US3722465A - Smoothing scraper-coating apparatus - Google Patents

Smoothing scraper-coating apparatus Download PDF

Info

Publication number
US3722465A
US3722465A US00124843A US3722465DA US3722465A US 3722465 A US3722465 A US 3722465A US 00124843 A US00124843 A US 00124843A US 3722465D A US3722465D A US 3722465DA US 3722465 A US3722465 A US 3722465A
Authority
US
United States
Prior art keywords
blade
web
leaf spring
tube
face
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 - Lifetime
Application number
US00124843A
Other languages
English (en)
Inventor
F Krautzberger
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.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
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 JM Voith GmbH filed Critical JM Voith GmbH
Application granted granted Critical
Publication of US3722465A publication Critical patent/US3722465A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors
    • 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
    • B05C11/041—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 means for positioning, loading, or deforming the blades

Definitions

  • ABSTRACT The specification discloses a scraper, or skimming, blade arrangement for controlling the thickness of a layer of coating composition deposited on a running web.
  • the blade extends pivotally attached to the rear of the frame. Part of the bed extends rearwardly the web and has one longitudinal edge fixed to a support beam on the side of the beam which faces the web.
  • An inflatable tube between the beam and the blade is expansible by fluid pressure to flex the blade into operative engagement with the web downstream from the region of supply of the coating composition to the web.
  • a leaf spring element interposed between the tube and the blade serves to distribute the pressure of the tube along the blade so that the pressure with which the blade engages the web is substantially uniform along the full length of the blade.
  • the present invention is concerned with controlling the thickness of a layer of coating composition on a running web, particularly a paper web, and is particularly concerned with a novel form of blade arrangement extending the width of the web and operable for controlling the thickness of a coating composition applied to the web.
  • Arrangements for controlling the thickness of films or layers of coating compositions applied to webs are known in the form of doctor blades and the like. It is also known to employ somewhat resilient or flexible blades which are pressed against a running web to control the thickness of a film deposited thereon. It is, furthermore, known to provide expansible backing elements, such as inflatable tubes, behind such blades in order to thrust the blades against the web being treated thereby to control the stripping off of excess coating compositions from the web.
  • One attempt to. compensate for such irregularities involves backing up the inflatable tube, on the side thereof opposite the blade which it engages, with a bearing or backing strip which is subdivided into a plurality of sections arranged in end to end relation.
  • the individual sections referred to are connected to spindles which may be operated to move the sections toward and away from the web so that individual compensating pressures of appropriate magnitude can be superimposed on the pressure exerted in respective regions along the blade by the inflated tube when the pressure of the blade on the web is non-uniform.
  • a further object is the provision of an arrangement of the nature referred to in which the pressure of the blade on the web from side to side of the web remains substantially uniform at all times and without the necessity of difficult and complex adjustment of the supporting structure for the blade.
  • a particular object is the provision of an arrangement referred to in which irregularities in the wall thickness of an inflatable element for thrusting the blade toward the web are automatically compensated for so that the pressure of the blade on the web is uniform across the entire width of the blade.
  • FIG. 1 schematically illustrates a roller coating machine having a coating thickness controlling arrangement according to the present invention
  • FIG. 2 is a sectional view showing the coating thickness controlling arrangement according to the present invention with the scraper blade of the arrangement lifted off from the web;
  • FIG. 3 is a view like FIG. 2, but shows the scraper blade pressed against the web in an operative position.
  • a scraper, or skimming, blade arrangement for use in a coating installation, such as a roller coating installation, in which the blade is in the form of a strip-like yieldable element extending transversely of the web.
  • the blade is supported along one marginal edge in a support beam in such a manner that the free edge of the blade is normally spaced from the web.
  • an inflatable member which can be inflated, as by compressed air, or
  • a leaf spring is provided between the inflatable tube and the blade and extending the whole length of the tube and curved so as to be convex toward the back of the blade.
  • the leaf spring is flexible and will yield when the inflatable tube expands so as to' press the blade toward the web.
  • the function of the leaf spring is to absorb and distribute pressure peaks occuring at any position along the length of the tube and thereby to make uniform the pressure with which the blade engages the web.
  • the sleeve may, for example, be substantially elliptical in cross sectional shape with the major axis of the ellipse extending substantially in the direction in which the tube, when expanded, moves the scraping blade.
  • the coating composition taken up from trough 1 by immersion rollers 2 and 3 is first applied to web 5 in excess, for example, to a thickness indicated at s in FIG. 1, and what coating composition does not drop from the web back into the trough 1, is conveyed by the web to a scraping apparatus, generally indicated at 7. As the coated web passes scraping apparatus 7, the film thickness is scraped, or skimmed, down to the desired uniform film thickness. The excess material removed by apparatus 7 drops back into trough l as indicated at 8 in FIG. 1.
  • the apparatus 7 may be supported on a bracket as 9 by a pivot 10 so that the apparatus can be pivoted bodily toward and away from the axis of roller 4.
  • the scraping apparatus comprises a scraper beam 10 extending parallel to the axis of roller 4 and having fixed thereto a strip-like yieldable scraper blade 13 which is clamped along its lower marginal edge to beam 11 as by clamping plate 12.
  • a strip-like yieldable scraper blade 13 Disposed on the side of blade 13 opposite the web 5 is an expansible tube 14 which may, for example, be formed of rubber or a like elastomeric material.
  • Tube 14 extends behind blade 13 over the entire width of the web and blade 13 and is supported on the side opposite blade 13 by a support strip 15.
  • Strip 15 also extends the entire length of blade 13 and is fixedly anchored in beam 11 as by screws 17 distributed along the length of strip 15.
  • a leaf spring 16 steel, for example, is provided which is clamped at its marginal portions 20 and 21 beneath strip 15 and which extends outwardly from the clamped peripheral portions in a substantially elliptical shape and in surrounding relation to strip 15 and tube 14.
  • the portion of tube 14 nearest blade 13, and indicated at 18, is the pressing zone and it will be noted that spring 16 advantageously engages both the tube and the back of blade 13 in the said pressing zone and curves backwardly away from the back of blade 13 on both sides of the pressing zone 18.
  • tube 14 is deflated and has an internal diameter designated d and it will be noted that blade 13 is at this time retracted from the surface of roller 4 and engages spring 16 but would be spaced a substantial distance from any web passing about roller 4.
  • inflatable tube 14 has been suppliedwith air under pressure and has expanded to a diameter D and has caused leaf spring 16 to expand in the longitudinal direction and to press blade 13 into engagement with the surface of a web passing about roller 4.
  • strip 15 is provided with an elon gated arcuate recess in which tube 14 is mounted so that the portion of tube 14 facing away from blade 13 is confined when the tube is in expanded condition and thereby directing the expansive force of the tube in the direction toward pressing zone 18.
  • leaf spring 16 passes around the side of the tube which faces the back of blade 13 so that the tube is substantially completely confined in a cavity defined by leaf spring 16 and the arcuate recess in strip 15 when the tube is in the expanded condition.
  • tube 14 could be made quite flexible, thereby further to diminish the influence of nonuniform wall thickness thereof.
  • leaf spring 16 can be arranged to exert a substantial retracting force on tube 14 in a direction away from roller 4, thereby to insure retraction of blade 13 away from the surface of the roller when the pressure and tube 14 is reduced.
  • tube 14 is radially expansible by air pressure and, to this end, a fluid supply fitting including a valve is provided at one or both ends of tube 14 for supplying air pressure thereto to expand the tube and for releasing air pressure therefrom to collapse the tube.
  • a beam extending in the direction of the width of said web adjacent said one face thereof, a yieldable blade I extending longitudinally along said beam on the side thereof toward said web and having one marginal edge fixed to said beam, the other marginal edge of said blade being moveable into engagement with said one face of said web directly opposite said support, a radially expansible fluid tight element extending longitudinally of said beam and located between said beam and said blade, said expansible element being operable when expanded to exert pressure on said blade in a lon-' gitudinal region thereof spaced from said one marginal edge of the blade, and a leaf spring extending longitu dinally of said beam and having a portion extending longitudinally of said blade and disposed between said expansible element and said blade, said leaf spring being connected to said beam in at least one region of the spring which is spaced from said portion thereof.
  • said beam includes a support strip thereon engaging the side of said inflatable element opposite the said blade, said leaf spring having longitudinal marginal edges fixed to said strip along regions spaced from said inflatable element and curving therefrom about said inflatable element so as to be generally elliptical in cross section.
  • said inflatable element is in the form of a tube, said support strip having a longitudinal arcuate recess facing said blade and in which said tube is disposed.
  • an apparatus for coating a running web means for supporting a web to be coated during movement of the web in the direction of the length thereof, a coating station in the apparatus operable for applying an excess of coating composition to one face of the web, and blade means in the apparatus downstream from said station adapted to engage the coated face of the web to control the thickness of said coating, said blade means blade, said leaf spring means being concave toward said tubular element, said leaf spring means being relatively freely moveable in the direction towardand away from said web to permit said flexing of said blade but being relatively stiff against bending in a direction perpendicular to said blade whereby to absorb pressure peaks along said tubular element and to distribute the pressure peaks longitudinallyof said blade.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Paints Or Removers (AREA)
US00124843A 1970-03-17 1971-03-16 Smoothing scraper-coating apparatus Expired - Lifetime US3722465A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702012598 DE2012598A1 (de) 1970-03-17 1970-03-17 Glättschaber-Streicheinrichtung

Publications (1)

Publication Number Publication Date
US3722465A true US3722465A (en) 1973-03-27

Family

ID=5765318

Family Applications (1)

Application Number Title Priority Date Filing Date
US00124843A Expired - Lifetime US3722465A (en) 1970-03-17 1971-03-16 Smoothing scraper-coating apparatus

Country Status (11)

Country Link
US (1) US3722465A (enrdf_load_stackoverflow)
JP (1) JPS5024325B1 (enrdf_load_stackoverflow)
AT (1) AT303506B (enrdf_load_stackoverflow)
CH (1) CH530284A (enrdf_load_stackoverflow)
CS (1) CS150516B2 (enrdf_load_stackoverflow)
DE (1) DE2012598A1 (enrdf_load_stackoverflow)
FR (1) FR2084745A5 (enrdf_load_stackoverflow)
GB (1) GB1330113A (enrdf_load_stackoverflow)
PL (1) PL74273B1 (enrdf_load_stackoverflow)
SE (1) SE374152B (enrdf_load_stackoverflow)
SU (1) SU476731A3 (enrdf_load_stackoverflow)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882817A (en) * 1974-01-11 1975-05-13 Black Clawson Co Doctor Blade Assembly
US4169425A (en) * 1975-12-11 1979-10-02 J. M. Voith Gmbh Apparatus for removing the surplus of coating compound in paper coating machines
US4230406A (en) * 1979-03-26 1980-10-28 Xerox Corporation Cleaning system for an electrostatic copier
JPS55148164A (en) * 1979-04-19 1980-11-18 Baldwin Gegenheimer Corp Automatic branket washer
US4257343A (en) * 1973-11-16 1981-03-24 Billeruds Aktiebolag Coating apparatus with vacuum biased doctor blade
US4290520A (en) * 1978-10-20 1981-09-22 Salgar Supplies Ltd. Conveyor belt cleaning device
US4442144A (en) * 1980-11-17 1984-04-10 International Business Machines Corporation Method for forming a coating on a substrate
US4532158A (en) * 1981-04-09 1985-07-30 St. Regis Paper Company Apparatus for and a method of metering of coating on a moving web
US4583186A (en) * 1984-03-26 1986-04-15 Bremson Data Systems Computerized video imaging system
DE3609383A1 (de) * 1986-03-20 1987-09-24 Voith Gmbh J M Einrichtung zur beschichtung von laufenden warenbahnen
US4757763A (en) * 1979-04-19 1988-07-19 Baldwin Technology Corporation Automatic blanket cylinder cleaner
US4877122A (en) * 1988-03-03 1989-10-31 Normand Morin Conveyor belt scrapers
US4907529A (en) * 1987-09-07 1990-03-13 Valnet Paper Machinery Inc. Apparatus for controlling the tilt angle of a doctor blade
US4913084A (en) * 1989-04-19 1990-04-03 Seymour Ronald P Apparatus useful in devices for controlling the thickness of coating applied to a substrate
USRE33244E (en) * 1984-03-26 1990-06-26 Bremson Data Systems Computerized video imaging system
US5431731A (en) * 1992-04-10 1995-07-11 Valmet Paper Machinery, Inc. Applicator beam in a size press
US5746833A (en) * 1994-09-16 1998-05-05 Tzn Forschungs- Und Entwicklungszentrum Unterluss Gmbh Apparatus for continuously applying a coating to a sheet of indeterminate length
US5869143A (en) * 1994-08-24 1999-02-09 Jagenberg Papiertechnik Gmbh Method and device for coating webs of material, particularly paper or cardboard webs
US6098691A (en) * 1996-12-04 2000-08-08 G D Societa Azioni Gumming device for applying adhesive to sheet material
US20140123431A1 (en) * 2011-03-25 2014-05-08 Palanisami Karunakaran Roller cleaning assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT999822B (it) * 1973-11-26 1976-03-10 Belcit Italia Spa Dispositivo per la regolazione dello spessore dello strato di sospensione di patinatura deposto su un nastro continuo di carta in una macchina patinatrice
DE3218113A1 (de) * 1982-05-13 1983-11-24 Mathias 4815 Schloss Holte Mitter Rakeleinrichtung mit rakelrolle fuer auftragseinrichtungen zum auftragen von fluessigen, verschaeumten oder pastoesen medien auf warenbahnen
CN106824667B (zh) * 2017-03-20 2019-11-01 浙江德嘉新材料有限公司 一种灯箱布的涂布装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914788A (en) * 1957-02-22 1959-12-01 D S T Pattern And Engineering Doctor knives
US3029779A (en) * 1958-10-15 1962-04-17 Beloit Iron Works Reverse bar coater
US3131092A (en) * 1961-09-06 1964-04-28 Black Clawson Co Apparatus for coating a moving web
US3229662A (en) * 1964-01-10 1966-01-18 Time Inc Blade holding apparatus
US3529315A (en) * 1969-01-27 1970-09-22 Lodding Engineering Corp Doctor blade holder
US3611471A (en) * 1968-06-19 1971-10-12 Valmet Oy Scraper device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914788A (en) * 1957-02-22 1959-12-01 D S T Pattern And Engineering Doctor knives
US3029779A (en) * 1958-10-15 1962-04-17 Beloit Iron Works Reverse bar coater
US3131092A (en) * 1961-09-06 1964-04-28 Black Clawson Co Apparatus for coating a moving web
US3229662A (en) * 1964-01-10 1966-01-18 Time Inc Blade holding apparatus
US3611471A (en) * 1968-06-19 1971-10-12 Valmet Oy Scraper device
US3529315A (en) * 1969-01-27 1970-09-22 Lodding Engineering Corp Doctor blade holder

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4257343A (en) * 1973-11-16 1981-03-24 Billeruds Aktiebolag Coating apparatus with vacuum biased doctor blade
US3882817A (en) * 1974-01-11 1975-05-13 Black Clawson Co Doctor Blade Assembly
US4169425A (en) * 1975-12-11 1979-10-02 J. M. Voith Gmbh Apparatus for removing the surplus of coating compound in paper coating machines
US4290520A (en) * 1978-10-20 1981-09-22 Salgar Supplies Ltd. Conveyor belt cleaning device
US4230406A (en) * 1979-03-26 1980-10-28 Xerox Corporation Cleaning system for an electrostatic copier
US4757763A (en) * 1979-04-19 1988-07-19 Baldwin Technology Corporation Automatic blanket cylinder cleaner
JPS55148164A (en) * 1979-04-19 1980-11-18 Baldwin Gegenheimer Corp Automatic branket washer
US4442144A (en) * 1980-11-17 1984-04-10 International Business Machines Corporation Method for forming a coating on a substrate
US4532158A (en) * 1981-04-09 1985-07-30 St. Regis Paper Company Apparatus for and a method of metering of coating on a moving web
USRE33244E (en) * 1984-03-26 1990-06-26 Bremson Data Systems Computerized video imaging system
US4583186A (en) * 1984-03-26 1986-04-15 Bremson Data Systems Computerized video imaging system
DE3609383A1 (de) * 1986-03-20 1987-09-24 Voith Gmbh J M Einrichtung zur beschichtung von laufenden warenbahnen
US4738877A (en) * 1986-03-20 1988-04-19 J. M. Voith, Gmbh Apparatus for coating moving strips of material
US4907529A (en) * 1987-09-07 1990-03-13 Valnet Paper Machinery Inc. Apparatus for controlling the tilt angle of a doctor blade
US5048667A (en) * 1988-03-03 1991-09-17 Morin Normand J Conveyor-belt scraper
US4877122A (en) * 1988-03-03 1989-10-31 Normand Morin Conveyor belt scrapers
US4913084A (en) * 1989-04-19 1990-04-03 Seymour Ronald P Apparatus useful in devices for controlling the thickness of coating applied to a substrate
US5431731A (en) * 1992-04-10 1995-07-11 Valmet Paper Machinery, Inc. Applicator beam in a size press
US5869143A (en) * 1994-08-24 1999-02-09 Jagenberg Papiertechnik Gmbh Method and device for coating webs of material, particularly paper or cardboard webs
US5746833A (en) * 1994-09-16 1998-05-05 Tzn Forschungs- Und Entwicklungszentrum Unterluss Gmbh Apparatus for continuously applying a coating to a sheet of indeterminate length
US6098691A (en) * 1996-12-04 2000-08-08 G D Societa Azioni Gumming device for applying adhesive to sheet material
US20140123431A1 (en) * 2011-03-25 2014-05-08 Palanisami Karunakaran Roller cleaning assembly
US9205448B2 (en) * 2011-03-25 2015-12-08 Mak Engineering Projects Pty Limited Roller cleaning assembly

Also Published As

Publication number Publication date
JPS5024325B1 (enrdf_load_stackoverflow) 1975-08-14
SE374152B (enrdf_load_stackoverflow) 1975-02-24
CH530284A (de) 1972-11-15
GB1330113A (en) 1973-09-12
SU476731A3 (ru) 1975-07-05
CS150516B2 (enrdf_load_stackoverflow) 1973-09-04
FR2084745A5 (enrdf_load_stackoverflow) 1971-12-17
AT303506B (de) 1972-11-27
PL74273B1 (enrdf_load_stackoverflow) 1974-10-30
DE2012598A1 (de) 1971-10-21

Similar Documents

Publication Publication Date Title
US3722465A (en) Smoothing scraper-coating apparatus
US3450098A (en) Doctor for paper-making machine
US4245582A (en) Adjustable rod holder for metering rod coaters
EP0453427B1 (en) Method for limitation of the width of coating in coating of paper or board and a device intended for carrying out the method
US3081191A (en) Doctor blade
US4440105A (en) Paper coating apparatus having a replaceable orifice plate
US4167914A (en) Rotating rod, rotating press roll nip coating apparatus
US3701335A (en) Coating apparatus for sheet material
KR860001661B1 (ko) 화운틴 코우터의 엔드댐 밀봉 수단
US4076864A (en) Method and apparatus for coating both sides of a moving web
US3683851A (en) Apparatus for regulating the thickness of a coating on sheet material
US2861541A (en) Device for coating a traveling sheet
US3703019A (en) Surface conforming wear resistant doctor blade for rolls
US2874674A (en) Apparatus for coating
FI64962B (fi) Foerfarande och anordning foer kontinuerlig belaeggning av ettark saerskilt en papper- eller pappbana
US4038130A (en) Corrugating machine having self-adjusting web guides
GB2067102A (en) Applying liquid to cloth
JP3035832B2 (ja) ロッド式塗工装置
US4510863A (en) System adapted to distribute a viscous substance
GB1598236A (en) Ink metering apparatus
US5766350A (en) Applicator system for a web-coating apparatus
US4337721A (en) Processing hot melt adhesive
JPH0640648A (ja) 紙またはボール紙の移動中にウェブをコーティングする装置
FI91903C (fi) Pidin päällystyssauvan kehtoa tai päällystysterää varten
US3919974A (en) Hot melt extrusion apparatus