| 摘要 |
The invention relates to a process for producing hard fibreboards by impregnating a comminuted wood fibre material with a binder mixture having a resin-solids content of approximately 50% and a viscosity of < 30 mPa.s. The resin is a non-tacky urea-formaldehyde resin with a solids content of 60 to 70% and a viscosity which, at 25 DEG C, is in the range from 150 to 300 mPa.s, and the proportion of free formaldehyde is < 1%. The dry, impregnated fibre material is then pressed conventionally.
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