consuming and costly polishing. Best results are achieved with a Fostoria electric infrared oven producing a cure in 15 seconds to 2 minutes for each coat. Highly consistent drying temperatures (between 150 and 200 degrees F. depending upon the individual coating) produce an even finish and eliminate the blushing problem.
Adhesives - Fostoria Electric Infrared Ovens accelerate the cure rate of adhesives
including acrylics, anaerobics, silicones, epoxies, methacrylates and urethanes.
Powder Coating Systems For precise curing for thermoset and thermoplastic powders, industry has come to rely on Fostoria Electric Infrared Ovens. There are more than 300 powder formulations in use today. Film thicknesses range from under 1 mil to over 15 mil and the range of colors, gloss and applications is equally as vast. What these diverse powder formulations do have in common, is near-perfect compatibility with infrared radiation as a method of curing. Existing convection ovens are in many cases totally replaced with Fostoria Infrared Ovens. In other cases existing convection ovens are supplemented with an infrared booster ahead of the convection line. Infrared can be applied before the powder application and for primary curing.
A wash cycle always precedes the application of the powder, and removal of residual water is essential before powder is applied. A Fostoria oven rapidly brings parts to 225 degrees F (or higher if desired), and evaporates all moisture. Fostoria ovens can also combine drying and preheating cycles into a single process when necessary.During primary curing electric infrared offers the advantages of producing no combustion products to contaminate the curing area, and more importantly, does not rely on moving air to distribute heat. Air movement will disturb powder, resulting in uneven curing, and will deposit dirt and other contaminants on the surface being coated, resulting in rejects.
Because the customer has a variety of wheel shapes to cure, the "zone
control" flexibility of infrared was important. The oven was designed with
zone control to redistribute the heat "footprint" and intensity of
the heat to match individual products without delaying production. The additional
benefit of this solution is a reduction in paint contamination because of the
accelerated curing speed and the absence of air movement, which would be necessary
in a convection curing system.
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