EP0706592B1 - Verfahren und vorrichtung zum herstellen beidseitig gestrichener papierbahnen - Google Patents

Verfahren und vorrichtung zum herstellen beidseitig gestrichener papierbahnen Download PDF

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Publication number
EP0706592B1
EP0706592B1 EP95919360A EP95919360A EP0706592B1 EP 0706592 B1 EP0706592 B1 EP 0706592B1 EP 95919360 A EP95919360 A EP 95919360A EP 95919360 A EP95919360 A EP 95919360A EP 0706592 B1 EP0706592 B1 EP 0706592B1
Authority
EP
European Patent Office
Prior art keywords
roller
application
coating
web
paper
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.)
Expired - Lifetime
Application number
EP95919360A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0706592A1 (de
Inventor
Stefan Reich
Bernd Riepenhausen
Martin Kustermann
Michael Trefz
Lars Winter
Irene Wedin
Anette Berg
Fredrik Aksnes
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.)
Voith Patent GmbH
SCA Graphic Sundsvall AB
Original Assignee
Voith Paper Patent GmbH
SCA Graphic Sundsvall AB
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 Voith Paper Patent GmbH, SCA Graphic Sundsvall AB filed Critical Voith Paper Patent GmbH
Publication of EP0706592A1 publication Critical patent/EP0706592A1/de
Application granted granted Critical
Publication of EP0706592B1 publication Critical patent/EP0706592B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • 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
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades

Definitions

  • the invention relates to a method for manufacturing on both sides coated paper webs, in particular so-called LWC papers, within a paper making machine according to the preamble of claim 1. Die The invention also relates to a device for performing of such a method, according to the preamble of claim 15.
  • a method with the in the preamble of claim 1 specified features is known from DE-A-43 02 437 A1.
  • a freshly made in a paper making machine Paper web coming out of a spout in a Press section is dewatered, i.e. is still raw and moist, is first in a dryer section Papermaking machine dried itself.
  • this publication is the one in the dryer section of the Paper machine dried paper web then first one downstream smoothing system supplied, which is a so-called soft nip calender with two double rolls. The smoothing in the smoothing unit takes place before you Coating the paper web instead. Coming from the calender, the paper web is then a first coating unit fed.
  • one side of the paper web becomes indirect by means of a first application roller, which with a first Counter roll forms a first application gap, with a Coated coating.
  • a first application roller which with a first Counter roll forms a first application gap, with a Coated coating.
  • the first coating of the Ergo paper web is only found after the previously mentioned soft nip calender instead of.
  • the coating unit has a metering element a squeegee with a grooved outer surface. Then the Paper web dried and a second coating unit fed, wherein the other side of the paper is also indirect is coated. After another drying process the finished, double-sided coated paper web is rolled up.
  • An application device is known from EP-A-0 454 643 A1 for indirect two-sided or direct one-sided Apply a coating slip to a running paper web.
  • this has Device two opposing application rollers, which form a nip between them through which the paper web to be coated runs through.
  • everyone Applicator roller is assigned to a chamber applicator that First spread on the rotating surface of the applies the respective application roller.
  • this device has a single Roller over which the paper web to be coated runs, and a chamber applicator assigned to this roller and the paper web, with which the coating slip directly onto the Paper web is applied.
  • the chamber commissioned works of these have two device variants on the in Direction of rotation of the (application) roller downstream side a “smooth" doctor rod with "big” Diameter against the running surface of the roller or the paper web is pressed to add a coating amount or set a profile of the applied coating medium.
  • the invention has for its object the known To further develop methods so that both sides coated paper webs with compared to previously essential higher smoothness and gloss values can be produced.
  • the task also includes one for implementation specify suitable device for this method.
  • the invention led to the realization that the use a known smooth doctor element for forming the Coating films on each of the applicator rollers with a smoothing of the paper web coated on both sides by means of at least one smoothing unit to much higher ones Smoothness and / or gloss values lead than before. presumably this surprisingly good result is achieved in that the use of a smooth doctor element compared to the conventional grooved squeegee, on the coating color exerts a higher shear effect, and that platelet-shaped pigment particles are aligned in such a way that they lie flat on the paper surface from the start. As a result, there is far less than after smoothing So far the tendency that the surface of the finished paper has a matt character.
  • the process steps of the process according to the invention are preferably controlled so that the surfaces of the finished, coated and smoothed paper at least is predominantly free of orange peel-like bumps.
  • doctor blade it is possible to use a doctor blade as Doctor element.
  • the use of a is preferred smooth squeegee because this creates the cross profile of the Coating is more controllable; in other words: it succeeds easily, permanently improved, in particular to get a uniform cross profile.
  • the rollers are each Coating unit arranged one above the other so that the Paper web essentially in the horizontal direction through the Order gap runs through.
  • An important part of the The present invention is therefore the rollers at least one of the two coating units in this way to arrange that the web is essentially bottom-up, preferably diagonally from bottom to top through the Order gap runs through.
  • the device according to the invention also differs from Subject of EP-A-0 596 365 A1, in which the web is inclined from runs down through the order gap.
  • the device according to the invention makes of the known possibility of use on each coating unit following drying device above the coating unit to arrange. This facilitates heat dissipation; because the predominantly upward heat-air flow will not hindered by the coating unit. It also avoids that dirty when cleaning the coating unit Cleaning waste water drips onto the drying device.
  • the material web 1 runs on leaving a dryer section T by a smoothing unit G and thence via web guide rollers 2 to 6 in the area of first coating station 8 a.
  • a smoothing device e.g. a large smoothing drying cylinder or "Yankee" cylinder
  • the first coating station 8 is a spreader roller 7 upstream, which the material web 1 from a in essential horizontal direction in an oblique direction redirects upward direction, after which the material web then by one trained in the coating station 8 Order gap runs through.
  • the coating station 8 includes one Applicator roller 10, one opposite and with it the backing roller 11 forming the application gap and a Applicator 13.
  • Fig. 1 is the applicator roller 10 preferably arranged obliquely below the counter roller 11, so that the material web 1 obliquely from bottom to top through the Order gap is running.
  • the arrangement may differ also be taken such that the web 1 essentially runs vertically from bottom to top through the application gap.
  • the position of the spreader roller 7 is variable, so that the Web before entering the application nip of the counter roller 11 wraps around something; i.e. the web 1 covers on the counter roller 11 a variable inlet angle e, which is between 0 and 15 ° can be.
  • Variant wraps around part of the application roller 10; this allows the penetration time of the coating medium in the Web can be increased.
  • the first coating station 8 is a web guide roller 12 downstream, the one running out of the order gap Material web from its diagonally upward direction deflects upward in a substantially vertical direction.
  • the web guide roller 12 touches the material web 1 on the not provided with a liquid medium (coating slip) Hinge side.
  • the position of the web guide roller 12 is also variable, so that the web 1 on the counter roll 1 variable outlet angle a that covers between 0 and 20 ° can be (see under half of Fig. 1).
  • the material web After leaving the web guide roller 12, the material web passes an infrared dryer 15 and then over two more Web guide rolls 16 and 17 through a hot air dryer 18 guided. Then the material web is over a Web guide roller 19 and a spreader roller 20 of a first Contact drying cylinder assembly 21 of known type supplied.
  • This arrangement has a number of e.g. four Drying cylinders to which the material web 1 in itself known manner by means of a so-called upper felt 22 and a bottom felt 23 is pressed. With dashed lines is indicated a variant in which instead of two above felted cylinders only a single cylinder felted above is provided.
  • the material web 1 runs over further web guide rollers 14, 14a, and an (again adjustable) spreader roller 24 in the Area of a second coating station 25.
  • This second piercing station 25 is in the present Embodiment compared to the first coating station 8 executed essentially in mirror image.
  • the second Coating station 25 comprises an application roller 10 ', a Counter roll 11 'and an applicator 13'. Again it directs the spreading roller 24 upstream of the coating station Material web from an essentially horizontal Inflow direction in an obliquely upward running direction um, in which the material web through the two rollers 10 ' and 11 'formed order gap.
  • Analogous to the first Coating station 8 is the second coating station 25 one Web guide roller 26 connected downstream from the press nip material web 1 running out of it obliquely upwards directed in a substantially vertical direction Direction of travel deflected upwards.
  • the material web After leaving the web guide roller 26, the material web passes 1 an infrared dryer 28. Then the Material web over a web guide roller 27, one without contact working deflection device 29 and a web guide roller 30 in introduced a hot air dryer 31. After passing the Hot air dryer 31 runs the material web 1 over a Spreader roller 32 into a second Contact drying cylinder assembly 33 which is similar Can be structured like the first Contact drying cylinder arrangement 21. However, is shown a space-saving arrangement with only two, approximately superimposed cylinders 34, with only one Felt 35 in front of the first cylinder via a suction guide roller 35a runs, there the felt 35 comes in for the first time with the web 1 Contact. Between the two cylinders 34, the web 1 temporarily without the felt 35 via a paper guide roller 1a to run.
  • a smoothing unit preferably a directly following on-line calender 60 follows.
  • An on-line calender has compared to an off-line calender (75, Fig. 7) et al. the advantage that in the smoothing The effort for the heat supply to the paper web is lower because the paper web before it enters the smoothing unit has relatively high temperature.
  • two two-roll calenders are provided, by which each have a relative heatable to at least 130 ° C hard metal roller 61 and a non-heatable counter roller 62 has a "relatively soft" coating. After that the finished paper web wound up in a conventional manner (in Fig. 1 not shown).
  • the application unit 13 or 13 ' the coating station 8 or 25 in the lower downward Quadrants of the application roller 10 arranged, that is approximately compared to the order gap.
  • the order work 13 can also approximately at the lower vertex of the roll surface to be ordered.
  • FIG two coating stations 8 and 25 to the respective Application roller 10 applied liquid film between the Application unit 13 or 13 'and the material web 1 from below visible and can be checked.
  • an applicator 13 is relative in one position to the applicator roller 10 shown the arrangement of Commissioned work 13 in the first coating station 8 in FIG. 1 equivalent.
  • the embodiment of the shown in Fig. 2 Commissioned work 13 works with a smooth roller doctor 36, the is mounted in an angled doctor bed 45.
  • the liquid medium is from a distribution channel 51 and through a feed gap 39 supplied under pressure to an application chamber 38 by the Roller doctor bed 45, the application roller 10 and a baffle bar 37 is limited.
  • the liquid from the application chamber 38 Medium over the roller doctor 36 on the applicator roller 10 in one desired line width applied.
  • Excess liquid Medium flows over the damming bar 37 (or through openings in the storage rail) and over the front wall 50 carrying it under Effect of gravity along a drain surface 40 in a drainage channel 41. Thanks to the angled doctor bed 45 can feed gap 39 and discharge surface 40 approximately radially to The lateral surface of the roller 10 run. This enables the Arrangement of the order work in the lower downward running Quadrants of the roller 10.
  • the application work 13 shown in Fig. 2 is with a known deflection compensation system provided the one Deflection of the beam 43 carrying the coating unit by means of a measuring system 52 detects and then a Deflection compensation using pressure pads 42 makes that between the bar 43 and an articulated in this received yoke 44 are arranged.
  • the application unit has a pressure hose 58 which extends over the entire width of the application work 13 extends and in contact with the bent doctor bed 45 stands.
  • the pressure hose 18 is supported by a pressure bar 59 acted on, which also runs continuously.
  • About the Spindle shafts 49 are distributed across the width of the application unit 13 arranged at one end with a handwheel 48 are provided and with their other end with the Pressure bar 59 are in operative connection.
  • the pressure hose 58, the pressure bar 59 and the adjusting spindle 49 which as flexible shafts or designed as cardan shafts a system with which the pressure of the doctor blade 36 against the Roller 10 variably adjusted over the length of the applicator can be to the cross profile of the on the roll surface to regulate the coating slip film formed.
  • FIG. 3 is another embodiment of a Commissioned work 13A shown that for a position in the lower upward running quadrant of the applicator roller 10 suitable is.
  • the application unit 13A also works with a smooth one Roller doctor blade 36.
  • the liquid medium now becomes approximately tangential to the roll jacket through the feed gap 39 'of the application chamber 38 'supplied by a conventional (essentially level) roller doctor bed 45 ', the applicator roller 10 and the Storage bar 37 'is limited. Excess liquid medium in turn flows over the baffle bar 37 'under the influence of Gravity along the drainage surface 40 into a drainage channel 41 from.
  • a deflection compensation system is also provided here, this is a deflection of the beam bearing the commissioned work 43 determines by means of a measuring system and then one Deflection compensation using pressure pads 42 makes that between the bar 43 and an articulated in this received yoke 44 are arranged.
  • FIG. 4 is another embodiment of a Commissioned work 13B shown that for a position in the lower upward quadrant of the applicator roll 10 'of the figure 1 is suitable.
  • This commissioned work comes with a Provide doctor blade 36a (instead of a doctor blade).
  • the Scraper blade 36a bounded together with a baffle 37 ' and with the application roller 10 'an application chamber 38'.
  • Liquid coating slip is in turn under pressure Order chamber fed, taking excess coating slip over the damming bar 37 'along a drain surface 40 into a Collecting channel 41 runs.
  • the commissioning work 13B shown in FIG. 4 is designed without a deflection compensation device.
  • the paper web 1 runs essentially vertically from bottom to top through the nips of the coating stations 8 and 25. After each coating station 8, 25, any drying station 68, 69, only shown symbolically, is provided.
  • the on-line calender comprises a total of four two-roll calenders, each with a hard and heatable roll 61 and each with a non-heatable "relatively soft" roll 62. Each roll type 61 or 62 is arranged alternately below and above , so that a symmetrical smoothing of the web 1 takes place.
  • FIG. 6 shows a variant in which the on-line calender 60 two three-roll calenders, each with a central heatable hard roller 61 and two “relatively soft” counter rollers 62 having.
  • a smoothing station 70 follows the smoothing unit 60.

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  • Paper (AREA)
  • Coating Apparatus (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP95919360A 1994-04-28 1995-04-28 Verfahren und vorrichtung zum herstellen beidseitig gestrichener papierbahnen Expired - Lifetime EP0706592B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4414949 1994-04-28
DE4414949A DE4414949A1 (de) 1994-04-28 1994-04-28 Vorrichtung zum Auftragen von mindestens einem flüssigen Medium auf eine laufende Materialbahn
PCT/EP1995/001627 WO1995030049A1 (de) 1994-04-28 1995-04-28 Verfahren und vorrichtung zum herstellen beidseitig gestrichener papierbahnen

Publications (2)

Publication Number Publication Date
EP0706592A1 EP0706592A1 (de) 1996-04-17
EP0706592B1 true EP0706592B1 (de) 2002-07-03

Family

ID=6516740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95919360A Expired - Lifetime EP0706592B1 (de) 1994-04-28 1995-04-28 Verfahren und vorrichtung zum herstellen beidseitig gestrichener papierbahnen

Country Status (9)

Country Link
US (1) US5685909A (pt)
EP (1) EP0706592B1 (pt)
JP (1) JPH08512368A (pt)
AT (1) ATE220143T1 (pt)
BR (1) BR9506237A (pt)
CA (1) CA2165974A1 (pt)
DE (2) DE4414949A1 (pt)
FI (1) FI107750B (pt)
WO (1) WO1995030049A1 (pt)

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EP0596365B1 (en) * 1992-11-03 1999-02-03 Valmet Corporation Method and apparatus for two-side coating of a thin printing paper web
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DE9314280U1 (de) * 1993-09-22 1994-01-20 Jagenberg Ag Vorrichtung zum Beschichten einer Papier- oder Kartonbahn
FI96338C (fi) * 1994-04-19 1996-06-10 Valmet Corp Menetelmä ja laitteisto painopaperirainan kaksipuoliseksi päällystämiseksi

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DE59510256D1 (de) 2002-08-08
ATE220143T1 (de) 2002-07-15
US5685909A (en) 1997-11-11
WO1995030049A1 (de) 1995-11-09
DE4414949A1 (de) 1995-11-02
EP0706592A1 (de) 1996-04-17
FI956281A (fi) 1996-01-24
FI107750B (fi) 2001-09-28
BR9506237A (pt) 1997-08-12
FI956281A0 (fi) 1995-12-27
JPH08512368A (ja) 1996-12-24
CA2165974A1 (en) 1995-11-09

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