Patents Assigned to Rayonier Products and Financial Services Company
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Patent number: 7812153Abstract: A process for manufacturing xylose by extracting hemicellulose from a cellulosic material, such as by a cold caustic extraction method, concentrating the extract, such as by nanofiltration, into a hemicaustic stream containing hemicellulose with greater than about 85 wt % xylan content, and subsequently hydrolysing the xylan from the hemicaustic stream to xylose. The high concentration of xylan within the concentrated hemicaustic stream enables hydrolyzation of the xylan to food-grade xylose and, optionally, hydrogenation of the xylose to xylitol without the need of a chromatographic separation step as previously required.Type: GrantFiled: March 11, 2004Date of Patent: October 12, 2010Assignee: Rayonier Products and Financial Services CompanyInventors: Douglas R. Svenson, Jian Li
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Patent number: 7195695Abstract: The invention provides a method for preparing cross-linked cellulosic fibers. A sheet of cellulosic fibers treated with a caustic solution under non-mercerizing conditions is cross-linked with a solution containing polymeric polycarboxylic acid cross-linking agents. The treated cellulosic fibrous material is dried and cured in sheet form to promote intrafiber cross-linking. Cross-linked fiber products of this method, which is economic, that possess good absorption and wet resiliency properties are also disclosed.Type: GrantFiled: October 2, 2003Date of Patent: March 27, 2007Assignee: Rayonier Products & Financial Services CompanyInventors: Karl D. Sears, W. Jason Cooper, Tina R. Murguia
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Patent number: 7094318Abstract: The present invention relates to cross-linked cellulosic fiber having improved absorbency characteristics when compared to conventional cross-linked fibers. The cross-linked cellulosic fiber is obtainable by reacting pulp in the sheet or fluff form with one or more reagents selected from organic molecule having acid and aldehyde functional groups “acid aldehydes.” The invention also relates to a method of producing the cross-linked fiber. The method includes heating the treated cellulosic fibers to promote intrafiber cross-linking. The cross-linked fibers are characterized by having an improved centrifuge retention capacity, fluid acquisition rate, resiliency, absorbent capacity, absorbency under load, and other absorbent properties. The inventive cross-linked fibers are useful in forming absorbent composites, and in particular absorbent cores for use in absorbent articles.Type: GrantFiled: October 28, 2003Date of Patent: August 22, 2006Assignee: Rayonier Products and Financial Services CompanyInventors: Othman A. Hamed, Harry J. Chmielewski, Dana B. McBee
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Patent number: 7074301Abstract: The present invention relates to cross-linked cellulosic fiber having improved absorbency characteristics when compared to conventional cross-linked fibers. The cross-linked cellulosic fiber is obtainable by reacting pulp in the sheet or fluff form with one or more reagents selected from organic molecule having acid and aldehyde functional groups “acid aldehydes.” The invention also relates to a method of producing the cross-linked fiber. The method includes heating the treated cellulosic fibers to promote intrafiber cross-linking. The cross-linked fibers are characterized by having an improved centrifuge retention capacity, fluid acquisition rate, resiliency, absorbent capacity, absorbency under load, and other absorbent properties. The inventive cross-linked fibers are useful in forming absorbent composites, and in particular absorbent cores for use in absorbent articles.Type: GrantFiled: June 11, 2002Date of Patent: July 11, 2006Assignee: Rayonier Products and Financial Services CompanyInventors: Othman A. Hamed, Harry J. Chmielewski, Dana B. McBee
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Patent number: 7018511Abstract: The invention provides a method for preparing cross-linked cellulosic fibers. A sheet of mercerized cellulosic fibers with a purity of at least 95% is treated with a solution containing a carboxylic acid cross-linking agent. The treated cellulosic fibrous material is dried and cured in sheet form to promote intrafiber cross-linking. Cross-linked fiber products produced are economic and possess good porosity, bulking characteristics, wet resiliency, absorption characteristics, low fines, low nits and low knots. The invention also includes blended cellulose compositions comprising a minor proportion of cross-linked mercerized cellulosic fibers and a major proportion of other cellulosic fibers. The invention further provides individualized, chemically cross-linked mercerized cellulosic fibers of high purity.Type: GrantFiled: October 16, 2002Date of Patent: March 28, 2006Assignee: Rayonier Products & Financial Services CompanyInventors: Karl D. Sears, Michael E. Haeussler, Tina R. Solomon
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Patent number: 6913718Abstract: A method for formation of shaped components such as shaped absorbent cores, for disposable absorbent articles, contemplates that a relatively wide web of material be provided from which the components are cut. The web of material is longitudinally slit to form a plurality of subdivided webs each having shaped components arranged in serial relationship. The shaped components of adjacent ones of the subdivided webs are nested with each other, that is, a line extending longitudinally of the web extends through the components of adjacent subdivided webs. Efficient formation is facilitated by collecting the marginal portions of the web of material, and at least partially recycling the collected portions for formation of the wide web.Type: GrantFiled: November 5, 2001Date of Patent: July 5, 2005Assignee: Rayonier Products & Financial Services CompanyInventors: Paul Ducker, Rangachari Krishnakumar
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Patent number: 6896810Abstract: Systems and methods by which to subject cellulosic fibers to alkaline treatment are provided. The systems and methods of the invention include equipment, such as nanofiltration units and slurry concentrators, which result in a lowered overall consumption of alkaline solution during alkaline treatment. The systems and methods of the invention further allow the components of hemicaustic streams produced by such alkaline treatments to be utilized in higher value end uses.Type: GrantFiled: August 2, 2002Date of Patent: May 24, 2005Assignee: Rayonier Products and Financial Services CompanyInventors: Omar F. Ali, John T. Cenicola, Jian Li, Jay D. Taylor
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Patent number: 6855182Abstract: A pellet for use in conditioning soil made of a lignocellulose fiber matrix having up to 20% by weight of a soil conditioning material incorporated therein. The soil conditioning material comprises one or more synthetic soil conditioning polymers and, optionally, additional soil enhancing additives such as fertilizers, gypsum, and calcium salts. The preferred lignocellulose materials are pulp fibers with an alpha-cellulose purity of greater than about 75% by weight, with preferred lignin content of no higher than 10%. The soil conditioning polymers are preferably polyacrylamides (PAMs) or modified PAMs, but may be a combination of other soil conditioning polymers. The pellet is produced by dispersing the polymers into a bath of lignocellulose fibers. The dispersion is then formed into pellets with a pelletizing machine such that the polymer and other soil conditioning material is interspersed within the matrix formed by the pelletized lignocellulose.Type: GrantFiled: July 17, 2002Date of Patent: February 15, 2005Assignee: Rayonier Products and Financial Services CompanyInventor: Karl D. Sears
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Patent number: 6844066Abstract: The present invention relates to superabsorbent cellulose fiber including cellulose and at least one ethylenically unsaturated monomer. The invention also relates to a method of producing the superabsorbent fiber, and absorbent articles including the superabsorbent fiber.Type: GrantFiled: May 19, 2003Date of Patent: January 18, 2005Assignee: Rayonier Products and Financial Services CompanyInventor: Othman A. Hamed
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Publication number: 20040234760Abstract: The present invention relates to superabsorbent cellulose fiber including cellulose and at least one ethylenically unsaturated monomer. The invention also relates to a method of producing the superabsorbent fiber, and absorbent articles including the superabsorbent fiber.Type: ApplicationFiled: May 19, 2003Publication date: November 25, 2004Applicant: Rayonier Products and Financial Services CompanyInventor: Othman A. Hamed
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Publication number: 20040159413Abstract: Systems and processes are provided for the treatment of cellulosic pulp rolls. Generally, the systems and processes apply a series of compositions, such as debonding compositions, binder compositions and lubricant compositions, to cellulosic fiber webs provided on pulp rolls. The systems and processes provide a cost effective means by which to form cellulosic fiber pellets which may then be incorporated into a variety of end uses.Type: ApplicationFiled: February 3, 2003Publication date: August 19, 2004Applicant: Rayonier Products and Financial Services CompanyInventors: Jay Taylor, Brian Herrin
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Publication number: 20040140592Abstract: The present invention provides composites prepared from melt blending compositions that generally include cellulosic pulp fibers having an alpha-cellulose purity of greater than 80% by weight, at least one water soluble binder, at least one lubricant, at least one compatibilizer, and at least one matrix polymer. The present invention further provides advantageous temperature profiles and feeding arrangements to be used in conjunction with the melt blending of such composites. The composites of the present invention exhibit reduced discoloration and improved fiber dispersion.Type: ApplicationFiled: January 6, 2004Publication date: July 22, 2004Applicant: Rayonier Products and Financial Services CompanyInventors: Fred Barlow, Yash Khanna, Daren B. Pietsch, John Underwood
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Patent number: 6743507Abstract: The present invention provides composites prepared from melt blending compositions that generally include cellulosic pulp fibers having an alpha-cellulose purity of greater than 80% by weight, at least one water soluble binder, at least one lubricant, at least one compatibilizer, and at least one matrix polymer. The present invention further provides advantageous temperature profiles and feeding arrangements to be used in conjunction with the melt blending of such composites. The composites of the present invention exhibit reduced discoloration and improved fiber dispersion.Type: GrantFiled: June 7, 2002Date of Patent: June 1, 2004Assignee: Rayonier Products and Financial Services CompanyInventors: Fred Barlow, Yash Khanna, Daren B. Pietsch, John Underwood
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Publication number: 20030195485Abstract: Multilayered absorbent cores are provided that include synthetic fiber to improve the liquid transport properties of the resulting absorbent articles. The synthetic fiber, which may be found in either the innermost and/or intermediate layers of the absorbent core, particularly improve the rewet performance of the absorbent article. The absorbent cores may be incorporated into a number of absorbent articles, including diapers, feminine hygiene products and incontinence pads.Type: ApplicationFiled: April 10, 2003Publication date: October 16, 2003Applicant: Rayonier Products and Financial Services CompanyInventors: Krishnakumar Rangachari, Paul M. Ducker
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Patent number: 6485667Abstract: A process is provided for making an absorbent material. A web is formed with at least one layer of a mixture of cellulosic fibers and superabsorbent material. The moisture content of the web is increased so as to increase the web density. Then, the web is compacted at an elevated temperature to further increase the web density and to effect hydrogen bonding within the web.Type: GrantFiled: September 3, 1999Date of Patent: November 26, 2002Assignee: Rayonier Products and Financial Services CompanyInventor: Erol Tan
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Patent number: 6310268Abstract: Soft wood pulp sheets, soft absorbent cores, and methods for making the soft wood pulp sheets or soft absorbent cores by addition of non-ionic plasticizers before, during or after the pulp or core manufacturing process are disclosed. Preferred non-ionic plasticizers are ethers or esters such as triacetin, citrates or glycol derivatives.Type: GrantFiled: August 21, 2000Date of Patent: October 30, 2001Assignee: Rayonier Products and Financial Services CompanyInventors: Krishnakumar Rangachari, Kays Chinai