EP2238290A2 - Verfahren und vorrichtung zur aufbereitung von altpapier - Google Patents
Verfahren und vorrichtung zur aufbereitung von altpapierInfo
- Publication number
- EP2238290A2 EP2238290A2 EP08851130A EP08851130A EP2238290A2 EP 2238290 A2 EP2238290 A2 EP 2238290A2 EP 08851130 A EP08851130 A EP 08851130A EP 08851130 A EP08851130 A EP 08851130A EP 2238290 A2 EP2238290 A2 EP 2238290A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- stage
- fibers
- thickening
- flotation
- washing
- 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- Withdrawn
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
-
- 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
-
- 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 method and apparatus for processing waste paper.
- Too large particles form, for example, UV-crosslinked colors and vegetable oil-based paints. Too small particles form, for example, toner or flexographic inks and inkjet inks.
- a further process stage is necessary in which the fibers containing these printing inks are dispersed. The color particles are detached from the fibers and crushed at the same time. As a result, they can be separated from the fibers in a subsequent step by a conventional flotation process. This additional process stage is associated with significant fiber loss.
- EP 1 731 662 A1 describes a method for processing waste paper, in which the separated fibers are fractionated after the first flotation step, ie split into a short fiber fraction and a long fiber fraction.
- the short fiber fraction mainly contains short fibers as well as other fillers and fillers.
- the long-fiber fraction contains, in addition to the long fibers, substantially larger impurities such as sticky particles, agglomerates and unsealed, still adhering to the long fibers. ben. Only the long fiber fraction is subjected to dispersion. The two fractions will be reunited in the further course of the procedure. The fiber losses are reduced and energy is saved because the short fiber fraction is not dispersed with it. In addition, the machine size for the dispersion can be reduced.
- the present invention therefore has the aim of developing a generic method or a generic device such that all color particles are reliably removed and the quality of the resulting paper is as constant as possible.
- the solution consists in a method having the features of claim 1 and in a device having the features of claim 12.
- the waste paper is dissolved in fibers, the fibers subjected to a washing process, a dispersion and a flotation and then to Rothver - be prepared processing in a paper machine, wherein the liquid obtained during the washing process, the fibers before the step d) is supplied again.
- washing is defined as a solid-solid separation process in which fine particles are separated from the fibers. Suitable washing steps for this purpose are known as such.
- a suitable, known embodiment of such a washing stage has, for example, a central roll with a peripheral sieve.
- the fiber stream is passed in a substance distributor and injected through a nozzle into the space between the rotating central roller and the rotating sieve.
- the fiber stream is thickened by the screen tension, and the resulting filtrate containing the fine particles is thrown off due to the centrifugal force and discharged to the outside.
- the washed and thickened fibers are removed from the central roll and processed further.
- the fibers obtained in the course of the process are particularly well-suited for the production of high-quality papers because whiteness and cleanliness are considerably improved.
- the filtrate obtained in the wash contains, in addition to already detached inks also for paper quality important fines and short fibers. Therefore, it is provided according to the invention to recycle this filtrate before the flotation in the fiber stream. In this way, both the long fibers and the short fibers are guided in a single fiber stream through the dispersing stage, where the remaining inks are peeled off from the fibers.
- the ink particles accumulated in the filtrate of the washing stage after washing are passed around the dispersing stage together with the important fines and short fibers and fed to the flotation stage. This ensures that all printing inks are removed during flotation while minimizing the loss of short fibers and fines. In this way, a significantly improved paper quality is achieved and at the same time significantly reduces the mechanical complexity for waste paper processing.
- a further advantage of the method according to the invention is that only one flotation stage is required, which is laid backwards, ie downstream, in the process sequence compared to the prior art. Therefore, those from the state of the art Previously necessary second flotation resulting material losses no longer occur in the process of the invention.
- Another important aspect of the present invention is that there is no need for fractionation of the fibers into a short-fiber fraction and a long-fiber fraction that was hitherto regarded as essential in the prior art.
- the passage of the combined short and long fibers through a single washing stage, a single dispersing stage and a single flotation device with simultaneous diversion of the filtrate obtained in the washing stage around the dispersing stage is associated with only a slight loss of fiber.
- Almost all of the amount of fiber obtained in the dissolution of the waste paper and a substantial proportion of the fines essential to paper quality ultimately reach the paper machine for making new paper. This achieves a considerable improvement in the quality of the resulting paper.
- the method according to the invention is considerably simplified in comparison to the prior art, so that the device according to the invention which is suitable for carrying out the method is constructed substantially less complexly than the devices known in the prior art. This goes hand in hand with a considerable cost savings.
- further thickening for example high-consistency thickening, may be carried out in order to further reduce the amount of fiber flow conducted through the dispersing stage. This is particularly useful if you want to set an optimum for the dispersion consistency, so that the best possible shear can be achieved.
- the resulting in the thickening liquid can either be disposed of or recycled as well as the filtrate obtained in the washing stage before the flotation in the fiber stream and further processed.
- the fibers obtained during the dissolution of the waste paper can be subjected to at least one customary sorting, for example a coarse sorting and a fine sorting, before the washing, in order to remove any impurities which may still be present.
- a conceivable treatment of the fibers for further processing in a paper machine can, for example, consist of at least one thickening step in order to reduce the volume of the fiber stream.
- a further advantageous embodiment of the method according to the invention consists of subjecting the filtrate obtained in the washing stage to a separate thickening and of using the water obtained in this separate thickening to optimally adjust the consistency of the fiber stream upstream of the washing stage in order to further increase the fiber quality improve.
- the material resulting from the separate thickening is then returned to the fiber stream before the flotation stage.
- the fiber material obtained after the dispersion can serve as a filter aid for the separate thickening.
- the water is suitable that if necessary provided additional thickening levels before the actual paper production.
- Figure 1 is a block diagram of a first embodiment of an inventive
- FIG. 1 is a block diagram of another embodiment of an inventive
- the block diagrams show a total of two embodiments of the method according to the invention.
- the machines and other devices used for this purpose are known to the person skilled in the art, so that their detailed description is dispensed with.
- FIG. 1 shows a first embodiment of the method according to the invention.
- the waste paper is fiberized in a dissolution step 10 in a manner known per se, i. dissolved in fibers.
- the resulting fibers are present in a pulp mixture containing short fibers and long fibers, the short fibers are already freed from the printing inks, while on the long fibers not detached from printing inks can adhere.
- the pulp mixture therefore contains detached color particles and, moreover, other fillers and fillers as well as relatively large impurities such as adhesive particles ("stickies") and non-paper constituents
- the pulp mixture is therefore used in a conventional manner in a first sorting stage 11 of coarse sorting in the exemplary embodiment and, if necessary, subjected to a fine sorting in a second sorting stage 16 to separate impurities such as sticking particles or foreign matter from the fibers, and then the entire fiber stream containing short fibers and long fibers is fed to a washing stage 17 where it undergoes washing.
- fine solid particles such as fillers and already detached printing inks, but in some cases also fines and a part of the short fibers, are separated from the fiber stream, the long fibers and part of the short fibers remaining behind in the fiber stream.
- the fiber stream After washing, it is useful to subject the fiber stream in a thickening stage 19, for example, a high-consistency thickening to bring it to a suitable consistency for the dispersion. Then, the fiber stream is dispersed in a dispersion stage 21 in a conventional manner. In the process, the printing inks which are still adhering to the fibers, in particular the long fibers, are detached in the form of small color particles. The color particles are now accessible to a flotation process, with which they can be separated from the fibers. At the same time as the dispersion, the fibers can, for example, be bleached oxidatively.
- the fiber stream is subjected to a flotation process in a flotation device 23 in a manner known per se.
- the filtrate obtained in the wash in the washing stage 17 is removed via a line 27 from the washing stage 17 and recycled before the flotation stage 23 into the fiber stream.
- the already detached printing inks contained in the filtrate are in this way passed around the dispersing stage 21 together with the valuable fines.
- a dispersion of the filtrate is not required and also undesirable because the inks contained in the filtrate are already in dispersed form and no longer adhere to the fibers. In this way, the qualitative result of the dispersion of the remaining fiber stream in the dispersing stage 21 is improved.
- the dispersing stage 21 can be designed for a lower fiber flow volume than hitherto necessary in the prior art.
- all hydrophobic solids whose particle size is approximately between 5 .mu.m and 500 .mu.m in diameter are separated from the fibers in a manner known per se. These include, in particular, all printing inks which are dispersed in the fiber stream after the dispersion stage 21 or are fed back via the lines 27, 28 to the fiber stream upstream of the flotation stage 23.
- the fiber stream thus cleaned can be thickened in a thickening device 24, for example a disk filter, and if appropriate subsequently the fibers are bleached.
- a thickening device 24 for example a disk filter
- the fibers are bleached.
- This is followed in the exemplary embodiment by a high-consistency thickening in a further thickening stage 25.
- the resulting nonwoven fabric can now be fed to a paper machine.
- this paper machine can be a sheet forming unit which can produce single-layer or multi-layered paper products, for example two-ply corrugated board or four-ply board.
- the fiber stream prior to the washing stage 17 may be in a particularly thin consistency, with the result that the resulting filtrate is less viscous than desired and can not be completely recycled to the fiber stream prior to the flotation stage 23 for quality considerations. If such an excess of water is present, it may be useful to modify the method according to the invention, as shown by way of example in FIG. 1, such that an embodiment of the method according to the invention results, as illustrated by way of example in FIG.
- FIG. 2 shows a second embodiment of the method according to the invention, which corresponds in its essential steps of the embodiment of Figure 1.
- the identical with the embodiment shown in Figure 1 process stages are therefore provided with the same reference numerals.
- the waste paper is also passed through a dissolution stage 10, a first sorting stage 11 and possibly a second sorting stage 16.
- the resulting fiber stream is processed in the same manner as described with reference to FIG.
- the fiber stream is thus fed to a washing stage 17, where it is subjected to a wash.
- the fiber stream is subjected to a thickening step 19 of a high-consistency thickening and then dispersed in a dispersing step 21 in a conventional manner.
- the fibers can, for example, be bleached oxidatively.
- the fiber stream is then subjected to a flotation process in a flotation device 23 in a manner known per se.
- the cleaned fiber stream is thickened in a thickening device 24, for example a disk filter. This is followed by a high consistency thickening in a further thickening stage 25.
- the resulting nonwoven fabric can now be fed to a paper machine.
- the modification of the method according to the invention consists in the fact that the consistency of the fiber stream, ie the degree of its dilution, can be optimized in each phase of the method according to the invention.
- the starting point of the modification is the consideration that, for reasons of quality, the fiber stream before the washing stage 17 can be present in a highly diluted form.
- the resulting from the washing stage 17 filtrate thus falls in a relatively large amount. Nevertheless, the important short fibers and fines contained in this filtrate, as described above, should not be lost. Therefore, the withdrawn by means of a line 18 from the washing stage 17 filtrate is subjected to a separate thickening in a separate thickening stage 31.
- the thickened filtrate analogous to the embodiment of the process according to the invention described in FIG. 1, is recycled before the flotation stage 23 into the fiber stream.
- the thickened filtrate contains the important short fibers and fines as well as analogously to the described in Figure 1 embodiment of the method according to the invention, already incurred in the defibration and sorting detached printing inks, which are finally removed in the flotation stage 23.
- the accumulating in the thickening stage 31 water can now be used to optimally adjust the consistency of the fiber stream before the sorting stages 10 and / or 1 1 and or before the washing stage 17, to ultimately achieve a particularly good fiber quality.
- the thickening devices known in the art operate with a filter aid.
- a further modification of the method according to the invention provides that for this purpose the fiber stream resulting from the dispersion stage 21 is used which has a suitable consistency.
- the fiber stream is partially or completely withdrawn after the dispersing and fed via a line 32 of the thickening stage 31, where the ⁇ m fiber stream contained short and long fibers as filter aid, eg. Serve as a support fiber in a known per se vacuum disc filter.
- filter aid eg. Serve as a support fiber in a known per se vacuum disc filter.
- the person skilled in the art is free to use a separate filter aid instead.
- the fiber stream When the fiber stream is used as a filter aid, all fibers and other solids such as fines, fillers and dispersed inks obtained in the thickening stage 31 are returned to the fiber stream and subjected to flotation in the flotation stage 23.
- the fiber stream before the flotation step 23 may need to be diluted again become.
- a further modification of the method according to the invention provides that for this purpose the water obtained in the thickening stages 24 and / or 25 is used and returned via a line 33 in front of the flotation stage 23 into the fiber stream.
- a second - smaller - water cycle leads from the last thickening stages 24 and / or 25 before the flotation stage 23 and back.
- the water contained in it is always cleaner than the water contained in the first - larger - water cycle.
- This first water cycle leads from the washing stage 17 or thickening stage 19 via the thickening stage 31 to positions upstream of the washing stage 17, for example before the sorting stages 10 and / or 11 and / or before the washing stage 17. In this way the water load is increased reduced the inventive method.
- the consistency of the fiber stream can be optimally adjusted.
- the present in the second, smaller circuit comparatively clean water in the first, larger circuit can be introduced, the polluted water is fed to a sewage treatment plant.
- the water removed from the second, smaller circuit in this way can be replaced by clean fresh water (not shown).
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710055557 DE102007055557A1 (de) | 2007-11-20 | 2007-11-20 | Verfahren und Vorrichtung zum Aufbereiten von Altpapier |
PCT/EP2008/009447 WO2009065506A2 (de) | 2007-11-20 | 2008-11-08 | Verfahren und vorrichtung zur aufbereitung von altpapier |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2238290A2 true EP2238290A2 (de) | 2010-10-13 |
Family
ID=40576857
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08851130A Withdrawn EP2238290A2 (de) | 2007-11-20 | 2008-11-08 | Verfahren und vorrichtung zur aufbereitung von altpapier |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110162810A1 (de) |
EP (1) | EP2238290A2 (de) |
DE (1) | DE102007055557A1 (de) |
WO (1) | WO2009065506A2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013018678A1 (ja) * | 2011-07-29 | 2013-02-07 | 東レ株式会社 | ろ過助剤の製造方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2908660C2 (de) * | 1979-03-06 | 1984-02-09 | J.M. Voith Gmbh, 7920 Heidenheim | Verfahren und Anlage zur Rückgewinnung einer Faserstoffsuspension aus gemischtem Altpapier |
DE4134607A1 (de) * | 1991-10-19 | 1993-04-22 | Escher Wyss Gmbh | Verfahren zur entfernung von feinen verunreinigungen aus altpapierfaserstoff |
EP0653510A3 (de) * | 1993-11-11 | 1996-02-21 | Voith Gmbh J M | Verfahren zur Aufbereitung von bedrucktem Altpapier. |
AT501932B1 (de) | 2005-06-06 | 2007-04-15 | Andritz Ag Maschf | Verfahren zum wiederaufbereiten von altpapier |
-
2007
- 2007-11-20 DE DE200710055557 patent/DE102007055557A1/de not_active Withdrawn
-
2008
- 2008-11-08 EP EP08851130A patent/EP2238290A2/de not_active Withdrawn
- 2008-11-08 US US12/734,742 patent/US20110162810A1/en not_active Abandoned
- 2008-11-08 WO PCT/EP2008/009447 patent/WO2009065506A2/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009065506A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009065506A2 (de) | 2009-05-28 |
US20110162810A1 (en) | 2011-07-07 |
DE102007055557A1 (de) | 2009-05-28 |
WO2009065506A3 (de) | 2009-07-09 |
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