Fluid bed coolers for urea formaldehyde resin: In industrial production, urea resins are made by the condensation of formaldehyde and urea in an aqueous solution, using ammonia as an alkaline catalyst. The condensation reaction gives a colourless, syrupy solution that can be dried (and cooled) to a powder or granules for later use in coatings or adhesives; it can also be mixed with cellulose filler to produce powders for molding into solid objects. Urea-formaldehyde resins are used mostly as adhesives for the bonding of plywood, particleboard, and other structured wood products.
