Wet-end manufacturing process for bitumen-impregnated fiberboard
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United States of America Patent
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Oct 22, 2013
Grant Date -
May 30, 2013
app pub date -
Jan 23, 2013
filing date -
Aug 29, 2008
priority date (Note) -
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Abstract
A process for manufacturing fiberboard by preparing a fiber slurry mixture including containing cellulose fibers and water then atomizing a liquid bituminous material, such as asphalt. The liquid bituminous material is atomized by mixing it with a pressurized gas, such as compressed air, forming a mist comprising droplets of bituminous material having a diameter between 20 microns and 50 microns. A water spray solidifies the bituminous material droplets thereby forming bituminous particles which fall into the fiber slurry within the spray chamber. From there the slurry is sheared, dewatered, and dried, forming a finished fiberboard.
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