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
  • 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
  • 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
  • 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
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control

Definitions

• This invention relates to a process for the manufacture of mechanical wood pulp (such as wood pulp, refiner wood pulp, etc.) and paper containing this wood pulp.
• mechanical wood pulp such as wood pulp, refiner wood pulp, etc.
• Mechanical wood pulp such as sanded wood
• sanded wood is produced by mechanically treating logs or wood chips, for example using a wood grinder or refiner.
• the resulting pulp which has a lower strength as a disadvantage, is obtained in a higher yield, is cheaper and results in a more opaque paper compared to pulp which is produced using chemicals such as alkali, etc.
• the resin components of the mechanical pulp remain unchanged due to the mechanical grinding.
• the wood contains about 1-10% resin components in addition to the main wood components, cellulose, hemicellulose and lignin. These resin components differ qualitatively and quantitatively depending on the type of wood.
• the softwood a main raw material of the mechanical pulp, contains a large amount of resin components such as fatty acids, resin acids, glycerides etc.
• a part of the resin components is excreted from the wood pulp, so that the resins are suspended in water or adsorbed on the fiber surface. That is, they change from a state fixed on the fiber to an excreted (free) state.
• the excreted resin floating in the backwater which is referred to as the "colloidal resin" consists of resin particles approximately 0.2-2 ⁇ m in size.
• paper is manufactured by treating the paper raw materials produced by various processes by sorting processes, adding various additives and forming a sheet by a paper manufacturing machine. In a number of manufacturing processes, the separated resin or the resin adsorbed on the fiber is deposited on tubes, laid paper, sieves, rollers, etc., so that resin difficulty - paper soiling, scrap, etc. - occurs.
• the resin problems often occur with paper containing a large amount of mechanical pulp. So-called “seasoning”, in which the wood is stored outdoors for a long time, serves to avoid resin problems. To avoid resin problems, you can also use surfactants such as polyoxyethylenated alkyl ethers with different degrees of polyoxyethylenation, alkylphenyl derivatives and agents containing them as a main component, as described in Japanese Patent Publication 50-22606.
• surfactants such as polyoxyethylenated alkyl ethers with different degrees of polyoxyethylenation, alkylphenyl derivatives and agents containing them as a main component, as described in Japanese Patent Publication 50-22606.
• the invention is therefore based on the object of providing an improved process for the production of mechanical wood pulp or of paper which contains this wood pulp. Resin difficulties in particular should be reduced.
• the inventors examined both the wood components extracted from Japanese red pine, a typical wood for mechanical wood pulp, and the resin components used in the production of the mechanical wood pulp from Japanese Red pine or the paper containing the mechanical wood pulp has been deposited. It has been found that the major component of the deposited resin is the same as the resin component in the original wood, and that it is rich in triglycerides, fatty acids, resin acids and their metal salts. In particular, the deposited resin always contains a large amount of triglycerides. Therefore, it is believed that triglycerides mainly cause resin problems.
• the invention relates to a method for producing mechanical wood pulp and / or paper containing the mechanical wood pulp and is thereby characterized records that one treats the paper raw material and / or the backwater with an acylglycerol lipase, optionally in immobilized form.
• the acylglycerol lipase used is preferably that which is produced by at least one microorganism from the group Aspergillus niger, Pseudomonas fluorescenz, Pseudomonas fragi, Geotrichum candidum and Candida cylindracea.
• the acylglycerol lipase according to the invention is an enzyme for the hydrolysis of the triglycerides, a main component of the resin.
• suitable acylglycerol lipases are not particularly limited.
• z. B. Use the following: Aspergillus niger, Pseudomonas fluorescens, Pseudumonas fragi, Geotrichum candidum and Candida cylindracea, Mucor javanicus, Rhizopus javanicus, Rhizopus delemar, Rhizopus niveus and fungal strains of the genus Rhizopus.
• the purer the acylglycerol lipase according to the invention the better the effect.
• the acylglycerol lipases used according to the invention can be used alone or in a mixture, and they can also be used with good success in combination with other decomposition enzymes, such as cellulases, hemicellulases, proteases, etc.
• the acylglycerol lipase according to the invention is added in an amount of 0.1-10000 ppm, based on the weight of the mechanical wood pulp, to the sludge of the paper stock which contains the mechanical wood pulp produced when the wood is sanded.
• the sludge obtained is then stirred or left to stand, the temperature preferably being 10-70 ° C., particularly preferably 35-55 ° C.
• the enzyme according to the invention acts weakly and slowly.
• the enzyme according to the invention loses its activity.
• the pH is preferably adjusted to 3-11. Outside this pH range, the activity of the enzyme is reduced. A large amount of water is used in the manufacture of the paper stock and paper, a large part of which is circulated and reused.
• the use of the acylglycerol lipase according to the invention leads to the avoidance of resin problems with this backwater, with the direct addition of an acylglycerol lipase to the backwater, or the addition of a so-called immobilized acylglycerol lipase or a so-called immobilized microorganism. which produces the acylglycerol lipase extracellularly, is used with a good effect.
• the Immobilization of the enzyme or the microorganism can be carried out in a known manner by connection with a carrier, crosslinking, entrapping process, etc. Because the process according to the invention is very selective and mild, it has the advantages that the treated paper raw materials remain unchanged and the usual process is not influenced.
• the cause of the resin difficulties is unclear, but it is believed that the resin difficulties depend on the resin concentration, substance concentration, pH, temperature, metal ion concentration and type.
• the adhesion to the solid surface is attributed to Van der Waal's forces that fix the substances on the solid surface.
• the interaction between the substances is based, among other things, on a hydrophobic bond or a dipole moment effect.
• a hydrophobic or non-polar molecule or such a part of the molecule is attracted to a hydrophobic or non-polar surface.
• a hydrophilic or polar molecule is attracted to a hydrophilic or polar surface.
• the triglycerides appear to play the following role in depositing the resin in a process for making paper stock and paper.
• the triglyceride, a non-polar component of the colloidal resin adheres to a hydro phobic or non-polar surface such as the metal surface of tubes, the surface of press rolls in a papermaking process, etc. due to Van der Waal's forces.
• the adhesive portion acts as a core to which hydrophobic or non-polar molecules or parts of molecules adhere, the resin deposits being formed.
• acylglycerol lipase acts on the non-polar triglyceride, which has high adhesiveness to a hydrophobic and non-polar surface, and which is present in the resin on the surface of the mechanical pulp or in the backwater resin and and colloidal resin.
• the triglycerides are hydrolyzed to water-soluble glycerols and polar fatty acids, which prevents adhesion to hydrophobic metal tubes, laid walls, rollers, etc. Thus, since the adhesion of the resin is prevented from the beginning, no resin deposits are formed, so that the resin trouble is avoided.
• the method of the present invention has the advantages that the deposition of the resin components in the manufacture of the mechanical pulp or the paper containing the mechanical pulp is prevented, and defects such as resin stains and holes in a paper sheet, etc. caused by the resin, be avoided.
• the method of the invention has no adverse impact on paper quality and practical production, and is simple and can be used in the previous pulp and paper making process.
• Fresh Japanese red pine chips were extracted with methanol using a Soxhlet extractor. 10 g of the extract was dissolved in a mixed solution of 100 ml of isopropanol, 60 ml of acetone and 5 ml of water to obtain a resin solution. 10 ml of the resin solution and 0.6 g of aluminum sulfate (as a solid) were introduced into a 1-liter beaker and dispersed with vigorous stirring to form a resin dispersion. In this case the yield of the resin extracted with methanol is 4.7%, based on the dry wood chip weight, this resin containing 37.8% triglycerides. Then the prepared resin dispersion was adjusted to pH 7 using hydrochloric acid and / or sodium hydroxide.
• the acylglycerol lipases were added at different concentrations and at different temperatures, as in Table 1 is shown and stirred for 4 hours to prepare the treated solution.
• the treated solution was adjusted to pH 4 with aluminum sulfate and hydrochloric acid.
• To determine the amount of resin adhering according to the Tapping Routine Control Method RC-324 2.5 cm of a 22 cm wide and 7 cm long polyethylene board was immersed in the solution. The adjusted solution was stirred for 30 minutes using a vibromixer (linitator, manufactured by US Heidon Co.). Then the polyethylene board was extracted and dried. The amount of adhesive resin was calculated and expressed as a percentage based on the amount of adhesive resin in the untreated sample.
• the resin dispersion prepared in Example 1 was adjusted to a pH of 7 using hydrochloric acid and / or sodium hydroxide.
• the acylglycerol lipase was added in an amount of 500 ppm based on the resin weight and stirred at 40 ° C.
• the amount of adhesive resin was calculated in the same manner as in Example 1; it is shown in Table 2.
• Table 2 enzyme time Art concentration 2 hours. 4 hours 8 hours Untreated - 105 mg 101 mg 107 mg (100%) (100%) (100%) Li. OF 500 ppm 67 mg 31 mg 31 mg (63.8%) (30.7%) (24.4%) Li. GC-5 5) 500 ppm 85 mg 70 mg 59 mg (81.0%) (69.3%) (55.1%) (Note 5) Li. GC-5; Trade name: Lipase GC-5 (manufactured by Amano Seiyaku Co.) produced by Geotrichum candidum.
• Example 4 The same sample as in Example 3 was used.
• the enzyme according to the invention was added to the sample in an amount of 50 ppm, based on the weight of the wood pulp, and treated at different temperatures for different periods.
• the amount of adhesive resin was measured and is shown in Table 4.
• the enzyme according to the invention was added in an amount of 0.5 ppm, based on the weight of the return water, treated for 2 hours at 40 ° C. and stirred for 120 minutes with a vibromixer.
• Newsprint with a basis weight of approx. 46 g / m2 was produced by the Bel-Baie-Former multi-dryer machine with a width of 5080 mm and 830 m / min. Speed produced, the paper raw material consisted of 30% wood pulp, 45% old newspaper paper stock (without printing ink), 10% softwood sulfate pulp and 15% thermomechanical wood pulp.
• the wood pulp was made from red pine, adjusted to a grinding level of 60-70 ml CSF by the post-refiner, stored as a pulp for some time, optionally mixed with other pulps and auxiliaries, stored again and finally subjected to a paper-making process. It takes 90 minutes from the refiner through the laid paper and containers to the paper machine.
• the enzyme according to the invention was added to the wood pulp sludge at a concentration of 3.8% before the post-refiner so that the lipase OF had a concentration of 3 ppm. This enzyme was continuously added to the wood pulp for two weeks. The amount of resin adhering to the screen and press parts and the time interval between the cleaning operations required to remove the resin adhering to the center roller were determined. The output of this machine was about 200 tons per day.
• a light-weight printing paper with a basis weight of 34 g / m2 was produced according to Example 7, the paper stock consisting of 20% wood pulp, 50% old newspaper paper stock (without printing ink), 15% softwood sulfate pulp and 15% thermomechanical wood pulp.
• the Lipase OF was added to the pulp in an amount of 3 ppm.
• the output of this machine was about 200 tons per day.
• the amount of resin adhering in the wire and press parts and the resin holes of the paper due to the resin adhering to the fiberizing roller were determined. The results obtained were compared to those of the "untreated" process and are shown in Table 8.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Biochemistry (AREA)
• Microbiology (AREA)
• Paper (AREA)
• Working-Up Tar And Pitch (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• Making Paper Articles (AREA)
• Preparation Of Compounds By Using Micro-Organisms (AREA)
• Mechanical Treatment Of Semiconductor (AREA)
• Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
• Materials For Medical Uses (AREA)

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• 1988
  • 1988-12-13 JP JP63314408A patent/JPH02160997A/ja active Granted
• 1989
  • 1989-12-01 AU AU45822/89A patent/AU622738B2/en not_active Expired
  • 1989-12-05 NZ NZ231637A patent/NZ231637A/en unknown
  • 1989-12-11 FI FI895901A patent/FI96520C/fi active IP Right Grant
  • 1989-12-11 CA CA002005087A patent/CA2005087C/fr not_active Expired - Lifetime
  • 1989-12-12 AT AT89122946T patent/ATE102667T1/de not_active IP Right Cessation
  • 1989-12-12 ES ES89122946T patent/ES2052874T3/es not_active Expired - Lifetime
  • 1989-12-12 EP EP89122946A patent/EP0374700B1/fr not_active Expired - Lifetime
  • 1989-12-12 DE DE89122946T patent/DE58907179D1/de not_active Expired - Lifetime
  • 1989-12-12 NO NO894988A patent/NO174433C/no not_active IP Right Cessation

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