Method for applying chemical additives to pulp during the pulp processing and products made by said method
First Claim
1. A method for applying a chemical additive to pulp fiber, said method comprising:
- a) creating a fiber slurry comprising process water and pulp fibers;
b) transporting said fiber slurry to a web-forming apparatus of a pulp sheet machine and forming a wet fibrous web;
c) dewatering said wet fibrous web to a predetermined consistency thereby forming a dewatered fibrous web;
d) applying a first chemical additive to said dewatered fibrous web thereby forming a chemically treated dewatered fibrous web of chemically treated pulp fibers;
e) applying a second chemical additive to said chemically treated dewatered fibrous web;
f) drying said chemically treated dewatered fibrous web to a predetermined consistency thereby forming a chemically treated dried fibrous; and
g) dispersing the chemically treated pulp fibers of the chemically treated dried fibrous web in water and draining the water from the chemically treated pulp fibers, wherein said chemically treated pulp fibers retain from between about 10 to about 100 percent of the applied amount of said first and second chemical additives.
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Abstract
Pulp fibers can be treated with chemical additives with a minimal amount of unretained chemical additives present later in the process water. The present invention is a method for preparing chemically treated pulp fiber. A fiber slurry is created comprising process water and pulp fibers. The fiber slurry is transported to a web-forming apparatus of a pulp sheet machine thereby forming a wet fibrous web. The wet fibrous web is dried to a predetermined consistency thereby forming a dried fibrous web. The dried fibrous web is treated with a chemical additive thereby forming a chemically treated dried fibrous web. The dried fibrous web contains chemically treated pulp fibers. The chemically treated pulp fibers retain from between about 10 to about 100 percent of the applied amount of the chemical additive when the chemically treated pulp fibers are redispersed in water.
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Citations
22 Claims
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1. A method for applying a chemical additive to pulp fiber, said method comprising:
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a) creating a fiber slurry comprising process water and pulp fibers; b) transporting said fiber slurry to a web-forming apparatus of a pulp sheet machine and forming a wet fibrous web; c) dewatering said wet fibrous web to a predetermined consistency thereby forming a dewatered fibrous web; d) applying a first chemical additive to said dewatered fibrous web thereby forming a chemically treated dewatered fibrous web of chemically treated pulp fibers; e) applying a second chemical additive to said chemically treated dewatered fibrous web; f) drying said chemically treated dewatered fibrous web to a predetermined consistency thereby forming a chemically treated dried fibrous; and g) dispersing the chemically treated pulp fibers of the chemically treated dried fibrous web in water and draining the water from the chemically treated pulp fibers, wherein said chemically treated pulp fibers retain from between about 10 to about 100 percent of the applied amount of said first and second chemical additives. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for applying chemical additives to pulp fiber, said method comprising:
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a) mixing pulp fibers with process water to form a fiber slurry; b) transporting said fiber slurry to a web-forming apparatus of a pulp sheet machine and forming a wet fibrous web; c) dewatering said wet fibrous web to a predetermined consistency thereby forming a dewatered fibrous web;
d) applying a first chemical additive to said dewatered fibrous web thereby forming a chemically treated dewatered fibrous web; e) drying said chemically treated dewatered fibrous web to a predetermined consistency thereby forming a dried fibrous web; f) applying a second chemical additive to said dried fibrous web thereby forming a chemically treated dried fibrous web containing chemically treated pulp fibers; and g) dispersing the chemically treated pulp fibers of the chemically treated dried fibrous web in water and draining the water from the chemically treated pulp fibers, wherein said chemically treated pulp fibers retain from between about 10 to about 100 percent of the applied amount of said first and second chemical additives. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification