Layer-by-layer nanocoating for paper fabrication

Details Layer-by-layer nanocoating for paper fabrication Layer-by-layer nanocoating for paper fabrication

2006-03-11

2010-11-30

Tucker, Philip C (Department: 1791)

Paper making and fiber liberation

Processes and products

Non-fiber additive

C162S164100, C162S164600, C162S166000, C162S168300, C162S174000, C162S181100, C162S181400, C162S181800, C162S182000

Reexamination Certificate

active

07842162

ABSTRACT:
A method is provided for manufacturing paper by means of layer-by-layer nanocoating techniques. The method comprises the sequential processing of an aqueous pulp of lignocellulose fibers which is first subjected to nanocoating by alternatively adsorbing onto the fibers multiple consecutively-applied layers of oppositely-charged nanoparticles, polymers and/or proteins thereby making a modified aqueous pulp of multi-layer nanocoated lignocellulose fibers, then draining the water out of the modified pulp to form sheets of multi-layer nanocoated fibers, and drying the formed sheets of multi-layer nanocoated fibers. The resulting dried sheets are then processed to make a finished paper that has superior physical strength and improved surface properties. In a preferred embodiment the starting aqueous pulp of lignocellulose fibers is divided into is separate portions which are separately nanocoated with opposite charges, and then blended to form a complex aggregate pulp of nanocoated fibers before draining and drying it. The method is particularly applicable to the treatment of broken (mill broke) recycled fibers in order to facilitate their usage in paper production.

REFERENCES:
Malin Eriksson, Shannon M. Notley, Lars Wagberg, The influence on paper strength properties when building multilayers of weak polyelectrolytes onto wood fibres, Journal of Colloid and Interface Science, 292(1) Dec. 1, 2005, pp. 38-45, (http://www.sciencedirect.com/science/article/B6WHR-4GHRC3D-3/2/fc8c53c5390d3ed026ec16a30d0a0ade).

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