EP0195099B1 - Bandbeschichtungsverfahren von Schwarzblech oder Substrat auf Schwarzblechbasis zu gebrauchen bei der Herstellung von Dosen oder Dosenteilen - Google Patents

Bandbeschichtungsverfahren von Schwarzblech oder Substrat auf Schwarzblechbasis zu gebrauchen bei der Herstellung von Dosen oder Dosenteilen Download PDF

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Publication number
EP0195099B1
EP0195099B1 EP85103211A EP85103211A EP0195099B1 EP 0195099 B1 EP0195099 B1 EP 0195099B1 EP 85103211 A EP85103211 A EP 85103211A EP 85103211 A EP85103211 A EP 85103211A EP 0195099 B1 EP0195099 B1 EP 0195099B1
Authority
EP
European Patent Office
Prior art keywords
strip
coating
screen printing
blackplate
coating material
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
Application number
EP85103211A
Other languages
English (en)
French (fr)
Other versions
EP0195099A1 (de
Inventor
Huig Bunk
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.)
Tata Steel Ijmuiden BV
Original Assignee
Hoogovens Groep BV
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 Hoogovens Groep BV filed Critical Hoogovens Groep BV
Priority to DE8585103211T priority Critical patent/DE3562991D1/de
Priority to EP85103211A priority patent/EP0195099B1/de
Publication of EP0195099A1 publication Critical patent/EP0195099A1/de
Application granted granted Critical
Publication of EP0195099B1 publication Critical patent/EP0195099B1/de
Expired legal-status Critical Current

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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
    • B05D7/16—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 using synthetic lacquers or varnishes
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
    • 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
    • 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
    • B05D2701/00—Coatings being able to withstand changes in the shape of the substrate or to withstand welding
    • B05D2701/10—Coatings being able to withstand changes in the shape of the substrate or to withstand welding withstanding draw and redraw process, punching

Definitions

  • the invention relates to a method of coil coating a layer of organic coating material onto a strip of blackplate or a substrate based on blackplate intended for use in the manufacture of cans and/or can parts, e.g. drawn and wall-ironed cans or deep drawn cans.
  • Blackplate in this connection means cold rolled, annealed and temper rolled packing steel, usually in the range 0.1 to 0.5 mm thick.
  • Proposals have already been made for manufacturing cans from blackplate coated with a thermosetting resin.
  • US-A-4032678 proposes manufacturing a drawn and wall-ironed can from blackplate coated with a thermosetting resin.
  • the material normally used for such cans is tinplate.
  • the blackplate should be coated under the following conditions:
  • a method of the kind as mentioned in the preamble is known from US-A-4 378 390.
  • This publication discloses a method of coil coating at a relatively high speed a continuous layer of organic coating material on a strip.
  • a photogravure roll method is used, with a special device for supplying the coating material comprising a nozzle having a slit opening and a pump for pumping the coating material.
  • the object of the present invention is to solve the problem of coil coating blackplate with an organic material coating layer in a manner which is technically acceptable at the required strip speed and the required layer thickness.
  • the invention consists in that a screen printing process is used to apply the coating material, e.g. material containing a thermosetting resin, to the strip in a manner such that a continuous coating layer is produced, wherein in the screen printing process the coating material is passed in discrete portions through a plurality of apertures in a screen printing cylinder, and said portions are subsequently united into said continuous layer on the strip, the strip moving past the screen printing apparatus at a speed in the range 20 to 500 metres per minute and the rate of application of the coating material corresponding to a dry coating weight in the range 1 to 15 g/m 2.
  • the continuous layer may be of even thickness, but predetermined thickness variation may be employed.
  • Screen printing is known for the printing of strips of paper and textiles with ink or paint, the printing fluid being applied to the strip at spaced-apart regions, e.g. in the form of dots.
  • the printing fluid is forced through perforations or ducts from the inside of a hollow screen printing cylinder and applied onto the strip at locations spaced-apart according to the locations of the ducts.
  • the discrete portions, e.g. small points or dots, of coating material derived from the ducts in the screen printing cylinder are deposited and spread onto the strip, the quantity of coating material being applied to the strip being at least so much that a thin, continuous layer of coating material is obtained.
  • the spaced-apart condition of the small holes of the printing cylinder can no longer be found on the coated blackplate; a coherent coat of coating material is obtained which can be even, i.e. with a substantially constant coating weight.
  • Another advantage is that by using screen printing a coated blackplate with an extremely low coating weight can be obtained.
  • a further advantage is that the coating can be carried out at an extremely high strip speed.
  • the layer of coating material can be applied to blackplate from which thereafter drawn and wall-ironed or deep-drawn cans, for example, are to be manufactured. More generally, however, the layer of coating material can also be applied to a substrate of blackplate which, in addition to the blackplate just mentioned, also comprises blackplate which is provided with a pre-applied layer of another material, which layer forms an intermediate layer after final coating.
  • a substrate based on blackplate is the coating of ECCS (Electrolytic Chromium Chromium-oxide Steel). Coated ECCS is frequently used for the manufacture of can lids.
  • the coating material can be applied to conversion layers, such as for example a layer of phosphate, and to metal layers, e.g. of tin (Sn), chromium (Cr), nickel (Ni) and iron (Fe), and alloys and combinations thereof.
  • conversion layers such as for example a layer of phosphate
  • metal layers e.g. of tin (Sn), chromium (Cr), nickel (Ni) and iron (Fe), and alloys and combinations thereof.
  • the coating material applied may be dissolved preferably in an organic solvent, and may also be diluted by means of thinning agent (diluent).
  • the coating material to be applied may also be water-based, the water acting asthe carrier of the coating material. In all these cases the solvent/diluent orthe water may be driven off by heating the coated blackplate in a furnace, to obtain a dry layer of coating material with a corresponding dry coating weight.
  • the dry coating weight depends on the intended use of the coated blackplate. For drawn and wall-ironed cans, a dry coating weight of 5 g/m 2 or less will be sufficient. For deep-drawn cans, however, where the pre-coat is also the final coat, a dry coating weight of up to 15 g/m 2 may be specified.
  • the blackplate is coil coated, the coiled strip is brought to a coating line, and there coated upon uncoiling.
  • the strip speed during coating should preferably be in the range of 100 to 450 m/min, and the dry coating weight of the coat of lacquer should preferably be in the range of 2 to 10 g/m 2 .
  • a smooth applicator roll should preferably be used between the strip and the screen printing cylinder.
  • the small points or blobs of coating material are then first deposited on to the applicator roll by the screen printing cylinder, and may run together (coalesce) to some extent before being transferred to the blackplate.
  • Screen printing may be. used to apply a layer of coating material extending over the entire surface of the strip.
  • the coating material may alternatively be applied in a pattern on the strip surface, in accordance with the parts to be taken from the strip later for the can production. In the latter case the strip surface between the pattern regions may be coated with an extra thin layer of coating material to preserve the strip surface until subsequent processing.
  • Discs so-called blanks, for example, are taken from the strip thus coated, from which cans or lids for them are manufactured.
  • the strip can be coated on one side only, the strip should preferably be coated on both sides in one operation by screen printing processes in accordance with the invention. In this way coated material is manufactured in an efficient way.
  • the strip can be coated with coating weights which differ on the two sides of the strip, according to the desired coating weight on the inside and outside of the can.
  • the strip' may be coated with coating compositions which differ on the two sides of the strip.
  • the coating composition may differ in the type of coating material, in the quantity of solvent/diluent (thinner) etc.
  • a cold-rolled steel strip 1 is uncoiled from a coil 2 and fed to at least one screen printing unit 3 and/or 4, by which the strip is coated underneath and/or on top.
  • the coating is then dried, the solvent of the coating and the like being removed from the applied layer or layers of coating, and, if a thermosetting coating is used, the coating is cured.
  • the strip 1 is coiled into a coil 6.
  • Figure 2 shows a roller coating unit, known for coating cold-rolled steep strip for applications in civil engineering, comprising a smooth pick-up roll 7 dipping into the coating material in a pan 8.
  • a doctor blade 9 scrapes off excess of coating material picked up by the roll 7.
  • the material is transferred from the pick-.up roll 7 to the passing strip 1 by an applicator roll 12.
  • a backing roll 13 is provided on the other side of the strip.
  • the invention employs a screen printing process.
  • the coating unit used in the invention may be a unit for direct screen printing, see Figure 3A, comprising a perforated rotary screen cylinder 10 and a doctor blade 11 within the cylinder for pressing the coating material through the ducts (perforations) onto the strip 1.
  • the material is supplied to the interior of the cylinder.
  • the discrete portions of coating material applied to the strip by the screen printing unit spread out on the strip and run together to coalesce into a continuous and, at least locally, even coating layer which is subsequently dried and possibly cured, as described above.
  • FIG. 3B An applicator roll 12 of a wear resistant synthetic material such as rubber, is suitably arranged between the perforated cylinder 10 and the strip 1.
  • the clots of coating material applied to the surface of the applicator roll spread out before they are applied to the strip, and may partly coalesce on the applicator roll.
  • the strip is supported by a back-up roll 13 at the location of the coating units.
  • Two coating units for the two sides may be arranged one behind the other in the direction of strip transport, as shown in Figure 1, but they may alternatively be opposite each other (not shown). In this case the strip is supported by the opposed coating units instead of by back-up rolls.
  • Figure 1 shows diagrammatically a linear strip path; in practice an S-shaped strip path is frequently used in screen printing.
  • test results are summarised in the following table, giving the strip speed, the weight of the dry layer produced and the viscosity of the coating material.
  • test results are reproduced in Figure 4 graphically.
  • the strip speed is plotted along the horizontal axis and the coating weight is plotted along the vertical axis.
  • Figure 4A and 4B present the results of the reverse and forward roller coating. It is apparent that when coating by this method the coating weight increases with both strip speed and viscosity. Variations of coating weight arising from variations of strip speed and viscosity are difficult to control. Complicated, expensive control of the coating system is required. During the tests the pressing forces of the coating application system increased at high speeds. This led to failure of the coating application system at 250 m/ min. Even if this difficulty could be eliminated by modifying the design, a range of high coating weights is still encountered at higher speeds.
  • roller coating is not suitable for the application in question, i.e. coating blackplate for can production.
  • Figure 4C and 4D present the results of direct and indirect screen printing respectively.
  • This method of coating a practically horizontally characteristic was found, with a much lower value for the coating weight than with roller coating.
  • the coating weight is almost independent of the strip speed and viscosity of the coating material.
  • the value of the coating weight is determined by the dimensions and mesh (pattern) of the ducts in the screen printing cylinder. As shown by the tests, a coating material with a very high viscosity can be used and very low coating weights can be obtained.
  • the maximum speed was only 150 m/ min. There were no indications of possible difficulties at higher speeds.

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

Claims (10)

1. Verfahren zum Bandbeschichten einer Schicht organischen Beschichtungsmaterials auf ein Band (1) aus Schwarzblech oder einem Substrat auf Schwarzblechbasis zur Verwendung in der Herstellung von Dosen und/oder Dosenteilen, z.B. gezogene und wand-abgestreckte Dosen oder tiefgezogene Dosen, dadurch gekennzeichnet, daß zum Aufbringen des Beschichtungsmaterials auf das Band (1) ein Siebdruckverfahren in einer Weise so verwendet wird, daß eine kontinuierliche Überzugsschicht erzeugt wird, wobei beim Siebdruckverfahren das Beschichturigsmaterial in diskreten Portionen durch eine Vielzahl von Öffnungen in einem Siebdruckzylinder (10) geleitet wird und diese Portionen nachfolgend in diese kontinuierliche Schicht auf dem Band (1) vereinigt werden, wobei sich das Band (1) mit einer Geschwindigkeit im Bereich von 20 bis 500 Metern pro Minute an der Siebdruckvorrichtung (3, 4) vorbeibewegt und die Auftragstrate des Beschichtungsmaterials einem trockenen Überzugsgewicht im Bereich von 1 bis 15 g/m2 entspricht.
2. Verfahren gemäß Anspruch 1, wobei das Beschichtungsmaterial ein wärmehärtendes Harz enthält.
3. Verfahren gemäß Anspruch 1 oder Anspruch 2, wobei eine glatte Auftragswalze (12) das Beschichtungsmaterial vom Siebdruckzylinder (10) auf das Band (1) überträgt.
4. Verfahren gemäß Anspruch 3, wobei die Vereinigung der diskreten Portionen zumindest teilweise auf der Auftragswalze (12) stattfindet.
5. Verfahren gemäß irgendeinem der vorhergehenden Ansprüche, wobei die Überzugsschicht von gleichmäßiger Dicke ist.
6. Verfahren gemaß irgendeinem der vorhergehenden Ansprüche, wobei die Bandgeschwindigkeit gegenüber der Siebdruckvorrichtung (3,4) während des Beschichtens in Bereich von 100 bis 450 Meter pro Minute und das trockene Überzugsgewicht im Bereich von 2 bis 10 g/m2 liegen.
7. Verfahren gemäß irgendeinem der vorhergehenden Ansprüche, wobei das Band (1) in einem Arbeitsgang auf beiden Seiten beschichtet wird.
8. Verfahren gemäß Anspruch 7, wobei das Band (1) auf beiden Seiten des Bandes (1) mit verschiedenen Überzugsgewichten beschichtet wird.
9. Verfahren gemäß Anspruch 7 oder Anspruch 8, wobei das Band (1) mit verschiedenen Überzugszusammensetzungen auf beiden Seiten des Bandes (1) beschichtet wird.
EP85103211A 1985-03-20 1985-03-20 Bandbeschichtungsverfahren von Schwarzblech oder Substrat auf Schwarzblechbasis zu gebrauchen bei der Herstellung von Dosen oder Dosenteilen Expired EP0195099B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8585103211T DE3562991D1 (en) 1985-03-20 1985-03-20 Method of coil coating a strip of blackplate or a substrate based on blackplate intended for use in the manufacture of cans and/or can parts
EP85103211A EP0195099B1 (de) 1985-03-20 1985-03-20 Bandbeschichtungsverfahren von Schwarzblech oder Substrat auf Schwarzblechbasis zu gebrauchen bei der Herstellung von Dosen oder Dosenteilen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85103211A EP0195099B1 (de) 1985-03-20 1985-03-20 Bandbeschichtungsverfahren von Schwarzblech oder Substrat auf Schwarzblechbasis zu gebrauchen bei der Herstellung von Dosen oder Dosenteilen

Publications (2)

Publication Number Publication Date
EP0195099A1 EP0195099A1 (de) 1986-09-24
EP0195099B1 true EP0195099B1 (de) 1988-06-01

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EP85103211A Expired EP0195099B1 (de) 1985-03-20 1985-03-20 Bandbeschichtungsverfahren von Schwarzblech oder Substrat auf Schwarzblechbasis zu gebrauchen bei der Herstellung von Dosen oder Dosenteilen

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EP (1) EP0195099B1 (de)
DE (1) DE3562991D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2664065C2 (ru) * 2014-07-08 2018-08-14 Тиссенкрупп Стил Юроп Аг Способ нанесения покрытия на полосовой металлопрокат, технологическая линия для нанесения покрытия на полосовой металлопрокат

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10020102A1 (de) 2000-04-22 2001-10-25 Beiersdorf Ag Verfahren und Vorrichtung zum Auftragen hochviskoser Flüssigkeiten
DE10020101A1 (de) * 2000-04-22 2001-10-25 Beiersdorf Ag Verfahren zum Auftragen von flüssigen, pastösen oder plastischen Substanzen auf ein Substrat

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7006063A (de) * 1970-04-26 1971-10-28
US4032678A (en) * 1974-09-12 1977-06-28 Bethlehem Steel Corporation Coated sheet metal and method of forming products therefrom
DE2833377C3 (de) * 1978-07-29 1981-02-12 Nippon Steel Corp., Tokio Verfahren zum Aufbringen von"·*08"" Beschichtungsmaterial auf ein Metallband sowie Vorrichtung zur Durchführung dieses Verfahrens
FR2513596B1 (fr) * 1981-09-30 1985-09-06 Basuyaux Patrick Procede de coloration d'un couvercle de boite de peinture par une teinte identique a celle du contenu

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2664065C2 (ru) * 2014-07-08 2018-08-14 Тиссенкрупп Стил Юроп Аг Способ нанесения покрытия на полосовой металлопрокат, технологическая линия для нанесения покрытия на полосовой металлопрокат

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Publication number Publication date
DE3562991D1 (en) 1988-07-07
EP0195099A1 (de) 1986-09-24

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