CA2035061A1 - Coating process and applicator device for coating running webs of paper or cardboard - Google Patents
Coating process and applicator device for coating running webs of paper or cardboardInfo
- Publication number
- CA2035061A1 CA2035061A1 CA002035061A CA2035061A CA2035061A1 CA 2035061 A1 CA2035061 A1 CA 2035061A1 CA 002035061 A CA002035061 A CA 002035061A CA 2035061 A CA2035061 A CA 2035061A CA 2035061 A1 CA2035061 A1 CA 2035061A1
- Authority
- CA
- Canada
- Prior art keywords
- coating
- substance
- web
- roll
- coating substance
- 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.)
- Abandoned
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 102
- 239000011248 coating agent Substances 0.000 title claims abstract description 74
- 239000011111 cardboard Substances 0.000 title claims abstract description 12
- 239000011087 paperboard Substances 0.000 title claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 61
- 238000000034 method Methods 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 19
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims description 23
- 239000007787 solid Substances 0.000 claims description 19
- 239000000049 pigment Substances 0.000 claims description 11
- 239000011247 coating layer Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000002349 favourable effect Effects 0.000 description 3
- 238000009499 grossing Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
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
- D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
-
- 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
-
- 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
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
- B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
-
- 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
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of 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
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material
Landscapes
- Paper (AREA)
- Coating Apparatus (AREA)
- Saccharide Compounds (AREA)
- Fats And Perfumes (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a process for the coating of a running web of paper or cardboard, provisions are that in a press gap formed between two rolls a coating substance applied in a very small quantity on the surface of the one roll is first pressed on the web leaving a very thin coat on the web which, however, covers all spots including the "mounds" of microroughness. Next, the second coat can be applied and dosed on the still moist first coat with the usual means. In the process, the first coat is preferably dosed on the shell of the first roll, by means of the peripheral grooves of a rotary doctor. The same may be performed also as regards the second coating on the web.
In a process for the coating of a running web of paper or cardboard, provisions are that in a press gap formed between two rolls a coating substance applied in a very small quantity on the surface of the one roll is first pressed on the web leaving a very thin coat on the web which, however, covers all spots including the "mounds" of microroughness. Next, the second coat can be applied and dosed on the still moist first coat with the usual means. In the process, the first coat is preferably dosed on the shell of the first roll, by means of the peripheral grooves of a rotary doctor. The same may be performed also as regards the second coating on the web.
Description
;~ Q ~
For the coating of cardboard it has been demons~rated to be favorable to only dose the second application coat by means of the grooves of a rotary doctor provided with peripheral grooving, without acting on the coat with another smoothing element. With proper ad~ustment of the consistency of the coating substance, a sufficient spreading is accompli~hed, making an additional smoothing unneces~a~y, which might be as60ciated with scrape-off disadvantages.
Accordingly, in one of its aspects the present invention provides a process for coating a running web of paper or cardboard, compri~ing:
providing at least one rotatable roll having a chell surface for the support of the web during ~ first coating process;
providing at least one rotatable roll for the support of the web during a second coating proce~s;
applying by way of a rotary doctor to the ~hell 6urface of the rotatable roll of the first coating process a ~mall dosed quantity of a first coating substance, the rotary doctor having closely adjacent fine peripheral groGves or helical grooves, the first coating substance having a 601id or pigment substance content, the ~olid substance content being maximally 70%;
passing the web through a press ~ap formed between a backing roll and the rvtatable roll of the first coating process wherein the dosed quantity of the first coating substance i~ pressed on the web as it passes through the press gap so that at least a thin layer of the first coating ~ubstance cover~ the web, specifically with regard to the solid or pigment content; and applying a second coating ~ubstance to the web durin~ the 6econd coating proce~s, at least the 6econd coating subs~ance being do~d and applied direotly on the web, wher~in the ~econd coating substance i~ applied in direct 6uccession to the first layer ~ne upon the other while the fir~t layer i~ ~till ~oist.
~3 In another of its aspects, the present invention provides a process for coating a running web of paper or cardboard, comprising:
providing at least one rotatable roll having a ~hell surface for ~he support of the w~b during ~ fir~t coating process;
providing at least one rotatzble roll for the support of the web during a second coating process;
applyin~ by way of a doctor blade to ~he ~hell ~urface of the rotatable roll of the first coating process a small dosed guantity of a first coating sub~tance, the iirst coating subs~ance haviny a solid or pi~ment ~ubs~ance contant, the solid substance content being maximally 70%;
passing the web through a pres~ gap formed between a backing roll and ~he rotatable roll of the first coating procesg wherei~l thç~ dosed quantity of th& firBt ~oating substance is pressed on the web a~ it pas~es through the press gap so that at least a thin layer of the irs t coating substance covers the web, specifically with regard to the solid or pigment content; and applying a second coatirlg 6ubstance to the web during the second coating process, at least the second coating substance being dosed and applied directly on the web, wherein the second coating substance i8 applied in direct succes3ion to the first lay~r one upon the other whilQ the first layer i8 still moist.
In yet another of its aspects, the present invention provides a device for coating a runnin~ web, comprising~
at least one rotatable roll having a shell surface for th~
support of ~he web during a first coating proce~s;
a backing roll situated generally axially parallel to and in clo~ely spaced relationship to -the roll ~upporti~g the web durin~ the first coating proce~s ~o that a press gap i~ formed therebetween;
~3~3~
first applicator means for applying to the ahell surface of the roll of the fir~t ~oating process a 6mall dosed quantity of a first coating ~ubstance, the first applicator mean~ including a nozzle chamber having a discharge end near the roll shell ~urface through which the fir6t coating ~ubstance i~ passed, the first applicator means further including a holder and a rotary doctor arranged at the discharge end, the rotary doct~r having closely adjacent fine peripheral groove~ or helical grooves, the fir~t coating substance having a ~olid ~r pigment ~ubstance content, the ~olid sub~tance content being maximally 70%;
means for passing the web through the pre~ gap wherein the do~ed quantity of the first coating ~ubsta~ce i~ pres&ed on the we~ so that at least a thin layer of the fir~t coating ~ubstance covers the web, 6pecifically with regard to the ~olid or pigment content;
second applicator means for applying a layer of a seCond coating substance directly on .the web during a ~econd coating process, the ~econd layer being applied in direct ~uccession to the first layer one upon the other while the fir~t lay~r i8 ~till moistl the 6econd applicator means including a nozzle chamber having a dischar~e end through which the sacond coating substance i~ pas6ed, th~ 6econd applicator means further including a holder and a rotary doctor arran~ed at the di4charge end near the surf~ce to ~e ~oated.
The above mentioned and other features and objects of this invention, and the manner of attaining them, will become more apparent and the invention itself will be fur~r und4rstood by reference to the following description of ernbodiments of the in~ention taken in conjunction with the accompanying drawings, wherein:
Fig. 1 i8 an apparatus for coating a running web of paper or cardboard in accordance with the present invention;
~ ~ 3 ~
Fig. 2 i~ sn alternate embodLment of ~he coating apparatus of the present invention wherein only two rolls are utilized;
Fig. 3 is another embodiment of the coating apparatus of the present invention wherein a rotary doctor provided with peripheral grooving is provided as a dosing element for the final dosing; and Fig. 4 is a further embodiment of the present invention wherein a transfer roll is utilized to apply the coating substance.
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate a preferred embodime~t of the invention, in one form thereof, and such exemplifications are not to be construed as limiting the ~cope of the invention in any manner.
Accordin~ to Fig. 1, the web W runs through a press gap formed between two rolls 1 and 2. Coordinated with roll 1, which is provided with a rubberized surface, is an applicator mechanism that features a nozzle chamber 6 and, on its discharge end, a rotary doctor 7 provided with peripheral or helical grooYing and a holder 8 for the latter. The hardness of the rubber coatin~ of roll 1 may range between 0 and ~00, preferably between lO and 70, P u.J. The amount of coatins applied in the f~rst coating layer in the case of cardboard is dimensioned to be 6 to 40 ml/m2, preferably 12 to 22 ml/m2. The second coat may be applied using a comparable arranyement with rotary doctor ll and its holder 12, along with a nozzle chamber 9, but where the equalizing element may also be a blade or a smooth rotary doctor at the point lO.
The applicable consistencies, i.e., solid substance contents, range for the first coat between 5~ and 70% maximum, and for the second coat between 60 and 70~ maximum. It has been found to be favorable to provide for the applicator mechanism a nozzle chamber 6, q on the discharge end of which, near the surface to be coated, a rotary doctor 7, 11 with its holder 8, 12 is arranged. ~h~s, the advantage here i5, over the airbrush method, that the process may be performed with a relatively high consistency overall, but especially for the second coat. The line pressures in the press gap between the two first rolls 1 and 2 range betwe~n 5 and 60 kN/m, preferably 20 to 40 kN/m.
The setup according to Fig. 2 has only two web support rolls 21 and 22, with an applicator device of the described type coordinated with each. This arrangement is possible in the case of cardboard because it stretches less than paper due to the moistening in the coater.
3 ~
A favorable option in th~ case of cardboard i5 providing on the leaving end of the nozzle chamber 9 as dosing element for the second coat (final dosing) a rotary doctor 11 provided with peripheral grooving and a holder 12~ and to omit a further smoothing element thereafter. This is illustrated in Fig. 3.
With this setup, a very good coating can be obtained at relatively sparing use of coating substance.
Illustrated additionally, in Fig. 4, for the second coating device is a transfer ro]l 17 for the coating substance that may be used as well. A scraping by means of one of the known dosing elements is to be provided thereafter.
In a specific application area, in the case of sizing application for paper, it i5 possible to dose the first coat also with a blade or a suitable lath, instead of a rotary doctor provided with grooves, but the action of the blade needs to be very closely monitored here.
While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles.
Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to whi~h this invention pertains and which fall within the limits of the appended claims.
For the coating of cardboard it has been demons~rated to be favorable to only dose the second application coat by means of the grooves of a rotary doctor provided with peripheral grooving, without acting on the coat with another smoothing element. With proper ad~ustment of the consistency of the coating substance, a sufficient spreading is accompli~hed, making an additional smoothing unneces~a~y, which might be as60ciated with scrape-off disadvantages.
Accordingly, in one of its aspects the present invention provides a process for coating a running web of paper or cardboard, compri~ing:
providing at least one rotatable roll having a chell surface for the support of the web during ~ first coating process;
providing at least one rotatable roll for the support of the web during a second coating proce~s;
applying by way of a rotary doctor to the ~hell 6urface of the rotatable roll of the first coating process a ~mall dosed quantity of a first coating substance, the rotary doctor having closely adjacent fine peripheral groGves or helical grooves, the first coating substance having a 601id or pigment substance content, the ~olid substance content being maximally 70%;
passing the web through a press ~ap formed between a backing roll and the rvtatable roll of the first coating process wherein the dosed quantity of the first coating substance i~ pressed on the web as it passes through the press gap so that at least a thin layer of the first coating ~ubstance cover~ the web, specifically with regard to the solid or pigment content; and applying a second coating ~ubstance to the web durin~ the 6econd coating proce~s, at least the 6econd coating subs~ance being do~d and applied direotly on the web, wher~in the ~econd coating substance i~ applied in direct 6uccession to the first layer ~ne upon the other while the fir~t layer i~ ~till ~oist.
~3 In another of its aspects, the present invention provides a process for coating a running web of paper or cardboard, comprising:
providing at least one rotatable roll having a ~hell surface for ~he support of the w~b during ~ fir~t coating process;
providing at least one rotatzble roll for the support of the web during a second coating process;
applyin~ by way of a doctor blade to ~he ~hell ~urface of the rotatable roll of the first coating process a small dosed guantity of a first coating sub~tance, the iirst coating subs~ance haviny a solid or pi~ment ~ubs~ance contant, the solid substance content being maximally 70%;
passing the web through a pres~ gap formed between a backing roll and ~he rotatable roll of the first coating procesg wherei~l thç~ dosed quantity of th& firBt ~oating substance is pressed on the web a~ it pas~es through the press gap so that at least a thin layer of the irs t coating substance covers the web, specifically with regard to the solid or pigment content; and applying a second coatirlg 6ubstance to the web during the second coating process, at least the second coating substance being dosed and applied directly on the web, wherein the second coating substance i8 applied in direct succes3ion to the first lay~r one upon the other whilQ the first layer i8 still moist.
In yet another of its aspects, the present invention provides a device for coating a runnin~ web, comprising~
at least one rotatable roll having a shell surface for th~
support of ~he web during a first coating proce~s;
a backing roll situated generally axially parallel to and in clo~ely spaced relationship to -the roll ~upporti~g the web durin~ the first coating proce~s ~o that a press gap i~ formed therebetween;
~3~3~
first applicator means for applying to the ahell surface of the roll of the fir~t ~oating process a 6mall dosed quantity of a first coating ~ubstance, the first applicator mean~ including a nozzle chamber having a discharge end near the roll shell ~urface through which the fir6t coating ~ubstance i~ passed, the first applicator means further including a holder and a rotary doctor arranged at the discharge end, the rotary doct~r having closely adjacent fine peripheral groove~ or helical grooves, the fir~t coating substance having a ~olid ~r pigment ~ubstance content, the ~olid sub~tance content being maximally 70%;
means for passing the web through the pre~ gap wherein the do~ed quantity of the first coating ~ubsta~ce i~ pres&ed on the we~ so that at least a thin layer of the fir~t coating ~ubstance covers the web, 6pecifically with regard to the ~olid or pigment content;
second applicator means for applying a layer of a seCond coating substance directly on .the web during a ~econd coating process, the ~econd layer being applied in direct ~uccession to the first layer one upon the other while the fir~t lay~r i8 ~till moistl the 6econd applicator means including a nozzle chamber having a dischar~e end through which the sacond coating substance i~ pas6ed, th~ 6econd applicator means further including a holder and a rotary doctor arran~ed at the di4charge end near the surf~ce to ~e ~oated.
The above mentioned and other features and objects of this invention, and the manner of attaining them, will become more apparent and the invention itself will be fur~r und4rstood by reference to the following description of ernbodiments of the in~ention taken in conjunction with the accompanying drawings, wherein:
Fig. 1 i8 an apparatus for coating a running web of paper or cardboard in accordance with the present invention;
~ ~ 3 ~
Fig. 2 i~ sn alternate embodLment of ~he coating apparatus of the present invention wherein only two rolls are utilized;
Fig. 3 is another embodiment of the coating apparatus of the present invention wherein a rotary doctor provided with peripheral grooving is provided as a dosing element for the final dosing; and Fig. 4 is a further embodiment of the present invention wherein a transfer roll is utilized to apply the coating substance.
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate a preferred embodime~t of the invention, in one form thereof, and such exemplifications are not to be construed as limiting the ~cope of the invention in any manner.
Accordin~ to Fig. 1, the web W runs through a press gap formed between two rolls 1 and 2. Coordinated with roll 1, which is provided with a rubberized surface, is an applicator mechanism that features a nozzle chamber 6 and, on its discharge end, a rotary doctor 7 provided with peripheral or helical grooYing and a holder 8 for the latter. The hardness of the rubber coatin~ of roll 1 may range between 0 and ~00, preferably between lO and 70, P u.J. The amount of coatins applied in the f~rst coating layer in the case of cardboard is dimensioned to be 6 to 40 ml/m2, preferably 12 to 22 ml/m2. The second coat may be applied using a comparable arranyement with rotary doctor ll and its holder 12, along with a nozzle chamber 9, but where the equalizing element may also be a blade or a smooth rotary doctor at the point lO.
The applicable consistencies, i.e., solid substance contents, range for the first coat between 5~ and 70% maximum, and for the second coat between 60 and 70~ maximum. It has been found to be favorable to provide for the applicator mechanism a nozzle chamber 6, q on the discharge end of which, near the surface to be coated, a rotary doctor 7, 11 with its holder 8, 12 is arranged. ~h~s, the advantage here i5, over the airbrush method, that the process may be performed with a relatively high consistency overall, but especially for the second coat. The line pressures in the press gap between the two first rolls 1 and 2 range betwe~n 5 and 60 kN/m, preferably 20 to 40 kN/m.
The setup according to Fig. 2 has only two web support rolls 21 and 22, with an applicator device of the described type coordinated with each. This arrangement is possible in the case of cardboard because it stretches less than paper due to the moistening in the coater.
3 ~
A favorable option in th~ case of cardboard i5 providing on the leaving end of the nozzle chamber 9 as dosing element for the second coat (final dosing) a rotary doctor 11 provided with peripheral grooving and a holder 12~ and to omit a further smoothing element thereafter. This is illustrated in Fig. 3.
With this setup, a very good coating can be obtained at relatively sparing use of coating substance.
Illustrated additionally, in Fig. 4, for the second coating device is a transfer ro]l 17 for the coating substance that may be used as well. A scraping by means of one of the known dosing elements is to be provided thereafter.
In a specific application area, in the case of sizing application for paper, it i5 possible to dose the first coat also with a blade or a suitable lath, instead of a rotary doctor provided with grooves, but the action of the blade needs to be very closely monitored here.
While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles.
Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to whi~h this invention pertains and which fall within the limits of the appended claims.
Claims (16)
1. A process for coating a running web of paper or cardboard, comprising:
providing at least one rotatable roll having a shell surface for the support of the web during a first coating process;
providing at least one rotatable roll for the support of the web during a second coating process;
applying by way of a rotary doctor to the shell surface of the rotatable roll of the first coating process a small dosed quantity of a first coating substance, said rotary doctor having closely adjacent fine peripheral grooves or helical grooves, said first coating substance having a solid or pigment substance content, said solid substance content being maximally 70%;
passing the web through a press gap formed between a backing roll and the rotatable roll of the first coating process wherein the dosed quantity of the first coating substance is pressed on the web as it passes through the press gap so that at least a thin layer of said first coating substance covers the web, specifically with regard to said solid or pigment content; and applying a second coating substance to the web during said second coating process, at least said second coating substance being dosed and applied directly on the web, wherein said second coating substance is applied in direct succession to the first layer one upon the other while the first layer is still moist.
providing at least one rotatable roll having a shell surface for the support of the web during a first coating process;
providing at least one rotatable roll for the support of the web during a second coating process;
applying by way of a rotary doctor to the shell surface of the rotatable roll of the first coating process a small dosed quantity of a first coating substance, said rotary doctor having closely adjacent fine peripheral grooves or helical grooves, said first coating substance having a solid or pigment substance content, said solid substance content being maximally 70%;
passing the web through a press gap formed between a backing roll and the rotatable roll of the first coating process wherein the dosed quantity of the first coating substance is pressed on the web as it passes through the press gap so that at least a thin layer of said first coating substance covers the web, specifically with regard to said solid or pigment content; and applying a second coating substance to the web during said second coating process, at least said second coating substance being dosed and applied directly on the web, wherein said second coating substance is applied in direct succession to the first layer one upon the other while the first layer is still moist.
2. The process of Claim 1, wherein said solid substance content of the first coating substance ranges between 50% and 60%.
3. The process of Claim 1, wherein the quantity of first coating substance applied in the first coating layer amounts to between 6 and 40 ml/m2.
4. The process of Claim 3, wherein said quantity of first coating substance amounts to between 12 and 22 ml/m2.
5. The process of Claim 1, wherein the second layer of coating substance is dosed on the roll supporting the web during the second coating process by a rotary doctor provided with peripheral grooves, whereafter the web is deflected by said support roll, said second coating substance having a solid substance content amounting to maximally 70%.
6. The process of Claim 5, wherein said solid substance content of the second coating substance ranges between 60% and 70%.
7. The process of Claim 1, wherein the second coating substance has a solid substance content that is at least 10%
higher, in absolute terms, than the solid substance content of the first coating substance.
higher, in absolute terms, than the solid substance content of the first coating substance.
8. The process of Claim 1, wherein the process is applied in the manufacture of coated cardboard.
9. A process for coating a running web of paper or cardboard, comprising:
providing at least one rotatable roll having a shell surface for the support of the web during a first coating process;
providing at least one rotatable roll for the support of the web during a second coating process;
applying by way of a doctor blade to the shell surface of the rotatable roll of the first coating process a small dosed quantity of a first coating substance, said first coating substance having a solid or pigment substance content, said solid substance content being maximally 70%;
passing the web through a press gap formed between a backing roll and the rotatable roll of the first coating process wherein the dosed quantity of the first coating substance is pressed on the web as it passes through the press gap so that at least a thin layer of said first coating substance covers the web, specifically with regard to said solid or pigment content; and applying a second coating substance to the web during said second coating process, at least said second coating substance being dosed and applied directly on the web, wherein said second coating substance is applied in direct succession to the first layer one upon the other while the first layer is still moist.
providing at least one rotatable roll having a shell surface for the support of the web during a first coating process;
providing at least one rotatable roll for the support of the web during a second coating process;
applying by way of a doctor blade to the shell surface of the rotatable roll of the first coating process a small dosed quantity of a first coating substance, said first coating substance having a solid or pigment substance content, said solid substance content being maximally 70%;
passing the web through a press gap formed between a backing roll and the rotatable roll of the first coating process wherein the dosed quantity of the first coating substance is pressed on the web as it passes through the press gap so that at least a thin layer of said first coating substance covers the web, specifically with regard to said solid or pigment content; and applying a second coating substance to the web during said second coating process, at least said second coating substance being dosed and applied directly on the web, wherein said second coating substance is applied in direct succession to the first layer one upon the other while the first layer is still moist.
10. The process of Claim 9, wherein the first coating substance is applied by a lath.
11. The process of Claim 1, in which line pressures are generated in said press gap between the backing roll and the rotatable roll, wherein said line pressures range between 5 and 60 kN/m.
12. The process of Claim 11, wherein said line pressures range between 20 and 40 kN/m.
13. A device for coating a running web, comprising:
at least one rotatable roll having a shell surface for the support of the web during a first coating process;
a backing roll situated generally axially parallel to and in closely spaced relationship to said roll supporting the web during the first coating process so that a press gap is formed therebetween;
first applicator means for applying to the shell surface of the roll of the first coating process a small dosed quantity of a first coating substance, said first applicator means including a nozzle chamber having a discharge end near the roll shell surface through which said first coating substance is passed, said first applicator means further including a holder and a rotary doctor arranged at said discharge end, said rotary doctor having closely adjacent fine peripheral grooves or helical grooves, said first coating substance having a solid or pigment substance content, said solid substance content being maximally 70%;
means for passing the web through said press gap wherein the dosed quantity of the first coating substance is pressed on the web so that at least a thin layer of said first coating substance covers the web, specifically with regard to said solid or pigment content;
second applicator means for applying a layer of a second coating substance directly on said web during a second coating process, said second layer being applied in direct succession to the first layer one upon the other while the first layer is still moist, said second applicator means including a nozzle chamber having a discharge end through which the second coating substance is passed, said second applicator means further including a holder and a rotary doctor arranged at said discharge end near the surface to be coated.
at least one rotatable roll having a shell surface for the support of the web during a first coating process;
a backing roll situated generally axially parallel to and in closely spaced relationship to said roll supporting the web during the first coating process so that a press gap is formed therebetween;
first applicator means for applying to the shell surface of the roll of the first coating process a small dosed quantity of a first coating substance, said first applicator means including a nozzle chamber having a discharge end near the roll shell surface through which said first coating substance is passed, said first applicator means further including a holder and a rotary doctor arranged at said discharge end, said rotary doctor having closely adjacent fine peripheral grooves or helical grooves, said first coating substance having a solid or pigment substance content, said solid substance content being maximally 70%;
means for passing the web through said press gap wherein the dosed quantity of the first coating substance is pressed on the web so that at least a thin layer of said first coating substance covers the web, specifically with regard to said solid or pigment content;
second applicator means for applying a layer of a second coating substance directly on said web during a second coating process, said second layer being applied in direct succession to the first layer one upon the other while the first layer is still moist, said second applicator means including a nozzle chamber having a discharge end through which the second coating substance is passed, said second applicator means further including a holder and a rotary doctor arranged at said discharge end near the surface to be coated.
14. The device of Claim 13, wherein at least the rotatable roll supporting the web during the first coating process is coated with a layer of rubber or rubber-like material that features a hardness between 0 and 200 P u.J.
15. The device of Claim 14, wherein said layer of rubber or rubber-like material features a hardness between 10 and 70 P
u.J.
u.J.
16. The device of Claim 13, including at least one rotatable roll for the support of the web during the second coating process, wherein said second applicator means is provided on said roll supporting the web during the second coating process, said roll being coordinated with the roll supporting the web during the first coating process.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4002256.0 | 1990-01-26 | ||
| DE4002256A DE4002256A1 (en) | 1990-01-26 | 1990-01-26 | Cardboard web coating - has grooved roller spreader and web guide roller to give thin in layer of coating mass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2035061A1 true CA2035061A1 (en) | 1991-07-27 |
Family
ID=6398818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002035061A Abandoned CA2035061A1 (en) | 1990-01-26 | 1991-01-28 | Coating process and applicator device for coating running webs of paper or cardboard |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0438743B1 (en) |
| JP (1) | JPH04313360A (en) |
| AT (1) | ATE95585T1 (en) |
| BR (1) | BR9006678A (en) |
| CA (1) | CA2035061A1 (en) |
| DE (2) | DE4002256A1 (en) |
| ES (1) | ES2044390T3 (en) |
| FI (1) | FI905757A (en) |
| NO (1) | NO176676C (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4211401A1 (en) * | 1992-04-04 | 1993-10-07 | Voith Gmbh J M | Coating device for webs of paper or cardboard |
| FI93885C (en) * | 1992-05-21 | 1995-06-12 | Valmet Paper Machinery Inc | Coating device for coating a roll of glue press, paper or board |
| DE4224717B9 (en) * | 1992-07-27 | 2004-08-19 | Mitsubishi Hitec Paper Bielefeld Gmbh | Process for producing a pressure sensitive recording sheet |
| FI93665C (en) * | 1992-11-13 | 1995-05-10 | Valmet Paper Machinery Inc | Method and apparatus for coating a paper web |
| WO1994023127A1 (en) * | 1993-04-06 | 1994-10-13 | Veitsiluoto Oy | A method of coating paper and an apparatus therefor |
| DE4414949A1 (en) * | 1994-04-28 | 1995-11-02 | Voith Gmbh J M | Device for applying at least one liquid medium to a running web of material |
| DE19508178A1 (en) * | 1995-03-09 | 1996-09-12 | Draiswerke Gmbh | Process and plant for treating coating color when applied to a paper web |
| DE19606459A1 (en) * | 1996-02-21 | 1997-08-28 | Voith Sulzer Papiermasch Gmbh | Methods and devices for applying a liquid or pasty medium to a running web of material |
| DE19623622A1 (en) * | 1996-06-13 | 1997-12-18 | Voith Sulzer Papiermasch Gmbh | Method and device for coating a running material web |
| DE29610395U1 (en) * | 1996-06-13 | 1996-08-22 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Device for the sequential application of two layers of liquid or pasty media on one side of a running material web |
| FI110274B (en) | 1996-11-04 | 2002-12-31 | Metso Paper Inc | Method and apparatus for coating a moving cardboard web |
| DE19827030A1 (en) * | 1998-06-17 | 1999-12-23 | Voith Sulzer Papiertech Patent | Application device |
| DE19958109A1 (en) * | 1999-12-02 | 2001-06-07 | Voith Paper Patent Gmbh | Assembly for the indirect coating of a moving paper/cardboard web has structured peripheral positions and peripheral angles around the transfer roller for an effective and consistent surface coating action |
| DE10126365A1 (en) * | 2001-05-30 | 2002-12-05 | Voith Paper Patent Gmbh | To coat a moving paper/cardboard web on both sides, a coating is applied indirectly to one side to give a shallow penetration depth, and coated indirectly on the other side with a greater penetration depth |
| PL422374A1 (en) * | 2017-07-27 | 2019-01-28 | Kartonex Spółka Z Ograniczoną Odpowiedzialnością | Method for impregnation of corrugated board and the set of devices for impregnation of corrugated board |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2870738A (en) * | 1957-02-28 | 1959-01-27 | Black Clawson Co | Paper coating machine |
| US3202536A (en) * | 1961-11-08 | 1965-08-24 | Beloit Corp | Method and apparatus for coating paper |
| EP0352465A3 (en) * | 1988-07-27 | 1990-10-10 | J.M. Voith GmbH | Application device for coating moving webs, and coating process |
-
1990
- 1990-01-26 DE DE4002256A patent/DE4002256A1/en not_active Withdrawn
- 1990-11-06 NO NO904827A patent/NO176676C/en unknown
- 1990-11-21 FI FI905757A patent/FI905757A/en not_active IP Right Cessation
- 1990-12-20 ES ES90124884T patent/ES2044390T3/en not_active Expired - Lifetime
- 1990-12-20 EP EP90124884A patent/EP0438743B1/en not_active Revoked
- 1990-12-20 DE DE90124884T patent/DE59003011D1/en not_active Revoked
- 1990-12-20 AT AT90124884T patent/ATE95585T1/en active
- 1990-12-21 BR BR909006678A patent/BR9006678A/en not_active Application Discontinuation
-
1991
- 1991-01-17 JP JP3017055A patent/JPH04313360A/en active Pending
- 1991-01-28 CA CA002035061A patent/CA2035061A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| NO176676C (en) | 1995-05-10 |
| ATE95585T1 (en) | 1993-10-15 |
| NO904827L (en) | 1991-07-29 |
| BR9006678A (en) | 1991-10-01 |
| DE59003011D1 (en) | 1993-11-11 |
| JPH04313360A (en) | 1992-11-05 |
| FI905757A (en) | 1991-07-27 |
| EP0438743B1 (en) | 1993-10-06 |
| FI905757A0 (en) | 1990-11-21 |
| EP0438743A1 (en) | 1991-07-31 |
| ES2044390T3 (en) | 1994-01-01 |
| NO904827D0 (en) | 1990-11-06 |
| NO176676B (en) | 1995-01-30 |
| DE4002256A1 (en) | 1991-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19950729 |