EP4143380A1 - Procédé de production de papier d'étiquettes à partir d'étiquettes humides détachées - Google Patents

Procédé de production de papier d'étiquettes à partir d'étiquettes humides détachées

Info

Publication number
EP4143380A1
EP4143380A1 EP21723186.9A EP21723186A EP4143380A1 EP 4143380 A1 EP4143380 A1 EP 4143380A1 EP 21723186 A EP21723186 A EP 21723186A EP 4143380 A1 EP4143380 A1 EP 4143380A1
Authority
EP
European Patent Office
Prior art keywords
waste paper
suspension
paper stock
fraction
din
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.)
Withdrawn
Application number
EP21723186.9A
Other languages
German (de)
English (en)
Inventor
Michael Moser
Stefan EITZE
Marta BAGINSKI
Enrico KARALLUS
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.)
Kuebler & Niethammer Papierfabrik Kriebstein Ag
Original Assignee
Kuebler & Niethammer Papierfabrik Kriebstein Ag
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 Kuebler & Niethammer Papierfabrik Kriebstein Ag filed Critical Kuebler & Niethammer Papierfabrik Kriebstein Ag
Priority to DE21723186.9T priority Critical patent/DE21723186T1/de
Publication of EP4143380A1 publication Critical patent/EP4143380A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • 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
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • D21C5/025—De-inking
    • 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 invention relates to a method for waste paper processing comprising at least one first flotation step for removing printing inks from a waste paper stock suspension.
  • these papers In addition to high wet and alkali resistance for the washing process of a bottle in a hot alkaline alkali bath, these papers also need a high wet opacity in order to prevent the glue trace from the gluing, among other things, from being seen and no disturbance of the printed image when the labels get wet he follows.
  • titanium dioxide or other highly scattering pigments are usually used in the mass and in the surface coating.
  • These label papers are used today in all bottling plants, for example for mineral water, fruit juices, beer, wine, etc. all over the world.
  • the invention has set itself the task of developing a process for the production of wet- and alkali-resistant label papers, preferably in the basis weight range of 50-100 g / m 2 from types of waste paper according to DIN EN 643. Ideally, the proportion of waste paper should be up to 100%.
  • the at least first flotation step precedes, by adding an acidifying agent, the pH value of the waste paper stock suspension to a value between 8.0 and 9.3, preferably between 8.2 and 9.0 and especially is preferably set between 8.3 and 8.8 and most preferably between 8.4 and 8.6.
  • Acids for example hydrochloric acid, or salts which, when dissolved in water, produce a pH value of this solution below 7.0, are suitable as acidifying agents.
  • Hydrochloric acid for example, reacts with the sodium hydroxide solution and produces table salt. This reduces the proportion of sodium hydroxide solution and thus also lowers the pH value.
  • the invention has made use of the knowledge that when using alkaline-preloaded waste paper of grade group 5.05.00, the pH value in the pulper increases to up to 11.5 depending on the amount added to the extracted labels or their pH value, while without Additions of fibers from label paper, a pH value of 9.3 - 9.5 prevails. It has been shown that the increased pH value leads to problems in a first flotation, in particular due to foam formation. This significantly worsens the dewaterability of the pulp on a disc filter downstream of the first flotation. Overall, this reduces the system performance and also worsens the quality of the material.
  • the acidifying agent is aluminum sulfate.
  • the aluminum sulfate has the additional advantage that the aluminum ions act as a flocculant on the disc filter as a flocculant and thus as a dewatering accelerator, which relieves the disc filter during operation.
  • the waste paper stock suspension is reduced to a stock consistency between 0.5% and 1.5%, preferably 0.8% and 1.2%, before the first flotation step, and particularly preferably adjusted to 1%.
  • the dilution is preferably carried out with water. This dilution optimizes the flotation.
  • the aluminum sulfate is added to the waste paper stock suspension in aqueous solution.
  • the aqueous solution of aluminum sulfate is preferably added to the dilution water, or the aqueous solution is the dilution water, so that the concentration of the aluminum sulfate added is as low as possible. Since calcium carbonate is regularly contained in waste paper, due to the low pH value of a concentrated aluminum sulfate solution with a pH value of 2.5 without dilution, the calcium carbonate-containing substance would break down the calcium carbonate through local acidification and thus lead to the formation of gypsum and CC> 2 come. By adding the amount of aluminum sulfate, the pH value can now be adjusted to the optimum of 8.5 - 8.6.
  • the waste paper stock suspension contains between 1% and 100% waste paper of type 5.05.00 according to DIN EN 643.
  • This type of waste paper is referred to as "wet labels" in DIN EN 643 and is described as used, moist labels made of wet-strength paper, a maximum of 1% glass content permitted and a maximum of 50% moisture content, without other prohibited substances.
  • the claimed process allows 100% reusability of wet labels.
  • waste paper stock suspension contains less than 100% waste paper of type 5.05.00 according to DIN EN 643
  • the remaining portion of waste paper can contain waste paper of type 1.11 according to DIN EN 643.
  • the waste paper type 1.11 according to DIN EN 643 is called “deinked” and describes as sorted graphic paper, containing at least 80% newspapers and magazines. It must contain at least 30% newspapers and at least 40% magazines. Print products that are unsuitable for deinking , are limited to 1.5%.
  • This type of paper can be used in the new process without changing the chemical composition of the pulp mixture. Since the wet labels already contain caustic residues, no additional caustic solution, or at least only a reduced addition of caustic solution, may be required.
  • there are other types of paper that can easily be added to the waste paper stock suspension For example type 1.09.00 "Newspapers and magazines", which mainly contain unsold copies and therefore less problems are to be expected than deinked goods Sustainability makes the biggest contribution.
  • the waste paper suspension contains up to 0.75% by weight of 49.5% hydrogen peroxide.
  • FIG. 1 shows the sequence of process steps in a graphical form.
  • the production of wet and alkali-resistant label papers is based on the inventive waste paper processing.
  • the recycling of waste paper is divided into different process steps and shown in FIG. 1. Roughly, a distinction can be made between the Storage of waste paper 1, the storage of chemicals 2 that are required for waste paper processing, the shredding 3 of the waste paper, a medium-consistency sorting 4, a first flotation 5, a cleaning 6, a low-consistency sorting 7, a first thickening 8, a dispersion 9, a Oxidative bleach 10, a second flotation 11, a second thickening 12, a reductive bleach 13, in which a reductive bleach is fed to the process from a batch & metering system 15, a stacking 14, before the processed waste paper stock is fed to a paper machine 16.
  • the person skilled in the art recognizes that some process steps may be carried out in a different order, or some process steps can be omitted or other process steps can be added without deviating from the concept of the invention.
  • waste papers of the grades group 1, 2, 3 and 5 according to DIN EN 643 are used, in particular the grades group 1: 1.06.00 / 1.06.01 / 1.06.02 / 1.07.00 / 1.09.00 / 1.11.00
  • the waste paper is stored either loosely or in bales in the waste paper store.
  • the waste paper of type groups 5.05.00 (washed off wet labels) is obtained with a dry content of approx. 40% - 50% after being washed off the bottle with approx. 1.8% caustic soda at the beverage manufacturers. Accordingly, this waste paper has a high level of alkalinity. Investigations into the dissolvability have shown that these papers require a minimum storage period in an alkaline medium, otherwise these papers cannot be suspended. The minimum storage period is ideally determined for each batch using a suitable laboratory test procedure with a specially built laboratory pulper with a special spiral opening (based on a HC pulper). Typically, the dissolution conditions in the laboratory pulper are as follows:
  • washed-off labels can be dissolved under these parameters, then the minimum storage period has been reached and the labels can be used. If the dissolvability is not yet given, the batch must be stored longer and the test for the dissolvability repeated at a later point in time.
  • the sodium hydroxide solution breaks up the fiber structure and detaches the printing inks adhering to the surfaces of the fibers.
  • the result is a homogeneous, gray starting fiber material.
  • the following pulping conditions are required in the pulper:
  • the recipe for the pulper is as follows: H 2 0 2 (49.5%) 0.75%
  • the recipe is the same as for other types of waste paper, with the exception of the addition of caustic soda.
  • the addition of caustic soda can either be omitted entirely or at least reduced in the case of a mixture of detached wet labels and other types of waste paper.
  • the pH value is measured using a pH value measuring device.
  • the pulper emptying process begins.
  • the content of the pulper is pumped into a downstream emptying vat.
  • the dilution water lowers the pH value to a range of 8.7-9.0.
  • the suspension When pumping out into the emptying chute, the suspension must pass a first sorting unit of a sorting pear with a perforated plate, for example a 6 mm hole diameter. Coarse impurities such as foils, plastic, metal, etc. are deposited in the sorting pear. held back and collected. After the emptying process is complete, these are discharged and collected in a container.
  • the dwell process takes place at approx. 5% consistency to swell the suspension pumped out of the pulper.
  • the time factor plays the dominant role here. Chemicals in the suspension ensure that water penetrates well Fibers. These swell up, enlarge their surface and become supple. Any printing inks that are still adhering are blown off by the surface tension and are deposited in later process steps.
  • the coarsest impurities contained in the suspension such as stones, broken glass, staples, etc. must be deposited.
  • Two thick solids cleaners connected in parallel are used for this purpose. These work on the principle of centrifugal separation.
  • the suspension is accelerated in vertical steel cylinders with a conical end piece, specifically heavier parts than the fibers themselves are pressed to the edge and deposited at the end of the cone.
  • a cyclically clocking heavy dirt sluice serves as a collector.
  • the thick matter cleaning is integrated in the hole sorting process step.
  • the hole sorting system consisting of three sorters is integrated between two start / stop vats.
  • the suspension is conveyed to the first sorter via the aforementioned high-viscosity cleaning system.
  • a cylindrical upright screen basket with holes of preferably a diameter of 1.2 mm is installed in the sorter.
  • the accepted material leaving the sorter has passed the 1.2 mm holes and is collected in a downstream vat.
  • the reject is removed in the lower part of the sorter and fed to the second sorter after being diluted with circulating water.
  • the accepted material is also collected in the downstream vat.
  • the reject is again diluted and fed to the third sorter. Its accept also reaches the downstream chute.
  • the reject is separated and discharged from the system.
  • the hole sorting is used to separate flat impurities in the suspension.
  • the structure is similar to the hole sorting system, but the sorters have sieve baskets with slots with a slot width of preferably 0.2 mm.
  • the first stage consists of two sorters of the same size and type connected in parallel.
  • the reject produced in each case is re-sorted in the downstream stage.
  • the last (third) stage in each case removes the resulting reject from the system.
  • the accepts from all three stages are collected in a downstream vat.
  • the slot sorting serves to separate three-dimensional (cubic) impurities.
  • the stock consistency after slot sorting is approx. 2%
  • the flotation process step forms the core of every deinking system.
  • mechanical impurities of different sizes and geometries were successively removed.
  • the detached printing inks are removed from the suspension in flotation cells.
  • the pulp is diluted to a consistency of approx. 1% using circulating water and the pH value is thereby adjusted to the level of 8.5 - 8.6 required for flotation.
  • dilution water alone is not sufficient for such a reduction in the case of peeled wet labels. Therefore, aluminum sulfate Al ⁇ SC b is added to the dilution water in a form dissolved in water, whereby the aluminum sulfate solution is already further diluted before the dilution water runs into the vat.
  • the pH value of the waste paper stock suspension in the vat is continuously monitored by a pH value measuring device and the aluminum sulfate solution is added to the dilution water as long as the pH value is above 9.0.
  • a series of several flotation cells is called a flotation line.
  • the suspension is pumped successively from cell to cell by pumps. When entering each of these cells, it is heavily mixed with air through special ventilation elements (diffusers).
  • a foam layer is created on the surface of which the printing inks detached in the pulper attach to the bubbles. A weir ensures an adjustable overflow of the foam.
  • the so-called "primary flotation” foams are collected and subsequently floated in the "secondary flotation". Only the foam from the secondary cell, together with the foam from the 1st primary flotation cell, is discarded and fed to a sludge vat.
  • the smallest impurities still contained in the suspension, which are specifically heavier than the fiber material, are removed in a 4-stage cleaner system.
  • the technical structure is similar to that of the thick material cleaners, only the diameter of the vertical ones Cylinder with a conical tip is noticeably smaller.
  • the principle of operation is also the same. After the resulting reject is "post-cleaned” under strong dilution in the next stage, the fourth stage discharges the concentrated reject. This is discarded.
  • the fiber suspension is subjected to a three-stage re-sorting.
  • the structure is similar to the slot sorting explained in.
  • the sorters have slot baskets with a slot width of preferably 0.15 mm.
  • the accepts in stages 1 and 2 are forwarded, and their rejects are re-sorted in the respective subsequent stage.
  • the concentrated reject of the S stage is discarded and fed to a sludge vat.
  • the fiber suspension After the fiber suspension has passed through various sorting and cleaning stages, it is thickened in two stages. This consists of a combination of a disc filter and a twin-wire press.
  • An installed screw pump conveys the pre-thickened stock from the disc filter to the twin-wire press (DSP), where it is thickened to a stock consistency of up to 35%.
  • the filtrate water squeezed out on the DSP is returned to the pulper filling water chamber and is used to make new pulper.
  • the finished material to be produced has to meet the highest requirements in terms of visual cleanliness, every dirt particle in the paper that can be seen with the naked eye would cloud the visual impression. These can be residual fragments of printing inks or tiny dirt particles that have not yet been completely detached from the fibers.
  • the pulp is therefore heated with a direct supply of steam and then fed to a disperser. Shear forces generated by high specific energy input within the machine, the dirt particles are crushed below the visibility limit of the human eye.
  • the disperger is used as a "mixing machine" for the chemicals in the subsequent oxidative bleaching stage. To increase the whiteness, bleaching of the fiber is essential.
  • the bleaching process is carried out in a bleaching tower with the addition of hydrogen peroxide as the bleaching component and the addition of caustic soda and water glass as activating or stabilizing components.
  • the fiber material rests in this at a high temperature and for a defined period of time.
  • new pulp coming from the disperger is continuously fed in via a screw conveyor system.
  • it is continuously diluted with circulating water and the bleached pulp is fed to the next process step.
  • the method of operation is the same in all respects as the flotation described above.
  • the difference lies in the separation task. If the largest amounts of printing inks detached in the pulper are separated in the flotation 1, the dirt specks, residual printing inks and mineral additions such as ash are separated in this flotation stage. To minimize losses, there is also a subdivision into primary and secondary flotation.
  • the overflow discharged from the secondary cell like the overflow from the secondary cell from flotation 1, is fed to the sludge vat. From this the sludge is pumped out for further thickening.
  • the pulp which has been partially dehydrated by the disc filter, is fed via a steam-heated storage vessel to a pulp pump equipped with a ventilation device.
  • a bleach solution is metered into the air evacuated pulp in the suction nozzle.
  • the pulp pump conveys the pulp from below into a vertical bleaching pipe, in which a reductive post-bleaching takes place.
  • a reductive post-bleaching takes place.
  • the pulp pump conveys the pulp from below into a vertical bleaching pipe, in which a reductive post-bleaching takes place.
  • a reductive post-bleaching takes place.
  • It will be pale Fiber material is not lightened or bleached, but rather a "color location correction" takes place. This correction is perceived by the human eye as a gain in whiteness.
  • a dissolving and dosing station is available to produce the bleach solution.
  • sodium hydrosulphite powder is continuously dissolved in fresh water.
  • This solution is metered in front of the stock pump to the bleaching tube via a metering pump integrated in the system.
  • the pulp transferred from the bleaching tube into the storage tower represents the "finished product" of the deinking system at this point.
  • the storage tower has, for example, around 300 m 3 of usable volume and can therefore hold up to 301 pulp. This stack volume serves as a buffer between the deinking system and the paper machine.
  • a stock pump installed on the storage tower is used to pump the pulp into a smaller equalizing tank, diluting it with water from the paper machine.
  • This container which is equipped with a stirrer, compensates for fluctuations in stock density, which inevitably arise when discharging from the storage tower.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne un procédé de traitement de vieux papiers, comprenant au moins une première étape de flottaison pour éliminer des encres d'impression d'une suspension de vieux papiers. Une fois détachées, des étiquettes humides imprégnées de lessive sont utilisées. Selon l'invention, la valeur de pH de la suspension de vieux papiers est ajustée pour atteindre une valeur comprise de préférence entre 8,4 et 8,6 en ajoutant un agent acidifiant dans une étape du procédé précédant la première ou les premières étapes de flottaison. Ceci empêche la formation de mousse dans la première ou les premières étapes de flottaison.
EP21723186.9A 2020-04-29 2021-04-29 Procédé de production de papier d'étiquettes à partir d'étiquettes humides détachées Withdrawn EP4143380A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE21723186.9T DE21723186T1 (de) 2020-04-29 2021-04-29 Verfahren zur herstellung eines etikettenpapiers aus abgelösten nassetiketten

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020111675.6A DE102020111675A1 (de) 2020-04-29 2020-04-29 Verfahren zur Herstellung eines Etikettenpapiers aus abgelösten Nassetiketten
PCT/EP2021/061242 WO2021219776A1 (fr) 2020-04-29 2021-04-29 Procédé de production de papier d'étiquettes à partir d'étiquettes humides détachées

Publications (1)

Publication Number Publication Date
EP4143380A1 true EP4143380A1 (fr) 2023-03-08

Family

ID=75787073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21723186.9A Withdrawn EP4143380A1 (fr) 2020-04-29 2021-04-29 Procédé de production de papier d'étiquettes à partir d'étiquettes humides détachées

Country Status (3)

Country Link
EP (1) EP4143380A1 (fr)
DE (2) DE102020111675A1 (fr)
WO (1) WO2021219776A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT527520B1 (de) * 2023-08-31 2025-06-15 Valmet Technologies Oy Prozesswasserentwässerungssystem

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2311674C3 (de) * 1973-03-09 1978-01-19 Degussa Verfahren zum regenerieren von altpapier
DE2947862C2 (de) * 1979-11-28 1982-04-01 J.M. Voith Gmbh, 7920 Heidenheim Verfahren und Anlage zur Herstellung einer Faserstoffsuspension aus Altpapier
DE3309956C1 (de) * 1983-03-19 1984-07-12 Degussa Ag, 6000 Frankfurt Verfahren zum Bleichen von Papierrohstoffen
DE3616816A1 (de) * 1986-05-17 1987-11-19 Degussa Verfahren zum entfaerben von in der masse gefaerbten papieren und selbstdurchschreibepapieren
DE3723502A1 (de) * 1987-07-16 1989-01-26 Henkel Kgaa Verfahren zur flotation von fuellstoffen aus altpapier
DE3831668A1 (de) * 1988-09-17 1990-03-22 Escher Wyss Gmbh Verfahren zur weissgraderhoehung von altpapier mit neutralem wasserkreislauf
CH687209A5 (de) * 1993-12-07 1996-10-15 Utzenstorf Papierfabrik Ag Verfahren zur Aufbereitung von Altpapier fuer die Papierproduktion.
DE10254862A1 (de) * 2002-11-25 2004-06-03 Degussa Ag Verfahren zur Druckfarbenentfärbung aus Altpapier durch Flotationsdeinking
FI20055234L (fi) * 2005-05-18 2006-11-19 Linde Ag Menetelmä kierrätyskuitujen siistaamiseksi ja hapon käyttö siistauksessa
DE102008028003A1 (de) 2008-06-12 2009-12-24 Meri Entsorgungstechnik für die Papierindustrie GmbH Anlage und Verfahren zur Aufbereitung von Prozesswasser mit getrennter Abtrennung von Gasen und Feststoff
CA2825554A1 (fr) 2011-01-25 2012-08-02 Basf Se Procede de preparation de demi-pates pour la production d'articles en papier
DE102011016838A1 (de) 2011-04-12 2012-10-18 Voith Patent Gmbh Verfahren zum Behandeln von Flüssigkeiten und Dispersionen mit elektrolytisch unter Verwendung einer Zweikammer-Elektrolysezelle hergestellten Metallionen

Also Published As

Publication number Publication date
DE102020111675A1 (de) 2021-11-04
DE21723186T1 (de) 2023-05-11
WO2021219776A1 (fr) 2021-11-04

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