EP0481024A1 - Dispositif pour l'enduction d'une bande de materiau, en particulier une bande de papier ou de carton. - Google Patents

Dispositif pour l'enduction d'une bande de materiau, en particulier une bande de papier ou de carton.

Info

Publication number
EP0481024A1
EP0481024A1 EP91906670A EP91906670A EP0481024A1 EP 0481024 A1 EP0481024 A1 EP 0481024A1 EP 91906670 A EP91906670 A EP 91906670A EP 91906670 A EP91906670 A EP 91906670A EP 0481024 A1 EP0481024 A1 EP 0481024A1
Authority
EP
European Patent Office
Prior art keywords
web
transfer roller
roller
coating
excess
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.)
Granted
Application number
EP91906670A
Other languages
German (de)
English (en)
Other versions
EP0481024B1 (fr
Inventor
Herbert Sommer
Guenter Franz
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.)
Jagenberg AG
Original Assignee
Jagenberg AG
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 Jagenberg AG filed Critical Jagenberg AG
Publication of EP0481024A1 publication Critical patent/EP0481024A1/fr
Application granted granted Critical
Publication of EP0481024B1 publication Critical patent/EP0481024B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B05C1/0839—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 unsupported at the line of contact between the coating roller and the work
    • 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
    • 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
    • B05C1/12—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 fed round the roller
    • 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
    • D21H23/60—Details thereof, e.g. surface characteristics, peripheral speed the material on the applicator roll being subjected to a particular treatment before applying to the paper
    • 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
    • D21H25/16—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with a blast of vapour or gas, e.g. air knife

Definitions

  • the invention relates to a device for coating a material web, in particular a paper or cardboard web, according to the preamble of patent claim 1.
  • Coating devices of this type are used in particular for coating cardboard in order to achieve a voluminous application with a uniform layer cover following the surface contour.
  • US Pat. No. 3,235,401 describes a generic device in which the material web to be coated is deflected by a guide roller to a transfer roller of an application unit.
  • the transfer roller draws coating color from a paint tray and applies it in excess to the web. Part of the coating color applied in excess to strip off, the web is guided after the transfer roller over a driven, with a wire wrapped doctor blade rod. At a distance from the doctor blade rod, there is a counter roller which deflects the web, an air knife being arranged in the looped area, which strips off the excess coating color to the desired coat weight.
  • the invention has for its object to improve a generic coating device so that significantly higher production speeds can be achieved without quality degradation.
  • Web speed disproportionately increasing impulse of the coating color can remove ever smaller excess amounts with increasing web speeds.
  • a prerequisite for the lowest possible excess order is a very even order without local increases, e.g. B. in the form of strips, which can not be achieved with the generic application at high speeds.
  • B. drainage of the applied coating color with small excess amounts, which affect the final metering with the air knife.
  • This effect also occurs when predosing on the web, e.g. B. with a doctor or a so-called pre-metering roller.
  • a uniform application with a small excess is generated on the transfer roller, which is transferred evenly and without errors to the web due to the arrangement of the guide roller.
  • the short distance between the applicator and the air knife significantly reduces the problems with final dosing caused by dewatering the coating color.
  • Fig. 1 shows a schematic side view of a coating device according to the invention.
  • the material web 1 to be coated is deflected by a guide roller 2, guided approximately tangentially to the upper part of a transfer roller 3 of an applicator unit 4.
  • the rubber-coated transfer roller 3 has a smooth outer surface. With its lower part, it dips into a paint trough 5, into which excess coating slip is continuously introduced and is kept at a constant level by means of overflows 6 arranged on both sides.
  • the transfer roller 3 rotates in the opposite direction to the running direction of the web 1, the gap to the guide roller 2 being less than 8 mm, preferably 0.5-3 mm. This small gap width ensures that the web 1 is applied flatly to the transfer roller 3 in order to ensure a uniform transfer of the coating color from the transfer roller 3 to the web 1.
  • another inking unit e.g. B. a nozzle applicator, can be arranged for applying coating color in excess.
  • a machine-wide roller doctor rod 7 is mounted in an elastic holder 8, which can be pressed against the surface of the transfer roller 3 with an adjustable contact pressure.
  • the roller doctor rod 7, which is driven in the same direction as the transfer roller 3 - that is to say in the opposite direction at the point of contact - has elevations and depressions on its surface. It preferably contains circumferential grooves which were produced either by wrapping with a wire or by surface treatment.
  • the wire has a diameter of 0.6 mm - 1 mm, otherwise the surface of the doctor rod 7 is machined so that there is a flow cross-section corresponding to this wire diameter.
  • a counter roller 9 follows at the shortest possible distance, which deflects the web 1 by at least 90 °.
  • an air knife 10 is arranged as a metering device, which contains, as an essential component, a slot nozzle 11 with which an accelerated, sharp air jet is directed onto the web 1 in order to strip off the coating color to the desired coat weight.
  • slot nozzles are known and z. B. in DE-PS 30 48 133 and DE-PS 30 48 134 described.
  • double air knives are usually used, which have two slot nozzles in a support body.
  • the web 1 is laid flat on the transfer roller 3 by the guide roller 2.
  • the transfer roller 3 draws from the tub 5 coating color in excess, which is stripped off by the doctor blade 7 to 1.1 to 2 times the desired coat weight after the final metering with the air knife 10.
  • the doctor blade rod 7 produces a very uniform film on the surface of the transfer roller 3, which is then transferred to the web 1. It has been shown that a uniform layer with a small excess amount can be produced on the web 1 if the gap width between the guide roller 2 and the transfer roller 3 is less than 8 mm, in particular in the range between 0.5 and 3 mm, and the ratio of web speed / peripheral speed of the transfer roller 3 is within a certain range.
  • the ratio of the two speeds depends on the specific flow cross section A of the doctor rod 7 at the line of contact with the transfer roller 3.
  • the ratio is preferably 0.015 x A to 0.022 x A, the specific flow cross section in mm 2 per m of doctor blade length being used for A.
  • this gives a ratio of 1.61 - 2.36.
  • the axis of rotation of the guide roller 2 is adjustable. Depending on the type of paper and the coating color used, the wrap angle on the transfer roller 3 is between 5 ° and 30 °.
  • the air knife 10 follows as close as possible behind the applicator 4. With the air knife 10, the small excess amount of 10 - 100% is removed and the desired coat weight is achieved.
  • the transfer roller 3 is preferably driven in the opposite direction to the running direction of the web 1.
  • the doctor rod 7 is therefore arranged on the outlet side of the web 1 (on the right in FIG. 1).
  • the direction of rotation of the transfer roller 3 can be reversed, that is, a concurrent application of paint.
  • the doctor blade rod 7 'with its holder 8' is located on the inlet side of the transfer roller 3 (shown in broken lines in FIG. 1). The advantages described then only occur in part.

Landscapes

  • Paper (AREA)
  • Coating Apparatus (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Abstract

Pour l'enduction de bandes de papier ou de carton, il existe des dispositifs connus qui comportent un mécanisme d'application avec un rouleau de transfert entraîné, partiellement entouré par la bande, pour déposer le produit d'enduction en quantités excédentaires sur la bande, une tige à racle rotative comportant à sa périphérie des aspérités et des creux pour égaliser l'excédent de dépôt et une râcle à air comprimé faisant office de dispositif de dosage final avec un contre-rouleau entouré partiellement par la bande et une buse à fente disposée dans la zone entourée. Pour accroître les vitesses de production sans diminuer la qualité, il est prévu dans l'invention que la tige à racle rotative (7) soit pressée élastiquement sur le rouleau de transfert (3) et que l'écart entre le rouleau de transfert (3) et le contre-rouleau (9) soit inférieur à 1500 mm, et de préférence inférieur à 800 mm.
EP91906670A 1990-05-07 1991-03-27 Dispositif pour l'enduction d'une bande de materiau, en particulier une bande de papier ou de carton Expired - Lifetime EP0481024B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4014463 1990-05-07
DE4014463A DE4014463A1 (de) 1990-05-07 1990-05-07 Vorrichtung zum beschichten einer materialbahn, insbesondere einer papier- oder kartonbahn
PCT/EP1991/000596 WO1991017309A1 (fr) 1990-05-07 1991-03-27 Dispositif pour l'enduction d'une bande de materiau, en particulier une bande de papier ou de carton

Publications (2)

Publication Number Publication Date
EP0481024A1 true EP0481024A1 (fr) 1992-04-22
EP0481024B1 EP0481024B1 (fr) 1995-04-19

Family

ID=6405777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91906670A Expired - Lifetime EP0481024B1 (fr) 1990-05-07 1991-03-27 Dispositif pour l'enduction d'une bande de materiau, en particulier une bande de papier ou de carton

Country Status (7)

Country Link
US (1) US5368893A (fr)
EP (1) EP0481024B1 (fr)
AT (1) ATE121476T1 (fr)
BR (1) BR9105743A (fr)
DE (2) DE4014463A1 (fr)
FI (1) FI97410C (fr)
WO (1) WO1991017309A1 (fr)

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Title
See references of WO9117309A1 *

Also Published As

Publication number Publication date
DE59105249D1 (de) 1995-05-24
FI97410B (fi) 1996-08-30
FI920039A0 (fi) 1992-01-03
EP0481024B1 (fr) 1995-04-19
BR9105743A (pt) 1992-05-19
US5368893A (en) 1994-11-29
DE4014463A1 (de) 1991-11-14
WO1991017309A1 (fr) 1991-11-14
ATE121476T1 (de) 1995-05-15
FI97410C (fi) 1996-12-10

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