WO1997021542A1 - A method of applying a polymer film to a metal sheet - Google Patents

A method of applying a polymer film to a metal sheet Download PDF

Info

Publication number
WO1997021542A1
WO1997021542A1 PCT/SE1996/001651 SE9601651W WO9721542A1 WO 1997021542 A1 WO1997021542 A1 WO 1997021542A1 SE 9601651 W SE9601651 W SE 9601651W WO 9721542 A1 WO9721542 A1 WO 9721542A1
Authority
WO
WIPO (PCT)
Prior art keywords
adhesive
film
conversion coating
metal
powder
Prior art date
Application number
PCT/SE1996/001651
Other languages
French (fr)
Inventor
Ulf Tivander
Per-Erik Sundell
Original Assignee
SSAB Tunnplåt AB
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 SSAB Tunnplåt AB filed Critical SSAB Tunnplåt AB
Priority to AU11135/97A priority Critical patent/AU1113597A/en
Publication of WO1997021542A1 publication Critical patent/WO1997021542A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B05D5/10—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an adhesive surface
    • 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
    • B05D7/51—One specific pretreatment, e.g. phosphatation, chromatation, in combination with one specific coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
    • B32B2037/1238—Heat-activated adhesive in the form of powder

Definitions

  • This invention relates to a method of applying, by means of rollers, a polymer film to a metal sheet or strip that is provided with an adhesive.
  • an adhesive is applied to a metal strip as a solution and when the solvent has evaporated, the metal strip is coiled. In a laminating line, the strip is uncoiled, the adhesive is heated and the film is calendered to the metal strip. In the same way, a film can be calendered to metal sheets cut to size.
  • the adhesive is applied as a dry electrostratic powder, the powder is heated so that it melts and the film is calendered to the metal.
  • the metal surface should have a conversion coating that includes an organic component.
  • the conversion coating is applied as a water solution that is dried and it is thinner than 3 ⁇ m.
  • the line compises a hydraulic table 11, a handler 12, a spray powder booth, 13 a furnace 14, a laminator 15, a cooler 16, a roller way table 17 and a handler that includes a table 18 on which the sheets are piled.
  • a handler that includes a table 18 on which the sheets are piled.
  • knives that are not illustrated in the Figure.
  • the line has roller ways for transporting the cut-to-size metal sheets from the handler 12 to the table 18 Roller ways 19, 20 can be seen on both sides of the booth 13
  • the laminator 15 has two rollers 25, 26 and four polymer film coils 27-30 In the figure, the film coil 27 is in action, that is, its film 31 is conveyed in between the rollers 25, 26. The operator can quickly change film by connecting any one of the three other film coils 28-30 instead of the film coil 31
  • the metal sheets e g steel sheets are in a pile 32 on the table 11, the height of which is adjusted so that the handler 12 can take the uppermost sheet and put it on the roller way 12 which in turn conveys the sheet into the spray booth 13
  • the spray booth has a plurality of conventional powder guns that eject sprays of electrostatically charged powder so that the powder is applied in an even layer on the sheet which is earthed
  • the sheet is then conveyed by the roller way 20 to the furnace in which the powder and the sheet is heated so that the powder melts to an even layer of adhesive on the sheet Directly from the furnace, the sheet is conveyed in between the rollers 25, 26 so that the film 31 is calendered to the adhesive side of the metal sheet
  • the polymer film 31 is somewhat wider than the sheet
  • the sheets should lengthwise be as close to one another as possible when they pass the rollers 25, 26, and directly after passing the rollers, the film between the sheets is cut away, the film extending out from the side edges of the sheets is cut away, and the sheets are water
  • the film can be laminated to a metal strip in the same way
  • the strip is in a coil and it is uncoiled, laminated with the polymer film and again coiled
  • the film can for example be a film of polyvinylchloride, polypropylene, polyethylene, polyester or fluorinated polyolefins.
  • the adhesive can be based on one or more polymers It can for example be based on polyester, acryl, or epoxy It can be thermosetting or UV-curing An adhesive that is
  • thermosetting and UV-curing can also be used.
  • UV-curing the adhesive is exposed to UV radiation after the melting of the powder so that the curing is initiated before the film is applied. The curing takes some time and the film will be applied before the curing is completed. Neither will a thermosetting adhesive be finally cured until the film is applied. It is no disadvantage that the adhesive starts to cure before the film is applied; it is merely advantageous since the film will always adhere more strongly to the adhesive that the adhesive to the metal surface.
  • the powder should preferably contain an additive that lowers the viscosity when the powder melts.
  • the metal surface should have a conversion coating that compises an organic components.
  • the metal sheet or strip can have its conversion coating when delivered to the laminating line.
  • the pretreatment can be carried out with a water solution that compises one or more polymers with groups that chelates with or in another way co-ordinates with the oxide on the metal surface. Such groups can be amino groups, hydroxyl groups or carboxyl groups.
  • the pretreatment can also be carried out directly in the laminating line.
  • the solution for pretreatment can for example include physically or chemically drying binders, for example acrylics or polyesters, and the resulting conversion coating can typically have a thickness of 0.1 - 5 ⁇ m, preferably 0.1 - 1 ⁇ m.
  • the conversion coating may contain active corrosion inhibitors for example chromates, but it can also be chromate free.
  • the chemistry of the curing and drying of the adhesive can preferably be so adapted to the conversion coating that there will be a direct chemical bond between the conversion coating and the adhesive.
  • the furnace can for example be a convection furnace, an induction furnace or an IR furnace.
  • the metal sheet or strip can be a cold rolled steel sheet or strip or a
  • SUBSTITUTE SHEET galvanised steel sheet or strip for example a hot dip galvanised steel sheet or strip with a coating of zinc or an alloy of aluminium and zinc.
  • the metal sheet or strip can also be an aluminium strip.

Landscapes

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

Abstract

A polymer film is laminated to a metal sheet or strip. In one and the same line and in sequence, an adhesive is applied as a dry electrostatic powder, the powder is heated so that it melts and the film is calendered to the metal. The metal sheet or strip has a conversion coating that contains an organic component. The conversion coating is applied as a water solution that is dried to leave a conversion coating that is preferably thinner than 1 νm. The organic component in the conversion coating makes the adhesive adhere better to the metal.

Description

A method of applying a polymer film to a metal sheet
This invention relates to a method of applying, by means of rollers, a polymer film to a metal sheet or strip that is provided with an adhesive.
Conventionally, an adhesive is applied to a metal strip as a solution and when the solvent has evaporated, the metal strip is coiled. In a laminating line, the strip is uncoiled, the adhesive is heated and the film is calendered to the metal strip. In the same way, a film can be calendered to metal sheets cut to size.
It is an object ofthe invention to simplify the process and to make it more ecologic.
According to the invention, in principle, the adhesive is applied as a dry electrostratic powder, the powder is heated so that it melts and the film is calendered to the metal. The metal surface should have a conversion coating that includes an organic component. The conversion coating is applied as a water solution that is dried and it is thinner than 3 μm.
Since an adhesive in the form of a dry powder is used, there will be no evaporation of solvents and since the pretreatment solution is water based, the entire process is solvent free.
The invention will be described in more detail with reference to the accompanying drawing that shows schematically a line for applying a film to cut-to-size metal sheets.
The line compises a hydraulic table 11, a handler 12, a spray powder booth, 13 a furnace 14, a laminator 15, a cooler 16, a roller way table 17 and a handler that includes a table 18 on which the sheets are piled. In connection with the cooler 16, there are knives that are not illustrated in the Figure.
SUBSTITUTE SHEET The line has roller ways for transporting the cut-to-size metal sheets from the handler 12 to the table 18 Roller ways 19, 20 can be seen on both sides of the booth 13 The laminator 15 has two rollers 25, 26 and four polymer film coils 27-30 In the figure, the film coil 27 is in action, that is, its film 31 is conveyed in between the rollers 25, 26. The operator can quickly change film by connecting any one of the three other film coils 28-30 instead of the film coil 31
The process of laminating will now be described The metal sheets e g steel sheets are in a pile 32 on the table 11, the height of which is adjusted so that the handler 12 can take the uppermost sheet and put it on the roller way 12 which in turn conveys the sheet into the spray booth 13 The spray booth has a plurality of conventional powder guns that eject sprays of electrostatically charged powder so that the powder is applied in an even layer on the sheet which is earthed The sheet is then conveyed by the roller way 20 to the furnace in which the powder and the sheet is heated so that the powder melts to an even layer of adhesive on the sheet Directly from the furnace, the sheet is conveyed in between the rollers 25, 26 so that the film 31 is calendered to the adhesive side of the metal sheet The polymer film 31 is somewhat wider than the sheet The sheets should lengthwise be as close to one another as possible when they pass the rollers 25, 26, and directly after passing the rollers, the film between the sheets is cut away, the film extending out from the side edges of the sheets is cut away, and the sheets are water cooled in the cooler 16 Then, the sheets moves out onto the roller way 17 and are piled on the table 18
Instead of laminating the film to cut-to-size sheets, the film can be laminated to a metal strip in the same way The strip is in a coil and it is uncoiled, laminated with the polymer film and again coiled
The film can for example be a film of polyvinylchloride, polypropylene, polyethylene, polyester or fluorinated polyolefins.
The adhesive can be based on one or more polymers It can for example be based on polyester, acryl, or epoxy It can be thermosetting or UV-curing An adhesive that is
SUBSTITUTE SHEET both thermosetting and UV-curing can also be used. When UV-curing is used, the adhesive is exposed to UV radiation after the melting of the powder so that the curing is initiated before the film is applied. The curing takes some time and the film will be applied before the curing is completed. Neither will a thermosetting adhesive be finally cured until the film is applied. It is no disadvantage that the adhesive starts to cure before the film is applied; it is merely advantageous since the film will always adhere more strongly to the adhesive that the adhesive to the metal surface. The powder should preferably contain an additive that lowers the viscosity when the powder melts.
In order to make the adhesive adhere better to the metal surface, the metal surface should have a conversion coating that compises an organic components. The metal sheet or strip can have its conversion coating when delivered to the laminating line. The pretreatment can be carried out with a water solution that compises one or more polymers with groups that chelates with or in another way co-ordinates with the oxide on the metal surface. Such groups can be amino groups, hydroxyl groups or carboxyl groups. The pretreatment can also be carried out directly in the laminating line.
The solution for pretreatment can for example include physically or chemically drying binders, for example acrylics or polyesters, and the resulting conversion coating can typically have a thickness of 0.1 - 5 μm, preferably 0.1 - 1 μm.
The conversion coating may contain active corrosion inhibitors for example chromates, but it can also be chromate free.
The chemistry of the curing and drying of the adhesive can preferably be so adapted to the conversion coating that there will be a direct chemical bond between the conversion coating and the adhesive.
The furnace can for example be a convection furnace, an induction furnace or an IR furnace. The metal sheet or strip can be a cold rolled steel sheet or strip or a
SUBSTITUTE SHEET galvanised steel sheet or strip, for example a hot dip galvanised steel sheet or strip with a coating of zinc or an alloy of aluminium and zinc. The metal sheet or strip can also be an aluminium strip.
SUBSTITUTE SHEET

Claims

Claims
1 A method of applying, by means of rollers, a polymer film to a metal sheet or strip that is provided with an adhesive, characterized in that a pretreatment water solution is applied to the metal surface and dried to a conversion coating that contains an organic component and is thinner than 3 μm, and then, the adhesive is applied as a dry electrostatic powder, the powder is heated so that it melts and the film is calendered to the metal.
2 A method according to claim 1, characteri zed in that a pretreatment water solution is used that leaves a conversion coating thinner than 2μm.
3 A method according to claim 2 characterised in that a pretreatment water solution is used that leaves a conversion coating thinner than 1 μm.
4 A method according to any one ofthe preceding claims, characterized in that a chrome free pretreatment water solution is used.
5 A method according to any one ofthe preceding claims, charac t e ri ze d in that an adhesive is used that is based on one or more thermosetting or UV-curing polymers.
6 A method according to any one ofthe preceding claims, characterized in that a powder is used that has an additive that lowers the viscosity ofthe molten powder.
SUBSTITUTE SHEET
PCT/SE1996/001651 1995-12-13 1996-12-12 A method of applying a polymer film to a metal sheet WO1997021542A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11135/97A AU1113597A (en) 1995-12-13 1996-12-12 A method of applying a polymer film to a metal sheet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9504459A SE9504459L (en) 1995-12-13 1995-12-13 Ways to laminate a sheet
SE9504459-0 1995-12-13

Publications (1)

Publication Number Publication Date
WO1997021542A1 true WO1997021542A1 (en) 1997-06-19

Family

ID=20400575

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/001651 WO1997021542A1 (en) 1995-12-13 1996-12-12 A method of applying a polymer film to a metal sheet

Country Status (3)

Country Link
AU (1) AU1113597A (en)
SE (1) SE9504459L (en)
WO (1) WO1997021542A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1022247C2 (en) * 2002-12-23 2004-06-24 Stichting Fmlc Method for manufacturing a composite / metal laminate, semi-finished product for use in this method and composite / metal laminate thus produced.
WO2006102858A2 (en) 2005-04-01 2006-10-05 Billhöfer Maschinenfabrik Gmbh & Co.Kg Device and method for coating a metallic support material
WO2006102957A2 (en) * 2005-04-01 2006-10-05 Jowat Ag Method for laminating flat support materials on substrates
EP2322329A1 (en) 2009-11-13 2011-05-18 Steinemann Technology AG Laminating method and method and device for separating laminate

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303581A (en) * 1980-07-16 1981-12-01 Ppg Industries, Inc. Water dispersed primer-surfacer composition
US4345004A (en) * 1980-04-30 1982-08-17 Hercules Incorporated Process for forming a coated film of an olefinic resin
US4552605A (en) * 1978-07-17 1985-11-12 Toyo Seikan Kaisha Limited Utilizing particulate adhesive for laminating plastic film to the surface of metal
EP0648823A1 (en) * 1993-10-15 1995-04-19 Betz Europe, Inc. Composition and process for coating metals
EP0686501A1 (en) * 1994-05-12 1995-12-13 Siquam S.P.A. A process for multilayer coating sheet metal strips in coil or plate form, and thus obtained product

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4552605A (en) * 1978-07-17 1985-11-12 Toyo Seikan Kaisha Limited Utilizing particulate adhesive for laminating plastic film to the surface of metal
US4345004A (en) * 1980-04-30 1982-08-17 Hercules Incorporated Process for forming a coated film of an olefinic resin
US4303581A (en) * 1980-07-16 1981-12-01 Ppg Industries, Inc. Water dispersed primer-surfacer composition
EP0648823A1 (en) * 1993-10-15 1995-04-19 Betz Europe, Inc. Composition and process for coating metals
EP0686501A1 (en) * 1994-05-12 1995-12-13 Siquam S.P.A. A process for multilayer coating sheet metal strips in coil or plate form, and thus obtained product

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1022247C2 (en) * 2002-12-23 2004-06-24 Stichting Fmlc Method for manufacturing a composite / metal laminate, semi-finished product for use in this method and composite / metal laminate thus produced.
WO2004056566A1 (en) * 2002-12-23 2004-07-08 Stichting Fmlc Method for manufacturing a composite/metal laminate, half-product for use in this method, and thus manufactured composite/metal laminate
WO2006102858A2 (en) 2005-04-01 2006-10-05 Billhöfer Maschinenfabrik Gmbh & Co.Kg Device and method for coating a metallic support material
WO2006102957A2 (en) * 2005-04-01 2006-10-05 Jowat Ag Method for laminating flat support materials on substrates
WO2006102858A3 (en) * 2005-04-01 2007-01-04 Billhofer Maschf Gmbh Device and method for coating a metallic support material
WO2006102957A3 (en) * 2005-04-01 2007-01-18 Jowat Ag Method for laminating flat support materials on substrates
JP2008535688A (en) * 2005-04-01 2008-09-04 イオヴァット アーゲー Method for laminating a planar support material on a substrate
EA010937B1 (en) * 2005-04-01 2008-12-30 Йоват Аг Method for laminating flat support materials on substrate
US9242430B2 (en) 2005-04-01 2016-01-26 Jowat Ag Method for laminating flat support materials on substrates
EP2322329A1 (en) 2009-11-13 2011-05-18 Steinemann Technology AG Laminating method and method and device for separating laminate
DE102009053097A1 (en) 2009-11-13 2011-07-21 Steinemann Technology Ag Laminating method and method and apparatus for separating laminate

Also Published As

Publication number Publication date
SE9504459D0 (en) 1995-12-13
AU1113597A (en) 1997-07-03
SE9504459L (en) 1997-06-14

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