| 摘要 |
Preparation of wood fiber insulating boards by comminution and drying of hogged chips to 4-8% moisture, mixing of the wood fibers with reactive isocyanate binder, compression of the fiber matting to a thickness of bulk density 60-80 kg/m3, introduction of steam or a stem/air mixture into the fiber matting to completely cure the compressed binder, giving an end product of about 12% equilibrium moisture content, is new. A process for preparation of wood fiber insulating boards by:(a) comminution and drying of hogged chips in a refiner, (b) drying of any moist chips from the refiner to a moisture content of 4-8%, (c) mixing of the wood fibers after drying with reactive isocyanate binder in a mixer or by pneumatic transport, (d) mechanical scattering of the fiber/binder mixture on an air permeable shaped band (sic) to give a matting, (e) transfer of the fiber matting to a wire cloth and compressing to the desired board thickness of bulk density 40-200, preferably 60-80 kg/m3, (f) introduction of steam or a stem/air mixture into the fiber matting, with adjustment of the temperature and moisture content so that the binder is completely cured during maintenance of the compressed state, and the compressed fiber material or board end product has an equilibrium moisture content of about 12%. |
