EP0043289A2 - Procédé et dispositif pour fabriquer le papier et le carton - Google Patents

Procédé et dispositif pour fabriquer le papier et le carton Download PDF

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Publication number
EP0043289A2
EP0043289A2 EP81302997A EP81302997A EP0043289A2 EP 0043289 A2 EP0043289 A2 EP 0043289A2 EP 81302997 A EP81302997 A EP 81302997A EP 81302997 A EP81302997 A EP 81302997A EP 0043289 A2 EP0043289 A2 EP 0043289A2
Authority
EP
European Patent Office
Prior art keywords
web
drying
band
forming
press
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Withdrawn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
EP81302997A
Other languages
German (de)
English (en)
Other versions
EP0043289A3 (fr
Inventor
Brian William Attwood
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.)
BLACK-CLAWSON INTERNATIONAL Ltd
Original Assignee
BLACK-CLAWSON INTERNATIONAL Ltd
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 BLACK-CLAWSON INTERNATIONAL Ltd filed Critical BLACK-CLAWSON INTERNATIONAL Ltd
Publication of EP0043289A2 publication Critical patent/EP0043289A2/fr
Publication of EP0043289A3 publication Critical patent/EP0043289A3/fr
Withdrawn legal-status Critical Current

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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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • 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
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0281—Wet presses in combination with a dryer roll
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • 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
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/26—Special paper or cardboard manufactured by dry method; Apparatus or processes for forming webs by dry method from mainly short-fibre or particle material, e.g. paper pulp
    • D21H5/2678—Manufacture of layered products (assembly of superposed sheets), comprising the consolidation of such a structure
    • D21H5/2685—Manufacture of layered products (assembly of superposed sheets), comprising the consolidation of such a structure by dry method on to a web or on or between several preformed webs, at least one of which has been formed by another method, e.g. by wet method

Definitions

  • the present invention relates to the manufacture of paper and paperboard from wet-formed webs of fibrous cellulosic material and, more particularly, to the drying or dewatering of such webs.
  • drying is achieved by feeding the web over a large number of drying cylinders, which are usually steam heated, and the drying section of a paper-making machine may extend over many tens of metres.
  • rate of removal of water from the web during the drying stage is of the order of 14kgs per sq metre of effective drying surface per hour.
  • Such a drying rate is expensive and inefficient in terms of energy consumption, utilisation of space, and rate of production of the final web or sheet.
  • Objects of the present invention are to provide a method and apparatus for manufacturing paper and paperboard which produce improved drying or dewatering of a wet-formed web of fibrous cellulosic material, which reduce energy consumption, and which enable the construction of more compact paper-making machines occupying less space than hitherto known machines.
  • the invention consists in method of manufacturing paper or paperboard, including wet-forming a web of fibrous cellulosic material on a . travelling foraminous forming band and partially dewatering the web on the band, characterised by the steps of press-drying the partially dewatered web by advancing the web through one or more pressure nips provided between one or more rotating heated drying cylinders and one or more cooperating pressure rollers, and retaining the web in contact with the or each drying cylinder by means of the forming band for at least a part of the circumference of the or each cylinder.
  • the invention consists in apparatus for manufacturing paper or paperboard, including means for wet-forming a web of fibrous cellulosic material on a travelling foraminous forming band, and means for partially dewatering the web on said band, characterised by press-drying means disposed downstream of the partial dewatering means and comprising one or more rotatable heated drying cylinders and one or more cooperating pressure rollers defining one or more pressure nips, said forming band being guided through the pressure nip or nips and about at least a part of the circumference of the or each drying cylinder, vhereby the web is advanced through the pressure nip or nips and is retained in contact with at least a part of the circumference of the or each cylinder.
  • the web may be partially dewatered on the forming band by a vacuum dewatering stage to a solids content of 10-20% by weight in order to provide it with sufficient strength and integrity to withstand the treament in the press-drying stage.
  • a vacuum dewatering stage it may be fed through a plurality of pressure nips spaced around the drying cylinder whilst supported by the band, the linear pressure applied by these nips being in the range from 8.5-180kg/cm and the temperature of the cylinder being in the range from about 65-250 C.
  • the web is successively advanced through a plurality of pressure nips provided between a single set or series of drying cylinders and cooperating pressure rollers, whilst supported by the forming band, and the band retains the web pressed in contact with a part of the circumference of each cylinder of the series. With this arrangement, the same side of the web is pressed against each drying cylinder.
  • the web is alternately advanced about the drying cylinders and through the associated pressure nips of two sets of cylinders, the web being supported in contact with the cylinders of one set by the forming band and the cylinders of the other set by a second, separate, travelling foraminous band.
  • the invention enables a drying rate of better than 200kgs per sq metre of effective drying surface per hour to be achieved, thus providing a substantial overall reduction in energy consumption for drying the web and in the space required for drying compared with the drying or dewatering arrangements of hitherto known paper-making machines.
  • the fast drying at high temperatures and nip pressures achievable with the invention improves web characteristics, such as, strength and formation.
  • solid bleach cellulosic fibre stock is wet-laid from an explosion chamber flowbox 10, of the type described in British Patent No. 1548924 issued to St. Anne's Board Mill Company Limited, onto an endless travelling foraminous forming band or wire 11 to form a web, for example, of 120gms/sq m in weight.
  • a vacuum dewatering box 12 Disposed immediately beneath the explosion chamber outlet is a vacuum dewatering box 12 which reduces the water content of the stock, for example, from about 99% to about 90%.
  • a second vacuum dewatering box 13 downstream of the dewatering box 12 further reduces the water content of the web, for example, to about 85% by weight, that is, about 15% solids.
  • the latter may, for example, be 1.5 metres in diameter and be heated by steam at 2.1kg/sq cm pressure to give a surface temperature of about 115 0 C.
  • the pressure exerted on the web and band by the nips 15,16,17 may, for example, be arranged to increase progressively from a linear pressure of 0 kg/cm at nip 15 to 35kg/cm at nip 17. Over the parts of the circumference of the drying cylinder between the pressure nips, the web is retained in contact with the cylinder by the forming band 11.
  • the web and band are guided about the pressure roller 21 to a second series of similar pressure nips 22,23,24 provided between a second rotating heated drying cylinder 25 and cooperating pressure rollers 26,27,28 spaced about the circumference of the drying cylinder.
  • the forming band 11 retains the web in contact with the parts of the circumference of the drying cylinder 25 between the pressure nips 22,23,24.
  • the drying cylinder 25 may be similar to the cylinder 18 and likewise be heated to a surface temperature of about 115°C.
  • the pressure rollers 26,27,28 may be arranged to exert a linear pressure of 35kg/cm on the web and band passing through the associated pressure nips.
  • the resultant web 29 may have a solids content of, for example, 25-40% by weight. It is removed from the nip 24 and separated from the band via a take-off roll 30, whereupon it is fed to further drying equipment which may be in the form of press driers as described in British Patent No. 1424682 issued to St. Anne's Board Mill Company Limited or British Specification No. 2052586A assigned to the present assignee.
  • the band 11 is removed from the nip 24 about the pressure roller 28 and is returned to the head roller 31 adjacent the flowbox 10 via guide and tensioning rollers 32.
  • Fig. 2 illustrates a three-ply paper-making machine including a main forming and press-drying section of similar construction to the machine described with reference to Fig. 1.
  • cellulosic fibrous stocks are wet-laid from explosion chamber flowboxes 40,41,42 onto endless travelling foraminous forming bands 43,44,45, respectively, to form wet-laid plies on these forming bands.
  • the latter travel about vacuum forming or dewatering rollers 46,47,48, respectively, disposed immediately underneath the outlets from which the flowboxes 40,41,42.
  • These vacuum forming rollers reduce the water content, of the respective webs, for example, to about 85% by weight.
  • the web on the band 44 Downstream of the forming rollers 47,48, the web on the band 44,;is transferred onto the web on the band 45 by transfer rollers 49 and a vacuum box 50.
  • the band 44 is thereafter returned to the vacuum forming roller 47 via guide and tensioning rollers 51.
  • the resultant two-ply web supported on the band 45 is advanced about a roller 52 and is transferred from the band 45 onto the web deposited on the forming band 43 by transfer rollers 53 and a vacuum box 54.
  • the three-ply web together with the band 43 is advanced through a press-drying section comprising a series of pressure nips 55,56,57 spaced around the circumference of a rotating heated drying cylinder 58 and defined by pressure rollers 59,60,61 cooperating with this drying cylinder. Between the pressure nips the web is retained in contact with the drying cylinder by the forming band 43.
  • the drying cylinder 58 may, for example, be 1.5 metres in diameter and be steam heated to a surface temperature of about 115°C. Also, the linear pressure exerted by the nips may increase progressively from 0-35 kg/cm.
  • the resultant three-ply web 62 is removed from the nip 57 and separated from the band 43 by a take-off roller 63 and may, for example, have a solids content of 25-40% by weight. It is then fed to further drying equipment which may be in the form of press-driers as described in the aforementioned British Patent No.. 1424682 or British Specification No. 2052586A.
  • the -forming band 43 is returned to the vacuum forming roller 46 associated with the flowbox 40 via guide and tensioning rollers 64.
  • Fig. 3 illustrates a paper-making machine for forming a three-ply composite cellulosic web of both wet-laid and dry-laid cellulosic fibrous material and incorporates apparatus similar to that described with reference to Fig. 1 as the main wet-forming and press-drying sections.
  • wet cellulosic stock is laid from a first explosion chamber flowbox 70 onto a main endless foraminous forming band 71 to form a first ply which is immediately partially dewatered by a vacuum dewatering box 72 to a solids content, for example, of about 15% by weight.
  • Wet cellulosic stock is also wet-laid from a second explosion chamber flowbox 74 onto a second endless forming band 75 to form a second ply, which is immediately partially dewatered by a vacuum dewatering box 76 to a solids content, for example, of about 15% by weight, and dry cellulosic fibres are dry-laid from a distributor 77, which may be of the construction shown in either of British Patents Nos. 1424682 or 1516573 issued to St. Anne's Board Mill Company Limited, onto an endless forming band 78 to form a third, dry-laid ply. Deposition of this dry-laid ply is assisted by a suction box 79 disposed beneath the distributor 77.
  • the dry-laid ply is tranferred from the band 78 onto the wet-ply on the band 75 downstream of the flowbox 79 and a guide roller 80 by means of transfer rollers 81 and a vacuum box 82.
  • the band 78 is then returned to the distributor 77 via guide and tensioning rollers 83.
  • the composite two-ply web supported on the band 75 is advanced about guide roller 84 and is transferred onto the web on the band 71 by means of transfer rollers 85 and a vacuum box 86 to form a three-ply web which may, for example, be about 250gms/sq m in weight.
  • the three-ply web thus supported on the band 71 which may, for example, travel at a speed of 50 metres/min, is press-dried by advancing it through pressure nips 87-91 spaced about the circumferences of two successive drying cylinders 92,93.
  • the construction of this press-drying section is similar to that of Fig. 1, and between the pressure nips the web is retained in contact with the associated drying cylinders 92,93 by the band 71.
  • the drying cylinder 92 may, for example, have a diameter of 1.5 metres and be steam heated to give a surface temperature of 130°C.
  • the linear pressure exerted by the pressure nips associated with the cylinder 92 may be arranged to increase progressively from 0-35kgs/cm.
  • the three-ply web leaving the nip 89 has a moisture content of about 75%.
  • the drying cylinder 93 may, for example, be heated to a temperature of 110°C for further drying of the web to a moisture content of about 70%.
  • the web 94 is removed from the final nip 91 and separated from the band 71 via a take-off roller 95 for further drying, as required.
  • the forming band 71 is returned to the head roller 96 via guide and tensioning rollers 97.
  • a further eight pressure nips on two drying cylinders (not shown) heated to similar temperatures and pressures may be disposed downstream of the take-off roller 95 to reduce the moisture content of the web, for example, to about 15%.
  • a further vet-laid web may be produced using an explosion chamber flowbox instead of the dry-laying distributor 77.
  • systems such as foam-forming or high consistency forming may be used.
  • Fig. 4 illustrates a paper-making machine according to the invention in which opposite sides of the web are successively pressed against drying cylinders during the press-drying stage.
  • cellulosic fibrous stock is wet-laid from an explosion chamber flowbox 100 onto an endless travelling foraminous forming band 101 to form a web of cellulosic fibrous material.
  • a vacuum dewatering box 102 and a second vacuum dewatering box 103 Disposed immediately beneath the explosion chamber outlet is a vacuum dewatering box 102 and a second vacuum dewatering box 103, is disposed downstream thereof for futher reducing the water content of the web before it is advanced to the press-drying section.
  • the forming band 101 Downstream of the box 103, the forming band 101 is advanced through a series of pressure nips 104-112 spaced about the circumference of a first set of three rotating heated drying cylinders 113,114,115 similarly to the machine illustrated in Fig. 1.
  • the band 101 Upon leaving the final pressure nip 112, the band 101 is guided about the associated pressure roller and returned to the head roller 117 via guide and tensioning rollers 118.
  • the press-drying section also includes a second set of two rotating heated drying cylinders 119,120, each of which is provided with two pressure nips 121,122 formed by cooperating pressure rollers 123,124 and a separate endless foraminous backing band 125 which is fed through the nips 121,122 and about the cylinders 119,120 between the nips. Between the cylinders 119,120 the band 125 is guided by a guide roller 126.
  • the web 127 supported on the band 101 is advanced through the pressure nips 104,105,106 spaced about the drying cylinder 113 and, upon leaving the nip 106, the web is separated from the forming band 101 and is fed to the drying cylinder 119 where it is advanced through the associated pressure nips 121,122 and is supported on the cylinder 119 between the nips by the backing band 125.
  • the web After passing through the pressure nip 122,on cylinder 119, the web is separated from the backing band 125 and is fed to the drying cylinder 114, where it is again supported by the band 101 during travel through the pressure nips 107,108,109, and so on.
  • the web 127 is alternately advanced about the drying cylinders of the two sets until it is eventually removed from the final nip 112 on the drying cylinder 115 and separated from the band 101 via a take-off roller 128 for further drying or dewatering treatment, as required.
  • both sides of the web are pressed against.drying cylinders during the press-drying process.
  • the web is retained in contact with each cylinder, between the associated pressure nips, by the associated band 101,125 but is unsupported in its travel between successive drying cylinders.
  • These free runs of the web between successive drying cylinders which may, for example, be two metres or more in length, facilitate evaporation from the web 127 and reduce delamination problems.
  • Nip pressures and temperatures are typically similar to those described with reference to Fig. 1, but can be varied in accordance with individual web requirements.
  • This invention provides a single dewatering system with high dewatering capacity.
  • the web produced by the invention can exhibit essentially square characteristics that is, its strength and stiffness in the machine direction is substantially in a 1:1 ratio with the strength and stiffness in the cross-machine direction. Subsequent press-drying can result in the web characteristics described in the aforementioned British patent No. 1424682.
  • a further advantage of the invention is that strength can be developed in the web from various fibrous furnishes having little previous mechanical treatment, such as, refining.
  • the number of pressure rollers associated with an individual drying cylinder may be increased to four, five or even six and the range of nip pressures may extend up to 180kgs/cm.
  • the temperature of the drying cylinders may be varied from 65-150 C depending on the furnishes provided and the desired characteristics of the final web.
EP81302997A 1980-07-02 1981-07-01 Procédé et dispositif pour fabriquer le papier et le carton Withdrawn EP0043289A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8021673 1980-07-02
GB8021673 1980-07-02

Publications (2)

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EP0043289A2 true EP0043289A2 (fr) 1982-01-06
EP0043289A3 EP0043289A3 (fr) 1982-01-20

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ID=10514478

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EP81302997A Withdrawn EP0043289A3 (fr) 1980-07-02 1981-07-01 Procédé et dispositif pour fabriquer le papier et le carton

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EP (1) EP0043289A3 (fr)
JP (1) JPS5739296A (fr)
FI (1) FI812060L (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0346659A2 (fr) * 1988-06-13 1989-12-20 Appleton Mills Machine à papier dans laquelle le papier est supporté dans la zone de passage entre les sections de pressage et de séchage
EP0355873A1 (fr) * 1988-08-17 1990-02-28 Daniel Garcia Pastor Procédé de séchage mécanique pour la fabrication du papier
US4919759A (en) * 1987-01-23 1990-04-24 Valmet Paper Machinery Inc. Control of detachment of a paper web from a roll using heat
WO1991001407A1 (fr) * 1989-07-20 1991-02-07 Pulp And Paper Research Institute Of Canada Procede et appareil de fabrication de papiers lisses et satines
DE19654200A1 (de) * 1996-12-23 1998-06-25 Voith Sulzer Papiermasch Gmbh Naßpresse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0660377B2 (ja) * 1987-12-10 1994-08-10 株式会社神戸製鋼所 加工用合金化溶融亜鉛めっき鋼板の製造方法
JPH0241488A (ja) * 1988-07-26 1990-02-09 Ishikawajima Harima Heavy Ind Co Ltd 高濃度抄紙用ドライヤ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE239933C (fr) *
GB720165A (en) * 1950-09-26 1954-12-15 Joseph Winterburn Improvements in or relating to paper making machines
US3041235A (en) * 1958-02-12 1962-06-26 Huyck Corp Papermaking machine
GB1073063A (en) * 1964-04-13 1967-06-21 Procter & Gamble Bulky paper product and process for its manufacture
DE2437611A1 (de) * 1974-08-05 1976-02-26 Basf Ag Verfahren und vorrichtung zur herstellung von nassvliesen
GB1428401A (en) * 1972-02-23 1976-03-17 Walmsleys Bury Ld Board- or paper-making process and machine
DE2721146A1 (de) * 1977-05-11 1978-11-16 Schmidt Erwepa Maschf Papiermaschine, insbesondere zur herstellung von tissue-papier
GB2052586A (en) * 1979-05-19 1981-01-28 St Annes Board Mill Co Ltd Drying paper

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE239933C (fr) *
GB720165A (en) * 1950-09-26 1954-12-15 Joseph Winterburn Improvements in or relating to paper making machines
US3041235A (en) * 1958-02-12 1962-06-26 Huyck Corp Papermaking machine
GB1073063A (en) * 1964-04-13 1967-06-21 Procter & Gamble Bulky paper product and process for its manufacture
GB1428401A (en) * 1972-02-23 1976-03-17 Walmsleys Bury Ld Board- or paper-making process and machine
DE2437611A1 (de) * 1974-08-05 1976-02-26 Basf Ag Verfahren und vorrichtung zur herstellung von nassvliesen
DE2721146A1 (de) * 1977-05-11 1978-11-16 Schmidt Erwepa Maschf Papiermaschine, insbesondere zur herstellung von tissue-papier
GB2052586A (en) * 1979-05-19 1981-01-28 St Annes Board Mill Co Ltd Drying paper

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4919759A (en) * 1987-01-23 1990-04-24 Valmet Paper Machinery Inc. Control of detachment of a paper web from a roll using heat
EP0346659A2 (fr) * 1988-06-13 1989-12-20 Appleton Mills Machine à papier dans laquelle le papier est supporté dans la zone de passage entre les sections de pressage et de séchage
EP0346659A3 (fr) * 1988-06-13 1991-05-08 Appleton Mills Machine à papier dans laquelle le papier est supporté dans la zone de passage entre les sections de pressage et de séchage
EP0355873A1 (fr) * 1988-08-17 1990-02-28 Daniel Garcia Pastor Procédé de séchage mécanique pour la fabrication du papier
WO1991001407A1 (fr) * 1989-07-20 1991-02-07 Pulp And Paper Research Institute Of Canada Procede et appareil de fabrication de papiers lisses et satines
DE19654200A1 (de) * 1996-12-23 1998-06-25 Voith Sulzer Papiermasch Gmbh Naßpresse
US6221214B1 (en) 1996-12-23 2001-04-24 Voith Sulzer Papiermaschinen Gmbh Wet press and method for treating a fibrous material web

Also Published As

Publication number Publication date
EP0043289A3 (fr) 1982-01-20
FI812060L (fi) 1982-01-03
JPS5739296A (en) 1982-03-04

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