WO2020038823A1 - Faserstoffaufbereitung - Google Patents
Faserstoffaufbereitung Download PDFInfo
- Publication number
- WO2020038823A1 WO2020038823A1 PCT/EP2019/071920 EP2019071920W WO2020038823A1 WO 2020038823 A1 WO2020038823 A1 WO 2020038823A1 EP 2019071920 W EP2019071920 W EP 2019071920W WO 2020038823 A1 WO2020038823 A1 WO 2020038823A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pulp
- stage
- paper web
- fibers
- short
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D99/00—Subject matter not provided for in other groups of this subclass
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
Definitions
- the invention relates to a process for the formation and treatment of a pulp suspension from pulp and water suitable for the production of paper webs, the pulp suspension being fed from a pulp chest over several treatment stages to a plurality of storage stores.
- the pulp suspension is mainly fed directly from an adjacent pulp mill into the pulp tub. If necessary, however, the pulp can only be dissolved in the chest. This is followed by several process steps for treating the fiber suspension until the fiber suspension fulfills the required parameters and can be transferred to a machine for producing a fiber web.
- kraft pulp sulfate pulp
- cover paper for corrugated cardboard cover paper for corrugated cardboard
- the object of the invention is therefore to enable a high strength of the paper web at the lowest possible cost.
- the invention enables the cost-effective use of hardwood-based, unbleached short fiber pulp.
- the strength disadvantage can be compensated by an optimal combination of the process steps.
- the focus in the specific energy input to increase strength is particularly on the long fiber fraction. Furthermore, a method is used with the dispersion which, with a comparable increase in strength, causes a significantly lower increase in the degree of grinding, which is the sheet formation process is advantageous because of the lower drainage effort.
- fibrous material is only processed as far as is suitable for the largest possible application of starch.
- the figure shows a system diagram for the pulp processing of pulp, which consists of more than 95% (preferably entirely) of unbleached hardwood short fiber pulp (floch yield hardwood sulfate pulp), in particular unbleached eucalyptus short fiber pulp and at most 5% of recycled fibers.
- At least one paper web layer with in particular mechanical properties similar to the previously known kraft liner i.e. a cover layer for corrugated or solid cardboard.
- this kraft liner should have the required, relatively high strength properties.
- the pulp digested with the sulfate process should have a kappa between 75 and 100 and a length-weighted fiber length (according to the Kajaani method) between 0.6 and 0.9 mm.
- the pulp suspension 1 arrives directly from a pulp factory into a pulp chest 2. From the pulp chest 2, the pulp suspension 1 is then led to a cleaning stage 5 for cleaning, which is formed by several flydrocyclones.
- the fiber suspension 1 is divided in a subsequent fraction ier stage 6 into a short fiber fraction 7 with a high proportion of short fibers and a long fiber fraction 8 with a high proportion of long fibers.
- the fraction ier stage 6 is formed here in two stages by two slot sorters, which have a sieve element with sieve openings in the form of slots with a slot width of at most 0.25 mm, in particular a maximum of 0, that is rotationally symmetrical around a sieve axis , 15 mm.
- the short fiber fraction 7 thus produced is of good quality and provides an ideal surface for printing.
- the long fibers collected in the long fiber fraction 8 can subsequently be treated specifically with a view to increasing the strength.
- the splinters that are also contained are simultaneously defibrated.
- fractionation stage 6 is set such that between 50 and 80% of the fiber suspension 1 are transferred to the short fiber fraction 7.
- both fractions 7,8 are passed through two dewatering stages 9, 10, 1, 12.
- the first dewatering stage 9, 10 is formed by a disc filter, which can increase the consistency up to 15%.
- a common disc filter can also be used, which has separate chambers for the thickening of both fractions 7,8, but the filtrate is preferably discharged together.
- the second dewatering stage 11, 12 of the fractions 7,8 each consists of a screw press, which can increase the consistency to over 30%.
- the clear filtrate of the dewatering stages 9, 10, 1, 12 can often be reused in the fiber preparation without separation of the fines.
- At least one, preferably both fractions 7, 8 should pass through before and / or after the respective storage store 3, 4 at least one treatment step which increases the strength of the fibers is carried out.
- At least the long fiber fraction 8 is treated in a dispersion stage 14, but if possible also the short fiber fraction 7 in a separate dispersion stage 13.
- the strength is increased via the dispersion without a large increase in the freeness.
- components of the FIC grinding can also be used.
- the screw press of this fraction 7 can also be omitted.
- the dispersion forms the foundation of the increase in strength and should, if possible, take place at a constant specific output between 50 and 150, preferably between 100 and 150 kWh / t.
- Fractions 7,8 are stored for several hours at a consistency of approx. 12% and are used for latency treatment (fiber relaxation).
- Both fractions 7, 8 are passed from the storage 3.4 to a separate grinding stage 15, 16.
- LC grinding takes place in these with a low, constant output of between 30 and 80 kWh / t per grinding stage 15, 16 and a low intensity of maximum 0.7 J / m.
- the goal is to increase the strength while increasing the degree of grinding as little as possible.
- a further fraction 20 in the form of a long fiber fraction from softwood can be provided in a separate storage container 19. After a Treatment in a separate grinding stage 21 can be fed to the mixing tubs 17, 18 in a controlled manner to increase the strength.
- the fibers of the pulp should have a high tear strength of up to 8 km, in particular between 6 and 8 km tear length in the mixing tubs 17, 18.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19755598.0A EP3841247A1 (de) | 2018-08-20 | 2019-08-15 | Faserstoffaufbereitung |
CN201980054601.1A CN112601857A (zh) | 2018-08-20 | 2019-08-15 | 纤维制备 |
BR112021002643-6A BR112021002643A2 (pt) | 2018-08-20 | 2019-08-15 | preparação de material fibroso |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018120175.3 | 2018-08-20 | ||
DE102018120175.3A DE102018120175A1 (de) | 2018-08-20 | 2018-08-20 | Faserstoffaufbereitung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020038823A1 true WO2020038823A1 (de) | 2020-02-27 |
Family
ID=67660557
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2019/071920 WO2020038823A1 (de) | 2018-08-20 | 2019-08-15 | Faserstoffaufbereitung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3841247A1 (de) |
CN (1) | CN112601857A (de) |
BR (1) | BR112021002643A2 (de) |
DE (1) | DE102018120175A1 (de) |
WO (1) | WO2020038823A1 (de) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2908660A1 (de) * | 1979-03-06 | 1980-09-11 | Voith Gmbh J M | Verfahren und anlage zur rueckgewinnung einer faserstoffsuspension aus gemischtem altpapier |
WO2009077001A1 (en) * | 2007-12-17 | 2009-06-25 | Sca Hygiene Products Gmbh | Method for pulp preparation and pulp treatment and a paper, especially a tissue paper |
WO2014131592A1 (de) * | 2013-03-01 | 2014-09-04 | Voith Patent Gmbh | Verfahren zur bildung und behandlung einer faserstoffsuspension |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6340407B1 (en) * | 1999-12-22 | 2002-01-22 | Sun Ho Chung | Process of making recycled linerboard or Kraft paper from old corrugated container |
DE102007017987A1 (de) * | 2007-04-14 | 2008-10-16 | Ptc Paper Technology Consulting Gmbh | Verfahren und Vorrichtung zum Aufbereiten von Altpapier |
WO2014135335A1 (de) * | 2013-03-07 | 2014-09-12 | Voith Patent Gmbh | Faserstoffaufbereitung |
DE102015201996A1 (de) * | 2015-02-05 | 2016-08-11 | Voith Patent Gmbh | Faserstoffbehandlung |
-
2018
- 2018-08-20 DE DE102018120175.3A patent/DE102018120175A1/de not_active Withdrawn
-
2019
- 2019-08-15 WO PCT/EP2019/071920 patent/WO2020038823A1/de unknown
- 2019-08-15 BR BR112021002643-6A patent/BR112021002643A2/pt not_active Application Discontinuation
- 2019-08-15 EP EP19755598.0A patent/EP3841247A1/de not_active Withdrawn
- 2019-08-15 CN CN201980054601.1A patent/CN112601857A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2908660A1 (de) * | 1979-03-06 | 1980-09-11 | Voith Gmbh J M | Verfahren und anlage zur rueckgewinnung einer faserstoffsuspension aus gemischtem altpapier |
WO2009077001A1 (en) * | 2007-12-17 | 2009-06-25 | Sca Hygiene Products Gmbh | Method for pulp preparation and pulp treatment and a paper, especially a tissue paper |
WO2014131592A1 (de) * | 2013-03-01 | 2014-09-04 | Voith Patent Gmbh | Verfahren zur bildung und behandlung einer faserstoffsuspension |
Also Published As
Publication number | Publication date |
---|---|
DE102018120175A1 (de) | 2020-02-20 |
EP3841247A1 (de) | 2021-06-30 |
BR112021002643A2 (pt) | 2021-05-04 |
CN112601857A (zh) | 2021-04-02 |
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