US3670695A - Apparatus for controlling weight and distribution of a coating - Google Patents

Apparatus for controlling weight and distribution of a coating Download PDF

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Publication number
US3670695A
US3670695A US117894A US3670695DA US3670695A US 3670695 A US3670695 A US 3670695A US 117894 A US117894 A US 117894A US 3670695D A US3670695D A US 3670695DA US 3670695 A US3670695 A US 3670695A
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US
United States
Prior art keywords
substrate
header
slot
nozzle
coating
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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
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US117894A
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English (en)
Inventor
Robert W Patterson
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United States Steel Corp
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United States Steel Corp
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Publication date
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    • 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
    • B05C11/06—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 a blast of gas or vapour

Definitions

  • ABSTRACT An air knife assembly with a multiplicity of curved orifices spaced around its periphery for controlling the weight and distribution of a coating applied to a continuously moving substrate. Means are included for rotating the assembly to position any desired orifice into an operating position facing the substrate. Removable baffles prevent the flow of air to all of the knives except the one in the operating position.
  • FIG. 2A is a diagrammatic representation of FIG. 2A.
  • This invention relates to an apparatus for use in controlling the weight and distribution of a coating applied to a moving substrate. More particularly, the invention relates to an appropriate for use in a process wherein substrates of varying widths are to be coated by immersion into and withdrawal from a bath of coating material.
  • the apparatus is particularly suited for use in hot-dip" coating operations wherein a sub strate such as a steel strip, is coated with a metal, such as zinc, aluminum, tin, lead or alloys thereof.
  • the present invention provides apparatus for accomplishing control of the weight and distribution of a coating applied on a moving substrate regardless of the width of such substrate.
  • This apparatus employs fluid nozzles commonly referred to as air knives" although they are capable of use with many fluids other than air.
  • My invention overcomes this difficulty by providing a common header carrying two or more knife structures of different lengths angularly disposed in such manner that rotating the header will being one or another of the knives into operating position as required by the width of the strip being coated.
  • FIG. I is a diagrammatic elevational view showing an embodiment of the apparatus in accordance with the invention.
  • FIG. 2 is a side elevation of a multiple knife coating control assembly.
  • FIG. 2A is an elevation view of one end of an air knife external to the housing in which it is joumaled.
  • FIG. 3 is a sectional view of the four-knife assembly shown in FIG. 2 and taken along line IIIIII of FIG. 2.
  • FIG. 4 is a sectional view of a three-knife assembly.
  • FIG. 5 is a sectional view of a two-knife assembly.
  • FIG. 6 is a front view of a removable air distributing screen.
  • FIG. I shows an arrangement in accordance with the preferred embodiment of the invention utilizing a two-knife coating control assembly in a conventional steel strip galvanizing line.
  • a steel strip S passes from an annealing furnace 10 through a snout 12 of controlled atmosphere into a receptacle 13 of coating material M, which in the galvanizing operation is molten zinc.
  • the strip S leaves the bath in a vertical pass line defined by sink roll 16 and a deflector roll (not shown).
  • the strip passes coating control assemblies 18 and enters a cooling box 20 in which the strip temperature is reduced below the melting point of the coating to solidify the molten coating.
  • the coating control assemblies 18 may be supported above the coating vessel 13 in any suitable manner, one assembly on each side of the substrate pass line.
  • a tubular header section 22 is journaled in housings 23.
  • a hand wheel 25 is affixed to worm 26, the cooperating worm wheel of which is fixed to the header. Rotation of the coating control assembly brings the knife having the correct length L1, L2, or L3, etc., (FIG. 2) into the active position at the desired time.
  • Horizontal adjustment of the knives with respect to the strip may be achieved by adjusting means 27 such as a motor driven screw, or by other suitable means, which moves housings 23 perpendicularly to the strip.
  • Flexible connectors 28 and releasable couplings 29 are used to supply fluid to both ends of the coating control assemblies 18.
  • the header 22 has two or more air knives 30 attached thereto.
  • One air knife in each assembly is active and all others are inactive.
  • Each air knife comprises a throat section 31 fixed to the header, a transition section or header block 33 detachably secured to throat 31 and curved lips 34 and 35 adjustably secured to the transition section.
  • lip 34 is the lower lip.
  • a curved slot 36 is formed by lips 34 and 35.
  • the knives are so mounted that the ends of the slot curve upwardly on the active knife when rotated into the operating position adjacent the substrate.
  • Each knife structure has a removable bafile plate 38 which is inserted in a retaining slot 39 in the throat section when the knife is inactive and is removed and replaced by an air distributing screen 40 (see FIG. 6) whenever that particular knife is to be placed in the active position.
  • Air distributing screen 40 which is shown in FIG. 6, has a slightly tapered end 42 to facilitate insertion of the screen in slot 39, and a large end 43 having a hole 44 therein to facilitate removal of the screen from the slot.
  • Baffle plate 38 which is solid, has an identical exterior configuration to distributing screen 40.
  • an air distributing screen 40 is positioned in slot 39 in the active knife, and baffles 38 are positioned in the corresponding slot of all other knives.
  • the active knife is moved into position adjacent the pass line of strip S by actuating adjusting means 27.
  • Handle 25, through worm gear 26, rotates the coating control assembly until the proper length knife is in the operating position, that is, adjacent to the pass line and inclined toward the substrate between about +20 above the horizontal to about 45 below a plane normal to the pass line but preferably between 5 and 45.
  • Flexible connectors 28 are attached to both ends of header 22 by releasable couplings 29. Fluid flow is initiated from both connections. Fluid under pressure flows into the header and convergent throat section 31. Screen 40 performs the function of diffusing the fluid and causing a uniform fluid jet to issue throughout the length of slot 36.
  • coupling 29 When it becomes necessary to change knives, coupling 29 is released, the assembly is turned by means of worm gear 26, and the connector 28 is recoupled to header 22.
  • Apparatus for controlling the weight and distribution of a coating applied to a moving substrate which includes a coating control assembly located adjacent the path of travel of said substrate, said assembly comprising:
  • header section for receiving fluid under pressure and having an axis extending parallel to the surface of said sub strate
  • each nozzle having a passageway therethrough terminating in an arcuate slot at its outer end, the slot in each nozzle being of different length than the slot in each other nozzle;
  • said first-named means comprises a gear wheel fixed to said header, a gear mounted external to and engaged with said first-named gear, and a power source connected to said second-named gear whereby said apparatus can be rotated.
  • Apparatus as defined iii claim 1 further comprising means for adjusting said header in a plane normal to the path of travel of said substrate.

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  • Coating Apparatus (AREA)
  • Coating With Molten Metal (AREA)
US117894A 1971-02-23 1971-02-23 Apparatus for controlling weight and distribution of a coating Expired - Lifetime US3670695A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11789471A 1971-02-23 1971-02-23

Publications (1)

Publication Number Publication Date
US3670695A true US3670695A (en) 1972-06-20

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ID=22375385

Family Applications (1)

Application Number Title Priority Date Filing Date
US117894A Expired - Lifetime US3670695A (en) 1971-02-23 1971-02-23 Apparatus for controlling weight and distribution of a coating

Country Status (18)

Country Link
US (1) US3670695A (cs)
JP (1) JPS5424968B1 (cs)
AT (1) AT311760B (cs)
AU (1) AU470097B2 (cs)
BE (1) BE779636A (cs)
BG (1) BG21037A3 (cs)
BR (1) BR7200942D0 (cs)
CA (1) CA966651A (cs)
CS (1) CS166299B2 (cs)
DE (1) DE2207760C3 (cs)
ES (1) ES400080A1 (cs)
FR (1) FR2126259B1 (cs)
GB (1) GB1381944A (cs)
IT (1) IT949175B (cs)
NL (1) NL7202125A (cs)
PL (1) PL71094B1 (cs)
RO (1) RO60532A (cs)
ZA (1) ZA72920B (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49100134A (cs) * 1972-10-06 1974-09-21
US4041895A (en) * 1975-09-29 1977-08-16 Republic Steel Corporation Coating thickness and distribution control
US4198922A (en) * 1978-10-10 1980-04-22 United States Steel Corporation Gas barrier coating control apparatus with a readily replaceable gas orifice header segment
US4346129A (en) * 1981-03-02 1982-08-24 Republic Steel Corporation Method and apparatus for thickness control of a coating
US20130232811A1 (en) * 2010-10-26 2013-09-12 Nisshin Steel Co., Ltd. Gas wiping device
CN111455300A (zh) * 2020-06-12 2020-07-28 唐山市佳冠实业有限公司 一种热镀锌板生产用设备气流分供式气刀大梁及使用方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2114315C3 (de) * 1971-03-24 1981-11-19 Mannesmann AG, 4000 Düsseldorf Schwenkbare Düsenmesser für Anlagen zur Bandbeschichtung durch Tauchen in Schmelzbädern
AU581081B2 (en) * 1985-05-17 1989-02-09 John Lysaght (Australia) Limited Jet stripping system
RU2128715C1 (ru) * 1997-06-23 1999-04-10 Научно-производственный институт АО "Новолипецкий металлургический комбинат" Ванна для цинкования металлической полосы
DE102008058513B4 (de) * 2008-11-21 2011-03-10 Berger, Bernd, Dr.-Ing. Vorrichtung zum Entfernen von Flüssigkeit von der Oberfläche eines bewegten Bandes und Bandbearbeitungsanlage mit solch einer Vorrichtung

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US458762A (en) * 1891-09-01 Variable nozzle
US1154833A (en) * 1914-08-31 1915-09-28 Charles H Baker Spraying device.
US1980923A (en) * 1931-08-18 1934-11-13 Warren S D Co Method of and apparatus for coating paper
US2415644A (en) * 1942-11-16 1947-02-11 Harold L Austin Method and apparatus for continuously applying a coating to a web and controlling the thickness of the same
US2766720A (en) * 1952-12-11 1956-10-16 Jagenberg Werke Ag Air doctor for web coating machines
GB786657A (en) * 1954-04-21 1957-11-20 Rohm & Haas New substituted fatty acid esters
US2981223A (en) * 1960-03-31 1961-04-25 Smith Paper Mills Ltd Howard Dual air doctor for paper coating machines
US2988459A (en) * 1958-10-27 1961-06-13 American Motors Corp Apparatus and method of painting
US3406656A (en) * 1967-02-02 1968-10-22 United States Steel Corp Apparatus for controlling coating thickness

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US458762A (en) * 1891-09-01 Variable nozzle
US1154833A (en) * 1914-08-31 1915-09-28 Charles H Baker Spraying device.
US1980923A (en) * 1931-08-18 1934-11-13 Warren S D Co Method of and apparatus for coating paper
US2415644A (en) * 1942-11-16 1947-02-11 Harold L Austin Method and apparatus for continuously applying a coating to a web and controlling the thickness of the same
US2766720A (en) * 1952-12-11 1956-10-16 Jagenberg Werke Ag Air doctor for web coating machines
GB786657A (en) * 1954-04-21 1957-11-20 Rohm & Haas New substituted fatty acid esters
US2988459A (en) * 1958-10-27 1961-06-13 American Motors Corp Apparatus and method of painting
US2981223A (en) * 1960-03-31 1961-04-25 Smith Paper Mills Ltd Howard Dual air doctor for paper coating machines
US3406656A (en) * 1967-02-02 1968-10-22 United States Steel Corp Apparatus for controlling coating thickness

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49100134A (cs) * 1972-10-06 1974-09-21
US4041895A (en) * 1975-09-29 1977-08-16 Republic Steel Corporation Coating thickness and distribution control
US4198922A (en) * 1978-10-10 1980-04-22 United States Steel Corporation Gas barrier coating control apparatus with a readily replaceable gas orifice header segment
US4346129A (en) * 1981-03-02 1982-08-24 Republic Steel Corporation Method and apparatus for thickness control of a coating
US20130232811A1 (en) * 2010-10-26 2013-09-12 Nisshin Steel Co., Ltd. Gas wiping device
US9021982B2 (en) * 2010-10-26 2015-05-05 Nisshin Steel Co., Ltd. Gas wiping device
CN111455300A (zh) * 2020-06-12 2020-07-28 唐山市佳冠实业有限公司 一种热镀锌板生产用设备气流分供式气刀大梁及使用方法
CN111455300B (zh) * 2020-06-12 2024-03-19 唐山市佳冠实业有限公司 一种热镀锌板生产用设备气流分供式气刀大梁及使用方法

Also Published As

Publication number Publication date
CS166299B2 (cs) 1976-02-27
JPS5424968B1 (cs) 1979-08-24
NL7202125A (cs) 1972-08-25
IT949175B (it) 1973-06-11
BR7200942D0 (pt) 1973-05-10
CA966651A (en) 1975-04-29
DE2207760A1 (de) 1972-09-14
DE2207760B2 (de) 1980-05-14
FR2126259B1 (cs) 1975-08-29
AU470097B2 (en) 1973-08-23
AU3910872A (en) 1973-08-23
PL71094B1 (cs) 1974-04-30
RO60532A (cs) 1976-10-15
BG21037A3 (bg) 1976-01-20
ZA72920B (en) 1972-10-25
BE779636A (fr) 1972-08-21
AT311760B (de) 1973-12-10
DE2207760C3 (de) 1981-09-24
FR2126259A1 (cs) 1972-10-06
ES400080A1 (es) 1974-12-16
GB1381944A (en) 1975-01-29

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