Weyerhaeuser Company Limited

Weyerhaeuser Nr Company

Dwayne M Shearer

Amar N Neogi

Hugh West

David E Fish

Frank C Beall

Michael J Dougherty

Dwight A Dudley, Ii

Richard C Beetham

John M Rodgers

A co-extruded microlayered polymer barrier film is provided. The barrier film can be applied to paperboard to form a container having reduced oxygen gas permeability. Co-extrusion of the barrier film allows for the simultaneous fabrication of tens or hundreds of alternating microlayers of two different polymers that combine to form a film having reduced oxygen gas permeability compared to macro layer thickness films of the same two polymers.

Paperboard assembly with co extruded microlayered polymer barrier film

The barrier properties of a water soluble gas barrier material are improved if the material is blended with a nanoparticle calcium carbonate having a size of from 10 to 250 nanometers. The barrier material is on a substrate to provide a substrate with gas barrier properties. A layer of heat sealable material may be applied to the exposed surface of the barrier material. A method for making the barrier coated substrate is disclosed.

Barrier material

Method of making a barrier material

A multi-ply paperboard comprising at least one ply of conventional cellulose fibers and from about 0.1 to about 6 weight percent of a water-borne binding agent; and at least one ply containing up to 20% of chemically intra-fiber crosslinked cellulosic high-bulk fibers and from about 0.1 to about 6 weight percent of a water-borne binding agent. The water-borne binding agent may be a starch, a modified starch, a polyvinyl alcohol, a polyvinyl acetate, a polyethylene/acrylic acid copolymer, an acrylic acid polymer, a polyacrylate, a polyacrylamide, a polyamine, guar gum, an oxidized polyethylene, a polyvinyl chloride, a polyvinyl chloride/acrylic acid copolymer, an acrylonitrile/butadiene/styrene copolymer or polyacrylonitrile. A method for making the paperboard is disclosed.

Multi-ply cellulosic products using high-bulk cellulosic fibers

A fiber/binding agent composition comprising: individualized chemically crosslinked high-bulk fibers comprising individualized fibers chemically intra-fiber crosslinked with a crosslinking agent that is a polycarboxylic acid or is selected from the group of urea derivatives consisting of methylated urea, methylated cyclic ureas, methylated lower alkyl substituted ureas, dihydroxy cyclic ureas, and methylated dihydroxy cyclic ureas, and mixtures thereof; and from about 0.1 to about 6 weight percent of a water-borne binding agent. The water-borne binding agent is selected from the group consisting of starch, a polyvinyl alcohol, a polyvinyl acetate latex, a polyethylene/acrylic acid copolymer, an acrylic acid polymer, an oxidized polyethylene, a polyvinyl chloride, a polyvinyl chloride/acrylic acid copolymer, an acrylonitrile/butadiene/styrene copolymer and polyacrylonitrile.

Cellulosic products using high-bulk cellulosic fibers

The invention is a method for the on-line nondestructive determination of the internal bond strength of composite panel products. The method involves impinging an ultrasound pulse against the panel by a first transducer and receiving a transmitted pulse at a second transducer. The received signal strength, temperature and panel thickness are entered into an algorithm from which the internal bond may be calculated. Preferably the receiving transducer is located on the opposite side of the panel and displaced somewhat from the first transducer. The inclusion of temperature and panel thickness as independent variables greatly improves the accuracy over that available from uncorrected ultrasound testing.

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Seattle, WA, United States of America

Dwayne M Shearer