EP0523144A1 - Process for two-faced coating of a travelling web. - Google Patents

Process for two-faced coating of a travelling web.

Info

Publication number
EP0523144A1
EP0523144A1 EP91907563A EP91907563A EP0523144A1 EP 0523144 A1 EP0523144 A1 EP 0523144A1 EP 91907563 A EP91907563 A EP 91907563A EP 91907563 A EP91907563 A EP 91907563A EP 0523144 A1 EP0523144 A1 EP 0523144A1
Authority
EP
European Patent Office
Prior art keywords
web
transfer rollers
process according
speed
racterized
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
EP91907563A
Other languages
German (de)
French (fr)
Other versions
EP0523144B1 (en
Inventor
Tore Eriksson
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.)
BTG Eclepens SA
BTG Kalle Inventing AB
Original Assignee
BTG Eclepens SA
BTG Kalle Inventing AB
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 BTG Eclepens SA, BTG Kalle Inventing AB filed Critical BTG Eclepens SA
Publication of EP0523144A1 publication Critical patent/EP0523144A1/en
Application granted granted Critical
Publication of EP0523144B1 publication Critical patent/EP0523144B1/en
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
    • 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
    • B05C9/04—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 liquid or other fluent material to opposite sides 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
    • 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
    • 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

Definitions

  • the present invention relates to a process for two- faced coating of a travelling web, for example a paper web, while using two juxtaposed transfer roller between which the web travels with deposition of coating agent on both surfaces of the web.
  • metering coating liquid onto a roller examples include coaters using metering by means of blades or by means of rotary bars.
  • the present invention therefore has for an object to provide an improved process for two-faced coating of a travelling web while using two juxtaposed transfer rollers between which the web travels with deposition of coating agent on both sides of the web.
  • the invention is based on the principle that the transfer rollers are imparted mutu ⁇ ally different peripheral speeds, at least one of said pe ⁇ ripheral speeds deviating from the the speed by which the web is fed.
  • the process according to the in- vention is characterized by the fact that both transfer rollers in connection with the position of engagement with the web move in the same direction and in the same direc ⁇ tion as the web.
  • both peripheral speeds of the transfer rol ⁇ lers deviate from the speed of the travelling web, and it is particularly preferred that the peripheral speed of one of the transfer rollers exceeds the speed of the web, whereas the peripheral speed of the other transfer roller is lower than the speed of the web. In this connection it is preferred that the peripheral speeds of the transfer rollers deviate from the speed of the web at about the same degree.
  • the process according to the invention operates with a roller pressure in the nip be ⁇ tween the juxtaposed transfer rollers lower than that which is commonly used, and it is preferred that the transfer rollers are set at an engagement pressure in the nip of up to about 10 N/mm. It is also preferred to use rollers which are made of a soft material, for example rubber, and to use transfer rollers having a surface hardness of at most about 60 Shore A. For the purpose to obtain a certain feeding effect for the web it is suitable to bring same to an extended engagement against the transfer roller the peripheral speed of which exceeds that of the web.
  • the transfer rollers are set at an engagement pressure in the nip of from about 1 to about 10 N/mm and that transfer rollers are used having a surface hardness of at most about 60 Shore A.
  • the technique according to the present invention is particularly suitable for the coating of travelling paper webs.
  • the coating device illustrated in the drawing and generally indicated 1 comprises two transfer rollers 3 and 5, both rotating in the direction indicated by arrows a). Between these two transfer rollers 3,5 a paper web 7 is fed in the direction indicated by arrow b). Transfer rollers 3,5 are supplied with coating composition by means of applicators 13 and 15, respectively, and excess of coating composition 21,23 is returned to containers 17,19. Metering rollers 9,11 are rotated in a direction indicated by arrows c) and they have a speed which is significantly lower than the rotational speed of transfer rollers 3,5. As is clear from the drawing paper web 7 is fed in such a manner as to come into engagement with the mantel surface of the upper roller over a sector segment cor ⁇ responding to about 30° of the circumference. The engage ⁇ ment against the lower roller is theoretically along a line but in view of the softness of the rollers somewhat larger than the theoretic engagement.
  • the surprising improvement of the coating obtained by the process according to the present invention is above all related to the so called film-split effect which cau ⁇ ses orange peel pattern in the layer applied.
  • the low en- gagement pressure enables differences in the peripheral speeds of transfer rollers 3,5, on the one hand in rela ⁇ tion to each other, on the other hand in relation to the travelling speed of paper web 7.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Coating Apparatus (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Control Of El Displays (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Powder Metallurgy (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

A process for two-faced coating of a travelling web (7) by means of two juxtaposed transfer rollers (3, 5) while depositing a coating agent on both sides of the web (7), the transfer rollers (3, 5) being imparted mutually different peripheral speeds, at least one of said speeds deviating from the speed of the web (7), both transfer rollers (3, 5) and web (7) moving in the same direction.

Description

PROCESS FOR TWO-FACED COATING OF A TRAVELLING WEB
The present invention relates to a process for two- faced coating of a travelling web, for example a paper web, while using two juxtaposed transfer roller between which the web travels with deposition of coating agent on both surfaces of the web.
General techniques in coating and sizing of paper consists in metering the coating liquid in a roller nip formed between two rollers which are in engagement against each other. In the so called size press technique the coa¬ ting liquid is supplied directly into the nip, and this technique is commonly used mainly in the so called surface sizing of paper. According to other known variants of roller coaters the coating agent is transferred indirectly to the paper by being first metered onto a press roller, so called transfer roller. The pre-metered liquid film is then transferred to the paper web without the formation of excess of coating agent in the press nip. An example of this technique is the so called gate roller coater which comprises two juxtaposed pressure rollers between which the web travels for levelling out the coating agent. These two press rollers are flanked on either side of roller pairs by means of which coating agent is transferred onto the mantel surfaces of press rollers and from said sur¬ faces to the paper web.
Other examples for metering coating liquid onto a roller are coaters using metering by means of blades or by means of rotary bars.
However, the above described known techniques are subject to certain draw-backs, among which there may be mentioned uneven dosage, the formation of orange peel pattern in view of the so called film-split effect etc. Therefore, there is a need for new improved technique concerning the coating of travelling webs, particularly paper webs. The present invention therefore has for an object to provide an improved process for two-faced coating of a travelling web while using two juxtaposed transfer rollers between which the web travels with deposition of coating agent on both sides of the web. The invention is based on the principle that the transfer rollers are imparted mutu¬ ally different peripheral speeds, at least one of said pe¬ ripheral speeds deviating from the the speed by which the web is fed. In addition, the process according to the in- vention is characterized by the fact that both transfer rollers in connection with the position of engagement with the web move in the same direction and in the same direc¬ tion as the web.
In a preferred embodiment of the process according to the invention both peripheral speeds of the transfer rol¬ lers deviate from the speed of the travelling web, and it is particularly preferred that the peripheral speed of one of the transfer rollers exceeds the speed of the web, whereas the peripheral speed of the other transfer roller is lower than the speed of the web. In this connection it is preferred that the peripheral speeds of the transfer rollers deviate from the speed of the web at about the same degree.
Even if the degree of deviation from the speed of the web is not particularly critical it is preferred that it does not exceed about 5%, and a preferred range concerning deviation of peripheral speed is from about 0,5 to about 2,5%.
In order to obtain optimum result while avoiding the draw-backs of the prior art the process according to the invention operates with a roller pressure in the nip be¬ tween the juxtaposed transfer rollers lower than that which is commonly used, and it is preferred that the transfer rollers are set at an engagement pressure in the nip of up to about 10 N/mm. It is also preferred to use rollers which are made of a soft material, for example rubber, and to use transfer rollers having a surface hardness of at most about 60 Shore A. For the purpose to obtain a certain feeding effect for the web it is suitable to bring same to an extended engagement against the transfer roller the peripheral speed of which exceeds that of the web.
In summary it is particularly preferred that the transfer rollers are set at an engagement pressure in the nip of from about 1 to about 10 N/mm and that transfer rollers are used having a surface hardness of at most about 60 Shore A.
The technique according to the present invention is particularly suitable for the coating of travelling paper webs.
The invention will in the following be further de¬ scribed by a non-limiting example in conjunction with the appended drawing which in a side view diagramatically shows a coating device for applying process according to the invention.
The coating device illustrated in the drawing and generally indicated 1 comprises two transfer rollers 3 and 5, both rotating in the direction indicated by arrows a). Between these two transfer rollers 3,5 a paper web 7 is fed in the direction indicated by arrow b). Transfer rollers 3,5 are supplied with coating composition by means of applicators 13 and 15, respectively, and excess of coating composition 21,23 is returned to containers 17,19. Metering rollers 9,11 are rotated in a direction indicated by arrows c) and they have a speed which is significantly lower than the rotational speed of transfer rollers 3,5. As is clear from the drawing paper web 7 is fed in such a manner as to come into engagement with the mantel surface of the upper roller over a sector segment cor¬ responding to about 30° of the circumference. The engage¬ ment against the lower roller is theoretically along a line but in view of the softness of the rollers somewhat larger than the theoretic engagement.
In the described example there is used a relatively soft rubber in the material forming the surface of trans- fer rollers 3,5 and the hardness is about 50 Shore A. The nip pressure between the rollers is about 5N/mm. Further¬ more, the rollers are driven with peripheral speeds devi¬ ating from the speed of the web in that transfer roller 3 has a peripheral speed exceeding that of paper web 7 by about 1,5%, whereas the peripheral speed of transfer rol¬ ler 5 is somewhat lower than that of paper web 7 by about 1,5. In view of the extended engagement against transfer roller 3 a certain feeding effect of the paper web 7 will be obtained, whereas the differences in speed given advan- tageous levelling effect on both sides of paper web 7.
The surprising improvement of the coating obtained by the process according to the present invention is above all related to the so called film-split effect which cau¬ ses orange peel pattern in the layer applied. The low en- gagement pressure enables differences in the peripheral speeds of transfer rollers 3,5, on the one hand in rela¬ tion to each other, on the other hand in relation to the travelling speed of paper web 7.

Claims

1. A process for two-faced coating of a travelling web by means of two juxtaposed transfer rollers while de¬ positing a coating agent on both sides of the web, charac¬ terized in that the transfer rollers are imparted mutually different peripheral speeds, and that at least one of said speeds deviates from the web speed, both transfer rollers and web moving in the same direction.
2. A process according to claim 1, characterized in that both peripheral speeds of the transfer rollers devi¬ ate from the speed of the travelling web.
3. A process according to claim 2, characterized in that the peripheral speed of one of the transfer rollers exceeds that of the web, whereas the peripheral speed of the other transfer roller is lower than that of the web.
4. A process according to claim 3, characterized in that both peripheral speeds deviate from the speed of the web at about the same degree.
5. A process according to any of claims 2 to 4, cha¬ racterized in that the deviation of the peripheral speeds from the speed of the web is up to about 5%.
6. A process according to claim 5, characterized in that said deviation lies within the range about 0.5 to about 2.5%.
7. A process according to any preceding claim, cha¬ racterized in that the transfer rollers are subjected to an engagement pressure in the nip of up to about 10 N/mm.
8. A process according to any preceding claim, cha¬ racterized in that the transfer rollers have a surface hardness of up to about 60 Shore A.
9. A process according to any of claim 3 to 8, cha- racterized in that the web is brought to an extended engagement against the transfer roller the peripheral speed of which exceeds that of the web, whereby a certain feeding effect will be obtain.
10. A process according to claim 3, 4 or 5, charac- terzied in that the transfer rollers are set at an en¬ gagement pressure in the nip of from about 1 to about 10 N/mm, and that the transfer rollers have a surface hard¬ ness of not more than about 100 P&J.
11. A process according to any preceding claim, cha¬ racterized in that it is used for two-sided coating of a travelling paper web.
EP91907563A 1990-04-03 1991-03-18 Process for two-faced coating of a travelling web Expired - Lifetime EP0523144B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9001219 1990-04-03
SE9001219A SE465709B (en) 1990-04-03 1990-04-03 PROCEDURE APPLIES DUPLEXIC COATING OF A CURRENT COURT BY TWO OPPOSED TRANSFER ROLLS
PCT/SE1991/000206 WO1991015306A1 (en) 1990-04-03 1991-03-18 Process for two-faced coating of a travelling web

Publications (2)

Publication Number Publication Date
EP0523144A1 true EP0523144A1 (en) 1993-01-20
EP0523144B1 EP0523144B1 (en) 1995-05-10

Family

ID=20379084

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91907563A Expired - Lifetime EP0523144B1 (en) 1990-04-03 1991-03-18 Process for two-faced coating of a travelling web

Country Status (7)

Country Link
EP (1) EP0523144B1 (en)
JP (1) JP3010068B2 (en)
AT (1) ATE122269T1 (en)
DE (1) DE69109670T2 (en)
FI (1) FI106934B (en)
SE (1) SE465709B (en)
WO (1) WO1991015306A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4243518C2 (en) * 1992-12-22 1996-03-28 Feldmuehle Ag Stora Devices for applying liquid to both sides of a material web and method for applying a liquid to a material web with these devices
DE19511050A1 (en) * 1995-03-25 1996-09-26 Voith Sulzer Papiermasch Gmbh Method and device for producing a paper web having a CF layer
FR2746264B1 (en) * 1996-03-25 1998-05-22 Picardie Lainiere METHOD FOR MANUFACTURING THERMAL-STICKING LINING AND THERMAL-STICKING LINING THUS OBTAINED
EP0799934A1 (en) * 1996-04-03 1997-10-08 Voith Sulzer Papiermaschinen GmbH Process and apparatus for applying a CB coat on a paper web
CA2325906A1 (en) * 1997-10-31 1999-05-14 James L. Chance High speed coating apparatus and method
WO2002051556A1 (en) * 2000-12-22 2002-07-04 Tarkett Sommer S.A. Method for indirect thin-layer coating and device therefor
ITMI20010265A1 (en) * 2001-02-09 2002-08-09 Ind Cartarie Tronchetti Spa APPARATUS AND METHOD FOR APPLYING A FLUID TO A PAPER TAPE
FI110957B (en) * 2001-12-10 2003-04-30 Metso Paper Inc Method and apparatus for forming a multilayer coating
SE529814C2 (en) 2006-04-11 2007-11-27 Mattssonfoeretagen I Uddevalla Wire-engraved engraving roll and method of making it
DE102006044822A1 (en) * 2006-09-20 2008-04-03 Voith Patent Gmbh Process for producing a coated paper, cardboard or other fibrous web

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8001814A (en) * 1980-03-27 1981-10-16 Stork Brabant Bv METHOD AND APPARATUS FOR COATING A POROUS SUBSTRATE
DE3417487A1 (en) * 1984-05-11 1985-11-21 J.M. Voith Gmbh, 7920 Heidenheim DEVICE FOR APPLYING A LIQUID ON A RUNNING TRAIN
GB2213406B (en) * 1987-12-08 1992-05-20 Molins Plc Coating apparatus and method
GB8904112D0 (en) * 1989-02-23 1989-04-05 Wiggins Teape Group Ltd Process for applying microcapsule-containing compositions to paper

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9115306A1 *

Also Published As

Publication number Publication date
SE9001219A (en) 1991-10-04
WO1991015306A1 (en) 1991-10-17
DE69109670D1 (en) 1995-06-14
JPH05505971A (en) 1993-09-02
SE465709B (en) 1991-10-21
EP0523144B1 (en) 1995-05-10
FI924374A (en) 1992-09-29
FI924374A0 (en) 1992-09-29
FI106934B (en) 2001-05-15
JP3010068B2 (en) 2000-02-14
ATE122269T1 (en) 1995-05-15
DE69109670T2 (en) 1995-09-07
SE9001219D0 (en) 1990-04-03

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