GB2085328A - Web coating - Google Patents

Web coating Download PDF

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Publication number
GB2085328A
GB2085328A GB8130311A GB8130311A GB2085328A GB 2085328 A GB2085328 A GB 2085328A GB 8130311 A GB8130311 A GB 8130311A GB 8130311 A GB8130311 A GB 8130311A GB 2085328 A GB2085328 A GB 2085328A
Authority
GB
United Kingdom
Prior art keywords
coating
spreader
web
roll
transfer
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
GB8130311A
Other versions
GB2085328B (en
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.)
Wartsila Oy AB
Original Assignee
Wartsila Oy 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 Wartsila Oy AB filed Critical Wartsila Oy AB
Publication of GB2085328A publication Critical patent/GB2085328A/en
Application granted granted Critical
Publication of GB2085328B publication Critical patent/GB2085328B/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B1/00—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating
    • D06B1/10—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating by contact with a member carrying the treating material
    • D06B1/14—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating by contact with a member carrying the treating material with a roller
    • D06B1/145—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating by contact with a member carrying the treating material with a roller the treating material being kept in the trough formed between two or more 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
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/0005—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating
    • D21H5/0012—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by bringing paper into contact with an excess of fluids, the paper carrying away only a part of the fluid material, e.g. by passing through liquids, gases or vapours

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Seal Device For Vehicle (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Magnetic Heads (AREA)

Abstract

Both sides of a moving paper web 1 are coated by passage upwardly through the nip 3 of a pair of rotatable transfer rolls 2. A doctor blade 4 or roll 4a spreads the coating substance 8 evenly on the transfer rolls, the coating substance 8 being supplied by a duct 6 to the space between each transfer roll 2 and its associated doctor. <IMAGE>

Description

SPECIFICATION Web coating means This invention relates to means for coating both sides of a moving web, for instance a paper web, with a flowable coating substance, of the kind comprising rotatable transfer rolls for transfer of the coating substance to the web, and a coating nip between the transfer rolls in which the coating of the web is carried out.
In a known web coating means, the moving web passes downwardly through a nip between two transfer rolls, and a considerable amount of coating substance accumulates between the rolls, above the nip, to form a pond. At high web speeds, there will be instability in this pond, resulting in the generation of harmful vibrations in the web. A further drawback is an unavoidable splashing of coating substance, which causes extra maintenance work and thus lowers the profitability. In another known web coating means, disclosed in Finnish PatentApplication No. 790269, published on the 15th August 1979, the web moves vertically upwardly through a coating nip and six rolls are required, which leads to high manufacturing costs. Athird known construction, the so-called gate-roll coating means, also comprises six rolls with the web moving downwardly through the coating nip.In this construction, the whole roll set has to be renewed even if only one roll becomes worn, which raises the operational costs.
The present invention aims to provide a reliable and inexpensive means for coating both sides of a web, and which can be used at high web speeds.
According to the invention, means for coating both sides of a moving web with a flowable coating substance comprises a pair of rotatable rolls for the transfer of the coating substance to the web, a coating nip between the transfer rolls in which the coating of the web is carried out, means for moving the web upwardly through said coating nip, means to define a volume for the reception of coating substance for each transfer roll, each said volume being defined between a surface region of a transfer roll upstream of said coating nip and a respective spreader member, and means for supplying coating substance to each said volume, preferably via the upstream end of each said volume.
In use of a web coating means in accordance with the invention, coating substance is brought by each transfer roll to the coating nip, where at least one inverted pond of coating substance is formed between the transfer rolls, below the coating nip. By suitably adjusting the rate at which coating substance is taken from said volumes by the transfer rolls, the size of said inverted pond(s) can be chosen so that the forces acting thereon, namely gravity and counteracting vertical force components generated by the moving web and the transfer rolls, are in balance. The pond(s) will then remain stable without any appreciable flow-down or dripping of coating substance therefrom, and there is no need to provide a collector for surplus coating substance below the transfer rolls.
The means in accordance with the invention can be used for coating stiff webs, for example cardboard webs, the web speed then usually being lower than when coating more pliable webs, for example paper webs. However, in this case also, it is possible to regulate the supply of coating substance so that the amount of coating substance in the or each inverted pond is so small, that the latter remains stable.
Even if the or each spreader member is in the form of a roll, a web coating means in accordance with the invention remains considerably less complicated than the known gateroll coating means, but is, nevertheless, at least as efficient. By making the distance between a transfer roll and its associated spreader roll adjustable, it is possible to choose between providing a nip or a slot between the transfer roll and the spreader roll, so that the supply of coating substance to the coating nip is kept at an optimum. Furthermore, by making the line road of the nip adjustable in the longitudinal direction of a transfer roll, a uniform spreading of coating substance on the transfer roll can easily be obtained.
When the or each spreader member is in the form of a roll, the amount of coating substance supplied to a transfer roll can be effectively controlled by rotating the transfer roll and the spreader roll at different circumferential speeds. If the circumferential speed of a spreader roll is kept lower than the circumferential speed of its associated transfer roll, there is a wiping effect on the transfer roll, which reduces the amount of coating substance supplied to the transfer roll. Of course, if desired, the transfer and spreader rolls can have the same circumferential speed.
By providing the peripheral surface of at least one of the spreader rolls with recesses, such as grooves or depressions, the coating substance can be transferred to certain areas only of the web via the or each transfer roll. The recesses may extend more or less continuously around the circumference of a spreader roll, for example so that the circumferential distance between two successive recesses does not exceed the circumferential length of the recesses. By suitable arrangement of the recesses, coating substance may be transferred to the web in the form of unbroken or periodically repeated stripes, by creating a plurality of axially spaced-apart, small inverted ponds of coating substance between the transfer rolls below the coating nip.
If the web is arranged to move through one of the aforesaid volumes prior to entering the coating nip, the space required below the transfer rolls is minimised. The web can also be held more firmly by two nips against one transfer roll, so that web vibrations can effectively be eliminated or damped.
An uncomplicated and inexpensive embodiment of the web coating means in accordance with the invention is obtained by having at least one of the spreader members in the form of a flexible blade which may provide a nip with its associated transfer roll. If the line pressure at the spreader blade nip is made locally adjustable, a uniform spreading of coating substance is easily obtained.When such a flexible spreader blade is employed a favourable flow of coating substance onto the associated trans fer roll is obtained by arranging for the angle between the spreader blade and a tangent to the transfer roll, at the point of closest approach to the transfer roll of the spreader blade, to be small, for example not exceeding, and preferably less than, 20 Due to the wedge geometry the hydrodynamic pressure acts effectively in the blade nip, and relatively large amounts of coating substance can be supplied to the nip. If the angle between the flexible spreader blade and the transfer roll is adjustable, it is possible to compensate for the variation in hydrodynamic pressure resulting from different viscosities of the coating substance.
The functionally corresponding members at opposite sides of the coating nip may be substantially structurally identical. Then, both sides of the web can be coated with the same kind of coating substance. However, by adjustment of the slot width or nip pressure at each spreader member, it is possible to use different types of coating substances at opposite sides of the web.
When coating opposite sides of the web with different types of coating substances, different spreader members may be used with the two transfer rolls. For example, size may be transferred to one side of the web employing a spreader member in the form of a flexible blade associated with one transfer roll. If the other side of the web is to be coated spotwise or is to be provided with pigmented marks or the like, the coating substance may be spread on the other transfer roll by means of a spreader roll having its peripheral surface provided with recess, for example grooves or depressions.
The invention will now be described, by way of example, with reference to the accompanying drawing, in which Figures 1 to 3 are schematic side views of three different embodiments of the invention.
In Figure 1,the numeral 1 designates a web which moves upwardly through a coating nip 3 between two transfer rolls 2 which have their axes disposed horizontally and which are rotated in the directions indicated. At a surface region of each transfer roll 2 situated upstream from the coating nip 3 there is located a respective spreader member in the form of a flexible blade 4. The volume defined between each blade 4 and the confronting surface region of its associated transfer roll 2 serves to receive a liquid or paste-like coating substance 8 which is supplied to said volume from above buy a respective duct 6, so that the coating substance enters said volume via the upstream end thereof.Each blade 4 is inclined to a tangent to its associated transfer roll 2, at the point of closest approach of the blade 4 to the transfer roll, buy a small angle not exceeding 20 . Each blade 4 may be adjustably mounted relative to its associated transfer roll 2 so that at the region 5 the blade is either spaced from the surface of the roll, so that a spreader slot exists between the blade and the roll, or bears against the surface of the roll to provide a spreader nip therewith.
In use of the web coating means shown in Figure 1, the coating substance 8 is distributed onto each transfer roll 2 and spread by the respective flexible blade 4 into an even layer in the region 5. Rotation of the transfer rolls brings the layers of coating substance into the coating nip 3, where the coating substance is transferred to the running web 1.
Between the transfer rolls, below the coating nip 3, at least one small inverted pond 7 of coating substance is formed. The pond 7 may extend laterally around the edges of web 1, thus forming an undivided pond, or it is also possible to have two separate ponds 7, one on each side of the web 1. The rate of supply of the coating substance 8 to transfer rolls 2 is adjusted so that only a small pond 7 is formed.
In the embodiments shown in Figures 2 and 3, the same reference numerals have been used as in Figure 1 to designate the same or substantially the same items.
In the embodiment shown in Figure 2, one of the blades 4 of the embodiment of Figure 1 is replaced by a spreader roll 4a, and the web 1 first runs through the region 5 between one transfer roll 2 and the spreader roll 4a. Thereafter, the web runs through the coating nip 3. This embodiment requires very little space below the transfer rolls 2, since the web is fed to the transfer rolls in a generally horizontal direction or from above the rolls. In this embodiment the web itself serves to transfer coating substance from one of the regions 5 to the coating nip 3 and reduces the amount of coating substance that can drop downwards from the pond(s) 7, compared with the embodiment of Figure 1.
In the embodiment shown in Figure 3, each of the blades 4 of the embodiment of Figure 1 is replaced by a respective spreader roller 4a. This embodiment operates in substantially the same was as the embodiment of Figure 1.
In the embodiments shown in Figures 2 and 3, the or each spreader roll 4a may be adjustably mounted relative to its associated transfer roll 2, in order to provide either a slot or a nip in the region 5.
In the embodiments shown in Figures 2 and 3, the or each spreader roll 4a may be provided with recesses (not shown) in its peripheral surface. In this way a plurality of axially spaced-apart small ponds 7 may be formed between the transfer rolls 2 on one or both sides of the web 1. By careful adjustment of the supply of coating substance 8 to the aforesaid volumes, it can then be arranged to apply stripes, or even spots, of coating substance 8 to one or both sides of the web 1.
The invention is not limited to the embodiments described above with reference to the drawing, and several modifications thereof are feasible within the scope of the ensuing claims. Thus the supply of coating substance to the spreader member can be arranged by means of slit-formed nozzles, extending along the whole length, or along substantially the whole length, of the transfer rolls. A flexible spreader blade can be attached to such a supply nozzle.

Claims (12)

1. Means for coating both sides of a moving web with a flowable coating substance comprising a pair of rotatable rolls for the transfer of the coating substance to the web, a coating nip between the transfer rolls in which the coating of the web is carried out, means for moving the web upwardly through said coating nip, means to define a volume for the reception of coating substance for each transfer roll, each said volume being defined between a surface region of a transfer roll upstream of said coating nip and a respective spreader member, and means for supplying coating substance to each said volume.
2. Means according to claim 1, in which the means for supplying coating substance to each said volume is arranged to deliver coating substance to each said volume via the upstream end thereof.
3. Means according to claim 1 or 2, in which at least one of said spreader members is a spreader roll.
4. Means according to any of the preceding claim, in which each spreader member provides a nip, or defines a slot, with its associated transfer roll.
5. Means according to claim 3 or claims 3 and 4, comprising means for adjusting the circumferential speed of the spreader roll relative to the circumferential speed of the adjacent transfer roll.
6. Means according to claim 3 or 5, in which the peripheral surface of said spreader roll is provided with recesses.
7. Means according to any of the preceding claims, in which the web is arranged to pass through one of said volumes.
8. Means according to claim 1 or claims 1 and 4, in which at least one of said spreader members is a flexible spreader blade.
9. Means according to claim 8, in which the angle between the spreader blade and a tangent to the transfer roll, at the point of closest approach to the transfer roll of the spreader blade, does not exceed 20 .
10. Means according to any of the preceding claims, in which different kinds of spreader members are associated with the two transfer rolls.
11. Means for coating both sides of a moving web with a flowable coating substance, constructed and arranged substantially as herein described with reference to, and as illustrated in, Figure 1, Figure 2 or Figure 3 of the accompanying drawing.
12. A method of coating a moving web on both sides with a flowable coating substance in a means according to any of the preceding claims, comprising adjusting the rate at which coating substance is taken from said volumes by the transfer rolls, so that at least one inverted pond of coating substance is formed between the transfer rolls, below the coating nip.
GB8130311A 1980-10-08 1981-10-07 Web coating Expired GB2085328B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI803185A FI66448C (en) 1980-10-08 1980-10-08 BELAEGGNINGSANORDNING FOER BANA

Publications (2)

Publication Number Publication Date
GB2085328A true GB2085328A (en) 1982-04-28
GB2085328B GB2085328B (en) 1984-06-27

Family

ID=8513845

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8130311A Expired GB2085328B (en) 1980-10-08 1981-10-07 Web coating

Country Status (13)

Country Link
JP (1) JPS5791763A (en)
AT (1) AT381741B (en)
AU (1) AU545690B2 (en)
CA (1) CA1199489A (en)
CH (1) CH656557A5 (en)
DE (1) DE3139739A1 (en)
FI (1) FI66448C (en)
FR (1) FR2491513B1 (en)
GB (1) GB2085328B (en)
IT (1) IT1139638B (en)
NL (1) NL8104592A (en)
NO (1) NO813402L (en)
SE (1) SE452262B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2576191A1 (en) * 1985-01-23 1986-07-25 Picardie Lainiere NOVEL PRODUCT FOR HOT GLUE PRESSURE ON FLAT ITEMS AND METHOD FOR MANUFACTURING SUCH A PRODUCT
EP0310826A1 (en) * 1987-10-08 1989-04-12 Eduard Küsters Maschinenfabrik GmbH &amp; Co. KG Apparatus for delivering liquid to a vat
US5048453A (en) * 1988-09-27 1991-09-17 Btg Kalle Inventing Ab Coating device
EP0468143A1 (en) * 1990-07-24 1992-01-29 KARL MENZEL MASCHINENFABRIK GmbH & Co. Method and apparatus for impregnating a textile sheet-like material
DE9409820U1 (en) * 1994-06-17 1994-09-01 J.M. Voith AG, St. Pölten Device for applying at least one liquid medium to a running web of material
FR2746264A1 (en) * 1996-03-25 1997-09-26 Picardie Lainiere METHOD FOR MANUFACTURING THERMAL-STICKING LINING AND THERMAL-STICKING LINING THUS OBTAINED
WO1998037275A1 (en) * 1997-02-24 1998-08-27 Valmet Corporation Method for treatment of cardboard or paper, an apparatus for carrying out the method and a product by the method and means for producing the product
GB2385558A (en) * 2002-02-26 2003-08-27 Roland Man Druckmasch Varnishing apparatus with at least one forme cylinder bearing a gravure printing forme
CN113289834A (en) * 2021-05-06 2021-08-24 张淑苓 Two-sided spreading machine of timber

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413586A (en) * 1982-05-20 1983-11-08 J. M. Voith Gmbh Size press
US20170342655A1 (en) * 2016-05-25 2017-11-30 Milliken & Company Process for coating both sides of a web in one pass

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2032211A (en) * 1934-03-03 1936-02-25 Beloit Iron Works Paper coating apparatus and method
US2199228A (en) * 1936-07-16 1940-04-30 West Virginia Pulp & Paper Co Method of and apparatus for coating paper
FR861049A (en) * 1938-11-14 1941-01-30 Process for making paper suitable for printing
US2293691A (en) * 1939-10-25 1942-08-18 Distr Of Columbia Paper Mills Apparatus for coating web material
US2316202A (en) * 1940-07-31 1943-04-13 Champion Paper & Fibre Co Method for coating paper
BE552613A (en) * 1955-11-15
US3442684A (en) * 1963-11-27 1969-05-06 Int Paper Co Bent blade clay coating
DE1942351B2 (en) * 1969-08-20 1972-05-18 J.M. Voith Gmbh, 7920 Heidenheim METHOD AND DEVICE FOR APPLYING COATING MATERIAL TO A MOVING PAPER TRAIL OR THE LIKE.
SE419946B (en) * 1974-10-16 1981-09-07 Inventing Ab SET AND DEVICE FOR COATING A CURRENT COAT
CA1104812A (en) * 1976-03-23 1981-07-14 Simon L. Chu Web coating apparatus and method
US4108110A (en) * 1977-03-17 1978-08-22 Beloit Corporation Apparatus for coating both sides of a travelling web
US4198446A (en) * 1978-02-14 1980-04-15 Ncr Corporation Apparatus for the manufacture of a dual coated manifold sheet with pressure-rupturable materials
JPS54155128A (en) * 1978-05-29 1979-12-06 Nippon Steel Corp Hot dipping apparatus

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2576191A1 (en) * 1985-01-23 1986-07-25 Picardie Lainiere NOVEL PRODUCT FOR HOT GLUE PRESSURE ON FLAT ITEMS AND METHOD FOR MANUFACTURING SUCH A PRODUCT
EP0189351A2 (en) * 1985-01-23 1986-07-30 LAINIERE DE PICARDIE: Société anonyme Product heat-sealed on flat articles, and method for manufacturing it
EP0189351A3 (en) * 1985-01-23 1988-09-07 Lainiere De Picardie: Societe Anonyme Product heat-sealed on flat articles, and method for manufacturing it
EP0310826A1 (en) * 1987-10-08 1989-04-12 Eduard Küsters Maschinenfabrik GmbH &amp; Co. KG Apparatus for delivering liquid to a vat
US5048453A (en) * 1988-09-27 1991-09-17 Btg Kalle Inventing Ab Coating device
EP0468143A1 (en) * 1990-07-24 1992-01-29 KARL MENZEL MASCHINENFABRIK GmbH & Co. Method and apparatus for impregnating a textile sheet-like material
DE9409820U1 (en) * 1994-06-17 1994-09-01 J.M. Voith AG, St. Pölten Device for applying at least one liquid medium to a running web of material
FR2746264A1 (en) * 1996-03-25 1997-09-26 Picardie Lainiere METHOD FOR MANUFACTURING THERMAL-STICKING LINING AND THERMAL-STICKING LINING THUS OBTAINED
EP0797932A1 (en) * 1996-03-25 1997-10-01 Lainiere De Picardie Method to make a fusible interlining and fusible interlining obtained thereby
WO1998037275A1 (en) * 1997-02-24 1998-08-27 Valmet Corporation Method for treatment of cardboard or paper, an apparatus for carrying out the method and a product by the method and means for producing the product
GB2385558A (en) * 2002-02-26 2003-08-27 Roland Man Druckmasch Varnishing apparatus with at least one forme cylinder bearing a gravure printing forme
GB2385558B (en) * 2002-02-26 2005-08-17 Roland Man Druckmasch Varnishing apparatus
CN113289834A (en) * 2021-05-06 2021-08-24 张淑苓 Two-sided spreading machine of timber
CN113289834B (en) * 2021-05-06 2022-07-22 临沂市凯金翔木业机械有限公司 Two-sided spreading machine of timber

Also Published As

Publication number Publication date
CA1199489A (en) 1986-01-21
AT381741B (en) 1986-11-25
FI66448C (en) 1984-10-10
FI66448B (en) 1984-06-29
SE452262B (en) 1987-11-23
FR2491513B1 (en) 1986-02-14
AU545690B2 (en) 1985-07-25
FR2491513A1 (en) 1982-04-09
AU7605581A (en) 1982-04-22
SE8105970L (en) 1982-04-09
GB2085328B (en) 1984-06-27
ATA429381A (en) 1985-04-15
FI803185L (en) 1982-04-09
NO813402L (en) 1982-04-13
IT1139638B (en) 1986-09-24
NL8104592A (en) 1982-05-03
CH656557A5 (en) 1986-07-15
JPS5791763A (en) 1982-06-08
DE3139739A1 (en) 1982-05-19
IT8124387A0 (en) 1981-10-08

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