US20140352902A1 - Method for preparing waste paper - Google Patents

Method for preparing waste paper Download PDF

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Publication number
US20140352902A1
US20140352902A1 US14/363,891 US201214363891A US2014352902A1 US 20140352902 A1 US20140352902 A1 US 20140352902A1 US 201214363891 A US201214363891 A US 201214363891A US 2014352902 A1 US2014352902 A1 US 2014352902A1
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US
United States
Prior art keywords
fibre
containing material
pulping
fibres
paper
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.)
Abandoned
Application number
US14/363,891
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English (en)
Inventor
Philipp Althöfer
Thomas Kühne
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.)
AEROCYCLE GmbH
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AEROCYCLE GmbH
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Filing date
Publication date
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Application filed by AEROCYCLE GmbH filed Critical AEROCYCLE GmbH
Publication of US20140352902A1 publication Critical patent/US20140352902A1/en
Abandoned legal-status Critical Current

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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
    • D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
    • 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
    • D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
    • D21B1/061—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods using cutting 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
    • D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
    • D21B1/08—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods the raw material being waste paper; the raw material being rags
    • 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 invention concerns a method for preparing and obtaining fibres for producing paper or similar, such as for example insulating material, from a fibre-containing material, in particular from waste paper. It also concerns the use of this method for document destruction.
  • waste paper is basically dissolved in bundled and possibly pressed form in a pulper. To this end the pulper is filled with water. Then the waste paper or the pulp is introduced and using a propeller dissolved and disintegrated there. In the pulper the paper can also undergo a de-inking process using chemicals. Then the fibrous suspension is pumped out and processed further.
  • the consistency dry mass of waste paper/(dry mass of waste paper+water)
  • Pulp can also be dissolved with high consistency pulpers. The consistency that can be achieved here is between 12 and 18%. Here the mixture dissolves better, allowing energy and space to be saved. This is due to the fact that because of the higher consistency and the lower water content the shearing forces between the fibres are significantly higher. For pumping out the mixture must then be thinned to a consistency of approximately 5%, however.
  • the fibre suspension passes through a deflaker, in which the fibre bundles (specks) are broken down into their individual fibres. This takes place by loosening the external fibre wall layer and serves to increase the degree of swelling of the fibres.
  • Impurities sand and so on are then removed from the fibre suspension in a cleaner before it is passed to a refiner. In the latter the fibres are loosened and possibly disintegrated further.
  • the fibre pulp is first diluted with water from the sieve of a paper machine, and then fillers are also added. Whether these fillers are added here or during sizing in the paper machine depends on the paper's use.
  • the waste paper fibres are shortened or damaged, in particular split in the longitudinal direction, or that the degree of grinding is increased, since the waste paper has already been prepared at least once for paper manufacture.
  • plastic films, plastic parts, sand or similar contained in the waste paper should as far as possible not be broken down, in order that it can subsequently be easily removed.
  • the object of the present invention is to provide a method of the kind already stated at the beginning, in which the shortening of the fibres is minimised.
  • dry pulping shall mean that the waste paper is not pulped within a suspension in water, and thus water is not used in the pulping of the waste paper as a carrier and means of transport for the waste paper, but that it is pulped in such a way that the waste paper, once it has been pulped by impact action, is present in the form of a solid mixture.
  • the consistency of the waste paper to be pulped is advantageously in a range of 40% to 99%, preferably between 50% and 95% and particularly preferably between 80% or 85% and 95%.
  • the consistency is quite significantly higher than the consistency of up to 18% when waste paper is dissolved in aqueous dispersion.
  • the waste paper is preferably, unlike when feeding a pulper, introduced into the container for pulping without wires to hold the bales together, since these are not needed. In this way the normal pigtail of knotted wires and the coarse substances trapped within them can be avoided.
  • one or more, in particular flexible, impact tools are preferably used.
  • One or more driven chains within a container, supported centrally on the base of the container and rotating at high speed, have proven to be particularly effective for this purpose.
  • the pulping of the fibre-containing material takes place very gently in particular if the chain links have a rounded design in all directions, such that they have no corners or edges, which could cause nicks in the fibre material.
  • Cross-flow shredders in particular, which are used inter alia for breaking up scrap materials such as refrigerators, are particularly suitable for the dry pulping of fibre materials. With a cross-flow shredder having a chain length of 40 cm at between 700 and 1 700 rpm exceptional results have been achieved.
  • the method according to the invention has, inter alia, the advantage that the additives and debris are dissolved out of the waste paper dry.
  • This has the advantage, firstly, that following pulping of the waste paper these can be separated from the fibres as dry fractions, for example making use of the difference in particle inertia, particle size or particle density, with the help of for example sieves, air separators and/or centrifuges. This can take place actually during (for example using a sieve or air separator) or also after pulping.
  • a window with a sieve can be inserted, through which the pulped fibre material can emerge from the container, once it has been disaggregated to a size predetermined by the sieve.
  • additives do not have to be separated from the process water as is the case with the preparation of waste paper in aqueous suspension.
  • the pulped fibre material can, once it has left the container for pulping, be transported via screw conveyors to further processing stations. If during transport any further foreign matter has to be separated from the fibre material, vibration conveyors can be provided for the purpose.
  • the fibre-containing material can have kraft fibre paper can be added, which is pulped together with the other fibre material.
  • Kraft fibre paper contains particularly long and stable fibres, the length of which is at least almost completely preserved in the preparation according to the invention. These long fibres in the mixture created of prepared fibres then serve as a kind of reinforcement in the paper ensuring particular strength.
  • the fibres obtained with the method according to the invention it is then sufficient for them to be mixed with water in a subsequent swelling vat or agitation vat, in order to provide the fibre pulp for paper manufacture.
  • the method according to the invention also provides further quite significant advantages. Firstly, by dispensing with water as the carrier, energy consumption is significantly reduced since significantly less mass has to be shifted when pulping the waste paper. Thus for the same energy expenditure 18 times the quantity of fibres (with reference to the absolute dry quantity of fibres) can be throughput.
  • Water consumption is also necessarily lower.
  • the contact time required between the waste paper and the water it contains is approximately 2 to 4 hours less than in a conventional method with a pulper.
  • the loading of the water with impurities entering into solution such as for example COD or calcium, is significantly reduced.
  • the method according to the invention can also be used for efficient document destruction. If, for example, a cross-flow shredder is used the paper of the documents to be destroyed is disaggregated and at the same time separated from other components of the documents, for example any metal parts or plastics. In doing so the paper is broken down into its fibres, so that any information printed on it is irretrievably destroyed.
  • the method is superior to any conventional method of document destruction and allows the preparation of the paper material as fibres, which can be directly reused for paper manufacture.
  • FIG. 1 shows the essential steps of a conventional method for waste paper preparation.
  • the pulper 1 is loaded with the fibre material to be prepared and water, so that the fibre material is dissolved.
  • a subsequent drainage vat 2 and a high-consistency cleaner 3 the suspension pumped from the pulper 1 is cleaned of coarse debris.
  • the remaining fibre material suspension is passed to a deflaker, in which the fibre bundles still present are separated into individual fibres and the fibres disintegrated.
  • the fine debris is removed, before the remaining cleaned fibre suspension then has the additives necessary for paper manufacture mixed-in in a mixing vat 6 .
  • the resulting paper pulp is then passed to the headbox 7 of the paper machine.
  • the highly efficient process according to the invention provides merely for an FRT (fibre refreshing technology) reactor, for example in the form of a cross-flow shredder 11 , in which moist fibre-containing material without water as the carrier fluid is prepared by impacting of the individual fibres.
  • FRT field refreshing technology
  • a subsequent cleaning 12 the separated, almost entirely dry fractions are separated using a suitable conventional separation method.
  • the fibres produced in this way are then placed in a swelling vat or agitation vat 13 , in which the fibres can swell (again) and any additives necessary according to the type of paper to be manufactured can be mixed into the fibre.
  • the pulp produced in the swelling vat 13 is then passed to the headbox 14 of a paper machine.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
US14/363,891 2011-12-09 2012-12-07 Method for preparing waste paper Abandoned US20140352902A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE201110120630 DE102011120630A1 (de) 2011-12-09 2011-12-09 Verfahren zur Altpapieraufbereitung
DE102011120630.6 2011-12-09
PCT/EP2012/074809 WO2013083784A2 (fr) 2011-12-09 2012-12-07 Procédé de traitement de vieux papiers

Publications (1)

Publication Number Publication Date
US20140352902A1 true US20140352902A1 (en) 2014-12-04

Family

ID=47351646

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/363,891 Abandoned US20140352902A1 (en) 2011-12-09 2012-12-07 Method for preparing waste paper

Country Status (9)

Country Link
US (1) US20140352902A1 (fr)
EP (1) EP2788544B2 (fr)
CN (1) CN104080972A (fr)
DE (1) DE102011120630A1 (fr)
DK (1) DK2788544T3 (fr)
ES (1) ES2613549T3 (fr)
PL (1) PL2788544T3 (fr)
PT (1) PT2788544T (fr)
WO (1) WO2013083784A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11724414B2 (en) * 2017-07-31 2023-08-15 Seiko Epson Corporation Defibrated material manufacturing device

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3740614A1 (fr) * 2018-01-15 2020-11-25 Voith Patent GmbH Procédé et dispositif de fabrication d'une natte en fibres
CN108408271B (zh) * 2018-02-13 2019-04-12 天津市赛鹏环保科技有限公司 一种可追踪液体危险废物安全卸料系统
CN109024025B (zh) * 2018-09-12 2020-10-16 王晨宇 一种废纸再生工艺方法
CN109926170B (zh) * 2019-03-07 2021-03-23 天津和或节能科技有限公司 一种文件销毁方法及其文件销毁系统
CN112176753A (zh) * 2020-09-30 2021-01-05 江苏理文造纸有限公司 一种温和碎浆工艺
DE202021100642U1 (de) 2021-02-09 2022-05-11 AEROCYCLE GmbH Cologne - London Vorrichtung zum Zerkleinern und/oder Aufbereiten von Materialien und Verwendung einer solchen Vorrichtung
DE102022132971A1 (de) 2022-12-12 2024-06-13 PWA recycling concept GmbH Vorrichtung zum Zerkleinern und/oder Aufbereiten von Material, Anordnung und Verfahren

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US4036679A (en) * 1975-12-29 1977-07-19 Crown Zellerbach Corporation Process for producing convoluted, fiberized, cellulose fibers and sheet products therefrom
US4252279A (en) * 1977-12-09 1981-02-24 Sodra Skogsagarna Ab Method for dry-defibration of chemical, chemi-mechanical and mechanical fiber pulp or mixtures thereof
US5253815A (en) * 1990-10-31 1993-10-19 Weyerhaeuser Company Fiberizing apparatus
US5587048A (en) * 1992-04-06 1996-12-24 Westvaco Corporation Pulp and paper products produced from recycled, high lignin content, waste paper
US20050115690A1 (en) * 2003-11-25 2005-06-02 Casella Waste Systems, Inc. Methods for producing recycled pulp from waste paper
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US4036679A (en) * 1975-12-29 1977-07-19 Crown Zellerbach Corporation Process for producing convoluted, fiberized, cellulose fibers and sheet products therefrom
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US5253815A (en) * 1990-10-31 1993-10-19 Weyerhaeuser Company Fiberizing apparatus
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US20050115690A1 (en) * 2003-11-25 2005-06-02 Casella Waste Systems, Inc. Methods for producing recycled pulp from waste paper
US20060157389A1 (en) * 2005-01-18 2006-07-20 Turbo Air Defibering Apparatus for defibering paper or dry pulp

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11724414B2 (en) * 2017-07-31 2023-08-15 Seiko Epson Corporation Defibrated material manufacturing device

Also Published As

Publication number Publication date
EP2788544B2 (fr) 2023-05-24
DK2788544T3 (en) 2017-02-13
CN104080972A (zh) 2014-10-01
EP2788544B1 (fr) 2016-11-02
ES2613549T3 (es) 2017-05-24
DE102011120630A1 (de) 2013-06-13
PL2788544T3 (pl) 2017-07-31
WO2013083784A2 (fr) 2013-06-13
PT2788544T (pt) 2017-02-10
EP2788544A2 (fr) 2014-10-15
WO2013083784A3 (fr) 2013-08-22

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