US3707400A - Method of gas wiping wire emerging from a hot-dip coating bath - Google Patents

Method of gas wiping wire emerging from a hot-dip coating bath Download PDF

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Publication number
US3707400A
US3707400A US101661A US3707400DA US3707400A US 3707400 A US3707400 A US 3707400A US 101661 A US101661 A US 101661A US 3707400D A US3707400D A US 3707400DA US 3707400 A US3707400 A US 3707400A
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US
United States
Prior art keywords
wire
gas
jet
coating
bath
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
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US101661A
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English (en)
Inventor
Mahlon A Harvey
Charles D Stricker
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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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Publication of US3707400A publication Critical patent/US3707400A/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/185—Tubes; Wires

Definitions

  • This invention is concerned with dip coating of wire, and particularly relates to a method for effecting improved control of the coatings as the wire emerges from the dipping bath.
  • the invention is specifically concerned with an improved method and apparatus for providing smooth, uniform coatings on wire or tubular products by means of a gas knife.
  • the figure is a sectional view of a device for practicing the invention.
  • the invention will be described in its application to metallic hot-dip coating, although it will be apparent that the principles employed are equally applicable to other types of dip coating, in which, for example, the wire to be coated may be passed through (1) a molten resin, to provide a plastic coating; (2) through oil, to provide a protective lubricant; or (3) through paint.
  • metallic hot-dip coatings may be controlled on flat strip by passing the strip between opposed straightedge gas jets, the jets forming a gas barrier region for wiping the coating. While these systems are effective in controlling both coating Weight and smoothness and have permitted strip speeds to be increased appreciably over those using roll wiping methods, the gas knife application of coatings to wire has not been entirely satisfactory. Since gas is a compressible fluid and since the lateral motion of the moving wire cannot be completely costrained, the exact location of the barrier region (the zone of most intense wiping) will fluctuate to some extent. In such prior art devices, the barrier region position changes rapidly and easily over a small distance since the gas jets have generally surrounded the strand in such a manner that they were open in the direction of entry and exit of the strand.
  • the effective mass of the vibrating wiping system is significantly increased.
  • the wiping ring becomes part of a vibrating system with a much lower frequency of vibration than a free jet, thereby providing a smoothening effect on the close-spaced irregularities.
  • a preferred embodiment of the device for performing the instant invention is shown in cross-section in the figure.
  • the device consists of bushing I, inserted in housing 2. Orifice opening 3 is adjustably controlled by the depth to which the bushing is inserted (screwed) into the housing.
  • the lower end 4 of the bushing has an outside diameter somewhat less than that of the body of the bushing, to provide an equalizing chamber 5.
  • Cylindrical screen 6 further improves gas distribution. Gas enters through supply pipes 7, fills chamber 5, thus equalizing the pressure of the gas impinging around the perimeter of wire W, forming a gas barrier to wipe the coating liquid from the wire.
  • Pipe 8 is connected to the bottom of the housing to provide closed chamber 9 by either dipping below the surface of the bath 10 or by interconnecting with bath container (not shown). In the preferred embodiment as illustrated in the figure, the pipe is connected to a bell of larger diameter 11 to provide chamber 9 with an increased volume, thereby increasing the mass of the resonating system.
  • the instant method was satisfactorily employed in the hot dip galvanizing of steel wire.
  • the heaviest galvanized wire coatings now produced by the hot dip method are coatings of about 1 oz./ft. Class B (-2 oz./ft. and Class C (-3 ob./ft. coatings are now produced commercially only by electrolytic methods.
  • the instant method in addition to enabling the use of line speeds of up to 350 ft./min. provides uniform, controlled hot-dip galvanized coatings to be produced within the whole range of commercial coatings, i.e., from 0.1 to 3.0 oz./ft.
  • the volume of the chamber should not be excessively large, otherwise extremely high amplitude oscillations will result with severe changes in wiping effectiveness, thus causing coating weight variations over the total length of the wire.
  • the choice of distance between the bath and wipe zone is also determined in part by factors such as bath temperature and permissible heat loss from the coating liquid as well as by mechanical factors such as spacing requirements for the pass line stabilizing rolls.
  • a variety of gases, such as air, steam, inert gases, and products of fuel combustion may be employed as the in a range of about 30 degrees in either direction from the perpendicular.
  • gases such as air, steam, inert gases, and products of fuel combustion
  • the'term substantially perpendicular includes an impingement angle within :30 of the perpendicular, i.e., an arc of 60.
  • a non-oxidizing gas Zinc, for example, oxidizes with the use of either air or steam. The oxidized particles increase the viscosity of the molten zinc and thereby impede its flow under the action of the gas knife. As a result, high viscosity material tends to build up in thick rings about the wire just below the region of maximum wiping. While detrimental efiects of this nature can sometimes be alleviated by increasing the temperature of the coating liquid, it is preferable to use a non-oxidizing gas, since temperature increases may also increase the oxidation rate.
  • al/Z/Z R C should read a ZnR C same column 15, line 29,

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
US101661A 1970-12-28 1970-12-28 Method of gas wiping wire emerging from a hot-dip coating bath Expired - Lifetime US3707400A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10166170A 1970-12-28 1970-12-28

Publications (1)

Publication Number Publication Date
US3707400A true US3707400A (en) 1972-12-26

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ID=22285776

Family Applications (1)

Application Number Title Priority Date Filing Date
US101661A Expired - Lifetime US3707400A (en) 1970-12-28 1970-12-28 Method of gas wiping wire emerging from a hot-dip coating bath

Country Status (6)

Country Link
US (1) US3707400A (https=)
AU (1) AU3720971A (https=)
BE (1) BE777076A (https=)
DE (1) DE2164273A1 (https=)
FR (1) FR2119996B1 (https=)
IT (1) IT950517B (https=)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827398A (en) * 1972-02-18 1974-08-06 Siemens Ag Apparatus for tinning electrical circuit wires and the like
US3870015A (en) * 1973-10-23 1975-03-11 Anchor Hocking Corp Method and apparatus for applying plastisol coating of uniform thickness to glass containers
US4107357A (en) * 1975-09-16 1978-08-15 Nippon Steel Corporation Method for effecting one side molten metal plating
US4287238A (en) * 1980-04-11 1981-09-01 Bethlehem Steel Corporation Protective atmosphere gas wiping apparatus and method of using
EP0038975A1 (en) * 1980-04-11 1981-11-04 Bethlehem Steel Corporation Gas wiping apparatus and method of using
JPS56156747A (en) * 1980-04-11 1981-12-03 Bethlehem Steel Corp Improved method and apparatus for wiping hot dip metal coating
US4421054A (en) * 1980-04-11 1983-12-20 Bethlehem Steel Corporation Apparatus for preventing surface blemishes on aluminum-zinc alloy coatings
JPS63317655A (ja) * 1980-04-11 1988-12-26 ビーアイイーシー　インターナショナル　インコーポレイテッド 熱浸漬被覆された針金材料
US5017407A (en) * 1988-08-24 1991-05-21 Australian Wire Industries Pty. .Limited Stabilisation of jet wiped wire
US5061522A (en) * 1988-09-13 1991-10-29 Australian Wire Industries Pty. Limited Jet wiping apparatus and process
US5066519A (en) * 1988-08-24 1991-11-19 Australian Wire Industries Pty. Limited Jet wiping nozzle
US5651819A (en) * 1993-06-24 1997-07-29 The Idod Trust Continuous tube forming and coating
US5814126A (en) * 1994-01-12 1998-09-29 Cook; Thomas H. Method and apparatus for producing bright and smooth galvanized coatings
US20090215377A1 (en) * 2008-02-22 2009-08-27 Process Air Solutions, Llc Low Pressure Blow-Off Assemblies and Related Methods
US20100324621A1 (en) * 2006-10-11 2010-12-23 Imad Libbus Transcutaneous neurostimulator for modulating cardiovascular function

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU559752B2 (en) * 1982-12-24 1987-03-19 Sumitomo Electric Industries, Ltd. Hot-dipping an elongated body

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827398A (en) * 1972-02-18 1974-08-06 Siemens Ag Apparatus for tinning electrical circuit wires and the like
US3870015A (en) * 1973-10-23 1975-03-11 Anchor Hocking Corp Method and apparatus for applying plastisol coating of uniform thickness to glass containers
US3968279A (en) * 1973-10-23 1976-07-06 Anchor Hocking Corporation Method for applying plastisol coating of uniform thickness to glass containers
US4107357A (en) * 1975-09-16 1978-08-15 Nippon Steel Corporation Method for effecting one side molten metal plating
US4310572A (en) * 1980-04-11 1982-01-12 Bethlehem Steel Corporation Method for wiping hot dip metallic coatings
JPS63317655A (ja) * 1980-04-11 1988-12-26 ビーアイイーシー　インターナショナル　インコーポレイテッド 熱浸漬被覆された針金材料
EP0038975A1 (en) * 1980-04-11 1981-11-04 Bethlehem Steel Corporation Gas wiping apparatus and method of using
JPS56156747A (en) * 1980-04-11 1981-12-03 Bethlehem Steel Corp Improved method and apparatus for wiping hot dip metal coating
JPS56156746A (en) * 1980-04-11 1981-12-03 Bethlehem Steel Corp Protective atomospheric gas wiping apparatus and use thereof
EP0039422A3 (en) * 1980-04-11 1981-12-16 Bethlehem Steel Corporation Method of preventing defects in aluminium-zinc alloy coatings obtained by a hot-dip process, and apparatus therefor
US4287238A (en) * 1980-04-11 1981-09-01 Bethlehem Steel Corporation Protective atmosphere gas wiping apparatus and method of using
US4339480A (en) * 1980-04-11 1982-07-13 Bethlehem Steel Corporation Gas wiping apparatus and method of using
US4421054A (en) * 1980-04-11 1983-12-20 Bethlehem Steel Corporation Apparatus for preventing surface blemishes on aluminum-zinc alloy coatings
EP0038036A1 (en) * 1980-04-11 1981-10-21 Bethlehem Steel Corporation Protective atmosphere gas wiping apparatus and method of using
US5017407A (en) * 1988-08-24 1991-05-21 Australian Wire Industries Pty. .Limited Stabilisation of jet wiped wire
US5066519A (en) * 1988-08-24 1991-11-19 Australian Wire Industries Pty. Limited Jet wiping nozzle
US5061522A (en) * 1988-09-13 1991-10-29 Australian Wire Industries Pty. Limited Jet wiping apparatus and process
US5651819A (en) * 1993-06-24 1997-07-29 The Idod Trust Continuous tube forming and coating
US5860204A (en) * 1993-06-24 1999-01-19 The Idod Trust Continuous tube forming and coating
US5814126A (en) * 1994-01-12 1998-09-29 Cook; Thomas H. Method and apparatus for producing bright and smooth galvanized coatings
US20100324621A1 (en) * 2006-10-11 2010-12-23 Imad Libbus Transcutaneous neurostimulator for modulating cardiovascular function
US20090215377A1 (en) * 2008-02-22 2009-08-27 Process Air Solutions, Llc Low Pressure Blow-Off Assemblies and Related Methods
US8216033B2 (en) 2008-02-22 2012-07-10 Process Air Solutions, Llc Low pressure blow-off assemblies and related methods

Also Published As

Publication number Publication date
DE2164273A1 (de) 1972-07-13
BE777076A (fr) 1972-06-21
FR2119996A1 (https=) 1972-08-11
AU3720971A (en) 1973-06-28
IT950517B (it) 1973-06-20
FR2119996B1 (https=) 1977-01-28

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AS Assignment

Owner name: USX CORPORATION, A CORP. OF DE, STATELESS

Free format text: MERGER;ASSIGNOR:UNITED STATES STEEL CORPORATION (MERGED INTO);REEL/FRAME:005060/0960

Effective date: 19880112