EP4282541A1 - Verfahren und anlage zum aufbringen einer flüssigen beschichtung auf ein kontinuierlich durchlaufendes und abwärtsgerichtetes band - Google Patents

Verfahren und anlage zum aufbringen einer flüssigen beschichtung auf ein kontinuierlich durchlaufendes und abwärtsgerichtetes band Download PDF

Info

Publication number
EP4282541A1
EP4282541A1 EP22174939.3A EP22174939A EP4282541A1 EP 4282541 A1 EP4282541 A1 EP 4282541A1 EP 22174939 A EP22174939 A EP 22174939A EP 4282541 A1 EP4282541 A1 EP 4282541A1
Authority
EP
European Patent Office
Prior art keywords
unit
coating
cooking
liquid
aerodynamic
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.)
Pending
Application number
EP22174939.3A
Other languages
English (en)
French (fr)
Inventor
Eric GOREUX
Enrico TIRELLI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
John Cockerill SA
Original Assignee
John Cockerill SA
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 John Cockerill SA filed Critical John Cockerill SA
Priority to EP22174939.3A priority Critical patent/EP4282541A1/de
Priority to PCT/EP2023/055213 priority patent/WO2023227264A1/fr
Publication of EP4282541A1 publication Critical patent/EP4282541A1/de
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • B05D3/02—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 baking
    • B05D3/0254—After-treatment
    • 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
    • B05D3/04—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 gases
    • B05D3/0486—Operating the coating or treatment in a controlled atmosphere
    • 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
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • 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
    • 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
    • B05D2252/02—Sheets of indefinite length
    • 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
    • B05D3/10—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 other chemical means
    • B05D3/102—Pretreatment of metallic substrates

Definitions

  • the present invention relates to the field of liquid coating of substrates such as strips, in particular the coating of continuously running metal strips with a paint, varnish, thin organic coating or any other surface treatment.
  • the invention relates to the field of coating electrical steel sheets with an insulating varnish (or lacquer) which subsequently allows, thanks to its adhesiveness, to glue the sheets by stacking for the production of cores. electrical.
  • FIG. 1 shows an example of production according to the state of the art.
  • an oven 3 such as an induction or infrared oven
  • the volatile organic compounds are treated in an ad hoc unit 5.
  • the coated strip 12 changes direction at the level of an upper return roller 2 (top roll) and is then subjected to water cooling in a water cooling unit 6 and to hot air drying in a dryer 7, before being directed to an output accumulator 8.
  • insulating varnish In electrical engineering, we use assemblies of laminated soft iron sheets to create the magnetic circuits of the coils (electromagnets, transformers, rotating machines, etc.). These sheets are coated with an insulating varnish to limit the circulation of parasitic currents (eddy currents) and therefore the heating of the magnetic circuit and the iron losses, which are proportional to the square of the frequency.
  • the preparation of insulating varnish may include, in an aqueous or organic phase, a thermosetting resin, for example epoxy, polyester, acrylic, phenolic, silicone, etc.
  • the coated sheets are compressed and heated.
  • the baking of insulating varnish is carried out in two stages: a first time in this line and a second time at the engine manufacturer. This means that the cooking of the varnish is not complete when it touches the upper deflector roller of the present line, resulting in an unwanted phenomenon of sticking or adhesion. The latter could also occur with other types of coatings and for different reasons.
  • cooking is complete when the strip reaches the upper roller and there is no adhesion problem.
  • solvent is used in the text by abuse of language, but in reality it can also be smoke, gas or residual vapors which escape from the sheet after cooking and which come for example from hardeners and are then in the form of blue and pungent smoke.
  • the document FR 2 640 890 A1 discloses an installation for applying and drying a liquid coating on a continuous strip of sheet metal, such as a continuous lacquering installation.
  • the sheet passes successively through a preparatory treatment station then at least one coating and drying station in which the sheet moves vertically downwards.
  • This last station comprises, in the order of passage of the strip, a coating device on the sheet metal strip, then induction or infrared heating means which evaporate the solvent and polymerize the binder, and the strip then passes through a cooling device preferably comprising a tank which is filled with refrigerant liquid and in which is placed a guide or return roller which changes the direction of the sheet metal strip.
  • Explosions in solvent evaporation systems are rare but require ad hoc devices to channel the shock wave.
  • the damage can be significant, particularly in hot air ovens which constitute a significant explosive volume compared to induction ovens which are significantly shorter and have a particularly reduced cross section (approximately 2000 mm x 200 mm) compared to a cross section of several m 2 for hot air ovens (approximately 2500 mm x 2500 mm).
  • the coating chambers are generally maintained at a slightly positive pressure relative to the environment to limit the entry of dust likely to contaminate the paint.
  • the ovens are also maintained at a pressure significantly lower than that of the chambers in order to avoid the entry of toxic solvents into the room where the operators are located.
  • the solvent extraction fan is therefore a major element in the general safety system of the installation.
  • the path of the solvent-laden air in the hot air ovens is transverse to the belt with suction flow rates adapted to the quantity of solvent generated per oven zone.
  • a downward pass coating as in FR 2 640 890 A1 would take place in counter-current mode between hot air and belt. It must include a thermal system under the coating and end with water cooling which has the advantage of not requiring an intermediate return roller, which deteriorates a coating that is not completely dried while becoming clogged.
  • This principle nevertheless currently poses a huge problem of pollution of the coating chamber following an exhaust of air heavily loaded with solvents despite the depression of the ovens in relation to this chamber which tends to fight against the gravitational forces acting on hot air.
  • the present invention aims to provide a method and an installation for coating a continuously moving strip using a liquid, without risking damage to the coating by contact with a return roller before the strip has completely cooled.
  • a solution provided by the invention is represented according to the mode of execution of the Figure 3 .
  • the general idea is to produce a continuous movement of the strip in descending strand, but bypassing the implementation difficulties found by implementing the basic technology according to the document FR 2 640 890 A1 .
  • a water cooling unit 6 in a closed loop circuit is installed after the outlet of the cooking unit 3 comprising one or more ovens, near the lowest point of the installation.
  • the coating being already cooled by the water and in addition, the lower return roller 1 being in the water, the quality of the coating is not affected in this configuration at the moment when the strip passes over the return roller because the temperature at this location is close to room temperature.
  • the specificity of the present invention is to be able to operate a continuous coating line of a metal strip in a downward pass while guaranteeing the integrity of a coating that is not completely dry, which is necessary in certain applications while avoiding risks. explosion and/or fire linked to the solvent as described above.
  • the big advantage of coating in a downward pass unlike the situation in an upward pass, is to be able to completely cool the sheet (i.e. up to ambient temperature) before the first physical/mechanical contact which is that of a return roller and without using vigorous air blowing which condenses the solvents on the cooling device and causes significant vibration of the belt as well as condensation of the hardener fumes on the blowing systems but using water in the form of either sprinkling or immersion.
  • Aeroven TM an aeraulic/aerodynamic airlock
  • this system integrates an oriented return for example with deflectors of 30° relative to the horizontal and a recirculation followed by a homogeneous blowing also oriented.
  • the high-speed circulation loop requires a fan with a capacity greater than 10000Pa.
  • the system includes an evacuation or make-up flow controlled independently of the blowing speed for local depression or overpressure and a physical barrier adjustable according to operating conditions.
  • the airlocks are located just below or above the fresh air supply or solvent-laden air return loops, nevertheless with sufficient access for possible maintenance interventions.
  • the whole ensures both the maintenance of a sanitary tolerable atmosphere in the coating chamber (thanks to an upper airlock) and reasonable cleanliness of the water spraying system (thanks to an airlock lower) by limiting contamination towards the two enclosures located respectively at the top and bottom of the ovens.
  • the downward pass installation according to the invention can be controlled either by at least one operator located on the upper floor (at the level of the applicators) and at least one operator located on the ground floor (on the oven level), or centralized at the level of a single operator.
  • an aeraulic/aerodynamic airlock 21, 22 must be provided respectively at the top (entrance) and bottom (exit) of zone 3 of the ovens.
  • the entrance airlock 21 of the ovens is made up, on each side of the belt, successively of boxes 25, 24 respectively for suction and reinjection of air (with recirculation).
  • the suction boxes 25 suck in both the cold air which enters from the coating unit 4 and the hot air rising from the ovens 3 while the boxes 24 reinject the sucked air.
  • This system will create an aerodynamic plug which will prevent the hot air from the ovens 3 containing solvents from contaminating the coating zone 4.
  • the hot air loaded with solvents will then ultimately be sucked up at the top of the ovens towards the unit for treating volatile organic compounds (VOC) 5.
  • the boxes 24 and/or 25 include nozzles whose orientation is appropriate for producing the aerodynamic plug.
  • the coating zone 4 is maintained at slight excess pressure relative to the environment, while the oven zone 3 is maintained at depression.
  • the exit airlock 22 of the ovens 3 is also composed, on each side of the belt, successively of boxes 25, 24 respectively for suction and injection of hot air (with recirculation).
  • Hot air at high flow rate e.g. at 250°C
  • Hot air at high flow rate is injected at the bottom of the oven zone 26. Part of this hot air is therefore sucked in and reinjected through the airlock, part of which is still redirected towards the VOC treatment unit 5.
  • Most of the hot air injected will circulate against the current of the belt before its evacuation towards the VOC treatment unit 5.
  • the water cooling box (in occurrence by sprinkling) 6 is maintained in depression relative to the environment.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP22174939.3A 2022-05-23 2022-05-23 Verfahren und anlage zum aufbringen einer flüssigen beschichtung auf ein kontinuierlich durchlaufendes und abwärtsgerichtetes band Pending EP4282541A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22174939.3A EP4282541A1 (de) 2022-05-23 2022-05-23 Verfahren und anlage zum aufbringen einer flüssigen beschichtung auf ein kontinuierlich durchlaufendes und abwärtsgerichtetes band
PCT/EP2023/055213 WO2023227264A1 (fr) 2022-05-23 2023-03-01 Procede et installation pour l'application d'un revetement liquide sur une bande en defilement continu et en passe descendante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22174939.3A EP4282541A1 (de) 2022-05-23 2022-05-23 Verfahren und anlage zum aufbringen einer flüssigen beschichtung auf ein kontinuierlich durchlaufendes und abwärtsgerichtetes band

Publications (1)

Publication Number Publication Date
EP4282541A1 true EP4282541A1 (de) 2023-11-29

Family

ID=81842000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22174939.3A Pending EP4282541A1 (de) 2022-05-23 2022-05-23 Verfahren und anlage zum aufbringen einer flüssigen beschichtung auf ein kontinuierlich durchlaufendes und abwärtsgerichtetes band

Country Status (2)

Country Link
EP (1) EP4282541A1 (de)
WO (1) WO2023227264A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR961275A (de) * 1950-05-09
GB785572A (en) * 1955-03-23 1957-10-30 Wheeling Steel Corp A method and apparatus for continuously applying a protective coating to metal coated strip
FR2640890A1 (en) 1988-12-23 1990-06-29 Galvanisation Produits Usines Installation for laying down and for fixing a covering onto a continuous sheet-metal strip
FR2768157A1 (fr) 1997-09-09 1999-03-12 Lorraine Laminage Tole d'acier galvanise allie, procedes et installation pour la fabrication d'une telle tole
FR2958563A3 (fr) * 2010-04-13 2011-10-14 Fives Stein Procede et dispositif de revetement de bandes metalliques.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR961275A (de) * 1950-05-09
GB785572A (en) * 1955-03-23 1957-10-30 Wheeling Steel Corp A method and apparatus for continuously applying a protective coating to metal coated strip
FR2640890A1 (en) 1988-12-23 1990-06-29 Galvanisation Produits Usines Installation for laying down and for fixing a covering onto a continuous sheet-metal strip
FR2768157A1 (fr) 1997-09-09 1999-03-12 Lorraine Laminage Tole d'acier galvanise allie, procedes et installation pour la fabrication d'une telle tole
FR2958563A3 (fr) * 2010-04-13 2011-10-14 Fives Stein Procede et dispositif de revetement de bandes metalliques.

Also Published As

Publication number Publication date
WO2023227264A1 (fr) 2023-11-30

Similar Documents

Publication Publication Date Title
US5325601A (en) Method for drying and curing a coated metal substrate
KR20120049266A (ko) 제작품에 금속 입자를 포함하는 적어도 하나의 항 부식 액체 도포제를 적용하는 방법 및 이들을 위한 장치
OA11408A (fr) Procédé de séchage des bois de sciage et dispositif permettant la mise en oeuvre du procédé.
EP4282541A1 (de) Verfahren und anlage zum aufbringen einer flüssigen beschichtung auf ein kontinuierlich durchlaufendes und abwärtsgerichtetes band
CA2826149A1 (fr) Traitement thermique de revetement par laser
WO1992019925A1 (en) Method and device for drying polymer coating deposited from solution on the surface of article
EP2558804B1 (de) Verfahren und vorrichtung zur beschichtung von metallstreifen
US9134257B2 (en) Method and apparatus for identifying defects in susceptors of microwave food containers
EP2872306A1 (de) Verfahren zur herstellung eines trennzauns und trennzaun
WO2009136010A1 (fr) Procédé de séchage et/ou de cuisson d'un revêtement: organique sur une bande métallique en défilement continu, et dispositif pour la mise en oeuvre de ce procédé
FR2545818A1 (fr) Procede et dispositif de formation d'un revetement de compose metallique sur un substrat chaud en matiere vitreuse
JP2022176947A (ja) 揮発性有機化合物の回収装置及び回収方法
FR2523876A1 (fr) Appareil et procede pour appliquer un revetement sur un substrat avec durcissement sous vide et recuperation du solvant
WO2016062768A2 (en) Method of coating substrate
EP3102340B1 (de) Verfahren zum trocknen oder härten einer organischen beschichtung auf einer glasplatte
EP0421902A1 (de) Vakuumtrocknungsverfahren für Stückgüter und Vorrichtung zur Durchführung des Verfahrens
EP1644680B1 (de) Verfahren und vorrichtung zum trocknen eines nichtmetallischen überzugs auf einem stahlband
WO2005120743A1 (fr) Procede de fabrication de capsules decorees a resistance mecanique amelioree
US9108219B2 (en) Method for depositing a layer on the surface of a substrate
US2848819A (en) Method of drying a wet coating on the interior of a container body
CN204022935U (zh) 一种真空镀膜设备
CN205452250U (zh) 柔性基板的固化装置
WO1991012083A1 (fr) Dispositif pour rendre homogene, regulier, et controlable le depot electrostatique de liquides ou de poudres sur des susbtrats non mis a la masse d'un generateur de haute-tension
EP0566958A1 (de) Verfahren zum Reparieren von defekten Beschichtungen auf einem metallischen Substrat
BE1011090A3 (fr) Procede de revetement d'une bande en deplacement continu et bande ainsi revetue.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20240516

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR