EP2029807A2 - Matière fibreuse lignocellulosique à partir de bois - Google Patents

Matière fibreuse lignocellulosique à partir de bois

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Publication number
EP2029807A2
EP2029807A2 EP07723954A EP07723954A EP2029807A2 EP 2029807 A2 EP2029807 A2 EP 2029807A2 EP 07723954 A EP07723954 A EP 07723954A EP 07723954 A EP07723954 A EP 07723954A EP 2029807 A2 EP2029807 A2 EP 2029807A2
Authority
EP
European Patent Office
Prior art keywords
pulp
otro
lignin content
wood
softwood
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07723954A
Other languages
German (de)
English (en)
Inventor
Hans-Ludwig Schubert
Esa-Matti Aalto
Rudolf Patt
Othar Kordsachia
Christoph Storz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2029807A2 publication Critical patent/EP2029807A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
    • 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
    • D21C3/18—Pulping cellulose-containing materials with halogens or halogen-generating compounds
    • 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
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • D21H11/06—Sulfite or bisulfite pulp

Definitions

  • the invention relates to a lignocellulosic pulp made of wood.
  • Lignocellulosic fibers are used among other things for the production of paper and cardboard. There are a large number of industrially produced lignocellulosic fibers known, which differ widely in their properties:
  • Wood pulp refers to fibers which are produced by mechanical defibration of the fiber composite by means of grinding or grinding aggregates. In the production of wood pulp hardly any wood substance is degraded. The biomass originally used is found almost entirely in wood pulp. The wood pulp production requires high energy input. Recent processes for the production of wood pulp try to improve the fiber properties and / or reduce the energy requirement by pretreating the wood with steam and / or chemicals. These include in particular CTMP (Chemo-Thermomechanical Pulp) and TMP (Thermomechanical PuIp). In CTMP, between 1 and 5% by weight of chemicals, based on otro wood, are usually used in technical applications in order to enable a partial release of the fiber composite. Pulp is generally characterized by low strength properties, especially low tenacity, and high opacity and light scatter with low whiteness and high yellowing tendency.
  • the pulp refers to fibers that are produced by chemical dissolution of the fiber composite.
  • pulp chemicals which usually act on the biomass under high pressure and high temperature.
  • fibers with good strength properties in particular high tenacity and with good bleachability, are produced for high degrees of whiteness and a low tendency to yellow.
  • the energy required to produce the pulp is recovered from the digestion liquor.
  • the lignin content is often not critical. Critical is usually the strength level, as it often limits the application areas. Numerous methods have therefore been developed which attempt to achieve a higher level of strength on the basis of processes of pulp production, even for fibers with a higher lignin content.
  • Another method is the bisulfite process, which operates at pH 4.
  • Other processes such as the Kraft process (also called sulphate process) or the soda process, which are themselves developed and used for the production of minimum lignin pulps, are suitable for the production of high yield pulps been tested.
  • the strength level is measured at 500 ml CSF (26 ° SR) and a comparative measurement is made for 300 ml CSF (41 ° SR). At yields of approx. 80% are achieved for spruce break lengths of about 9-10 km at 500 ml CSF (26 0 SR). With further grinding, the strength values increase. These already relatively high values are achieved by digestion in the acidic pH range (bisulfite digestion, acid sulfite digestion). For fibers from neutral and alkaline digestions (neutral sulphite digestion, power and soda digestion) significantly lower strength values are specified, which must also be produced with a multiple higher use of fiberization and grinding energy. This can be seen from the higher RPM revolutions of the PFI grinder required to achieve a freeness of 500 ml CSF (26 SR) and 300 ml CSF (41 ° SR), respectively.
  • This object is achieved with a lignocellulosic pulp with a breaking length of more than 8 km at 15 0 SR and a lignin content of at least 15% based on the unbleached otro pulp for softwood a breaking length of more than 5.0 km at 20 0 SR and a Lignin content of at least 12% based on the unbleached otro pulp for hardwood.
  • the above-described pulp has a lignin content of at least 15% based on the otro pulp for softwood and at least 12% for hardwood. This lignin content is determined by determination of the Klason lignin and the acid-soluble lignin (for definition see below). Klason lignin and acid-soluble lignin together give the lignin content of the respective pulp.
  • the lignin content of hardwoods is lower than that of softwoods because the latter have a higher initial lignin content.
  • the lignin content of the fibrous material according to the invention may also be quite higher for deciduous and coniferous wood, in particular more than 18%, more than 21% or more than 24% for softwood.
  • the values may be at least 14%, at least 16% or more than 18% lignin based on the otro pulp.
  • the fibrous material according to the invention differs from the prior art in that the fibers show high strength values even at a much lower degree of grinding than known fibers.
  • the freeness is a measure of the dewatering behavior of a fiber suspension.
  • Known high lignin fibers have a structure at 15 ° SR which is incapable of establishing good bond with adjacent fibers, and thus an acceptable static strength level.
  • the fiber material of the invention is, however, even at low freeness of 12 SR or 0 15 0 SR so -and- by little effort to Mahlenergy- able to build a good bond to adjacent fibers.
  • the achievable strength values are for softwood with a lignin content of at least 15% over 8 km. Values of more than 9 km, more than 9.5 km and - preferably - more than 10 km breaking length at 15 0 SR each are readily achievable for these fibers. For hardwood with a lignin content of at least 12%, the achievable tearing length is often determined by the type of wood. The values stated in claim 1 represent the lower limit for hardwoods. For example, for poplar fibers with a lignin content of more than 12%, breaking length values of more than 6 km, preferably more than 7 km, more preferably more than 7 , Measured 5 km at 20 0 SR each.
  • the fibrous material according to the invention is not only characterized by high breaking lengths. Rather, the strength level is high overall.
  • the softwood fibrous material of the invention having a lignin content of more than 15% at 15 0 and SR based on a sheet weight of 100 g / m 2
  • the tear strength is 100 g / m 2 sheet weight of at least 50 cN at a freeness of 20 SR 0.
  • the pulp has an unusually high whiteness.
  • values of 40% ISO and more are measured for coniferous wood, and for hardwood values of at least 60% ISO. It is also easily possible to achieve values of over 60% ISO for softwood. Since the lignin is generally considered to be coloring the pulp, it is remarkable to achieve such a whiteness despite the high lignin content.
  • the fiber properties improve considerably.
  • Bleaching treatment is required for some applications with higher whiteness requirements; but it also aims to adjust and improve fiber properties.
  • the bleached pulp not only has a significantly higher brightness of over 70% ISO, preferably more than 75% ISO for softwood and more than 60% ISO, preferably more than 80% ISO for hardwood.
  • the breaking lengths for softwood increase to more than 9 km, preferably to more than 9.5, more preferably to more than 10 km at 15 0 SR.
  • the softening strength of softwood can be stabilized, as a rule, improved.
  • poplar fibers at 20 ° SR have a tenacity of more than 7 km, preferably more than 8 km.
  • Beech pulps have, after bleaching, a breaking length of more than 5.5 km, preferably more than 6 km.
  • the tear resistance does not change significantly as a result of bleaching.
  • the yield was calculated by weighing the raw material used and the pulp obtained after the digestion or bleaching, in each case dried at 105 ° C. to constant weight (atro).
  • the lignin content was determined as Klason lignin according to TAPPI T 222 om-98.
  • the acid-soluble lignin was determined according to TAPPI UM 250
  • the whiteness was determined by preparing the test sheets according to Zellcheming leaflet V / 19/63, measured according to SCAN C 11:75 with a Datacolor elrepho 450 x photometer; the whiteness is given in percent according to ISO standard 2470.
  • the opacity was determined according to the specifications of Zellcheming-MerkblattVI / 1/66.
  • Density was determined according to Zellcheming regulation V / 11/57. Tear length was determined according to Zellcheming regulation V / 12/57. The tear resistance was determined according to DIN 53 128 Elmendorf. It is given for a leaf with a leaf weight of 100 g / m 2 . - The degree of grinding was recorded according to Zellcheming leaflet V / 3/62.
  • spruce wood chips that were steamed for 30 minutes at 105 0 C to 110 0 C, with a total use of chemicals of 27.5% sodium sulfite (calculated as NaOH) , related to otro wood pulp, offset.
  • a liquor ratio of 4: 1 (chemical solution: otro wood pulp) is set.
  • the pH at the beginning of the digestion to pH 9.4 (Example 4).
  • Digestions at lower initial pH's of 8 (Example 3), 7 (Example 2) or 6 (Example 1) are adjusted to these lower initial pHs by addition of SO 2.
  • the chips are heated in a digestion in the liquid phase within 90 minutes to a digestion temperature of 170 0 C and 180 minutes at this temperature unlocked.
  • the free cooking liquor is withdrawn and the wood chips are shredded.
  • the fiber composite is thus decomposed without mechanically acting on the individual fiber or the fiber surface.
  • For fiberizing the chips much less energy is required than in known methods for producing high-yield pulps. Less than 500 kWh / t wood chips are enough to defibrate the pulp.
  • the required energy is preferably less than 300 kWh / t wood chips.
  • the yield of more than 75% in each case based on the originally used wood pulp corresponds to a pulp with a lignin content of well over 20%.
  • the average lignin content for spruce wood is given as 28% of the otro wood mass (Wagensuppl, Anatomie des Holzes, VEB frabuchverlag für, 1980).
  • the actual lignin content of the pulp is higher because during the digestion mainly, but not exclusively, lignin is broken down.
  • Carbohydrates (cellulose and hemicelluloses) are also dissolved in small amounts. The values given show that the digestion has a good selectivity with regard to lignin and carbohydrate degradation.
  • the whiteness is unexpectedly high with values of more than 55% ISO and thus provides a good starting point for a possible subsequent bleaching.
  • a grinding time of 20 to 30 minutes is required. Up to a grinding time of 20 minutes (freeness SR 12 0 - 15 0 SR), the freeness developed independently of the pH value at the start of the digestion (pH 6 to pH 9.4) in a narrow corridor.
  • Example 1 results in an overall high level of strength with a breaking length of 8.9 km and a breaking strength of 53.8 cN. However, if the initial pH is 7 or above, the tearing length increases to 9 km and beyond. The tear strength reaches values of 65 cN and above.
  • Beech or poplar wood chips are each steamed at 105 0 C to 110 0 C for 30 minutes.
  • the poplar chips are mixed with 20% sodium sulfite based on the otro wood pulp at a liquor ratio of 4: 1.
  • both types of wood were heated up to the digestion temperature of 170 ° C. in 90 minutes.
  • the digestion time is 60 minutes at maximum temperature for beech and 30 minutes at maximum temperature for poplar.
  • the free digestion solution is stripped off and the chips are defibrated, that is, the fiber composite is dissolved, without affecting grinding on the individual fiber or fiber surface.
  • the yield is 75% and above, based on the otro wood chips. Again, the good selectivity of the digestion of the invention shows.
  • the fibers produced in this way already exhibit an extraordinarily high degree of whiteness, which is more than 65% ISO. This provides a good basis for any subsequent bleaching.
  • the beech has a breaking length that is considerable for this type of wood.
  • the tear resistance is more than 50 cN.
  • the strength level for the poplar pulp is even higher.
  • a tearing length of more than 7.5 km and a breaking strength of 65 cN at 20 ° SR are not known for hardwood high lignin pulps.
  • the softwood pulp produced as described above was bleached to increase the whiteness.
  • the whitening should be done with the lowest possible yield losses.
  • the aim was therefore a lignin-preserving bleach. Usually bleached in several stages.
  • the reaction conditions for the various bleaching treatments are explained below:
  • the heavy metal content of the pulp is reduced.
  • the pulp is adjusted at 3% consistency with 4N sulfuric acid to a pH of 5 - 5.2 and mixed for 30 minutes at 60 0 C with 0.2% DTPA.
  • the P-stage was carried out with hydrogen peroxide as a bleaching agent. At a consistency of 10% was bleached at 80 0 C for 240 minutes with the addition of 5% hydrogen peroxide based on otro pulp and addition of 2.5% NaOH, 3% silicate and 0.1% magnesium sulfate (each based on otro pulp) , The pH at the beginning was measured at 11, at the end of the bleaching with 9.7. This is followed by a wash.
  • the FAS stage relies on FAS (formamidinesulfinic acid) as a means of brightening the pulp.
  • the bleaching is carried out at high temperature (99 0 C) for 30 minutes at a pulp density of 12%.
  • FAS formamidinesulfinic acid
  • the bleaching is carried out at high temperature (99 0 C) for 30 minutes at a pulp density of 12%.
  • FAS 0.5% NaOH
  • silicate each based on otro pulp.
  • the pulp was bleached after digestion with a sequence Q P FAS. It has a total yield after bleaching of 82% (based on the otro wood chips at the beginning of the digestion) a lignin content of 24% based on the otro fiber mass. The whiteness at the end of the bleaching sequence is measured at 77% ISO.
  • the breaking length at 15 0 SR is 8.86 km, the tear resistance is 60.1 cN.
  • the opacity is measured at 68.3, based on a sheet weight of 80 g / m 2 . With continued grinding, the breaking length increases further, tear resistance and opacity decrease.
  • a yield (unbleached) of 78.5% based on otro wood chips and a whiteness of 61.7% ISO is measured.
  • the lignin content of the fibers was determined to be 20% relative to the otro fiber mass (see Table i).
  • the breaking length at 15 ° SR was 8.97 km, the breaking strength was 69.8 cN and the opacity was measured at 82.2% ,
  • the whiteness of the bleached pulp is measured at 76.7% ISO.
  • the bleaching sequence was Q P FAS.
  • the total yield, based on the spruce wood chips used was 74.3%.
  • the lignin content of the bleached fibers was 17.8% based on the otro fiber mass of the bleached fibers.
  • the tenacity of this bleached pulp was measured to be 9.34 km at 15 ° SR and the tear propagation to 56.6 cN.
  • the opacity was determined to be 71.2%.
  • the tenacity of the bleached spruce pulp was measured to be 10.5 km at 15 ° SR, the tear resistance was 70.2 cN and the opacity was 66.8%.
  • Example 4 fiber pulped at pH 9.4, bleached
  • the whiteness of the unbleached pulp was measured at 57.6% ISO.
  • the yield was determined to be 79.3% based on the otro spruce wood chips used.
  • the lignin content was 19.9% for the unbleached otro pulp.
  • the tenacity of the furnish at 15 ° SR was 9.64 km, the tear resistance was 66.8 cN, and the opacity was measured to be 79.9.
  • the tenacity at 15 0 SR was 10.58 km, the tear strength was 70.7 cN and the opacity was 66%.
  • the bleached fibers have slightly improved strength properties compared to the unbleached fabrics without excessive yield losses.
  • the pulp in the bleach behaves very positively, together with the achieved whiteness increase is a good level of strength and overall good yield based on the originally used otro woodchip quantity recorded.
  • Beech chips were digested with an initial pH of 9.4.
  • the cooked fiber was extremely easy to grind and with very little grinding energy.
  • the fiber properties were determined at 20 0 SR.
  • the whiteness of the unbleached fabric was measured at 69.7% ISO, the yield was 75.0% of the total otro amount of wood chips used.
  • the lignin content of the beech pulp was determined to be 16.5% of the unbleached otro beech pulp, based on an average lignin content for beech of 22%.
  • the tenacity at 20 0 SR was measured to be 5.25 km, the fürr adoptedfestig- ness 53.1 cN and opacity for a sheet weight of 80 g / m 2 with 85.3%.
  • the breaking length measured at 20 ° SR, was over 6 km.
  • the tear resistance has not changed significantly.
  • the unbleached poplar pulp was also analyzed at 20 ° SR.
  • the whiteness was measured at 67.8% ISO, the yield was 79.0% based on the used otro poplar wood chips.
  • the lignin content of the poplar pulp was determined to be 15% based on the unbleached otro poplar pulp, based on an average 20% lignin content for poplar.
  • the breaking length was measured at 20 0 SR 7.72 km, the tear resistance of 65,0 cN and the opacity was determined to be 80.0%.
  • the breaking length of the bleached poplar pulp was measured at 20 ° SR with a breaking length of about 8.3 km, and the tear resistance has not changed significantly as a result of the bleaching.
  • Example 7 Spruce pulp, unbleached
  • the pulp according to Example 7 was prepared from spruce woodchips under the conditions of Example 1, with the following changes: In addition to the 27.5% total chemicals (sulfite and NaOH in given proportions), 0.1% of the anthraquinone was added to the chemical solution Amount of wood added. The duration of the digestion was shortened to 45 minutes.
  • Example 7 As Example 7, but with a total use of chemicals of 25% based on the used otro amount of wood and a digestion time of 50 minutes.
  • Example 7 With a total chemical use of 22, 5% and a digestion time of 50 minutes.
  • Example 10 Spruce Fiber, Unbleached As Example 7, but with a total chemical input of 20% and 55 minutes digestion time.
  • Example 12 Spruce pulp, unbleached
  • Example 7 As Example 7, but with a total chemical input of 15% and a digestion time of 60 minutes.
  • the bleaching of the pulp according to Example 12 leads to the following results: After the Q-stage, the whiteness stagnates at 52.2% ISO. The yield of this step is 99.3% based on otro fiber mass.
  • the P-stage leads to a whiteness increase to 64.3% ISO with a yield of 97.1% based on otro fiber mass.
  • the FAS stage brings another whiteness increase to 75.1% ISO with a yield of 98.9% based on otro fiber mass.
  • the whiteness increase in total amounts to 21.3% ISO with a total yield of 77.3% based on the initially used otro wood pulp.
  • the chemicals used are sulfite and 0.1% anthraquinone.
  • the chemical solution is removed.
  • the chips impregnated with the chemical solution are heated to 170 ° C. with steam in about 5 minutes. This vapor phase at 170 0 C is held for 60 minutes. Then the steam is released and within 30 seconds, the digester is cooled to 100 0 C and it is set to ambient pressure. The wood chips are removed from the stove and shredded. Aliquots of the spruce pulp so produced are ground and the ground fractions and pulp properties are determined for the ground portions.
  • Example 13 As Example 13, but with a digestion time in the vapor phase of 45 minutes. The use of chemicals is increased to 63.0% based on the amount of wood used.
  • Example 14 but with a digestion time of 30 minutes.
  • Example 16 Fibrous pulp produced in the vapor phase, unbleached
  • Example 14 As Example 14, but with a digestion temperature of 170 0 C.
  • the digestions in the vapor phase show a low overall time requirement. Compared to the digestion in the liquid phase, the heating up to the maximum digestion temperature takes place much faster. The actual digestion then takes the same duration as a boiling in the liquid phase. There is no free-flowing chemical solution during vapor phase digestion, which is removed after impregnation and before digestion. It is therefore less mixed with organic material than the chemical solution, which is withdrawn after digestion in the liquid phase. However, this does not affect the quality of the pulp produced.
  • the yield of the liquid phase in the presence of anthraquinone shown in Table 3 is over 75% based on the otro amount of wood.
  • Example 14 The whiteness of the fibers produced in Examples 13 to 16, however, is significantly lower than in Examples 7 to 12. From only 32.2% ISO in the vapor phase digestion with a maximum digestion time of 60 minutes, the degree of whiteness increases to 45 when the digestion is shortened Minutes to 39.1% ISO. Further reduction of the digestion time to 30 minutes leads to an increase to 43.1% ISO. A significant effect is the reduction of the maximum digestion temperature from 170 0 C to 155 0 C: the whiteness rises to 49.1% ISO.
  • the fibers produced in the vapor phase have excellent strengths.
  • the tenacity was measured at 10 km (Example 15) and at 11 km (Example 14) at 15 0 SR.
  • Tear resistance was measured to be 82.8 cN (Example 15) and 91.0 cN (Example 14). These values correspond to, or are even higher than, the best values achieved for liquid phase digests. For fibrous materials of the prior art comparable strength values are not known.
  • the bleaching of a pulp-digested pulp shows that the low initial whiteness does not hinder the use requirements.
  • the Q-calls do not cause any significant whiteness change.
  • the P-level results in a whiteness increase of about 20% ISO to 63.4% ISO.
  • the pulp is moving at the same whiteness level that the pulp-digested pulps have after the P-stage.
  • a whiteness of 74.0% ISO is measured, which is also consistent with the results measured for liquid phase digested fiber.
  • the total yield after completion of the bleaching sequence Q P FAS is 71.6% based on the original used otro wood pulp.
  • the whiteness increase due to bleaching is more than 30% ISO.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

L'invention concerne une matière fibreuse lignocellulosique à partir de bois avec une longueur de rupture de plus de 8 km à 15 °SR et une teneur en lignine d'au moins 15 % sur base de la matière fibreuse séchée à l'étuve, non blanchie, pour le bois de conifère et une longueur de rupture de plus de 5,0 km à 20 °SR et une teneur en lignine d'au moins 12 % sur base de la matière fibreuse séchée à l'étuve, non blanchie, pour le bois de feuillus.
EP07723954A 2006-06-08 2007-04-04 Matière fibreuse lignocellulosique à partir de bois Withdrawn EP2029807A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006027005A DE102006027005A1 (de) 2006-06-08 2006-06-08 Lignocellulosischer Faserstoff aus Holz
PCT/EP2007/003013 WO2007140838A2 (fr) 2006-06-08 2007-04-04 Matière fibreuse lignocellulosique à partir de bois

Publications (1)

Publication Number Publication Date
EP2029807A2 true EP2029807A2 (fr) 2009-03-04

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Country Status (8)

Country Link
US (1) US8152960B2 (fr)
EP (1) EP2029807A2 (fr)
JP (1) JP2009540133A (fr)
CN (1) CN101466889A (fr)
BR (1) BRPI0712387A2 (fr)
CA (1) CA2634202C (fr)
DE (1) DE102006027005A1 (fr)
WO (1) WO2007140838A2 (fr)

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EP2029808A2 (fr) * 2006-06-08 2009-03-04 Voith Patent GmbH Procédé de préparation de matière fibreuse à partir de bois
DE102007007654A1 (de) * 2007-02-13 2008-08-14 Voith Patent Gmbh FAS Bleiche
DE102007022749A1 (de) * 2007-05-11 2008-11-13 Voith Patent Gmbh Lignocellulosischer Faserstoff aus Holz
DE102009010696A1 (de) * 2009-02-27 2010-09-02 Voith Patent Gmbh Verfahren zur Herstellung von Magazinpapier
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DE102014112096B4 (de) * 2014-08-25 2020-02-20 McAirlaid's Vliesstoffe GmbH Saugfähige Faserstoffbahn
CN106758485B (zh) * 2016-12-30 2018-07-03 齐鲁工业大学 一种速生杨的生物化学法ecf漂白kp浆制备纸基材料的方法
CN106498796B (zh) * 2016-12-30 2017-10-10 齐鲁工业大学 一种速生杨的生物化学法ECF漂白NaOH‑AQ浆制备纸基材料的方法
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CA2634202C (fr) 2014-12-16
BRPI0712387A2 (pt) 2012-07-17
CN101466889A (zh) 2009-06-24
DE102006027005A1 (de) 2007-12-13
CA2634202A1 (fr) 2007-12-13
US8152960B2 (en) 2012-04-10
WO2007140838A3 (fr) 2008-03-27
JP2009540133A (ja) 2009-11-19
WO2007140838A2 (fr) 2007-12-13
US20090229774A1 (en) 2009-09-17

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