EP0063618B1 - Kantenabschlussvorrichtung für einen Papierüberzugsapparat - Google Patents

Kantenabschlussvorrichtung für einen Papierüberzugsapparat Download PDF

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Publication number
EP0063618B1
EP0063618B1 EP19810103064 EP81103064A EP0063618B1 EP 0063618 B1 EP0063618 B1 EP 0063618B1 EP 19810103064 EP19810103064 EP 19810103064 EP 81103064 A EP81103064 A EP 81103064A EP 0063618 B1 EP0063618 B1 EP 0063618B1
Authority
EP
European Patent Office
Prior art keywords
web
edge dam
dam assembly
elements
grooves
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.)
Expired
Application number
EP19810103064
Other languages
English (en)
French (fr)
Other versions
EP0063618A1 (de
Inventor
Wayne A. Damrau
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.)
NewPage Wisconsin System Inc
Original Assignee
Consolidated Papers Inc
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 Consolidated Papers Inc filed Critical Consolidated Papers Inc
Priority to EP19810103064 priority Critical patent/EP0063618B1/de
Priority to AT81103064T priority patent/ATE14681T1/de
Priority to DE8181103064T priority patent/DE3171672D1/de
Publication of EP0063618A1 publication Critical patent/EP0063618A1/de
Application granted granted Critical
Publication of EP0063618B1 publication Critical patent/EP0063618B1/de
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
    • D21H23/40—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 only one side of the paper being in contact with the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
    • B05C3/125—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length the work being a web, band, strip or the like
    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0266—Coating heads with slot-shaped outlet adjustable in length, e.g. for coating webs of different width
    • 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
    • D21H5/0015—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 only one side of the paper being in contact with the treating medium, e.g. paper carried by support

Definitions

  • the present invention relates to an improved edge dam assembly for use with an applicator for applying a coating liquid to a web of moving paper carried on a movable support, wherein the applicator is of a type having a body portion defining a chamber therein with an elongate opening thereto positionable below, adjacent to and transversely of the web, the chamber receiving coating liquid and directing the same upwardly through the opening and onto the web, and wherein said edge dam assembly is of the type comprising seal means at each end of the opening mountable in the opening below the web for sealing along side surfaces thereof with the body portion on opposite sides of the opening and for extending at upper surfaces thereof toward the web for sealing with the web.
  • An edge dam assembly of the type indicated above is for example, known from US-A-4 250 211.
  • Such applicators may include a chamber having an opening extending across and parallel to the web, together with a doctor blade located on a trailing side of the opening for leveling the coating and a front wall extending from a leading side of the opening toward the web. Coating liquid is supplied to the chamber, and thence through the chamber opening and between the front wall and doctor blade to the web. To seal the end spaces between the front wall and doctor blade to prevent escape of coating material laterally of the web, edge dams are provided thereat.
  • the edge dams may comprise a flexible element at each end space.
  • the edge dams absolutely prevent passage of any coating liquid therepast.
  • coating liquid often leaks past the edge dams, with the result that the backing roll of paper web edges become contaminated with coating liquid.
  • a primary object of the invention is to provide improved edge dam assemblies for paper coating applicators, which significantly decrease leakage of coating liquid therepast.
  • each said seal means extends at an upper surface thereof closely adjacent to but spaced from the web for sealing therewith, each said seal means has a plurality of spaced grooves formed therein along said side and upper surfaces thereof, the interiors of said grooves are substantially at atmospheric pressure and said grooves in said upper surface extend generally along the direction of movement of the web thereat, whereby coating liquid seeping past said seal means enters and gravitates through said grooves.
  • Fig. 1 there is indicated at 20 an applicator of a type with which an edge dam assembly, indicated at 22 and configured in accordance with one embodiment of the invention, is particularly adapted for use.
  • the applicator applies a pigment bearing liquid coating to a moving web of paper 24 carried on a resilient backing roll 26 in a direction indicated by an arrow 28, and includes a main support or housing 30 having a coating liquid chamber 32 between a front or leading wall 34 and a rear or trailing wall 36 of the support.
  • the walls extend generally transversely of and parallel to the backing roll, and taper toward an open upper end of the chamber. Coating liquid is introduced into the chamber for flowing through the opening and against the web of paper and the lower sides of the chamber are closed by side walls (not shown) extending between the front and rear walls.
  • the coating applicator is positioned closely adjacent the backing roll 26 with the opening in the upper end of the chamber 32 facing the surface of the paper web 24.
  • a flexible doctor blade 38 in a'slot 40 in the main support 30 forms a portion of the chamber rear wall, and is clamped in place against the edge dam assembly 22 and urged against the web by a pair of transversely extending air tubes 42 and 44.
  • the doctor blade levels the coating applied to the web and forms a seal at the trailing end of the applicator to prevent escape therepast of excessive amounts of coating liquid.
  • the pressure of the blade on the roll is regulated by the pressure of the air within the tube 42, the tube for this purpose resulting in an even pressure of the blade across the entire width of the paper web.
  • an edge dam assembly is positioned at each side end.
  • the edge dam assembly 22 is preferably of a plastics material such as nylon or polypropylene and includes a mounting and support member 46 through which extends a steel rod 48 for rigidity or stiffening of the assembly.
  • a plurality of quasi- triangular seal elements 50 are at one end of the support member and spacer portions 52, of a smaller size than the seal elements, separate the elements to define peripheral grooves 54 between adjacent elements.
  • the generally triangular shape of the seal elements 50 enables the edge dam assembly 22 to be mounted in the space between the doctor blade 38, the front wall 34 and the backing roll 26 toward the side of and at the opening from the chamber 32.
  • the mounting member 46 has a flange 58 received within a slot 60 in the main support 30 and releasably secured therein by a knob 62 having a threaded portion passing through an opening in the main support into clamped engagement with the flange.
  • each seal element 50 forms a separate seal with the paper web, and any coating liquid which seeps past a seal element moves into a groove 54, the interior of which is at substantially atmospheric pressure, before it encounters the following seal element.
  • the grooves thus receive and contain coating liquid which seeps past the seal elements, the flow of which must be controlled. Then, as the backing roll rotates, coating liquid in the grooves is drawn by the paper web toward the doctor blade 38 for application onto the web, which minimizes the amount of coating liquid available for leakage past the following seal elements and ultimately beyond the edge dam assembly.
  • the flow of coating liquid within the grooves is orthogonal to the direction of flow of liquid which must be controlled, so that the grooves reduce the quantity of leakage of coating liquid past the edge dam assembly to a considerably greater extent than could otherwise be accomplished with a non- grooved sealing surface.
  • the configuration and size of the edge dam assembly is important relative to the position of the doctor blade 38. That is, the seal elements 50 must be of a size to substantially fill the area defined between the doctor blade, the front wall 34 and the backing roll 26 when the doctor blade is in its doctoring position. If the seal elements are too small, coating material will leak therepast, and if too large, the doctor blade will be held from its doctoring position against the paper web.
  • the edge dam assembly includes a plurality of separate seal elements 102, adjacent ones of which are separated by spacers 104.
  • the seal elements and spacers are interleaved and supported at an end of a mounting member 106 by a rod 108 extending through aligned passages in the elements, spacers and mounting member.
  • One end of the rod is fastened to the outermost seal element, and an opposite end is threaded and provided with a knurl nut 110, which may be tightened to draw the elements, spacers and mounting member together.
  • Each seal element 102 has a pair of sealing surfaces 112 and a peripheral groove 114 between the surfaces, and each spacer 104 has an open ended notch 116 extending from an upper end thereof to a medial point therein.
  • the height of each seal element is such that its upper sealing surfaces 112 extend toward and adjacent to but slightly spaced from the paper web when the edge dam assembly 100 is mounted on the applicator main support 30, but the width of each is less than the spacing between the front wall 34 and the doctor blade 38 when the blade is doctoring the web.
  • the seal elements do not restrict blade movement against the paper web.
  • Each spacer 104 has a height equal to or less than that of the seal elements and a width greater than the distance between the front wall and doctor blade when the blade is not doctoring the paper.
  • the sides of the spacers flex inwardly to enable the blade to move to its doctoring position, and at the same time form secure seals with the blade and the front wall.
  • Figs. 5 and 6 show the positioning of the edge dam assembly 100 with respect to the paper web 24 when the assembly is mounted on the applicator main support 30.
  • the edge dam assembly operates in the same manner as does the edge dam assembly 22 to minimize leakage of coating liquid therepast.
  • the assembly is illustrated as comprising three seal elements and two spacers, more or less seal elements and spacers could be used, it being understood that since the seal elements close the notches through the spacers, formation of an efficient seal requires use of at least two seal elements.

Landscapes

  • Coating Apparatus (AREA)

Claims (8)

1. Verbesserte Kantenabschlußvorrichtung für ein Gedrät (20) zum Aufbringen einer Überzugsflüssigkeit auf einer bewegten Papierbahn (24), die von einem beweglichen Träger (26) getragen wird, wobei das Aufbringgerät (20) vom Typ mit einem Gehäuseteil (30) ist, welches eine Kammer (22) bildet, mit einer gestreckten Öffnung, die daran unterhalb angrenzend und quer zur Bahn (24) in Stellung gebracht werden kann, wobei die Kammer eine Überzugsflüssigkeit aufnimmt und diese nach oben durch die Öffnung hindurch auf die Bahn (24) lenkt, und wobei ferner die Kantenabschlußvorrichtung (22 oder 100) vom Typ ist, der eine Dichtungseinrichtung an jedem Ende der Öffnung umfaßt, welche in der Öffnung unterhalb der Bahn (24) angebracht werden kann, um längs deren Seitenoberflächen abzudichten, wobei das Gehäuseteil (30) sich auf den einander gegenüberliegenden Seiten der Öffnung befindet, und um sich an dessen Oberseiten zur Bahn hin zu erstrecken und an der Bahn (24) abzudichten, dadurch gekennzeichnet, daß:
jede Dichtungseinrichtung sich an einer Oberseite bis nahe angrenzend an die Bahn (24), jedoch im Abstand von dieser erstreckt, um an dieser abzudichten, wobei jede der genannten Dichtungseinrichtungen eine Mehrzahl von beabstandeten Rillen (54 oder 114) aufweist, die darin entlang der genannten Seite und den Oberseiten gebildet sind, wobei die Innenräume der Rillen (54 oder 114) sich im wesentlichen unter Atmosphärendruck befinden und die Rillen (54 oder 114) in den Oberseite sich allgemein entlang der Bewegungsrichtung der Bahn (24) daran erstrecken, wodurch die an der Dichtungseinrichtung vorbeisickernde Überzugsflüssigkeit durch die Rillen (54 oder 114) eintritt und durch Schwerkraft absinkt.
2. Verbesserte Kantenabschlußvorrichtung nach Anspruch 1, bei welcher die Seitenfläche und die Oberseite jeder der genannten Dichtungseinrichtungen Dichtoberflächen (50 oder 112) auf einander gegenüberliegenden Seiten der Rillen (54 oder 114) definieren, wobei die Dichtoberflächen (50 oder 112) der Oberseite sich zu der Papierbahn (24) bzw. dem beweglichen Träger (26) hin und bis nahe angrenzend daran erstrekken, jedoch von diesen beabstandet sind.
3. Verbesserte Kantenabschlußvorrichtung nach Anspruch 1, bei welcher die Rillen (54 oder 114) in allgemein parallelen Ebenen liegen.
4. Verbesserte Kantenabschlußvorrichtung nach Anspruch 1, bei welcher die genannte Dichtungseinrichtung eine Mehrzahl von allgemein ebenen ersten (50 oder 102) sowie zweiten (52 oder 104) Elementen umfaßt, die Seite an Seite derart verschachtelt sind, daß die genannten ersten (50 oder 112) und zweiten (52 oder 104) Elemente abwechseln, wobei die genannten ersten (50 oder 102) und zweiten (52 oder 104) Mehrzahlen von Elementen so dimensioniert sind, daß sie die genannte Mehrzahl von beabstandeten Rillen (54 oder 114) bilden.
5. Verbesserte Kantenabschlußvorrichtung nach Anspruch 4, bei welcher die ersten (50 oder 102) und zweiten (52 oder 104) Elemente in Ebenen liegen, welche sich allgemein parallel zur Bewegungsrichtung (28) der Bahn (24) erstrecken.
6. Verbesserte Kantenabschlußvorrichtung nach Anspruch 4 oder 5, bei welcher jedes der ersten Elemente (102) eine Umfangsrille (114) in und entlang seiner Oberseite und Seitenflächen aufweist und Dichtoberflächen (112) besitzt, die sich an der Oberseite auf den einander gegenüberliegenden Seiten der Rille (114) befinden und sich bis angrenzend an die Papierbahn (24) erstrecken, jedoch von dieser im Abstand verbleiben.
7. Verbesserte Kantenabschlußvorrichtung nach Anspruch 6, bei welche die zweiten Elemente (104) Oberflächen zur Abdichtung an dem Gehäuseteil (30) auf einander gegenüberliegenden Seiten der Kammeröffnung aufweisen.
8. Verbesserte Kantenabschlußvorrichtung nach Anspruch 7, bei welcher die zweiten Elemente (104) jeweils eine offen ausmündende Ausnehnung (116) aufweisen, die sich von ihrem einen Rand bis zu einem mittleren Punkt darin allgemein entlang den Gehäuseteilen erstreckt sowie eine Breite zwischen den Gehäuseteilen aufweist, die größer als der Abstand zwischen den Gehäuseteilen ist, wobei die genannte Aussparung (116) das Zusammendrücken der zweiten Elemente (104) derart gestattet, daß diese zwischen die Gehäuseteile dichtend eingepaßt werden können.
EP19810103064 1980-04-14 1981-04-23 Kantenabschlussvorrichtung für einen Papierüberzugsapparat Expired EP0063618B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19810103064 EP0063618B1 (de) 1981-04-23 1981-04-23 Kantenabschlussvorrichtung für einen Papierüberzugsapparat
AT81103064T ATE14681T1 (de) 1980-04-14 1981-04-23 Kantenabschlussvorrichtung fuer einen papierueberzugsapparat.
DE8181103064T DE3171672D1 (en) 1980-04-14 1981-04-23 Edge dam assembly for paper coating apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19810103064 EP0063618B1 (de) 1981-04-23 1981-04-23 Kantenabschlussvorrichtung für einen Papierüberzugsapparat

Publications (2)

Publication Number Publication Date
EP0063618A1 EP0063618A1 (de) 1982-11-03
EP0063618B1 true EP0063618B1 (de) 1985-08-07

Family

ID=8187672

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810103064 Expired EP0063618B1 (de) 1980-04-14 1981-04-23 Kantenabschlussvorrichtung für einen Papierüberzugsapparat

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4398494A (en) * 1982-02-02 1983-08-16 Beloit Corporation End dam seal for blade type fountain coaters

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3078825A (en) * 1960-04-01 1963-02-26 Rice Barton Corp Blade holder for paper coating machines
GB1166862A (en) * 1966-01-18 1969-10-15 Brittains Ltd Coating Device
US4034707A (en) * 1976-01-05 1977-07-12 Rice Barton Corporation Apparatus for coating webs
US4250211A (en) * 1978-05-31 1981-02-10 Consolidated Papers, Inc. Paper coating method and apparatus

Also Published As

Publication number Publication date
EP0063618A1 (de) 1982-11-03

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