EP0421843A1 - Process for treating a papermaking pulp with an enzymatic preparation to make paper or cardboard - Google Patents

Process for treating a papermaking pulp with an enzymatic preparation to make paper or cardboard Download PDF

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EP0421843A1
EP0421843A1 EP90402657A EP90402657A EP0421843A1 EP 0421843 A1 EP0421843 A1 EP 0421843A1 EP 90402657 A EP90402657 A EP 90402657A EP 90402657 A EP90402657 A EP 90402657A EP 0421843 A1 EP0421843 A1 EP 0421843A1
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Prior art keywords
paper pulp
paper
treating
degree
pulp
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German (de)
French (fr)
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EP0421843B1 (en
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Jean-Luc Fuentes
Christian Rousset
Gérard Goma
Jean-Claude Pommier
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Smurfit Kappa Cellulose du Pin SAS
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Cellulose du Pin SA
Smurfit Cellulose du Pin SAS
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    • 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

Definitions

  • the present invention relates to the paper industry and in particular the recycled paper industry and more specifically relates to a new process for treating paper pulp by means of an enzymatic preparation, allowing in particular good machinability of said pulp during the paper making.
  • Pasta in aqueous suspension ready to be put in opens on a paper machine can be characterized by various parameters, and one of them is particularly significant for predicting the suitability of the dough for draining.
  • the Schopper-Riegler (SA) degree of a pulp is thus defined as being an element of appreciation of the quality of a pulp for the manufacture of paper. It expresses the ability of water to separate from the suspension under the conditions defined by standard NFQ 50 003. On a scale ranging from 0 to 100, a high value of SR indicates a low speed of drainage of the suspension while a low value indicates a faster drip speed. It has been observed, for example, that a dough which has undergone a refining operation has its SR more or less increased according to the degree of refining undergone, compared to a dough which has had little or no such operation.
  • This parameter plays a particularly important role in the productivity of the paper machine.
  • the draining phase must take as little time as possible.
  • the enzymatic preparations containing cellulases and / or hemicellulases described are preferably those which have a C1 activity, a C x activity and a xylanasic activity. These three activities are defined by the international nomenclature of enzymes and they can be qualified and expressed in units of the international system per milligram of powder of the enzyme preparation considered.
  • the activity C Cont is the action of cellobiohydrolase which can be assayed on very organized pure cellulose. This activity is manifested by the production of cellobiose and the international system has retained the AVICEL substrate as the reference substrate.
  • the activity C x is assayed on modified cellulose, carboxymethylcellulose and it is quantified by a drop in the viscosity of the carboxymethylcellulose or an increase in the reducing ends.
  • the xylanasic activity allows hydrolysis of the binding xylans.
  • the reaction medium may be more or less suitable for the action of enzymes. Temperature and pH conditions are more particularly suitable for avoiding any risk of denaturation of the enzymes by the medium.
  • the pH is thus advantageously between 3 and 7, and the temperature between 20 ° C and 60 ° C. Above 60 ° C, the medium tends to denature the enzyme, and below 20 ° C, the action of the enzymes manifests itself particularly slowly.
  • Certain papermaking compositions of recycled fibers may have a high pH and greater than 7. In this case, it may be necessary to lower the pH in order to be in the optimal conditions of action of the enzymatic preparations.
  • the reduction in pH is generally effected by the addition of acid such as sulfuric acid.
  • acid such as sulfuric acid.
  • the addition of an acid can cause disturbances in the formation of the sheet on the paper machine, for example reducing the effectiveness of certain agents such as retention agents. .
  • the invention overcomes the disadvantages mentioned.
  • the method according to the invention consists in using, with a view to lowering the SR of paper compositions, in particular based on recycled fibers, having an SR greater than 25, enzymatic preparations containing so-called alkaline cellulases, chosen from those produced by fermentation. of the fungus Humicola insolens and those produced by the bacteria Cellulomonas .
  • alkaline cellulases preferably used are those obtained from strains deposited with an international depositary authority for microorganisms and referenced CBS 39 269, CBS 14 764, ATCC 16 454, ATCC 26 908, ATCC 34 627 for the fungus Humicola insolens and UDA 8,200, FIMI 11,341 , UDA 11,494 for the bacterium Cellulomonas .
  • All these cellulases have a higher CMC activity (C x ) and filter paper activity at pH 7 or 9 than at pH 5.
  • the filter paper activity corresponds to the measurement of the reducing sugars released by the action of the enzyme preparation from the filter paper (WHATMAN filter paper).
  • a paper pulp in particular a paper pulp based on recycled fibers, is treated with an enzymatic preparation having a maximum activity expressed in relation to lowering the SR degree for pH values greater than 6.
  • the enzymatic preparations according to the invention can be used at concentrations of between 0.01% to 2% by weight of the paper pulp expressed dry.
  • the paper compositions in aqueous suspensions are used on a conventional paper machine which comprises - a manufacturing table provided with a box providing a jet of pulp in aqueous suspension for the forming a sheet of paper, the manufacturing table being covered with a canvas for draining the dough, - a press section, - a drying section.
  • An aqueous suspension of a paper pulp based on recycled fibers is prepared as follows:
  • the procedure is as in the previous examples except that the enzyme preparation is changed, here using a powder based on cellulases designated under the name Celluzyme R 0.7 T by the company NOVO.
  • the procedure is as in Examples 6, 8 and 10 respectively, using an enzymatic preparation based on cellulases derived from the strain CBS 14 764 of the fungus Humicola insolens .
  • the enzyme preparation is obtained as follows:
  • the strain as supplied by the international depositary authority Centraalbureau Voor Schimmelrcultures (CBS) is transferred into a sterile medium containing cellulose, at pH 6. After 7 days of culture at 40 ° C, the mycelium is separated from the medium fermentation by filtration. The filtrate obtained is lyophilized so as to obtain a powder which can be used in an amount of 0.01 to 2% by weight, of the dry weight of the paper pulp to be treated.
  • the procedure is as in Examples 6, 8 and 10 respectively, using an enzymatic preparation based on cellulases originating from the strain UDA 11 494 of the bacteria Cellulomonas .
  • the enzyme preparation is obtained as follows:
  • the strain as supplied by the international depositary authority is transferred to a sterile medium containing cellulose, at pH 7. After 7 days of culture at 25 ° C., the cells are separated from the fermentation medium by filtration. The filtrate is lyophilized so as to obtain a powder which can be used in an amount of 0.01 to 2% by weight of the dry weight of the paper pulp to treat.
  • the figures in the appendix show the variations in the degree SR as a function of the pH for the three temperatures according to examples 1 to 30 and 37 to 51.
  • SR is the difference in the Shopper degrees of pulp measured before and after the enzymatic treatment.
  • the graphs show the good reactivity of the enzymes used according to the invention for pH values greater than 6 whereas, for the enzyme preparations used in the prior art, this reactivity decreases sharply for pH values greater than 6. It may also be noted the unexpected effectiveness of the enzyme preparations according to the invention when the treatment is carried out at 30 ° C.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
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  • Enzymes And Modification Thereof (AREA)
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Abstract

The invention relates to a process for treating a papermaking pulp with an enzymatic preparation. <??>According to the process, an enzymatic preparation containing cellulases and/or hemicellulases, chosen from those derived from the fungus Humicola insolens and from the bacterium Cellulomonas, is reacted with an aqueous suspension of the abovementioned pulp possessing a number of degrees Schopper-Riegler (SR), determined in accordance with Standard NFQ 50 003, equal to at least 25. <??>Application of the process for treating a papermaking pulp based on recycled fibres, possessing a pH equal to at least 5. <IMAGE>

Description

La présente invention concerne l'industrie papetière et notamment l'industrie du papier recyclé et elle a plus précisément pour objet un nouveau procédé de traitement de pâtes papetières au moyen d'une préparation enzymatique, permettant notamment une bonne machinabilité de ladite pâte lors de la fabrication du papier.The present invention relates to the paper industry and in particular the recycled paper industry and more specifically relates to a new process for treating paper pulp by means of an enzymatic preparation, allowing in particular good machinability of said pulp during the paper making.

L'industrie papetière utilise de plus en plus de pa­piers recyclés. Dans la fabrication du carton ondulé par exemple, on fait de plus en plus appel à des matières pre­mières à base de fibres recyclées, et on augmente parallè­lement le nombre des recyclages. Or, à chaque recyclage, la qualité des matières premières se dégrade davantage. Pour retrouver un niveau satisfaisant des caractéristiques mé­caniques, on procède alors généralement à un raffinage des pâtes en suspension aqueuse, ce qui entraîne des difficul­tés de machinabilité, en particulier d'égouttabilité de la composition papetière.The paper industry is using more and more recycled paper. In the manufacture of corrugated cardboard for example, there is an increasing use of raw materials based on recycled fibers, and the number of recycles is increased in parallel. However, with each recycling, the quality of the raw materials deteriorates further. To find a satisfactory level of mechanical characteristics, a refining of the pulps in aqueous suspension is then generally carried out, which gives rise to difficulties in terms of processability, in particular of drainability of the paper composition.

Les pâtes en suspension aqueuse prêtes à être mises en ouvre sur une machine à papier peuvent être caractérisées par divers paramètres, et l'un d'entre eux est particuliè­rement significatif pour la prévision de l'aptitude de la pâte à l'égouttage. On définit ainsi le degré Schopper-­Riegler (SA) d'une pâte comme étant un élément d'apprécia­tion de la qualité d'une pâte pour la fabrication du pa­pier. Il exprime l'aptitude de l'eau à se séparer de la suspension dans les conditions définies par la norme NFQ 50 003. Sur une échelle allant de 0 à 100, une valeur élevée du SR traduit une faible vitesse d'égouttage de la suspen­sion tandis qu'une valeur faible traduit une vitesse d'égouttage plus rapide. On a observé par exemple qu'une pâte qui a subi une opération de raff inage voit son SR plus ou moins augmenté selon le degré de raff inage subi, par rapport à une pâte qui n'a pas ou peu subi une telle opé­ration.Pasta in aqueous suspension ready to be put in opens on a paper machine can be characterized by various parameters, and one of them is particularly significant for predicting the suitability of the dough for draining. The Schopper-Riegler (SA) degree of a pulp is thus defined as being an element of appreciation of the quality of a pulp for the manufacture of paper. It expresses the ability of water to separate from the suspension under the conditions defined by standard NFQ 50 003. On a scale ranging from 0 to 100, a high value of SR indicates a low speed of drainage of the suspension while a low value indicates a faster drip speed. It has been observed, for example, that a dough which has undergone a refining operation has its SR more or less increased according to the degree of refining undergone, compared to a dough which has had little or no such operation.

Ce paramètre joue un rôle particulièrement important dans la productivité de la machine à papier. En effet, pour augmenter la productivité, il faut que la phase d'égouttage prenne le moins de temps possible. Pour des suspensions avec un degré SR élevé, on est obligé d'augmenter la con­centration des pâtes pour conserver une même cadence de fabrication. Cela entraine une moins bonne formation des feuilles car les fibres se répartissent plus difficilement. Il est donc particulièrement avantageux de disposer de suspensions présentant un degré SR assez faible.This parameter plays a particularly important role in the productivity of the paper machine. In fact, to increase productivity, the draining phase must take as little time as possible. For suspensions with a high SR degree, it is necessary to increase the concentration of the pastes to maintain the same production rate. This results in poorer leaf formation because the fibers are more difficult to distribute. It is therefore particularly advantageous to have suspensions having a fairly low SR degree.

Dès que des suspensions présentent un degré SR supé­rieur à 25, il devient soubaitable d'essayer de le faire baisser pour améliorer les conditions de fabrication du papier. Un tel abaissement est souhaitable suivant deux aspects : d'une part, on peut améliorer la productivité de la machine à papier grâce à l'accélération de l'égouttage ; d'autre part, on peut conserver les cadences de fabrication sans avoir à compenser la lenteur de l'égouttage par une moindre dilution de la suspension, avec les risques que cela entrainerait d'une mauvaise formation des feuilles.As soon as suspensions have an SR degree greater than 25, it becomes advisable to try to lower it to improve the conditions for papermaking. Such a reduction is desirable according to two aspects: on the one hand, the productivity of the paper machine can be improved thanks to the acceleration of the drainage; on the other hand, the production rates can be kept without having to compensate for the slow drainage by a lesser dilution of the suspension, with the risks that this would entail poor formation of the sheets.

Dans la publication de brevet européen 0 262 040, on a décrit un procédé de traitement de pâtes papetières en suspension aqueuse, notamment des pâtes à base de fibres recyclées, possédant un degré SR au moins égal à 25 qui, par utilisation de préparations enzymatiques à base de cellulases et/ou d'hémicellulases, permet d'abaisser le SR et donc d'améliorer l'égouttage de la suspension et la productivité de la machine à papier.In European patent publication 0 262 040, a process for treating pulp in aqueous suspension, in particular pulp based on fibers, has been described. recycled, having an SR degree at least equal to 25 which, by using enzymatic preparations based on cellulases and / or hemicellulases, makes it possible to lower the SR and therefore to improve the drainage of the suspension and the productivity of the paper machine.

Les préparations enzymatiques contenant des cellulases et/ou des hémicellulases décrites sont de préférence celles qui possèdent une activité C₁, une activité Cx et une ac­tivité xylanasique. Ces trois activités sont définies par la nomenclature internationale des enzymes et elles peuvent être qualifiées et exprimées en unités du système interna­tional par milligramme de poudre de la préparation enzyma­tique considérée. L'activité C₁ est l'action de la cellob­iohydrolase pouvant être dosée sur de la cellulose pure très organisée. Cette activité se manifeste par la produc­tion de cellobiose et le système international a retenu le substrat AVICEL comme substrat de référence. L'activité Cx est dosée sur de la cellulose modifiée, la carboxy­méthylcellulose et elle est quantifiée par une chute de la viscosité de la carboxyméthylcellulose ou une augmentation des extrémités réductrices. L'activité xylanasique permet une hydrolyse des xylanes de liaison.The enzymatic preparations containing cellulases and / or hemicellulases described are preferably those which have a C₁ activity, a C x activity and a xylanasic activity. These three activities are defined by the international nomenclature of enzymes and they can be qualified and expressed in units of the international system per milligram of powder of the enzyme preparation considered. The activity Cactivité is the action of cellobiohydrolase which can be assayed on very organized pure cellulose. This activity is manifested by the production of cellobiose and the international system has retained the AVICEL substrate as the reference substrate. The activity C x is assayed on modified cellulose, carboxymethylcellulose and it is quantified by a drop in the viscosity of the carboxymethylcellulose or an increase in the reducing ends. The xylanasic activity allows hydrolysis of the binding xylans.

Comme décrit dans le document cité, le milieu réactionnel peut être plus ou moins approprié à l'action des enzymes. Des conditions de température et de pH con­viennent plus particulièrement pour éviter tout risque de dénaturation des enzymes par le milieu. Le pH est ainsi avantageusement compris entre 3 et 7, et la température entre 20°C et 60°C. Au delà de 60°C, le milieu tend à dé­naturer l'enzyme, et en dessous de 20°C, l'action des en­zymes se manifeste particulièrement lentement.As described in the cited document, the reaction medium may be more or less suitable for the action of enzymes. Temperature and pH conditions are more particularly suitable for avoiding any risk of denaturation of the enzymes by the medium. The pH is thus advantageously between 3 and 7, and the temperature between 20 ° C and 60 ° C. Above 60 ° C, the medium tends to denature the enzyme, and below 20 ° C, the action of the enzymes manifests itself particularly slowly.

Avec les préparations enzymatiques décrites dans ce document, il est recommandé de se placer à un pH compris entre 3 et 7 environ.With the enzymatic preparations described in this document, it is recommended to place yourself at a pH between 3 and 7 approximately.

Certaines compositions papetières de fibres recyclées peuvent présenter un pH élevé et supérieur à 7. Dans ce cas, on peut être amené à diminuer le pH pour se situer dans les conditions optimales d'action des préparations enzymatiques.Certain papermaking compositions of recycled fibers may have a high pH and greater than 7. In this case, it may be necessary to lower the pH in order to be in the optimal conditions of action of the enzymatic preparations.

La diminution du pH s'effectue généralement par addi­tion d'acide tel l'acide sulfurique. Outre l'inconvénient d'être une opération supplémentaire, l'addition d'un acide peut provoquer des perturbations au niveau de la formation de la feuille sur la machine à papier, par exemple diminuer l'efficacité de certains agents tels les agents de réten­tion.The reduction in pH is generally effected by the addition of acid such as sulfuric acid. In addition to the drawback of being an additional operation, the addition of an acid can cause disturbances in the formation of the sheet on the paper machine, for example reducing the effectiveness of certain agents such as retention agents. .

De plus, dans le cas des papiers impression-écriture par exemple, il est nécessaire d'ajouter une quantité im­portante d'acide ce qui diminue l'intérêt économique du procédé de traitement par les enzymes.In addition, in the case of printing-writing papers for example, it is necessary to add a large amount of acid which decreases the economic advantage of the enzyme treatment process.

L'invention obvie aux inconvénients cités.The invention overcomes the disadvantages mentioned.

On a maintenant trouvé selon l'invention des prépara­tions enzymatiques à base de cellulases et/ou d'hémicel­lulases qui ne nécessitent pas de modifications du procédé de formage de la feuille et qui peuvent être utilisées à des pH supérieurs aux pH utilisés jusqu'à présent.We have now found, according to the invention, enzymatic preparations based on cellulases and / or hemicellulases which do not require modifications to the sheet forming process and which can be used at pH values higher than the pH used up to now. .

Le procédé selon l'invention consiste à utiliser en vue d'abaisser le SR des compositions papetières, notamment à base de fibres recyclées, présentant un SR supérieur à 25, des préparations enzymatiques contenant des cellulases dites alcalines, choisies parmi celles produites par la fermentation du champignon Humicola insolens et celles produites par la bactérie Cellulomonas.The method according to the invention consists in using, with a view to lowering the SR of paper compositions, in particular based on recycled fibers, having an SR greater than 25, enzymatic preparations containing so-called alkaline cellulases, chosen from those produced by fermentation. of the fungus Humicola insolens and those produced by the bacteria Cellulomonas .

Les cellulases alcalines utilisées de préférence sont celles obtenues à partir des souches déposées à une auto­rité de dépôt international de micro-organismes et réfé­rencées CBS 39 269, CBS 14 764, ATCC 16 454, ATCC 26 908, ATCC 34 627 pour le champignon Humicola insolens et UDA 8 200, FIMI 11 341, UDA 11 494 pour la bactérie Cellulomonas.The alkaline cellulases preferably used are those obtained from strains deposited with an international depositary authority for microorganisms and referenced CBS 39 269, CBS 14 764, ATCC 16 454, ATCC 26 908, ATCC 34 627 for the fungus Humicola insolens and UDA 8,200, FIMI 11,341 , UDA 11,494 for the bacterium Cellulomonas .

Toutes ces cellulases présentent une activité CMC (Cx) et une activité papier filtre plus élevées à pH 7 ou 9 qu'à pH 5. L'activité papier filtre correspond à la mesure des sucres réducteurs libérés par l'action de la préparation enzymatique à partir du papier filtre (papier filtre WHATMAN).All these cellulases have a higher CMC activity (C x ) and filter paper activity at pH 7 or 9 than at pH 5. The filter paper activity corresponds to the measurement of the reducing sugars released by the action of the enzyme preparation from the filter paper (WHATMAN filter paper).

Sous un des aspects de l'invention, on traite une pâte papetière notamment une pâte papetière à base de fibres recyclées, par une préparation enzymatique présentant une activité maximale exprimée par rapport à l'abaissement du degré SR pour des valeurs de pH supérieures à 6.In one aspect of the invention, a paper pulp, in particular a paper pulp based on recycled fibers, is treated with an enzymatic preparation having a maximum activity expressed in relation to lowering the SR degree for pH values greater than 6.

Les préparations enzymatiques selon l'invention peu­vent être utilisées à des concentrations comprises entre 0,01 % à 2 % en poids de la pâte papetière exprimés à sec.The enzymatic preparations according to the invention can be used at concentrations of between 0.01% to 2% by weight of the paper pulp expressed dry.

On peut aussi utiliser dans le cadre de l'invention, des préparations enzymatiques désignées sous l'appellation Celluzyme R par la société NOVO, qui contiennent des cellulases produites par la fermentation du champignon Humicola insolens.It is also possible to use, within the framework of the invention, enzymatic preparations designated under the name Celluzyme R by the company NOVO, which contain cellulases produced by the fermentation of the fungus Humicola insolens .

Après le traitement par les préparations enzymatiques selon l'invention, les compositions papetières en suspen­sions aqueuses sont mises en oeuvre sur une machine à pa­pier usuelle qui comprend - une table de fabrication munie d'une caisse apportant un jet de pâte en suspension aqueuse pour la formation d'une feuille de papier, la table de fa­brication étant recouverte d'une toile pour l'égouttage de la pâte, - une section de presse, - une section de séchage.After the treatment with the enzymatic preparations according to the invention, the paper compositions in aqueous suspensions are used on a conventional paper machine which comprises - a manufacturing table provided with a box providing a jet of pulp in aqueous suspension for the forming a sheet of paper, the manufacturing table being covered with a canvas for draining the dough, - a press section, - a drying section.

D'autres caractéristiques et avantages de l'invention apparaitront au cours de la description détaillée suivante d'exemples de réalisation.Other characteristics and advantages of the invention will appear during the following detailed description of exemplary embodiments.

Dans tous les exemples rapportés, les caractéristiques indiquées sont définies de la façon suivante :
- degré Schopper-Rieger (SR) : conformément à la norme NFQ 50 003 (mesuré sur une pâte en suspension homogène à 2 g/l)In all the examples reported, the characteristics indicated are defined as follows:
- Schopper-Rieger degree (SR): in accordance with standard NFQ 50 003 (measured on a paste in homogeneous suspension at 2 g / l)

Exemples 1 A 15 :Examples 1 to 15:

On prépare une suspension aqueuse d'une pâte papetière à base de fibres recyclées de la façon suivante :An aqueous suspension of a paper pulp based on recycled fibers is prepared as follows:

On pèse 1 kg sec d'une pâte constituée uniquement de fibres en provenance de caisses en carton recyclées. On en fait une suspension aqueuse à 3 % en poids en ajoutant de l'eau jusqu'à un poids total de 33,333 kg. On ajuste le pH, pour obtenir un pH de 5, 6, 7, 8, 9 selon les exemples, puis on porte la suspension fibreuse à la température dé­sirée de 50, 40 ou 30°C selon les exemples. Une fois cette température atteinte, on introduit 3 g d'une poudre à base de cellulases désignée sous l'appellation Celluzyme R 1500T par la société NOVO. On laisse réagir les enzymes sous agitation pendant 1/2 heure. On dilue la suspension aqueuse par addition d'eau pour obtenir une suspension à 7 g/l et on mesure le degré SR. Les valeurs obtenues sont indiquées dans le tableau ci-après. On réalise ainsi 15 exemples différents par la température et le pH.Weigh 1 kg dry of a pulp made entirely of fibers from recycled cardboard boxes. It is made into an aqueous suspension at 3% by weight by adding water to a total weight of 33.333 kg. The pH is adjusted to obtain a pH of 5, 6, 7, 8, 9 according to the examples, then the fibrous suspension is brought to the desired temperature of 50, 40 or 30 ° C according to the examples. Once this temperature has been reached, 3 g of a cellulase-based powder designated under the name Celluzyme R 1500T by the company NOVO are introduced. The enzymes are allowed to react under stirring for 1/2 hour. The aqueous suspension is diluted by adding water to obtain a suspension at 7 g / l and the SR degree is measured. The values obtained are indicated in the table below. 15 different examples are thus produced by temperature and pH.

Exemples 16 à 30 :Examples 16 to 30:

On opère comme dans les exemples précédents sauf qu'on change la préparation enzymatique, en utilisant ici une poudre à base de cellulases désignée sous l'appellation Celluzyme R 0,7 T par la société NOVO.The procedure is as in the previous examples except that the enzyme preparation is changed, here using a powder based on cellulases designated under the name Celluzyme R 0.7 T by the company NOVO.

Exemples 31 à 33 :Examples 31 to 33:

On opère comme dans les exemples 6, 8 et 10 respecti­vement, en utilisant une préparation enzymatique à base de cellulases issues de la souche CBS 14 764 du champignon Humicola insolens.The procedure is as in Examples 6, 8 and 10 respectively, using an enzymatic preparation based on cellulases derived from the strain CBS 14 764 of the fungus Humicola insolens .

La préparation enzymatique est obtenue de la façon suivante :The enzyme preparation is obtained as follows:

La souche telle que fournit par l'autorité de dépôt internationale Centraalbureau Voor Schimmelrcultures (CBS) est transférée dans un milieu stérile contenant de la cel­lulose, à un pH 6. Après 7 jours de culture à 40°C, le my­celium est séparé du milieu de fermentation par filtration. Le filtrat obtenu est lyophilisé de manière à obtenir une poudre que l'on peut employer à raison de 0,01 à 2 % en poids, du poids en sec de la pâte papetière à traiter.The strain as supplied by the international depositary authority Centraalbureau Voor Schimmelrcultures (CBS) is transferred into a sterile medium containing cellulose, at pH 6. After 7 days of culture at 40 ° C, the mycelium is separated from the medium fermentation by filtration. The filtrate obtained is lyophilized so as to obtain a powder which can be used in an amount of 0.01 to 2% by weight, of the dry weight of the paper pulp to be treated.

Exemples 34 à 36 :Examples 34 to 36:

On opère comme dans les exemples 6, 8 et 10 respecti­vement, en utilisant une préparation enzymatique à base de cellulases issues de la souche UDA 11 494 de la bactérie Cellulomonas.The procedure is as in Examples 6, 8 and 10 respectively, using an enzymatic preparation based on cellulases originating from the strain UDA 11 494 of the bacteria Cellulomonas .

La préparation enzymatique est obtenue de la façon suivante :The enzyme preparation is obtained as follows:

La souche telle que fournit pâr l'autorité de dépôt internationale est transférée dans un milieu stérile con­tenant de la cellulose, à pH 7. Après 7 jours de culture à 25°C, les cellules sont séparées du milieu de fermentation par filtration. Le filtrat est lyophilisé de manière à ob­tenir une poudre que l'on peut employer à raison de 0,01 à 2 % en poids du poids en sec de la pâte papetière à traiter.The strain as supplied by the international depositary authority is transferred to a sterile medium containing cellulose, at pH 7. After 7 days of culture at 25 ° C., the cells are separated from the fermentation medium by filtration. The filtrate is lyophilized so as to obtain a powder which can be used in an amount of 0.01 to 2% by weight of the dry weight of the paper pulp to treat.

Exemples comparatifs 37 à 51 :Comparative examples 37 to 51:

On opère comme dans les exemples précédents sauf qu'on remplace les préparations enzymatiques selon l'invention par une préparation enzymatique commercialisée sous la ré­férence Maxazyme R CL 2000 par la société Rapidase qui est une préparation dérivée du microorganisme Trichoderma viride et décrite dans la publication de brevet européen déjà cité EP 0 262 040.The procedure is as in the previous examples except that the enzymatic preparations according to the invention are replaced by an enzymatic preparation marketed under the reference Maxazyme R CL 2000 by the company Rapidase which is a preparation derived from the microorganism Trichoderma viride and described in the publication of European patent already cited EP 0 262 040.

L'exemple témoin suivant sur le tableau n'utilise au­cune préparation enzymatique.The following control example on the table does not use any enzyme preparation.

Pour mieux mettre en évidence la réactivité des pré­parations enzymatiques selon l'invention, on a représenté sur les figures en annexe, les variations du degré SR en fonction du pH pour les trois températures selon les exem­ples 1 à 30 et 37 à 51. SR est la différence des degrés Shopper des pâtes papetières mesurées avant et après le traitement enzymatique.To better demonstrate the reactivity of the enzyme preparations according to the invention, the figures in the appendix show the variations in the degree SR as a function of the pH for the three temperatures according to examples 1 to 30 and 37 to 51. SR is the difference in the Shopper degrees of pulp measured before and after the enzymatic treatment.

Les graphiques montrent les bonnes réactivité des en­zymes utilisées selon l'invention pour des pH supérieurs à 6 alors que, pour les préparations enzymatiques utilisées dans l'art antérieur, cette réactivité décroît fortement pour des valeurs de pH supérieurs à 6. On peut encore noter l'efficacité inattendue des préparations enzymatiques selon l'invention lorsqu'on effectue le traitement à 30°C.The graphs show the good reactivity of the enzymes used according to the invention for pH values greater than 6 whereas, for the enzyme preparations used in the prior art, this reactivity decreases sharply for pH values greater than 6. It may also be noted the unexpected effectiveness of the enzyme preparations according to the invention when the treatment is carried out at 30 ° C.

L'action des enzymes va se traduire sur la machine à papier par une amélioration de l'égouttabilité et une aug­mentation de la vitesse de la machine. Elle permet une di­lution plus importante de la composition papetière en caisse de tête. TABLEAU Ex. t°C pH SR SR Ex. t°C pH SR SR 1 50 5 39,5 4,5 26 30 5 40,5 3,5 2 50 6 34 10 27 30 6 39,5 4,5 3 50 7 34 10 28 30 7 38,5 5,5 4 50 8 33 11 29 30 8 39,5 4,5 5 50 9 36,5 7,5 30 30 9 39,5 4,5 6 40 5 40 4 31 40 5 42 2 7 40 6 36 8 32 40 7 39 5 8 40 7 35,5 8,5 33 40 9 39 4 9 40 8 35,5 8,5 34 40 5 40 4 10 40 9 38 6 35 40 7 34 10 11 30 5 42 2 36 40 9 34 8 12 30 6 39,5 4,5 Comp. 13 30 7 37,5 6,5 37 50 5 32 12 14 30 8 40 4 38 50 6 33 11 15 30 9 41 3 39 50 7 38 6 16 50 5 40 4 40 50 8 43,5 0,5 17 50 6 36,5 7,5 41 50 9 44 0 18 50 7 35 9 42 40 5 37 7 19 50 8 35 9 43 40 6 37 7 20 50 9 38,5 5,5 44 40 7 38 6 21 40 5 41,5 2,5 45 40 8 42,5 1,5 22 40 6 40 4 46 40 9 44 0 23 40 7 36 8 47 30 5 41,5 2,5 24 40 8 37,5 6,5 48 30 6 42 2 25 40 9 40,5 3,5 49 30 7 43 1 50 30 8 44 0 51 30 9 44 0 Tem. 44 0 The action of the enzymes will translate on the paper machine by an improvement of the drainability and an increase in the speed of the machine. It allows a greater dilution of the paper composition in the headbox. BOARD Ex. t ° C pH SR SR Ex. t ° C pH SR SR 1 50 5 39.5 4.5 26 30 5 40.5 3.5 2 50 6 34 10 27 30 6 39.5 4.5 3 50 7 34 10 28 30 7 38.5 5.5 4 50 8 33 11 29 30 8 39.5 4.5 5 50 9 36.5 7.5 30 30 9 39.5 4.5 6 40 5 40 4 31 40 5 42 2 7 40 6 36 8 32 40 7 39 5 8 40 7 35.5 8.5 33 40 9 39 4 9 40 8 35.5 8.5 34 40 5 40 4 10 40 9 38 6 35 40 7 34 10 11 30 5 42 2 36 40 9 34 8 12 30 6 39.5 4.5 Comp. 13 30 7 37.5 6.5 37 50 5 32 12 14 30 8 40 4 38 50 6 33 11 15 30 9 41 3 39 50 7 38 6 16 50 5 40 4 40 50 8 43.5 0.5 17 50 6 36.5 7.5 41 50 9 44 0 18 50 7 35 9 42 40 5 37 7 19 50 8 35 9 43 40 6 37 7 20 50 9 38.5 5.5 44 40 7 38 6 21 40 5 41.5 2.5 45 40 8 42.5 1.5 22 40 6 40 4 46 40 9 44 0 23 40 7 36 8 47 30 5 41.5 2.5 24 40 8 37.5 6.5 48 30 6 42 2 25 40 9 40.5 3.5 49 30 7 43 1 50 30 8 44 0 51 30 9 44 0 Tem. 44 0

Claims (9)

1. Procédé de traitement d'une pâte papetière, notam­ment une pâte papetière à base de fibres recyclées, dans lequel on fait agir sur une suspension aqueuse de ladite pâte papetière présentant un degré Schopper-Riegler (SR), déterminé conformément à la norme NFQ 50 003 au moins égal à 25, en vue d'abaisser ce degré SR, une préparation enzymatique contenant des cellulases et/ou des hémicellulases, caractérisé en ce qu'on utilise une prépa­ration enzymatique contenant des enzymes choisies parmi celles dérivées du champignon Humicola insolens et de la bactérie Cellulomonas.1. Process for treating a paper pulp, in particular a paper pulp based on recycled fibers, in which an aqueous suspension of said paper pulp having a Schopper-Riegler (SR) degree is determined, determined in accordance with the NFQ standard 50 003 at least equal to 25, with a view to lowering this SR degree, an enzyme preparation containing cellulases and / or hemicellulases, characterized in that an enzyme preparation containing enzymes chosen from those derived from the fungus Humicola insolens is used and Cellulomonas bacteria. 2. Procédé selon la revendication 1, caractérisé en ce que les enzymes utilisées sont obtenus à partir des souches référencées CBS 39 269, CBS 14 764, ATCC 16 454, ATCC 26 908, ATCC 34 627 pour le champignon Humicola insolens et UDA 8 200, FIMI 11 341, UDA 11 494 pour la bactérie Cellu­lomonas.2. Method according to claim 1, characterized in that the enzymes used are obtained from the strains referenced CBS 39 269, CBS 14 764, ATCC 16 454, ATCC 26 908, ATCC 34 627 for the fungus Humicola insolens and UDA 8 200 , FIMI 11 341, UDA 11 494 for the bacterium Cellulomonas. 3. Procédé selon la revendication 2, caractérisé en ce que les enzymes utilisées sont obtenues à partir dès sou­ches référencées CBS 14 764 et UDA 11 494.3. Method according to claim 2, characterized in that the enzymes used are obtained from strains referenced CBS 14 764 and UDA 11 494. 4. Procédé selon la revendication 1, caractérisé en ce que la préparation enzymatique est choisie parmi les pré­parations commercialisées sous les appellations Celluzyme R 1500 T et Celluzyme R 0,7 T.4. Method according to claim 1, characterized in that the enzymatic preparation is chosen from the preparations marketed under the names Celluzyme R 1500 T and Celluzyme R 0.7 T. 5. Procédé selon une des revendications 1 à 3, carac­térisé en ce que la composition papetière traitée présente un pH compris entre 5 et 9.5. Method according to one of claims 1 to 3, characterized in that the treated paper composition has a pH between 5 and 9. 6. Procédé selon une des revendications 1 à 5, carac­térisé en ce que la température de traitement est comprise entre 20 et 60°C.6. Method according to one of claims 1 to 5, characterized in that the treatment temperature is between 20 and 60 ° C. 7. Procédé selon la revendication 6, caractérisé en ce que la température de traitement est de 30°C environ.7. Method according to claim 6, characterized in that the treatment temperature is approximately 30 ° C. 8. Procédé de traitement d'une pâte papetière, notam­ment une pâte papetière à base de fibres recyclées, carac­térisé en ce qu'on utilise une préparation enzymatique présentant une activité maximale exprimée par rapport à l'abaissement du degré SR de la pâte papetière pour des valeurs de pH supérieures à 6.8. A method of treating a paper pulp, in particular a paper pulp based on recycled fibers, characterized in that an enzymatic preparation is used having a maximum activity expressed in relation to the lowering of the SR degree of the paper pulp for pH values greater than 6. 9. Procédé pour l'amélioration de l'égouttabilité d'une composition papetière, caractérisé en ce qu'on traite la pâte papetière selon une des revendications 1 à 8.9. A method for improving the drainability of a paper composition, characterized in that the paper pulp is treated according to one of claims 1 to 8.
EP90402657A 1989-10-02 1990-09-27 Process for treating a papermaking pulp with an enzymatic preparation to make paper or cardboard Expired - Lifetime EP0421843B1 (en)

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FR8912823 1989-10-02
FR8912823A FR2652595B1 (en) 1989-10-02 1989-10-02 PROCESS FOR TREATING A PAPER PULP WITH AN ENZYMATIC PREPARATION FOR THE MANUFACTURE OF PAPER OR CARDBOARD.

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EP0421843B1 (en) 1994-12-14
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NO904266D0 (en) 1990-10-01
GR3015285T3 (en) 1995-06-30
ES2068360T3 (en) 1995-04-16
FR2652595B1 (en) 1995-03-31
US5116474A (en) 1992-05-26
NO176617B (en) 1995-01-23
ATE115661T1 (en) 1994-12-15
FI101722B1 (en) 1998-08-14
JPH03124891A (en) 1991-05-28
NO904266L (en) 1991-04-03
DE69015095D1 (en) 1995-01-26
FI904843A0 (en) 1990-10-01
NO176617C (en) 1995-05-03

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