Fire-retardant synthretic board product
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United States of America Patent
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-
Apr 6, 1993
Issued Date -
N/A
app pub date -
Nov 13, 1991
filing date -
Mar 20, 1989
priority date (Note) -
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Abstract
A method and apparatus for producing a synthetic board from cellulosic or lignocellulosic fibers is disclosed wherein a standard isocyanate binder is emulsified and immediately applied to the fibers before consolidation into a finished board product. The apparatus includes an emulsification and application nozzle comprising a diluent inlet, a binder inlet, a mixing section for emulsifying the diluent and the binder, and a spray nozzle for applying the binder/diluent emulsion to the fibers. The method includes supplying a binder stream, supplying a diluent stream, emulsifying the binder with the diluent and immediately applying the emulsion to the fibers. The method further includes flushing the binder/diluent emulsion using the diluent at the end of a binder application run to prevent curing of the emulsion and clogging of the apparatus. The binder/diluent emulsion can be applied to the fibers either in the blowline or downstream of the blowline, such as in the blender. A method and apparatus are also disclosed for producing fire-retardant boards in which a fire-retardant chemical, such as an ammonium polyphosphate, is applied to the fibers downstream of the refiner and upstream of the mat-former. Finally, a fire-retardant board product is disclosed that is made in accordance with the foregoing described methods and apparatuses.
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