Low-pressure veneers have been developed that are lower in production cost than high-pressure laminates with appropriate protection and decorative finishes. When a laminate is pressed, the resin impregnated paper is placed in a press together with the substrate.
The resin is polymerized directly on the surface of the substrate and a laminate is formed. The low lamination pressure used in the process avoids crushing of the substrate. The substrate commonly used in low pressure laminates includes a granulated sheet which has been sanded with 100 mesh grit and has a density of 650-680 kg/cm3. Also useful for medium density fiberboard and hardboard.
The covering material is mainly decorative paper impregnated with melamine. Some polyester-treated paper is also used. The decorative paper is made of dicellulose and has a basis weight ranging from 80 to 120 g/m2. They are impregnated to a resin content of from 56% to 59% (including 6% to 7% volatiles). Other papers used on the surface of low pressure laminates are saturated with a phenolic resin to a level of 35% to 45%. Such paper may be monochromatic or white, or may be a decorative paper such as impregnated with melamine. In the latter case the paper is usually coated with a nitrocellulose varnish or a polyacetal resin prior to lamination.
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