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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.
The cheapest industrial laminates (Class X) are used in large quantities where the dielectric properties are less important. It is made from unbleached kraft paper and about 30% phenolic resin. It has …
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