Hot Springs, AK, United States
Hot Springs, AK, United States

Weyerhaeuser is one of the world's largest private owners of timberlands. It owns or controls more than 6 million acres of timberlands, primarily in the U.S., and manages another 14 million acres under long-term licenses in Canada. The company also manufactures wood and cellulose fiber products. Weyerhaeuser is a real estate investment trust. Wikipedia.


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Patent
Weyerhaeuser Company | Date: 2016-08-03

Wood-based composites, and methods for their manufacture, are provided. The composites include oriented wooden strands and cured bonding resin connecting adjacent strands. The composites are relatively low-density, having an average dry density of the wooden composites of about 15-28 pounds per cubic foot (pcf). The unique composition of the composites provide improved structural and insulating (thermal and acoustic) properties when compared to traditional engineered wood products (e.g., oriented strandboard).


Patent
Weyerhaeuser Company | Date: 2016-11-18

Grafted, crosslinked cellulosic materials include cellulose fibers and polymer chains composed of at least one monoethylenically unsaturated acid group-containing monomer (such as acrylic acid) grafted thereto, in which one or more of said cellulose fibers and said polymer chains are crosslinked (such as by intra-fiber chain-to-chain crosslinks). Some of such materials are characterized by a wet bulk of about 10.0-17.0 cm^(3)/g, an IPRP value of about 1000 to 7700 cm^(2)/MPasec, and/or a MAP value of about 7.0 to 38 cm H_(2)O. Methods for producing such materials may include grafting polymer chains from a cellulosic substrate, followed by treating the grafted material with a crosslinking agent adapted to effect crosslinking of one or more of the cellulosic substrate or the polymer chains. Example crosslinking mechanisms include esterfication reactions, ionic reactions, and radical reactions, and example crosslinking agents include pentaerythritol, homopolymers of the graft species monomer, and hyperbranched polymers.


Patent
Weyerhaeuser Company | Date: 2015-09-23

A building product having improved fire resistance by virtue of solid fire-resistant cladding material attached to at least a portion of one or more surfaces of the building product. The solid fire-resistant cladding material includes wood fiber and binder. The building product can be a wood-based building product, and can be in the form of an I-joist. When an I-joist is used, the solid fire-resistant cladding material can be attached to, for example, the web of the I-joist.


Patent
Weyerhaeuser Company | Date: 2017-01-25

Grafted, crosslinked cellulosic materials include cellulose fibers and polymer chains composed of at least one monoethylenically unsaturated acid group-containing monomer (such as acrylic acid) grafted thereto, in which one or more of said cellulose fibers and said polymer chains are crosslinked (such as by intra-fiber chain-to-chain crosslinks). Some of such materials are characterized by a wet bulk of about 10.0-17.0 cm^(3)/g, an IPRP value of about 1000 to 7700 cm^(2)/MPasec, and/or a MAP value of about 7.0 to 38 cm H_(2)O. Methods for producing such materials may include grafting polymer chains from a cellulosic substrate, followed by treating the grafted material with a crosslinking agent adapted to effect crosslinking of one or more of the cellulosic substrate or the polymer chains. Example crosslinking mechanisms include esterfication reactions, ionic reactions, and radical reactions, and example crosslinking agents include pentaerythritol, homopolymers of the graft species monomer, and hyperbranched polymers.


Patent
Weyerhaeuser Company | Date: 2015-07-24

Grafted, crosslinked cellulosic materials include cellulose fibers and polymer chains composed of at least one monoethylenically unsaturated acid group-containing monomer (such as acrylic acid) grafted thereto, in which one or more of said cellulose fibers and said polymer chains are crosslinked (such as by intra-fiber chain-to-chain crosslinks). Some of such materials are characterized by a wet bulk of about 10.0-17.0 cm^(3)/g, an IPRP value of about 1000 to 7700 cm^(2)/MPasec, and/or a MAP value of about 7.0 to 38 cm H_(2)O. Methods for producing such materials may include grafting polymer chains from a cellulosic substrate, followed by treating the grafted material with a crosslinking agent adapted to effect crosslinking of one or more of the cellulosic substrate or the polymer chains. Example crosslinking mechanisms include esterfication reactions, ionic reactions, and radical reactions, and example crosslinking agents include pentaerythritol, homopolymers of the graft species monomer, and hyperbranched polymers.


Patent
Weyerhaeuser Company | Date: 2016-06-27

A tree harvesting system includes a loader and a delimber. A camera system mounted on the delimber permits an operator to view an interaction area between a delimbing saw or toping saw and the tree being cut while the operator remains safely in a cab of the loader. The camera system provides image data to a display system located in the cab of the loader, and the image data may be viewed and/or processed to provide information about the interaction area, physical data about the tree, or some combination thereof. Advantageously, the tree harvesting system may allow for more accurate saw cuts at a preferred location of the tree, which in turn may result in a higher dollar amount and more efficient distribution of sticks to the mills.


Patent
Weyerhaeuser Company | Date: 2016-01-06

A method for developing conifer cotyledonary somatic embryos is described. The method includes culturing conifer pre-cotyledonary somatic embryos in, or on, a development medium at a temperature from about 20 C. to about 22 C. for a first incubation period sufficient in length for at least a portion of the pre-cotyledonary somatic embryos to develop into cotyledonary somatic embryos, and culturing the cotyledonary somatic embryos in, or on, the development medium at a temperature from about 10 C. to about 15 C. for a second incubation period sufficient in length for at least a portion of the cotyledonary somatic embryos to reach anatomical maturity.


Patent
Weyerhaeuser Company | Date: 2016-03-22

A composition comprising 10 to 50 weight % wood pulp fiber, 45 to 85 weight % thermoplastic polymer and 0.1 to 5 weight % clear mineral oil having a specific gravity less than water. A composition comprising 65 to 85 wt % wood pulp fiber, 15 to 35 wt % thermoplastic polymer and 0.1 to 5 weight % mineral oil having a specific gravity less than water. The wood pulp fiber can be bleached chemical wood pulp fiber.


A composite wood product in accordance with a particular embodiment of the present technology includes a composite substrate and a sealant disposed within a surface portion of the substrate. The substrate includes wood and a binder. The sealant includes photoresponsive molecules present within the surface portion of the substrate at an average concentration greater than 1000 parts per million. In response to a 120-day exposure at 7 inches separation distance to a UV lamp with a UVA (315-400 nm) output of 13.6 W and a UVB (280-315 nm) output of 3.0 W, a CIELab b* value of the substrate decreases by a first amount, a CIELab b* value of the sealant increases by a second amount, and a CIELab b* value of the overall wood product decreases by an amount less than the first amount, increases by an amount less than the second amount, or is unchanged.


Patent
Weyerhaeuser Company | Date: 2016-08-31

Methods of forming crosslinked cellulose include mixing a crosslinking agent with an aqueous mixture of cellulose fibers containing little to no excess water (e.g., solids content of 25-55%), drying the resulting mixture to 85-100% solids, then curing the dried mixture to crosslink the cellulose fibers. Systems include a mixing unit to form, from an aqueous mixture of unbonded cellulose fibers having a solids content of about 25-55% and a crosslinking agent, a substantially homogenous mixture of non-crosslinked, unbonded cellulose fibers and crosslinking agent; a drying unit to dry the substantially homogenous mixture to a consistency of 85-100%; and a curing unit and to cure the crosslinking agent to form dried and cured crosslinked cellulose fibers. Intrafiber crosslinked cellulose pulp fibers produced by such methods and/or systems have a chemical on pulp level of about 2-14% and an AFAQ capacity of at least 12.0 g/g.

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