EP1964970A2 - Procédé de fabrication d'une bande de papier, de carton ou autre matière fibreuse revêtue - Google Patents

Procédé de fabrication d'une bande de papier, de carton ou autre matière fibreuse revêtue Download PDF

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Publication number
EP1964970A2
EP1964970A2 EP07150127A EP07150127A EP1964970A2 EP 1964970 A2 EP1964970 A2 EP 1964970A2 EP 07150127 A EP07150127 A EP 07150127A EP 07150127 A EP07150127 A EP 07150127A EP 1964970 A2 EP1964970 A2 EP 1964970A2
Authority
EP
European Patent Office
Prior art keywords
web
coating
film coating
coating unit
coat
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Withdrawn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
EP07150127A
Other languages
German (de)
English (en)
Other versions
EP1964970A3 (fr
Inventor
Hai-Van Nguyen
Uwe Fröhlich
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
Original Assignee
Voith 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 Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1964970A2 publication Critical patent/EP1964970A2/fr
Publication of EP1964970A3 publication Critical patent/EP1964970A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/822—Paper comprising more than one coating superposed two superposed coatings, both being pigmented
    • 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
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type 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

Definitions

  • the coating is also only at the expense of complicated and long web tracks.
  • the object of the invention is therefore to provide an improved process for the production of coated papers, in particular wood-free papers, which does not have the disadvantages mentioned.
  • the object of the invention is achieved by a method according to the characterizing part of claim 1.
  • At least one side of the web is provided twice and indirectly with a coating medium, one web side being provided with a first film coat as precoat in a first film coating unit and a second film coat as top coat in a second film coating unit, wherein a ratio of the line weight of the first line to the second line (ie precoating the cover line on a web page) in the order of about 1.3 to 1.0 and a total stroke weight between 30 and 55g / m 2 set, and a basis weight (FbM) of Trajectory between 70 and 150 g / m 2 is achieved.
  • a ratio of the line weight of the first line to the second line ie precoating the cover line on a web page
  • FbM basis weight
  • the process is characterized by optimum runnability.
  • the track shows a high quality.
  • this other web side can either be directly fed with a knife coater, i. A blade applicator or Bladecoater or indirectly with a film coating unit (film / size press, Speedcoater / Speedsizer) are coated.
  • An alternative to the double coating of the other or second side of the sheet may be that the first line, ie the precoat, is applied in a direct manner with a knife coater and the second line, ie the top line, in an indirect manner with a film coating unit.
  • Another variant of the double coating of the other side of the web can consist of the reverse order of the types of coating. Accordingly, the first stroke, i. the precoat indirectly with a film coater and the second bar, i. the top coat, applied with a doctor blade (ie a blade applicator or Bladecoater) directly to the relevant web page.
  • a doctor blade ie a blade applicator or Bladecoater
  • indirect order is meant that the application medium is applied by means of a coating unit to an applicator roll from which the liquid to pasty medium is then transferred to a web side of the web to be coated.
  • an applicator roll forms with a second such applicator roll a nip, which passes through the web to be coated.
  • both web pages receive the order medium in this nip. If, for example, only one side of the web is to be coated, the applicator assigned to the other web side is left unused and, as a rule, swung away.
  • misting occurs at high web speeds or machine speeds, ie color misting after the nip, which should be prevented as far as possible. Therefore, it is provided within the scope of the invention that in each case such applicator rolls are used which have a large diameter.
  • the ideal diameters have proven to be more than 1300 mm in size.
  • the web is dried between the precoat and the top coat.
  • a contactless drying consisting of air and infrared dryers is sufficient.
  • One of the dryers can additionally be designed as a deflection device (Airturn).
  • the precoat is porous and is applied to the at least one web page a coating color, in which up to 50 parts of kaolin are mixed with an aspect ratio> 5, preferably> 10.
  • the kaolin used is in platelet form and is approximately hexagonal in shape.
  • the aspect ratio is the ratio between the length of the platelets and the thickness.
  • An alternative to the coating color may be that in the case of coating colors containing calcium carbonate, 10 to 30 parts of talc having an aspect ratio> 5, preferably> 10, are admixed.
  • a coating color which contains pigments with steep or narrow particle size distribution. Due to separated coarse and fine fractions gives a tighter, ie steeper distribution.
  • pigments are known, for example, under the trade name Covercarb 60 or Covercarb 75.
  • a coating color which contains kaolin with an aspect ratio> 5, preferably> 10 as the main component, in particular between 50 and 70 parts.
  • the solids content of the coating color is more than 63%, preferably more than 65%.
  • the maximum amount of solids that can be processed depends essentially on the pigment composition and other coating color components.
  • the coated web can finally be smoothed. This can be done with different types of calenders. It is possible that either each side of the web is treated individually and successively with a one-nip calender or both sides of the web are smoothed with a multi-pin calender.
  • the speed of the web-making machine is longer than 800 m / min, in particular more than 1200m / min, preferably more than 1600 m / min.
  • Advantages of the method according to the invention are the low investment costs, short possible machine lengths, reduction of web tearing and tearing tendency as well as good coverage and print quality.
  • the object of the invention is also achieved with a device according to claim 20.
  • a first film coating unit for a primer and a second film coating unit for a cover coat wherein the second film coating unit of the first film coating unit is arranged in the path of the web and wherein the ratio of the applied coating weights the two film coating units is about 1.3 to 1.0 and a total coating weight between 30 and 55 g / m 2 and a basis weight (FbM) of the web between 70 and 150 g / m 2 is achievable.
  • FIG. 1 is within a web-making machine 1, the known process steps or machine configurations only roughly schematically represented as a box and mean:
  • Web formation from a pulp mixture with a headbox 2 and a wire section 3, dewatering in a press section 4, drying in a drying section 6 consisting of drying cylinders 5 in order to dry the formed web 7 at least to a residual moisture content.
  • a first film coating unit 10 consisting of two together forming a Nip N applicator rollers 10.1 for a first indirectly applied film or primer 11a and 11b on both web pages 7a and 7b.
  • a first film coating unit 10 consisting of two together forming a Nip N applicator rollers 10.1 for a first indirectly applied film or primer 11a and 11b on both web pages 7a and 7b.
  • Application roller 10.1 assigned a coating unit 10.2, which applies the application medium on the surface of the applicator rolls.
  • the application medium is then dispensed simultaneously in the nip N to the web side 7a and 7b.
  • a second film coating unit 12 which has the same structure as the first one, is provided for a top coat 13a and / or 13b.
  • the ratio of the coating weights applied with both film coating units 10 and 12, or rather the ratio between the precoat 11a and top coat 13a or 11 bundle 13b, is about 1.3 to 1.0. Overall, a line weight between 30 and 55 g / m 2 and a basis weight (FbM) of the total web 7 between 70 and 150 g / m 2 is achieved.
  • a doctor blade applicator or a device called a blade applicator or a blade coater would also be possible. This possibility is not in the FIG. 1 shown.
  • the first film coating unit 10 and for the top coat 13b said Bladecoater could be used. This possibility is for the sake of simplicity and because the components are known in principle, not in the FIG. 1 shown.
  • the described applicator rollers 10.1 and 12.1 all have the same diameter.
  • the diameter should be more than 1300 mm. It is advantageous if a relatively hard rubber coating of at least 50 P & J is used (even for smaller diameters than 1300 mm). This will be the dreaded misting avoided and the web and components of the web-making machine 1 kept clean.
  • a contactless web guide unit 14 is provided between the pre-coat 11a and the top coat 13a, or between primer 11b and top coat 13b. It consists on the web page 7a of a so-called Airturn 14.1, which on the basis of its blown air the freshly painted web 7 continues on an air cushion or a thin layer of air and also deflects.
  • the web guide unit 14 also consists of downstream, above the web page 7a and below the web page 7b arranged infrared and / or air dryers 14.2, with which a predrying is performed.
  • the second film coating unit 12 a second contactless acting after-drying unit 15, again consisting of one of the web page 7a associated Airturn - here with 15.1- and both web pages 7a and 7b associated infrared and / or air dryers 15.2. It is followed by an existing drying cylinders after drying section 16, which is shown for reasons of simplification only in the form of a narrow box. Subsequently, the web is wound up with a reel 17.
  • a Nachglätt spur 18 is still provided. For this, either one-nip calender or a multi-pin calender or even a combined design into consideration.
  • FIG. 1 This smoothing or Satinage 18 is offline, so is carried out spatially separated from the papermaking. Therefore, this device is in the FIG. 1 stand alone in the upper right position.
  • FIG. 2 shows in principle the same procedure and the machine parts, as in FIG. 1 , however, here the smoother or calendering takes place online. Therefore, the main machine parts or devices are shown in this figure and only for orientation and provided with reference numerals.
  • FIG. 3 also shows the same procedure and the machine parts as in FIG. 1 However, the steps 2 to 8, so the paper making, starting from the headbox to Vorglättung offline. Thereafter, the web is rolled up with a reel 19, to be subsequently unwound again with a dispenser 20. Separated from the previous method, the now unrolled web 7 is as in FIG. 1 described twice coated with the film coating units 10 and 12. The final smoothing (or satinage) 18 takes place in the example chosen, as in FIG. 1 offline, but could also (not drawn) online, as in the FIG. 2 shown variant.
  • FIG. 4a shows a first variant in which both sides of the web 7a and 7b are coated at the same time.
  • a first film coating unit 10 and a second film coating unit 12 each consisting of two applicator rollers 10.1 and 12.1 forming a nip, the web is coated twice simultaneously.
  • each applicator roll 10.1 or 12.1 of a film coating unit 10 or 12 is associated with a coating unit 10.2 or 12.2, whereby on the top of the web 7a a precoat 11a and a top coat 13a is formed.
  • a precoat 11b and a top coat 13b are applied to the underside 7b of the web 7, thus achieving a total of four application layers or lines.
  • FIG. 4b shows that the one web side 7a, this is the top of the web as at FIG. 4a coated twice and indirectly with an applicator roller 10.1 and 12.1.
  • the second variant of the coating shown here indicates that the other side of the sheet 7b, which represents the underside, is likewise double-coated, only the first line or the pre-coat 11b is applied here in an indirect manner to the film coating unit 10.
  • the second stroke or the top coat 13b is here with a doctor blade (Blade applicator or Bladecoater) 21 applied in a direct manner.
  • Figure 4c shows in a third variant, carried out in reverse order coating the web page 7b.
  • this web page 7b is also double-coated by first applying a pre-coat 11b in a direct manner with a knife coater 21. This is followed by the second line, or the top coat 13b in an indirect manner with a film coating unit 12.
  • the coating is carried out in a direct manner with the doctor blade coating device 21 or indirectly with the film coating unit 10 or 12. Since these mentioned, various alternatives are possible in the FIG. 4d the possible order facilities are shown in brackets.
EP07150127A 2007-02-28 2007-12-19 Procédé de fabrication d'une bande de papier, de carton ou autre matière fibreuse revêtue Withdrawn EP1964970A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710009703 DE102007009703A1 (de) 2007-02-28 2007-02-28 Verfahren zur Herstellung einer beschichteten Papier-, Karton- oder anderen Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP1964970A2 true EP1964970A2 (fr) 2008-09-03
EP1964970A3 EP1964970A3 (fr) 2012-01-18

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EP07150127A Withdrawn EP1964970A3 (fr) 2007-02-28 2007-12-19 Procédé de fabrication d'une bande de papier, de carton ou autre matière fibreuse revêtue

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DE (1) DE102007009703A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008057795B4 (de) * 2008-11-17 2016-12-29 Hubertus Burkhart Verfahren zur Herstellung von Papier
DE202008016817U1 (de) 2008-12-19 2009-02-26 Voith Patent Gmbh Beschichtungsvorrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050089641A1 (en) 2001-12-10 2005-04-28 Stefan Fors Method and apparatus for making a multilayer coating

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545408C5 (de) * 1995-12-06 2004-01-22 Voith Sulzer Papiermaschinen Gmbh Verfahren zur Oberflächenveredelung einer Kartonbahn
DE102004041537A1 (de) * 2004-08-27 2006-03-02 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Herstellen einer gestrichenen LWC-Papierbahn

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050089641A1 (en) 2001-12-10 2005-04-28 Stefan Fors Method and apparatus for making a multilayer coating

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DE102007009703A1 (de) 2008-09-04
EP1964970A3 (fr) 2012-01-18

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