EP0201268B1 - Process for producing pre-coated metal sheet - Google Patents
Process for producing pre-coated metal sheet Download PDFInfo
- Publication number
- EP0201268B1 EP0201268B1 EP19860303245 EP86303245A EP0201268B1 EP 0201268 B1 EP0201268 B1 EP 0201268B1 EP 19860303245 EP19860303245 EP 19860303245 EP 86303245 A EP86303245 A EP 86303245A EP 0201268 B1 EP0201268 B1 EP 0201268B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- sheet
- printing medium
- process according
- applying
- 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
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
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/546—No clear coat specified each layer being cured, at least partially, separately
-
- 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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
-
- 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
-
- 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
Definitions
- This invention relates to a process of producing pre-coated metal sheet having a surface decoration and suitable for use in the manufacture of bekeware and other products intended for use at high temperatures.
- Such pre-coated metal sheet is used in the production of bakeware and other products by various manufacturing methods including: pressing; stamping; roll-forming and deep drawing. It avoids the necessity of applying a coated finish to the product after the manufacturing process which for some products can present difficulties both in the application of a coated finish and in the obtaining of an acceptable finish.
- the coating may be applied in a continuous process, for example in a manner similar to that disclosed in US Patent Specification No. 4,485,132 which describes a method of continuous coating a metal sheet.
- the pre-coated metal sheet which has been produced for use in the manufacture of bakeware and other products intended for use at high temperatures has had a plain finish; it has not had patterns, printing or other surface decoration on it.
- the present invention provides pre-coated metal sheet which has a surface decoration.
- the coated sheet may be produced in flat form but preferably it is coiled.
- the reverse roll method that is by having the roller means and sheet moving in opposite directions where they make contact for the application of the coating to the sheet, the deposition of the coating on the sheet can be closely controlled, which assists in obtaining a good quality coated finish on the sheet. Applying the coating without opposition of movement between the roller means and sheet is possible but the deposition of the coating on the sheet may be more difficult to control.
- the printing medium may be applied by roller means or possibly by silk screen printing means.
- the coating may be applied to both sides of the sheet.
- the printing medium may also be applied to both sides or just to one of them, depending upon the manufacture in which the coated sheet is intended to be used.
- the coating may be opaque, translucent or metallic.
- the examples of coatings mentioned will withstand usual pressing and forming operations to which the coated sheet may be subjected in the manufacture of a product.
- PES and the non-stick materials will withstand more difficult forming and deep drawing operations.
- a protective strippable film for example of polyethylene, may be applied to the coated sheet after the printing medium has been applied. That film will be removed after the product has been formed.
- the printing medium which is applied to the coating must be compatible with the coating material. Generally it will contain the same base constituent as the coating material although concentrations of that constituent and of solvent and pigment will vary to suit the application of the printing medium by the roller means.
- the sheets may be of mild or stainless steel, aluminium or its alloys, or possibly other metals, including clad metals such as Hi-Top or aluminized steel.
- the sheet will be of a thickness of 0.25 to 1.00 mm when the sheet is of steel or up to 1.5 mm if the sheet is of aluminium.
- the printing medium will be applied to a thickness which is about a quarter of that of the coating.
- raw steel or aluminium strip 1 which initially is in a coil 2, is wound off the coil and taken through a series of tensioning rollers 3 to a degreasing station 4 at which a hot alkali degreasing agent is sprayed on the two sides of the strip to remove soluble foreign matter.
- a degreasing station 4 at which a hot alkali degreasing agent is sprayed on the two sides of the strip to remove soluble foreign matter.
- the strip passes between abrasive brushing rollers 5 which remove insoluble contaminants from the strip. It then passes on to a washing station 6 at which it is rinsed with hot water to wash away the alkali and contaminants loosened by the brushing rollers 5.
- the strip After the coating station 10 the strip is taken through a baking oven 13 at a peak oven temperature of 400-430°C for 60 seconds to dry off solvents of the coatings and bake the coatings. From the baking oven the coated strip passes through a cooling station 14 where it is cooled by water jets before being taken through a series of rollers 15 and being wound back into a coil 16.
- Each of the coatings on the strips is plain and extends over the full surface of the side of the strip to which it is applied.
- the coated strip is subsequently wound off the coil 16, taken through tensioning rollers 17 and on by way of other guide rollers 18 to a printing station 19, at the printing station 19 a printing medium is applied for example as a decorative pattern, to the PES coating of the strip by means of a suitably embossed roller 20 which operates on the forward roll method, that is it is rotating in the direction of movement of the strip, the speed of travel of the strip and the rotational speed of the roller being synchronised to ensure good definition in the pattern printed on the strip.
- a suitable printing medium is that supplied by Crown Decorative Products Limited under the name Crown Coilprint 500.
- the coated and printed strip is taken through a curing oven 21 where the printing medium is cured. Typically when Crown Coilprint 500 is applied as the printing medium the strip is heated in the curing oven at a peak metal temperature of 400-430°C for 60 seconds. Upon leaving the curing oven 21 the coated and printed strip is cooled at a cooling station 22 by water jets and passed round a series of rollers 23 before finally being wound into a coil 24 again.
- a portion of the coated strip with the pattern printed on it is shown in Figure 3.
- Other patterns, or other decoration, may be printed on the coated strip, as desired.
- the coated strip instead of being coiled between the coating and printing stages, the coated strip, after having been passed through the baking oven and cooled, could pass dierctly on to the printing station for the application of the printing meduim, and from there through the curing oven and further cooling station before being wound into a coil.
- the film may be applied to the strip by rollers after the curing oven and the final cooling station.
Description
- This invention relates to a process of producing pre-coated metal sheet having a surface decoration and suitable for use in the manufacture of bekeware and other products intended for use at high temperatures.
- Such pre-coated metal sheet is used in the production of bakeware and other products by various manufacturing methods including: pressing; stamping; roll-forming and deep drawing. It avoids the necessity of applying a coated finish to the product after the manufacturing process which for some products can present difficulties both in the application of a coated finish and in the obtaining of an acceptable finish.
- The coating may be applied in a continuous process, for example in a manner similar to that disclosed in US Patent Specification No. 4,485,132 which describes a method of continuous coating a metal sheet.
- Hitherto the pre-coated metal sheet which has been produced for use in the manufacture of bakeware and other products intended for use at high temperatures has had a plain finish; it has not had patterns, printing or other surface decoration on it. The present invention provides pre-coated metal sheet which has a surface decoration.
- According to the present invention there is provided a process characterised in that it comprises performing on a travelling metal sheet in strips form the continuous steps of successively cleaning a surface of the sheet, applying a bonding agent to the cleaned surface, applying over the bonding agent by roller means a coating composition comprising a solvent based paint which is heat-stable at temperatures of 250°C and higher and provides a flexible finished coating, and baking the coating at a temperature in the range of 350°C to 450°C to dry the coating, and the subsequent continuous steps of applying a decoration on to the baked coating by a pigmented printing medium compatible with the coating composition and curing the applied printing medium to fix it on the coating.
- The coated sheet may be produced in flat form but preferably it is coiled. By applying the coating by the reverse roll method, that is by having the roller means and sheet moving in opposite directions where they make contact for the application of the coating to the sheet, the deposition of the coating on the sheet can be closely controlled, which assists in obtaining a good quality coated finish on the sheet. Applying the coating without opposition of movement between the roller means and sheet is possible but the deposition of the coating on the sheet may be more difficult to control.
- The printing medium may be applied by roller means or possibly by silk screen printing means.
- The coating may be applied to both sides of the sheet. When the coating is applied to both sides the printing medium may also be applied to both sides or just to one of them, depending upon the manufacture in which the coated sheet is intended to be used.
- Some examples of suitable materials for the coating are heat resistant lacquers, a polyethylene sulphonate (PES) for flame and very high temperature resistance, and non-stick materials such as Fluon, Nuon, Teflon and Xylan (registered trade marks). Different coating materials may be used on the two sides of the sheet. For example, for use in the manufacture of some bakeware products the side of the sheet which will be at the exterior of a product may be coated with PES and the opposite side may be coated with a non-stick material.
- The coating may be opaque, translucent or metallic.
- In general the examples of coatings mentioned will withstand usual pressing and forming operations to which the coated sheet may be subjected in the manufacture of a product. PES and the non-stick materials will withstand more difficult forming and deep drawing operations. For extreme conditions of manufacture involving rough handling and severe forming, or where the surface finish of a product made from the coated sheet is particularly critical a protective strippable film, for example of polyethylene, may be applied to the coated sheet after the printing medium has been applied. That film will be removed after the product has been formed.
- The printing medium which is applied to the coating must be compatible with the coating material. Generally it will contain the same base constituent as the coating material although concentrations of that constituent and of solvent and pigment will vary to suit the application of the printing medium by the roller means.
- The sheets may be of mild or stainless steel, aluminium or its alloys, or possibly other metals, including clad metals such as Hi-Top or aluminized steel.
- Typically the sheet will be of a thickness of 0.25 to 1.00 mm when the sheet is of steel or up to 1.5 mm if the sheet is of aluminium.
- In general the printing medium will be applied to a thickness which is about a quarter of that of the coating.
- An embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:
- Figures 1 and 2 are schematic layouts respectively of a coil-coating line for carrying out on strip metal sheet the coating stage of the process according to the present invention, and a line for carrying out the stage of applying the printing medium to the coated strip metal sheet, and
- Figure 3 is a plan view of a portion of the strip metal sheet after the printing medium has been applied to it.
- For convenience the process will be described as applied to the production of pre-coated steel or aluminum sheet in strip form which is intended to be used for the manufacture of bakeware products capable of withstanding high temperatures of 250°C and higher.
- Referring to Figure 1, raw steel or aluminium strip 1, which initially is in a
coil 2, is wound off the coil and taken through a series oftensioning rollers 3 to adegreasing station 4 at which a hot alkali degreasing agent is sprayed on the two sides of the strip to remove soluble foreign matter. From thedegreasing station 4 the strip passes betweenabrasive brushing rollers 5 which remove insoluble contaminants from the strip. It then passes on to a washing station 6 at which it is rinsed with hot water to wash away the alkali and contaminants loosened by thebrushing rollers 5. Next the cleansed strip has a chemical bonding agent (for example a chromate) applied to it by rollers 8 before entering anoven 7 where any moisture remaining on the strip is driven off. From the oven the strip is directed overvarious rollers 9 to acoating station 10 at which coatings are applied to both surfaces of the strip by respective sets of applicatingrollers coating station 10 the strip is taken through abaking oven 13 at a peak oven temperature of 400-430°C for 60 seconds to dry off solvents of the coatings and bake the coatings. From the baking oven the coated strip passes through acooling station 14 where it is cooled by water jets before being taken through a series ofrollers 15 and being wound back into acoil 16. - Each of the coatings on the strips is plain and extends over the full surface of the side of the strip to which it is applied.
- For the next stage of the method reference is to be had to Figure 2 of the accompanying drawings. The coated strip is subsequently wound off the
coil 16, taken through tensioning rollers 17 and on by way of other guide rollers 18 to a printing station 19, at the printing station 19 a printing medium is applied for example as a decorative pattern, to the PES coating of the strip by means of a suitably embossed roller 20 which operates on the forward roll method, that is it is rotating in the direction of movement of the strip, the speed of travel of the strip and the rotational speed of the roller being synchronised to ensure good definition in the pattern printed on the strip. A suitable printing medium is that supplied by Crown Decorative Products Limited under the name Crown Coilprint 500. From the printing station 19 the coated and printed strip is taken through a curing oven 21 where the printing medium is cured. Typically when Crown Coilprint 500 is applied as the printing medium the strip is heated in the curing oven at a peak metal temperature of 400-430°C for 60 seconds. Upon leaving the curing oven 21 the coated and printed strip is cooled at a cooling station 22 by water jets and passed round a series of rollers 23 before finally being wound into a coil 24 again. - A portion of the coated strip with the pattern printed on it is shown in Figure 3. Other patterns, or other decoration, may be printed on the coated strip, as desired.
- The resultant coated and printed strip is ready for use in the manufacture of bakeware products by known pressing or other forming operations.
- Instead of being coiled between the coating and printing stages, the coated strip, after having been passed through the baking oven and cooled, could pass dierctly on to the printing station for the application of the printing meduim, and from there through the curing oven and further cooling station before being wound into a coil.
- If a protective strippable film is required to be added to the coated and printed strip before the strip is subjected to the product manufacturing operations, the film may be applied to the strip by rollers after the curing oven and the final cooling station.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08511308A GB2174315B (en) | 1985-05-03 | 1985-05-03 | Improvements relating to pre-coated metal sheet suitable for use in the manufacture of bakeware and other products intended for use at high temperatures |
GB8511308 | 1985-05-03 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0201268A2 EP0201268A2 (en) | 1986-11-12 |
EP0201268A3 EP0201268A3 (en) | 1987-07-01 |
EP0201268B1 true EP0201268B1 (en) | 1989-10-04 |
Family
ID=10578617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19860303245 Expired EP0201268B1 (en) | 1985-05-03 | 1986-04-29 | Process for producing pre-coated metal sheet |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0201268B1 (en) |
DE (1) | DE3666000D1 (en) |
ES (1) | ES8706484A1 (en) |
GB (1) | GB2174315B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8814863B2 (en) | 2005-05-12 | 2014-08-26 | Innovatech, Llc | Electrosurgical electrode and method of manufacturing same |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5728455A (en) * | 1994-12-22 | 1998-03-17 | E. I. Du Pont De Nemours And Company | Randomly patterned cookware |
WO1996019300A1 (en) * | 1994-12-22 | 1996-06-27 | E.I. Du Pont De Nemours And Company | Cookware with smooth-rough pattern |
US5711995A (en) * | 1994-12-22 | 1998-01-27 | E. I. Du Pont De Nemours And Company | Angle spraying of cookware |
US5707688A (en) * | 1994-12-22 | 1998-01-13 | E. I. Du Pont De Nemours And Company | Multi-color patterned cookware |
US5667891A (en) * | 1996-01-12 | 1997-09-16 | E. I. Du Pont De Nemours And Company | Randomly patterned cookware |
DE10027444A1 (en) * | 2000-06-02 | 2002-02-14 | Basf Coatings Ag | Coil coating process with powder coating dispersions (powder slurries) |
US8814861B2 (en) | 2005-05-12 | 2014-08-26 | Innovatech, Llc | Electrosurgical electrode and method of manufacturing same |
DE102014109548A1 (en) | 2014-07-08 | 2016-01-14 | Thyssenkrupp Ag | Strip coating process for producing a semi-finished product having a surface structure |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE716107A (en) * | 1967-06-05 | 1968-11-04 | ||
US4054704A (en) * | 1974-09-27 | 1977-10-18 | E. I. Du Pont De Nemours And Company | Process for decorating coatings produced by heat-stable polymer compositions |
GB1558464A (en) * | 1975-07-29 | 1980-01-03 | Metal Box Co Ltd | Method and apparatus for providing flame cured coatings |
US4259375A (en) * | 1979-05-31 | 1981-03-31 | E. I. Du Pont De Nemours And Company | Decorative process |
GB2120956B (en) * | 1982-05-26 | 1985-12-04 | Setsco Private Limited | Process for decorative surface colouring and frosting |
-
1985
- 1985-05-03 GB GB08511308A patent/GB2174315B/en not_active Expired
-
1986
- 1986-04-29 EP EP19860303245 patent/EP0201268B1/en not_active Expired
- 1986-04-29 DE DE8686303245T patent/DE3666000D1/en not_active Expired
- 1986-04-30 ES ES554622A patent/ES8706484A1/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8814863B2 (en) | 2005-05-12 | 2014-08-26 | Innovatech, Llc | Electrosurgical electrode and method of manufacturing same |
US8814862B2 (en) | 2005-05-12 | 2014-08-26 | Innovatech, Llc | Electrosurgical electrode and method of manufacturing same |
Also Published As
Publication number | Publication date |
---|---|
EP0201268A3 (en) | 1987-07-01 |
ES8706484A1 (en) | 1987-07-01 |
ES554622A0 (en) | 1987-07-01 |
EP0201268A2 (en) | 1986-11-12 |
GB8511308D0 (en) | 1985-06-12 |
GB2174315A (en) | 1986-11-05 |
GB2174315B (en) | 1988-10-19 |
DE3666000D1 (en) | 1989-11-09 |
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