EP0172819A1 - Multi-layer paper and method of making the same - Google Patents

Multi-layer paper and method of making the same

Info

Publication number
EP0172819A1
EP0172819A1 EP19840901816 EP84901816A EP0172819A1 EP 0172819 A1 EP0172819 A1 EP 0172819A1 EP 19840901816 EP19840901816 EP 19840901816 EP 84901816 A EP84901816 A EP 84901816A EP 0172819 A1 EP0172819 A1 EP 0172819A1
Authority
EP
European Patent Office
Prior art keywords
layers
beaten
intensely
layer paper
maximum
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Withdrawn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
EP19840901816
Other languages
German (de)
French (fr)
Inventor
Myat Thoung Htun
Jonas Evert Lilja
Nils Christer Fellers
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.)
SVENSKA TRAEFORSKNINGSINSTITUTET
Original Assignee
Svenska Traforskningsinstitutet
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 Svenska Traforskningsinstitutet filed Critical Svenska Traforskningsinstitutet
Publication of EP0172819A1 publication Critical patent/EP0172819A1/en
Withdrawn legal-status Critical Current

Links

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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets

Definitions

  • Multi-layer paper and method of making the same are Multi-layer paper and method of making the same
  • This invention relates to a mult-layer paper, which for increasing the adhesion between the layers has been supplied with a binder, and to a method of making such paper.
  • the paper is manufactured by the couching of separately formed paper webs.
  • problems can arise if the adhesion forces between .the layers are not sufficiently great.
  • To-day the problems are coped with primarily either by increased beating of the pulps for each layer or by supplying starch in each layer or between the layers prior to couching.
  • Increased beating primarily involves the disadvantages of higher energy consumption, loss of bending stiffness of the cardboard due to decrease in thickness, and reduced machine capacity.
  • the addition of starch causes disadvantages such as high material, equipment and handling costs and clogging of the nozzles in spray installations.
  • the object of the present invention is to overcome the said disadvantages.
  • the principle of the invention is in a separate head box, spray nozzle or other application device to add a cellulose-based thin layer between two layers already formed.
  • the material in this thin layer can consist of intensely beaten papermaking pulp, fine material made separately, sedimented fine material or fibres and fine material from white water or other waters containing cellulose and fibres. It is essential that the material has a beating degree of at least 40°SR. The amount of added material must not exceed 10 g/m 2 .
  • the thin cellulose-based layer has the capacity of acting as a size layer increasing the adhesion capacity between the two layers formed.
  • the layer adhesion between two formed layers has a strength equal to the inner strength in each layer
  • the layer adhesion does not limit the general strength level.
  • the beating degree in each layer thus, can be chosen so that optimum bending stiffness is obtained.
  • Fig. 1 shows a machine design for making the paper according to the invention
  • Fig. 2 shows the Scott-bond value for different test conditions.
  • Fig. 1 shows a twin wire machine with the wires 1 and, respectively, 2.
  • a first pulp suspension is supplied through a head box 3 and results in a web 5.
  • a web 6 web 6 is formed by supplying a second pulp suspension through the head box 4.
  • the binder according to the invention consisted of an intensely beaten papermaking pulp with a beating degree of about 6 ⁇ °SR and was sprayed between the two already formed layers through the nozzle 7.
  • the amount of material applied was 5 g/m 2 .
  • the material was applied in a concentration of about 1% .
  • Each layer consisted of 75 g/m 2 unbleached sulphate pulp beaten to 18 or 27°SR. After the layers had been combined in usual manner, a web 8 was obtained which subsequent to its pressing in a number of rolls 8,9 yielded the two-layer paper 11.
  • Sheets of the paper were dried off-machine partially freely and partially clamped in frames. The results were compared to application of starch in the same amount and only water.
  • the diagram in Fig. 2 show-s the Scott-bond value (a measure of layer adhesion) for different test conditions.
  • the figure shows the Scott-bond values MD (machine direction) at constant press conditions (50 + 60 + 70 KN/m pressure applied). Besides, two drying methods have been used. As can be seen, the Scott-bond increases substantially with said additions and shows an effect equal to or better than with starch addition.

Landscapes

  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

Dans la fabrication de papier multicouche l'obtention d'une adhésion suffisante entre les couches de manière efficace et économique a souvent posé des problèmes. Selon l'invention ces problèmes sont résolus en insérant entre les couches une pulpe de cellulose possédant un degré de battage dépassant 40oSR en une quantité de 10g/m2 au maximum.In the production of multilayer paper obtaining sufficient adhesion between the layers in an efficient and economical manner has often posed problems. According to the invention these problems are solved by inserting between the layers a cellulose pulp having a degree of threshing exceeding 40oSR in an amount of 10 g / m2 at most.

Description

Multi-layer paper and method of making the same
This invention relates to a mult-layer paper, which for increasing the adhesion between the layers has been supplied with a binder, and to a method of making such paper. At the making of cardboard and other multi-layer paper, the paper is manufactured by the couching of separately formed paper webs. When the paper is used, problems can arise if the adhesion forces between .the layers are not sufficiently great. To-day the problems are coped with primarily either by increased beating of the pulps for each layer or by supplying starch in each layer or between the layers prior to couching.
Increased beating primarily involves the disadvantages of higher energy consumption, loss of bending stiffness of the cardboard due to decrease in thickness, and reduced machine capacity. The addition of starch causes disadvantages such as high material, equipment and handling costs and clogging of the nozzles in spray installations.
The object of the present invention is to overcome the said disadvantages.
The principle of the invention is in a separate head box, spray nozzle or other application device to add a cellulose-based thin layer between two layers already formed. The material in this thin layer can consist of intensely beaten papermaking pulp, fine material made separately, sedimented fine material or fibres and fine material from white water or other waters containing cellulose and fibres. It is essential that the material has a beating degree of at least 40°SR. The amount of added material must not exceed 10 g/m2. The thin cellulose-based layer has the capacity of acting as a size layer increasing the adhesion capacity between the two layers formed.
As the layer adhesion between two formed layers has a strength equal to the inner strength in each layer, the layer adhesion does not limit the general strength level. The beating degree in each layer, thus, can be chosen so that optimum bending stiffness is obtained.
The invention is described in greater detail in the following by way of an embodiment and with reference to the accompanying drawings, in which
Fig. 1 shows a machine design for making the paper according to the invention, and
Fig. 2 shows the Scott-bond value for different test conditions.
Fig. 1 shows a twin wire machine with the wires 1 and, respectively, 2. A first pulp suspension is supplied through a head box 3 and results in a web 5. In a corresponding way, a web 6 web 6 is formed by supplying a second pulp suspension through the head box 4. The binder according to the invention consisted of an intensely beaten papermaking pulp with a beating degree of about 6θ°SR and was sprayed between the two already formed layers through the nozzle 7. The amount of material applied was 5 g/m2. The material was applied in a concentration of about 1% . Each layer consisted of 75 g/m2 unbleached sulphate pulp beaten to 18 or 27°SR. After the layers had been combined in usual manner, a web 8 was obtained which subsequent to its pressing in a number of rolls 8,9 yielded the two-layer paper 11.
Sheets of the paper were dried off-machine partially freely and partially clamped in frames. The results were compared to application of starch in the same amount and only water. The diagram in Fig. 2 show-s the Scott-bond value (a measure of layer adhesion) for different test conditions. The figure shows the Scott-bond values MD (machine direction) at constant press conditions (50 + 60 + 70 KN/m pressure applied). Besides, two drying methods have been used. As can be seen, the Scott-bond increases substantially with said additions and shows an effect equal to or better than with starch addition.
The invention is not restricted to the embodiment shown, but can be varied within the scope of the invention idea.

Claims

Claims
1. A multi-layer paper containing between at least two of the layers a material acting as a binder for improving the adhesion therebetween, c h a r a c t e r i z e d i n that the material consists of a cellulose pulp with a beating degree exceeding 40ºSR, preferably exceeding 60°SR, in an amount of at maximum 10 g/m2, preferably at maximum 3 g/m2.
2. A multi-layer paper as defined in claim 1, c h a r a c t e r i z e d i n that the material consists of intensely beaten papermaking pulp, fine material separated from intensely beaten papermaking pulp and/or fine material, possibly containing fibres, from white water.
3. A method of making multi-layer paper according to the claims 1 - 2, by addition of a material acting as a binder, c h a r a c t e r i z e d i n that the material consists of a cellulose pulp with a beating degree exceeding 40ºSR, preferably exceeding 60ºSR, which after the wet forming of the layers is inserted between at least two of the layers in an amount of at maximum 10 g/m 2, preferably at maximum 3 g/m2, whereafter the layers are combined in a way known per se.
4. A method as defined in claim 3, c h a r a c t e r i z e d i n that the material consists of intensely beaten papermaking pulp. fine material separated from intensely beaten papermaking pulp and/or fine material, possibly containing fibres, from wite water.
EP19840901816 1983-04-11 1984-04-10 Multi-layer paper and method of making the same Withdrawn EP0172819A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8301973 1983-04-11
SE8301973A SE436140B (en) 1983-04-11 1983-04-11 MULTI-LAYER PAPER CONTAINING A MATERIAL ACTIVATED BETWEEN ATMINSTONE TWO OF THE LAYERS AND SEATING TO MAKE THE SAME MULTI-LAYER PAPER CONTAINING SOMETHING AS A BINDING MATERIAL

Publications (1)

Publication Number Publication Date
EP0172819A1 true EP0172819A1 (en) 1986-03-05

Family

ID=20350729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840901816 Withdrawn EP0172819A1 (en) 1983-04-11 1984-04-10 Multi-layer paper and method of making the same

Country Status (5)

Country Link
EP (1) EP0172819A1 (en)
BR (1) BR8407280A (en)
FI (1) FI851852A0 (en)
SE (1) SE436140B (en)
WO (1) WO1984004115A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4734336A (en) * 1986-10-02 1988-03-29 Xerox Corporation Twin ply papers for ink jet processes
DE10046171A1 (en) * 2000-09-19 2002-03-28 Voith Paper Patent Gmbh Method and device for applying a liquid or pasty application medium to a running material web
CN102899957B (en) * 2012-10-24 2015-01-07 浙江仙鹤特种纸有限公司 Production method for lining paper for cigarette

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1927865A1 (en) * 1969-05-31 1970-12-03 Erfurt & Sohn Friedrich Paper, especially for the production of wallpaper Password: two-ply wallpaper

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8404115A1 *

Also Published As

Publication number Publication date
SE8301973D0 (en) 1983-04-11
BR8407280A (en) 1986-01-21
SE436140B (en) 1984-11-12
SE8301973L (en) 1984-10-12
WO1984004115A1 (en) 1984-10-25
FI851852L (en) 1985-05-09
FI851852A0 (en) 1985-05-09

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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

17P Request for examination filed

Effective date: 19850919

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT DE FR GB SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SVENSKA TRAEFORSKNINGSINSTITUTET

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19861031

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HTUN, MYAT, THOUNG

Inventor name: LILJA, JONAS, EVERT

Inventor name: FELLERS, NILS, CHRISTER