Fiberboard manufactured with cellulose nanofibrils as a binder and method of making same
AssigneeW.R. Meadows, Inc.
InventorMark W. Custer
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Abstract
Fiberboard sheet materials containing cellulosic fibers ae disclosed in which cellulose nanofibrils are used as a binder for adhering the cellulosic fibers together. The cellulose nanofibrils are present in an amount of 0.5% to 7.5% by weight on a dry weight basis of the fiberboard sheet. The fiberboard sheet materials have strength properties that meet or exceed the requirements in ASTM C208, and are useful for structural sheathing and roofing board applications. A process for manufacturing the fiberboard sheet is also disclosed.
Claims20
A fiberboard sheet comprising:
- (a) cellulosic fibers in an amount of 81.0-99.0% by weight on a dry weight basis of the fiberboard sheet;
- (b) a binder comprising cellulose nanofibrils, wherein the cellulose nanofibrils have a fiber diameter in the range of 0.01 to 0.3 micrometers, and are present in the fiberboard sheet in an amount of about 0.5% to about 7.5% by weight, on a dry weight basis of the fiberboard sheet.
A fiberboard material comprising:
- (a) cellulosic fibers in an amount of 81.0-99.0% by dry weight,
- (b) a binder comprising cellulose nanofibrils, wherein the cellulose nanofibrils have a fiber diameter in the range of 0.01 to 0.3 micrometers and are present in an amount of about 0.5% to about 7.5% by weight based on dry weight of the cellulosic fibers and cellulose nanofibrils;
- and
- (c) water.
A process for manufacturing fiberboard comprising the steps of:
- (a) preparing a fiber slurry comprising cellulosic fibers and water;
- (b) adding cellulose nanofibrils having a fiber diameter in the range of about 0.01 to about 0.3 micrometers to the fiber slurry in an amount of about 0.5% to about 7.5% by weight based on dry weight of the cellulosic fibers and cellulose nanofibrils;
- (c) dewatering the fiber slurry to form a wet mat comprising the cellulosic fibers and cellulose nanofibrils;
- and
- (d) drying the wet mat to thereby form the fiberboard.
Dependencies are inferred from the claim text.