EP0799934A1 - Procédé et dispositif pour enduire une couche CB sur une feuille de papier - Google Patents

Procédé et dispositif pour enduire une couche CB sur une feuille de papier Download PDF

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Publication number
EP0799934A1
EP0799934A1 EP96105296A EP96105296A EP0799934A1 EP 0799934 A1 EP0799934 A1 EP 0799934A1 EP 96105296 A EP96105296 A EP 96105296A EP 96105296 A EP96105296 A EP 96105296A EP 0799934 A1 EP0799934 A1 EP 0799934A1
Authority
EP
European Patent Office
Prior art keywords
coating
roll
roller
nip
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Withdrawn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
EP96105296A
Other languages
German (de)
English (en)
Inventor
Rüdiger KURTZ
Martin Kustermann
Michael Trefz
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 Sulzer Papiermaschinen 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 Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Priority to EP96105296A priority Critical patent/EP0799934A1/fr
Publication of EP0799934A1 publication Critical patent/EP0799934A1/fr
Withdrawn legal-status Critical Current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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/0834—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets the coating roller co-operating with other rollers, e.g. dosing, transfer rollers
    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
    • 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
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
    • B41M5/1246—Application of the layer, e.g. by printing

Definitions

  • the invention relates to a method for producing a paper web which has a so-called CB layer, in particular with the features specified in the preamble of claim 1.
  • the invention also relates to an apparatus for performing this method.
  • a CB layer applied to paper contains a color former enclosed in microcapsules, which cooperates with a so-called CF layer (containing a color-reactive pigment) on another paper (e.g. in a set of forms) in such a way that visible signs (e.g. when copying) are visible arise.
  • the nip through which the paper web passes is set to a distance "which is not less than the thickness of the uncoated paper".
  • this known method it can be expected that it is very difficult or even impossible to transfer the coating slip onto the paper web surface with the necessary uniformity.
  • the distance between the two roller shells can be different due to different temperatures and the resulting local changes in diameter.
  • the invention is therefore based on the object of further developing the method specified in the preamble of claim 1 in such a way that the finished paper web, which has a pressure-sensitive CB layer, meets higher quality requirements than hitherto.
  • the device specified in the preamble of claim 4 is to be further developed.
  • the stated object is achieved by the characterizing method feature of claim 1 or by the characterizing device feature of claim 4.
  • the inventors have recognized that the microcapsules contained in the CB coating slip - as long as they are suspended in the liquid coating slip - can withstand a certain pressure.
  • the CB coating slip can be safely transferred to the paper web in a nip, but structural measures must be taken to ensure that there is not an excessively high mean surface pressure in the nip. This results in a much more even stroke application than before.
  • the banding to be expected in the prior art is avoided, in particular because the previously existing risk of slippage between the paper web and the roller surfaces has been eliminated. In other words, a certain frictional connection is made between the paper web and the two driven rollers. This means that achieved that paper web breaks are much less likely than previously to be expected.
  • the method according to the invention can thus be operated with a higher running efficiency than the known method.
  • the above-mentioned constructive measures include that a minimum length of the nip is ensured according to claim 3 or 5; ie the paper web comes in the nip in contact with both roller jackets simultaneously over a certain running distance. This helps to keep the mean surface pressure at relatively low values.
  • the length of the nip to be expected in the web running direction can be determined by means of known calculation methods (Hertz formula), namely taking into account the roller diameter, the line force as well as the materials and the modulus of elasticity of the roller shells.
  • Particularly favorable values can be achieved if one of the two rollers is designed as a shoe press roller; because in this case, the contact pressure is known to be distributed over a particularly large area. Similar to known shoe press rolls (from paper making machines), a particularly sensitive and gradual increase in the contact pressure can be ensured when the paper web and the CB layer to be applied enter the roll nip. At the same time, it is possible to ensure a relatively rapid, steep drop in pressure when leaving the nip. This further increases the uniformity (in other words, the smoothness) of the surface of the CB layer. The streak formation observed up to now is thereby almost completely avoided.
  • FIGS. 1 to 4 shows a device according to the invention for producing a CB layer, in each case in a schematic side view.
  • a coating roller 2 and a counter roller 1 together form a nip (a) through which a paper web 3 to be coated runs.
  • a supply and metering device for CB coating color generally designated CB
  • This device comprises a known scoop roller 6, which conveys the ink from a reservoir 12 to the coating roller 2. This forms a fine metering gap with a metering roller 14. In this way, a thin coating film is produced on the roll shell of the coating roll (2) from the supplied CB coating slip, which film is then transferred to the paper web (3) in the roll gap (a).
  • one of the two rollers rests in immovable bearings.
  • the bearings of the other roller are movable; i.e. they rest, for example, in swivel levers 4, which can be actuated by means of a loading device (e.g. hydraulic cylinder 13).
  • the hydraulic cylinder presses the two rollers 1 and 2 against each other. It is counteracted by an energy accumulator, e.g. a compression spring 14.
  • an energy accumulator e.g. a compression spring 14.
  • the other side of the paper web 3 (the top side according to FIG. 1) can remain unchanged when the CB layer is applied to the bottom side.
  • any medium e.g. Water, or starch or any coating color (for example a CF coating color) are applied to the counter roller 1, which then transfers this medium to the other side of the paper web 3.
  • FIG. 1 it is indicated that the peripheral speed v 1 of the metering roller 14 is lower than the working speed v of the entire device. As a result, a particularly fine dosage of the CB layer to be applied is achieved.
  • FIG. 2 differs from FIG. 1 essentially only in that a shoe press roll 1 'is provided instead of a normal counter roll.
  • This has a circumferential flexible press jacket 1a through which a stationary support body 7 extends.
  • a radially movable press shoe 5 has a concave (and adapted to the coating roller 2) sliding surface for the press jacket 1a. It is guided in the support body 7 and can press the press cover 1a sensitively onto the coating roller 2.
  • a stationary slide shoe 8 with a convex slide surface is provided on the support body 7.
  • an additional feed and metering device 16 can be provided on the outside of the press casing 1a.
  • FIGS. 1 and 2 the paper web essentially runs through the nip from top to bottom.
  • Feed and metering devices CF or 16 or 16 ' are used here. These are designed so that they are on the downward-facing side of the relevant Roll shell can be arranged.
  • the feed and metering device 16 'provided on the counter roll 1 of FIG. 3 forms, together with the roll shell, a liquid sump, while the other feed and metering devices CF or 16 avoid such a sump and are therefore suitable for higher working speeds.
  • the CB coating color (and / or possibly the medium to be applied to the opposite side) can be fed to the relevant roller 2 or 1 by means of a free jet nozzle known per se. Then, if necessary, excess CB coating color (or excess medium) can be scraped off the roller.

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  • Color Printing (AREA)
  • Paper (AREA)
EP96105296A 1996-04-03 1996-04-03 Procédé et dispositif pour enduire une couche CB sur une feuille de papier Withdrawn EP0799934A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96105296A EP0799934A1 (fr) 1996-04-03 1996-04-03 Procédé et dispositif pour enduire une couche CB sur une feuille de papier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96105296A EP0799934A1 (fr) 1996-04-03 1996-04-03 Procédé et dispositif pour enduire une couche CB sur une feuille de papier

Publications (1)

Publication Number Publication Date
EP0799934A1 true EP0799934A1 (fr) 1997-10-08

Family

ID=8222642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96105296A Withdrawn EP0799934A1 (fr) 1996-04-03 1996-04-03 Procédé et dispositif pour enduire une couche CB sur une feuille de papier

Country Status (1)

Country Link
EP (1) EP0799934A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007029578A1 (de) * 2007-06-26 2009-01-08 Holger Volz Pulverbeschichter
CN103433173A (zh) * 2013-08-20 2013-12-11 张银国 全自动翻盖纸片涂胶机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1433165A (en) * 1973-09-13 1976-04-22 Wiggins Teape Ltd Coated
US4347269A (en) * 1980-04-08 1982-08-31 The Wiggins Teape Group Limited Method of and apparatus for applying a coating to a web of sheet material
EP0385640A2 (fr) * 1989-02-23 1990-09-05 The Wiggins Teape Group Limited Procédé d'application de compositions contenant des microcapsules sur du papier
WO1991015306A1 (fr) * 1990-04-03 1991-10-17 Btg Källe Inventing Ab Procede de revetement a deux faces d'une bande mobile
DE4224718A1 (de) * 1992-07-27 1994-02-03 Feldmuehle Ag Stora Verfahren zur Herstellung einer eine CB-Schicht aufweisenden Papierbahn für druckempfindliche Aufzeichnungspapiere

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1433165A (en) * 1973-09-13 1976-04-22 Wiggins Teape Ltd Coated
US4347269A (en) * 1980-04-08 1982-08-31 The Wiggins Teape Group Limited Method of and apparatus for applying a coating to a web of sheet material
EP0385640A2 (fr) * 1989-02-23 1990-09-05 The Wiggins Teape Group Limited Procédé d'application de compositions contenant des microcapsules sur du papier
WO1991015306A1 (fr) * 1990-04-03 1991-10-17 Btg Källe Inventing Ab Procede de revetement a deux faces d'une bande mobile
DE4224718A1 (de) * 1992-07-27 1994-02-03 Feldmuehle Ag Stora Verfahren zur Herstellung einer eine CB-Schicht aufweisenden Papierbahn für druckempfindliche Aufzeichnungspapiere

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007029578A1 (de) * 2007-06-26 2009-01-08 Holger Volz Pulverbeschichter
DE102007029578B4 (de) * 2007-06-26 2010-05-12 Holger Volz Pulverbeschichter
CN103433173A (zh) * 2013-08-20 2013-12-11 张银国 全自动翻盖纸片涂胶机
CN103433173B (zh) * 2013-08-20 2015-08-05 张银国 全自动翻盖纸片涂胶机

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