EP2668333A1 - Method for producing a paper product - Google Patents

Method for producing a paper product

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Publication number
EP2668333A1
EP2668333A1 EP12700713.6A EP12700713A EP2668333A1 EP 2668333 A1 EP2668333 A1 EP 2668333A1 EP 12700713 A EP12700713 A EP 12700713A EP 2668333 A1 EP2668333 A1 EP 2668333A1
Authority
EP
European Patent Office
Prior art keywords
pulp
paper
aqueous composition
methanesulfonic acid
composition containing
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.)
Granted
Application number
EP12700713.6A
Other languages
German (de)
French (fr)
Other versions
EP2668333B1 (en
Inventor
Stefan Fassbender
Christoph LESSIG
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Priority to EP12700713.6A priority Critical patent/EP2668333B1/en
Publication of EP2668333A1 publication Critical patent/EP2668333A1/en
Application granted granted Critical
Publication of EP2668333B1 publication Critical patent/EP2668333B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/09—Sulfur-containing compounds
    • 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
    • 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
    • D21H21/04—Slime-control agents

Definitions

  • the present invention relates to a process for producing paper products, such as paper, board and board, comprising the addition of methanesulfonic acid (MSA) to an aqueous composition containing at least one pulp for adjusting the pH.
  • MSA methanesulfonic acid
  • the present invention relates to the use of methanesulfonic acid in the production of a paper product, in particular for adjusting the pH of an aqueous composition containing at least one fibrous material in the so-called constant part of the paper or board machine.
  • Paper or paper product in the context of the present invention designate flat products made of fibers, in particular from chemically or mechanically exposed plant fibers, which are formed by dehydration of a pulp suspension using at least one screen usually with the addition of fillers and other additives.
  • the production of paper products on modern paper or board machines involves the dewatering of a pulp suspension, for example a pulp, wood pulp and / or recovered paper suspension, on at least one moving screen to form a paper web.
  • a pulp suspension for example a pulp, wood pulp and / or recovered paper suspension
  • the following aggregates are usually grouped together: Constant part, headbox, wire section, press section, dryer section, size press (surface sizing), film press, Yankee cylinder, calender, on-line calender, on-line coater and reel.
  • the manufacture of paper products involves downstream steps of surface treatment (e.g., calendering, brushing) and equipment (e.g., slitting, size cutting, packaging).
  • a general description of the process steps and plant components in the production of paper products is described, for example, in "Papermill Paperback, 8th edition, Dr. med. Curt Haefner-Verlag GmbH, Heidelberg ".
  • the pulp suspension is made ready for subsequent sheet formation in the wire section.
  • the final or equalizing grinding of the pulp is carried out, which regulates substance quantities and material densities, and the regulation of the flow velocities is carried out.
  • the addition of filling Substances, process chemicals and / or functional chemicals is usually called all plant parts and piping between the mixing and machine chest and the headbox of the paper or board machine.
  • the constant part of the paper or board machine is usually also the adjustment of the pH of the pulp suspension.
  • the fiber suspension with a consistency of usually less than 1.4% is applied to at least one moving endless screen (machine screen).
  • machine screen the pulp suspension dewaters to a pulp density of 12 to 24% (assisted for example by the application of vacuum or pressure) and the fibers entangled to a still wet fiber fleece (sheet formation).
  • This non-woven fabric is then removed from the wire using, for example, a pick-up felt (felt belt) and passed into the subsequent wet pressing where the stock density is further increased to about 50%.
  • the nonwoven fabric is dried in the so-called drying section by means of drying cylinders.
  • the paper may be subjected to further processing steps (e.g., smoothing, brushing, calendering).
  • the pulp suspensions used for the production of paper or cardboard mostly contain fibers as well as fillers, in particular inorganic fillers such as calcium carbonate, kaolin, titanium dioxide, barium sulfate and several process and / or functional chemicals, such as sizing agent for increasing the hydrophilicity and the printability of the paper, as well as eg Retention aids, drainage aids, dyes, optical brighteners, wet strength agents, dry strength agents, defoamers, biocide.
  • inorganic fillers such as calcium carbonate, kaolin, titanium dioxide, barium sulfate and several process and / or functional chemicals, such as sizing agent for increasing the hydrophilicity and the printability of the paper, as well as eg Retention aids, drainage aids, dyes, optical brighteners, wet strength agents, dry strength agents, defoamers, biocide.
  • Fibers used in the manufacture of paper products generally include primary fibers and secondary fibers.
  • Wood pulps in particular pulps such as sulphate pulp (SA) (also called kraft pulp), sulphate pulp, sulphite pulp (SI) of deciduous and / or softwoods are used in particular as primary pulps.
  • SA sulphate pulp
  • SI sulphite pulp
  • woody fibers especially wood pulp such as groundwood (HS) (also called stone groundwood SGW), pressure ground (pressurized groundwood PGW), refiner pulp (refiner mechanical pulp RMP), thermomechanical pulp (thermo mechanical pulp TMP), thermomechanical pulp with chemical pretreatment (chemical thermal mechanical pulp CTMP) and thermomechanical pulp with sodium hydroxide peroxide pretreatment (BCTMP) in question.
  • Secondary fibrous materials include various recovered paper grades, which are recycled in the recycling of paper / cardboard and paperboard production, and deinked ones Waste paper (Deinked pulp DIP).
  • DIP is made by a wastepaper recycling process, with a large portion of the inks removed from the pulp suspension.
  • the slurried, defibrated waste paper is usually mixed with caustic soda, water glass, complexing agent, surfactant and hydrogen peroxide.
  • the printing inks detach from the fiber surface and are discharged by flotation from the pulp suspension.
  • Pulp such as groundwood, pressure ground, TMP, RMP, but also pulp are usually bleached during manufacture and / or before use.
  • oxidative and reductive bleaching stages these bleaching stages often being combined into bleaching sequences.
  • bleaching involves treatment with hydrogen peroxide under alkaline conditions. If the bleaching process concludes with an alkaline step, it is usually necessary to acidify the pulp suspension. In order to adjust the pH necessary for papermaking it is therefore usually necessary to add an acid to regulate the pH.
  • the pulp suspension used for the formation of paper generally comprises the addition of acidic aluminum salts and the neutral procedure in the pH between the conventional acidic procedure (pH in the range from 4.5 to 6.8) Range from 6.8 to 10.8.
  • pH in the range from 4.5 to 6.8
  • the pH is adjusted to a value between 7.0 to 7.5.
  • the neutral driving has become more and more prevalent, especially as it is the use of calcium carbonate (CaC0 3 ) as a filler possible, for example in the form of ground calcium carbonate (grated calumum carbonate GCC) or precipitated calcium carbonate (precipitated calcium carbonate PCC).
  • the pH of the pulp suspension is of crucial importance for paper production and directly influences the running behavior of the paper or board machine.
  • a high pH leads to increased swelling of the fibers and complicates the dewatering of the pulp suspension.
  • the accurate and reliable adjustment of the pH also helps to maintain the whiteness of the paper products and to prevent yellowing by alkalis.
  • the choice of suitable pH-adjusting acids in the manufacture of paper products is very limited. Due to the requirements of availability, price and stability, the expert selects from a very limited number of acids which are suitable for papermaking.
  • the use of phosphoric acid or a combination of phosphoric acid and phosphonates or the use of carbon dioxide for pH adjustment is described.
  • sulfuric acid and / or bisulfite to adjust the pH value in papermaking known.
  • the pH of a pulp suspension can be adjusted by adding an electrolyte such as aluminum sulfate, aluminum nitrate, polyaluminum chloride (PAC) and aluminum hydroxide chloride.
  • Document WO 98/56988 describes a process for stabilizing the pH of a pulp suspension for papermaking using a combination of an alkali metal hydroxide and carbon dioxide.
  • Document US 2010/0175839 describes a multi-step process for adjusting the pH of a pulp suspension, wherein the pulp is carbonated at least twice and at least once with a strong acid, e.g. Sulfuric acid, sulfurous acid or bisulfite, is treated and wherein a step for removing carbonate is included.
  • a strong acid e.g. Sulfuric acid, sulfurous acid or bisulfite
  • Document WO 2009/003770 discloses a papermaking process wherein a pulp suspension containing a mechanical pulp is subjected to an acid-base treatment to avoid lowering the whiteness.
  • the pulp suspension is first treated with a strong acid, especially sulfuric acid, sulphurous acid, hydrochloric acid and bisulphite, followed by a weak base (e.g., an alkali metal bicarbonate or alkali metal carbonate).
  • a strong acid especially sulfuric acid, sulphurous acid, hydrochloric acid and bisulphite
  • a weak base e.g., an alkali metal bicarbonate or alkali metal carbonate.
  • the object of the present invention is therefore to provide a pH-regulating additive, in particular an acid, for pulp suspensions in papermaking or an improved papermaking process.
  • the process should fulfill all wastewater-relevant and environmental requirements and enable efficient, simple and cost-effective process management. For example, a simple metering, a low introduction of additional salt load into the screen or wastewater of the paper machine and a good dewatering behavior of the pulp suspension should be ensured.
  • Methanesulfonic acid has a pK s value of about -0.6 and thus represents a strong to very strong acid.
  • Methanesulfonic acid is generally non-oxidizing and is characterized in particular by heat and hydrolysis resistance.
  • Methanesulfonates are used, for example, in detergents and cleaners.
  • Methanesulfonic acid is still used in acid plating solutions for metal coatings.
  • the present application is directed to a process for making a paper product, such as paper, board and board, comprising the steps of: a) providing an aqueous composition containing at least one pulp; b) adding methanesulfonic acid to the aqueous composition containing at least one pulp to adjust the pH; c) dewatering the aqueous composition containing at least one pulp.
  • methanesulfonic acid is easily biodegradable and halogen-free and thus relieves the wastewater treatment of the manufacturing process. In addition, no or a significantly lower phosphorus or phosphate pollution in the wastewater of the paper or board machine.
  • Methanesulfonic acid is colorless and odorless and also available in high-purity quality, so there is no burden on the production system (process water, wastewater, circulating water, paper products) with foreign substances. Therefore, methanesulfonic acid is particularly suitable for use in the manufacture of paper products (e.g., packaging materials) used in the food industry.
  • Methanesulfonic acid has high thermal stability, has low vapor pressure, is resistant to hydrolysis, and is immiscible with water indefinitely, so handling and dosing are easy.
  • Methanesulfonic acid is halogen-free and has a low corrosivity compared to sulfuric acid.
  • methanesulfonic acid thus makes it possible to significantly improve the quality of the production of paper products.
  • Paper or paper product in the context of the present invention designate flat products made of fibers, in particular from chemically or mechanically exposed plant fibers, which are formed by dehydration of a pulp suspension using at least one screen usually with the addition of fillers and other additives.
  • process chemicals eg biocides, deaerators, retention aids
  • functional chemicals eg dyes, optical brighteners, wet strength agents.
  • paper or paper products are to be understood in particular as meaning graphic papers, office communication papers, packaging papers, hygiene papers and special papers.
  • fish papers are all papers which are used for printing, for example, in flexographic printing, high-pressure, offset printing or intaglio printing, for example newsprint papers.
  • Office communication papers are to be understood as writing, printing and copying papers, for example photo printing and digital printing papers.
  • Packaging papers are papers, cardboard and cardboard for packaging purposes, eg corrugated board.
  • tissue papers are papers with a high specific volume and high suction force, which are typically used in the sanitary and kitchen sector or in the industrial sector.
  • special papers refers to papers and boards for special technical purposes, such as decor papers and filter papers.
  • paper products can be classified into paper, cardboard and possibly cardboard.
  • a basis weight of less than or equal to 225 g / m 2 of paper and greater than 225 g / m 2 of cardboard is used.
  • paper products with a basis weight in the range of 7 to 150 g / m 2 are referred to as paper, in the range of 150 to 600 g / m 2 as cardboard and from 600 g / m 2 as cardboard.
  • Cardboard and paperboard are predominantly made up of several layers.
  • the present invention relates to a method as described above, characterized in that when dewatering the aqueous composition (step c) a nonwoven fabric is formed, which is pressed and / or dried in one or more further process step (s).
  • the aqueous composition is a suspension (slurry) of a pulp in water.
  • the aqueous composition may contain further dissolved, colloidally dissolved or solid constituents.
  • it is known to those skilled ingredients that are used in the production of paper products or incurred.
  • the pulp may in particular be selected from:
  • pulp such as sulphate pulp (SA) (also called kraft pulp), sulphate half-pulp, sulphite pulp (S1);
  • SA sulphate pulp
  • S1 sulphite pulp
  • mechanical pulp such as groundwood (SG), pressurized groundwood (PGW), refiner mechanical pulp (RMP), thermomechanical pulp (TMP), thermomechanical pulp with chemical pretreatment (chemical thermal mechanical pulp CTMP), thermomechanical pulp with caustic soda / peroxide pretreatment (BCTMP);
  • Secondary pulp such as waste paper (AP) and deinked pulp (DIP).
  • AP waste paper
  • DIP deinked pulp
  • bleached and / or unbleached pulps and / or fibers of deciduous or softwoods described above may be used as fibrous materials. Preference is given to using beech sulphite pulp and / or long fiber sulphate pulp.
  • the aqueous composition comprises at least one fibrous material selected from the group consisting of sulphate pulp (SA), sulphate half-cell pulp, sulphite pulp (SI), groundwood (HS), pressure groundwood (PGW), refiner pulp (RMP), thermomechanical pulp (TMP), thermomechanical pulp with chemical pretreatment (CTMP), thermomechanical pulp with caustic soda / peroxide pretreatment (BCTMP), waste paper (AP) and deinked waste paper (DIP).
  • SA sulphate pulp
  • SI groundwood
  • PGW pressure groundwood
  • RMP refiner pulp
  • TMP thermomechanical pulp
  • TMP thermomechanical pulp with chemical pretreatment
  • CTMP thermomechanical pulp with caustic soda / peroxide pretreatment
  • AP waste paper
  • DIP deinked waste paper
  • At least one secondary fiber in particular waste paper and / or deinked waste paper (DIP), is used as the pulp.
  • DIP deinked waste paper
  • the aqueous composition contains at least one pulp which has been bleached by alkaline oxidative.
  • the aqueous composition containing at least one pulp preferably has a pulp density of 0.01 to 5%, preferably 0, 1 to 5%, particularly preferably 0.2 to 1.4%.
  • the consistency of an aqueous composition containing at least one fiber is understood as meaning the percentage of the dry mass of the solids which can be filtered off in the composition in relation to the mass of the entire composition.
  • the dry matter is usually stated as absolute dry matter (atro) or as dry matter during drying under standard conditions (oven-dry, otro).
  • the determination of the consistency of pulp suspensions is described for example in DIN 54359 (EN ISO 41 19).
  • the aqueous composition may comprise at least one customary additive known to the person skilled in the art (process and functional chemicals).
  • the additive can be selected from Process chemicals, like
  • Electrolyte for example, aluminum sulfate, aluminum nitrate, polyaluminum chloride (PAC), aluminum hydroxide chloride, inorganic precipitants
  • Biocide e.g., slimicides
  • Adsorbents e.g., talc
  • Fixatives e.g., short chain cationic polymers
  • Retention aids e.g., long chain anionic and cationic polymers, partially cross-linked
  • Engine sizing agent rosin size, AKD, ASA, polymer size
  • the aqueous composition additionally contains at least one further additive selected from the group consisting of aluminum sulfate, aluminum nitrate, polyaluminum chloride (PAC), aluminum hydroxide chloride, organic precipitant, biocide, deaerator, defoamer, dispersant, adsorbent, fixer, Retention aid, drainage accelerator, dye, optical brightener, engine sizing agent, wet strength agent, dry strength agent and internal wet web strength polymer (IWWS).
  • PAC polyaluminum chloride
  • IWWS internal wet web strength polymer
  • the aqueous composition additionally comprises at least one inorganic filler selected from the group consisting of grinded calcium carbonate (GCC), precipitated calcium carbonate (PCC), kaolin, titanium dioxide and barium sulfate, preferably selected from the group consisting of ground calcium carbonate ( GCC) and precipitated calcium carbonate (PCC).
  • GCC grinded calcium carbonate
  • PCC precipitated calcium carbonate
  • kaolin titanium dioxide
  • barium sulfate preferably selected from the group consisting of ground calcium carbonate ( GCC) and precipitated calcium carbonate (PCC).
  • the pH of an aqueous composition comprising at least one fibrous material is adjusted in particular by adding methanesulfonic acid until the desired pH or the desired pH range has been reached.
  • methanesulfonic acid The person skilled in common methods for controlling the pH are known.
  • the amount of methanesulfonic acid added depends on the type of aqueous composition containing at least one pulp and its initial value of the pH and the
  • the pH of the aqueous composition containing at least one fibrous material can be adjusted by adding a mixture of acids containing methanesulfonic acid. It is also conceivable to use a mixture of methanesulfonic acid and carbon dioxide or a mixture of acids containing methanesulfonic acid and carbon dioxide. In particular, methanesulfonic acid is added as the sole acid to adjust and / or stabilize the pH. In addition, it is conceivable to additionally carry out the adjustment or regulation of the pH of the aqueous composition by adding a base known to the person skilled in the art.
  • the present invention relates to a process for producing a paper product as described above, characterized in that the pH of the aqueous composition containing at least one pulp to a value in the range of 4 to 1 1, in particular in the range of 4.5 to 6 8, in particular in the range of 6.8 to 10.8. If the method according to the invention relates to a method for producing a paper product using the acidic method of driving, in particular a pH in the range from 4.5 to 6.8 is set by addition of methanesulfonic acid.
  • the process according to the invention relates to a process for the production of a paper product using the so-called neutral procedure (usually with use of calcium carbonate as filler)
  • the pH of the aqueous composition containing at least one fibrous material is preferably in the range of 6.8 to 10.8; especially adjusted from 7.0 to 7.5.
  • the process for producing a paper product described in the present application may comprise further conventional process steps of paper or board production, eg steps in stock preparation comprising dispersion, sorting, grinding of the pulp, steps following the drying, such as calendering, brushing, Cutting as well as steps concerning the equipment.
  • the addition of methanesulfonic acid to the aqueous composition containing at least one pulp may occur at one or more different stages of the process of making the paper product.
  • the addition of methanesulfonic acid to the aqueous composition containing at least one pulp takes place in the constant part of a paper machine.
  • constant part for the purposes of the present invention is generally referred to all parts of the plant and pipeline between the mixing and machine chest and the headbox of the paper or board machine.
  • the pulp suspension is made ready for subsequent sheet formation in the wire section.
  • the final or Ausretesmahlung the pulp is performed, which regulates substance quantities and material densities, as well as the control of the flow rates performed.
  • the constant part of the paper or board machine is in particular a uniform dilution of the aqueous composition containing at least one pulp (pulp suspension) of about 3 to 5% consistency (thick stock) to about 0.2 to 1, 4% consistency.
  • pulp suspension of fiber bundles, sand, plastics, etc. cleaned.
  • the process according to the invention can be used for the production of all paper products known to the person skilled in the art.
  • the method according to the invention relates to the production of a paper product selected from graphic paper, office communication paper, packaging paper, cardboard, cardboard, tissue paper and special paper, preferably a method for producing a graphic paper or office communication paper.
  • the invention relates to a method for producing a paper product, characterized in that the paper product is a packaging material for the food sector.
  • the present application is directed to the use of methanesulfonic acid in the manufacture of a paper product.
  • the use according to the invention of methanesulfonic acid in the production of a paper product comprises adjusting the pH of an aqueous composition comprising at least one fibrous material.
  • the use of methanesulfonic acid according to the invention relates to the production of paper products on industrially common paper and / or board machines.
  • the use of methanesulfonic acid comprises adjusting the pH of an aqueous composition containing at least one pulp in the constant part of a paper and board machine.
  • the methanesulfonic acid can be used before the headbox.
  • the invention relates to the use of methanesulfonic acid in the manufacture of a paper product selected from graphic paper, office communication paper, packaging paper, cardboard, cardboard, tissue paper and special paper, in particular a packaging material for the food industry.

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  • Paper (AREA)

Abstract

The invention relates to a method for producing paper products, such as paper, paperboard and cardboard, comprising the step of adjusting the pH of an aqueous composition containing at least one fiber material by adding methanesulfonic acid (MSA).

Description

Verfahren zur Herstellung eines Papiererzeugnisses Beschreibung  Process for producing a paper product Description
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Papiererzeugnissen, wie Papier, Pappe und Karton, umfassend die Zugabe von Methansulfonsäure (MSA) zu einer wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff zum Einstellen des pH-Wertes. The present invention relates to a process for producing paper products, such as paper, board and board, comprising the addition of methanesulfonic acid (MSA) to an aqueous composition containing at least one pulp for adjusting the pH.
Ferner betrifft die vorliegende Erfindung die Verwendung von Methansulfonsäure bei der Herstellung eines Papiererzeugnisses, insbesondere zum Einstellen des pH- Wertes einer wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff im so genannten Konstantteil der Papier- beziehungsweise Kartonmaschine. Furthermore, the present invention relates to the use of methanesulfonic acid in the production of a paper product, in particular for adjusting the pH of an aqueous composition containing at least one fibrous material in the so-called constant part of the paper or board machine.
Papier bzw. Papiererzeugnis im Sinne der vorliegenden Erfindung bezeichnen flächige Erzeugnisse aus Fasern, insbesondere aus chemisch oder mechanisch freigelegten Pflanzenfasern, welche durch Entwässerung einer Faserstoff-Suspension mit Hilfe mindestens eines Siebes meist unter Zusatz von Füllstoffen und weiteren Additiven gebildet werden. Paper or paper product in the context of the present invention designate flat products made of fibers, in particular from chemically or mechanically exposed plant fibers, which are formed by dehydration of a pulp suspension using at least one screen usually with the addition of fillers and other additives.
Generell umfasst die Herstellung von Papiererzeugnissen auf modernen Papier- beziehungsweise Kartonmaschinen die Entwässerung einer Faserstoff-Suspension, zum Beispiel einer Zellstoff-, Holzstoff und/oder Altpapier-Suspension, auf mindestens ei- nem sich bewegenden Sieb unter Bildung einer Papierbahn. Unter dem Begriff Papierbzw. Kartonmaschine werden üblicherweise die folgenden Aggregate zusammenge- fasst: Konstantteil, Stoffauflauf, Siebpartie, Pressenpartie, Trockenpartie, Leimpresse (Oberflächenleimung), Filmpresse, Glättzylinder, Glättwerk, Online-Kalander, Online- Streichaggregat und Aufrollung. Oftmals umfasst die Herstellung von Papiererzeugnis- sen nachgeschaltete Schritte der Oberflächenbehandlung (z.B. Kalandrieren, Streichen) und die Ausrüstung (z.B. Rollenschneiden, Formatschneiden, Verpacken). Eine allgemeine Beschreibung der Verfahrensschritte und Anlagenteile bei der Herstellung von Papiererzeugnissen ist beispielsweise in„Papiermacher Taschenbuch , 8. Auflage, Dr. Curt Haefner-Verlag GmbH, Heidelberg" beschrieben. Generally, the production of paper products on modern paper or board machines involves the dewatering of a pulp suspension, for example a pulp, wood pulp and / or recovered paper suspension, on at least one moving screen to form a paper web. Under the term Papierbzw. The following aggregates are usually grouped together: Constant part, headbox, wire section, press section, dryer section, size press (surface sizing), film press, Yankee cylinder, calender, on-line calender, on-line coater and reel. Often, the manufacture of paper products involves downstream steps of surface treatment (e.g., calendering, brushing) and equipment (e.g., slitting, size cutting, packaging). A general description of the process steps and plant components in the production of paper products is described, for example, in "Papermill Paperback, 8th edition, Dr. med. Curt Haefner-Verlag GmbH, Heidelberg ".
Im so genannten konstanten Teil (Konstantteil) wird die Faserstoff-Suspension für die nachfolgende Blattbildung in der Siebpartie maschinenfertig gemacht. Hier wird beispielsweise die End- bzw. Ausgleichsmahlung des Faserstoffs durchgeführt, die Stoffmengen und Stoffdichten reguliert, sowie die Regelung der Strömungsgeschwindigkei- ten durchgeführt. Innerhalb des Konstantteiles kann zudem das Zudosieren von Füll- Stoffen, Prozesschemikalien und/oder Funktionschemikalien erfolgen. Als Konstantteil bezeichnet man in der Regel alle Anlagenteile und Rohrleitung zwischen der Misch- und Maschinenbütte und dem Stoffauflauf der Papier- bzw. Kartonmaschine. Im Konstantteil der Papier- bzw. Kartonmaschine erfolgt in der Regel auch das Einstellen des pH-Wertes der Faserstoff-Suspension. In the so-called constant part (constant part), the pulp suspension is made ready for subsequent sheet formation in the wire section. Here, for example, the final or equalizing grinding of the pulp is carried out, which regulates substance quantities and material densities, and the regulation of the flow velocities is carried out. Within the constant part, the addition of filling Substances, process chemicals and / or functional chemicals. As a constant part is usually called all plant parts and piping between the mixing and machine chest and the headbox of the paper or board machine. In the constant part of the paper or board machine is usually also the adjustment of the pH of the pulp suspension.
Im Stoffauflauf wird die Fasersuspension mit einer Stoffdichte von in der Regel weniger als 1 ,4 % auf mindestens ein sich bewegendes Endlossieb (Maschinensieb) aufgebracht. In der nachfolgenden so genannten Siebpartie entwässert die Faserstoff- Suspension bis etwa zu einer Stoffdichte von 12 bis 24 % (unterstützt beispielsweise durch das Anlegen von Vakuum oder Druck) und die Fasern verfilzen zu einem noch nassen Faservlies (Blattbildung). Dieses Faservlies wird dann zum Beispiel mit Hilfe eines Abnahmefilzes (Filzband) vom Sieb abgenommen und in die anschließenden Nasspressen geleitet, wo die Stoffdichte weiter auf bis etwa 50 % erhöht wird. In the headbox, the fiber suspension with a consistency of usually less than 1.4% is applied to at least one moving endless screen (machine screen). In the subsequent so-called wire section, the pulp suspension dewaters to a pulp density of 12 to 24% (assisted for example by the application of vacuum or pressure) and the fibers entangled to a still wet fiber fleece (sheet formation). This non-woven fabric is then removed from the wire using, for example, a pick-up felt (felt belt) and passed into the subsequent wet pressing where the stock density is further increased to about 50%.
Danach wird in der Regel das Faservlies in der so genannten Trockenpartie mittels Trockenzylindern getrocknet. Für bestimmte Verwendungszwecke kann das Papier noch weiteren Bearbeitungsschritten (z.B. Glätten, Streichen, Kalandrieren) unterworfen werden. Thereafter, as a rule, the nonwoven fabric is dried in the so-called drying section by means of drying cylinders. For certain uses, the paper may be subjected to further processing steps (e.g., smoothing, brushing, calendering).
Die zur Papier- oder Kartonherstellung genutzten Faserstoff-Suspensionen enthalten meist neben Fasern Füllstoffe, insbesondere anorganische Füllstoffe wie Kalziumkarbonat, Kaolin, Titandioxid, Bariumsulfat und mehrere Prozess- und/oder Funktionschemikalien, wie zum Beispiel Leimungsmittel zur Erhöhung der Hydrophilie und der Bedruckbarkeit des Papiers, sowie z.B. Retentionshilfsmittel, Entwässerungshilfsmittel, Farbstoffe, optische Aufheller, Nassfestmittel, Trockenverfestiger, Entschäumer, Biozid. The pulp suspensions used for the production of paper or cardboard mostly contain fibers as well as fillers, in particular inorganic fillers such as calcium carbonate, kaolin, titanium dioxide, barium sulfate and several process and / or functional chemicals, such as sizing agent for increasing the hydrophilicity and the printability of the paper, as well as eg Retention aids, drainage aids, dyes, optical brighteners, wet strength agents, dry strength agents, defoamers, biocide.
Als Faserstoffe für die Herstellung von Papiererzeugnissen kommen generell Primärfa- serstoffe sowie Sekundärfaserstoffe in Frage. Als Primärfaserstoffe kommen insbesondere holzfreie Faserstoffe, insbesondere Zellstoffe wie Sulfatzellstoff (SA) (auch Kraftzellstoff genannt), Sulfathalbzellstoff, Sulfitzellstoff (Sl) von Laub- und/oder Nadelhölzern zum Einsatz. Es können aber auch holzhaltige Faserstoffe, insbesondere Holzstoffe wie Holzschliff (HS) (auch stone groundwood SGW genannt), Druckschliff (pressurized groundwood PGW), Refiner Holzstoff (refiner mechanical pulp RMP), thermomechanischer Holzstoff (thermo mechanical pulp TMP), thermomechanischer Holzstoff mit chemischer Vorbehandlung (chemical thermal mechanical pulp CTMP) und thermomechanischer Holzstoff mit Natronlauge-Peroxid-Vorbehandlung (BCTMP) in Frage. Unter Sekundärfaserstoffe fallen verschiedene Altpapiersorten, die im Recyc- ling der Papier-/ Karton- und Pappenerzeugung zurückgeführt werden, sowie deinkte Altpapiere (Deinked pulp DIP). DIP wird durch einen Altpapier-Aufbereitungsprozess hergestellt, wobei ein großer Teil der Druckfarben aus der Faserstoff-Suspension entfernt wird. Beim Deinking-Prozess wird gängigerweise das aufgeschlämmte, zerfaserte Altpapier mit Natronlauge, Wasserglas, Komplexbildner, Tensid und Wasserstoffpero- xid versetzt. Die Druckfarben lösen sich von der Faseroberfläche und werden mittels Flotation aus der Faserstoff-Suspension ausgetragen. Fibers used in the manufacture of paper products generally include primary fibers and secondary fibers. Wood pulps, in particular pulps such as sulphate pulp (SA) (also called kraft pulp), sulphate pulp, sulphite pulp (SI) of deciduous and / or softwoods are used in particular as primary pulps. But it can also woody fibers, especially wood pulp such as groundwood (HS) (also called stone groundwood SGW), pressure ground (pressurized groundwood PGW), refiner pulp (refiner mechanical pulp RMP), thermomechanical pulp (thermo mechanical pulp TMP), thermomechanical pulp with chemical pretreatment (chemical thermal mechanical pulp CTMP) and thermomechanical pulp with sodium hydroxide peroxide pretreatment (BCTMP) in question. Secondary fibrous materials include various recovered paper grades, which are recycled in the recycling of paper / cardboard and paperboard production, and deinked ones Waste paper (Deinked pulp DIP). DIP is made by a wastepaper recycling process, with a large portion of the inks removed from the pulp suspension. In the deinking process, the slurried, defibrated waste paper is usually mixed with caustic soda, water glass, complexing agent, surfactant and hydrogen peroxide. The printing inks detach from the fiber surface and are discharged by flotation from the pulp suspension.
Holzstoff, wie Holzschliff, Druckschliff, TMP, RMP, aber auch Zellstoff werden üblicherweise bei der Herstellung und/oder vor dem Einsatz gebleicht. Man unterscheidet in der Regel oxidative und reduktive Bleichstufen, wobei diese Bleichstufen oftmals in Bleichsequenzen kombiniert werden. Häufig umfasst das Bleichen eine Behandlung mit Wasserstoffperoxid unter alkalischen Bedingungen. Schließt das Bleichverfahren mit einer alkalischen Stufe ab, ist in der Regel ein Absäuern der Faserstoff-Suspension notwendig. Um den für die Papierherstellung notwendigen pH-Wert einzustellen ist daher in der Regel die Zugabe einer Säure zur Regulierung des pH-Wertes notwendig. Pulp, such as groundwood, pressure ground, TMP, RMP, but also pulp are usually bleached during manufacture and / or before use. As a rule, a distinction is made between oxidative and reductive bleaching stages, these bleaching stages often being combined into bleaching sequences. Frequently, bleaching involves treatment with hydrogen peroxide under alkaline conditions. If the bleaching process concludes with an alkaline step, it is usually necessary to acidify the pulp suspension. In order to adjust the pH necessary for papermaking it is therefore usually necessary to add an acid to regulate the pH.
Im Allgemeinen unterscheidet man je nach pH-Wert, der zur Papierbildung eingesetzten Faserstoff-Suspension zwischen der herkömmlichen sauren Fahrweise (pH im Bereich von 4,5 bis 6,8) umfassend in der Regel die Zugabe von sauren Aluminiumsalzen und der neutralen Fahrweise im pH Bereich von 6,8 bis 10,8. Im Idealfall einer neutralen Fahrweise erfolgt die Einstellung des pH-Wertes auf einen Wert zwischen 7,0 bis 7,5. In den letzten Jahrzehnten hat sich die neutrale Fahrweise mehr und mehr durchgesetzt, insbesondere da hierbei der Einsatz von Kalziumkarbonat (CaC03) als Füllstoff möglich ist, zum Beispiel in Form von gemahlenem Kalziumkarbonat (grinded cal- dum carbonate GCC) oder gefälltem Kalziumkarbonat (precipitated calcium carbonate PCC). In general, depending on the pH, the pulp suspension used for the formation of paper generally comprises the addition of acidic aluminum salts and the neutral procedure in the pH between the conventional acidic procedure (pH in the range from 4.5 to 6.8) Range from 6.8 to 10.8. In the ideal case of a neutral driving style, the pH is adjusted to a value between 7.0 to 7.5. In recent decades, the neutral driving has become more and more prevalent, especially as it is the use of calcium carbonate (CaC0 3 ) as a filler possible, for example in the form of ground calcium carbonate (grated calumum carbonate GCC) or precipitated calcium carbonate (precipitated calcium carbonate PCC).
Der pH-Wert der Faserstoff-Suspension ist von entscheidender Bedeutung für die Papierherstellung und beeinflusst unmittelbar das Laufverhalten der Papier- bzw. Karton- maschine. Ein hoher pH-Wert führt zu einer verstärkten Quellung der Fasern und erschwert die Entwässerung der Faserstoff-Suspension. Die genaue und zuverlässige Einstellung des pH-Wertes trägt weiterhin dazu bei, den Weißgrad der Papiererzeugnisse zu erhalten und eine Vergilbung durch Alkalien zu vermeiden. Die Auswahl an geeigneten Säuren für die Einstellung des pH-Werts im Rahmen der Herstellung von Papiererzeugnissen ist sehr begrenzt. Aufgrund der Anforderungen an Verfügbarkeit, Preis und Stabilität wählt der der Fachmann aus einer sehr begrenzten Anzahl an Säuren, die für die Papierherstellung in Frage kommen aus. Im Stand der Technik ist der Einsatz von Phosphorsäure bzw. einer Kombination von Phosphorsäure und Phosphonaten oder der Einsatz von Kohlendioxid zur pH-Wert Einstellung beschrie- ben. Weiterhin ist der Einsatz von Schwefelsäure und/oder Bisulfit zur Einstellung des pH-Wertes bei der Papierherstellung bekannt. Zudem ist beschrieben, dass sich der pH-Wert einer Faserstoff-Suspension durch Zugabe eines Elektrolyten, wie Aluminiumsulfat, Aluminiumnitrat, Polyaluminiumchlorid (PAC) und Aluminiumhydroxidchlorid, einstellen lässt. The pH of the pulp suspension is of crucial importance for paper production and directly influences the running behavior of the paper or board machine. A high pH leads to increased swelling of the fibers and complicates the dewatering of the pulp suspension. The accurate and reliable adjustment of the pH also helps to maintain the whiteness of the paper products and to prevent yellowing by alkalis. The choice of suitable pH-adjusting acids in the manufacture of paper products is very limited. Due to the requirements of availability, price and stability, the expert selects from a very limited number of acids which are suitable for papermaking. In the prior art, the use of phosphoric acid or a combination of phosphoric acid and phosphonates or the use of carbon dioxide for pH adjustment is described. Furthermore, the use of sulfuric acid and / or bisulfite to adjust the pH value in papermaking known. In addition, it is described that the pH of a pulp suspension can be adjusted by adding an electrolyte such as aluminum sulfate, aluminum nitrate, polyaluminum chloride (PAC) and aluminum hydroxide chloride.
Das Dokument WO 98/56988 beschreibt ein Verfahren zur Stabilisierung des pH- Wertes einer Pulpe Suspension für die Papierherstellung unter Verwendung einer Kombination eines Alkalimetallhydroxides und Kohlendioxid. Das Dokument US 2010/0175839 beschreibt ein mehrstufiges Verfahren zur Einstellung des pH-Wertes einer Zellstoffsuspension, wobei der Zellstoff mindestens zweimal mit Kohlendioxid und mindestens einmal mit einer starken Säure, z.B. Schwefelsäure, schweflige Säure oder Bisulfit, behandelt wird und wobei ein Schritt zur Carbonat- Entfernung umfasst ist. Document WO 98/56988 describes a process for stabilizing the pH of a pulp suspension for papermaking using a combination of an alkali metal hydroxide and carbon dioxide. Document US 2010/0175839 describes a multi-step process for adjusting the pH of a pulp suspension, wherein the pulp is carbonated at least twice and at least once with a strong acid, e.g. Sulfuric acid, sulfurous acid or bisulfite, is treated and wherein a step for removing carbonate is included.
Das Dokument WO 2009/003770 offenbart ein Verfahren zur Papierherstellung, wobei eine Faserstoff-Suspension enthaltend einen mechanischen Holzstoff einer Säure- Base-Behandlung zur Vermeidung einer Erniedrigung der Weiße unterzogen wird. Dabei wird die Faserstoff-Suspension zunächst mit einer starken Säure, insbesondere Schwefelsäure, schwefliger Säure, Salzsäure und Bisulfit, und anschließend mit einer schwachen Base (z.B. ein Alkalimetall-Bicarbonat oder Alkalimetall-Carbonat) behandelt. Document WO 2009/003770 discloses a papermaking process wherein a pulp suspension containing a mechanical pulp is subjected to an acid-base treatment to avoid lowering the whiteness. The pulp suspension is first treated with a strong acid, especially sulfuric acid, sulphurous acid, hydrochloric acid and bisulphite, followed by a weak base (e.g., an alkali metal bicarbonate or alkali metal carbonate).
Durch den Einsatz von Phosphorsäure und Phosphonaten, wie im Stand der Technik beschrieben, kommt es vermehrt zur Bildung und Ablagerung von Calciumphosphaten in verschiedenen Teilen der Papiermaschine. Als Folge von Reinigungszeiten kommt es so vermehrt zum Stillstand der Papier- bzw. Kartonmaschine. The use of phosphoric acid and phosphonates, as described in the prior art, leads increasingly to the formation and deposition of calcium phosphates in various parts of the paper machine. As a result of cleaning times, it comes increasingly to a standstill of the paper or board machine.
Um den Ausstoß von Papier bzw. Pappe zu erhöhen, arbeiten viele moderne Papier- maschinen bei sehr hohen Geschwindigkeiten von bis zu 1.800 Meter pro Minute und Produktionsmengen bis zu 1000 t Papier pro 24 h. Ein Stillstand der Papier bzw. Kartonmaschine und die vermehrte Produktion von Ausschuss sind daher die entscheidenden Faktoren für die Effizienz und Wirtschaftlichkeit des Herstellungsverfahrens. Des Weiteren belasten Phosphorverbindungen die Abwasser-Reinigungsanlagen der Papierfabriken, welche in der Regel im Gegensatz zu kommunalen Kläranlagen über keine Phosphoreliminierung verfügen. To increase the output of paper or board, many modern paper machines operate at very high speeds of up to 1,800 meters per minute and production volumes of up to 1,000 t of paper per 24 h. A stoppage of the paper or board machine and the increased production of rejects are therefore the decisive factors for the efficiency and economy of the manufacturing process. Furthermore, phosphorus compounds pollute the wastewater treatment plants of the paper mills, which generally have no phosphorus removal, in contrast to municipal sewage treatment plants.
Problematisch beim Einsatz von Kohlendioxid zur pH-Wert Regulierung von Faserstoff- Suspensionen ist insbesondere das Ausgasen von Kohlendioxid im Siebwasserkreis- lauf sowie die damit verbundenen Schwankungen im pH-Wert. Zudem erfordert die Dosierung des gasförmigen Additivs Kohlendioxid aufwändigere Dosiervorrichtungen. The problem with the use of carbon dioxide for the pH regulation of pulp suspensions is, in particular, the outgassing of carbon dioxide in the white water circuit. run and the associated fluctuations in the pH value. In addition, the dosage of the gaseous additive carbon dioxide requires more complex metering devices.
Der vorliegenden Erfindung liegt somit die Aufgabe zugrunde, ein pH-regulierendes Additives, insbesondere eine Säure, für Faserstoff-Suspensionen bei der Papierherstellung bzw. ein verbessertes Verfahren zur Papierherstellung bereitzustellen. Das Verfahren sollte zum einen alle abwasserrelevanten und umwelttechnischen Anforderungen erfüllt sowie eine effiziente, einfache und kostengünstig durchzuführende Verfahrensführung ermöglicht. So sollte beispielsweise eine einfache Dosierung, eine ge- ringes Einbringen von zusätzlicher Salzfracht in das Sieb- bzw. Abwasser der Papiermaschine sowie ein gutes Entwässerungsverhalten der Faserstoff-Suspension gewährleistet sein. The object of the present invention is therefore to provide a pH-regulating additive, in particular an acid, for pulp suspensions in papermaking or an improved papermaking process. On the one hand, the process should fulfill all wastewater-relevant and environmental requirements and enable efficient, simple and cost-effective process management. For example, a simple metering, a low introduction of additional salt load into the screen or wastewater of the paper machine and a good dewatering behavior of the pulp suspension should be ensured.
Es wurde überraschenderweise gefunden, dass sich der pH-Wert von Faserstoff- Suspensionen bei der Papierherstellung durch Zugabe von Methansulfonsäure (MSA) besonders effektiv einstellen lässt. It has surprisingly been found that the pH value of pulp suspensions in papermaking can be adjusted particularly effectively by adding methanesulfonic acid (MSA).
Methansulfonsäure weist einen pKs-Wert von etwa -0,6 auf und stellt somit eine starke bis sehr starke Säure dar. Methansulfonsäure wirkt allgemein nicht oxidierend und zeichnet sich insbesondere durch Hitze- und Hydrolysebeständigkeit aus. Methansul- fonate werden beispielsweise in Wasch- und Reinigungsmitteln eingesetzt. Methansulfonsäure findet weiterhin Anwendung in sauren Galvanisierungslösungen für Metallbeschichtungen. Die vorliegende Anmeldung ist gerichtet auf ein Verfahren zur Herstellung eines Papiererzeugnisses, wie Papier, Pappe und Karton, enthaltend die folgenden Schritte: a) Bereitstellen einer wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff; b) Zugabe von Methansulfonsäure zu der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff zur Einstellen des pH-Wertes; c) Entwässerung der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff. Methanesulfonic acid has a pK s value of about -0.6 and thus represents a strong to very strong acid. Methanesulfonic acid is generally non-oxidizing and is characterized in particular by heat and hydrolysis resistance. Methanesulfonates are used, for example, in detergents and cleaners. Methanesulfonic acid is still used in acid plating solutions for metal coatings. The present application is directed to a process for making a paper product, such as paper, board and board, comprising the steps of: a) providing an aqueous composition containing at least one pulp; b) adding methanesulfonic acid to the aqueous composition containing at least one pulp to adjust the pH; c) dewatering the aqueous composition containing at least one pulp.
Der Einsatz von Methansulfonsäure ist insbesondere mit den folgenden Vorteilen verbunden: Methansulfonsäure ist biologisch leicht abbaubar und halogenfrei und entlastet somit die Abwasserbehandlung des Herstellungsverfahrens. Zudem entsteht keine bzw. eine deutlich geringere Phosphor- bzw. Phosphatbelastung im Abwasser der Papier- bzw. Kartonmaschine. The use of methanesulfonic acid is associated in particular with the following advantages: Methanesulfonic acid is easily biodegradable and halogen-free and thus relieves the wastewater treatment of the manufacturing process. In addition, no or a significantly lower phosphorus or phosphate pollution in the wastewater of the paper or board machine.
Es bilden sich keine bzw. weniger Ablagerungen, wie z.B. Calciumphosphat, in den Anlagenteilen der Papier- bzw. Kartonmaschine. There are no or less deposits, e.g. Calcium phosphate, in the plant parts of the paper or board machine.
Aufgrund der hohen Säurekonstante von Methansulfonsäure sind vergleichsweise niedrige Zugabemengen notwendig. Die Salzfracht von Prozesswässern bei der Papierherstellung kann somit vermindert werden. Due to the high acid constant of methanesulfonic acid comparatively low addition levels are necessary. The salt load of process waters in papermaking can thus be reduced.
Wirtschaftlichkeit/Effizienz des Herstellungsverfahrens wird verbessert. Methansulfonsäure ist färb- und geruchlos und zudem in hochreiner Qualität verfügbar, daher erfolgt keine Belastung des Herstellungssystems (Prozesswasser, Abwasser, Kreislaufwasser, Papiererzeugnisse) mit Fremdstoffen. Daher ist Methansulfonsäure insbesondere zum Einsatz bei der Herstellung von Papiererzeugnissen (z.B. Verpackungsmaterialien) geeignet, die im Lebensmittelbereich verwendet werden. Efficiency / efficiency of the manufacturing process is improved. Methanesulfonic acid is colorless and odorless and also available in high-purity quality, so there is no burden on the production system (process water, wastewater, circulating water, paper products) with foreign substances. Therefore, methanesulfonic acid is particularly suitable for use in the manufacture of paper products (e.g., packaging materials) used in the food industry.
Methansulfonsäure weist eine hohe thermische Stabilität auf, hat einen geringen Dampfdruck, ist hydrolysebeständig und unbegrenzt mit Wasser mischbar, daher sind Handhabung und Dosierung einfach. Methanesulfonic acid has high thermal stability, has low vapor pressure, is resistant to hydrolysis, and is immiscible with water indefinitely, so handling and dosing are easy.
Methansulfonsäure ist halogenfrei und weist etwa im Vergleich zu Schwefelsäure eine geringe Korrosivität auf. Methanesulfonic acid is halogen-free and has a low corrosivity compared to sulfuric acid.
Durch den Einsatz vom Methansulfonsäure lässt sich somit die Wrtschaftlichkeit der Herstellung von Papiererzeugnissen deutlich verbessern. The use of methanesulfonic acid thus makes it possible to significantly improve the quality of the production of paper products.
Papier bzw. Papiererzeugnis im Sinne der vorliegenden Erfindung bezeichnen flächige Erzeugnisse aus Fasern, insbesondere aus chemisch oder mechanisch freigelegten Pflanzenfasern, welche durch Entwässerung einer Faserstoff-Suspension mit Hilfe mindestens eines Siebes meist unter Zusatz von Füllstoffen und weiteren Additiven gebildet werden. Als Additive unterscheidet man in der Regel Prozesschemikalien (z.B. Biozide, Entlüfter, Retentionshilfsmittel) und Funktionschemikalien (z.B. Farbstoffe, optische Aufheller, Nassfestmittel). Unter Papier bzw. Papiererzeugnissen im Sinne der vorliegenden Erfindung sind insbesondere grafische Papiere, Bürokommunikationspa- piere, Verpackungspapiere, Hygienepapiere und Spezialpapiere zu verstehen. Als gra- fische Papiere im Sinne der Erfindung sind alle Papiere zu verstehen, die zum Bedrucken beispielsweise im Flexodruck, Hochdruck, Offset-Druck oder Tiefdruck Verwendung finden, z.B. Zeitungsdruckpapiere. Unter Bürokommunikationspapieren sind Schreib-, Druck- und Kopierpapiere zu verstehen, z.B. Fotodruck- und Digitaldruckpa- piere. Unter Verpackungspapieren sind Papiere, Karton und Pappe für Verpackungszwecke zu verstehen, z.B. Wellpappe. Hygienepapiere im Sinne der Erfindung sind Papiere mit hohem spezifischem Volumen und hoher Saugkraft, die typischerweise im Sanitär- und Küchenbereich oder im industriellen Bereich Anwendung finden. Der Ausdruck Spezialpapiere bezeichnet Papiere und Pappen für spezielle technische Ver- wendungszwecke, beispielsweise Dekorpapiere und Filterpapiere. Paper or paper product in the context of the present invention designate flat products made of fibers, in particular from chemically or mechanically exposed plant fibers, which are formed by dehydration of a pulp suspension using at least one screen usually with the addition of fillers and other additives. As additives, a distinction is usually made between process chemicals (eg biocides, deaerators, retention aids) and functional chemicals (eg dyes, optical brighteners, wet strength agents). For the purposes of the present invention, paper or paper products are to be understood in particular as meaning graphic papers, office communication papers, packaging papers, hygiene papers and special papers. As a For the purposes of the invention, fish papers are all papers which are used for printing, for example, in flexographic printing, high-pressure, offset printing or intaglio printing, for example newsprint papers. Office communication papers are to be understood as writing, printing and copying papers, for example photo printing and digital printing papers. Packaging papers are papers, cardboard and cardboard for packaging purposes, eg corrugated board. For the purposes of the invention, tissue papers are papers with a high specific volume and high suction force, which are typically used in the sanitary and kitchen sector or in the industrial sector. The term special papers refers to papers and boards for special technical purposes, such as decor papers and filter papers.
Papiererzeugnisse können je nach ihrer flächenbezogenen Masse in Papier, Pappe und ggf. Karton klassifiziert werden. Gemäß DIN 6730 spricht man bei einer flächenbezogenen Masse von kleiner gleich 225 g/m2 von Papier und größer 225 g/m2 von Pappe. Oft werden auch Papiererzeugnisse mit einer flächenbezogenen Masse im Bereich von 7 bis 150 g/m2 als Papier, im Bereich von 150 bis 600 g/m2 als Karton und ab 600 g/m2 als Pappe bezeichnet. Typischerweise bestehen Karton und Pappe überwiegend aus mehreren Lagen. Depending on their grammage, paper products can be classified into paper, cardboard and possibly cardboard. In accordance with DIN 6730, a basis weight of less than or equal to 225 g / m 2 of paper and greater than 225 g / m 2 of cardboard is used. Often, paper products with a basis weight in the range of 7 to 150 g / m 2 are referred to as paper, in the range of 150 to 600 g / m 2 as cardboard and from 600 g / m 2 as cardboard. Cardboard and paperboard are predominantly made up of several layers.
Insbesondere betrifft die vorliegende Erfindung ein Verfahren wie oben beschrieben, dadurch gekennzeichnet, dass bei Entwässerung der wässrigen Zusammensetzung (Schritt c) ein Faservlies gebildet wird, welches in einem oder mehreren weiteren Ver- fahrensschritt(en) gepresst und/oder getrocknet wird. In particular, the present invention relates to a method as described above, characterized in that when dewatering the aqueous composition (step c) a nonwoven fabric is formed, which is pressed and / or dried in one or more further process step (s).
Insbesondere handelt es sich bei der wässrigen Zusammensetzung um eine Suspension (Aufschlämmung) eines Faserstoffes in Wasser. In der wässrigen Zusammenset- zung können weitere gelöste, kolloidal gelöste oder feste Bestandteile enthalten sein. Insbesondere handelt es sich um dem Fachmann bekannte Bestandteile, welche im Rahmen der Herstellung von Papiererzeugnissen eingesetzt werden bzw. anfallen. In particular, the aqueous composition is a suspension (slurry) of a pulp in water. The aqueous composition may contain further dissolved, colloidally dissolved or solid constituents. In particular, it is known to those skilled ingredients that are used in the production of paper products or incurred.
Der Faserstoff kann insbesondere ausgewählt werden aus: The pulp may in particular be selected from:
• Zellstoff (ZS), wie Sulfatzellstoff (SA) (auch Kraftzellstoffstoff genannt), Sulfathalbzellstoff, Sulfitzellstoff (Sl); • pulp (ZS), such as sulphate pulp (SA) (also called kraft pulp), sulphate half-pulp, sulphite pulp (S1);
• Holzstoff, wie Holzschliff (HS) (auch Steinschliff oder stone groundwood SGW genannt), Druckschliff (pressurized groundwood PGW), Refiner Holzstoff (refiner mechanical pulp RMP), thermomechanischem Holzstoff (thermo mechanical pulp TMP), thermomechanischem Holzstoff mit chemischer Vorbehandlung (chemical thermal mechanical pulp CTMP), thermomechanischem Holzstoff mit Natronlauge/Peroxid-Vorbehandlung (BCTMP); • mechanical pulp, such as groundwood (SG), pressurized groundwood (PGW), refiner mechanical pulp (RMP), thermomechanical pulp (TMP), thermomechanical pulp with chemical pretreatment (chemical thermal mechanical pulp CTMP), thermomechanical pulp with caustic soda / peroxide pretreatment (BCTMP);
• Sekundärfaserstoff, wie Altpapier (AP) und deinktes Altpapier (deinked pulp DIP). • Secondary pulp, such as waste paper (AP) and deinked pulp (DIP).
Als Faserstoffe können insbesondere oben beschriebene gebleichte und/oder ungebleichte Zellstoffe und/oder Faserstoffe aus Laub- oder Nadelhölzern verwendet werden. Bevorzugt wird Buchen-Sulfitzellstoff und/oder Langfaser-Sulfatzellstoff einge- setzt. In particular, bleached and / or unbleached pulps and / or fibers of deciduous or softwoods described above may be used as fibrous materials. Preference is given to using beech sulphite pulp and / or long fiber sulphate pulp.
Insbesondere enthält die wässrige Zusammensetzung mindestens einen Faserstoff ausgewählt aus der Gruppe bestehend aus Sulfatzellstoff (SA), Sulfathalbzellstoff, Sulfitzellstoff (Sl), Holzschliff (HS), Druckschliff (PGW), Refiner Holzstoff (RMP), ther- momechanischem Holzstoff (TMP), thermomechanischem Holzstoff mit chemischer Vorbehandlung (CTMP), thermomechanischem Holzstoff mit Natronlauge/Peroxid- Vorbehandlung (BCTMP), Altpapier (AP) und deinktem Altpapier (DIP). In particular, the aqueous composition comprises at least one fibrous material selected from the group consisting of sulphate pulp (SA), sulphate half-cell pulp, sulphite pulp (SI), groundwood (HS), pressure groundwood (PGW), refiner pulp (RMP), thermomechanical pulp (TMP), thermomechanical pulp with chemical pretreatment (CTMP), thermomechanical pulp with caustic soda / peroxide pretreatment (BCTMP), waste paper (AP) and deinked waste paper (DIP).
In einer bevorzugten Ausführungsform wird als Faserstoff mindestens ein Sekundärfa- serstoff, insbesondere Altpapier und/oder deinktes Altpapier (DIP) eingesetzt. In a preferred embodiment, at least one secondary fiber, in particular waste paper and / or deinked waste paper (DIP), is used as the pulp.
Insbesondere bevorzugt enthält die wässrige Zusammensetzung mindestens einen Faserstoff, der alkalisch oxidativ gebleicht wurde. Bevorzugt weist die wässrige Zusammensetzung enthaltend mindestens einen Faserstoff eine Stoffdichte von 0,01 bis 5 %, bevorzugt 0, 1 bis 5 %, insbesondere bevorzugt von 0,2 bis 1 ,4 % auf. Most preferably, the aqueous composition contains at least one pulp which has been bleached by alkaline oxidative. The aqueous composition containing at least one pulp preferably has a pulp density of 0.01 to 5%, preferably 0, 1 to 5%, particularly preferably 0.2 to 1.4%.
Als Stoffdichte einer wässrigen Zusammensetzung enthaltend mindestens einen Fa- serstoff (Faserstoff-Suspension) wird der Prozentsatz der Trockenmasse der abfiltrierbaren Feststoffe in der Zusammensetzung in Bezug auf die Masse der gesamten Zusammensetzung verstanden. Gängigerweise wird die Trockenmasse als absolute Trockenmasse (atro) oder als Trockenmasse bei Trocknung unter Normbedingungen (ofentrocken, otro) angegeben. Die Bestimmung der Stoffdichte von Faserstoff- Suspensionen wird beispielsweise in DIN 54359 (EN ISO 41 19) beschrieben. The consistency of an aqueous composition containing at least one fiber (pulp suspension) is understood as meaning the percentage of the dry mass of the solids which can be filtered off in the composition in relation to the mass of the entire composition. The dry matter is usually stated as absolute dry matter (atro) or as dry matter during drying under standard conditions (oven-dry, otro). The determination of the consistency of pulp suspensions is described for example in DIN 54359 (EN ISO 41 19).
Als weitere Bestandteile kann die wässrige Zusammensetzung mindestens ein übliches dem Fachmann bekanntes Additive (Prozess- und Funktionschemikalien) enthalten. Das Additiv kann ausgewählt werden aus Prozesschemikalien, wie As further constituents, the aqueous composition may comprise at least one customary additive known to the person skilled in the art (process and functional chemicals). The additive can be selected from Process chemicals, like
• Elektrolyt, beispielsweise Aluminiumsulfat, Aluminiumnitrat, Polyaluminiumchlorid (PAC), Aluminiumhydroxidchlorid, anorganische Fällungsmittel  • Electrolyte, for example, aluminum sulfate, aluminum nitrate, polyaluminum chloride (PAC), aluminum hydroxide chloride, inorganic precipitants
Organischem Fällungsmittel  Organic precipitant
Biozid (z.B. Schleimbekämpfungsmittel)  Biocide (e.g., slimicides)
Entlüfter  ventilator
Entschäumer  defoamers
Dispergiermittel  dispersants
Adsorbiermittel (z.B. Talkum)  Adsorbents (e.g., talc)
Fixiermittel (z.B. kurzkettige kationische Polymere)  Fixatives (e.g., short chain cationic polymers)
Retentionshilfsmittel (z.B. langkettige anionische und kationische Polymere, teilweise auch vernetzt)  Retention aids (e.g., long chain anionic and cationic polymers, partially cross-linked)
• Entwässerungsbeschleuniger und Funktionschemikalien, wie  • Drainage accelerators and functional chemicals, such as
Farbstoff  dye
Optischem Aufheller  Optical brightener
Masseleimungsmittel (Harzleim, AKD, ASA, Polymerleimungsmittel) Oberflächenleimungsmittel  Engine sizing agent (rosin size, AKD, ASA, polymer size) surface sizing agent
Nassfestmittel  Wet strength agent
Trockenverfestiger  Dry strength
internal wet web strength polymer (IWWS) Insbesondere enthält die wässrige Zusammensetzung zusätzlich mindestens ein weiteres Additiv ausgewählt aus der Gruppe bestehend aus Aluminiumsulfat, Aluminiumnitrat, Polyaluminiumchlorid (PAC), Aluminiumhydroxidchlorid, organischem Fällungsmittel, Biozid, Entlüfter, Entschäumer, Dispergiermittel, Adsorbiermittel, Fixiermittel, Retentionshilfsmittel, Entwässerungsbeschleuniger, Farbstoff, optischem Aufheller, Masseleimungsmittel, Nassfestmittel, Trockenverfestiger und internal wet web strength polymer (IWWS).  In particular, the aqueous composition additionally contains at least one further additive selected from the group consisting of aluminum sulfate, aluminum nitrate, polyaluminum chloride (PAC), aluminum hydroxide chloride, organic precipitant, biocide, deaerator, defoamer, dispersant, adsorbent, fixer, Retention aid, drainage accelerator, dye, optical brightener, engine sizing agent, wet strength agent, dry strength agent and internal wet web strength polymer (IWWS).
Bevorzugt enthält die wässrige Zusammensetzung zusätzlich mindestens einen anorganischen Füllstoff ausgewählt aus der Gruppe bestehend aus gemahlenem Kalziumkarbonat (grinded calcium carbonate GCC), gefälltem Kalziumkarbonat (precipitated calcium carbonate PCC), Kaolin, Titandioxid und Bariumsulfat, bevorzugt ausgewählt aus der Gruppe bestehend aus gemahlenem Kalziumkarbonat (GCC) und gefälltem Kalziumkarbonat (PCC). Die Einstellung des pH-Wertes einer wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff erfolgt insbesondere durch Zugabe von Methansulfonsäure bis zum Erreichen des gewünschten pH-Wertes bzw. des gewünschten pH-Bereichs. Dem Fachmann sind gängige Verfahren zur Kontrolle des pH-Wertes bekannt. Die Zugabemenge an Methansulfonsäure richtet sich nach Art der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff und deren Ausgangswert des pH- Werts sowie dem gewünschten pH-Zielwert. Preferably, the aqueous composition additionally comprises at least one inorganic filler selected from the group consisting of grinded calcium carbonate (GCC), precipitated calcium carbonate (PCC), kaolin, titanium dioxide and barium sulfate, preferably selected from the group consisting of ground calcium carbonate ( GCC) and precipitated calcium carbonate (PCC). The pH of an aqueous composition comprising at least one fibrous material is adjusted in particular by adding methanesulfonic acid until the desired pH or the desired pH range has been reached. The person skilled in common methods for controlling the pH are known. The amount of methanesulfonic acid added depends on the type of aqueous composition containing at least one pulp and its initial value of the pH and the desired pH target value.
Die Einstellung des pH-Wertes der wässrigen Zusammensetzung enthaltend mindes- tens einen Faserstoff kann durch Zugabe einer Mischung von Säuren enthaltend Methansulfonsäure erfolgen. Es ist weiterhin denkbar, eine Mischung aus Methansulfonsäure und Kohlendioxid oder eine Mischung von Säuren enthaltend Methansulfonsäure und Kohlendioxid einzusetzen. Insbesondere wird Methansulfonsäure als alleiniger Säure zur Einstellung und/oder Stabilisierung des pH- Werts zugegeben. Darüber hinaus ist denkbar die Einstellung bzw. Regulierung des pH-Wertes der wässrigen Zusammensetzung zusätzlich durch Zugabe einer dem Fachmann bekannten Base durchzuführen. The pH of the aqueous composition containing at least one fibrous material can be adjusted by adding a mixture of acids containing methanesulfonic acid. It is also conceivable to use a mixture of methanesulfonic acid and carbon dioxide or a mixture of acids containing methanesulfonic acid and carbon dioxide. In particular, methanesulfonic acid is added as the sole acid to adjust and / or stabilize the pH. In addition, it is conceivable to additionally carry out the adjustment or regulation of the pH of the aqueous composition by adding a base known to the person skilled in the art.
Die vorliegende Erfindung betrifft insbesondere ein Verfahren zur Herstellung eines Papiererzeugnisses wie oben beschrieben, dadurch gekennzeichnet, dass der pH-Wert der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff auf einen Wert im Bereich von 4 bis 1 1 , insbesondere im Bereich von 4,5 bis 6,8, insbesondere im Bereich von 6,8 bis 10,8, eingestellt wird. Betrifft das erfindungsgemäße Verfahren ein Verfahren zur Herstellung eines Papiererzeugnisses unter Verwendung der sauren Fahrweise wird durch Zugabe von Methansulfonsäure insbesondere ein pH-Wert im Bereich von 4,5 bis 6,8 eingestellt. Betrifft das erfindungsgemäße Verfahren ein Verfahren zur Herstellung eines Papiererzeugnisses unter Verwendung der so genannten neutralen Fahrweise (meist unter Ein- satz von Kalziumkarbonat als Füllstoff), so wird bevorzugt der pH-Wert der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff auf einen Bereich von 6,8 bis 10,8; insbesondere von 7,0 bis 7,5 eingestellt. In particular, the present invention relates to a process for producing a paper product as described above, characterized in that the pH of the aqueous composition containing at least one pulp to a value in the range of 4 to 1 1, in particular in the range of 4.5 to 6 8, in particular in the range of 6.8 to 10.8. If the method according to the invention relates to a method for producing a paper product using the acidic method of driving, in particular a pH in the range from 4.5 to 6.8 is set by addition of methanesulfonic acid. If the process according to the invention relates to a process for the production of a paper product using the so-called neutral procedure (usually with use of calcium carbonate as filler), the pH of the aqueous composition containing at least one fibrous material is preferably in the range of 6.8 to 10.8; especially adjusted from 7.0 to 7.5.
Ferner kann das in der vorliegenden Anmeldung beschriebene Verfahren zur Herstel- lung eines Papiererzeugnisse weitere gängige Verfahrensschritte der Papier- bzw. Kartonherstellung enthalten, z.B. Schritte in der Stoffaufbereitung umfassend Dispergierung, Sortierung, Mahlung des Faserstoffes, der Trocknung nachgeschaltete Schritte, wie Kalandrieren, Streichen, Schneiden sowie Schritte betreffend das Ausrüsten. Die Zugabe von Methansulfonsäure zu der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff kann an einem oder mehreren verschiedenen Verfahrensabschnitten des Herstellungsverfahrens des Papiererzeugnisses erfolgen. Insbesondere erfolgt die Zugabe von Methansulfonsäure zu der wässrigen Zusammenset- zung enthaltend mindestens einen Faserstoff im Konstantteil einer Papiermaschine. Furthermore, the process for producing a paper product described in the present application may comprise further conventional process steps of paper or board production, eg steps in stock preparation comprising dispersion, sorting, grinding of the pulp, steps following the drying, such as calendering, brushing, Cutting as well as steps concerning the equipment. The addition of methanesulfonic acid to the aqueous composition containing at least one pulp may occur at one or more different stages of the process of making the paper product. In particular, the addition of methanesulfonic acid to the aqueous composition containing at least one pulp takes place in the constant part of a paper machine.
Als Konstantteil im Sinne der vorliegenden Erfindung bezeichnet man in der Regel alle Anlagenteile und Rohrleitung zwischen der Misch- und Maschinenbütte und dem Stoffauflauf der Papier- bzw. Kartonmaschine. Im so genannten konstanten Teil (Konstantteil) wird die Faserstoff-Suspension für die nachfolgende Blattbildung in der Siebpartie maschinenfertig gemacht. Hier wird beispielsweise die End- bzw. Ausgleichsmahlung des Faserstoffs durchgeführt, die Stoffmengen und Stoffdichten reguliert, sowie die Regelung der Strömungsgeschwindigkeiten durchgeführt. Im Konstantteil der Papier- bzw. Kartonmaschine erfolgt insbesondere eine gleichmäßige Verdünnung der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff (Faserstoff-Suspension) von etwa 3 bis 5 % Stoffdichte (Dickstoff) auf etwa 0,2 bis 1 ,4 % Stoffdichte. Zudem kann die Faserstoff-Suspension von Faserbündeln, Sand, Kunststoffen etc. gereinigt. Dies erfolgt insbesondere in der so genannten Stoff- Feinsortierung beispielsweise über Zentrifugal-, Druck- und/ oder Vibrationssortierer. Innerhalb des Konstantteiles kann zudem das Zudosieren von Füllstoffen, Prozesschemikalien und/oder Funktionschemikalien erfolgen. Im Konstantteil der Papier- bzw. Kartonmaschine erfolgt in der Regel auch das Einstellen des pH-Wertes der Faserstoff- Suspension. Besonders bevorzugt erfolgt die Zugabe von Methansulfonsäure zum Einstellen des pH-Wertes vor, nach und/oder während der Stoff-Feinsortierung der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff. Die Stoff-Feinsortierung erfolgt insbesondere mittels gängiger Sortieraggregate, z.B. Zentrifugal-, Druck- und/oder Vibrationssortierer. Bevorzugt erfolgt die Zugabe von Methansulfonsäure vor dem letz- ten Sortieraggregat vor dem Stoffauflauf. As a constant part for the purposes of the present invention is generally referred to all parts of the plant and pipeline between the mixing and machine chest and the headbox of the paper or board machine. In the so-called constant part (constant part), the pulp suspension is made ready for subsequent sheet formation in the wire section. Here, for example, the final or Ausgleichsmahlung the pulp is performed, which regulates substance quantities and material densities, as well as the control of the flow rates performed. In the constant part of the paper or board machine is in particular a uniform dilution of the aqueous composition containing at least one pulp (pulp suspension) of about 3 to 5% consistency (thick stock) to about 0.2 to 1, 4% consistency. In addition, the pulp suspension of fiber bundles, sand, plastics, etc. cleaned. This is done in particular in the so-called fabric fine sorting, for example via centrifugal, pressure and / or vibration sorters. Within the constant part, it is also possible to meter in fillers, process chemicals and / or functional chemicals. In the constant part of the paper or board machine is usually also the adjustment of the pH of the pulp suspension. Particularly preferably, the addition of methanesulfonic acid to adjust the pH before, after and / or during the textile fine sorting of the aqueous composition containing at least one pulp. The fabric fine sorting takes place in particular by means of conventional sorting units, e.g. Centrifugal, pressure and / or vibration sorters. The addition of methanesulfonic acid preferably takes place before the last sorting unit in front of the headbox.
Generell lässt sich das erfindungsgemäße Verfahren zur Herstellung aller dem Fachmann bekannter Papiererzeugnisse einsetzen. Insbesondere betrifft das erfindungsgemäße Verfahren die Herstellung eines Papiererzeugnis ausgewählt aus graphi- schem Papier, Bürokommunikationspapier, Verpackungspapier, Karton, Pappe, Hygienepapier und Spezialpapier, bevorzugt ein Verfahren zur Herstellung eines graphischen Papiers oder eines Bürokommunikationspapier. In einer bevorzugten Ausführungsform betrifft die Erfindung ein Verfahren zur Herstellung eines Papiererzeugnisses, dadurch gekennzeichnet, dass das Papiererzeugnis ein Verpackungsmaterial für den Lebensmittelbereich ist. Weiterhin ist die vorliegende Anmeldung gerichtet auf die Verwendung von Methansulfonsäure bei der Herstellung eines Papiererzeugnisses. Insbesondere umfasst die erfindungsgemäße Verwendung von Methansulfonsäure bei der Herstellung eines Papiererzeugnisses das Einstellen des pH-Wertes einer wässri- gen Zusammensetzung enthaltend mindestens einen Faserstoff. In general, the process according to the invention can be used for the production of all paper products known to the person skilled in the art. In particular, the method according to the invention relates to the production of a paper product selected from graphic paper, office communication paper, packaging paper, cardboard, cardboard, tissue paper and special paper, preferably a method for producing a graphic paper or office communication paper. In a preferred embodiment, the invention relates to a method for producing a paper product, characterized in that the paper product is a packaging material for the food sector. Furthermore, the present application is directed to the use of methanesulfonic acid in the manufacture of a paper product. In particular, the use according to the invention of methanesulfonic acid in the production of a paper product comprises adjusting the pH of an aqueous composition comprising at least one fibrous material.
Insbesondere betrifft die erfindungsgemäße Verwendung von Methansulfonsäure die Herstellung von Papiererzeugnissen auf industriell gängigen Papier- und/oder Kartonmaschinen. Bevorzugt umfasst die Verwendung von Methansulfonsäure das Einstellen des pH-Wertes einer wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff im Konstantteil einer Papier- und oder Kartonmaschine. Besonders bevorzugt kann die Methansulfonsäure vor dem Stoffauflauf verwendet werden. In particular, the use of methanesulfonic acid according to the invention relates to the production of paper products on industrially common paper and / or board machines. Preferably, the use of methanesulfonic acid comprises adjusting the pH of an aqueous composition containing at least one pulp in the constant part of a paper and board machine. Particularly preferably, the methanesulfonic acid can be used before the headbox.
Insbesondere betrifft die Erfindung die Verwendung von Methansulfonsäure bei der Herstellung eines Papiererzeugnisses ausgewählt aus graphischem Papier, Bürokommunikationspapier, Verpackungspapier, Karton, Pappe, Hygienepapier und Spezialpa- pier, insbesondere ein Verpackungsmaterial für den Lebensmittelbereich. In particular, the invention relates to the use of methanesulfonic acid in the manufacture of a paper product selected from graphic paper, office communication paper, packaging paper, cardboard, cardboard, tissue paper and special paper, in particular a packaging material for the food industry.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines Papiererzeugnisses enthaltend die folgenden Schritte: 1. A process for producing a paper product comprising the following steps:
a) Bereitstellen einer wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff; b) Zugabe von Methansulfonsäure zu der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff zum Einstellen des pH-Wertes; c) Entwässerung der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff.  a) providing an aqueous composition containing at least one pulp; b) adding methanesulfonic acid to the aqueous composition containing at least one pulp to adjust the pH; c) dewatering the aqueous composition containing at least one pulp.
Verfahren gemäß Anspruch 1 , dadurch gekennzeichnet, dass bei Entwässerung der wässrigen Zusammensetzung (Schritt c) ein Faservlies gebildet wird, welches in einem oder mehreren weiteren Verfahrensschritt(en) gepresst und/oder getrocknet wird. A method according to claim 1, characterized in that when dehydrating the aqueous composition (step c) a nonwoven fabric is formed, which in one or more further process step (s) is pressed and / or dried.
Verfahren gemäß einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass als Faserstoff mindestens ein Faserstoff eingesetzt wird ausgewählt aus der Gruppe bestehend aus Sulfatzellstoff (SA), Sulfathalbzellstoff, Sulfitzellstoff (Sl), Holzschliff (HS), Druckschliff (PGW), Refiner Holzstoff (RMP), Thermomechani- schem Holzstoff (TMP), Thermomechanischem Holzstoff mit chemischer Vorbehandlung (CTMP), Thermomechanischem Holzstoff mit Natronlauge/Peroxid- Vorbehandlung (BCTMP), Altpapier (AP) und deinktem Altpapier (DIP). Method according to one of claims 1 or 2, characterized in that at least one pulp is selected from the group consisting of sulphate pulp (SA), sulphate pulp, sulphite pulp (Sl), groundwood (HS), pressure groundwood (PGW), refiner pulp (RMP), thermomechanical pulp (TMP), thermomechanical pulp with chemical pretreatment (CTMP), thermomechanical pulp with caustic soda / peroxide pretreatment (BCTMP), waste paper (AP) and deinked waste paper (DIP).
Verfahren gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die wässrige Zusammensetzung mindestens einen Faserstoff enthält, der alkalisch oxidativ gebleicht wurde. A method according to any one of claims 1 to 3, characterized in that the aqueous composition contains at least one pulp which has been bleached by alkaline oxidative.
Verfahren gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass als Faserstoff mindestens einen Sekundärfaserstoff eingesetzt wird. Method according to one of claims 1 to 4, characterized in that at least one secondary pulp is used as the pulp.
Verfahren gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die wässrige Zusammensetzung enthaltend mindestens einen Faserstoff eine Stoffdichte von 0,01 bis 5 % aufweist. Method according to one of claims 1 to 5, characterized in that the aqueous composition comprising at least one pulp has a consistency of 0.01 to 5%.
7. Verfahren gemäß einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die wässrige Zusammensetzung zusätzlich mindestens ein weiteres Additiv enthält ausgewählt aus der Gruppe bestehend aus Aluminiumsulfat, Aluminiumnit- rat, Polyaluminiumchlorid (PAC), Aluminiumhydroxidchlorid, organischem Fällungsmittel, Biozid, Entlüfter, Entschäumer, Dispergiermittel, Adsorbiermittel, Fixiermittel, Retentionshilfsmittel, Entwässerungsbeschleuniger, Farbstoff, optischem Aufheller, Masseleimungsmittel, Nassfestmittel, Trockenverfestiger und internal wet web strength polymer (IWWS). 7. The method according to any one of claims 1 to 6, characterized in that the aqueous composition additionally contains at least one further additive selected from the group consisting of aluminum sulfate, Aluminiumnit- rat, polyaluminium chloride (PAC), aluminum hydroxide chloride, organic precipitant, biocide, deaerator, defoamer, dispersant, adsorbent, fixer, retention aid, dehydration accelerator, dye, optical brightener, engine sizer, wet strength agent, dry strength and internal wet web strength polymer (IWWS).
Verfahren gemäß einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die wässrige Zusammensetzung zusätzlich mindestens einen anorganischen Füllstoff enthält ausgewählt aus der Gruppe bestehend aus gemahlenem Kalziumkarbonat (GCC), gefälltem Kalziumkarbonat (PCC), Kaolin, Titandioxid und Bariumsulfat. A method according to any one of claims 1 to 7, characterized in that the aqueous composition additionally contains at least one inorganic filler selected from the group consisting of ground calcium carbonate (GCC), precipitated calcium carbonate (PCC), kaolin, titanium dioxide and barium sulfate.
9. Verfahren gemäß einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der pH-Wert der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff auf einen Wert im Bereich von 4 bis 11 eingestellt wird. 9. The method according to any one of claims 1 to 8, characterized in that the pH of the aqueous composition containing at least one pulp is adjusted to a value in the range of 4 to 11.
10. Verfahren gemäß einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Zugabe von Methansulfonsäure zu der wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff im Konstantteil einer Papiermaschine erfolgt. 10. The method according to any one of claims 1 to 9, characterized in that the addition of methanesulfonic acid to the aqueous composition containing at least one pulp takes place in the constant part of a paper machine.
1 1. Verfahren gemäß einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass das Papiererzeugnis ausgewählt ist aus graphischem Papier, Bürokommunikationspapier, Verpackungspapier, Karton, Pappe, Hygienepapier und Spezialpa- pier. 1 1. A method according to any one of claims 1 to 10, characterized in that the paper product is selected from graphic paper, office communication paper, packaging paper, cardboard, cardboard, tissue paper and special paper pier.
12. Verfahren gemäß einem der Ansprüche 1 bis 1 1 , dadurch gekennzeichnet, dass das Papiererzeugnis ein Verpackungsmaterial für den Lebensmittelbereich ist. 12. The method according to any one of claims 1 to 1 1, characterized in that the paper product is a packaging material for the food industry.
13. Verwendung von Methansulfonsäure bei der Herstellung eines Papiererzeugnisses. 13. Use of methanesulfonic acid in the manufacture of a paper product.
14. Verwendung gemäß Anspruch 13, dadurch gekennzeichnet, dass die Verwendung von Methansulfonsäure das Einstellen des pH-Wertes einer wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff umfasst. 14. Use according to claim 13, characterized in that the use of methanesulfonic acid comprises adjusting the pH of an aqueous composition comprising at least one pulp.
15. Verwendung gemäß Anspruch einem der Ansprüche 13 oder 14, dadurch gekennzeichnet, dass die Verwendung von Methansulfonsäure das Einstellen des pH-Wertes einer wässrigen Zusammensetzung enthaltend mindestens einen Faserstoff im Konstantteil einer Papier- und/oder Kartonmaschine umfasst. Use according to any one of claims 13 or 14, characterized in that the use of methanesulphonic acid comprises adjusting the pH of an aqueous composition containing at least one pulp in the constant part of a paper and / or board machine.
EP12700713.6A 2011-01-25 2012-01-25 Method for producing a paper product Not-in-force EP2668333B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12700713.6A EP2668333B1 (en) 2011-01-25 2012-01-25 Method for producing a paper product

Applications Claiming Priority (3)

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EP11152045 2011-01-25
EP12700713.6A EP2668333B1 (en) 2011-01-25 2012-01-25 Method for producing a paper product
PCT/EP2012/051071 WO2012101137A1 (en) 2011-01-25 2012-01-25 Method for producing a paper product

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EP2668333A1 true EP2668333A1 (en) 2013-12-04
EP2668333B1 EP2668333B1 (en) 2014-10-29

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EP2924166A1 (en) * 2014-03-25 2015-09-30 Basf Se Method for the manufacture of bleached wood fibre
CN106317952B (en) * 2016-08-19 2018-03-09 福建中烟工业有限责任公司 A kind of Lightening compositions, preparation method and the usage
CN106868924A (en) * 2016-12-30 2017-06-20 芜湖市哈贝纸业有限公司 A kind of incompressible fluting medium
CN106835832A (en) * 2016-12-30 2017-06-13 芜湖市哈贝纸业有限公司 A kind of antibacterial and mouldproof packing case paper
CN109610233B (en) * 2018-12-14 2021-09-14 玖龙纸业（东莞）有限公司 Surface glue solution modifier for kraft paper and white kraft paper and preparation method thereof

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EP2668333B1 (en) 2014-10-29
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BR112013019045A2 (en) 2017-01-31
CN103384742A (en) 2013-11-06

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