WO2006024571A1 - Procede et dispositif servant a fabriquer une bande de papier couche leger - Google Patents

Procede et dispositif servant a fabriquer une bande de papier couche leger Download PDF

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Publication number
WO2006024571A1
WO2006024571A1 PCT/EP2005/053314 EP2005053314W WO2006024571A1 WO 2006024571 A1 WO2006024571 A1 WO 2006024571A1 EP 2005053314 W EP2005053314 W EP 2005053314W WO 2006024571 A1 WO2006024571 A1 WO 2006024571A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
smoothing
paper
top coat
coated
Prior art date
Application number
PCT/EP2005/053314
Other languages
German (de)
English (en)
Inventor
Rüdiger KURTZ
Michael Trefz
Oliver Rudolph
Franz-Josef Otto
Original Assignee
Voith Paper Patent Gmbh
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 filed Critical Voith Paper Patent Gmbh
Publication of WO2006024571A1 publication Critical patent/WO2006024571A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • 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
    • D21H23/72—Plural serial stages only
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • 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
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • 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
    • 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
    • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender

Definitions

  • the invention relates to a method for producing a coated, gravure-capable LWC paper web by brushing a raw paper with a liquid to pasty coating medium.
  • the direct method in which coating medium is applied to the moving paper web over its entire width For applying various devices are known, for example, nozzle applicators, in which a flat jet or individual sprays of coating medium are applied to the paper web. Downstream of the impingement point of the application medium, a doctor blade device is used to doctor off a yellow coat of the applied coating, while at the same time achieving equalization. Also, the indirect application is known, wherein the coating medium is first applied to a circumferential surface, for example, on the lateral surface of a cylinder from which the medium is discharged to the moving paper web. A paper web can be coated both one-sided and two-sided in a so-called film press.
  • Coated papers are widely used, for example as writing and printing paper or as magazine paper.
  • Magazine paper consists of LWC (light-weight-coated) paper, which has a basis weight of between 70 and 100 g / m 2 and is later to be printed by gravure printing.
  • the invention has for its object to provide an on-line method in which the disadvantages mentioned do not occur.
  • the surface of the stroke should be as level and smooth as possible, in particular with regard to the subsequent printing, preferably in the gravure printing process.
  • tears of the paper web are to be avoided. ⁇
  • the precoat is done with a so-called film press, that is a roller press.
  • the top coat can also be applied with the film press.
  • Vorzugstreichaggregate (Curtain Coater) for the top coat.
  • the step of pre-smoothing before the pre-coat and the step of intermediate smoothing after application of the pre-coat and before application of the top coat is a coating blade with its above-mentioned disadvantages as a cause of breaks and as a wear element. Further advantageous embodiment variants emerge from the subclaims.
  • the invention makes it possible for the first time to produce LWC paper in the on-line process and, moreover, also in a form suitable for deep printing.
  • FIGS. 1 to 5 show in each case a paper web in cross-section transverse to the running direction of the paper web, if appropriate with one or two layers of a line.
  • Figure 6 shows: the entire process flow in a schematic representation
  • FIG. 1 shows the base paper 1. It was produced on a paper machine which has at least three presses in its wet part. If less than three presses are present, at least one shoe press is present.
  • the base paper 1 shown here has a basis weight of 35 to 50 g / m 2 . Deviations are possible, especially upwards.
  • the paper according to FIG. 1 is initially untreated, as can be seen from the different surface topography O. Accordingly, it has a different sheet thickness, seen transversely to the direction, as shown here in dashed lines. It can be seen in the central region of the sectional view of a bottleneck, that is, a particularly small thickness d, while the two outer regions have a greater thickness D.
  • the area boundary lines are similar to sinusoids.
  • Figure 2 shows the same raw paper after performing the first treatment step, namely after passing through a smoothing device.
  • the smoothing serves a Vorglätten and at the same time a Calibrating the thickness.
  • the sinusoids are relatively uniform.
  • the pre-smoothing is carried out in a calender. This consists in the present case of two steel rollers, that is rollers in which at least coats are made of steel and are very smooth.
  • the calender has a device for sectionally adjusting the line force.
  • the average line pressure in the calender during pre-smoothing is between 30 and 40 kN / m. It can also be between 20 and 60 kN / m.
  • the next process step is illustrated in FIG.
  • the web 1 is now visible on both sides, also called “contour line”
  • the contour line is characterized by a uniform layer thickness and is applied with a film press
  • the line can be applied simultaneously on both sides or one after the other
  • the film press also known as “Speedcoater or Speedsizer”
  • Speedcoater or Speedsizer is a press with rollers that have a rubber cover or a polyurethane cover, and the hardness of the rubber cover is between 30 and 80 P & J , preferably between 50 and 70 P & J, when using a cover made of polyurethane, the hardness is between 20 to 50 P & J, preferably between 30 and 4O 5 PSiJ.
  • a liquid film of coating medium is first applied to the rollers, and from there to the relevant side of the paper web 1.
  • the solids concentration of the coating color is between 50 and 70%, preferably 60 to 68% by mass.
  • the coating color is composed of mineral pigments and synthetic binders, calcium carbonate pigments with a mean particle size of less than one micron are preferred, and calcium carbonate may contain further mineral constituents such as kaolin or titanium dioxide 50%.
  • the coating weight is an amount of 5 to 15 g / m 2 per side, preferably between 6 and 10 g / m 2 (dry wt.) In question.
  • the coating weight can best be adjusted with doctor bars of diameter 10-25 mm, preferably 14-18 mm.
  • the circular cylindrical smooth or grooved doctor rod runs at a speed of 100 to 500 U / min, preferably 150 to 300 U / min.
  • the precoat 2 is on both sides of the paper web 1. This will be discussed later.
  • the pre-coat is followed by a drying process.
  • the paper web 1 with the very moist layer 2 located thereon is first pre-dried without contact by means of infrared radiators. In this case, temperatures of at least 50 0 C are reached. This is followed by a drying process by means of non-contact hot air dryers.
  • the paper web is generally held in suspension on a levitation route by means of air jets and dried at the same time. This is not shown here.
  • a calender which may include a roller combination. So is a Hartnip combination consisting of two hard rolls, one of which is a hot roll, or two soft rolls, or a combination consisting of a hard / hot roll and a soft roll, or in the reverse case consisting of an upper soft roll possible with an engaged hard / hot roller. Both rolls may have a plastic cover, with a hardness between 85 and 96 ShD, preferably between 90 and 92 ShD.
  • the line pressure of the rollers of the calender stands between 100 and 600 kN / m, preferably between 100 and 300 kN / m.
  • a shoe calender can also be provided.
  • the gap length set with the pressure shoe can be between 20 and 250 mm. It is preferably between 40 and 70 mm.
  • the heated smoothing roller can be up to 300 ° C hot. For a uniform smoothing on both sides of the web, it is advantageous if a second shoe calender acts with the hot smoothing roll on the other side of the web.
  • the step of intermediate smoothing is again carried out by applying a cover layer.
  • the result is shown in FIG.
  • the paper web ⁇ fr? ⁇ Now carries the precoat 2, as well as the top coat 3.
  • the two layers - top coat and primer - are of uniform thickness and of great uniformity and smoothness of the surfaces.
  • the top coat according to FIG. 5 is in turn applied with a film press.
  • the same roll covers are used as for the precoat.
  • the diameter of the film press roll is also at least 1250 mm, as with larger diameters, the film splitting is less abrupt.
  • the weight of the top coat per side of the paper web 1 is between 5 and 15 g / m 2 , preferably 6 to 10 g / m 2 .
  • top coat 3 is followed, in turn, by predrying by means of IR radiation, followed by drying with hot air dryer, whereby the treatment in the online coating machine is shot down.
  • the water content of finished paper web is between 4 and 8%, preferably between 4 and 6% (absolute humidity).
  • the two rolls, preferably forming a hard smooth nip, serve to produce a uniform thickness profile of the raw paper, with a macro-roughness of greater than 1 mm;
  • B- priming by means of a film press ie with indirect order;
  • the order can also be carried out with a non-contact, so-called curtain coating unit (Curtain coatern), which is shown by way of example in dashed lines.
  • the order can be made per side also immediately after one another and without intermediate drying of the coating.
  • Vorhangstreichaggregaten a so-called 1: 1 order is possible. That is, without Abrakelelement only the amount of application medium is applied, which should also remain on the web.
  • G final smoothing or final finishing of the double-coated and dried paper preferably with a Janus calender, ie multi-roll soft calender as shown in FIG. 6, or with at least two shoe calenders each having a heated counter roll for each web side.
  • the final smoothing can also be carried out as conventionally with a so-called supercalender.
  • Combinations of heated cast steel rolls and plastic coated rolls are used.
  • the surface temperature of the steel rolls is between 80 and 200 0 C, preferably 120 to 160 0 C.
  • the line load in the individual nips is 200 to 450 N / mm, preferably 300 to 400 N / mm.
  • This final smoothing is done, as shown, either online immediately following the drying of the top coat.
  • the final smoothing in a separate, not connected to the paper machine smoothing done (offline), including, however, an additional winding and unwinding of the web is necessary.
  • Particularly advantageous for the final smoothing of the surface is a paper temperature greater than 50 0 C, preferably 60-80 ° C and a moisture content of the web of 5-10%, preferably 6-8%.
  • each coated paper page touches at least once a heated cast steel roller.
  • process steps or processing stations illustrated in FIGS. 1 to 6 need not necessarily follow one another directly. It can be interposed more action steps, for example. An intermediate humidification or an intermediate heating.

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  • Paper (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une bande de papier couché léger pour héliogravure. Le procédé selon l'invention consiste, dans une première étape (A), à procéder au lissage préalable de la surface d'une bande de papier brut continue (1) et à homogénéiser son profil d'épaisseur, dans une deuxième étape (B), à appliquer une couche préalable (2) sous forme de couche de contour sur un côté ou les deux côtés de la bande (1), dans une troisième étape (C), à sécher la bande (1) une première fois, dans une quatrième étape (D), à soumettre la bande (1) à un lissage intermédiaire, dans une cinquième étape (E), à appliquer une couche de finition sous forme de couche de contour sur un côté ou les deux côtés de la bande (1), dans une sixième étape (F), à sécher la bande (1) une seconde fois et, dans une septième et dernière étape (G), à lisser la bande (1).
PCT/EP2005/053314 2004-08-27 2005-07-12 Procede et dispositif servant a fabriquer une bande de papier couche leger WO2006024571A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410041537 DE102004041537A1 (de) 2004-08-27 2004-08-27 Verfahren und Vorrichtung zum Herstellen einer gestrichenen LWC-Papierbahn
DE102004041537.4 2004-08-27

Publications (1)

Publication Number Publication Date
WO2006024571A1 true WO2006024571A1 (fr) 2006-03-09

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PCT/EP2005/053314 WO2006024571A1 (fr) 2004-08-27 2005-07-12 Procede et dispositif servant a fabriquer une bande de papier couche leger

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DE (1) DE102004041537A1 (fr)
WO (1) WO2006024571A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110606396A (zh) * 2019-09-04 2019-12-24 佛山市捷信来包装材料有限公司 一种用于生产包装气柱袋的覆膜机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006044822A1 (de) * 2006-09-20 2008-04-03 Voith Patent Gmbh Verfahren zur Herstellung einer beschichteten Papier-, Karton- oder anderen Faserstoffbahn
DE102006044878A1 (de) * 2006-09-20 2008-04-03 Voith Patent Gmbh Verfahren zur Herstellung einer beschichteten Papier-, Karton- oder anderen Faserstoffbahn
DE102007009703A1 (de) * 2007-02-28 2008-09-04 Voith Patent Gmbh Verfahren zur Herstellung einer beschichteten Papier-, Karton- oder anderen Faserstoffbahn
DE102007009398A1 (de) * 2007-02-28 2008-09-04 Voith Patent Gmbh Verfahren zur Herstellung einer beschichteten Faserstoffbahn, insbesondere aus Papier oder Karton

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545408A1 (de) * 1995-12-06 1997-06-12 Voith Sulzer Papiermasch Gmbh Verfahren zur Oberflächenveredelung einer Kartonbahn
DE19715345A1 (de) * 1997-03-27 1998-10-01 Voith Sulzer Papiermasch Gmbh Verfahren zur Herstellung einer gestrichenen Warenbahn, insbesondere aus Papier oder Karton
WO2000070144A1 (fr) * 1999-05-12 2000-11-23 Metso Paper, Inc. Procede de fabrication de papier et ligne de machine a papier
WO2002103109A1 (fr) * 2001-06-18 2002-12-27 Metso Paper, Inc. Procede, machine a papier et papier de base pour la fabrication de papier impression couche leger (lwc) recouvert une seule fois

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545408A1 (de) * 1995-12-06 1997-06-12 Voith Sulzer Papiermasch Gmbh Verfahren zur Oberflächenveredelung einer Kartonbahn
DE19715345A1 (de) * 1997-03-27 1998-10-01 Voith Sulzer Papiermasch Gmbh Verfahren zur Herstellung einer gestrichenen Warenbahn, insbesondere aus Papier oder Karton
WO2000070144A1 (fr) * 1999-05-12 2000-11-23 Metso Paper, Inc. Procede de fabrication de papier et ligne de machine a papier
WO2002103109A1 (fr) * 2001-06-18 2002-12-27 Metso Paper, Inc. Procede, machine a papier et papier de base pour la fabrication de papier impression couche leger (lwc) recouvert une seule fois

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110606396A (zh) * 2019-09-04 2019-12-24 佛山市捷信来包装材料有限公司 一种用于生产包装气柱袋的覆膜机

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