US3728147A - Method for combined coating and cold reduction of metal - Google Patents

Method for combined coating and cold reduction of metal Download PDF

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Publication number
US3728147A
US3728147A US00073350A US3728147DA US3728147A US 3728147 A US3728147 A US 3728147A US 00073350 A US00073350 A US 00073350A US 3728147D A US3728147D A US 3728147DA US 3728147 A US3728147 A US 3728147A
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United States
Prior art keywords
coating
strip
fluid
rolls
cold
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Expired - Lifetime
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US00073350A
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English (en)
Inventor
W Jenkins
T Williams
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British Iron and Steel Research Association BISRA
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British Iron and Steel Research Association BISRA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/068—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using ionising radiations (gamma, X, electrons)

Definitions

  • This invention relates to the production of metal sheet or strip having a protective coating and is particularly concerned with the production of coated steel sheet or strip.
  • hot band material i.e. material produced by hot rolling is subsequently cold reduced in mill stands which exert considerable pressure upon the sheet being Worked.
  • the cold reduced material is subject to heat treatment eflective to modify the characteristics of the final product.
  • the cold reduced material may for example be decarburised, it may be heat treated to relieve stress introduced during cold rolling or it may be heat treated to improve further the surface finish.
  • Such heat treatment generally occurs at temperatures up to 700 C. and in this temperature range the residual oils is in general removed by evaporation.
  • the present invention is based on the discovery that by suitable selection of fluid eflective to provide lubrication of cold mill rolls, the need to remove the residual fluid film by cleaning can be dispensed with.
  • a process for producing cold rolled metal sheet or strip having a protective coating including subjecting to radiation of an accelerated electron beam X-rays or gamma rays, sheet or strip which has been coated through contact with the rolls, with a layer fluid capable of cross linking or polymerisation under the influence of the radiation and effective to provide a degree of roll lubrication.
  • a suitable fluid may be selected from those commonly used to provide lubrication of cold mill rolls and known in the art as rolling oils or from any other fluid capable of cross linking or polymerisation under the influence of radiation.
  • suitable fluids other than rolling oils are polymers such as polyethylene, liquid paralfin, natural oils and dioctyl sebacate.
  • the fluid may be applied to the mill rolls by any means well known in the art, for example, by spraying through suitably spaced apart nozzles adapted to provide overlapping spray areas at the rolls to ensure complete cover age.
  • a further coating of a material capable of cross linking or polymerisation is applied to the fluid coating acquired by the sheet or strip during cold rolling, and the composite coating is subjected to irradiation in vacuum by an accelerated electron beam, X-rays or gamma rays to cross link or polymerise both coatings and provide an improved protective layer.
  • the initial coating may initially be partially or fully cured by exposure under vacuum to radiation of an accelerated electron beam, X-rays or gamma rays.
  • the further coating of material is produced by vacuum deposition; however, the further layer may be produced by other techniques well known in the art, prior to curing by radiation.
  • steel strip produced by hot rolling and subsequently cold reduction is shown emerging at substantially final gauge 2 from the nip of end rolls 4.
  • a fluid capable of cross linking or polymerisation under the action of radiation of an accelerated electron beam, X-rays or gamma rays, and of providing a degree of lubrication of the rolls.
  • the fluid is applied to the rolls 4 by way of nozzles (not shown) which provide overlapping areas of spray at incidence upon the rolls to ensure complete coverage.
  • any form of applying fluid to the rolls well known in the art may be used.
  • Strip 2 which acquires a coating of fluid by contact with the rolls 4, passed through an oven 6 effective to spread or/ and to fully or partially dry the coating.
  • the continuous strip passes through a vacuum chamber 8, the entrance and exit of which are closed by vacuum seals 10 and 12 respectively, each seal comprising a plurality of roller seals 14 each positioned in a vacuum chamber.
  • the vacuum chamber 8 is provided with a plurality of electron guns 16 for irradiating the coated strip passing through the chamber.
  • the coated strip leaves the vacuum chamber 8 through the seal 12.
  • Palm oil was applied to the rolls 4 to leave a residual coating upon the strip 2 which was spread to uniformity by passage through the oven 6.
  • the dried residual coating was then cured by an electron beam from the guns 16 at an accelerated voltage of 10 kv. although voltages up to 15 kv. may be used.
  • the beam current was adjusted to raise the temperature of the strip to about 200 C. to produce complete curing, which was established when the coating became completely insoluble in methyl ethyl ketone.
  • EXAMPLE 2 The strip with the cured coating provided by Example 1 was vacuum coated with an epoxy resin having an average molecular weight between 900 and 1400 giving a final coating thickness of about 3 microns.
  • the composite coating was passed into a vacuum chamber substantially identical to chamber 8 and cured by an electron beam accelerated at 10 kv. and a current again effective to raise strip temperature to 200 C.
  • the composite coated strip was shown to have properties similar to an epoxy coating as currently used in the art to lacquer tin plate.
  • the epoxy resin may be applied to the layer of palm oil or other rolling oil or fluid which has been only partly cured by passage through the irradiating chamber 8, for example by reducing the beam current from the electron guns 16.
  • the partial curing of the initial coating may be entirely dispensed with and the epoxy resin may be deposited, either under vacuum or at substantially atmospheric pressure, directly onto the initial coating.
  • the composite coating again is then cured by irradiation in the manner described.
  • any fiuid capable of cross linking or polymerisation under radiation may be used.
  • examples of such fluids are low molecular weight materials such as polyethylene which display suflicient lubricating quantities and provide an acceptable coating, as well as liquid paraffin, natural oils and dioctyl sebacate.
  • coated strip emerging from the cold mill rolls FIG. 4 may be coiled for storage and subsequently uncoiled for the curing operation.
  • a process for producing cold rolled metal sheet material having a protective coating which comprises the steps of coating said sheet as it passes between the rolls of a reducing mill with a layer of fluid which provides roll lubrication while fluid and which is capable of cross-linking or polymerization under the influence of radiation selected from the group consisting of an accelerated electron beam, X-rays and gamma rays, and subjecting said sheet to such radiation after it has passed through said rolls.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US00073350A 1969-09-23 1970-09-18 Method for combined coating and cold reduction of metal Expired - Lifetime US3728147A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB46796/69A GB1272133A (en) 1969-09-23 1969-09-23 Coating metal

Publications (1)

Publication Number Publication Date
US3728147A true US3728147A (en) 1973-04-17

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US00073350A Expired - Lifetime US3728147A (en) 1969-09-23 1970-09-18 Method for combined coating and cold reduction of metal

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US (1) US3728147A (de)
DE (1) DE2046653C3 (de)
FR (1) FR2062525A5 (de)
GB (1) GB1272133A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4091123A (en) * 1976-06-14 1978-05-23 Nippon Steel Corporation Method for the manufacture of a steel sheet having excellent lubricating property
US4179529A (en) * 1977-03-24 1979-12-18 Rohm Gmbh Method of lubricating a thermoplastic resin strand for sliding contact in a reshaping device
US4445813A (en) * 1977-11-16 1984-05-01 National Can Corporation Method of forming seamless container
EP1908528A2 (de) * 2006-09-02 2008-04-09 Laurell Bengt Zentraltrockner für die Elektronenstrahlhärtung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1549711A (en) * 1975-04-22 1979-08-08 Ball Corp Apparatus for applying lubricating materials to substrates
DE3010821A1 (de) * 1980-03-21 1981-10-01 Polymer-Physik GmbH & Co KG, 2844 Lemförde Verfahren und vorrichtung zur vernetzung von auf traegermaterialien aufgebrachten lacken auf kunststoffbasis

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4091123A (en) * 1976-06-14 1978-05-23 Nippon Steel Corporation Method for the manufacture of a steel sheet having excellent lubricating property
US4179529A (en) * 1977-03-24 1979-12-18 Rohm Gmbh Method of lubricating a thermoplastic resin strand for sliding contact in a reshaping device
US4445813A (en) * 1977-11-16 1984-05-01 National Can Corporation Method of forming seamless container
EP1908528A2 (de) * 2006-09-02 2008-04-09 Laurell Bengt Zentraltrockner für die Elektronenstrahlhärtung
US20080087845A1 (en) * 2006-09-02 2008-04-17 Dirk Burth Central dryer for electron beam curing
EP1908528A3 (de) * 2006-09-02 2008-05-14 Laurell Bengt Zentraltrockner für die Elektronenstrahlhärtung
US7737423B2 (en) 2006-09-02 2010-06-15 Dirk Burth Central dryer for electron beam curing

Also Published As

Publication number Publication date
GB1272133A (en) 1972-04-26
DE2046653C3 (de) 1979-02-15
FR2062525A5 (de) 1971-06-25
DE2046653A1 (de) 1971-04-08
DE2046653B2 (de) 1978-06-29

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