EP0071149A1 - Dispositif de dosage du poids de couches de revêtement sur une bande en mouvement - Google Patents

Dispositif de dosage du poids de couches de revêtement sur une bande en mouvement Download PDF

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Publication number
EP0071149A1
EP0071149A1 EP82106497A EP82106497A EP0071149A1 EP 0071149 A1 EP0071149 A1 EP 0071149A1 EP 82106497 A EP82106497 A EP 82106497A EP 82106497 A EP82106497 A EP 82106497A EP 0071149 A1 EP0071149 A1 EP 0071149A1
Authority
EP
European Patent Office
Prior art keywords
web
scraper
inlet
flank
inlet flank
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
EP82106497A
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German (de)
English (en)
Other versions
EP0071149B1 (fr
Inventor
Reinhard Esser
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.)
Esser Reinhard
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT82106497T priority Critical patent/ATE16031T1/de
Publication of EP0071149A1 publication Critical patent/EP0071149A1/fr
Application granted granted Critical
Publication of EP0071149B1 publication Critical patent/EP0071149B1/fr
Expired 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
    • D21H23/32—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
    • 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
    • B05C11/04—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 with blades
    • 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
    • B05C11/04—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 with blades
    • B05C11/045—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 with blades characterised by the blades themselves
    • 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

Definitions

  • the invention relates to a device for adjusting the wet application weight of coatings on material webs, in particular of conventional pigment dispersions on paper or cardboard webs.
  • the dry application weights are between 5 and 35 g / sqm.
  • the coatings are usually made from an aqueous dispersion with different dry matter contents, so that the wet application weights are considerably higher. It has proven to be expedient first to apply an excess of coating material to the running material web and then to remove it again from the surface by means of metering devices, the aim being at the same time to smooth the coating surface.
  • metering devices include roller applicators in connection with metering rollers, so-called reverse roll coaters, roller scraper metering devices, also known as squeegees, and smoothing scraper devices, better known under the abbreviation Blade.
  • D is the coated material web by _ a support means, carried, for example, a roll and exerted by the metering unit, as blade or doctor blade, a pressure to the web, which counteracts the coating composition.
  • a coating device is described in US Pat. No. 2,051,403, in which the essential part consists in the formation of the scraper.
  • This curved scraper designed in a special shape has two different radii in the course of its curvature.
  • the end of the inlet flank is not a sharp edge, but rounded, because sharp edges should lead to a faulty surface and unsatisfactory results.
  • the subsequent inlet flank is convexly curved and has a larger radius than the radius of curvature of the rounded edge.
  • US Pat. No. 1 925 092 describes a wiper device which is directed against a freely guided web, the web being guided a little around the curved inlet flank of the wiper up to its sharp-edged end.
  • the scraper inevitably serves as a web guide and deflection element at the same time.
  • the gap that forms is limited by the convex curved surface of the wiper and the concavely curved coated surface of the web. Since the running web is discharged tangentially from the sharp end edge of the scraper, it is not possible to set a defined inlet gap.
  • the geometry of the inlet gap that forms does not only depend on the web speed, but also on the amount and the rheological properties of the coating composition and on the elongation behavior of the paper web. The gap geometry is therefore not defined by the device, but is more or less undefined depending on the respective process conditions and cannot be set.
  • the known metering devices are unsatisfactory in particular if, in order to achieve high application weights, the known blade blades are applied to the web with a small angle of attack and low contact pressure. Under these conditions, a wiping surface or zone forms, in which wipers abut the web surface. A condition very soon arises in which blade forces sometimes cannot withstand the higher color printing and a different application weight arises across the web. Even slight deviations in straightness, due to manufacturing tolerances or other causes lead to considerable fluctuations in the order quantities across the web after dosing. Attempts have been made to improve the straightness by supporting, for example, the blade with the help of pressure hoses. These results are unsatisfactory, especially with larger web widths.
  • LWC paper L W C is derived from lightweight coated
  • they are up to 1,300 m / min. with application weights up to 10 g / qm and side
  • cardboard for example, up to 250 m / min. with application weights of approx. 30 g / qm per side and for so-called art paper up to 600 m / min, with application weights of approx. 25 g / qm and side.
  • the object of the invention is therefore to provide a stripping device which makes it possible to set the wet application weight on coated webs with great accuracy, by controlling the hydrodynamic pressure of the coating material between the running web and the fixed stripper.
  • a device for regulating the application weight of coatings on material guided in the running web in particular paper or cardboard webs with a roller supporting the running web on the uncoated side, which has a radius of 150-500 mm and an elastic surface has a hardness of 82-34 units Shore A and a scraper which is at rest during the action on the coating, which has a curved infeed flank on the infeed side, the end of which adjoins the web is sharp-edged and the scraper over the contact point to the Material web is designed as a pivot point.
  • the rigid scraper has a concave curved inlet flank with a radius of curvature equal to or slightly smaller or larger than the radius of curvature of the support roller and the length of the inlet flank is 10-250 mm.
  • the advantage of the inventive design of the metering device is that the geometry of the inlet gap between the support roller and the scraper is fixed for every angle of the scraper and at the end of the inlet gap there is a narrow contact line and no contact zone of the scraper is formed when this is applied with pressure the web is pressed on, which is sufficient to compensate for the hydrodynamic pressure of the coating color. Apart from the angle of attack, the gap geometry is therefore independent of the particular process conditions during dosing.
  • the radius of the support roller (2) is 150-500 mm, depending on the working width, whereby larger working widths generally require larger radii in order to avoid deflections.
  • the support roller (2) has an elastic covering on a hard core. Synthetic rubber types or synthetic polymers with the necessary elasticity are suitable for this.
  • the surface hardness of the backup roller can be determined using various measuring methods. Pusey & Johnes plastometers (P + J. units, measured with the 1/8 "ball) or Shore hardness measuring devices (Shore A, measured with truncated cone) are commonly used.
  • FIG. 2 shows an embodiment of the scraper (5), in which a steel sheet (11) is inserted into the inlet flank (7), which can be replaced if necessary. '
  • a steel sheet (11) is inserted into the inlet flank (7), which can be replaced if necessary.
  • the scraper is placed with the end of the inserted steel sheet on the web surface and this support line serves as the axis of rotation for the scraper.
  • the blade (11), preferably made of spring steel, inserted into the inlet flank (7) should rest on the scraper (5) over the entire surface and be held in this position. According to one embodiment, this can be done in that the inlet flank (7) has an undercut groove (10), engage in the punching tongues (12) of the steel sheet and hold the blade under tension.
  • other fastening and holding devices can also be used, provided that the sheet is held in flat contact with the curved inlet flank (7) of the scraper (5).
  • Figure 3 shows the arrangement of the punch tongues (12) in the steel sheet (11) in the middle at a distance from each other.
  • Figure 4 shows a further embodiment of the scraper (5) in which a sealing strip (13) is arranged and fastened to the scraper (5) as a wear element and forms the final edge (6) of the scraper (5). Since the actually scraping edge is very narrow, the end strip (13) can be chosen so thin that no grinding corresponding to the radius of curvature of the inlet flank (7) is required. It is sufficient and possible to use square strips made of a correspondingly abrasion-resistant material. Such materials are, for example, steel alloys, particularly hard steel alloys or other abrasion-resistant materials.
  • the coating color also contains the necessary proportions of dispersing aid defoamer and other customary additives.
  • the coating system has the arrangement shown in Figure 1.
  • the web width is 315 cm.
  • a design according to FIG. 2 with an inserted sheet of spring steel is used as the scraper.
  • the scraper has a concave curved inlet flank with a radius of curvature of 250 mm and is 200 mm long.
  • the support roller has a diameter of 500 mm, the surface hardness is 46 units Shore A (140 P + J. units).
  • an excess of coating material is first applied by means of a conventional dipping roller and removed again by the wiper.
  • the sharp-edged end of the stripper is pressed against the coated web surface at a flat angle with such pressure that the hydrodynamic pressure of the coating material building up in the crescent-shaped inlet gap is compensated so that in the operating state between the stripper edge and the support roller surface a narrow gap is created through which the coated web of a defined application thickness and smooth surface passes.
  • the low application weight A of 10 g / sqm is an amount for which the known blade has proven to be particularly suitable for dosing.
  • This type of scraper develops its advantages with a steep angle of attack of the blade and high contact pressure.
  • a comparable effect is achieved with the device according to the invention if the angle of attack is larger, so that a short inlet zone with pressure build-up in the coating color is formed.
  • the contact pressure should be as low as possible with regard to the design effort of the scraper support roller and its bearings in the frame, but it must be so large that at least the current web speeds of up to 1,200 m / min. build-up hydrodynamic pressure of the coating is compensated and the setting is possible with sufficient reproducibility.
  • Another advantage of the device according to the invention is that with only one device very different order weights with less fluctuations than previously common, especially possible with large working widths. In this way, the surface and transparency of the coating are achieved in a way that was previously only possible with different metering devices specially adapted to high or low application weights.
  • the advantage of the rigid scraper according to the invention with a concavely curved, long inlet flank is that it is not only easy to produce with the required accuracy without great difficulty, but can also be adjusted with great accuracy and reproducibility across the web.
  • the crescent-shaped inlet gap which is filled to a greater or lesser extent with coating compound during operation between the support roller and stripper, is of equal thickness at all points, in particular at the end edge of the stripper, and enables smaller deviations from the target weight than was possible with the previously known metering devices.

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  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Cleaning In General (AREA)
EP82106497A 1981-07-24 1982-07-19 Dispositif de dosage du poids de couches de revêtement sur une bande en mouvement Expired EP0071149B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82106497T ATE16031T1 (de) 1981-07-24 1982-07-19 Vorrichtung zur regulierung des auftragsgewichtes von beschichtungen auf in laufender bahn gefuehrtem material.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3129251 1981-07-24
DE3129251A DE3129251C2 (de) 1981-07-24 1981-07-24 Vorrichtung zur Regulierung des Auftragsgewichtes von Beschichtungen auf in laufender Bahn geführtem Material

Publications (2)

Publication Number Publication Date
EP0071149A1 true EP0071149A1 (fr) 1983-02-09
EP0071149B1 EP0071149B1 (fr) 1985-10-09

Family

ID=6137653

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82106497A Expired EP0071149B1 (fr) 1981-07-24 1982-07-19 Dispositif de dosage du poids de couches de revêtement sur une bande en mouvement

Country Status (4)

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US (1) US4471714A (fr)
EP (1) EP0071149B1 (fr)
AT (1) ATE16031T1 (fr)
DE (1) DE3129251C2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4036726C2 (de) * 1990-11-17 2001-06-28 Hauni Werke Koerber & Co Kg Beschichtungsvorrichtung
DE4304478A1 (de) * 1993-02-15 1994-08-18 Pagendarm Gmbh Auftragsvorrichtung
US5620515A (en) * 1995-05-30 1997-04-15 Inoue Kinzoku Kogyo Co., Ltd. Coating apparatus
DE29709301U1 (de) * 1997-05-27 1997-11-27 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Vorrichtung zum Befestigen von mindestens einem im wesentlichen ortsfest angeordneten dünnen, langgestreckten Funktionselement
CA2251305A1 (fr) * 1997-10-24 1999-04-24 Voith Sulzer Papiertechnik Patent Gmbh Dispositif et processus de couchage de la section humide d'une machine de production de bande de materiau, en particulier de papier ou de carton
US6306215B1 (en) 1998-03-10 2001-10-23 Valence Technology, Inc. Apparatus for coating current collectors
FI20001076A7 (fi) * 2000-05-08 2001-10-24 Berg Carl Gustav Järjestelmä ja menetelmä päällystysprosessin suureiden määrittämiseksi, menetelmä kuivatusprosessin ohjaamiseksi sekä tietokoneohjelma

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1652273A1 (de) * 1967-02-24 1970-05-14 Agfa Gevaert Ag Verfahren und Absaugesystem fuer Beschichtungsvorrichtungen zum Vermeiden der UEbertragung von Druckstoerungen auf den Beschichtungsvorgang
DE1905567A1 (de) * 1969-01-23 1970-08-27 Int Paper Co Verfahren und Vorrichtung zum Aufbringen von Tonueberzuegen auf Papiersubstrate
DE2822682A1 (de) * 1978-05-24 1979-11-29 Feldmuehle Ag Vorrichtung und verfahren zum kontinuierlichen egalisieren des striches beim beschichten von laufenden materialbahnen
EP0029865A1 (fr) * 1979-12-03 1981-06-10 ZANDERS Feinpapiere AG Dispositif et procédé pour le couchage de bandes en mouvement notamment en papier ou en carton

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2051403A (en) * 1930-07-16 1936-08-18 Warren S D Co Paper coating
US1925092A (en) * 1932-09-26 1933-09-05 John Waldron Corp Smoothing device
US2534320A (en) * 1946-05-16 1950-12-19 Champion Paper & Fibre Co Apparatus for coating paper
US3285225A (en) * 1963-05-02 1966-11-15 Beloit Corp Coating applicator
DE2417720C2 (de) * 1974-04-11 1983-01-05 Agfa-Gevaert Ag, 5090 Leverkusen Vorrichtung zum Beschichten bandförmiger Unterlagen mit flüssigen Lösungen oder Dispersionen
DE2843371C2 (de) * 1978-10-05 1985-07-11 Zanders Feinpapiere AG, 5060 Bergisch Gladbach Verfahren zum Beschichten von laufenden Bahnen aus Papier oder Karton mit üblichen Pigmentdispersionen und Vorrichtung zum Einstellen des Naßauftragsgewichtes von Beschichtungen, insbesondere zur Durchführung des Verfahrens
DE3017274C2 (de) * 1980-05-06 1985-07-18 Jagenberg-Werke AG, 4000 Düsseldorf Vorrichtung zum Streichen von Papierbahnen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1652273A1 (de) * 1967-02-24 1970-05-14 Agfa Gevaert Ag Verfahren und Absaugesystem fuer Beschichtungsvorrichtungen zum Vermeiden der UEbertragung von Druckstoerungen auf den Beschichtungsvorgang
DE1905567A1 (de) * 1969-01-23 1970-08-27 Int Paper Co Verfahren und Vorrichtung zum Aufbringen von Tonueberzuegen auf Papiersubstrate
DE2822682A1 (de) * 1978-05-24 1979-11-29 Feldmuehle Ag Vorrichtung und verfahren zum kontinuierlichen egalisieren des striches beim beschichten von laufenden materialbahnen
EP0029865A1 (fr) * 1979-12-03 1981-06-10 ZANDERS Feinpapiere AG Dispositif et procédé pour le couchage de bandes en mouvement notamment en papier ou en carton

Also Published As

Publication number Publication date
DE3129251A1 (de) 1983-02-10
DE3129251C2 (de) 1984-05-17
ATE16031T1 (de) 1985-10-15
US4471714A (en) 1984-09-18
EP0071149B1 (fr) 1985-10-09

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