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Publication numberUS3228788 A
Publication typeGrant
Publication dateJan 11, 1966
Filing dateMay 4, 1962
Priority dateMay 4, 1962
Publication numberUS 3228788 A, US 3228788A, US-A-3228788, US3228788 A, US3228788A
InventorsAlfred Teplitz
Original AssigneeUnited States Steel Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method and apparatus for galvanizing steel strip on one side
US 3228788 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Jan. 11, 1966 TEPLlTZ 3,228,788

METHOD AND APPARATUS FOR GALVANIZING STEEL STRIP ON ONE SIDE Filed May 4, 1962 Ar/arney United States Patent 3,228,788 METHOD AND APPARATUS FOR GALVANIZING STEEL STRIP 0N ONE SIDE Alfred Teplitz, Pittsburgh, Pa., assignor to United States Steel Corporation, a corporation of New Jersey Filed May 4, 1962, Ser. No. 192,387 1 Claim. (Cl. 117-111) This invention relates to the manufacture of sheet steel galvanized on one side only and particularly to an improved method and apparatus for making such product continuously.

For certain industrial uses, sheet steel galvanized on one side but bare on the other is desirable. Green et al. Patent #2,894,850 discloses one method of making the product but that method has some disadvantages. It is accordingly the object of my invention to provide a simple, inexpensive and efiicient process which is readily adaptable to present galvanizing lines.

In a preferred embodiment and practice of my invention, I journal a coating roll horizontally above a spelter bath so that the lower portion of the roll is immersed in the bath. I pass steel strip over the roll and in contact with the top portion of its periphery. The roll turns in the spelter, picks up a film thereof and applies it to the lower surface of the strip. The surface of the spelter and the coating roll are preferably enclosed in a muffle and a shielding or gaging roll is journaled closely adjacent the coating roll, approximately at the level of the surface of the bath.

A complete understanding of the invention may be obtained from the following detailed description and explanation which refer to the accompanying drawings illustrating the present preferred embodiment. In the drawings, the single figure is a central vertical section through a galvanizing pot having mounted thereon the apparatus for carrying out my improved method.

Referring now in detatil to the drawing, a galvanizing pot is provided with any conventional heating means (not shown) and is filled with molten spelter up to a level 11, slightly below the upper edges of the pot walk. A coating roll 12 is journaled horizontally near the level 11, conveniently in bearings( not shown) secured to the pot walls. As shown, the lower portion only of the roll is immersed in the spelter. Deflector rolls 13 and 14 are similarly journaled, one on each side of and above roll 12 so as to guide strip S strained around them into contact with the upper portion of roll 12.

A shielding, pumping and gaging roll 15 is journaled similarly adjacent the top of the bath as shown and is preferably adjustable toward and from roll 12. Roll 15 prevents dross floating on the bath from approaching the ascending side of roll 12, aids the latter by a pumping action to pick up a spelter film, and may also serve to determine the thickness of the film picked up.

A muffle 16 encloses the space above the bath surface 12 and, at its entrance end 17, it communicates with a strip annealing furnace. The special atmosphere in the furnace therefore fills the mufile and continues to protect the strip S while passing therethrough. The exit end 18 of the mufile is provided with sealing rolls 19 between which the strip passes. Between roll 14 and rolls 19 are positioned smoothing rolls 20 adapted to engage the galvanized side of strip S while the coating is still molten, to spread it uniformly over the strip surface. Rolls 20 are journaled in bearings (not shown) suitably supported on the pot 10 or muflie 16.

Low-carbon steel strip S entering the inlet end of the muffle passes around deflector roll 13, over coating roll 3,228,788 Patented Jan. 11, 1966 12, then around deflector roll 14 and past smoothing rolls 20 before passing out of the muflie between sealing rolls 19. As already indicated, the roll 12 picks up a film of molten zinc from the surface of the bath and applies it to the lower surface of strip S. The coating thus applied is still soft enough to be spread and smoothed uniformly by rolls 20 as the strip comes in contact therewith but is solidified before the strip enters the sealing rolls. Artificial cooling may be applied in any convenient manner, if necessary, to achieve such solidification.

Roll 12 may be driven, if desired, at a peripheral speed equal to or greater than that of the strip. The strip is drawn through the annealing furnace and the galvanizing apparatus by conventional traction means not shown. Rolls 12 and 15 may have special surfaces, i.e., grooved or knurled, if needed, to aid them in picking up a film of spelter from bath 11. Roll 14 should have a length less than the width of strip S so it will not pick up spelter which may creep around the strip edges by capillary attraction.

After the strip emerges from the exit end 19 of the muffle 16 it may be cooled by contact with the atmosphere or otherwise and is then finished and sheared into sheets or coiled, in the known manner.

It will be recognized that my invention is characterized by important advantages. It is readily adaptable to existing continuous strip-galvanizing lines and requires but little change in present installations. It does not involve any change in established annealing practice or other precoating treatment. The cost of the operation is no more than that of coating on both sides and the material cost is reduced about half.

Although I have disclosed herein the preferred embodiment and practice of my invention, I intend to cover as Well any change or modification therein which may be made without departing from the spirit and scope of the invention.

I claim:

A method of galvanizing a sheet steel base on one side only comprising providing a bath of molten zinc having dross therein, causing a rotating horizontal roll to dip below the surface of the bath to pick up a zinc film therefrom over the full width thereof, providing a second rotating roll of substantially the same length as the first roll with a portion thereof below the surface of the bath, positioning the second roll with its axis substantially parallel to the axis of the first roll and its outer surface spaced a short distance from the outer surface of the first roll at the line of approximate tangency to gage the film on the second roll and prevent dross from approaching the ascending side of the first roll, and bringing a sheet-steel base over said first mentioned roll in contact with an arc of the circumference thereof, whereby said film is transferred to said base.

References Cited by the Examiner UNITED STATES PATENTS 1,928,160 9/1933 Watkins et al. 118-22 2,462,474 2/1949 Delano 118-118 2,483,652 10/1949 Lee 118-118 2,556,262 6/1951 Faeber 117-111 2,611,717 9/1952 Sooy et al 117-111 2,937,108 5/1960 Toye 117-51 2,968,091 1/1961 Schoenfeld 117-111 X 3,086,879 4/1963 La-ssifer 117-111 X RICHARD D. NEVIUS, Primary Examiner.

WILLIAM D. MARTIN, Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1928160 *Jun 2, 1932Sep 26, 1933Libbey Owens Ford Glass CoApparatus for sealing laminated glass
US2462474 *Mar 18, 1947Feb 22, 1949James K DelanoCoating apparatus for wires, filaments, and the like
US2483652 *Aug 7, 1946Oct 4, 1949Joseph O LeeMoistening machine for wallpaper
US2556262 *Nov 16, 1946Jun 12, 1951Time IncMethod of coating paper
US2611717 *Jan 22, 1949Sep 23, 1952Gardner Board & Carton CoMethod of calendering mineral coated paper
US2937108 *Oct 21, 1955May 17, 1960British Iron Steel ResearchMethod of tinning steel strip
US2968091 *Jan 29, 1954Jan 17, 1961American Can CoMethod of applying solder to a joint
US3086879 *Mar 5, 1958Apr 23, 1963Lassiter Frederic HMetallized products and foils and method of forming the same
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3928657 *Aug 31, 1973Dec 23, 1975British Steel CorpStrip shape correction on galvanising line
US4103644 *Sep 16, 1976Aug 1, 1978Michels Norman CApparatus for coating one side only of strip material
US4172911 *Apr 3, 1978Oct 30, 1979Michels Norman CMethod of coating one side only of strip material
US4239817 *Apr 27, 1979Dec 16, 1980Thyssen Aktiengesellschaft Vorm. August Thyssen-HutteProcess and apparatus for coating one side of a metal strip with molten metal
US4246865 *Feb 9, 1978Jan 27, 1981Asahi Glass Company LimitedOne side surface molten metallic coating apparatus
US4250207 *May 29, 1979Feb 10, 1981Nippon Steel CorporationMethod for applying coating of molten metals
US4365583 *Aug 25, 1980Dec 28, 1982Nippon Steel CorporationApparatus for applying coating of molten metals
DE3047979A1 *Dec 19, 1980Jul 15, 1982Sack Bandanlagentechnik GmbhVorrichtung zum einseitigen beschichten eines metallbandes
DE3124990A1 *Jun 25, 1981Apr 15, 1982Sundstrand Data ControlVerfahren und vorrichtung zum aufzeichnen von digitaldaten
EP0036098A1 *Feb 20, 1981Sep 23, 1981MANNESMANN AktiengesellschaftProcess and apparatus for the single-faced coating of a continuous strip
EP0056485A1 *Dec 23, 1981Jul 28, 1982MANNESMANN AktiengesellschaftMethod and apparatus for coating one side of a moving strip
Classifications
U.S. Classification427/428.16, 427/360, 118/246, 118/118, 427/428.2
International ClassificationC23C2/00
Cooperative ClassificationC23C2/006
European ClassificationC23C2/00D