NO174167B - Process for the preparation of mechanical pulp, as well as the use of enzymes and / or chemicals in the production of mechanical pulp - Google Patents
Process for the preparation of mechanical pulp, as well as the use of enzymes and / or chemicals in the production of mechanical pulp Download PDFInfo
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- NO174167B NO174167B NO905352A NO905352A NO174167B NO 174167 B NO174167 B NO 174167B NO 905352 A NO905352 A NO 905352A NO 905352 A NO905352 A NO 905352A NO 174167 B NO174167 B NO 174167B
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- Prior art keywords
- mechanical pulp
- production
- pulp
- lignin
- chemical
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- 239000000126 substance Substances 0.000 title claims description 25
- 108090000790 Enzymes Proteins 0.000 title claims description 23
- 102000004190 Enzymes Human genes 0.000 title claims description 23
- 229920001131 Pulp (paper) Polymers 0.000 title claims description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 16
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 24
- 239000011230 binding agent Substances 0.000 claims description 16
- 239000004155 Chlorine dioxide Substances 0.000 claims description 12
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 12
- 229920005610 lignin Polymers 0.000 claims description 12
- 230000001590 oxidative effect Effects 0.000 claims description 10
- 108010029541 Laccase Proteins 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 3
- 108010054320 Lignin peroxidase Proteins 0.000 claims description 3
- 108010059896 Manganese peroxidase Proteins 0.000 claims description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 229910001448 ferrous ion Inorganic materials 0.000 claims description 3
- 102000004169 proteins and genes Human genes 0.000 claims description 3
- 108090000623 proteins and genes Proteins 0.000 claims description 3
- 102000003992 Peroxidases Human genes 0.000 claims 1
- 229930195733 hydrocarbon Natural products 0.000 claims 1
- 150000002430 hydrocarbons Chemical class 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 claims 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 108040007629 peroxidase activity proteins Proteins 0.000 claims 1
- 238000002474 experimental method Methods 0.000 description 29
- 239000000835 fiber Substances 0.000 description 16
- 229920002472 Starch Polymers 0.000 description 13
- 235000019698 starch Nutrition 0.000 description 13
- 239000008107 starch Substances 0.000 description 13
- 239000002023 wood Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000123 paper Substances 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000001888 Peptone Substances 0.000 description 2
- 108010080698 Peptones Proteins 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000011111 cardboard Substances 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 235000019319 peptone Nutrition 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 229910021653 sulphate ion Inorganic materials 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- IUQJDHJVPLLKFL-UHFFFAOYSA-N 2-(2,4-dichlorophenoxy)acetate;dimethylazanium Chemical compound CNC.OC(=O)COC1=CC=C(Cl)C=C1Cl IUQJDHJVPLLKFL-UHFFFAOYSA-N 0.000 description 1
- 102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 1
- 241000222356 Coriolus Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 1
- 241000446313 Lamella Species 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 239000007979 citrate buffer Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000006911 enzymatic reaction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Classifications
-
- 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
- D21H11/08—Mechanical or thermomechanical pulp
-
- 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
- D21C3/006—Pulping cellulose-containing materials with compounds not otherwise provided for
-
- 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
Oppfinnelsen vedrører en fremgangsmåte til fremstilling av mekanisk masse av et fibrøst produkt, samt anvendelse av enzymer og/eller kjemikalier ved fremstilling av mekanisk masse. The invention relates to a method for producing mechanical pulp from a fibrous product, as well as the use of enzymes and/or chemicals in the production of mechanical pulp.
Fremstillingen av mekanisk masse av et fibrøst produkt, såsom helved, treflis, spon eller raffinert masse gjennomføres hovedsakelig ved hjelp av mekanisk metoder. Fremstillingen av mekanisk masse er basert på anvendelsen av friksjon. Energi overføres til trematerialet i en kompresjon-frigivningsprosess som danner friksjonsvarme som mykgjør trematerialet slik at de enkelte fibre kan frigjøres. The production of mechanical pulp from a fibrous product, such as whole wood, wood chips, shavings or refined pulp, is carried out mainly by means of mechanical methods. The production of mechanical pulp is based on the application of friction. Energy is transferred to the wood material in a compression-release process that creates frictional heat that softens the wood material so that the individual fibers can be released.
Hensikten med masse- eller pulpproduksjon er å redusere trestrukturen i fibrene og å behandle fibrene for å gjøre dem egnet for bruk som råmateriale ved fremstillingen av papir eller papp. Den naturlige funksjon av trefibre er helt nøyaktig motsatt av denne hensikt, dvs. å danne en støttestruktur som er så sterk som mulig. The purpose of pulp or pulp production is to reduce the wood structure in the fibers and to treat the fibers to make them suitable for use as raw material in the manufacture of paper or cardboard. The natural function of wood fibers is exactly the opposite of this purpose, i.e. to form a support structure that is as strong as possible.
Fibrene bindes til hverandre av en mellomlamell som hovedsakelig består av lignin. Ved fremstillingen av kjemisk masse blir mellomlamellene eller -skivene oppløst ved bruk av kjemikalier. Fibrene kan separeres uødelagt, men foruten ligniner blir også noe av hemicellulosen i trematerialet oppløst. Bare cirka halvdelen av fiberinnholdet i trematerialet kan utvinnes, dvs. utbyttet er 50%. I mekaniske fremgangsmåter blir ligninet mykgjort ved hjelp av vann, varme og gjentatt anvendelse av mekaniske belastninger, slik at fibrene kan "rives" fra hverandre. Fibrene blir revet opp ved prosessen, men utbyttet er så høyt som 96-98%. The fibers are bound to each other by an intermediate lamella which mainly consists of lignin. In the production of chemical pulp, the intermediate lamellae or disks are dissolved using chemicals. The fibers can be separated undamaged, but in addition to lignins, some of the hemicellulose in the wood material is also dissolved. Only approximately half of the fiber content in the wood material can be recovered, i.e. the yield is 50%. In mechanical methods, the lignin is softened with the help of water, heat and repeated application of mechanical loads, so that the fibers can be "torn" apart. The fibers are torn up during the process, but the yield is as high as 96-98%.
Mekaniske masser fremstilles ved å skille fibrene som er bundet sammen i trematerialet, enten ved maling av trematerialet mot en malesten eller ved å raffinere treflis i skiveraffinører. Den første massetype blir vanligvis kalt tremassepulp og sistnevnte type kalles raffinert mekanisk pulp eller masse. Ved de mer avanserte raffineringsmetoder benyttes varme (TMP) og eventuelt også kjemikalier (CTMP). Mechanical pulps are produced by separating the fibers that are bound together in the wood material, either by grinding the wood material against a grinding stone or by refining wood chips in disc refiners. The first type of pulp is usually called wood pulp and the latter type is called refined mechanical pulp or pulp. The more advanced refining methods use heat (TMP) and possibly also chemicals (CTMP).
Utbyttet ved de mekaniske masseproduksjonsmetoder er høyt. Bare noen få prosent av vekten av trematerialet går tapt. Derfor er kostnadene for trematerialet pr. tonn masse eller pulp lav. På den annen side er energiforbruket høyt og energikostnadene er en betydelig faktor. I tillegg vil den voldsomme mekaniske behandling bevirke en fiberødeleggelse og reduserer styrken for det papir som fremstilles av massen, som er grunnen til at anvendelsen av mekanisk masse er begrenset til visse produkter med et lavere krav til kvalitetsnivået. The yield of the mechanical mass production methods is high. Only a few percent of the weight of the wood material is lost. Therefore, the costs for the wood material per tons of pulp or pulp low. On the other hand, energy consumption is high and energy costs are a significant factor. In addition, the violent mechanical treatment will cause fiber destruction and reduce the strength of the paper produced from the pulp, which is why the use of mechanical pulp is limited to certain products with a lower requirement for the quality level.
Ved tidligere undersøkelser er det blitt funnet at styrkeegenskapene til mekaniske masser kan bli påvirket av raffineringsgraden og av mekaniske tilsetningsbindemidler eller mykvedsul-fatmasse i den mekaniske masse. In previous investigations, it has been found that the strength properties of mechanical pulps can be influenced by the degree of refining and by mechanical additive binders or softwood sulphate pulp in the mechanical pulp.
En økning av raffineringsgraden innbefatter ulempen av økte produksjonskostnader og en lav bearbeidbarhet (vannfri kvalitet) for det raffinerte produkt. Tilsetning av sulfatmasse til den mekaniske masse blir vanligvis unngått i så stor grad som mulig pga. kostnadene. An increase in the degree of refining includes the disadvantage of increased production costs and a low workability (water-free quality) of the refined product. Addition of sulphate pulp to the mechanical pulp is usually avoided as much as possible due to the costs.
Bindemidler benyttes for å styrke bindingen mellom fibrene. Styrkeegenskapene for papir er i stor grad avhengig av disse bindinger. Det i størst utstrekning benyttede tørrstyrke-bindemiddel er kationisk stivelse. For tremasser med et høyt innhold av fine fibre og fyllstoffer er mengden av stivelse som er nødvendig 0,5-2%. Hvis stivelsen benyttes i mengder som overskrider dette, vil maskinens muligheter såvel som papir-kvaliteten praktisk talt alltid avta. Binders are used to strengthen the bond between the fibers. The strength properties of paper are largely dependent on these bonds. The most widely used dry strength binder is cationic starch. For wood pulps with a high content of fine fibers and fillers, the amount of starch required is 0.5-2%. If the starch is used in quantities that exceed this, the machine's capabilities as well as the paper quality will practically always decrease.
En hensikt med oppfinnelsen er således å tilveiebringe en prosess med hvilken styrkeegenskapene til mekanisk masse kan bli forbedret. One purpose of the invention is thus to provide a process by which the strength properties of mechanical pulp can be improved.
Dette oppnås ved en fremgangsmåte som ifølge oppfinnelsen er kjennetegnet ved at det fibrøse produkt utsettes for en kjemisk behandling og/eller enzymbehandling ved hvilken et bindemiddel forbindes med ligninet i det fibrøse produkt. Ytterligere trekk ved oppfinnelsen fremgår av underkravene. Oppfinnelsen omfatter også anvendelsen av enzymer og/eller kjemikalier som virker på lignin, sammen med bindemidler for å øke styrkeegenskapene ved fremstilling av mekanisk masse. Ytterligere trekk ved anvendelsen er angitt i kravene. This is achieved by a method which, according to the invention, is characterized by subjecting the fibrous product to a chemical treatment and/or enzyme treatment by which a binder is connected to the lignin in the fibrous product. Further features of the invention appear from the subclaims. The invention also includes the use of enzymes and/or chemicals that act on lignin, together with binders to increase the strength properties in the production of mechanical pulp. Further features of the application are specified in the requirements.
I henhold til oppfinnelsen er det funnet at, ved bruk av et enzym og/eller et kjemikalium er det mulig å tilsette et egnet molekyl til de frie og lett oksiderbare ligningrupper. Hvis et bindemiddel er forenet med fiberflaten i en kjemisk reaksjon, vil det forbedre styrkeegenskapene til fiberen. Hvis nødvendig kan mengden av bindemiddel som benyttes bli øket uten å frembringe uheldige virkninger. Bindingen mellom bindemiddel og fiber dannes enten ved bruk av oksiderende enzymer eller oksiderende kjemikalier som frembringer radikaler. According to the invention, it has been found that, by using an enzyme and/or a chemical, it is possible to add a suitable molecule to the free and easily oxidizable lignin groups. If a binder is united with the fiber surface in a chemical reaction, it will improve the strength properties of the fiber. If necessary, the amount of binder used can be increased without producing adverse effects. The bond between binder and fiber is formed either through the use of oxidizing enzymes or oxidizing chemicals that produce radicals.
Styrkeegenskapene kan forbedres med en enzymbehandling i hvilken mekanisk masse behandles i nærvær av visse substanser, f.eks. karbohydrater og proteiner, som inneholder hydrofile grupper, med enzymer som virker på lignin. Kjemisk binding kan fordelaktig oppnås i mekaniske masser fremstilt ved forskjel-lige kondisjoneringsmetoder ved at lignin eller dets derivater er tilstede i reaksjonsblandingen. The strength properties can be improved with an enzyme treatment in which mechanical pulp is treated in the presence of certain substances, e.g. carbohydrates and proteins, which contain hydrophilic groups, with enzymes that act on lignin. Chemical bonding can advantageously be achieved in mechanical masses produced by various conditioning methods by lignin or its derivatives being present in the reaction mixture.
Formålet med oksidasjonsbehandlingen, enten ved hjelp av enzymer eller kjemikalier, er i fibrenes lignin å frembringe et radikal med hvilket bindemiddelet forbindes med en kjemisk binding eller kjedes til en kjemisk binding slik at styrkeegenskapene for massen blir vesentlig forbedret. Substansen som benyttes for fremstilling av et radikal er fortrinnsvis lakase, ligninperoksidase, manganperoksidase eller et oksiderende kjemikalium som frembringer radikaler, f.eks. klordioksid, ozon eller hydrogenperoksid sammen med ferroioner. Eksempler på egnede enzymer er de som frembringes av hvitråtesopp, f.eks. lakase fremstilt av soppen Coriolus versiculum. Massetempera-turen under enzymbehandlingen kan ligge i området 10-9 0°C, fortrinnsvis 40-70°C og pH-verdien i området 2,0-10,0, fortrinnsvis 4,0-8,0. I tillegg må redokspotensialet være relativt høyt, ved enzymbehandling tilnærmet 100-600 mV, fortrinnsvis 300-500 mV og ved kjemisk behandling over 200 mV. The purpose of the oxidation treatment, either with the help of enzymes or chemicals, is to produce a radical in the fibers' lignin with which the binder is connected with a chemical bond or chained to a chemical bond so that the strength properties of the pulp are significantly improved. The substance used to produce a radical is preferably laccase, lignin peroxidase, manganese peroxidase or an oxidizing chemical that produces radicals, e.g. chlorine dioxide, ozone or hydrogen peroxide together with ferrous ions. Examples of suitable enzymes are those produced by white rot fungi, e.g. laccase produced by the fungus Coriolus versiculum. The mass temperature during the enzyme treatment can be in the range 10-90°C, preferably 40-70°C and the pH value in the range 2.0-10.0, preferably 4.0-8.0. In addition, the redox potential must be relatively high, with enzyme treatment approximately 100-600 mV, preferably 300-500 mV and with chemical treatment above 200 mV.
I det følgende skal oppfinnelsen beskrives mere detaljert ved hjelp av utførelseseksempelet som er basert på laboratorie-prøver. In what follows, the invention will be described in more detail with the help of the design example which is based on laboratory tests.
EKSEMPEL 1 EXAMPLE 1
20 g (ahs.k) av gjenvunnet papirmasse fremstilt av gjen-vinningspapir og papp ble fortynnet med vann til en konsistens på 2,5% var nådd. 20 g (ahs.k) of recycled pulp made from recycled paper and cardboard was diluted with water until a consistency of 2.5% was reached.
Blandingen ble oppvarmet til 40°C. Deretter ble stivelse (Amisol 202) i en mengde på 5% tilsatt til blandingen, som ble godt omrørt. Vannfortynnet klordioksid i en mengde på 0,5% av mengden masse ble tilsatt til reaksjonsblandingen. Reaksjonen ble holdt gående ved 4 0°C i 2 timer. The mixture was heated to 40°C. Then starch (Amisol 202) in an amount of 5% was added to the mixture, which was well stirred. Water-diluted chlorine dioxide in an amount of 0.5% of the amount of pulp was added to the reaction mixture. The reaction was kept going at 40°C for 2 hours.
Deretter ble massen vasket med 2 0 ganger større mengde vann, hvoretter den ble konsentrert og analysert. The mass was then washed with 20 times the amount of water, after which it was concentrated and analyzed.
Resultatene som viser styrken av massen er vist i Tabell 1. The results showing the strength of the mass are shown in Table 1.
I tillegg til forsøket som er beskrevet ovenfor (forsøk 5) ble tre referanseforsøk (forsøk 1, 2 og 3) og to ekstra forsøk (forsøk 4 og 6) gjennomført. Resultatene av disse er likeledes gjengitt i Tabell 1. Forsøkene ble gjennomført på følgende måte: In addition to the trial described above (trial 5), three reference trials (trials 1, 2 and 3) and two additional trials (trials 4 and 6) were carried out. The results of these are also reproduced in Table 1. The experiments were carried out in the following way:
Forsøk 1 (referanse): Massen ble ikke behandlet med klordioksid og ingen stivelse ble tilstått til den. Forøvrig ble forsøket gjennomført og analysert i samsvar med forsøket som er beskrevet ovenfor (Forsøk 5). Experiment 1 (reference): The pulp was not treated with chlorine dioxide and no starch was added to it. Otherwise, the experiment was carried out and analyzed in accordance with the experiment described above (Experiment 5).
Forsøk 2 (referanse): Ingen klordioksidbehandling av massen ble gjennomført. Forøvrig ble gjennomføringen og analysen av forsøket gjennomført i samsvar med forsøket som er beskrevet ovenfor (forsøk 5). Experiment 2 (reference): No chlorine dioxide treatment of the pulp was carried out. Otherwise, the execution and analysis of the experiment was carried out in accordance with the experiment described above (experiment 5).
Forsøk 3 (referanse): Ingen klordioksidbehandling ble gjen-nomført. Stivelse ble tilført til massen i en mengde på 10% av massemengden. Experiment 3 (reference): No chlorine dioxide treatment was carried out. Starch was added to the mass in an amount of 10% of the mass amount.
Forsøk 4: Massen ble behandlet med klordioksid, men ingen stivelse ble tilsatt. Forøvrig svarer gjennomføringen og analysen av forsøket til det forsøk som er beskrevet ovenfor (forsøk 5). Metoden som representeres av dette forsøk hører til innenfor oppfinnelsens ramme. Experiment 4: The pulp was treated with chlorine dioxide, but no starch was added. Otherwise, the implementation and analysis of the experiment corresponds to the experiment described above (experiment 5). The method represented by this experiment belongs within the scope of the invention.
Forsøk 6: Massen ble behandlet med klordioksid etter en stivelsestilsetning på 10% av massemengden. Forøvrig svarer gjennomføringen og analysen av forsøket til forsøket som er beskrevet ovenfor (forsøk 5). Prosessen som representeres med dette forsøk hører til innenfor oppfinnelsens ramme. Trial 6: The pulp was treated with chlorine dioxide after a starch addition of 10% of the pulp quantity. Otherwise, the implementation and analysis of the experiment corresponds to the experiment described above (experiment 5). The process represented by this experiment belongs within the scope of the invention.
EKSEMPEL 2 EXAMPLE 2
Ubleket TMP-masse ble vasket med ioneutvekslet vann og sentrifugert. Massen ble bufret med en Na-sitratbuffer, fortynnet til en konsistens på 2,5% og oppvarmet til 40°C. Stivelse (oksidert, middels kationisk) ble tilsatt til massen i en mengde på 5% og massen ble omrørt omhyggelig. Lakase (aktivitet 630 U/ml) fortynnet med vann ble tilsatt til blandingen i en mengde på 0,1% av blandingsmengden og massen ble omhyggelig omrørt. Enzymreaksjonen ble tillatt å fortsette i to timer ved en temperatur på 4 0°C. Massen ble omrørt periodisk i løpet av denne tid. Ved slutten av reaksjonen ble massen vasket. Unbleached TMP pulp was washed with deionized water and centrifuged. The mass was buffered with a Na-citrate buffer, diluted to a consistency of 2.5% and heated to 40°C. Starch (oxidized, medium cationic) was added to the mass in an amount of 5% and the mass was thoroughly stirred. Laccase (activity 630 U/ml) diluted with water was added to the mixture in an amount of 0.1% of the mixture amount and the mass was carefully stirred. The enzyme reaction was allowed to proceed for two hours at a temperature of 40°C. The mass was stirred periodically during this time. At the end of the reaction, the mass was washed.
Etter vaskingen ble enzymaktiviteten stoppet med en 10 minutters varmebehandling ved 80-85°C. Til slutt ble massen konsentrert, sentrifugert og homogenisert. After washing, the enzyme activity was stopped with a 10-minute heat treatment at 80-85°C. Finally, the mass was concentrated, centrifuged and homogenized.
100-g ark (SCAN-67) ble fremstilt av massene og arkene ble tumletørket. De papirtekniske egenskaper for arkene ble bestemt i samsvar med SCAN-standarder. 100-g sheets (SCAN-67) were prepared from the pulps and the sheets tumble-dried. The paper technical properties of the sheets were determined in accordance with SCAN standards.
Resultatene som gjengir massens styrke er angitt i Tabell 2. The results that reproduce the strength of the mass are shown in Table 2.
I tillegg til det forsøk som er beskrevet ovenfor (forsøk 2) ble et referanseforsøk (forsøk 1) og to ekstra forsøk (for-søkene 3 og 4) gjennomført. Resultatene av disse er likeledes gjengitt i Tabell 2. Forsøkene ble gjennomført på følgende måte: Forsøk 1 (referanse): Massen ble ikke utsatt for noen enzymbehandling og ingen stivelse ble tilsatt. Med hensyn til vasking av massen og analysene svarte forsøket til det som er beskrevet ovenfor (forsøk 2) . In addition to the trial described above (trial 2), a reference trial (trial 1) and two additional trials (trials 3 and 4) were carried out. The results of these are likewise reproduced in Table 2. The experiments were carried out in the following way: Experiment 1 (reference): The pulp was not exposed to any enzyme treatment and no starch was added. With regard to washing the mass and the analyses, the experiment corresponded to what is described above (experiment 2).
Forsøk 3: Massen ble utsatt for en enzymbehandling etter at pepton, istedetfor stivelse, var blitt tilsatt til reaksjons-oppløsningen i en mengde på 5% av massemengden. I alle andre henseende svarte behandlingen til den som er beskrevet ovenfor (forsøk 2). Prosessen som representeres av dette forsøk hører til innenfor oppfinnelsens ramme. Experiment 3: The pulp was subjected to an enzyme treatment after peptone, instead of starch, had been added to the reaction solution in an amount of 5% of the pulp amount. In all other respects the treatment corresponded to that described above (Experiment 2). The process represented by this experiment belongs within the scope of the invention.
Forsøk 4: Istedetfor en enzymbehandling blir massen utsatt for en oksiderende klordioksidbehandling. Mengden av klordioksid som ble benyttet var 0,1% av massemengden. I alle andre henseende svarte behandlingen til den som er beskrevet ovenfor (forsøk 2). Prosessen som representeres av dette forsøk hører til innenfor oppfinnelsens ramme. Experiment 4: Instead of an enzyme treatment, the pulp is exposed to an oxidizing chlorine dioxide treatment. The amount of chlorine dioxide used was 0.1% of the mass amount. In all other respects the treatment corresponded to that described above (Experiment 2). The process represented by this experiment belongs within the scope of the invention.
Det er åpenbart av resultatene at styrken kan økes på samme måte uavhengig av om oksidasjonsmiddelet er klordioksid eller lakase. Resultatene indikerer også at foruten stivelse kan også pepton bli benyttet sammen med en oksiderende behandling for å øke massestyrken. It is obvious from the results that the strength can be increased in the same way regardless of whether the oxidizing agent is chlorine dioxide or laccase. The results also indicate that, in addition to starch, peptone can also be used together with an oxidizing treatment to increase pulp strength.
Det fremgår av resultatene at den rene tilsetning av stivelse som et bindemiddel øker styrken som ventet, men økningen i styrke var klart større i de tilfelle hvor massen hadde blitt utsatt for den oksiderende behandling som foreslått ved oppf innelsen. It appears from the results that the pure addition of starch as a binder increases the strength as expected, but the increase in strength was clearly greater in the cases where the pulp had been exposed to the oxidizing treatment as proposed in the invention.
Claims (9)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI895930A FI85389C (en) | 1989-12-12 | 1989-12-12 | Process for mass production |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| NO905352D0 NO905352D0 (en) | 1990-12-11 |
| NO905352L NO905352L (en) | 1991-06-13 |
| NO174167B true NO174167B (en) | 1993-12-13 |
| NO174167C NO174167C (en) | 1994-03-23 |
Family
ID=8529501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO905352A NO174167C (en) | 1989-12-12 | 1990-12-11 | Process for the preparation of mechanical pulp, and the use of enzymes and / or chemicals in the production of mechanical pulp |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0433258A1 (en) |
| JP (1) | JPH03260188A (en) |
| CA (1) | CA2031972A1 (en) |
| FI (1) | FI85389C (en) |
| NO (1) | NO174167C (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2082185C (en) * | 1991-11-26 | 2004-01-20 | Alexander R. Pokora | Protease catalyzed treatments of lignocellulose materials |
| DK64092D0 (en) * | 1992-05-18 | 1992-05-18 | Novo Nordisk As | |
| US5480801A (en) * | 1993-09-17 | 1996-01-02 | Novo Nordisk A/S | Purified PH neutral Rhizoctonia laccases and nucleic acids encoding same |
| ES2158951T3 (en) * | 1994-07-26 | 2001-09-16 | Novozymes As | PROCESS TO PREPARE A PRODUCT BASED ON LIGNOCELLULOSE AND PRODUCT OBTAINABLE BY MEANS OF THIS PROCESS. |
| BR9611393A (en) * | 1995-11-08 | 1999-07-13 | Novo Nordisk As | Lignocellulose-based products and process for the manufacture thereof |
| EP0879318B1 (en) | 1996-02-08 | 2002-01-23 | Novozymes A/S | Process for increasing the negative charge on a lignocellulosic material and a modified lignocellulosic material with increased charge density |
| BR0015768B1 (en) * | 1999-11-19 | 2009-08-11 | paper or cardboard making method and paper making apparatus. | |
| US6939437B1 (en) | 1999-11-19 | 2005-09-06 | Buckman Laboratories International, Inc. | Paper making processes using enzyme and polymer combinations |
| AU779711B2 (en) * | 2000-02-09 | 2005-02-10 | Akzo Nobel N.V. | Pulping process |
| FI20012375A0 (en) * | 2001-12-03 | 2001-12-03 | Dynea Chemicals Oy | Process for making pressed layer structures |
| FI20031904A (en) * | 2003-12-23 | 2005-06-24 | Kemira Oyj | Process for modifying a lignocellulosic product |
| US8317975B2 (en) | 2004-04-20 | 2012-11-27 | The Research Foundation Of The State University Of New York | Product and processes from an integrated forest biorefinery |
| CN101171386B (en) | 2005-05-04 | 2011-11-16 | 诺维信北美公司 | Chlorine dioxide treatment composition and method |
| DE102008020642A1 (en) * | 2008-04-24 | 2009-10-29 | Kronotec Ag | Process for the production of wood-based materials and wood-based materials |
| EP4127313A1 (en) | 2020-03-26 | 2023-02-08 | MetGen Oy | Method for making moisture-resistant paper |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NZ216726A (en) * | 1985-07-15 | 1990-08-28 | Repligen Corp | Use of lignin-degrading enzymes from phanerochaete chrysosporium for treatment of wood pulp and e1 effluent |
| DE3636208A1 (en) * | 1986-10-24 | 1988-05-05 | Call Hans Peter | METHOD FOR DELIGNIFYING AND WHICH BLEACHING LIGNICELLULOSE-CONTAINING OR LIGNINAL MATERIAL OR LIGNIN BY ENZYMATIC TREATMENT |
-
1989
- 1989-12-12 FI FI895930A patent/FI85389C/en active IP Right Grant
-
1990
- 1990-12-11 EP EP90850402A patent/EP0433258A1/en not_active Withdrawn
- 1990-12-11 NO NO905352A patent/NO174167C/en unknown
- 1990-12-11 CA CA002031972A patent/CA2031972A1/en not_active Abandoned
- 1990-12-12 JP JP2415715A patent/JPH03260188A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03260188A (en) | 1991-11-20 |
| NO905352L (en) | 1991-06-13 |
| FI85389C (en) | 1992-04-10 |
| EP0433258A1 (en) | 1991-06-19 |
| NO174167C (en) | 1994-03-23 |
| FI895930A (en) | 1991-06-13 |
| CA2031972A1 (en) | 1991-06-13 |
| FI895930A0 (en) | 1989-12-12 |
| NO905352D0 (en) | 1990-12-11 |
| FI85389B (en) | 1991-12-31 |
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