GB2362845A - Coated baking foil - Google Patents
Coated baking foil Download PDFInfo
- Publication number
- GB2362845A GB2362845A GB0013523A GB0013523A GB2362845A GB 2362845 A GB2362845 A GB 2362845A GB 0013523 A GB0013523 A GB 0013523A GB 0013523 A GB0013523 A GB 0013523A GB 2362845 A GB2362845 A GB 2362845A
- Authority
- GB
- United Kingdom
- Prior art keywords
- foil
- coated
- baking
- coating
- polytetrafluoroethylene
- 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.)
- Withdrawn
Links
- 239000011888 foil Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 34
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 32
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 32
- 238000000576 coating method Methods 0.000 claims abstract description 27
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 25
- 229920000642 polymer Polymers 0.000 claims abstract description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 16
- 239000004411 aluminium Substances 0.000 claims abstract description 15
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 239000004695 Polyether sulfone Substances 0.000 claims abstract description 5
- 229920006393 polyether sulfone Polymers 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims abstract description 4
- 230000005855 radiation Effects 0.000 claims abstract description 3
- 238000007761 roller coating Methods 0.000 claims abstract description 3
- 239000005030 aluminium foil Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000007767 bonding agent Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000005507 spraying Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229920002313 fluoropolymer Polymers 0.000 description 3
- 239000004811 fluoropolymer Substances 0.000 description 3
- 125000000524 functional group Chemical group 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000010411 cooking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A21—BAKING; EDIBLE DOUGHS
- A21B—BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
- A21B3/00—Parts or accessories of ovens
- A21B3/15—Baking sheets; Baking boards
-
- 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
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
- B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/18—Homopolymers or copolymers of tetrafluoroethene
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
-
- 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
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Food Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
A baking foil is coated by applying polytetrafluoroethylene or other perfluoro carbon-based polymer to a sheet of aluminium and subjecting the foil to a temperature of 340 to 480{C to cure the polytetrafluoroethylene or other perfluoro carbon-based polymer on the aluminum. The coating may be applied by spraying, roller coating, reverse/forward/direct/offset gravure process or as a powder. The heat may be applied by means of an oven, heated roller or infrared radiation. A binding resin such as polyethersulfone may act between the coating and the aluminium.
Description
1 - COATED BAKING FOIL 2362845 This invention relates to a method of
coating a baking foil and to the foil so produced.
It is well known to coat rigid bakeware to provide it with a nonstick coating to prevent adherence of cooking materials to the cooking surface. The usual material applied is a polymer such as polytetrafluoroethylene (PTFE) or a PTFE co-polymer such as FEP or PFA. It is common to use a binder resin such as phenolic and epoxy, or PES, or a PTFE co-polymer such as PFA or FEP to attach the PTE to the aluminium surface. The curing of the PTFE onto the rigid bakeware substrate is normally achieved in ovens at temperatures at around 350-390'C.
However, coated baking foils have hitherto been coated with materials other than PTFE.
According to one aspect of the present invention, there is provided a method of coating a baking foil comprising a sheet of substantially pure aluminium, the method including applying a coatirg of polytetrafluoroethylene or other perfluoro carb-)n-based polymer to the foil and subjecting the coated foil to heat at a temperature in a range of substantially 340480'C to cure t,e polytetrafluoroethylene or other perfluoro carbon-based polymer on the aluminium.
The polytetrafluoroethylene or other perfluoro carbon-based polymer may be sprayed on the baking foil prior to heating.
Alternatively, the polytetrafluoroethylene or other perfluoro carbonbased polymer may be coated on the baking foil prior to heating by using a roller coating technique.
Other methods of applying the coating can include a reverse/forward/direct/offset gravure process, meniscus, slot die, curtain, reverse roll, powder and electrostatic powder application, lithographic or plasma deposition or plasma polymerisation.
A PTFE co-polymer such as FEP (a co-polymer of TFE and hexafluoropropylene) or PFA (perfluoroethylene) or PVDF (polyvinylidene fluoride) could be used instead of polytetrafluoroethylene.
The baking foil so produced can be in the form of a roll or could be sheeted so as, for example, to produce an interleaved product.
Especially in the case of polytetrafluoroethylene, a binder resin dissolved in a solvent could be used as a bonding agent acting between the aluminium foil and the coating. The resin could be PES (polyethersulfone).
To avoid the need for the binder resin, the fluoropolymer with functional groups on it could be used. In particular, a fluoropolymer with functional groups capable of bonding to aluminium could be applied from an aqueous solution.
Another possibility is to apply a two layer coating with the first layer being a primer/coupling agent in the form of a silane or a fluoropolymer with functional groups capable of bonding to aluminium and a top layer of PTFE.
Preferably, the aluminium foil has an overall thickness range of between 6 and 20 pm. More preferably, the thickness range could be between 11 and 16 pm.
The coating of polytetrafluoroethylene or other perfluoro carbon-based polymer should be of as thin as possible a gauge and preferably to have a thickness of substantially 0.5 - 2.0 pm to provide good performance.
The baking foil is preferably in the form of an elongate strip capable of being coiled into a roll and the preferred speed of the elongate strip past the heating means is between substantially 30 and 1000 m. per minute, and preferably between 150 and 300 m. per minute.
The invention also extends to a coated baking foil produced by a method essentially as defined above.
According to a second aspect of the present invention, there is provided a baking foil comprising a sheet of substantially pure aluminium having coated thereon a layer of polytetrafluoroethylene or other perfluoro carbon-based polymer, the baking foil having been produced by applying the layer of polytetrafluoroethylene or other perfluoro carbon-based polymer to the foil and heating the coated foil to a temperature in a range of substantially 340 - 4800C to - 4 cure the layer of polytetrafluoroethylene or other perfluoro carbon-based polymer on the aluminium.
The foil may be heated by passing through an oven. In addition or instead, a heated roller and/or infrared radiation could be used.
The baking foil so produced can be given any of the other attributes of material and thickness defined above in any feasible combination.
For a better understanding of the invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawing, in which the single Figure is a diagrammatic view of an apparatus to coat a baking foil.
The drawing shows an elongate strip of baking foil 1 of substantially pure aluminium which is unwound from a roll 2 and passed by a coating station 3 containing the polymer such as PTFE. One surface of the aluminium foil is coated by passing it between a coating roller 4, which collected the polymer from the coating station 3, and a squeeze roller 5.
The foil is then passed through an oven 6 with an internal temperature of preferably between 410 - 4300C (but the range could be greater than that) to cure the PTFE onto the foil surface. Leaving the oven 6, the coated foil 1 is then woi:nd onto a rewind roll 7 or fed directly to another station for further processing/packaging.
- When solvent based solutions are used, the temperature is increased slowly at first to remove the solvent by evaporation without boiling it.
The foil could be coated and dried first and later cured at the required higher temperature.
Preferably, the coating should only be of the order of one particle thick (as opposed to similar coatings on rigid bakeware which have coatings of multi-particle thickness). With a coating that is only one particle thick, it is important for the coating to melt and/or flow or be sintered together to cover the aluminium foil fully. One option in this process is to provide a polymer component that comprises a mixture of small particle sizes to obtain better coverage through gap filling effects.
- 6
Claims (1)
1. A method of coating a baking foil comprising a sheet of substantially pure aluminium, the method including applying a coating of polytetrafluoroethylene or other perfluoro carbon-based polymer to the foil and subjecting the coated foil to heat at a temperature in a range of substantially 340-4800C to cure the polytetrafluoroethylene or other perfluoro carbon-based polymer on the aluminium.
2. A method according to claim 1, wherein the polytetrafluoroethylene or other perfluoro carbon-based polymer is sprayed on the baking foil prior to heating.
3. A method according to claim 1, wherein the polytetrafluoroethylene or other perfluoro carbonbased polymer is coated on the baking foil prior to heating by using a roller coating technique.
4. A method according to claim 1, wherein the polytetrafluoroethylene or other perfluoro carbon-based polymer is coated on the baking foil by a reverse/forward/direct/offset gravure process.
5. A method according to claim 1, wherein the polytetrafluoroethylene or other perfluoro carbon-based polymer is coated on the baking foil by a powder application.
6. A method according to any one of the preceding claims, wherein said other polymer is a PTFE co-polymer.
- 7 7. A method according to any one of the preceding claims, wherein the coated foil is subjected to heat at a temperature in a range of substantially 410' - 4300 C.
8. A method according to any one of the preceding claims, wherein said coated foil is subjected to heat to cure the coating by passing the foil through an oven.
9. A method according to any one of the preceding claims, wherein said coated foil is subjected to heat to cure the coating by passing the foil over a heated roller.
10. A method according to any one of the preceding claims, wherein said coated foil is subjected to heat to cure the coating by using infrared radiation.
11. A method according to any one of the preceding claims, and including the step of using a binder resin as a bonding agent acting between the aluminium foil and the coating.
12. A method according to claim 11, wherein the resin is polyethersulfone.
13. A method according to any one of the preceding claims, and using an aluminium foil that has an overall thickness range of between 6 and 20 pm.
14. A method according to claim 13, wherein said thickness ranges between 11 and 16 pm.
-i 0 22. A coated baking foil produced by according to any one of the preceding claims.
23. A baking foil comprising a substantially pure aluminium having coated layer of polytetrafluoroethylene or other carbon-based polymer, the baking foil having 15. A method according to any one of the preceding claims, wherein the coating applied to the aluminium foil has a thickness of substantially 0. 5 - 2.0 pm.
16. A method according to any one of the preceding claims, wherein the baking foil is in the form of a strip capable of being coiled into a roll.
17. A method according to any one of the preceding claims, wherein the baking foil passes through or past the heating means to cure the coating on the aluminium at between substantially 30 and 1000 m. per minute.
18. A method according to claim 17, wherein said speed is between 150 and 300 m. per minute.
19. A method according to any one of the preceding claims, wherein the baking foil so coated is produced in the form of a roll.
20. A method according to any one of claims 1 to 18, wherein the baking foil so coated is produced as an interleaved product.
21. A method of coating a baking foil according to claim 1, substantially as hereinbefore described.
a method sheet of thereon a perfluoro been produced by applying the layer of polytetrafluoroethylene or other perfluoro carbon-based polymer to the foil and heating the coated foil to a temperature in a range of substantially 340' to 380' C to cure the layer of polytetrafluoroethylene or other perfluoro carbon-based polymer on the aluminium.
24. A baking foil according to claim 23, wherein the aluminium foil has an overall thickness range of between 6 and 20 pm.
25. A baking foil according to claim 23 or 24, wherein said coating has a thickness of substantially 0.5 to 2. 0 pm.
26. A baking foil according to any one of claims 22 to 25, substantially as hereinbefore described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0013523A GB2362845A (en) | 2000-06-02 | 2000-06-02 | Coated baking foil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0013523A GB2362845A (en) | 2000-06-02 | 2000-06-02 | Coated baking foil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0013523D0 GB0013523D0 (en) | 2000-07-26 |
| GB2362845A true GB2362845A (en) | 2001-12-05 |
Family
ID=9892923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0013523A Withdrawn GB2362845A (en) | 2000-06-02 | 2000-06-02 | Coated baking foil |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2362845A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008059909A1 (en) * | 2008-12-02 | 2010-06-10 | Paul Hettich Gmbh & Co. Kg | Process for the production of fittings, side rails and food carriers for high-temperature applications and metallic component |
| ES2385155A1 (en) * | 2010-12-22 | 2012-07-19 | Bsh Electrodomesticos España, S.A. | Oven muffle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1019202A (en) * | 1963-06-28 | 1966-02-02 | Telefex Inc | Coating compositions for protecting and lubricating surfaces |
| FR2053530A5 (en) * | 1969-07-08 | 1971-04-16 | Nachmansohn Baruch | Disposable ptfe-coated lining for cookingor |
| JPS61149275A (en) * | 1984-12-22 | 1986-07-07 | Sumitomo Electric Ind Ltd | Method for applying fluorocarbon resin to aluminum foil or aluminum alloy foil |
| JPH01317755A (en) * | 1988-06-18 | 1989-12-22 | Sumitomo Electric Ind Ltd | Tetrafluoroethylene resin coating method |
| US5654075A (en) * | 1996-04-17 | 1997-08-05 | Ramirez; Yvette | Food preparation foil |
-
2000
- 2000-06-02 GB GB0013523A patent/GB2362845A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1019202A (en) * | 1963-06-28 | 1966-02-02 | Telefex Inc | Coating compositions for protecting and lubricating surfaces |
| FR2053530A5 (en) * | 1969-07-08 | 1971-04-16 | Nachmansohn Baruch | Disposable ptfe-coated lining for cookingor |
| JPS61149275A (en) * | 1984-12-22 | 1986-07-07 | Sumitomo Electric Ind Ltd | Method for applying fluorocarbon resin to aluminum foil or aluminum alloy foil |
| JPH01317755A (en) * | 1988-06-18 | 1989-12-22 | Sumitomo Electric Ind Ltd | Tetrafluoroethylene resin coating method |
| US5654075A (en) * | 1996-04-17 | 1997-08-05 | Ramirez; Yvette | Food preparation foil |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008059909A1 (en) * | 2008-12-02 | 2010-06-10 | Paul Hettich Gmbh & Co. Kg | Process for the production of fittings, side rails and food carriers for high-temperature applications and metallic component |
| EP2373829B1 (en) * | 2008-12-02 | 2018-03-07 | Paul Hettich GmbH & Co. KG | Process for manufacturing fittings, cooking oven rails, grates or trays for high temperature applications and product thus obtained |
| ES2385155A1 (en) * | 2010-12-22 | 2012-07-19 | Bsh Electrodomesticos España, S.A. | Oven muffle |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0013523D0 (en) | 2000-07-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| COOA | Change in applicant's name or ownership of the application | ||
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |