EP0731213A2 - Verfahren und Anlage zum Behandeln von Streichfarbe beim Auftrag auf eine Papier-Bahn - Google Patents

Verfahren und Anlage zum Behandeln von Streichfarbe beim Auftrag auf eine Papier-Bahn Download PDF

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Publication number
EP0731213A2
EP0731213A2 EP96103246A EP96103246A EP0731213A2 EP 0731213 A2 EP0731213 A2 EP 0731213A2 EP 96103246 A EP96103246 A EP 96103246A EP 96103246 A EP96103246 A EP 96103246A EP 0731213 A2 EP0731213 A2 EP 0731213A2
Authority
EP
European Patent Office
Prior art keywords
coating color
vacuum
line
mixing container
paper web
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Withdrawn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
EP96103246A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0731213A3 (enrdf_load_stackoverflow
Inventor
Hans Wetzel
Peter Illing
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.)
Draiswerke GmbH
Original Assignee
Draiswerke 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 Draiswerke GmbH filed Critical Draiswerke GmbH
Publication of EP0731213A2 publication Critical patent/EP0731213A2/de
Publication of EP0731213A3 publication Critical patent/EP0731213A3/xx
Withdrawn legal-status Critical Current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
    • 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
    • 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

Definitions

  • the invention relates to a method for treating coating color when applied to a paper web and a system for carrying out this method.
  • the coating color is stored in one or more large stirred containers with a vertical agitator axis, with stirring and fed in excess to a coating color application device while passing through filters.
  • the excess of coating color is fed back to the reservoir.
  • 25 to 40 times the amount of the coating color required for coating (line application) is applied to the paper web. This huge excess of coating color must be wiped off the paper web again using the doctor blade.
  • the invention is therefore based on the object of providing a method and a system in which problems arising from the air in the coating color do not occur.
  • the essence of the invention is that the coating ink is stirred relatively slowly after being returned from the application device in a gas-tight container and is thereby exposed to a partial vacuum.
  • the system shown in the drawing has a mixer 1 in which a coating color for coated papers is continuously produced from numerous components by mixing. This finished coating color is fed via a line 2 to a vacuum mixing container 3.
  • This consists of a pressure-resistant and gas-tight, horizontally arranged drum 4, in which a mixer 6, which can be driven by a motor 5, is arranged centrally.
  • a vacuum line 9 opens into the upper area of this vacuum attachment 7, via which the interior 8 of the drum 4 can be subjected to a partial vacuum.
  • the vacuum pump 10 is driven by a motor 11.
  • a flow line 12 opens out, through which the coating color is conveyed by means of a feed pump 13 arranged in it through a filter 14 to a coating color application device 15. From there, coating slip is conveyed back into the drum 4 through a return line 16.
  • paper particles contained in the coating color for example paper fibers, and reagglomerates are separated from the coating color, so that it reaches the application device 15 in an uncontaminated state.
  • This application device 15 consists in the usual way of a rotatable roller 17, around which a paper web 18 to be coated with coating color is guided and conveyed in the transport direction 19. The direction of rotation of the roller 17 is corresponding.
  • Below the roller 17 there is a rotatable inking roller 20 which bears against the paper web 18 and the roller 17.
  • the application roller 20 dips with its underside into a paint container 21, from which it receives coating color and transfers it to the paper web 18.
  • a squeegee 22 is also provided which strips off the coating color applied in excess of 25 to 40 to the paper web 18, so that the paper web 18 is coated only with a very thin layer of the coating color which is simultaneously applied by the squeegee 22 in the surface of the paper web 18 is pressed in.
  • the flow line 12 opens into the paint container 21; likewise the return line 16 opens out of this.
  • a return pump 23 can be arranged in the return line 16 as a vacuum barrier, which prevents the partial vacuum from breaking through from the drum 4 into the ink container 21.
  • a feed pump 24, which also serves as a vacuum barrier, can be arranged in line 2, which prevents the partial vacuum from breaking out of the drum 4 into the mixer 1.
  • siphon connecting lines 25 or 26 can connect the return line 16 or line 2 to the lower area of the drum 4 filled with coating color
  • these siphon connecting lines 25 , 26 extend by a dimension L to below the level 27 of the coating color in the drum 4, which corresponds to the partial vacuum in the upper region of the drum 4. This also prevents the partial vacuum from breaking out of the drum 4 into the return line 16 and thus the application device 15 or the line 2 and thus the mixer 1.
  • the necessary length is directly proportional to the partial vacuum prevailing in the upper region of the drum 4 and inversely proportional to the Coating color density.
  • the siphon connecting lines 25 and 26 are shown in dashed lines in the drawing. In this embodiment, the mixer 1 or the application device 15 must be arranged above the mirror 27 in order to enable the coating color to be transported by gravity.
  • the vacuum mixing container 3 is arranged on a balance 28, by means of which it is ensured that the filling level of the drum 4, i.e. the level 27 of the coating color in the drum 4 only fluctuates within predetermined limits.
  • a solenoid valve 29 in line 2 can be controlled by the balance 28, by means of which the supply of coating color from the mixer 1 is controlled.
  • the scale 28 can also control the motor 30 of the feed pump 13, which affects the circulation of the coating color.
  • a foam probe 31 is arranged in the vacuum attachment 7, via which a ventilation valve 32 in the vacuum line 9 is activated when colored foam penetrates into the vacuum attachment 7, as a result of which the partial vacuum in the interior 8 of the drum 4 is destroyed in such a case , so that the risk of penetration of colored foam into the vacuum line 9 and thus the vacuum pump 10 is excluded.
  • the system works as follows. From the mixer 1, coating color 3 is fed via the line 2 to the vacuum mixing container as required. The quantity supplied per unit of time corresponds to the quantity of coating color applied to the paper web 18 in the application device 15. In the vacuum mixing container 3, the total supply of coating color is circulated by the relatively slow rotating mixer 6. As a result, due to the partial vacuum in the interior 8 of the drum 4, there is good ventilation of the coating color, namely both macro ventilation and a micro-ventilation corresponding to the size of the partial vacuum. Macro deaeration is primarily the destruction of foam, while micro deaeration is the removal of very small air bubbles from the coating color.
  • the coating color is conveyed by means of the feed pump 13 through the filter 14 into the ink container 21 of the coating color application device 15 and applied here to the paper web 18. Since the coating color has been deaerated to a large extent, the ink layer applied to the paper web 18 is at least largely free of microscopic air bubbles which could burst open and impair the surface of the now coated paper web 18. Coating ink is conveyed back from the ink container 21 to the vacuum mixing container 3. The coating color is fed to the application device 15 with an excess of about 25 to 40 °, i.e. it is fed to the application device 15 twenty-five to forty times as much coating color per unit of time, which is applied to the paper web 18 after passing the doctor blade 22.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)
EP96103246A 1995-03-09 1996-03-02 Verfahren und Anlage zum Behandeln von Streichfarbe beim Auftrag auf eine Papier-Bahn Withdrawn EP0731213A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995108178 DE19508178A1 (de) 1995-03-09 1995-03-09 Verfahren und Anlage zum Behandeln von Streichfarbe beim Auftrag auf eine Papier-Bahn
DE19508178 1995-03-09

Publications (2)

Publication Number Publication Date
EP0731213A2 true EP0731213A2 (de) 1996-09-11
EP0731213A3 EP0731213A3 (enrdf_load_stackoverflow) 1996-10-16

Family

ID=7756008

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96103246A Withdrawn EP0731213A2 (de) 1995-03-09 1996-03-02 Verfahren und Anlage zum Behandeln von Streichfarbe beim Auftrag auf eine Papier-Bahn

Country Status (3)

Country Link
EP (1) EP0731213A2 (enrdf_load_stackoverflow)
CA (1) CA2170929A1 (enrdf_load_stackoverflow)
DE (1) DE19508178A1 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0916765A1 (en) * 1997-11-13 1999-05-19 Valmet-Raisio Oy Method and assembly for separating foreign material away from the machine circulation of coating mix in a coating station
EP0960980A1 (en) * 1998-05-25 1999-12-01 Valmet-Raisio Oy Method and arrangement for feeding a web treating agent to a paper or board web processing apparatus
DE102004005080A1 (de) * 2004-02-02 2005-08-18 Voith Paper Patent Gmbh Kontinuierliche gesteuerte Streichfarbenaufbereitung
EP1700953A1 (de) * 2005-03-10 2006-09-13 Sappi Alfeld GmbH Verfahren zur Reinigung und Wiederverwertung von Streichfarben
EP1518962A3 (de) * 2003-09-16 2009-08-05 Voith Patent GmbH Vorrichtung zur Streichfarbenaufbereitung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE390317B (sv) * 1975-04-28 1976-12-13 Billeruds Ab Sett for ytbeleggning av en bana med en vetska
DE3713278A1 (de) * 1986-04-30 1987-11-05 Will E C H Gmbh & Co Verfahren und vorrichtung zum auftragen einer fliessfaehigen masse auf eine bahn
DD276039A1 (de) * 1988-10-12 1990-02-14 Wolfen Filmfab Veb Verfahren zum beschichten von materialbahnen
DE4002256A1 (de) * 1990-01-26 1991-08-01 Voith Gmbh J M Beschichtungsverfahren und auftragseinrichtung zur beschichtung laufender warenbahnen aus papier oder karton
DE3935476A1 (de) * 1989-10-25 1991-05-02 Mueller Thomas Gmbh Verfahren zur eliminierung von blasen in mitteln
DE4031437C2 (de) * 1990-10-04 1997-01-16 Dielektra Gmbh Verfahren und Vorrichtung zum Imprägnieren einer Trägerbahn
DE4205993A1 (de) * 1992-02-27 1993-09-02 Jagenberg Ag Vorrichtung zum auftragen von beschichtungsmaterial auf eine laufende materialbahn
DE4230276A1 (de) * 1992-09-10 1994-03-17 Voith Gmbh J M Streicheinrichtung für laufende Bahnen, insbesondere Papier oder Karton
DE4309002A1 (de) * 1993-03-20 1994-09-22 Voith Gmbh J M Dosiereinrichtung zur Beschichtung laufender Bahnen, vorzugsweise aus Papier oder Karton

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0916765A1 (en) * 1997-11-13 1999-05-19 Valmet-Raisio Oy Method and assembly for separating foreign material away from the machine circulation of coating mix in a coating station
EP0960980A1 (en) * 1998-05-25 1999-12-01 Valmet-Raisio Oy Method and arrangement for feeding a web treating agent to a paper or board web processing apparatus
EP1518962A3 (de) * 2003-09-16 2009-08-05 Voith Patent GmbH Vorrichtung zur Streichfarbenaufbereitung
DE102004005080A1 (de) * 2004-02-02 2005-08-18 Voith Paper Patent Gmbh Kontinuierliche gesteuerte Streichfarbenaufbereitung
EP1700953A1 (de) * 2005-03-10 2006-09-13 Sappi Alfeld GmbH Verfahren zur Reinigung und Wiederverwertung von Streichfarben

Also Published As

Publication number Publication date
DE19508178A1 (de) 1996-09-12
CA2170929A1 (en) 1996-09-10
EP0731213A3 (enrdf_load_stackoverflow) 1996-10-16

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