EP4291706A1 - Charge - Google Patents

Charge

Info

Publication number
EP4291706A1
EP4291706A1 EP22706030.8A EP22706030A EP4291706A1 EP 4291706 A1 EP4291706 A1 EP 4291706A1 EP 22706030 A EP22706030 A EP 22706030A EP 4291706 A1 EP4291706 A1 EP 4291706A1
Authority
EP
European Patent Office
Prior art keywords
paper
flotate
titanium dioxide
weight
filler
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.)
Pending
Application number
EP22706030.8A
Other languages
German (de)
English (en)
Inventor
Felix EBERSPÄCHER
Heiko ZIPPENFENIG
Frank HEYNE
Demeter TARASZENKO
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.)
Koehler Innovation and Technology GmbH
Original Assignee
Koehler Innovation and Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koehler Innovation and Technology GmbH filed Critical Koehler Innovation and Technology GmbH
Publication of EP4291706A1 publication Critical patent/EP4291706A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper
    • D21B1/325—Defibrating by other means of waste paper de-inking devices
    • D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H21/50—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 characterised by form
    • D21H21/52—Additives of definite length or shape
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/18—Paper- or board-based structures for surface covering
    • D21H27/22—Structures being applied on the surface by special manufacturing processes, e.g. in presses
    • D21H27/26—Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • the present invention relates to a process for producing a filler for paper, the filler obtainable by this process, a paper containing this filler and the use of such a paper as decorative paper.
  • the main components of paper are fibrous materials, the main source of which is wood.
  • fibrous materials can also be obtained from the recycling of paper that has already been used, ie waste paper.
  • non-fibrous papermaking additives are fillers such as pigments.
  • Kaolin, calcium carbonate, magnesite and/or titanium dioxide can be used as fillers. These serve, among other things, to improve smoothness, printability and to influence the degree of whiteness and opacity of the paper.
  • titanium dioxide is used as a filler.
  • a process for the recycling of fillers and coating pigments from paper, paperboard and cardboard production from the residual water sludge Coating waste water, deinking plants, internal sewage treatment plants or separating devices is known from DE 196 27 523 CI.
  • Fiber-containing residual water sludges containing fillers and coating pigments or residual water sludges in which the fibers have been mechanically/or chemically separated e.g. by flotation to obtain a flotate
  • a pigment suspension with fresh pigment or fresh filler as a powder, fresh pigment-containing suspension and/or fresh filler-containing suspension.
  • the flotate from paper recycling usually includes titanium dioxide as flaked titanium dioxide with an average particle size of more than 2 ⁇ m.
  • Such a flotate thus only brings ash into a paper, but does not contribute to the opacity of the paper, since only titanium dioxide with an average particle size between 300 nm and 400 nm contributes to the opacity of the paper.
  • ash refers to the inorganic, non-combustible fraction in the paper.
  • the ash may include fillers, contaminants, and pigments.
  • the ash content i.e. the type, quantity and composition of the fillers, determines the properties, quality and production costs of a paper, among other things. In particular, the resulting opacity is important.
  • the composition of an ash can be of high quality and expensive (e.g. high proportion of titanium dioxide) or inferior and inexpensive.
  • "ash" is usually - apart from titanium dioxide - cheaper than organic fibers, on the other hand, new paper properties can be achieved through the addition and composition of the ash are generated and improved, and manufacturing processes are technically and energetically optimized.
  • a high ash content can also impair the performance of a paper machine, since tears can occur more easily due to a reduced breaking load of the paper and the running speed has to be reduced accordingly.
  • the object of the present invention to eliminate the disadvantages mentioned above and to provide a method for producing a filler and a filler obtainable by this method, the filler bringing high opacity to the paper and at the same time as much titanium dioxide as possible being saved. Accordingly, a high ash retention is desirable in order not to lose any raw materials. Furthermore, this filler should cause a paper to have a high opacity and breaking load.
  • the invention also relates to a filler obtainable by this method.
  • This process makes it possible to provide a filler that can introduce a high degree of opacity into a paper and at the same time requires as little "fresh" titanium dioxide as possible. With this and the high ash retention, titanium dioxide can be saved.
  • a further feature of the filler is that the use of this filler has little adverse effect on the performance of a paper machine and can therefore be operated economically.
  • a paper comprising such a filler is distinguished, inter alia, by a high opacity and an advantageous breaking load.
  • a component of the filler comprises a flotate containing titanium dioxide from a paper refining, where the flotate has been mechanically and/or chemically treated.
  • waste paper When paper is recycled, waste paper is usually beaten with water in a pulper.
  • the recovered fibers are then usually freed from coarser impurities and then subjected to fine screening.
  • deinking process the fiber mixture is largely removed from the fiber mixture using flotation or washing processes, including printing inks and fillers.
  • the other particles present in the stock suspension after the defibration stage and separated from the fibers such as paint particles or fillers, are attached to air bubbles by collector chemicals in the flotation process and are transported by these to the surface of a flotation cell.
  • a dirt-laden foam is formed which, in addition to the detached paint particles, can also contain fibers and fillers. Furthermore, a fraction remains in the flotation cell, which can also be referred to as residual water sludge.
  • the resulting foam which preferably represents the flotate, is skimmed off, cleaned and can be used as ash in papermaking.
  • the residual water sludge can be worked up or discarded using other methods, such as those described in DE 196 27 523 CI, for example.
  • the flotate is therefore to be distinguished from the fraction remaining in the flotation cell (residual water sludge).
  • the inventors have discovered that such a flotate can be used to advantage if it is also mechanically and/or chemically treated and mixed with titanium dioxide.
  • the titanium dioxide added here is "fresh” titanium dioxide, i.e. titanium dioxide that is not obtained from paper recycling.
  • Suitable titanium dioxide includes rutile, preferably obtained by a chloride and/or sulphate manufacturing process, especially anatase.
  • Suitable titanium dioxide is known, for example, under the trade names titanium dioxide chloride Tiona RCL-722, titanium dioxide chloride KRONOS 2800, titanium dioxide sulfate LOMON LR-952, titanium dioxide Cinkarna RC-87, TITANIUM DIOXIDE sulfate HOMBITAN R 610 L or titanium dioxide sulfate NR 950.
  • the method according to the invention is preferably characterized in that the flotate is removed by flotation with the aid of compressed air supply and addition of flocculant, in particular an anionic flocculant, such as S-FLOCS-A21 from Servophil AG, preferably in a recovery plant, preferably from Krofta , to remove titanium dioxide from the white water and make it available for paper production.
  • flocculant in particular an anionic flocculant, such as S-FLOCS-A21 from Servophil AG, preferably in a recovery plant, preferably from Krofta , to remove titanium dioxide from the white water and make it available for paper production.
  • such a flotate can also contain fines (pulp), pigments such as iron oxide, kaolins and/or silicates.
  • the flotate is treated only mechanically.
  • the flotate is treated only chemically.
  • the flotate is treated mechanically and chemically.
  • the mechanical and chemical treatment can take place one after the other.
  • the mechanical and chemical treatment can also take place simultaneously.
  • a chemical treatment is preferably carried out first, then a mechanical treatment and then a further chemical treatment.
  • the chemical treatment of the flotate before the mechanical treatment comprises a chemical destabilization step.
  • the large anionically flocculated aggregates (according to the PO2
  • the cationic polymer is preferably used in an amount of 0.5 to 5 ppm. % by weight dry, based on the total amount of flotate flowing through.
  • the reverse system can also be used.
  • cationically flocculated aggregates are generated in order to recover PO2 from the white water, and then the system is reloaded by adding strongly anionic deflocculating agents such as aqueous or latex-containing solution of strongly anionically charged polyacrylamides, e.g. S-FLOCS-A82 from Servophil AG.
  • the anionic deflocculating agent is preferably used in an amount of 0.5 to 5 ppm, based on the total amount of flotate flowing through.
  • the method according to the invention is also preferably characterized in that the mechanical treatment of the flotate includes the use of shearing forces.
  • shearing forces are preferably generated by a set comprising a rotor and a stator.
  • a unit comprising the appropriate set can be installed directly in a line through which the flotate is conveyed in order to achieve a high shear rate.
  • the degree of mechanical treatment can be determined by the speed of the motor or its frequency with the shear forces generated accordingly, which are determined separately for each set.
  • the principle here is a flow through the flotate through a rotating and a stationary part of the set of the unit, which is preferably identical to the refiner or deflaker.
  • Several units of the set comprising a rotor and a stator, can be connected in series or in parallel.
  • multiple units of the assembly (e.g., two) comprising a rotor and a stator are connected in series.
  • Such an arrangement has the advantage of an overall longer (e.g. twice as long when using 2 machines) residence time of the flotate in the clothing and a greater energy input into the flotate.
  • Such an arrangement has the advantage that a large quantity of flotate can be processed in a shorter time and clothings connected in parallel can serve as a backup for a failed clothing without a greater technical outlay being necessary for this.
  • Combinations of sets connected in series and in parallel, comprising a rotor and a stator, are also possible.
  • the method according to the invention preferably comprises a step of chemical stabilization by adding a dispersing agent, preferably an anionic dispersant. This step is preferable to ensure and maintain the crushing effect for the necessary time.
  • the method according to the invention is further preferably characterized in that the chemical treatment of the flotate comprises incubating the flotate with a dispersing agent, preferably an anionic dispersing agent.
  • a dispersing agent preferably an anionic dispersing agent.
  • Suitable anionic dispersants include, for example, acrylic acid polymers or acrylate polymers.
  • Suitable anionic dispersing agents are known, for example, under the trade names Topsperse GX N from COATEX, Dispex AA 4140 from BASF or Si DISP PA4 from Servophil AG.
  • the dispersants preferably the anionic dispersants, are preferably used in an amount of from 0.1 to 2.0% by weight atro, based on the atro amount of the titanium dioxide in the flotate.
  • the chemical treatment of the flotate is advantageous because it allows the individual particles of the titanium dioxide, in particular the titanium dioxide particles formed during the shearing, to be stabilized in terms of charge for a short period of time.
  • Such a mechanically and/or chemically treated flotate has the advantage that the flaked titanium dioxide (particle size larger than 2 ⁇ m) originally contained in the flotate is processed in such a way that the particle size is reduced to around 300 nm to 400 nm and thus the opacity of a paper, preferably with the same ash content.
  • the chemical and mechanical treatment of the flotate comprises a first chemical stabilization step as defined above, a second mechanical treatment step as defined above and a third chemical stabilization step as described above.
  • the chemical and mechanical treatment of the flotate includes a first step of chemical stabilization, with large anionically flocculated aggregates (after the PO2 recovery plant (Krofta)) being heavily recharged by adding cationic polymer, which preferably serves as a deflocculant, a second step of mechanical treatment using shearing forces and a third step of chemical stabilization by adding a dispersing agent, preferably an anionic dispersing agent.
  • the method according to the invention is also preferably characterized in that the flotate from paper recycling contains between 0.5% by weight and 5% by weight titanium dioxide. This concerns the titanium dioxide content before the mechanical and/or chemical treatment.
  • the method according to the invention is further preferably characterized in that the flotate from paper recycling comprises titanium dioxide with an average particle size of greater than 2 ⁇ m.
  • the method according to the invention is further preferably characterized in that the mechanically and/or chemically treated flotate comprises titanium dioxide with an average particle size of 300 nm to 400 nm, preferably 320 nm to 400 nm.
  • a particle size of 320 nm to 400 nm is particularly preferred since titanium dioxide particles of this size are particularly advantageous for achieving high opacity in a paper.
  • the mean particle size can be determined by laser diffraction.
  • the D50 median value is determined as the main measurement parameter.
  • the method according to the invention is also preferably characterized in that the mixing ratio of the mechanically and/or chemically treated flotate and the titanium dioxide is from 40% by weight to 60% by weight to 60% by weight to 40% by weight. Suitable mixing ratios of the mechanically and/or chemically treated flotate and the titanium dioxide are, for example, 50% by weight to 50% by weight or 56% by weight to 44% by weight.
  • Such mixing ratios are particularly advantageous because they reflect the real situation on the paper machine and ensure maximum efficiency or yield coefficient of the paper machine based on titanium dioxide consumption.
  • the process according to the invention for producing a filler for paper can be operated as an independent process.
  • the filler obtained can be filled, stored or transported in order to be used at a different time and/or at a different location.
  • the method according to the invention is preferred, characterized in that the method according to the invention is integrated in a paper production plant.
  • the method according to the invention is integrated into a paper production plant as follows. All of the equipment can be installed as a new/converted installation in the flotation line between Krofta or the titanium dioxide recovery plant and the main line of the paper machine before the vertical sifter.
  • the present invention also relates to a filler obtainable by the process described above.
  • the present invention also relates to a paper containing the filler obtainable by the process described above.
  • the paper according to the invention is preferably characterized in that the paper contains 10% by weight to 50% by weight of filler, based on the total weight of the paper.
  • the filler is preferably a mixture of the mechanically and/or chemically treated flotate and titanium dioxide, the mixing ratio of the mechanically and/or chemically treated flotate and the titanium dioxide being from 40% by weight to 60% by weight to 60% by weight. to 40% by weight.
  • Suitable mixing ratios of the mechanically and/or chemically treated flotate and the titanium dioxide are also, for example, 50% by weight to 50% by weight or 56% by weight to 44% by weight.
  • the paper according to the invention is preferably characterized in that the paper has an ash content of 10% by weight to 50% by weight, based on the total mass of the paper.
  • the paper according to the invention is preferably characterized in that the paper has an ash retention of at least 75% with an ash content of 39 to 42% and/or of at least 85% with an ash content of 34 to 37.5% and/or of at least 85% or 87% with an ash content of 29 to 32%.
  • Ash retention (AR) is calculated as follows:
  • StWG stands for the material water mixture. (T1O2) powder refers to the "fresh" titanium dioxide.
  • T1O2 sheet refers to the total amount of titanium dioxide in the paper.
  • T1O2) StWG refers to the total amount of titanium dioxide in the water mixture.
  • T1O2 in vol. refers to the proportion of titanium dioxide in the flotate.
  • the paper according to the invention is preferably characterized in that the paper has an opacity of at least 80% or at least 90% or at least 91% or at least 92% or at least 93% and at most 99%.
  • the opacity is determined as follows.
  • sheets of paper are impregnated with a melamine resin, dried and then pressed onto a chipboard against a white and black background.
  • the sheet of paper on the plate is then measured with the "Datacolor Spectraflash 800V" spectrophotometer.
  • the mean value is determined from three measured values in each case. Outliers are removed before averaging.
  • the CIELAB L, a, b values are determined over a white, black, background (chipboard).
  • the values are automatically calculated by the program on the colorimeter.
  • the paper according to the invention is preferably characterized in that the paper has a breaking load of at least 15N/15mm width, preferably at least 20N/15mm width.
  • the breaking load is determined by the following method.
  • the paper strips (15mm width) are first clamped and straightened so that they do not touch the measuring surface.
  • the tensile test is started in automatic mode and the demolition is awaited.
  • the determined values can be read on the device.
  • a suitable measuring device is, for example, the "Horizontal strength tester K465" from Messmer8iBüchel.
  • the paper according to the invention is preferably characterized in that the paper has a wet breaking load of at least 5N/15mm width, preferably at least 6N/15mm width.
  • the wet breaking load is determined by the following method.
  • the paper is post-cured in a drying cabinet at about 105° C. for about 3 minutes.
  • the paper strips (15mm wide) are then left in a water tank for about 10 seconds or according to the appropriate quality specifications. Excess water is couched off.
  • the paper strips (15 mm wide) are then clamped and straightened so that they do not touch the measuring surface.
  • the tensile test is started in automatic mode and the demolition is awaited.
  • the determined values can be read on the device.
  • a suitable measuring device is, for example, the "Horizontal strength tester K465" from Messmer & Büchel.
  • the present invention also relates to the use of the paper defined above as decorative paper.
  • decor papers Special papers for surface finishing, e.g. of wood-based materials, are generally referred to as decor papers.
  • Known decorative papers are mainly produced from hardwood pulp. Such decorative papers can either be used directly in one color or printed with different designs. These are used, for example, on furniture surfaces, floors and panels.
  • Example 1 Various papers with untreated and treated flotate were produced and analyzed. The results are summarized in Tables 1 to 3 below.
  • the flotate came from a conventional paper machine and was treated as follows.
  • the TiC>2 content in the flotate was at a level of 2.7% by weight.
  • the flotate was mixed and stabilized with an anionic dispersing agent (Topsperse GX N from COATEX) in a ratio of 0.8% by weight (absolute dry/absolute dry) based on the T1O2 proportion with simultaneous shearing.
  • the shearing was generated by an "Ultra Turrax CAT X1740" at a frequency of 250 Hz in 30 seconds.
  • the treated portion of the flotate had a mass of 300 g.
  • the papers examined had the following key data:
  • Pulp per Pot g: 50 Opacity, %: 90-93
  • StWG substance water mixture
  • AL brightness difference
  • EKA trade name of the retention aid
  • EKA NP opacity degree of impermeability
  • Wet Opacity Opacity of the impregnated and pressed paper, determined as defined above in the specification.
  • Color distance (according to CIELab color space).
  • the color level can be calculated by the following formula (in automatic mode)
  • the breaking load and wet breaking load of various papers were examined. The results are summarized in Table 6.
  • the paper according to the invention has a higher breaking load and wet breaking load.
  • the breaking load and the wet breaking load were determined as defined in the description.
  • FIG. 2 STD 50% by weight TiO 2 , 50% by weight untreated flotate, 40% by weight ash, 80 gsm
  • FIG. 3 VI 50% by weight TiC>2, 50% by weight treated flotate, 0.1% by weight atro dispersant based on atro titanium dioxide in the flotate - 30 seconds - 250 Hz - batch, 40% by weight ash , 80 gsm
  • Figure 4 C2 50% by weight T1O2, 50% by weight treated flotate, 0.4% by weight - atro dispersant based on atro titanium dioxide in the flotate - 30 seconds - 250Hz - batch, 40% by weight ash, 80 gsm
  • FIG. 5 C3 50% by weight T1O2, 50% by weight treated flotate, 0.8% by weight atro dispersant based on atro titanium dioxide in the flotate—30 seconds—250 Hz—batch, 40% by weight ash, 80 gsm
  • FIG. 3 shows the SEM images of paper that was produced with a treated flotate.
  • the treatment was carried out with the Ultra Turrax at a rotor frequency of 250 Hz, with a processing time of 30 seconds and by adding 0.1% by weight dry of an anionic dispersing agent (Topsperse GX N from COATEX). It can be seen that the surface has remained relatively closed, although the number of titanium dioxide agglomerates has decreased and individual particles can be seen.
  • FIG. 4 shows SEM images of paper that was produced with a treated flotate.
  • the treatment was carried out with the Ultra Turrax at a rotor frequency of 250 Hz, with a processing time of 30 seconds and by adding 0.4% by weight dry of an anionic dispersing agent (Topsperse GX N from COATEX).
  • Topicsperse GX N from COATEX
  • the surface has become more porous, what is very advantageous for a decorative paper.
  • the cellulose fibers are better and more completely covered with the individual titanium dioxide particles and the individual particles can be registered clearly and massively.
  • FIG. 5 shows SEM images of paper that was produced with a treated flotate.
  • the treatment was carried out with the Ultra Turrax at a rotor frequency of 250 Hz, with a processing time of 30 seconds and by adding 0.8% by weight dry of an anionic dispersing agent (Topsperse GX N from COATEX).
  • the surface is porous, which is very advantageous for a decorative paper.
  • the pulp fibers are almost completely covered with the individual titanium dioxide particles and the individual particles can be clearly and massively registered. Agglomerates of titanium dioxide are hardly recognizable.
  • FIG. 1 A system or prototype for the mechanical and chemical treatment of a flotate on a paper machine was installed in the line of the PO2 recovery plant - Hydromix. The scheme of the production plant is shown in FIG.
  • the two units (1) are installed in parallel in the line (2) in order to be able to process the entire volume flow.
  • the dispersing agent is dosed from a container that acts as a dosing station
  • the dosing pump (5) is denoted by the dosing pump (5).
  • the control of the units and the generation of the shearing forces is controlled via a frequency control (3).
  • the volume flow of the flotate is continuously monitored and the dosing of the dispersing agent is adjusted accordingly.
  • the entire volume flow of the flotate can be divided and routed through the control valves (6).

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

La présente invention concerne un procédé de production d'une charge pour papier, comprenant les étapes consistant à fournir des résidus de flottaison à partir du retraitement de papier, les résidus de flottaison contenant du dioxyde de titane ; à traiter mécaniquement et/ou chimiquement lesdits résidus de flottaison ; et à mélanger les résidus de flottaison traités mécaniquement et/ou chimiquement avec du dioxyde de titane. L'invention concerne en outre la charge pouvant être obtenue selon ledit procédé, un papier contenant ladite charge et l'utilisation d'un tel papier en tant que papier décoratif. 10
EP22706030.8A 2021-02-15 2022-02-10 Charge Pending EP4291706A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021103520.1A DE102021103520A1 (de) 2021-02-15 2021-02-15 Füllstoff
PCT/EP2022/053239 WO2022171737A1 (fr) 2021-02-15 2022-02-10 Charge

Publications (1)

Publication Number Publication Date
EP4291706A1 true EP4291706A1 (fr) 2023-12-20

Family

ID=80448782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22706030.8A Pending EP4291706A1 (fr) 2021-02-15 2022-02-10 Charge

Country Status (5)

Country Link
EP (1) EP4291706A1 (fr)
CN (1) CN116867941A (fr)
CA (1) CA3208423A1 (fr)
DE (1) DE102021103520A1 (fr)
WO (1) WO2022171737A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU168869B (fr) 1971-02-22 1976-07-28
AU689715B2 (en) 1995-04-11 1998-04-02 Ecc International Limited Treatment of solid-containing material derived from effluent
DE19627523C1 (de) 1996-07-09 1997-10-23 Alpha Calcit Fuellstoff Gmbh Verfahren zur Wiederverwertung von Füllstoffen und Streichpigmenten der Papier-, Pappe- und Kartonherstellung
DE10115570B4 (de) * 2001-03-28 2005-09-08 Technocell Dekor Gmbh & Co. Kg Dekorrohpapier mit verbesserter Opazität
AT501868B1 (de) * 2005-06-13 2007-04-15 Andritz Ag Maschf Verfahren zur wiederverwertung von füllstoffen und streichpigmenten der papier-, pappe- oder kartonherstellung

Also Published As

Publication number Publication date
CN116867941A (zh) 2023-10-10
WO2022171737A1 (fr) 2022-08-18
DE102021103520A1 (de) 2022-08-18
CA3208423A1 (fr) 2022-08-18

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