WO2020069733A1 - Méthode de traitement d'acier galvanisé ou recuit par galvanisation - Google Patents

Méthode de traitement d'acier galvanisé ou recuit par galvanisation

Info

Publication number
WO2020069733A1
WO2020069733A1 PCT/EP2018/076873 EP2018076873W WO2020069733A1 WO 2020069733 A1 WO2020069733 A1 WO 2020069733A1 EP 2018076873 W EP2018076873 W EP 2018076873W WO 2020069733 A1 WO2020069733 A1 WO 2020069733A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
providing
applicator roll
coating liquid
coating
Prior art date
Application number
PCT/EP2018/076873
Other languages
English (en)
Inventor
Hendrik Bart Van Veldhuizen
Arno Harold René HARMSEN
Marcellinus Theodorus DE WINTER
Original Assignee
Tata Steel Ijmuiden B.V.
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 Tata Steel Ijmuiden B.V. filed Critical Tata Steel Ijmuiden B.V.
Priority to EP18782419.8A priority Critical patent/EP3860769A1/fr
Priority to PCT/EP2018/076873 priority patent/WO2020069733A1/fr
Publication of WO2020069733A1 publication Critical patent/WO2020069733A1/fr

Links

Classifications

    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0808—Details thereof, e.g. surface characteristics
    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/0834—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets the coating roller co-operating with other rollers, e.g. dosing, transfer rollers
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • 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
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe
    • 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
    • B05D2252/00—Sheets
    • B05D2252/10—Applying the material on both sides
    • 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
    • B05D2350/00—Pretreatment of the substrate
    • 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
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • B05D2350/65—Adding a layer before coating metal layer

Definitions

  • the invention relates to a method of treating a substrate, comprising:
  • a contact angle Q is defined as the angle, measured -in a static situation- through the coating liquid, where the liquid-vapour interface of the coating liquid meets the solid surface of the applicator roll;
  • ribbing defects are often observed in conventional roll coating processes for liquid coatings, for example, when the coating liquid has a viscosity of about 0.1 mPa.s or greater.
  • the defects may occur as a coating liquid passes through a nip between rolls and the viscous stress at a film split overcomes surface tension forces attempting to maintain a uniform curvature of the interface at the film split.
  • the ribbing defect may according to this document lead to a highly non-uniform coating as the liquid exits the nip. To address this problem it may be necessary to limit line speeds. Other problems are that it may reduce the coating efficiency, and increase the cost of production. Additionally according to this document, as line speeds are increased it can lead to misting, for example, ejection of small droplets in the form of a mist, which can be a concern for the health and safety of the factory environment.
  • the ribbing defect is cured by arranging that the first roll comprises a thin metal shell and a resilient layer, the thin metal shell encases the resilient layer there beneath, and the thin metal shell is capable of deflecting in unison with the resilient layer such that the thin metal shell is elastically deformable at the nip when in contact with the second roll.
  • a method comprising the steps of: - providing that the substrate (5) is a metal strip (5’);
  • Forward coating mode means that the tangential speed of the surface area of the applicator roll and the line speed of the substrate are in the same direction.
  • Reverse coating mode means that the tangential speed of the surface area of the applicator roll and the line speed are in opposite directions.
  • the words“substantially matches” as used in this claim mean that preventing the ribbing defect can be promoted by arranging that the absolute value of the said tangential speed of the surface area of the rolls contacting the substrate differs less than 50 % from the absolute value of the line speed.
  • the inventors have found that controlling the contact angle Q to 97° or below plays a decisive role in the reduction and prevention of the ribbing defect when treating a metal strip.
  • the method comprises:
  • the contact angle Q is 93° or smaller and more preferably:
  • the mentioned 97° is an upper limit; more favourable results are achievable by providing that the contact angle Q is smaller than 93°, more preferably even smaller than 80°. Where the ribbing result at contact angles Q from 93° to 97° varies from good to excellent, it is very good to excellent at 80° or smaller.
  • At least one applicator roll (2, 3) has a polymer cover, wherein the tangential speed of the surface area of the applicator roll (2, 3) differs 30 % or less, preferably 20 % or less, and most preferably 10 % or less up or down with respect to the line speed of the substrate (5).
  • the treatment of the galvanised or galvannealed steel is carried out preferably by arranging that at least one of the applicator rolls has a polymer cover and where the method is used in forward coating mode, that the coating liquid (10) is applied to the substrate (5) as a thin wet film having a thickness of 4 pm or less, preferably 3 pm or less, and where the method is used in reverse coating mode, that the coating liquid (10) is applied to the substrate (5) as a thin wet film of less than 8 pm, preferably less than 6 pm, more preferably less than 4 pm.
  • the invention has been found to work well if the metal substrate is already coated, preferably zinc based coated, e.g. is a galvanised or galvannealed steel substrate or a substrate with a zinc coating alloyed with aluminium and magnesium such as Magizinc®.
  • zinc based coated e.g. is a galvanised or galvannealed steel substrate or a substrate with a zinc coating alloyed with aluminium and magnesium such as Magizinc®.
  • the result of the method of the invention is e.g. a galvanised or galvannealed steel treated with the coating liquid, wherein ribbing defects are effectively avoided.
  • Figure 1 shows an apparatus employing the method according to the invention.
  • Figure 2 shows a diagram explaining the principles determining the contact angle Q.
  • Figure 3 shows contact angles measured using coating liquids designated as 10% and 20% in combination with materials of the surface of the applicator roll designated as rubbers A - N.
  • Figure 1 shows an apparatus 1 comprising a first applicator roll 2, a second applicator roll 3, and a nip 4 between the first and second applicator rolls 2, 3.
  • a substrate 5 in the form of a galvanised or galvannealed steel strip 5’ moves with a predefined speed in the direction of arrow b.
  • the steel strip 5’ is coated on both sides with a coating liquid 10 (normally but not necessarily the same on each side) that is stored in and retrieved from tanks 6, 7.
  • Supporting or pick-up rolls 8, 9 are rotating within the tanks 6, 7 to pick up the coating liquid 10 from these tanks 6, 7.
  • Figure 1 shows that the applicator roll 2 is counter-rotating with a tangential speed as symbolized with arrow c, and which is opposite (reverse coating mode) to the movement direction of the metal strip 5’ symbolized by the arrow b.
  • reverse coating mode the strip will carry almost all (more than 95%) of the coating to the strip.
  • the roll 2 has a tangential speed which is in the same direction as the movement direction b of the metal strip 5 (forward coating mode).
  • Arrow c is then pointing in a direction opposite to the one shown in figure 1.
  • the strip will only carry about 50% of the coating to the strip, the remainder of the coating staying on the applicator roll 2, 3.
  • the contact angle Q is symbolized in figure 2 with the letter O’.
  • the contact angle Q is defined as the angle where -in equilibrium- the liquid-ambient-atmosphere- interface meets the solid surface of the applicator roll (2, 3), see figure 2.
  • the horizontal line represents the solid surface of the applicator roll (2,3) and the curved line represents the abovementioned interface.
  • Practical values for the tangential speed of the surface area of the rolls 2, 3 and the line speed of the substrate 5 are that each speed is set in the range of 50 to 140 m/min.
  • the contact angle Q is 97° or smaller, and more preferably that the contact angle Q is 93° and even more preferably that is is 80° or smaller.
  • the invention is also embodied in a galvanised or galvannealed steel strip 5 treated with a coating liquid 10 as provided on the metal strip 5 in accordance with the method of the invention.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Un procédé consiste à : - fournir un premier rouleau, un second rouleau et un espacement entre les premier et second rouleaux ; - faire passer un substrat à travers l'espacement entre les rouleaux à une vitesse de ligne prédéterminée ; - fournir un liquide de revêtement au substrat dans l'espacement, le liquide de revêtement ayant un angle de contact θ prédéterminé avec le substrat ; et - lisser le liquide de revêtement, par l'intermédiaire de l'espacement, en une couche sensiblement uniforme de revêtement liquide sur le substrat, - à condition que le substrat soit une bande d'acier galvanisé ou recuit après galvanisation ; - à condition qu'une vitesse circonférentielle d'une surface des rouleaux entrant en contact avec le substrat corresponde sensiblement à la vitesse de ligne ; et - à condition que l'angle de contact θ du liquide de revêtement avec le substrat soit inférieur à 97.
PCT/EP2018/076873 2018-10-02 2018-10-02 Méthode de traitement d'acier galvanisé ou recuit par galvanisation WO2020069733A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18782419.8A EP3860769A1 (fr) 2018-10-02 2018-10-02 Méthode de traitement d'acier galvanisé ou recuit par galvanisation
PCT/EP2018/076873 WO2020069733A1 (fr) 2018-10-02 2018-10-02 Méthode de traitement d'acier galvanisé ou recuit par galvanisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/076873 WO2020069733A1 (fr) 2018-10-02 2018-10-02 Méthode de traitement d'acier galvanisé ou recuit par galvanisation

Publications (1)

Publication Number Publication Date
WO2020069733A1 true WO2020069733A1 (fr) 2020-04-09

Family

ID=63762531

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/076873 WO2020069733A1 (fr) 2018-10-02 2018-10-02 Méthode de traitement d'acier galvanisé ou recuit par galvanisation

Country Status (2)

Country Link
EP (1) EP3860769A1 (fr)
WO (1) WO2020069733A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4263870A (en) * 1976-08-12 1981-04-28 Fuji Photo Film Co., Ltd. Coating process
US20090324842A1 (en) * 2005-04-12 2009-12-31 Toray Industries, Inc. Coater of electric insulating sheet and method for producing electric insulating sheet with coated film
WO2016200866A1 (fr) 2015-06-12 2016-12-15 3M Innovative Properties Company Procédé et appareil de revêtement liquide comprenant un rouleau métallique déformable
US20170120260A1 (en) * 2015-10-30 2017-05-04 The Procter & Gamble Company Equipment and processes for the non-contact printing of actives onto web materials and articles
US10022743B2 (en) * 2014-09-18 2018-07-17 Panasonic Intellectual Property Management Co., Ltd. Coating film production method, coating film production apparatus, coating film, nonaqueous secondary battery electrode plate, and mobile body

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4263870A (en) * 1976-08-12 1981-04-28 Fuji Photo Film Co., Ltd. Coating process
US20090324842A1 (en) * 2005-04-12 2009-12-31 Toray Industries, Inc. Coater of electric insulating sheet and method for producing electric insulating sheet with coated film
US10022743B2 (en) * 2014-09-18 2018-07-17 Panasonic Intellectual Property Management Co., Ltd. Coating film production method, coating film production apparatus, coating film, nonaqueous secondary battery electrode plate, and mobile body
WO2016200866A1 (fr) 2015-06-12 2016-12-15 3M Innovative Properties Company Procédé et appareil de revêtement liquide comprenant un rouleau métallique déformable
US20170120260A1 (en) * 2015-10-30 2017-05-04 The Procter & Gamble Company Equipment and processes for the non-contact printing of actives onto web materials and articles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
J. GREENER; GORDON; BREACH ET AL.: "Chem. Eng. Common", vol. 5, 1980, SCIENCE PUBLISHERS INC., article "Ribbing Instability of a Two-roll Coater: Newtonian fluids", pages: 73 - 83

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