EP0533022A1 - Méthode de contrôle de l'accumulation de sauce de couchage sur une lame de station de couchage dans une machine d'enduction de papier - Google Patents

Méthode de contrôle de l'accumulation de sauce de couchage sur une lame de station de couchage dans une machine d'enduction de papier Download PDF

Info

Publication number
EP0533022A1
EP0533022A1 EP19920115312 EP92115312A EP0533022A1 EP 0533022 A1 EP0533022 A1 EP 0533022A1 EP 19920115312 EP19920115312 EP 19920115312 EP 92115312 A EP92115312 A EP 92115312A EP 0533022 A1 EP0533022 A1 EP 0533022A1
Authority
EP
European Patent Office
Prior art keywords
coating
blade
colour
coating machine
machine
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Withdrawn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
EP19920115312
Other languages
German (de)
English (en)
Inventor
Aki Kohonen
Aski Hyttinen
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.)
KAUKAS Oy
Original Assignee
KAUKAS 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
Priority claimed from FI914320A external-priority patent/FI90264C/fi
Application filed by KAUKAS Oy filed Critical KAUKAS Oy
Publication of EP0533022A1 publication Critical patent/EP0533022A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • 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
    • D21H25/10—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with blades

Definitions

  • the invention relates to a method for controlling the coating colour build-up on a blade at the coating stations in a paper coating machine.
  • energy is supplied to the coating colour build-up (stalagmite) by means of a dryer and/or the temperature of the coating mixture is adjusted so that the coating colour build-up will not cause problems in the coating.
  • the energy supplied to the coating colour build-up by the dryer is converted into heat, thus further evaporating liquid from the build-up.
  • the rheology of the coating mixture can be altered by adjusting its temperature so that the coating colour build-up will not cause problems in the coating.
  • Paper coating is a very important process stage in the production of coated printing paper.
  • a uniform coating mixture containing pigments, binding agents, additives and water is applied to the surface of paper at the coating stations, and then dried.
  • the coating mixture is called coating colour.
  • the purpose of paper coating is to improve the paper properties, such as brightness and print quality.
  • the gloss of calendered coated paper is also considerably higher as compared with uncoated paper.
  • the amount of coating material to be applied to the surface of paper is adjusted by varying the dry solids content of the coating colour, or by varying the scraping pressure that the doctor blade exerts on the paper at the coating station of the coating machine.
  • the scraping pressure is also called blade pressure.
  • the amount of applied paper coating material decreases with increasing blade pressure or with decreasing dry solids content of the colour.
  • the amount of paper coating material increases with decreasing blade pressure or with increasing dry solids content of the coating colour.
  • the blade pressure depends not only on the desired amount of coating material but also on the properties of the pigments and the binding agent, the roughness and porosity of the base paper to be coated, and the speed of the coating machine.
  • the coating colour build-up on the blade becomes problematic when the coating colour build-up splashes, and the splashes stick to the coated paper, where they cause stripes and round coating colour accumulations.
  • the stripes or coating colour accumulations cause breaks and printability problems in further processing.
  • the build-up of coating colour on the blade of the coating machine increases with the speed of the coating machine, the build-up of coating colour restricts the running speed of the coating machine.
  • the object of the present invention is to dry up the coating colour build-up and/or to alter the rheology of the coating colour by adjusting the temperature of the coating colour so that the speed of the coating machine need not be decreased.
  • This object is achieved by means of a method according to the invention, which is characterized in that a dryer is mounted on the blade of the coating machine or in the vicinity of the blade so as to dry the coating colour build-up so that it remains dry at different running speeds of the coating machine, and/or a heat exchanger is mounted in the machine or storage circulation of the coating colour for cooling and/or warming the coating colour so that the rheological properties of the coating colour can be affected by adjusting the temperature of the coating colour in such a way that the coating colour build-up remains dry at different running speeds of the coating machine.
  • the new method can be applied to all coating machines in which a dryer for the coating colour build-up can be mounted in the vicinity of the blade or on the blade and/or a heat-exchanger can be provided in the machine or storage circulation of the coating colour.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Drying Of Solid Materials (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
EP19920115312 1991-09-13 1992-09-08 Méthode de contrôle de l'accumulation de sauce de couchage sur une lame de station de couchage dans une machine d'enduction de papier Withdrawn EP0533022A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI914320A FI90264C (fi) 1991-09-13 1991-09-13 Menetelmä paperin päällystyskoneen päällystysasemien terälle kertyvän teräparran kuivattamiseksi
FI914320 1991-09-13
FI923729A FI90892C (fi) 1991-09-13 1992-08-19 Menetelmä paperin päällystyskoneen päällystysasemien teräparran hallitsemiseksi
FI923729 1992-08-19

Publications (1)

Publication Number Publication Date
EP0533022A1 true EP0533022A1 (fr) 1993-03-24

Family

ID=26159015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920115312 Withdrawn EP0533022A1 (fr) 1991-09-13 1992-09-08 Méthode de contrôle de l'accumulation de sauce de couchage sur une lame de station de couchage dans une machine d'enduction de papier

Country Status (2)

Country Link
EP (1) EP0533022A1 (fr)
FI (1) FI90892C (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152918A (en) * 1961-06-02 1964-10-13 Kimberly Clark Co Process of coating paper with a trailing blade
EP0387412A2 (fr) * 1989-03-15 1990-09-19 JAGENBERG Aktiengesellschaft Procédé et dispositif pour revêtir une bande en particulier une bande de papier ou de carton
EP0460771A1 (fr) * 1990-06-08 1991-12-11 KNP Papier B.V. Appareil et procédé pour empêcher la formation de stalagmite lors du couchage du papier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152918A (en) * 1961-06-02 1964-10-13 Kimberly Clark Co Process of coating paper with a trailing blade
EP0387412A2 (fr) * 1989-03-15 1990-09-19 JAGENBERG Aktiengesellschaft Procédé et dispositif pour revêtir une bande en particulier une bande de papier ou de carton
EP0460771A1 (fr) * 1990-06-08 1991-12-11 KNP Papier B.V. Appareil et procédé pour empêcher la formation de stalagmite lors du couchage du papier

Also Published As

Publication number Publication date
FI923729A (fi) 1993-03-14
FI90892B (fi) 1993-12-31
FI923729A0 (fi) 1992-08-19
FI90892C (fi) 1994-04-11

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