Patent ID: 8382952
Filing Date: 2013-02-26
Classification: C08L,D21H,D21J,E01C,Y10T

Abstract:
1. A bitumen-impregnated fiberboard or expansion joint made by the process comprising the steps of: preparing a fiber slurry mixture by adding a fibrous material to water and agitating the fiber slurry mixture; transferring the fiber slurry mixture to a spray chamber; heating a bituminous material to a temperature between 300° Fahrenheit and 400° Fahrenheit, wherein the bituminous material is in a liquid state; atomizing the liquid bituminous material within the spray chamber by mixing the liquid bituminous material with a pressurized gas, forming a mist comprising droplets of bituminous material having a diameter between approximately 20 microns to 50 microns; solidifying the bituminous material droplets within the spray chamber to form bituminous particles that mix with the fiber slurry in the spray chamber; adding a dye to the slurry; dewatering the slurry containing fibers and bituminous particles, leaving a wet mat containing fibers and bituminous particles; and drying the wet mat thereby forming the fiberboard or expansion joint.