The Process of Paper Impregnation is known as Low Pressure Lamination.
To attain attractive and durable surfaces for furniture and flooring, wood based panel boards are usually overlaid with printed or solid color paper. Such decor paper is impregnated with melamine and urea resins in specially designed impregnation treaters.
Impregnation treaters are specially designed for the Process of Resin Distribution.
Usually, such treaters have two sections: one to saturate the core of the paper with urea or melamine resin, and the second to coat the paper surface with pure melamine resin. Both sections consist of an application unit, and a series of drying ovens. The process requires that the resin be uniformly distributed within the paper core and on its surface.
High quality paper impregnation is achieved by the right choice of resin and additives.
High quality paper impregnation is achieved by careful adjustment of the resin viscosity and line speed, and by the right choice of resin and additives. Specially designed latent catalysts or hardeners are needed to adjust the resin reactivity. Uniform penetration and even surface coating is accomplished through the obligatory use of special purpose wetting agents. Furthermore, it is important to minimize dust formation in order to achieve a clean and smooth surface. This is usually reached with the aid of anti-dust and film smoothing agents.
All additives and catalysts are added to the resin right before the impregnation process.
After drying, the impregnated papers can be stored for several months before being laminated onto wood based panel boards. During hot-pressing or thermo-fusing, the resin in the paper softens sufficiently to bond with the substrate. Subsequently, the resin cures to become a very hard and durable solid that protects the decor paper. Release agents support the clean separation of the laminated board from the press plate. Press speed and quality of the surface is determined by the right choice of resin catalysts / hardener. All additives and catalysts are added to the resin right before the impregnation process.