WO1992001111A1 - Procede et dispositif de formation d'une bande de papier a couches multiples - Google Patents

Procede et dispositif de formation d'une bande de papier a couches multiples Download PDF

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Publication number
WO1992001111A1
WO1992001111A1 PCT/EP1991/001255 EP9101255W WO9201111A1 WO 1992001111 A1 WO1992001111 A1 WO 1992001111A1 EP 9101255 W EP9101255 W EP 9101255W WO 9201111 A1 WO9201111 A1 WO 9201111A1
Authority
WO
WIPO (PCT)
Prior art keywords
ply
forming
web
forming wire
wire
Prior art date
Application number
PCT/EP1991/001255
Other languages
English (en)
Inventor
James Blackledge
Nazzareno Salvai
James Arthur Turner
Original Assignee
Beloit Corporation
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 Beloit Corporation filed Critical Beloit Corporation
Priority to KR1019930700044A priority Critical patent/KR100191140B1/ko
Priority to JP3511632A priority patent/JPH0823117B2/ja
Priority to AU82139/91A priority patent/AU657691B2/en
Priority to BR919106629A priority patent/BR9106629A/pt
Priority to PL91297609A priority patent/PL167967B1/pl
Publication of WO1992001111A1 publication Critical patent/WO1992001111A1/fr
Priority to FI930080A priority patent/FI930080A0/fi

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • 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 multi-ply paper formation. More specifically, this invention relates to two-wire, multi-ply paper formation. Still more particularly, this invention relates to two-wire, multi- ply web formation wherein the outer ply to be ply-bonded to the base ply of the multi-ply web, has its surface dewatered essentially by wire tension and centrifugal force.
  • a relatively coarse base ply is first produced and a second, outer ply is produced to be brought into ply-bonding contact with the previously formed base ply.
  • the outer ply which is intended to form the outer surface of the printed container, such as a box, is formed of a finer grade of pulp stock so as to provide a smoother, higher quality surface.
  • dewatering was effected through both of its surfaces before the outer ply was brought into ply-bonding contact with the base ply of the paper web sheet.
  • both sides of the outer ply were dewatered positively, that is, they were dewatered by the application of sub-atmospheric air pressure directly to both surfaces to enhance the removal of water through both of the web surfaces.
  • the outer ply of a multi- ply web which is sometimes referred to as a "white top liner" is produced by dewatering through one side of the web using only centrifugal force and the force of the tension of the forming wire over the web.
  • the outer ply is formed in the general direction opposite to the direction of the traveling base ply to which it is ply bonded.
  • the generally upwardly facing surface of the top ply is dewatered by the tension of the upper, outer forming wire being concave downwardly held over the web which has been formed by the aqueous pulp stock slurry projected between the outer and inner forming wires.
  • one, or more, water collection devices such as water skimming slots, which may or may not be assisted by a vacuum, assist in removing water expressed inwardly of the outer forming wire.
  • the fines and fillers in the pulp stock slurry are thus exposed to sub-atmospheric (vacuum) pressure only within the lower forming wire in a generally concave downward direction for a relatively long distance. This affects the rate of water removal as well as permits the retention of a greater proportion of fines and fillers in the web, particularly the top surface of the web, due to the fact that migration of the fines and fillers through the lower surface of the web is hindered by the web fibers.
  • a feature and advantage of this invention is the provision of a white top liner in a multi-ply paper sheet, which sheet can be produced at improved speeds while exhibiting improved ply-bonding characteristics and a commercially desirable outer surface.
  • Figure 1 is a side-elevational view of the former showing a foil box within the first wire for substantially the length of the forming zone between the throat and the turning roll.
  • Figure 2 is a side-elevational view of the former showing a foil box followed by two suction boxes within the first, or lower, top ply forming wire.
  • Figure 3 is a side-elevation view, similar to that shown in Figure 1, but including a forming shoe within the lower top ply forming wire upstream of where the second, or upper, top ply forming wire comes into- co-running engagement with the web over the first forming wire.
  • a first, lower looped top ply forming wire 10 is shown looped about guide rolls 12, 12', 12'' and turning roll 14.
  • a foil box 16 Disposed within the first forming wire is a foil box 16 which has an outer contour defined by a plurality of foils 18 arranged to distend the first forming wire in a concave downwardly, or convex upwardly, shaped curve which defines a forming zone extending substantially between guide roll 12 and turning roll 14.
  • a looped second, upper forming wire 20 Disposed above the first, lower forming wire 10 is a looped second, upper forming wire 20 which is directed to travel in its looped path by guide rolls 22, 22' , 22" and 22" ' .
  • Guide rolls 12, 22 direct their respective forming wires 10, 20 into a throat 24 which converges near the leading edge of foil box 16. In the embodiment shown in Figure 1, the throat 24 extends to just after the beginning of foil box 16.
  • a headbox 34 is positioned to direct an aqueous slurry of stock fibers into the throat 24.
  • the headbox slice nozzle may be directed slightly toward one or the other of the forming wires.
  • Beneath the top ply former which is the designation for the apparatus just described, is a base ply forming wire 36 on which a base ply web W B has been formed upstream of the top ply former by other means.
  • a pivoted guide roll 38 wraps the base ply forming wire 36 around a portion of the periphery of the turning roll 14 beginning at a point over the trailing seal 30.
  • the top ply web W ⁇ is thus brought into co-running engagement with the base ply web W B , and ply-bonding occurs between the webs during this period of contact. Transfer of the composite, multi-ply paper sheet so formed to the base ply wire 36 is assured by the application of vacuum pressure in transfer box 40.
  • a source of sub-atmospheric pressure 42 is optionally linked to the foil box 16 to provide vacuum pressure to the lower side of the web being formed between the co-running forming wires 10, 20 over the foil blades 18 in the foil box. Water is removed from the inner side of the looped second forming wire by a drain 44, and water is removed from within the looped first forming wire by drain 46.
  • a first auto-slice 48a following the foil box, and a second auto-slice 48a' intermediate the two vacuum boxes 17a, 17a' .
  • Both auto-slices have a leading lip 33a, 33a' which is mounted in closely spaced adjacency, or non- pressure contact, with the inner side of looped forming wire 20a.
  • a headbox 34a discharges an aqueous stock fiber stream into the throat 24a formed between the forming wires 10a, 20a converging over guide rolls 12a, 22a.
  • Turning roll 14a which in this configuration is a plane surfaced roll with no vacuum chamber, brings the first forming wire around its surface and into co-running engagement with the base ply web W B being carried on base ply forming wire 36a.
  • a blade forming shoe 50 has been mounted within the first forming wire 10b upstream of the foil box 16b.
  • the second forming wire 20b is brought into engagement with the web over the first forming wire 10b just prior to the beginning of their co-running travel over the foil box 16b.
  • the first forming wire is guided onto the leading edge of foil box 16b by a guide roll 12b.
  • the headbox 34b discharges an aqueous slurry of stock onto the first forming wire over the surface of guide roll 12b.
  • the second vacuum box 17b effects the transfer of the newly formed top ply web W ⁇ onto the first forming wire which is directed into ply-bonding contact with the base ply web W B to form the multi-ply web W in a manner similar to that described in conjunction with Figure 2.
  • the cross-sectional profile of the first forming wire contour over blade forming shoe 50, or forming board may be substantially planar, or concave downward
  • the overall contour of the forming zone extending from before the leading edge of the forming shoe 50 to the trailing edge of vacuum box 17b' is concave downwardly/convex upwardly as shown which is similar to the configurations shown in Figures 1 and 2.
  • the vacuum pressure beneath forming wire 10b is zero or low, regardless of how it is induced, so as to promote better formation, and improved web properties, such as directional strength.
  • foil boxes 16a, 16b and vacuum boxes 17a, 17a' and 17b' are connected to a source of sub-atmospheric air pressure which are designated generally as 52a, 52a', 52b and 52b' .
  • the profile contours of the wire- contacting surfaces of the foil boxes and vacuum boxes is concave downwardly/convex upwardly. While the surface of the foil boxes is defined by a series of spaced foils which are parallel and spaced in the machine direction and which extend in the cross-machine direction, the contours of the vacuum boxes are usually comprised of an arcuate surface which is perforated, such as with holes
  • the headbox discharges an aqueous stock slurry into the throat between the co-running forming wires. Since the only application of sub-atmospheric air pressure to the fibrous stock slurry between the forming wires is provided by the foil box or vacuum boxes beneath the first forming wire 10, 10a, 10b, water is urged from the stock slurry outwardly and downwardly through the lower top ply web W ⁇ to within the looped first forming wire.
  • the headbox discharges the stock slurry onto the first forming wire and additional dewatering through the lower surface of the top ply web is effected by the blades 51 contacting the inner surface of the first forming wire over the forming shoe 50.
  • This is substantially similar to the water removal operation at the beginning of a conventional fourdrinier.
  • both upward (through the second forming wire) and downward (through the first forming wire) dewatering is effected, but the dewatering is controlled as described. More fines remain at or near the top surface of the top ply web for better ply bonding, and more fines and fibers remains in the whole top ply web due to the application of sub-atmospheric pressure on only the lower side through the first forming wire. In other words, the bottom of the top ply web is also of a higher quality. This promotes good top ply smoothness and printing properties in the composite multi-ply web W.
  • the throat can extend from upstream of the place where the top ply forming wires are guided to travel in substantially the same direction to where the wires converge.
  • the foil boxes, and forming shoe have been described as operated in conjunction with sub-atmospheric air pressure, it is contemplated that, under certain circumstances, they need not be so operated.
  • the terms web, sheet and paper include the term board.

Abstract

On forme une bande de papier à couches multiples en liant par mise en contact, une couche supérieure avec une couche inférieure (WB) se déplaçant sur une toile (36) de formation de ladite couche inférieure. La couche supérieure (WT) est formée entre deux toiles de formation à déplacement simultané (10, 20) situées dans une zone de formation à incurvation convexe vers le haut et concave vers le bas, pratiquement horizontale. L'essorage dans la zone de formation s'effectue par une pression d'air sous-atmosphérique appliquée uniquement sous la surface inférieure de la couche supérieure (WT) en formation. La surface supérieure de la couche supérieure (WT) est essorée uniquement par tension de la toile, la gravité et la force centrifuge que l'on obtient en faisant passer les toiles de formation à déplacement simultané (10, 20) dans la partie de la zone de formation convexe incurvée vers le haut. Ceci permet qu'une plus grande concentration de particules de pâte à papier reste dans la surface supérieure de la couche supérieure (WT) afin de créer une meilleure adhérence avec la couche inférieure (WB) quand les deux couches (WTWB) sont mises en contact et liées.
PCT/EP1991/001255 1990-07-10 1991-07-04 Procede et dispositif de formation d'une bande de papier a couches multiples WO1992001111A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1019930700044A KR100191140B1 (ko) 1990-07-10 1991-07-04 다층 웹 형성 장치 및 다층 웹의 형성 방법
JP3511632A JPH0823117B2 (ja) 1990-07-10 1991-07-04 多層ウエブの形成装置及び多層ウエブの形成方法
AU82139/91A AU657691B2 (en) 1990-07-10 1991-07-04 Multy-ply web former and method
BR919106629A BR9106629A (pt) 1990-07-10 1991-07-04 Processo e aparelho para formacao de uma tira de papel de pregas multiplas
PL91297609A PL167967B1 (pl) 1990-07-10 1991-07-04 Sposób i urzadzenie do formowania wielowarstwowej wstegi papierowej PL PL PL PL PL PL PL
FI930080A FI930080A0 (fi) 1990-07-10 1993-01-08 Formningsenhet foer flerlagrad bana samt foerfarande

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP90113178A EP0465698A1 (fr) 1990-07-10 1990-07-10 Procédé et dispositif de formation d'un papier à plusieurs couches
EP90113178.9 1990-07-10

Publications (1)

Publication Number Publication Date
WO1992001111A1 true WO1992001111A1 (fr) 1992-01-23

Family

ID=8204198

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1991/001255 WO1992001111A1 (fr) 1990-07-10 1991-07-04 Procede et dispositif de formation d'une bande de papier a couches multiples

Country Status (10)

Country Link
EP (1) EP0465698A1 (fr)
JP (1) JPH0823117B2 (fr)
KR (1) KR100191140B1 (fr)
AU (1) AU657691B2 (fr)
BR (1) BR9106629A (fr)
CA (1) CA2087013C (fr)
FI (1) FI930080A0 (fr)
PL (1) PL167967B1 (fr)
WO (1) WO1992001111A1 (fr)
ZA (1) ZA915311B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1042120B1 (fr) 1997-12-19 2004-09-29 E.I. Du Pont De Nemours And Company Structure intercouche pour verre feuillete
DE19903943A1 (de) * 1999-01-28 2000-08-03 Voith Sulzer Papiertech Patent Verfahren und Vorrichtung zum Bilden einer Faserstoffbahn

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2072936A5 (en) * 1969-12-06 1971-09-24 Walmsleys Bury Ltd Apparatus for fabricating laminated paper - or cardboard
FR2388936A1 (fr) * 1977-04-28 1978-11-24 Valmet Oy Procede de fabrication de carton a couches multiples et ensemble de formage de bande appliquant ce procede
US4153504A (en) * 1977-01-31 1979-05-08 Beloit Corporation Twin-wire fibrous web former and method
FR2418298A1 (fr) * 1978-02-24 1979-09-21 Voith Gmbh Machine a papier possedant une alimentation perfectionnee pour les fibres de la pate a papier

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5903086A (en) * 1986-04-30 1987-11-24 Beloit Corporation A web forming apparatus
GB8710428D0 (en) * 1987-05-01 1987-06-03 Beloit Corp Multi-ply web forming apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2072936A5 (en) * 1969-12-06 1971-09-24 Walmsleys Bury Ltd Apparatus for fabricating laminated paper - or cardboard
US4153504A (en) * 1977-01-31 1979-05-08 Beloit Corporation Twin-wire fibrous web former and method
FR2388936A1 (fr) * 1977-04-28 1978-11-24 Valmet Oy Procede de fabrication de carton a couches multiples et ensemble de formage de bande appliquant ce procede
FR2418298A1 (fr) * 1978-02-24 1979-09-21 Voith Gmbh Machine a papier possedant une alimentation perfectionnee pour les fibres de la pate a papier

Also Published As

Publication number Publication date
FI930080A (fi) 1993-01-08
EP0465698A1 (fr) 1992-01-15
JPH0823117B2 (ja) 1996-03-06
KR100191140B1 (ko) 1999-06-15
CA2087013C (fr) 1995-01-17
ZA915311B (en) 1992-04-29
BR9106629A (pt) 1993-06-01
JPH05507970A (ja) 1993-11-11
PL297609A1 (fr) 1992-07-13
AU8213991A (en) 1992-02-04
PL167967B1 (pl) 1995-12-30
FI930080A0 (fi) 1993-01-08
AU657691B2 (en) 1995-03-23

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