WO1994024364A1 - Improvements in or relating to deinking of paper - Google Patents

Improvements in or relating to deinking of paper Download PDF

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Publication number
WO1994024364A1
WO1994024364A1 PCT/GB1994/000842 GB9400842W WO9424364A1 WO 1994024364 A1 WO1994024364 A1 WO 1994024364A1 GB 9400842 W GB9400842 W GB 9400842W WO 9424364 A1 WO9424364 A1 WO 9424364A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
ink
magnet
paper waste
paper
Prior art date
Application number
PCT/GB1994/000842
Other languages
English (en)
French (fr)
Inventor
David Owen
Original Assignee
Chemisolv Limited
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 Chemisolv Limited filed Critical Chemisolv Limited
Priority to JP52293894A priority Critical patent/JPH08509030A/ja
Priority to BR9406482A priority patent/BR9406482A/pt
Priority to AU65420/94A priority patent/AU6542094A/en
Priority to RU95122629A priority patent/RU2126860C1/ru
Priority to EP19940913168 priority patent/EP0697043A1/en
Publication of WO1994024364A1 publication Critical patent/WO1994024364A1/en
Priority to FI954981A priority patent/FI954981A/fi

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
    • D21C5/025—De-inking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/002—High gradient magnetic separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/005—Pretreatment specially adapted for magnetic separation
    • B03C1/01—Pretreatment specially adapted for magnetic separation by addition of magnetic adjuvants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/04—Magnetic separation acting directly on the substance being separated with the material carriers in the form of trays or with tables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/26—Magnetic separation acting directly on the substance being separated with free falling material
    • 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 concerns improvements in or relating to the dein ing of paper. More particularly, the present invention is concerned with the recovery of paper for recycling purposes, which paper has all traces, or substantially all traces, of ink removed therefrom. More particularly, the invention is concerned with the recycling of high quality white paper utilised in the production of recycled photocopier and laser print paper.
  • the present invention is based on the discovery that the ink utilised in laser and xerographic printed papers is comprised of a thermoplastic resin (usually PVC) containing carbon black as pigment and usually ferric oxide to assist in handling the dry ink in the printing device.
  • a thermoplastic resin usually PVC
  • carbon black as pigment
  • ferric oxide to assist in handling the dry ink in the printing device.
  • a method of dry separating and/or sorting laser and xerographic printed paper waste containing ink with a magnetic component from other paper waste products containing ink but which does not contain any magnetic material by the use of at least one magnet and by applying an appropriate magnetic force.
  • any suitable magnet may be utilised although same should be sufficiently strong in order to separate the paper containing ink with a magnetic component from paper containing ink but without such magnetic component.
  • Suitable magnets would be an electromagnet, a permanent magnet or a superconducting magnet.
  • a mixture of paper waste products would be allowed to fall substantially vertically past at least one operating magnet and the paper waste containing ink with a magnetic component would be magnetically drawn to one side and collected.
  • Any suitable procedure can be adopted in this regard.
  • the operating magnet(s) should apply a magnetic force over a large area of the body of paper being treated. Magnetic force is a function of two variables:
  • Magnetic flux density is the product of magnetic field strength (or intensity) and permeability of a material.
  • the magnetic field strength (intensity) is the magnitude of the field strength vector in a medium (i.e. the magnetic strain produced by neighbouring magnetic elements or current-carrying conductors) .
  • this aspect of the present invention would be of benefit to waste paper merchants or in mills which wish to select the particular type of paper for one particular operation in the mill, for example, production of recycled paper suitable for laser or xerographic copier paper.
  • the residual paper could then be used for production of a lower grade of recycled paper.
  • Suitable magnetic forces are achieved by utilising background magnetic fields in excess of 4000 Gauss (4 tesla) and a field gradient in excess of 1000 Gauss/cm (10 tesla/m) .
  • a high gradient magnetic separation device can be envisaged which will not require such high input field strengths. It is the magnetic field gradient that is important to effect the separation. There are several types of high gradient machine designs. These devices have been called "induced pole" devices.
  • Suitable devices in this connection are for example:-
  • Kolm-Marston separator suitably modified for utilisation with pulping techniques.
  • a method of removing magnetic ink from pulp stock formed from xerographic and laser printed paper waste to provide high brightness paper which is spot free comprising feeding such pulped paper waste past at least one magnet for removal of all or substantially all of such magnetic ink.
  • all the print is xerographic (there may be some conventional printing on the paper such as headings, logos etc.)
  • such method would allow for recycling of the ash present in the paper as well as the fibre, thereby increasing the yield.
  • the ink which is normally melted on to the paper has not separated fully from the fibre of the paper after treatment in the pulper, then those fibres with ink still attached thereto would also be removed with such ink by the magnet(s) . Accordingly, the spot removal efficiency is improved since when recycling paper to produce high quality paper one does not require bits of fibre which have ink attached thereto.
  • the arrangement of the at least one magnet will be so designed in order to exert a magnetic force comprising a background magnetic field of preferably at least 4000 Gauss and a field gradient preferably of at least 1000 Gauss/cm.
  • a plurality of magnets are utilised and the pulp stock is fed along an elongate channel-type container housing.
  • the magnetic force is presented to the pulp in such a way that it will allow small magnetic particles to be captured or deflected.
  • a method for improving the recyclability of paper waste having ink thereon which does not normally contain a magnetic component, by utilising one or more magnetic carriers in the formulations of the printing ink utilised, to enable same to be removed by use of at least one magnet in accordance with the procedures outlined above.
  • the present invention contemplates the use of a magnet of suitable strength to enable a particular type of printed paper to be separated from other types of paper and for ink contained on such paper to be removed during the pulping process, both processes utilising a magnet such as an electromagnet, a permanent magnet or a superconducting magnet. It is also envisaged within the present invention to incorporate one or more magnetic carriers or fillers into other types of inks and adhesive or materials utilised in the paper manufacturing industry, so as to enable such inks and other types of materials to be removed from the paper pulp when recycling is taking place, again by magnetic means.
  • any suitable ' magnet can be utilised providing same has sufficient field strength and intensity of field force. It is believed that a power of 10-20 kw would be sufficient to enable magnetic particles and the like to be removed as required.

Landscapes

  • Paper (AREA)
PCT/GB1994/000842 1993-04-21 1994-04-21 Improvements in or relating to deinking of paper WO1994024364A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP52293894A JPH08509030A (ja) 1993-04-21 1994-04-21 紙の脱インク処理に係る改良
BR9406482A BR9406482A (pt) 1993-04-21 1994-04-21 Aperfeiçoamentos em processo de destingimento de papel
AU65420/94A AU6542094A (en) 1993-04-21 1994-04-21 Improvements in or relating to deinking of paper
RU95122629A RU2126860C1 (ru) 1993-04-21 1994-04-21 Способ сухого сепарирования бумажных отходов с лазерной и ксероксной печатью от других бумажных отходов, способ удаления магнитной типографской краски из бумажной пульпы, способ переработки бумажных отходов, способ удаления клейкого материала из бумажной пульпы
EP19940913168 EP0697043A1 (en) 1993-04-21 1994-04-21 Improvements in or relating to deinking of paper
FI954981A FI954981A (fi) 1993-04-21 1995-10-19 Parannuksia paperin siistauksessa tai siihen liittyen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9308250.1 1993-04-21
GB9308250A GB9308250D0 (en) 1993-04-21 1993-04-21 Improvements in or relating to deinking of paper

Publications (1)

Publication Number Publication Date
WO1994024364A1 true WO1994024364A1 (en) 1994-10-27

Family

ID=10734223

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/000842 WO1994024364A1 (en) 1993-04-21 1994-04-21 Improvements in or relating to deinking of paper

Country Status (10)

Country Link
EP (1) EP0697043A1 (pt)
JP (1) JPH08509030A (pt)
CN (1) CN1122151A (pt)
AU (1) AU6542094A (pt)
BR (1) BR9406482A (pt)
CA (1) CA2161094A1 (pt)
FI (1) FI954981A (pt)
GB (2) GB9308250D0 (pt)
RU (1) RU2126860C1 (pt)
WO (1) WO1994024364A1 (pt)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2123328A1 (en) * 1993-12-13 1995-06-14 Kimberly-Clark Worldwide, Inc. Magnetic deinking
US5527426A (en) * 1994-01-21 1996-06-18 Westvaco Corporation Magnetic deinking of waste papers
KR100301941B1 (ko) * 1996-03-08 2001-10-29 루케 존 이에 폐지의자기탈묵법
CN1077185C (zh) * 1996-03-08 2002-01-02 维思特瓦苛有限公司 废纸的磁性去墨方法
CN1081259C (zh) * 1996-03-22 2002-03-20 曾其祥 清除云母造纸纸面斑点的生产方法及其设备
JP6458530B2 (ja) * 2015-02-16 2019-01-30 セイコーエプソン株式会社 シート製造装置、シート製造方法、古紙処理装置
CN104827372B (zh) * 2015-04-28 2017-03-01 西南交通大学 一种打印纸机械脱墨方法及其装置
GB202217404D0 (en) * 2022-11-21 2023-01-04 Univ Swansea Conductive ink

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176054A (en) * 1977-05-16 1979-11-27 Kelley Joseph A Waste paper recycling
JPS6456156A (en) * 1987-08-26 1989-03-03 Meiwa Seishi Genryo Kk Separation and recovering method for paper pulp component from magnetic recording paper and device used therefor
JPH01184048A (ja) * 1988-01-18 1989-07-21 Meiwa Seishi Genryo Kk 磁気記録紙よりなる古紙と非磁気記録紙よりなる古紙との混合物より両者を分離回収する方法およびそれに用いる装置
DE4124990A1 (de) * 1991-07-27 1993-01-28 Voith Gmbh J M Magnetfeld-trenneinrichtung zum abschneiden ferromagnetischer metallteile aus suspensionen, insbesondere aus bei der wiederverarbeitung von altpapier anfallenden suspensionen
US5217573A (en) * 1992-04-23 1993-06-08 International Paper Company Removal of laser printer and xerographic ink from recycle paper

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1009804A (en) * 1973-10-25 1977-05-10 National Research Council Of Canada Ink removal from waste paper
US4273847A (en) * 1976-07-30 1981-06-16 Epp Corp. Inks for pulsed electrical printing and methods of producing same
US4187463A (en) * 1978-04-20 1980-02-05 Gilbert Kivenson Counterfeit detector for paper currency
JPS57205466A (en) * 1981-06-12 1982-12-16 Matsushita Electric Ind Co Ltd Magnetic ink for recording
JPS63288770A (ja) * 1987-05-20 1988-11-25 Mitsubishi Pencil Co Ltd インキ及び当該インキを使用したインキ吸蔵体を備えたプリンタ−
GB9104171D0 (en) * 1991-02-27 1991-04-17 British Ceramic Res Ltd Improved ink

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176054A (en) * 1977-05-16 1979-11-27 Kelley Joseph A Waste paper recycling
JPS6456156A (en) * 1987-08-26 1989-03-03 Meiwa Seishi Genryo Kk Separation and recovering method for paper pulp component from magnetic recording paper and device used therefor
JPH01184048A (ja) * 1988-01-18 1989-07-21 Meiwa Seishi Genryo Kk 磁気記録紙よりなる古紙と非磁気記録紙よりなる古紙との混合物より両者を分離回収する方法およびそれに用いる装置
DE4124990A1 (de) * 1991-07-27 1993-01-28 Voith Gmbh J M Magnetfeld-trenneinrichtung zum abschneiden ferromagnetischer metallteile aus suspensionen, insbesondere aus bei der wiederverarbeitung von altpapier anfallenden suspensionen
US5217573A (en) * 1992-04-23 1993-06-08 International Paper Company Removal of laser printer and xerographic ink from recycle paper

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 249 (C - 605) 9 June 1989 (1989-06-09) *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 472 (C - 647) 25 October 1989 (1989-10-25) *

Also Published As

Publication number Publication date
BR9406482A (pt) 1996-01-09
JPH08509030A (ja) 1996-09-24
GB9308250D0 (en) 1993-06-02
GB9407903D0 (en) 1994-06-15
FI954981A0 (fi) 1995-10-19
GB2277330B (en) 1997-11-05
CA2161094A1 (en) 1994-10-27
FI954981A (fi) 1995-10-19
EP0697043A1 (en) 1996-02-21
AU6542094A (en) 1994-11-08
GB2277330A (en) 1994-10-26
RU2126860C1 (ru) 1999-02-27
CN1122151A (zh) 1996-05-08

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