EP0312512A1 - Method of making three-layer paper - Google Patents

Method of making three-layer paper Download PDF

Info

Publication number
EP0312512A1
EP0312512A1 EP88850286A EP88850286A EP0312512A1 EP 0312512 A1 EP0312512 A1 EP 0312512A1 EP 88850286 A EP88850286 A EP 88850286A EP 88850286 A EP88850286 A EP 88850286A EP 0312512 A1 EP0312512 A1 EP 0312512A1
Authority
EP
European Patent Office
Prior art keywords
layer
layers
paper
intermediate layer
forming
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Withdrawn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
EP88850286A
Other languages
German (de)
French (fr)
Inventor
Alf De Ruvo
Ole Terland
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.)
SCA Nordliner AB
Original Assignee
SCA Development AB
SCA Nordliner AB
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 SCA Development AB, SCA Nordliner AB filed Critical SCA Development AB
Publication of EP0312512A1 publication Critical patent/EP0312512A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers

Definitions

  • This invention relates to a method of making a symmet­rical three-layer paper, more precisely a paper made of two heterogeneous stocks, preferably in that one stock forms the top layers of the paper and the other stock forms the intermediate layer thereof. It is known since long to make paper of several layers, especially at the manufacture of cardboard and kraft liner, i.e. for products having a grammage exceeding 100 g/m2. In most cases this is carried out in such a way., that the layers are formed separately and at a sufficient dry solids content are pressed together to bring about a multi-layer structure, so-called separate forming.
  • the advantages of this manufacturing method are - good control of the fibre distribution in the different layers - good possibilities of preventing admixture of fibres in the different layers - great possibilities of varying the grammage range by the number of layers and grammage/layer.
  • the disadvantages are - difficulty of maintaining the internal bond strength at more than two layers - higher capital costs.
  • Another method of making multy-layer paper is the so-called co-forming. This takes place in stratified head boxes, which implies that different stocks are ejected simultaneously through separate nozzles and form a combined jet out of the head box. Hereby, however, a considerable mixture of fibres between the layers can be obtained, and there are no possib­ilities of separating the white water.
  • This method does not yield advantages as great as the separate forming in respect of fibre control and grammage flexibility, but the capital costs are lower, and the decrease in internal bond strength at more than two layers is less great. It is, thus, previously known to use multi-layer head boxes where all layers are formed simultaneously.
  • the Figure in said specification shows an arrangement for the manufacture of a three-layer paper, comprising an inner wire 1 and an outer wire 4. From a head box 9 stock is ejected on the wire 1 and dewatered, where­after stock from another box 10 is ejected on the web, and additional dewatering is carried out by means of a roll 2, and the two layers are passed between the inner and the outer wire.
  • the second surface layer is formed of pulp suspension from a third head box 14 on a wire 8 and combined with the two other layers at the turning roll 7.
  • the two top layers and substantially half the intermediate layer shall be formed by co-forming from two separate head boxes, and the two layers then are combined by separate forming.
  • the method according to the invention is especially suitable for use at the manufacture of high-quality fine paper, especially suitable for copying in xerography. According to the invention, only two separately formed layers are required for bringing about a three-layer structure. At the method according to the invention, a top side is pressed against a top side, which yields good symmetry and a better internal bond strength than at co-forming where dewatering occurs in both dir­ections.
  • the invention also renders it possible to permit high hydrodynamic flows, because the number of layers in a box is restricted to two, and the dewatering distance can be adjusted to the dewatering demand. It is hereby possible to use low concentrations in the intermediate layer, and a high proportion of short fibres, possibly with high beating degree, in the outer layer in order to obtain a good surface. The low concentration makes it possible to form a paper with good appearance and long fibres (softwood).
  • the invention therefore, can combine multi-layer technique with increasing possibilities of using long fibres. At present at least 50% hardwood is used in fine paper. By using the above technique it shall be possible to freely choose the proportions of long fibres and short fibres in the intermediate layer and thereby reduce substantially the dependence on wood at the making of a fully satisfactory fine paper.
  • the bending stiffness can come close to the theor­etical level of a layer structure. This implies an improvement of about 20% of the bending stiffness at a fibre mixture of 50% birch fibre and 50% long fibre.
  • the high-beaten short fibre on the surface yields a high smoothness, which reduces the demand of glazing.
  • the intermediate layer filling agent can be applied to reduce the risk of sediments and wear from the paper surface.
  • the method according to the invention yields a paper with - higher bending stiffness - higher symmetry - free choice of fibre mixtures possibility of high filling agent proportion.
  • the intermediate layer is formed at low head box concentration, and the outer layer is formed at a higher one.
  • the Figure shows a wire 15 running over the breast rolls 13,14.
  • a head box 1 with layers 2 and 3 the stock for one top layer is passed through 3 and half the grammage for the intermediate layer through 2 in order to form the co-formed web 18 on the wire.
  • Dewatering takes place at 16.
  • the head box 4 which also comprises two layers 5 and 6, the stock is passed in the same way for the top layer through 5 and about half the grammage for the intermediate layer through 6.
  • the resulting web 20 is dewatered at 10 through the wire 19.
  • the wire with the web 20 then runs over the roll 9 and is separately formed with the web 18 at the press roll 12.
  • the complete thre-layer paper then consists of the top layers 21 and 23 and the intermediate layer 22.

Abstract

The invention relates to a method of making a symm­etrical three-layer paper of two heterogeneous stocks, one of which forms the top layers of the paper, and the other one forms the intermediate layer thereof. According to the invention, the top layer and subst­antially half the grammage of the intermediate layer are formed by co-forming in two separate head boxes, whereafter the two separately formed layers are combined at a dry solids content not exceeding 12%.

Description

  • This invention relates to a method of making a symmet­rical three-layer paper, more precisely a paper made of two heterogeneous stocks, preferably in that one stock forms the top layers of the paper and the other stock forms the intermediate layer thereof.
    It is known since long to make paper of several layers, especially at the manufacture of cardboard and kraft liner, i.e. for products having a grammage exceeding 100 g/m². In most cases this is carried out in such a way., that the layers are formed separately and at a sufficient dry solids content are pressed together to bring about a multi-layer structure, so-called separate forming. The advantages of this manufacturing method are
    - good control of the fibre distribution in the different layers
    - good possibilities of preventing admixture of fibres in the different layers
    - great possibilities of varying the grammage range by the number of layers and grammage/layer.
  • The disadvantages are
    - difficulty of maintaining the internal bond strength at more than two layers
    - higher capital costs.
  • Another method of making multy-layer paper is the so-called co-forming. This takes place in stratified head boxes, which implies that different stocks are ejected simultaneously through separate nozzles and form a combined jet out of the head box. Hereby, however, a considerable mixture of fibres between the layers can be obtained, and there are no possib­ilities of separating the white water. This method does not yield advantages as great as the separate forming in respect of fibre control and grammage flexibility, but the capital costs are lower, and the decrease in internal bond strength at more than two layers is less great.
    It is, thus, previously known to use multi-layer head boxes where all layers are formed simultaneously.
  • One method of making multi-layer paper is described in WO 85/05387.
  • The Figure in said specification shows an arrangement for the manufacture of a three-layer paper, comprising an inner wire 1 and an outer wire 4. From a head box 9 stock is ejected on the wire 1 and dewatered, where­after stock from another box 10 is ejected on the web, and additional dewatering is carried out by means of a roll 2, and the two layers are passed between the inner and the outer wire.
    The second surface layer is formed of pulp suspension from a third head box 14 on a wire 8 and combined with the two other layers at the turning roll 7.
  • According to the invention, however, the two top layers and substantially half the intermediate layer shall be formed by co-forming from two separate head boxes, and the two layers then are combined by separate forming.
    The method according to the invention is especially suitable for use at the manufacture of high-quality fine paper, especially suitable for copying in xerography.
    According to the invention, only two separately formed layers are required for bringing about a three-layer structure.
    At the method according to the invention, a top side is pressed against a top side, which yields good symmetry and a better internal bond strength than at co-forming where dewatering occurs in both dir­ections.
    The invention also renders it possible to permit high hydrodynamic flows, because the number of layers in a box is restricted to two, and the dewatering distance can be adjusted to the dewatering demand. It is hereby possible to use low concentrations in the intermediate layer, and a high proportion of short fibres, possibly with high beating degree, in the outer layer in order to obtain a good surface. The low concentration makes it possible to form a paper with good appearance and long fibres (softwood). The invention, therefore, can combine multi-layer technique with increasing possibilities of using long fibres. At present at least 50% hardwood is used in fine paper. By using the above technique it shall be possible to freely choose the proportions of long fibres and short fibres in the intermediate layer and thereby reduce substantially the dependence on wood at the making of a fully satisfactory fine paper. By applying a separate forming technique, the bending stiffness can come close to the theor­etical level of a layer structure. This implies an improvement of about 20% of the bending stiffness at a fibre mixture of 50% birch fibre and 50% long fibre. The high-beaten short fibre on the surface yields a high smoothness, which reduces the demand of glazing. In the intermediate layer filling agent can be applied to reduce the risk of sediments and wear from the paper surface.
    By joining two identically formed layers, so that the wire sides constitute outer sides, a sheet is obtained which has perfect symmetry, which is considerably better than the one obtained if the sheet had been formed in a single step. This is due to the fact, that the flow forces during draining tend to distribute the fine material obliquely in the transverse direct­ion of the sheet. There is more fine material on the surface than toward the wire, where the flow has been strongest. A sheet formed in a single step, there­fore, always shows a greater or smaller difference in the properties in the transverse direction of the sheet. The only way of making an entirely symmetrical sheet, therefore, is to join two identically formed layers with the top sides or wire sides against each other. The wire sides are unsuitable, because the lack of fine fibres results in a low internal bond strength. The invention makes use of these facts so as to make a sheet with highest possible symmetry, which sheet, therefore, has extreme dimension stabil­ity. Since this is a requirement on a paper capable to be used in a copying machine, this implies that a paper manufactured according to the invention is extremely suitable for use as copying paper.
  • Conclusively, the method according to the invention yields a paper with
    - higher bending stiffness
    - higher symmetry
    - free choice of fibre mixtures
    possibility of high filling agent proportion.
  • According to a special embodiment of the method according to the invention, the intermediate layer is formed at low head box concentration, and the outer layer is formed at a higher one.
  • The invention is described in the following by way of an embodiment thereof and with reference to the accompanying drawing.
    • EXAMPLE
  • The Figure shows a wire 15 running over the breast rolls 13,14. From a head box 1 with layers 2 and 3 the stock for one top layer is passed through 3 and half the grammage for the intermediate layer through 2 in order to form the co-formed web 18 on the wire. Dewatering takes place at 16. From the head box 4, which also comprises two layers 5 and 6, the stock is passed in the same way for the top layer through 5 and about half the grammage for the intermediate layer through 6. The resulting web 20 is dewatered at 10 through the wire 19. The wire with the web 20 then runs over the roll 9 and is separately formed with the web 18 at the press roll 12. The complete thre-layer paper then consists of the top layers 21 and 23 and the intermediate layer 22.
  • The invention is not restricted to the embodiment shown and described, but can be varied within the scope of the invention idea.

Claims (5)

1. A method of making a symmetrical three-layer paper of two heterogeneous stocks, one of which forms the top layers of the paper, and the other stock forms the intermediate layer of the paper, characterized in that the top layers and substantially half the grammage for the inter­mediate layer are formed by co-forming in two separ­ate head boxes, and that the two separately formed layers are combined at a dry solids content not ex­ceeding 12%.
2. A method as defined in claim 1, charact­erized in that the intermediate layer is formed at a low head box concentration of 0,1-1,0%, and the outer layer at a higher concentration of 0,3-1,2%.
3. A method as defined in claim 1, charact­erized in that the top layers in the respective co-formed layers are pressed against each other at the subsequent separate forming.
4. A method as defined in claim 1, charact­erized in that the stock for forming the outer layer contains a proportion of short fibres of 80-100%, possibly with high beating degree, and the intermediate layer a proportion of long fibres of 70-100%.
5. A method as defined in claim 1, charact­erized in that to the stock for forming the intermediate layer a filling agent in an amount of at least 10% is added.
EP88850286A 1987-10-16 1988-08-31 Method of making three-layer paper Withdrawn EP0312512A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8704040 1987-10-16
SE8704040A SE459263B (en) 1987-10-16 1987-10-16 SAVED TO MAKE WOODEN PAPER PAPERS

Publications (1)

Publication Number Publication Date
EP0312512A1 true EP0312512A1 (en) 1989-04-19

Family

ID=20369911

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88850286A Withdrawn EP0312512A1 (en) 1987-10-16 1988-08-31 Method of making three-layer paper

Country Status (8)

Country Link
EP (1) EP0312512A1 (en)
BR (1) BR8805033A (en)
DE (1) DE312512T1 (en)
ES (1) ES2007585A4 (en)
FI (1) FI884763A (en)
NO (1) NO884590L (en)
PT (1) PT88754A (en)
SE (1) SE459263B (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568404A1 (en) * 1992-04-17 1993-11-03 Kimberly-Clark Corporation Method of treating papermaking fibers for making tissue
EP0653516A1 (en) * 1993-11-17 1995-05-17 Enso-Gutzeit Oy Lignocellulosic-material-based product and manufacturing method thereof
WO1995016070A1 (en) * 1993-12-08 1995-06-15 Beloit Technologies, Inc. Machine and method for forming multi-ply linerboard from two sheets
US5501768A (en) * 1992-04-17 1996-03-26 Kimberly-Clark Corporation Method of treating papermaking fibers for making tissue
WO1996035018A1 (en) * 1995-05-05 1996-11-07 Kimberly-Clark Worldwide, Inc. Decorative formation of tissue
DE19526205A1 (en) * 1995-07-18 1997-01-30 Voith Sulzer Stoffaufbereitung Multilayer paper or board-making process and appts. - uses stocks having high and low proportion of fines, latter being used to form inner and former to form outer layers of web.
US5746889A (en) * 1996-10-18 1998-05-05 Valmet Corporation Stock feed system for a multi-layer headbox and method in the operation of a multi-layer headbox
US5804036A (en) * 1987-07-10 1998-09-08 The Procter & Gamble Company Paper structures having at least three regions including decorative indicia comprising low basis weight regions
US5820730A (en) * 1991-06-28 1998-10-13 The Procter & Gamble Company Paper structures having at least three regions including decorative indicia comprising low basis weight regions
US6136146A (en) * 1991-06-28 2000-10-24 The Procter & Gamble Company Non-through air dried paper web having different basis weights and densities
US6464831B1 (en) 1998-02-03 2002-10-15 The Procter & Gamble Company Method for making paper structures having a decorative pattern
DE10122047A1 (en) * 2001-05-07 2002-11-14 Voith Paper Patent Gmbh Sheet forming device and method
US6585901B2 (en) 1999-12-23 2003-07-01 Metso Paper, Inc. Method of draining water from low-consistency water-fiber suspensions
DE10223398A1 (en) * 2002-05-25 2003-12-04 Voith Paper Patent Gmbh A forming apparatus
WO2012041392A1 (en) * 2010-10-01 2012-04-05 Metso Paper, Inc. Device and method for manufacturing a web consisting of multiple layers
WO2019154540A1 (en) * 2018-02-09 2019-08-15 Voith Patent Gmbh Method and device for producing a multilayer fibrous web
EP3567149A3 (en) * 2018-01-30 2020-01-22 Seiko Epson Corporation Sheet manufacturing apparatus and sheet manufacturing method
SE1951507A1 (en) * 2019-12-19 2021-06-20 Stora Enso Oyj A light weight linerboard for corrugated board

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985005387A1 (en) * 1984-05-11 1985-12-05 A. Ahlström Corporation Method for manufacturing multilayer board

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985005387A1 (en) * 1984-05-11 1985-12-05 A. Ahlström Corporation Method for manufacturing multilayer board

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5804036A (en) * 1987-07-10 1998-09-08 The Procter & Gamble Company Paper structures having at least three regions including decorative indicia comprising low basis weight regions
US6136146A (en) * 1991-06-28 2000-10-24 The Procter & Gamble Company Non-through air dried paper web having different basis weights and densities
US5820730A (en) * 1991-06-28 1998-10-13 The Procter & Gamble Company Paper structures having at least three regions including decorative indicia comprising low basis weight regions
US5348620A (en) * 1992-04-17 1994-09-20 Kimberly-Clark Corporation Method of treating papermaking fibers for making tissue
US5501768A (en) * 1992-04-17 1996-03-26 Kimberly-Clark Corporation Method of treating papermaking fibers for making tissue
EP0568404A1 (en) * 1992-04-17 1993-11-03 Kimberly-Clark Corporation Method of treating papermaking fibers for making tissue
EP0653516A1 (en) * 1993-11-17 1995-05-17 Enso-Gutzeit Oy Lignocellulosic-material-based product and manufacturing method thereof
WO1995016070A1 (en) * 1993-12-08 1995-06-15 Beloit Technologies, Inc. Machine and method for forming multi-ply linerboard from two sheets
WO1996035018A1 (en) * 1995-05-05 1996-11-07 Kimberly-Clark Worldwide, Inc. Decorative formation of tissue
US6203663B1 (en) 1995-05-05 2001-03-20 Kimberly-Clark Worldwide, Inc. Decorative formation of tissue
DE19526205A1 (en) * 1995-07-18 1997-01-30 Voith Sulzer Stoffaufbereitung Multilayer paper or board-making process and appts. - uses stocks having high and low proportion of fines, latter being used to form inner and former to form outer layers of web.
DE19526205C2 (en) * 1995-07-18 2000-08-17 Voith Sulzer Stoffaufbereitung Process and plant for producing a multilayer paper or cardboard web
US5746889A (en) * 1996-10-18 1998-05-05 Valmet Corporation Stock feed system for a multi-layer headbox and method in the operation of a multi-layer headbox
US6464831B1 (en) 1998-02-03 2002-10-15 The Procter & Gamble Company Method for making paper structures having a decorative pattern
US6585901B2 (en) 1999-12-23 2003-07-01 Metso Paper, Inc. Method of draining water from low-consistency water-fiber suspensions
DE10122047A1 (en) * 2001-05-07 2002-11-14 Voith Paper Patent Gmbh Sheet forming device and method
DE10223398A1 (en) * 2002-05-25 2003-12-04 Voith Paper Patent Gmbh A forming apparatus
WO2012041392A1 (en) * 2010-10-01 2012-04-05 Metso Paper, Inc. Device and method for manufacturing a web consisting of multiple layers
EP3567149A3 (en) * 2018-01-30 2020-01-22 Seiko Epson Corporation Sheet manufacturing apparatus and sheet manufacturing method
WO2019154540A1 (en) * 2018-02-09 2019-08-15 Voith Patent Gmbh Method and device for producing a multilayer fibrous web
CN111684128A (en) * 2018-02-09 2020-09-18 福伊特专利有限公司 Method and device for producing a multi-layered fibrous web
SE1951507A1 (en) * 2019-12-19 2021-06-20 Stora Enso Oyj A light weight linerboard for corrugated board
WO2021124040A1 (en) * 2019-12-19 2021-06-24 Stora Enso Oyj A light weight linerboard for corrugated board
SE543829C2 (en) * 2019-12-19 2021-08-03 Stora Enso Oyj A light weight linerboard for corrugated board

Also Published As

Publication number Publication date
DE312512T1 (en) 1989-08-24
BR8805033A (en) 1989-05-09
SE8704040L (en) 1989-04-17
SE8704040D0 (en) 1987-10-16
PT88754A (en) 1989-07-31
SE459263B (en) 1989-06-19
FI884763A0 (en) 1988-10-14
NO884590L (en) 1989-04-17
ES2007585A4 (en) 1989-07-01
NO884590D0 (en) 1988-10-14
FI884763A (en) 1989-04-17

Similar Documents

Publication Publication Date Title
EP0312512A1 (en) Method of making three-layer paper
FI98548C (en) Multilayer paper and process for making the same
US5916417A (en) Method of making multi-ply paperboard sheet having layers of different fiber properties
CA1296608C (en) Gypsum wallboard paper having imitation manila colored coating
US2098733A (en) Plyboard
US5080758A (en) Chemi-mechanical liner board
WO1985003316A1 (en) Paper with improved surface properties and method of making the same
EP1558813B1 (en) Method for producing fiber product
US20050039874A1 (en) Sheet forming device and method for sheet forming
JPH05239788A (en) Method and apparatus for production of multiply cellulosic board and product obtained thereby
DE69920426T2 (en) APPLYING AN ADJUSTMENT OF ADDITIVES TO THE SHEETING PART OF A CARTON MACHINE
EP3137680B1 (en) Process for producing at least one ply of a paper or board and a paper or board produced according to the process
US4961824A (en) Method for manufacturing multilayer board
US20020060003A1 (en) Machine for the manufacture of a fibrous plasterboard web
CA2140734A1 (en) Method and device for quality improvement in multilayer and multiply papers
JP2650533B2 (en) Medium paper for bulky offset printing
FI75383B (en) FOERFARANDE FOER FRAMSTAELLNING AV FLERSKIKTSKARTONG.
EP3540118B1 (en) Fiber web machine and method of forming a multi-ply web
EP0886006A2 (en) Wallpaper
US4957778A (en) Method of producing chemically self-copying or self-containing paper
EP3540119B1 (en) Fiber web machine and method of forming a multi-ply web
WO1984004115A1 (en) Multi-layer paper and method of making the same
EP0653516B1 (en) Lignocellulosic-material-based product and manufacturing method thereof
JPS5844800B2 (en) How to form a multilayer web
JPH05186998A (en) Production of paper

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE DE ES FR GB IT NL SE

ITCL It: translation for ep claims filed

Representative=s name: BARZANO ZANARDO S. P. A.

TCAT At: translation of patent claims filed
EL Fr: translation of claims filed
TCNL Nl: translation of patent claims filed
17P Request for examination filed

Effective date: 19890517

DET De: translation of patent claims
RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SCA NORDLINER AB

17Q First examination report despatched

Effective date: 19901214

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19910211

R18W Application withdrawn (corrected)

Effective date: 19910211