EP0102173A2 - Maschine zur Papierfabrikation - Google Patents

Maschine zur Papierfabrikation Download PDF

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Publication number
EP0102173A2
EP0102173A2 EP83304192A EP83304192A EP0102173A2 EP 0102173 A2 EP0102173 A2 EP 0102173A2 EP 83304192 A EP83304192 A EP 83304192A EP 83304192 A EP83304192 A EP 83304192A EP 0102173 A2 EP0102173 A2 EP 0102173A2
Authority
EP
European Patent Office
Prior art keywords
belt
paper
sheet
around
fibres
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Withdrawn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
EP83304192A
Other languages
English (en)
French (fr)
Other versions
EP0102173A3 (de
Inventor
Alan Mawson
Brian Edward Evans
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.)
Wiggins Teape Group Ltd
Original Assignee
Wiggins Teape Group 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 Wiggins Teape Group Ltd filed Critical Wiggins Teape Group Ltd
Publication of EP0102173A2 publication Critical patent/EP0102173A2/de
Publication of EP0102173A3 publication Critical patent/EP0102173A3/de
Withdrawn legal-status Critical Current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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/10—Wire-cloths
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts

Definitions

  • This invention relates to paper making machinery and in particular to foraminous elements for use in such machinery which support the paper sheet as it is drained and dried.
  • an aqueous dispersion of paper making fibres is initially drained on a Fourdrinier wire. After the paper sheet has acquired sufficient internal coherence to be self-supporting, it is lifted from the Fonrdrinier wire as it passes over the couch roll and is carried through a wet press section by absorbent press felts.
  • the wet press section consists of one or more pairs of opposed rolls which subject the sheet and supporting felts to nip pressure whereby moisture is driven from the sheet-and absorbed by the felts.
  • the partly dried sheet is then passed on further felts through a dryer section consisting of a substantial number of large rotating steam heated drying cylinders against which the sheet is held until the moisture content is reduced to that required in the finished sheet.
  • the dryer section accounts for a major proportion of the energy usage and physically constitutes 50% or more of the length of the paper machinc, it removes a relatively small proportion of the water from the sheet, as compared with the Fourdrinier wire and press section. Operating, capital and maintenance costs are therefore high in relation to the effectiveness of the dryer section.
  • the invention provides an endless permeable belt for releasing moisture from fibrous paper making dispersions or sheets formed therefrom, comprising a flexible, corrosion and stretch resistant sheet having a high tensile strength and formed from metallic fibres laid randomly in a sheet and bonded together.
  • a flexible, corrosion and stretch resistant sheet having a high tensile strength and formed from metallic fibres laid randomly in a sheet and bonded together.
  • the bones between the fibres are formed by sintering.
  • the invention provides a Fourdrinier paper machine having a press drying section incorporating a belt as above defined.
  • the invention provides a paper machine having a machine glazing cylinder and incorporating a belt as above defined, the belt being arranged so as to bear against the outer surface of a paper sheet being dried on the cylinder during movement of the paper sheet.around a substantial proportion of the circumference of the cylinder.
  • the invention provides a paper machine having a dryer section incorporating belts as above defined.
  • a method of making an endless permeable flexible corrosion and stretch resistant belt with a high tensile strength,for releasing moisture from fibrous paper making dispersions or sheets formed therefrom comprises the steps of dry forming a layer of the belt from corrosion resistant metal fibres, and supporting the so formed dry belt on a support, consolidating the metal fibres by sintering so as to form a web, and leading the thus formked web around a path which determines its length before returning it to join with the end of the first dry formed layer and subsequently applying a second and subsequent layers of metal fibres whilst moving the belt around the path until a belt of the required thickness is obtained.
  • the web is self supporting after it initially leaves the support.
  • a magazine may be provided in the path comprising adjustable rollers, adjustment of which determines the length of the belt.
  • Means may also be provided for controlling the thickness, substance i.e. grammage and deckle of the belt.
  • the permeable belt of the invention is preferably made from a metal such as stainless steel since, when used in a press drying context, it will be required to withstand temperatures of 100° to 150°C with a stretch of less than 1%.
  • the sheet from which the belt is made requires to be sufficiently flexible to conform to rolls in the region of 15 centimetres in diameter whilst having a tensile strength of about 40 to 60 Newtons per 15mm.
  • the random laid material of the invention has a smoothness of from 200 to 300 Bendsten (in paper terms). This is substantially smoother than the woven material from which Fourdrinier wires are convent onally made. Because of the absence of wire knuckles characteristic of Fourdrinier wires, the formation of a wire mark in the paper made using sheets according to the invention is avoided.
  • the sheet should have sufficient permeability to pass steam at a rate of at least 170 cubic metres per square metre per hour at atmospheric pressure.
  • the configuration shown consists of a sheet 1 formed from a mass of short stainless steel fibres 2 laid randomly, in a manner somewhat similar to cellulose fibres in paper, and bonded together by sintering.
  • a suitable material is sold under the Registered Trade Mark BEKIPOR, by N.V. Bekaert S.A. B 8550 Zwevegem Belgium.
  • the preferred grade is 10 BL 1 which has a steam permeability at atmospheric pressure of about 600 cubic metres per square metre per hour.
  • the press drying assembly of Figure 2 comprises two heated drying cylinders 10 and 11 rotatable about parallel axes 12 and 13 respectively.
  • the cylinders 10 and 11 may, for example, be heated by steam and are movable towards each other, as indicated by the arrows 14, to form a nip at 15.
  • the assembly shown also comprises two endless metallic. permeable belts 16 and 17 according to the invention.
  • a tensioning roll 18 From a tensioning roll 18 the element 16 is led around a lead in roll 25,.under a pressure applying roll 19, around the cylinders 10 and 11 and a second pressure applying roll 20, and back to the tensioning roll 18.
  • the belt 17 is led from a tensioning roll 21 around a guide roll 22. It is then taken around the cylinder 10, inside the belt 16, and around the cylinder 11 outside the belt 16. It is then led around the pressure applying roll 20 inside the belt 16 and then, via a second guide roll 23, back to the tensioning roll 21.
  • the paper sheet 24 to be press dried is fed into the assembly around the lead in roll 25 so as to be carried around the cylinder. 10 between the belts 16 and 17.
  • the cylinders 10 and 11 are maintained at a temperature of from 100° to 150°C so that the sheet 24 is heated substantially before entering the nip between the cylinder 10 and roll 19. Subsequently; the sheet is trapped between the belts 16 and 17 as it passes around the cylinders 10 and 11, optionally with nip pressure being applied between these cylinders.
  • water is released as vapour through the perforations in the belts 16 and 17. Due to the surface characteristics of these belts, "wire" marking occurs and both sides of the paper sheet exhibit.substantially the same surface characteristics.
  • the tension and pressure applied during passage around the cylinders 10 and 11 also ensures that the paper does not shrink as it dries.
  • the press drying arrangement of Figure 3 only utilizes one metallic permeable belt according to the invention.
  • the assembly shown comprises a drying cylinder, steam heated to between 100° to 150°C, 30 around which is led a permeable belt 31 according to the invention.
  • the belt 31 is held in engagement with the cylinder 30 by a lead in roll 32 and a lead out roll 33.
  • the return path of the belt 31 is constrained by guide rolls 34 and a tensioning roll 35.
  • Press rolls 36 A, B, C, D, E are arranged around the cylinder 30 so as to apply nip pressure against the cylinder as shown.
  • a paper sheet 37 to be dried is led around the roll 32 so as to lie between the permeable belt 31 and the cylinder 30.
  • pressure is applied by the pressure applying rolls 36 A to E and moisture released as vapour through the permeable belt 31.
  • the cylinder 30 may also be of substantial size, highly polished so as to form in M.G. or Yankee cylinder and the pressure applying rolls 36 dispensed with. This will result in the nroduction of machine glazed paper having a smoother reverse surface than is usual with such paper.
  • the press rolls 36A and 36B may also be optionally retained as an M.G. press.
  • FIG 4 shows a conventional paper machine dryer section having an upper bank of steam heated drying cylinders 40 and a lower bank of similar cylinders 41.
  • a permeable belt 42 in accordance with the invention is-guided by means of rolls 43 so as to wrap around the upwardly facing surfaces of the cylinders 41, whilst a tensioning device shown diagrammatically at 44, maintains tension in the belt.
  • a second permeable belt 45 in accordance with the invention is guided by rolls 46 and tensioned by tensioning device 47 so as to wrap around the lower surfaces of the cylinders 41.
  • a paper sheet 48 to be dried is fed from the wet press of the paper machine (not shown and not forming part of this invention) between the first cylinder 41 and the permeable belt 45 and then alternately around the cylinders 40 and 41. As the paper sheet passes around the cylinders 40 and 41 it is held firmly in contact therewith by the permeable belts 44 and 45. This both resists the tendency of the sheet to shrink as it dries whilst readily releasing water vapour through the permeable belts.
  • the sheet may be reeled up or led through a size press and a further similar- dryer section prior to being reeled up. Neither the size press nor reel up asembly form part of this invention.
  • Figure 5 shows a forming device 50 for a belt according to the invention.
  • the device 50 comprises a conveyor 51 onto which stainless steel fibres are dry laid at 52 and bonded at 53 during passage through the high pressure nip of heated sintering rolls 54..
  • the layer of fibres deposited at 52 is substantially thinner than is required in the belt when formed.
  • the-bonded sheet 55 is taken around guide rolls 56 to a length control assembly consisting of lead in and lead out rolls 57 and 58 between which spacing rolls 59 are located.
  • the spacing rolls 59 can be adjustted in the direction shown by the arrows 60 to vary the path length of the sheet and thus precisely control the overall length of the belt as it is formed.
  • the sheet is taken around two further guide rolls 61 and back to the conveyor 51, where a further layer of stainless steel fibres is deposited thereon.
  • the belt 56 continues to move around the path above described the thickness progressively builds up essentially as a spiral laminate with each new layer being sintered to the last in the nip of the rolls 54.
  • a-substance gauge 62 and a caliper gauge 63 are located which provide feedback control via lines 64 and 65 to control respectively the quantity of fibres laid at 52 and the pressure at the nip 53.
EP83304192A 1982-07-22 1983-07-19 Maschine zur Papierfabrikation Withdrawn EP0102173A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8221232 1982-07-22
GB8221232 1982-07-22

Publications (2)

Publication Number Publication Date
EP0102173A2 true EP0102173A2 (de) 1984-03-07
EP0102173A3 EP0102173A3 (de) 1984-08-08

Family

ID=10531844

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304192A Withdrawn EP0102173A3 (de) 1982-07-22 1983-07-19 Maschine zur Papierfabrikation

Country Status (7)

Country Link
EP (1) EP0102173A3 (de)
JP (1) JPS5930991A (de)
BR (1) BR8303856A (de)
DK (1) DK331483A (de)
ES (2) ES8503392A1 (de)
FI (1) FI832628A (de)
NO (1) NO832642L (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989002005A1 (en) * 1987-08-27 1989-03-09 Beloit Corporation An apparatus and method for removing fluid from a fibrous web
BE1008484A3 (nl) * 1994-06-23 1996-05-07 Bekaert Sa Nv Geconsolideerd poreus metaalvezelvlies.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2316818A (en) * 1940-04-10 1943-04-20 Internat Steel Wool Corp Woven metallic wool fabric
GB821690A (en) * 1955-03-03 1959-10-14 Armour Res Found High strength-variable porosity sintered metal fiber articles and method of making the same
GB889583A (en) * 1959-04-27 1962-02-21 Armour Res Found Improvements in or relating to the manufacture of fibre metal compacts
FR1601364A (de) * 1968-01-19 1970-08-17
DE2057063A1 (en) * 1970-11-20 1972-05-25 Wmf Wuerttemberg Metallwaren Metal felt making - with a revolving fibre spreading barrel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2316818A (en) * 1940-04-10 1943-04-20 Internat Steel Wool Corp Woven metallic wool fabric
GB821690A (en) * 1955-03-03 1959-10-14 Armour Res Found High strength-variable porosity sintered metal fiber articles and method of making the same
GB889583A (en) * 1959-04-27 1962-02-21 Armour Res Found Improvements in or relating to the manufacture of fibre metal compacts
FR1601364A (de) * 1968-01-19 1970-08-17
DE2057063A1 (en) * 1970-11-20 1972-05-25 Wmf Wuerttemberg Metallwaren Metal felt making - with a revolving fibre spreading barrel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989002005A1 (en) * 1987-08-27 1989-03-09 Beloit Corporation An apparatus and method for removing fluid from a fibrous web
BE1008484A3 (nl) * 1994-06-23 1996-05-07 Bekaert Sa Nv Geconsolideerd poreus metaalvezelvlies.

Also Published As

Publication number Publication date
ES8600706A1 (es) 1985-03-16
DK331483A (da) 1984-01-23
ES530234A0 (es) 1985-03-16
ES524246A0 (es) 1984-06-16
FI832628A0 (fi) 1983-07-19
DK331483D0 (da) 1983-07-19
FI832628A (fi) 1984-01-23
NO832642L (no) 1984-01-23
BR8303856A (pt) 1984-02-28
JPS5930991A (ja) 1984-02-18
EP0102173A3 (de) 1984-08-08
ES8503392A1 (es) 1984-06-16

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Inventor name: EVANS, BRIAN EDWARD

Inventor name: MAWSON, ALAN