US20090165969A1 - Enzymatic treatment of pulp for lyocell manufacture - Google Patents

Enzymatic treatment of pulp for lyocell manufacture Download PDF

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Publication number
US20090165969A1
US20090165969A1 US11/967,820 US96782007A US2009165969A1 US 20090165969 A1 US20090165969 A1 US 20090165969A1 US 96782007 A US96782007 A US 96782007A US 2009165969 A1 US2009165969 A1 US 2009165969A1
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Prior art keywords
pulp
enzyme
stage
sample
solution
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Abandoned
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US11/967,820
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English (en)
Inventor
Mengkui Luo
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Weyerhaeuser NR Co
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Weyerhaeuser Co
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Priority to US11/967,820 priority Critical patent/US20090165969A1/en
Priority to PCT/US2008/086367 priority patent/WO2009088635A2/en
Priority to ARP080105662A priority patent/AR069928A1/es
Priority to CL2008003884A priority patent/CL2008003884A1/es
Assigned to WEYERHAEUSER NR COMPANY reassignment WEYERHAEUSER NR COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEYERHAEUSER COMPANY
Publication of US20090165969A1 publication Critical patent/US20090165969A1/en
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/40—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using enzymes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides

Definitions

  • This application relates to the reduction in the degree of polymerization (DP) of cellulose with enzymes to provide a pulp with acceptable metals levels suitable for lyocell manufacture.
  • DP degree of polymerization
  • FIG. 1 is a 1 K magnification of a lyocell fiber spun from the low DP pulp in this application.
  • Enzymes are used in the treatment of cellulosic pulp to improve the bleaching and to reduce the DP of the pulp.
  • One use of enzymes is to control the viscosity of the pulp during the bleach treatment.
  • a low uniform viscosity is needed for dissolving and non dissolving pulps useful for rayon or lyocell production. Enzymes may be used to control this viscosity.
  • Enzymes that are useful with cellulose include xylanases, cellulases, hemicellulases, peroxidases, mannases, laccases (oxidoreductases), lipases and combinations of these enzymes.
  • the cellulose pulp must be at the correct pH in order for the enzymes to work.
  • the usual pH is 3 to 10.
  • An acids such as sulfuric, nitric or hydrochloric acid, is usually used to adjust to the appropriate pH but there are problems associated with the use of these mineral acids.
  • the mineral acids tend to harden the outside of the cellulose fibers and reduce the void volume within cellulose pulp fibers thus make it more difficult for the enzymes to interact with the cellulose pulp fibers.
  • Mineral acids are applied as a liquid and the dispersion of the acid through the pulp can be non-uniform.
  • Carbon dioxide can be used to adjust the pH of the cellulose pulp fiber to the correct pH of 2 to 7.5 and does not create the problems that the use of mineral acids do.
  • the carbon dioxide tends to maintain the openness of the cellulose pulp fiber or biomass and allow better interaction of the enzyme with both the outside and the inside of the cellulose pulp fiber or biomass.
  • the carbon dioxide is applied as a gas and tends to disperse more uniformly throughout.
  • Other organic acids such as acetic acid can also be used.
  • Various bleaching sequences can be used to make non dissolving pulp for lyocell. It is important that during the bleaching sequence that copper levels and total transition metals be kept low since this element adversely affects the NMMO which is used to dissolve the cellulose.
  • lyocell pulps with a low DP and suitable for lyocell production can be produced by the use of enzymes after oxygen delignification (before bleaching), intermediate in the bleaching sequence or alternatively at the end of the bleaching sequence.
  • the bleaching sequence is OXDE p D where O is oxygen delignification stage, X is the enzyme treatment stage, D is the chlorine dioxide stage, E p is the caustic extraction stage in the presence of peroxide and D is the bleaching stage with chlorine dioxide.
  • the bleaching sequence is ODE p DX where O is oxygen delignification, D is bleaching with chlorine dioxide, E p is caustic extraction in the presence of peroxide, D is chlorine dioxide bleaching and X is enzyme treatment.
  • the bleaching sequence is OXDE p DX where O is oxygen delignification X is enzyme treatment, D is bleaching with chlorine dioxide, E p is caustic extraction in the presence of peroxide, D is chlorine dioxide bleaching and X is enzyme treatment.
  • OXDE p D oxygen delignification X
  • D bleaching with chlorine dioxide
  • E p caustic extraction in the presence of peroxide
  • D chlorine dioxide bleaching
  • X enzyme treatment.
  • Treatment of an unbleached kraft pulp with an IV of 6.2 and a Kappa of 28 to 30 using one of these bleach sequences, for example OXDE p D can reduce the pulp to an acceptable D. P. range, and the pulp has an acceptable copper number and acceptable total transition metals levels.
  • Unbleached pulp with an IV (intrinsic viscosity) from 10 to 5 dl/g can be contacted in a bleaching sequence with at least one stage of an enzyme treatment and reduce the pulp by 8 to 2 units.
  • the enzyme treatment can also occur after the bleach sequence or alternatively the enzyme treatment can be in the bleaching sequence and after the bleach sequence.
  • the pulp is reduced to 2 to 4 IV units; in another embodiment the pulp is reduced to 2.5 to 3.5 units.
  • the enzyme is added at 0.045 to 4.5 kg/MT pulp. In another embodiment the enzyme is added at 0.136 g to 3.27 kg/MT pulp In yet another embodiment the enzyme is added at 0.227 g to 1.36 kg/MT pulp.
  • degree of polymerization refers to the number of D-glucose monomers in a cellulose molecule.
  • average degree of polymerization refers to the average number of D-glucose molecules per cellulose polymer in a population of cellulose polymers.
  • DP and IV were determined by ASTM 1795-96.
  • Pulp with a Kappa of 28 to 30 from the normal Kraft process underwent an oxygen stage delignification with H 2 O 2 and sodium extraction at 121° C. (250° F.) to obtain unbleached pulp with an IV of 6.2 dl/g ( Falling Ball or FB of 86).
  • This pulp was washed (POW, post oxygen washer) and the POW 3 rd stage wash had an initial set point of 68° C. and stock exit pH of about 7 (CO2 adjusted), the pulp with the adjusted pH was treated with cellulase Biotouch C700 from Ashland Inc.
  • pulp with an IV of 6.2 dl/g is treated with an enzyme after the oxygen delignification stage followed by a chlorine dioxide (D), caustic extraction with peroxide (Ep), and then a chlorine dioxide stage.
  • pulp with an IV of 6.2 dl/g is treated with an enzyme after the oxygen delignification stage followed by a chlorine dioxide (D) stage, caustic extraction with peroxide (Ep), a chlorine dioxide stage and another enzyme stage, X, after bleaching.
  • cellulase treatment after bleaching can reduce viscosity; for example, at 0.9 kg/MT pulp the IV levels were reduced from 3.2 to 2.7 dl/g. High levels of enzyme have an adverse effect on copper number and increase it to unacceptable levels.
  • R 10 refers to the residual undissolved material that is left after attempting to dissolve the pulp in a 10% caustic solution.
  • R 18 refers to the residual amount of undissolved material left after attempting to dissolve the pulp in an 18% caustic solution.
  • hemicellulose and chemically degraded short chain cellulose are dissolved and removed in solution.
  • generally only hemicellulose is dissolved and removed in an 18% caustic solution.
  • the difference between the R 10 value and the R 18 value represents the amount of chemically degraded short chained cellulose that is present in the pulp sample.
  • Providing a pulp having a relatively broad molecular weight distribution of at least equal to or greater than about 2.8 is desirable from the standpoint of being able to provide customers with pulp which may not require blending with pulps of other molecular weight distribution to arrive at the desired composition.
  • Sugar analysis was determined by the method described below.
  • the low DP pulp (trial) had lower viscosity at all shear rates compared with Peach® (control). This indicates that higher throughput (higher concentration at the same viscosity or higher throughput per hole per minute) for meltblowing is possible with lower DP pulp due to lower solution viscosity.
  • Cellulase treatment can lower pulp viscosity.
  • the treated pulp has acceptable copper number and metal content for the lyocell process.
  • Certain surfactants also help cellulase treatment.
  • Treated pulp can have similar hemicellulose as a control (Peach®) pulp implying minimal yield loss.
  • the lower DP pulp has lower solution viscosity in NMMO, thus it is possible to use lower DP pulp at higher throughput (higher concentration or higher thoughtput per hole per minute during lyocell production) to improve economics for lyocell production.
  • Kamloops never dried pulp with a bleaching sequence of DEDED with a intrinsic viscosity of 3.7 or FB viscosity of 22 was treated with 0.91 kg MT of Biotouch C-700 at the same condition as listed in Table 1 and the treated pulp had intrinsic viscosity (IV) of 3.4 dl/g or FB of 19 and a copper number of 0.9.
  • Weyerhaeuser Flint River Peach® (never dried) with an IV of 3.2 (OXDEpD) was treated with another Ep stage (2.0% NaOH, 3% H 2 O 2 , at 10% consistency, at 88° C. for 90 minutes).
  • the treated sample has an IV viscosity of 2.6 and a copper number of 0.8.
  • Part of the same sample from above treatment was dried and then treated with Biotouch C-700 again (same condition as sample 1 in Table 1) to obtain a sample with an IV of 2.5 and copper number of 0.8.
  • Part of the same sample above from the Ep stage was not dried and then treated with C-700 (same condition as sample 1 in Table 1) again to obtain another samples having IV of 2.5 and copper number of 0.8.
  • Peach® a never dried bleached kraft southern pine pulp, available from Weyerhaeuser, Federal Way, Wash., was treated with cellulase (1% Ashland Biotouch 700) on air dry pulp weight with the same condition as sample 1 in Table 1) to yield a pulp having an average degree of polymerization of about 500 (IV of 2.63), a hemicellulose content of 12.0% by weight hemicellulose in pulp (6.8% and 5.3% by weight xylan and mannan, respectively) and an R 10 and R 18 , of about 76.6 and 84.5, respectively.
  • the pulp was dissolved in NMMO (N-methyl morpholine N-oxide)/water mixture as follows.
  • a 250 mL three necked flask was charged with, for example, 66.4 g of 97% NMMO, 24.7 g of 50% NMMO, 10.4 g pulp, 0.1 g of propyl gallate.
  • the flask was immersed in an oil bath at 105° C., a stirrer inserted and stirring continued for about 1 hr.
  • a readily flowable dope resulted that was suitable for spinning.
  • the cellulose concentration in the dope was about 12% by weight.
  • the dope was extruded from a melt blowing die that had 3 nozzles having an orifice diameter of 457 microns at a rate of 1.0 gram/hole/minute.
  • the orifices had a length/diameter ratio of 5.
  • the nozzle was maintained at a temperature of 95° C.
  • the dope was extruded into an air gap 30 cm long before coagulation in water and collected on a screen as either continuous or discontinuous filaments depending on dope rheology and meltblown conditions.
  • Air at a temperature of 95° C. and a pressure of about 10 psi, was supplied to the head. Air pressures of from 8 to 30 psi were used to achieve varying fibers diameters shown in Table 8.
  • FIG. 1 shows a longitudinal section of the fiber and indicates the fiber spun from a low DP pulp has a smooth surface.
  • This method is applicable for the preparation and analysis of pulp and wood samples for the determination of the amounts of the following pulp sugars: fucose, arabinose, galactose, rhamnose, glucose, xylose and mannose using high performance anion exchange chromatography and pulsed amperometric detection (HPAEC/PAD).
  • pulp sugars fucose, arabinose, galactose, rhamnose, glucose, xylose and mannose using high performance anion exchange chromatography and pulsed amperometric detection (HPAEC/PAD).
  • Polymers of pulp sugars are converted to monomers by hydrolysis using sulfuric acid. Samples are ground, weighed, hydrolyzed, diluted to 200-mL final volume, filtered, diluted again (1.0 mL+8.0 mL H 2 O) in preparation for analysis by HPAEC/PAD.
  • Fucose is used for the kraft and dissolving pulp samples.
  • 2-Deoxy-D-glucose is used for the wood pulp samples.
  • Fucose internal standard. 12.00 ⁇ 0.005 g of Fucose, Sigma Cat. No. F 2252, [2438-80-4], is dissolved in 200.0 mL H 2 O giving a concentration of 60.00 ⁇ 0.005 mg/mL. This standard is stored in the refrigerator.
  • Solvent A is distilled and deionized water (18 meg-ohm), sparged with helium while stirring for a minimum of 20 minutes, before installing under a blanket of helium, which is to be maintained regardless of whether the system is on or off.
  • Solvent B is 400 mM NaOH. Fill Solvent B bottle to mark with water and sparge with helium while stirring for 20 minutes. Add appropriate amount of 50% NaOH.
  • Solvent D is 200 mM sodium acetate. Using 18 meg-ohm water, add approximately 450 mL deionized water to the Dionex sodium acetate container. Replace the top and shake until the contents are completely dissolved. Transfer the sodium acetate solution to a 1-L volumetric flask. Rinse the 500-mL sodium acetate container with approximately 100 mL water, transferring the rinse water into the volumetric flask. Repeat rinse twice. After the rinse, fill the contents of the volumetric flask to the 1-L mark with water. Thoroughly mix the eluent solution. Measure 360 ⁇ 10 mL into a 2-L graduated cylinder. Bring to 1800 ⁇ 10 mL. Filter this into a 2000-mL sidearm flask using the Millipore filtration apparatus with a 0.45 pm, Type HA membrane. Add this to the solvent D bottle and sparge with helium while stirring for 20 minutes.
  • the post column addition solvent is 300 mM NaOH. This is added postcolumn to enable the detection of sugars as anions at pH >12.3. Transfer 15 ⁇ 0.5 mL of 50% NaOH to a graduated cylinder and bring to 960 ⁇ 10 mL in water.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
US11/967,820 2007-12-31 2007-12-31 Enzymatic treatment of pulp for lyocell manufacture Abandoned US20090165969A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US11/967,820 US20090165969A1 (en) 2007-12-31 2007-12-31 Enzymatic treatment of pulp for lyocell manufacture
PCT/US2008/086367 WO2009088635A2 (en) 2007-12-31 2008-12-11 Enzymatic treatment of pulp for lyocell manufacture
ARP080105662A AR069928A1 (es) 2007-12-31 2008-12-22 Tratamiento enzimatico de pulpa para fabricacion de lyocell
CL2008003884A CL2008003884A1 (es) 2007-12-31 2008-12-23 Metodo para elaborar una pulpa de lyocell que comprende proporcionar una pulpa sin blanquear con una viscocidad intrinseca (iv) entre 10 y 5 dl/g, poner en contacto dicha pulpa en una secuencia de blanqueo que tiene al menos una etapa de tratamiento de enzima, que reduce la iv de la pulpa en el rango de 2 a 8 unidades.

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US20110156299A1 (en) * 2009-12-31 2011-06-30 Acelon Chemical And Fiber Corporation Meltblown wetlaid method for producing non-woven fabrics with anti-mildew, anti-bacteria and deodorizing capabilities from natural cellulose
US20110154627A1 (en) * 2009-12-31 2011-06-30 Acelon Chemical And Fiber Corporation Meltblown wetlaid method for producing non-woven fabrics from natural cellulose
US20110156303A1 (en) * 2009-12-31 2011-06-30 Acelon Chemical And Fiber Corporation Spunbond wetlaid method for producing non-woven fabrics from natural cellulose
CN102127840A (zh) * 2010-01-13 2011-07-20 聚隆纤维股份有限公司 使用湿式纺黏方式制备天然纤维素不织布的方法
CN102127842A (zh) * 2010-01-13 2011-07-20 聚隆纤维股份有限公司 使用湿式熔喷方式制备天然纤维素不织布的方法
US20120241669A1 (en) * 2009-09-30 2012-09-27 Shanghai Lyocell Fibre Development Co., Ltd. Solvent Spun Bamboo Fiber with High Wet Modulus and Producing Method Thereof
WO2014161018A1 (de) * 2013-04-05 2014-10-09 Lenzing Ag Polysaccharidfaser mit erhöhtem fibrillationsvermögen und verfahren zu ihrer herstellung
US8882876B2 (en) 2012-06-20 2014-11-11 Hollingsworth & Vose Company Fiber webs including synthetic fibers
US9027765B2 (en) 2010-12-17 2015-05-12 Hollingsworth & Vose Company Filter media with fibrillated fibers
US9352267B2 (en) 2012-06-20 2016-05-31 Hollingsworth & Vose Company Absorbent and/or adsorptive filter media
US9511330B2 (en) 2012-06-20 2016-12-06 Hollingsworth & Vose Company Fibrillated fibers for liquid filtration media
US9701800B2 (en) 2013-04-10 2017-07-11 Lenzing Aktiengesellschaft Polysaccharide film and method for the production thereof
WO2017155487A1 (en) * 2016-03-07 2017-09-14 Veritas Tekstil Konfeksiyon Pazarlama Ve Sanayi Ticaret Anonim Sirketi Water-soluble regenerated fiber production from calluna vulgaris plant species
US10137392B2 (en) 2012-12-14 2018-11-27 Hollingsworth & Vose Company Fiber webs coated with fiber-containing resins
US10196758B2 (en) 2013-06-18 2019-02-05 Lenzing Aktiengesellschaft Polysaccharide fibers and method for producing same
US10221502B2 (en) 2013-04-05 2019-03-05 Lenzing Aktiengesellschaft Polysaccharide fibers and method for the production thereof
US10220111B2 (en) 2013-06-17 2019-03-05 Lenzing Aktiengesellschaft Highly absorbent polysaccharide fiber and use thereof
WO2019220014A1 (en) 2018-05-15 2019-11-21 Metsä Spring Oy A method for pre/treatment of paper pulp
US20210010163A1 (en) * 2018-03-06 2021-01-14 Lenzing Aktiengesellschaft Lyocell fiber with increased tendency to fibrillate
CN112553938A (zh) * 2016-02-25 2021-03-26 国际纸业公司 交联牛皮纸浆组合物和方法
US11332883B2 (en) 2013-12-31 2022-05-17 International Paper Company Treated Kraft pulp compositions and methods of making the same

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US11352748B2 (en) 2018-07-31 2022-06-07 International Paper Company Crosslinked pulps, cellulose ether products made therefrom; and related methods of making pulps and cellulose ether products

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US5691193A (en) * 1993-02-25 1997-11-25 Pulp And Paper Research Institute Of Canada Non-chlorine bleaching of kraft pulp
US20020174962A1 (en) * 1999-03-23 2002-11-28 Yoshiya Izumi Process for bleaching lignocellulose pulp
US20040209078A1 (en) * 2003-04-16 2004-10-21 Weyerhaeuser Company Unbleached pulp for lyocell products
US20050150619A1 (en) * 2002-03-06 2005-07-14 Iogen Bio-Products Corporation Xylanase treatment of chemical pulp

Family Cites Families (3)

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US6605350B1 (en) * 1996-08-23 2003-08-12 Weyerhaeuser Company Sawdust alkaline pulp having low average degree of polymerization values and method of producing the same
US6210801B1 (en) * 1996-08-23 2001-04-03 Weyerhaeuser Company Lyocell fibers, and compositions for making same
WO1999016960A1 (en) * 1997-10-01 1999-04-08 Weyerhaeuser Company Cellulose treatment and the resulting product

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5691193A (en) * 1993-02-25 1997-11-25 Pulp And Paper Research Institute Of Canada Non-chlorine bleaching of kraft pulp
US20020174962A1 (en) * 1999-03-23 2002-11-28 Yoshiya Izumi Process for bleaching lignocellulose pulp
US20050150619A1 (en) * 2002-03-06 2005-07-14 Iogen Bio-Products Corporation Xylanase treatment of chemical pulp
US20040209078A1 (en) * 2003-04-16 2004-10-21 Weyerhaeuser Company Unbleached pulp for lyocell products

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120241669A1 (en) * 2009-09-30 2012-09-27 Shanghai Lyocell Fibre Development Co., Ltd. Solvent Spun Bamboo Fiber with High Wet Modulus and Producing Method Thereof
US8926712B2 (en) * 2009-09-30 2015-01-06 Shanghai Lyocell Fibre Development Co., Ltd. Solvent spun bamboo fiber with high wet modulus and producing method thereof
US20110154627A1 (en) * 2009-12-31 2011-06-30 Acelon Chemical And Fiber Corporation Meltblown wetlaid method for producing non-woven fabrics from natural cellulose
US20110156303A1 (en) * 2009-12-31 2011-06-30 Acelon Chemical And Fiber Corporation Spunbond wetlaid method for producing non-woven fabrics from natural cellulose
US8366988B2 (en) * 2009-12-31 2013-02-05 Acelon Chemical And Fiber Corporation Spunbond wetlaid method for producing non-woven fabrics from natural cellulose
US8420004B2 (en) * 2009-12-31 2013-04-16 Acelon Chemical And Fiber Corporation Meltblown wetlaid method for producing non-woven fabrics from natural cellulose
US8420005B2 (en) * 2009-12-31 2013-04-16 Acelon Chemical And Fiber Corporation Meltblown wetlaid method for producing non-woven fabrics with anti-mildew, anti-bacteria and deodorizing capabilities from natural cellulose
US20110156299A1 (en) * 2009-12-31 2011-06-30 Acelon Chemical And Fiber Corporation Meltblown wetlaid method for producing non-woven fabrics with anti-mildew, anti-bacteria and deodorizing capabilities from natural cellulose
CN102127840A (zh) * 2010-01-13 2011-07-20 聚隆纤维股份有限公司 使用湿式纺黏方式制备天然纤维素不织布的方法
CN102127842A (zh) * 2010-01-13 2011-07-20 聚隆纤维股份有限公司 使用湿式熔喷方式制备天然纤维素不织布的方法
US9027765B2 (en) 2010-12-17 2015-05-12 Hollingsworth & Vose Company Filter media with fibrillated fibers
US10478758B2 (en) 2010-12-17 2019-11-19 Hollingsworth & Vose Company Filter media with fibrillated fibers
US9511330B2 (en) 2012-06-20 2016-12-06 Hollingsworth & Vose Company Fibrillated fibers for liquid filtration media
US10322380B2 (en) 2012-06-20 2019-06-18 Hollingsworth & Vose Company Fibrillated fibers for liquid filtration media
US8882876B2 (en) 2012-06-20 2014-11-11 Hollingsworth & Vose Company Fiber webs including synthetic fibers
US11247182B2 (en) 2012-06-20 2022-02-15 Hollingsworth & Vose Company Fibrillated fibers for liquid filtration media
US9352267B2 (en) 2012-06-20 2016-05-31 Hollingsworth & Vose Company Absorbent and/or adsorptive filter media
US10137392B2 (en) 2012-12-14 2018-11-27 Hollingsworth & Vose Company Fiber webs coated with fiber-containing resins
US10030323B2 (en) 2013-04-05 2018-07-24 Lenzing Aktiengesellschaft Method for the production of polysaccharide fibers with an increased fibrillation tendency
WO2014161018A1 (de) * 2013-04-05 2014-10-09 Lenzing Ag Polysaccharidfaser mit erhöhtem fibrillationsvermögen und verfahren zu ihrer herstellung
US10221502B2 (en) 2013-04-05 2019-03-05 Lenzing Aktiengesellschaft Polysaccharide fibers and method for the production thereof
US9701800B2 (en) 2013-04-10 2017-07-11 Lenzing Aktiengesellschaft Polysaccharide film and method for the production thereof
US10220111B2 (en) 2013-06-17 2019-03-05 Lenzing Aktiengesellschaft Highly absorbent polysaccharide fiber and use thereof
US10196758B2 (en) 2013-06-18 2019-02-05 Lenzing Aktiengesellschaft Polysaccharide fibers and method for producing same
US11332883B2 (en) 2013-12-31 2022-05-17 International Paper Company Treated Kraft pulp compositions and methods of making the same
CN112553938A (zh) * 2016-02-25 2021-03-26 国际纸业公司 交联牛皮纸浆组合物和方法
WO2017155487A1 (en) * 2016-03-07 2017-09-14 Veritas Tekstil Konfeksiyon Pazarlama Ve Sanayi Ticaret Anonim Sirketi Water-soluble regenerated fiber production from calluna vulgaris plant species
US20210010163A1 (en) * 2018-03-06 2021-01-14 Lenzing Aktiengesellschaft Lyocell fiber with increased tendency to fibrillate
WO2019220014A1 (en) 2018-05-15 2019-11-21 Metsä Spring Oy A method for pre/treatment of paper pulp

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AR069928A1 (es) 2010-03-03
WO2009088635A3 (en) 2009-09-03
CL2008003884A1 (es) 2009-12-18
WO2009088635A2 (en) 2009-07-16

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