Glossary

Low pressure coating

refers to the direct application of mostly single-layer, maximum dual-layer, papers (film) impregnated with melamine resin. The resin impregnation melts at a pressure of 200-300 N/cm2 and a temperature of 180°C and bonds with the substrate. After cooling the synthetic resin hardens to a resistant film. This is referred to as low pressure coating or press coating as a relatively low pressure is used. The visual effect of the surface, that may vary depending on the type of the application plate and the duration of pressing, depends on the quality of the substrates used and/or the damping effect of the structure of the coating. While primer paper or putty is necessary as an interim layer with uneven surfaces in order to achieve optimum surface stability, the surface quality of the substrate is nowadays mainly achieved with single-layer films. Special processes allow the resin paper to be worked into a ready-coated sheet with the particle mat in one procedure. This process is called the one-press process or direct coating. In general, completed substrates are coated using the two-press process

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