US20040050517A1 - Method and device in a paper or board machine - Google Patents

Method and device in a paper or board machine Download PDF

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Publication number
US20040050517A1
US20040050517A1 US10/432,974 US43297403A US2004050517A1 US 20040050517 A1 US20040050517 A1 US 20040050517A1 US 43297403 A US43297403 A US 43297403A US 2004050517 A1 US2004050517 A1 US 2004050517A1
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United States
Prior art keywords
web
impingement
roll
calender
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.)
Abandoned
Application number
US10/432,974
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English (en)
Inventor
Kari Juppi
Antti Komulainen
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Assigned to METSO PAPER, INC. reassignment METSO PAPER, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JUPPI, KARI, KOMULAINEN, ANTTI
Publication of US20040050517A1 publication Critical patent/US20040050517A1/en
Assigned to VALMET TECHNOLOGIES, INC. reassignment VALMET TECHNOLOGIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: METSO PAPER, INC.
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • 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

Definitions

  • the invention relates to a method in a paper or board machine according to the preamble of claim 1.
  • the invention also relates to a device in a paper or board machine according to the preamble of claim 12.
  • twin-wire draw and/or single-wire draw is/are employed.
  • the groups of drying cylinders comprise two wires which press the web, one from above and the other one from below, against the heated cylinder surfaces.
  • the web has free and unsupported draws which are susceptible to fluttering, which may cause web breaks, in particular as the web is still relatively moist and, therefore, has a low strength.
  • each group of drying cylinders comprises only one drying wire on whose support the web runs through the entire group so that the drying wire presses the web against the heated cylinder surfaces of the drying cylinders and the web remains at the side of the outside curve of the reversing cylinders or rolls situated between the drying cylinders.
  • the drying cylinders are arranged outside the wire loop, and the reversing cylinders or rolls are arranged inside the loop.
  • the paper web may be constricted unevenly, and high differences in tension applied to the web may cause problems in achievement of a sufficiently uniform quality, in particular in relation to the cross-direction profile of the paper.
  • the device in a paper or board machine according to the invention is mainly characterized in that which is stated in the characterizing part of claim 12.
  • the concept according to the invention comprises a large-diameter impingement roll, an impingement arrangement associated therewith, a measuring beam, a profiling unit, a curl control apparatus located on the impingement roll, a suction roll located after the large impingement roll, and a belt calender located before a reel. After the belt calender, there is also a measuring beam, when needed, two measuring beams can also be used.
  • the web is transferred from a press section onto the large impingement roll as a supported draw and as of full width.
  • a vacuum is provided through a perforated roll shell to the surface of the roll, and the web is transferred by means of said vacuum onto the surface of a transfer fabric on the surface of the roll.
  • the web is transferred from the transfer fabric onto the fabric of the impingement roll (large vacuum roll) by means of the vacuum of the large vacuum roll.
  • the impingement or vacuum roll represents prior art known in itself as applied in the invention to a larger size.
  • the roll can thus be of the type known under the applicant's trademark VacRoll, in which the vacuum prevailing inside the roll acts to the same extent over the entire length of the circumference of the roll, and the interior of the roll has not been divided into separate chambers. It is also possible to use a conventional suction roll type, in which connection one or more boxes are arranged in the interior of the roll to divide the roll in the circumferential direction into chambers, sectors, in which vacuums of different magnitude can be used.
  • the diameter of the roll is over 2.5 m, even over 10 m, most appropriately 3-6 m. There may be one or more impingement drying groups one after the other.
  • the diameter of the roll is typically over 10 m. When several rolls are used in succession, their diameter is typically 3-6 m.
  • the web is dried on the large roll by the impingement technique, and a first measuring beam is located after the impingement proper, said measuring beam measuring moisture, basis weight, ash and the like from one side while the paper is against a wire. After the measuring beam, these is an impingement portion in which the moisture profile of the web is corrected and this is followed by correction of curl by moisturizing.
  • a moisturizing beam is advantageously provided with a housing and a suction blowing in order that moist water mist shall not escape into the surroundings.
  • the web is passed from the wire of the large impingement roll by means of a suction roll to a calender, which is formed by, for example, a smooth heated roll and a belt roll placed against it.
  • the web is brought as of full width to the calender roll, from the doctor of which it can be run down into a pulper.
  • the tail is passed from here to a reel as of full width or as a strip.
  • the device used for cutting the lead-in strip for instance, a spray cross cutter, is placed, when needed, for example, in connection with a transfer wire.
  • the arrangement in accordance with the invention provides a fully closed draw all the way to the calender, even through the paper machine, and full-width threading can be accomplished through the dryer section, even as far as the calender and the reel. Since the web is supported from the press section to impingement drying and advantageously further to the calender, the solids content of the paper need not be raised in the press section for runnability, but, instead, it is possible to run the desired solids content. Moreover, quality values can be selected as the determining factors in treatment once runnability problems have been solved.
  • impingement drying in accordance with the invention, steam is not needed, but impingement is most appropriately accomplished with gas, for example, natural gas.
  • the invention also allows a draw difference according to the desired quality to be used because runnability is not a decisive factor.
  • the moisture profile also need not be as precise when coming from the press section as in the prior art arrangements because, when using impingement, the web can be made dry at one go, in which connection no transfers are needed from one cylinder to the next, during which transfer the web having an uneven moisture profile adheres unevenly to the cylinder and causes runnability problems.
  • impingement drying and a calender have been integrated, whereby the resultant length of the paper machine is considerably shorter than that of the prior art dryer sections.
  • FIG. 1 is a schematic view of a prior art paper machine.
  • FIG. 2 is a schematic view of an advantageous application of the invention.
  • FIG. 3 is a schematic view of a second advantageous application of the invention, in which, as compared with the one shown in FIG. 2, the draw between a calender and a reel is closed and a support fabric does not run through the nip of the calender.
  • FIG. 4 is a schematic view of another advantageous application of the invention, in which, as compared with the application shown in FIG. 2, the draw of the web from a press to a dryer section is different.
  • FIG. 5 is a schematic view of an application of the invention which mainly corresponds to the one shown in FIG. 2 but a multi-nip calender is used as the calender.
  • FIG. 6 is a schematic view of an application of the invention in which a paper web is surface-sized, after-dried, calendered and reeled after a dryer section.
  • FIG. 7 is a schematic view of an application of the invention in which several impingement units are used and the web is passed from impingement drying through a multi-nip calender to a reel.
  • FIG. 8 is a schematic view of an application of the invention which mainly corresponds to the application shown in FIG. 7 but the draw from the calender to the reel is closed.
  • FIG. 9 is a schematic view of an application of the invention which mainly corresponds to the application shown in FIG. 6 but the draw from one drying unit to the next is closed.
  • FIG. 1 schematically shows one prior art application in which stock is fed from a headbox 100 to a wire section 200 , in which a gap former 250 is located and which is followed by a press section 300 having two press nips 350 .
  • a web W is passed from the press section 300 to a dryer section 400 to a first drying group 410 , which is arranged to be a so-called short group for runnability reasons, and which is followed by single-wire draw groups 450 in the application shown in the figure.
  • the web W is passed via a measuring beam 500 to be surface-sized on a sizer 600 , after which the web W is dried in an after-dryer section 700 in single-wire draw groups 750 .
  • the web W is calendered in a calender 800 and, finally, the web W is passed to a reel 900 , in which the web is reeled into rolls 950 .
  • FIGS. 2 - 8 Some advantageous exemplifying embodiments of the invention are illustrated in FIGS. 2 - 8 , and the same reference signs have been used of the corresponding parts, and the applications shown in them correspond to one another unless otherwise stated.
  • the basic concept of the invention comprises a large-diameter impingement roll 45 , impingement units 46 associated therewith, and a measuring beam 47 , a profiling unit 42 and a curl control apparatus 43 placed on the impingement roll 45 , a suction roll 51 placed after the large impingement roll 45 , and a belt calender 60 placed before a reel 70 . After the belt calender 60 there is also a measuring beam 69 .
  • a web W is passed from a press section 30 onto the large impingement roll 45 as a supported draw and as of full width.
  • the web W is dried by the impingement technique by means of the impingement units 46 , and the measuring beam 47 is located after the impingement proper, said measuring beam measuring moisture, basis weight, ash, etc. from one side while the paper W is against a wire 41 .
  • the measuring beam 47 is followed by the profiling unit, for example, an impingement device 42 or a steam box or equivalent, by means of which the moisture profile of the web W is corrected.
  • the web W is passed from the wire 41 of the large impingement roll 45 by means of a suction roll 51 and the transfer fabric 50 to the calender 60 , which, in the application shown in FIG. 2, is formed by the smooth heated roll 61 and the belt roll 62 placed against it.
  • the web is brought as of full width to the heatable calender roll 61 , from whose doctor 64 it can be run, when needed, down into a pulper 65 . From here, the web is passed to the reel 70 as of full width or as a strip.
  • a doctor 71 is arranged in connection with a reel drum of the reel 70 .
  • the run of the paper web W is as follows.
  • Stock is supplied from a headbox 10 into a gap between forming rolls 21 , 22 of a gap former 25 in a wire section 20 , from which gap it is passed between wires past dewatering devices of the gap former 25 further on support of a wire to a press section 30 .
  • the press section 30 comprises two presses 35 and 36 , and the web W is passed on an upper fabric of the first press 35 between the press rolls of the press 35 while supported by a lower fabric. From the lower fabric the web W is passed onto an upper fabric of the next press 36 and further between the upper fabric and a lower fabric between the press rolls of the press 36 .
  • the web W is passed from the lower fabric of the latter press 36 on a transfer fabric 39 and via a transfer suction roll 38 arranged in connection therewith as a supported draw without a free draw to the dryer section 40 onto the drying wire 41 , on whose support the web W is passed onto the large-diameter impingement drying cylinder 45 .
  • the impingement units 46 are arranged in connection with the impingement drying cylinder 45 .
  • the transfer fabric 39 is arranged before the impingement roll above the lower fabric 36 A of the last press nip 36 of the press section 30 , the web W being detached from the fabric 36 A of the press and transferred onto the surface of the transfer fabric 39 by means of the transfer suction roll 38 arranged in connection with the transfer fabric 39 .
  • the web W is transferred by means of the vacuum of the impingement roll 45 onto the wire 41 and further so as to run around the impingement roll 45 , which is a large-diameter vacuum roll provided with devices for producing a vacuum to the surface of the roll 45 .
  • FIG. 2 shows a large vacuum roll which is provided with several boxes 101 , 102 , 103 for using vacuums of different magnitude over the length of the circumference.
  • the first box 101 is typically a high vacuum zone which serves to eliminate the detrimental effects of the air carried into the closing nip on the surface of the roll and the fabric and to detach the web W efficiently from the surface of the transfer fabric 39 onto the fabric 41 .
  • the vacuum of the second box 102 assures that the web adheres to the surface of the fabric 41 in the area where the fabrics 39 and 41 are separated.
  • the third box 103 in which vacuum is typically lower than that of the preceding boxes, keeps the web W on the surface of the fabric 41 while the web runs around the large roll 45 .
  • the zone 101 typically begins before the point where the fabric 39 and the wire 41 running on the roll 45 meet and ends slightly after this point of meeting.
  • the zone 102 ends when the fabric 39 is substantially separated from the vicinity of the wire 41 and, at the same time, from the vicinity of the roll 45 most appropriately while guided by a wire guide roll, and the zone 103 ends roughly at the point where the wire 41 is detached from the roll 45 .
  • the exemplifying embodiment shown in FIG. 3 mainly corresponds to the exemplifying embodiment of the invention shown in FIG. 2.
  • the draw between the calender 60 and the reel 70 is arranged to be closed by means of a support fabric 63 , but differing from the application shown in FIG. 2, the support fabric 63 does not run through the calendering nip formed by calender rolls 61 , 62 , in which connection the calendering nip may be a hard nip or a soft nip.
  • a measurement device 69 is arranged above the support fabric 63 .
  • FIG. 3 shows an application in which there are no separate chambers inside the large roll but the same vacuum prevails over the entire length of the circumference of the roll in accordance with the principle of the roll marketed by the applicant under the trademark VacRoll.
  • the web W is kept on the upper fabric 36 Y of the last press nip 36 by means of a transfer suction roll 31 .
  • Vacuum boxes 37 and a suction roll 38 N are placed in connection with the fabric 36 Y to keep the web W in contact therewith.
  • the web W is transferred from the fabric 36 Y onto the impingement roll 45 in the same manner as from the transfer fabric 39 in the applications shown in FIGS. 2 and 3.
  • the paper web W is passed to the last press nip 36 of the press section 30 on support of the lower fabric 35 A of the press nip 35 , from which fabric the web W is transferred by means of a transfer suction roll 34 onto support of the upper press fabric 36 Y of the latter press nip 36 , the paper web W being passed to the latter press nip 36 while guided by said upper press fabric to remove water from the web W in said nip.
  • the web W is passed from the lower fabric 36 A of the latter nip 36 onto the upper fabric 36 Y by means of the transfer suction roll 31 and, as a closed draw, onto the drying wire 41 of the impingement drying cylinder 45 of the dryer section 40 .
  • the web W is kept on the upper fabric 36 Y by means of the vacuum boxes 37 and the suction roll 38 N, and from this fabric 36 Y the web W is passed further onto the drying wire 41 .
  • the paper web W is thus passed from the last press nip 36 of the press section as a fully closed draw by means of the upper fabric 36 Y onto the drying wire 41 of the dryer section, after which the paper web W is passed on the transfer fabric 50 to the calender 60 .
  • the transfer of the web from the press section 30 to the impingement roll 45 takes place as shown in FIG. 2 and, in the exemplifying embodiment shown in FIG. 5, the web W is passed after the impingement roll 45 from the drying wire 41 as a closed draw on a transfer fabric 50 to the top roll of a multi-nip calender 60 and further through the calender 60 to its bottom roll, in connection with which a doctor 67 is arranged. It is possible to run the web/lead-in strip from the bottom roll of the calender 60 down into a pulper from the doctor 67 placed on the bottom roll.
  • the draw between the calender 60 and the reel 70 is open and there is on the web W, for example, a device 77 of the airborne type supporting the run of the web W.
  • a doctor 71 is arranged in connection with the reel drum of the reel 70 .
  • the web W is passed after the first impingement roll 45 over the transfer suction roll 51 onto the transfer fabric 50 and from this as a free draw to a sizing/coating unit 80 , in which the web W is surface-sized/coated by means of applicator beams 93 A, 93 B, and after that forwards as a free draw, and the web W is passed on a suction roll 81 and on its transfer fabric 82 to a second impingement drying roll 45 ′, after which the web W is calendered on the calender 60 and passed to the reel 70 , as in FIGS. 2 and 4.
  • a sizing/coating unit 80 in which the web W is surface-sized/coated by means of applicator beams 93 A, 93 B, and after that forwards as a free draw
  • the web W is passed on a suction roll 81 and on its transfer fabric 82 to a second impingement drying roll 45 ′, after which the web W is calendered on the calender 60 and passed to the
  • the reference numerals used in the numbering of the latter impingement drying unit correspond to the reference numerals of the first impingement drying unit and the transfer fabric unit arranged in connection therewith, and the reference numerals of the latter unit are provided with an apostrophe for the sake of clarity.
  • the web W is surface-sized/coated on the sizing/coating unit 80 , which is followed by the drying formed by the impingement roll 45 ′ and impingement units 46 ′ and including a drying wire 41 ′.
  • a turning device 84 is placed after the coating station 80 .
  • the web W is passed to the calender 60 .
  • the web W is passed to the reel 70 , in which the paper web W is reeled into paper rolls.
  • FIGS. 7 and 8 there is a closed draw all the way to the calender 60 .
  • the web W is passed from the lower fabric 36 A of the latter press nip 36 of the press section 30 as a closed draw all the way to the calender 60 .
  • the exemplifying embodiment shown in FIG. 7 comprises a dryer section 40 which is formed of four impingement drying units, of which the last one corresponds to the impingement drying unit shown in the previous figures also in respect of additional equipment.
  • the first three impingement drying units comprise a large-diameter impingement drying roll 45 , as well as impingement hoods 46 and a drying wire 41 as well as alignment and guide rolls for the drying wire, arranged in connection therewith.
  • the first and the third impingement drying unit is arranged to be a so-called inverted impingement drying group and the second impingement drying unit is situated in the normal direction, and the web W meanders from a lower unit to an upper unit and further back to a lower unit.
  • the transfer from the impingement drying to the reel 70 corresponds to that described in connection with FIG. 5.
  • FIG. 8 also shows a multi-nip calender 60 , in which the draw between the calender 60 and the reel 70 is closed, so that in this application it is not possible to run the web down from the calender but it can be done either from the reel drum having a doctor 71 placed in connection therewith or from an auxiliary roll placed before the calender.
  • This exemplifying embodiment shown in FIG. 8 can be combined, for example, with the applications shown in FIGS. 2 and 3, thereby providing an arrangement in which the web can also be doctored from the lowermost or the second lowermost roll of the calender into the pulper 65 .
  • the application shown in FIG. 9 mainly corresponds to the one shown in FIG. 6 but the transfer from one drying unit to the other is closed.
  • the transfer from the dryer section 40 through the sizing/coating unit 80 to the calender 60 is closed, and full-width threading is also possible in it.
  • the web W is passed from the transfer fabric 50 through a closed nip 92 , which uses not a high load but a light load, and here the web is transferred from the transfer wire 50 onto a belt 95 .
  • the rolls of the nip may be normal wire guide rolls or they may be specially designed in their structure to withstand the special demands placed by nip operation.
  • the transfer fabric 95 is most appropriately a belt which is impervious to air, gas and liquid and which runs through the nip of the sizing/coating unit 80 .
  • the web is transferred from the transfer belt 95 by means of a transfer suction roll 97 onto a permeable transfer fabric 82 .
  • one size applicator beam 93 A has been moved into connection with the belt 95 before the transfer nip 92 and a size/coating is applied there to the surface of the belt to form a suitable film.
  • the web is passed from a suction roll 96 onto the drying wire 41 ′ of an after-dryer unit 40 ′.
  • the diameter of the roll is typically over 10 m. In the applications in which several impingement drying groups are used in succession, the diameter of the large-diameter roll is typically 3-6 m.
  • the large-diameter roll can comprise sectors acting by vacuums of different magnitude, and there may be two or more such sectors, or the same vacuum can act on the circumference of the roll over the entire length of the circumference.
  • the roll type in the different embodiments of the invention can differ from the examples shown in the figures.

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US10/432,974 2000-11-30 2001-11-29 Method and device in a paper or board machine Abandoned US20040050517A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20002628A FI20002628A0 (fi) 2000-11-30 2000-11-30 Menetelmä ja laite paperi- tai kartonkikoneessa
FI20002628 2000-11-30
PCT/FI2001/001040 WO2002044469A1 (en) 2000-11-30 2001-11-29 Method and device in a paper or board machine

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US20040050517A1 true US20040050517A1 (en) 2004-03-18

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Application Number Title Priority Date Filing Date
US10/432,974 Abandoned US20040050517A1 (en) 2000-11-30 2001-11-29 Method and device in a paper or board machine

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US (1) US20040050517A1 (de)
AU (1) AU2002220766A1 (de)
DE (1) DE10196931T1 (de)
FI (1) FI20002628A0 (de)
WO (1) WO2002044469A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050283994A1 (en) * 2004-06-28 2005-12-29 Wilhelm Mausser Device for continuous drying of a pulp web
WO2006018388A1 (de) 2004-08-16 2006-02-23 Voith Patent Gmbh Papiermaschine mit ein-nip presse
US20070089844A1 (en) * 2003-11-28 2007-04-26 Ulrich Begemann Paper machine
US9481777B2 (en) 2012-03-30 2016-11-01 The Procter & Gamble Company Method of dewatering in a continuous high internal phase emulsion foam forming process

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI120366B (fi) 2002-03-19 2009-09-30 Metso Paper Inc Menetelmä ja laitteisto käyttövoiman tuottamiseksi paperi- tai kartonkilaitoksessa
DE10358833A1 (de) * 2003-12-16 2005-07-21 Voith Paper Patent Gmbh Papiermaschine
DE102004007261A1 (de) * 2004-02-14 2005-09-15 Voith Paper Patent Gmbh Bahntrocknung
DE102004054886A1 (de) * 2004-11-12 2006-05-18 Voith Paper Patent Gmbh Trockenpartie
FI118387B (fi) * 2006-02-15 2007-10-31 Metso Paper Inc Menetelmä pintaliimatun kuiturainan, etenkin pintaliimatun paperi- tai kartonkirainan valmistuksen yhteydessä
DE102006015284A1 (de) * 2006-04-01 2007-10-04 Voith Patent Gmbh Vorrichtung zur Herstellung und Behandlung einer Faserstoffbahn
CN102997632B (zh) * 2012-11-19 2015-02-18 王兆进 一种具有射流系统、红外系统的节能干燥器

Citations (4)

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Publication number Priority date Publication date Assignee Title
US5389205A (en) * 1990-11-23 1995-02-14 Valmet Paper Machinery, Inc. Method for dewatering of a paper web by pressing using an extended nip shoe pre-press zone on the forming wire
US5495678A (en) * 1993-03-22 1996-03-05 Valmet Paper Machinery, Inc. Drying module and dryer sections that make use of same, in particular for a high-speed paper machine
US6428655B1 (en) * 1998-06-10 2002-08-06 Metso Paper, Inc. Integrated paper machine
US6447640B1 (en) * 2000-04-24 2002-09-10 Georgia-Pacific Corporation Impingement air dry process for making absorbent sheet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5389205A (en) * 1990-11-23 1995-02-14 Valmet Paper Machinery, Inc. Method for dewatering of a paper web by pressing using an extended nip shoe pre-press zone on the forming wire
US5495678A (en) * 1993-03-22 1996-03-05 Valmet Paper Machinery, Inc. Drying module and dryer sections that make use of same, in particular for a high-speed paper machine
US6428655B1 (en) * 1998-06-10 2002-08-06 Metso Paper, Inc. Integrated paper machine
US6447640B1 (en) * 2000-04-24 2002-09-10 Georgia-Pacific Corporation Impingement air dry process for making absorbent sheet

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070089844A1 (en) * 2003-11-28 2007-04-26 Ulrich Begemann Paper machine
US7871496B2 (en) 2003-11-28 2011-01-18 Voith Paper Patent Gmbh Paper machine
US8062479B2 (en) 2003-11-28 2011-11-22 Voith Paper Patent Gmbh Paper machine
US20050283994A1 (en) * 2004-06-28 2005-12-29 Wilhelm Mausser Device for continuous drying of a pulp web
US7690131B2 (en) * 2004-06-28 2010-04-06 Andritz Ag Device for continuous drying of a pulp web
WO2006018388A1 (de) 2004-08-16 2006-02-23 Voith Patent Gmbh Papiermaschine mit ein-nip presse
US20070251661A1 (en) * 2004-08-16 2007-11-01 Voith Patent Gmbh Paper Machine Comprising a Single Nip Press
US7776185B2 (en) 2004-08-16 2010-08-17 Voith Patent Gmbh Paper machine comprising a single nip press
US9481777B2 (en) 2012-03-30 2016-11-01 The Procter & Gamble Company Method of dewatering in a continuous high internal phase emulsion foam forming process
US9809693B2 (en) 2012-03-30 2017-11-07 The Procter & Gamble Company Method of dewatering in a continuous high internal phase emulsion foam forming process

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DE10196931T1 (de) 2003-10-16
AU2002220766A1 (en) 2002-06-11
WO2002044469A1 (en) 2002-06-06
FI20002628A0 (fi) 2000-11-30

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Pikulik 1.1 Approach Flow System The forming process is preceded by an approach flow system that receives the aqueous fiber suspension, or stock, and prepares it for the forming process. Fibres are produced using kraft process or other pulping/bleaching processes (see Bleaching of wood pulps) and the proportions of fibers from different sources are blended here. Drained water from the forming process, known as whitewater, contains useful fibrous material and is continuously recycled back into the stock. Screens and centrifugal cleaners in the approach flow system remove oversize and heavy contaminants from the pulp. Additives such as minerals, pigments and dyes are introduced to make particular grades of paper and paper board. Air bubbles may be removed from the pulp suspension. The mass concentration, or consistency, of the suspension is kept low to prevent fibre flocculation prior to forming and is usually adjusted to a value in the range of 0.5 to 1.5%.

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