EP0050879A1 - Procédé et appareil pour l'imprégnation d'une matière sous forme de nappe - Google Patents

Procédé et appareil pour l'imprégnation d'une matière sous forme de nappe Download PDF

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Publication number
EP0050879A1
EP0050879A1 EP81109310A EP81109310A EP0050879A1 EP 0050879 A1 EP0050879 A1 EP 0050879A1 EP 81109310 A EP81109310 A EP 81109310A EP 81109310 A EP81109310 A EP 81109310A EP 0050879 A1 EP0050879 A1 EP 0050879A1
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EP
European Patent Office
Prior art keywords
roller
grid
web
pressure
counter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81109310A
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German (de)
English (en)
Inventor
Helmut Bühler
Andreas Dr. Brusdeylins
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0050879A1 publication Critical patent/EP0050879A1/fr
Withdrawn legal-status Critical Current

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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
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B05C1/0808—Details thereof, e.g. surface characteristics
    • 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
    • D21H5/0025—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by contact with a device carrying the treating material
    • D21H5/003—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by contact with a device carrying the treating material with a roller
    • D21H5/0032—Details thereof, e.g. surface characteristics, peripheral speed

Definitions

  • the invention relates to a method for impregnating sheet material, in particular paper, with liquid preparations by means of a roller which transfers the liquid preparations and a counterpressure roller, the sheet material being carried out between these rollers, and an apparatus for performing this method.
  • the impregnation of sheet material with liquid preparations is usually carried out in such a way that the sheet material, e.g. Pulls paper through a tub in which the liquid preparation is stored and, if necessary, wipes off the excess by means of a doctor blade or other suitable devices.
  • a modification of this method is that the web-like material is first allowed to float on the surface of the liquid preparation in order to allow the air in the web to escape upwards. After such a swim, the lane is then pulled into and through the liquid preparation.
  • Such a technology is used, for example, in the production of paper webs impregnated with resin, in particular curable resin, for the surface treatment of wood-based panels.
  • the aqueous preparation consists of a solution or dispersion of the optionally curable resins. After impregnation, the paper web impregnated with the resin preparation is dried in suitable drying plants and then rolled up or cut to size.
  • the impregnation is made more difficult if the carrier web already has a coating which hinders the passage of air or the liquid preparation.
  • a barrier layer can consist, for example, of an already applied synthetic resin or lacquer film. It can also be caused by heavy printing on the paper.
  • the impregnation is then carried out in such a way that the side of the web opposite the barrier layer is run over an application roller rotating in the liquid preparation, the web is coated on one side with it, and then the amount of resin applied is metered by wipers, roller doctor blades or rollers.
  • To impregnate webs with a high basis weight it is customary to use two stages in succession, optionally with intermediate drying between the first and the second stage to work.
  • the time required for the impregnation of the web with a sufficient amount of substrate and the resulting maximum possible working speed in a given impregnation device depend on the one hand on the properties of the sheet material and on the other hand on those of the aqueous preparation.
  • the web-like material has different absorbency, different pore volume and different basis weight. These and other factors determine the carrier. the impregnation process. The impregnation process is also carried out over time over the properties of the liquid preparation, e.g. Viscosity, concentration, temperature and interfacial tension of the preparation are influenced. If the aqueous preparations are dispersions, the particle size and the particle size distribution of the dispersed phase play a significant role.
  • the maximum possible working speed for a given web-like material and a given liquid preparation is limited by the length of the swimming route, the diving route, the coating route and the dimensions of the tub in the impregnation device.
  • the physical properties of the carrier webs and the liquid preparations mentioned can only be changed to a limited extent in order to increase the speed, and there are also limits to an extension of the tub and thus the immersion distances in the device.
  • material defects occur, such as splitting the carrier web in the Web level, formation of cloudiness and color changes at the interface for printing, enrichment of the resin on the surface and depletion in the interior of the carrier web.
  • DE-PS 27 27 312 is a process for the production of gap-resistant, decor-side hardened synthetic resin-containing coating sheets based on thin papers, which are glued to the surfaces of wood-based panels, the solution or first on the side of the thin paper intended for decor printing Dispersion of a curable impregnating resin is applied in such amounts that the resin does not penetrate to the back of the paper, then decoratively printed after drying of the impregnated thin paper and, optionally after application of an intermediate layer, coated with the solution or dispersion of a curable resin, then dried and is cured.
  • This method is characterized in that the impregnating resin is applied to a thin paper with a basis weight of i60 g / m 2 in an amount of at least 8% (based on paper weight), but not so much that the resin breaks through, by means of the printing unit of a printing press .
  • Direct or indirect printing is suitable in the known copper gravure printing process.
  • the anilox roller is scraped off and transfers the precisely metered amount of synthetic resin directly or indirectly onto the paper web. You can also use the flexographic printing process.
  • the paper web is guided between a metal roller and a rubber roller, the rubber roller transferring the metered amount of synthetic resin to the paper web through the application unit.
  • the invention is based on the object of providing a method and a device which make it possible to carry out forced impregnation.
  • blocked carrier webs such as papers coated on one side or heavily printed, and also papers with a high basis weight both quickly and as uniformly as possible.
  • Of particular interest is the maintenance of a sufficiently and evenly impregnated, gap-resistant carrier web.
  • the device according to the invention thus differs from a coating device with metallic anilox rollers of the prior art, e.g. a gravure printing device for painting, in particular in that the cups are molded into the elastically deformable jacket and have a depth of at least 50% of the grid pitch.
  • Grid division is understood to mean the linear distance from the center of a web delimiting the well to the center of the opposite web. If the distance is e.g. 1.0 mm, 50% of the grid pitch means that the well has a depth of 0.5 mm.
  • These cells since they are separated from one another by elastically deformable webs, can be deformed by the counterpressure roller in the printing zone while reducing their volume. They form their volume behind the pressure zone.
  • the screen depth of the metallic screen rollers is 25 to 40% of the screen pitch.
  • the webs delimiting the cells are rigid, and under the line pressure of the counterpressure roller, the webs are neither compressed nor the cells deformed to reduce the volume.
  • the depth or area variable gravure elements are generated by a washout process using water after the previous coating.
  • a 0.4 mm thick plastic layer which is applied to a metal cylinder by powder coating in connection with a hardening process, is very fine, close together the lying, variable-depth spiral grooves are engraved by a modulatable laser.
  • the same effect is to be achieved when printing in gravure printing as in copper gravure printing with metallic forme cylinders, namely the application of thin and thinnest layers of gravure ink or another liquid preparation to a carrier, e.g. Paper. Therefore, in contrast to the features of the device according to the invention, the elastic layers are thin and the flat engravings are only about 0.03 mm deep.
  • the hardness of the coating is in the range of 100 Shore A, so that the webs of the cups and spirals remain stable in the pressure zone and are practically not deformed.
  • the liquid preparation which fills the wells which are molded into the elastically deformable jacket, is fed to the roller provided with a grid.
  • An excess of the liquid preparation is e.g. stripped by a squeegee.
  • the paper web is guided between the transfer roller and the counter-pressure roller and is pressed by the counter-pressure roller against the rasterized transfer roller.
  • the webs and the cups filled with the liquid preparation are pressed increasingly against the web-like material up to the middle of the pressure zone. In accordance with the increase in pressure, the webs are compressed and the wells deformed while reducing their volume.
  • the reduction in the volume of the cells is complete when an equilibrium has been established between the contact pressure of the counterpressure roller and the sum of the partial pressures from the upset pressure for the webs and the liquid pressure of the incompressible liquid preparation in the cells. Due to the high liquid pressure in the wells, the liquid preparation in the wells is pressed into the web-like material until it is saturated. The Excess remains in the well. At the same time, the air contained therein is compressed or pushed out of it during the filling of the web-like material. After passing through the center of the pressure zone, the volume of the cells increases again in accordance with the pressure relief, which creates a certain suction effect.
  • the structure of the web-like material has a throttling effect against rapid liquid movements at low pressure differences, only a small part of the liquid preparation pressed into the web can be sucked back, preferably from its surface, which results in a more uniform distribution of the liquid preparation within the cross-section of the web-like material is achieved.
  • the impregnation process over time does not correspond to the penetration capacity of the liquid preparation and the absorbency of the carrier web, but is forced in a very short time by the liquid pressure in the wells and the squeezing of the liquid preparation into the carrier web .
  • This makes it possible to impregnate even sheet-like materials that are difficult to impregnate, which are already coated on one side impermeably, or to counter impregnation with high penetration resistance.
  • the device according to the invention permits the impregnation of a carrier web at a much higher working speed than is possible with the devices for methods of the prior art.
  • the device according to the invention has the particular advantage that the so-called sieve effect is avoided.
  • a sieve effect in normal impregnation is understood to mean that the outer liquid phase is preferably first sucked up by the sheet-like material and that the disperse phase is separated according to its particle size, since the smaller particles preferentially enter the pores of the impregnating sheet material can be sucked.
  • the dispersion is pressed evenly into the pores of the sheet material and counteracts the sieving effect.
  • the elastically deformable grids of the transfer rollers of the device according to the invention preferably have geometrical shapes that differ from the rigid grids, for example pointed pyramid grids, dome grids, etc., of the known metallic anilox rolls in coating devices.
  • the cup depth which is 25 to 45% of the screen pitch in the case of metallic anilox rollers, is at least 50%, preferably 60 to 85% of the screen pitch in the case of elastically deformable screen rollers of the device according to the invention.
  • the web walls expediently form an angle of 90 to 120 ° with the well base.
  • the web surfaces should be on average 1: 1 to the cell surfaces on the jacket. Since a minimum web width is required for manufacturing reasons, the ideal ratio cannot always be achieved with fine grids.
  • the center lines of the webs should not be parallel to the roller axis, but at an angle to it, for example as a diagonal grid, diamond grid, honeycomb grid.
  • the maximum amount of liquid preparation that can be pressed into the sheet-like material is determined by the grid fineness, the web area ratio and the well depth. If a large amount of the liquid preparation is to be pressed into the web-like material, it can be advantageous to arrange a plurality of devices according to the invention, optionally with interposed dryers, one behind the other.
  • the devices according to the invention can be operated in various combinations, e.g. so that several devices one after the other impregnate the web material with different liquid preparations from the same side of the web, or so that several devices one after the other, optionally with interposed dryers, impregnate the web material first from the front and then from the back.
  • Another variation of the device according to the invention is designed such that a finely screened metallic anilox roller with a filling doctor blade is arranged as a coating roller against the elastically deformable, coarsely screened transfer roller as the counterpressure roller.
  • the web-like material is simultaneously impregnated from one side by the transfer roller and thinly coated with another liquid preparation from the other side.
  • the specialist is able to choose further variations and combinations depending on the task.
  • the transfer roller will be evenly rastered over its entire bale width. If the web-shaped material is only partially in certain areas, e.g. technical or decorative reasons, e.g. in strips, impregnated or dyed, only these areas are scanned on the surface of the jacket of the transfer roller.
  • the raw body of the transfer roller expediently consists of a rigid cylindrical core, which can be made solid or hollow, with lateral fixed, screwed or screwed shaft ends.
  • a jacket of elastically deformable material is applied to the cylindrical core by casting, gluing or another suitable application method.
  • the wall thickness of the finished man means is about 6 to 20 mm.
  • Particularly wear-resistant rubber or polyurethane with a hardness in the range from 40 to 70 Shore A have proven themselves as the jacket material.
  • the rasterization of the transfer rollers is preferably carried out on laser machines, the C0 2 - or YAG lasers of which produce the relatively deep wells and the slim webs that delimit the wells.
  • Papers in particular papers with one-sided coatings, can be used as sheet-like materials.
  • other nonwoven products e.g. Glass fiber fleece, impregnated with liquid preparations.
  • the method is also suitable for treating woven or knitted textile webs.
  • Liquid materials their solutions in water or organic solvents, and emulsions or dispersions can be used as liquid preparations.
  • liquid preparations are solutions or dispersions of optionally curable synthetic resins, solutions or dispersions of water repellents, such as e.g. Paraffin oils or silicone oils. Preparations can also be used, such as those used to treat textiles to influence the handle, absorbency, freedom from creasing and the like.
  • Printing ink solutions can be used. Solutions of compacting inorganic substances, such as e.g. Water glass.
  • the method according to the invention can be carried out, for example, with the device according to the following FIGS. 1 to 6.
  • the web-like material 1 to be impregnated here paper coated in the example, is drawn off from a supply roll 2 and fed to the impregnation device via take-off rolls 3 and deflection rolls 4.
  • the driven transfer roller 5 receives the liquid preparation 6 from a tub 7. The excess is stripped off by the doctor blade 8.
  • the counter-pressure roller 9 is pressed against the transfer roller 5 by a support roller 10.
  • the paper to be impregnated is passed between the counter-pressure roller 9 and the transfer roller 5 and fed to a sheet dryer 13 via a spreader roller 11 to prevent creasing by means of further deflection rollers 12.
  • This sheet dryer has three drying devices, e.g. Hot air nozzle dryer 14 and a cooling zone 15.
  • the impregnated and dried web-like material is then fed via a deflection roller 16 to a web tension control device 17 (e.g. dancer roller), a pair of tension rollers 18 and further deflection rollers 19 to the reeling device 20.
  • a web tension control device 17
  • FIG. 2 shows an embodiment of the device according to the invention in accordance with area II of FIG. 1.
  • the tubular inelastic core 21 of the transfer roller 5, which is driven via shaft stub 30, has a jacket 22, which is rasterized on its surface and made of an elastically deformable material with a hardness in the range from 40 to 70 Shore A.
  • the driven transfer roller 5 takes the liquid preparation 6 out of the tub 7 on.
  • the doctor blade 8 sliding over the surface of the webs 28 of the jacket 22 wipes off the excess liquid preparation. Under the contact pressure of the harder counter-pressure roller 9, the jacket 22 deforms in the area from point 23 to point 24 to point 25, the so-called pressure zone.
  • Fig. 3 section III-III
  • a well 27 is shown enlarged at the entry into the pressure zone at point 23 of FIG. 2.
  • the cup 27 is filled with the liquid preparation 6 almost up to the upper edge of the web 28.
  • the counter-pressure roller 9 brings the carrier web 1, which is provided with a coating 26 on one side, into contact with the jacket 22 of the transfer roller 5.
  • section IV-IV shows the position of the cup 27 in the middle of the pressure zone at point 24.
  • the elastic jacket 22 is compressed, the webs 28 are compressed and the cup 27 is deformed while reducing its volume.
  • the liquid preparation 6 has been pressed under high pressure into the carrier web up to the coating 26 (arrows 6 ').
  • Fig. 5 section VV
  • the unloaded well 27 is shown at the end of the pressure zone at point 25.
  • the original cup shape has already receded.
  • a certain negative pressure prevails in the well, due to the effect of which a small amount of the liquid preparation 6 returns flows (arrows 6 "), preferably from the surface of the sheet material 1.
  • FIG. 6 shows the pressure curve within a well in the area of the pressure zone from position 23 to position 25 is shown schematically.
  • the pressure of the liquid preparation increases from the beginning of the pressure zone, position 23, to the middle, position 24, and reaches its maximum there.
  • the internal pressure drops again from position 24 to position 25, a slight negative pressure being able to occur shortly before position 25. Without wishing to limit the invention thereto, they will reach maximum pressures of up to 30 bar within the well in the region of the highest pressure zone in accordance with the line pressure applied

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  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)
EP81109310A 1980-10-29 1981-10-29 Procédé et appareil pour l'imprégnation d'une matière sous forme de nappe Withdrawn EP0050879A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3040681 1980-10-29
DE19803040681 DE3040681A1 (de) 1980-10-29 1980-10-29 Vorrichtung zum impraegnieren von bahnfoermigem material

Publications (1)

Publication Number Publication Date
EP0050879A1 true EP0050879A1 (fr) 1982-05-05

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Application Number Title Priority Date Filing Date
EP81109310A Withdrawn EP0050879A1 (fr) 1980-10-29 1981-10-29 Procédé et appareil pour l'imprégnation d'une matière sous forme de nappe

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EP (1) EP0050879A1 (fr)
DE (1) DE3040681A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598102A1 (fr) * 1986-04-30 1987-11-06 Will E C H Gmbh & Co Procede et dispositif pour l'application d'une matiere fluide sur une bande
GB2213406A (en) * 1987-12-08 1989-08-16 Molins Plc Coating apparatus
AU598156B1 (en) * 1986-08-11 1990-06-14 Consolidated Papers, Inc. Method of and apparatus for controlling application of glue to defined areas
GB2294891A (en) * 1994-11-11 1996-05-15 Gd Spa Roller gumming device
WO2010018302A1 (fr) * 2008-08-11 2010-02-18 Upm-Kymmene Corporation Procédé de fabrication de papier d'impression
WO2021181246A1 (fr) * 2020-03-09 2021-09-16 Contiweb B.V. Dispositif de couchage pour humidifier un substrat plat

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019111342B4 (de) 2018-05-17 2023-06-29 Internorm Kunststofftechnik Gmbh Lackierwalze

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB772376A (en) * 1955-01-26 1957-04-10 Faesite Spa Process for the injection of liquids into sheet material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB772376A (en) * 1955-01-26 1957-04-10 Faesite Spa Process for the injection of liquids into sheet material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VERPACKUNGS-RUNDSCHAU, Band 23, Nr. 2, Februar 1972, Heusenstamm (DE) U. SARCANDER : "Möglichkeiten eines Auftragwerkes" Seiten 154-162 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598102A1 (fr) * 1986-04-30 1987-11-06 Will E C H Gmbh & Co Procede et dispositif pour l'application d'une matiere fluide sur une bande
AU598156B1 (en) * 1986-08-11 1990-06-14 Consolidated Papers, Inc. Method of and apparatus for controlling application of glue to defined areas
GB2213406A (en) * 1987-12-08 1989-08-16 Molins Plc Coating apparatus
GB2213406B (en) * 1987-12-08 1992-05-20 Molins Plc Coating apparatus and method
GB2294891A (en) * 1994-11-11 1996-05-15 Gd Spa Roller gumming device
WO2010018302A1 (fr) * 2008-08-11 2010-02-18 Upm-Kymmene Corporation Procédé de fabrication de papier d'impression
WO2021181246A1 (fr) * 2020-03-09 2021-09-16 Contiweb B.V. Dispositif de couchage pour humidifier un substrat plat
NL2025086B1 (nl) * 2020-03-09 2021-10-19 Contiweb B V Opbrenginrichting

Also Published As

Publication number Publication date
DE3040681A1 (de) 1982-06-03

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Inventor name: BRUSDEYLINS, ANDREAS, DR.

Inventor name: BUEHLER, HELMUT