GB2362845A - Coated baking foil - Google Patents

Coated baking foil Download PDF

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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Withdrawn
Application number
GB0013523A
Other versions
GB0013523D0 (en
Inventor
Tristan Allen
Paul Briskham
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.)
SOUTHERN GRAPHIC SYSTEMS
Baco Consumer Products Ltd
Original Assignee
SOUTHERN GRAPHIC SYSTEMS
Baco Consumer Products Ltd
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 SOUTHERN GRAPHIC SYSTEMS, Baco Consumer Products Ltd filed Critical SOUTHERN GRAPHIC SYSTEMS
Priority to GB0013523A priority Critical patent/GB2362845A/en
Publication of GB0013523D0 publication Critical patent/GB0013523D0/en
Publication of GB2362845A publication Critical patent/GB2362845A/en
Withdrawn legal-status Critical Current

Links

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.
GB0013523A 2000-06-02 2000-06-02 Coated baking foil Withdrawn GB2362845A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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 Coating method of tetrafluoroethylene resin
US5654075A (en) * 1996-04-17 1997-08-05 Ramirez; Yvette Food preparation foil

Patent Citations (5)

* Cited by examiner, † Cited by third party
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 Coating method of tetrafluoroethylene resin
US5654075A (en) * 1996-04-17 1997-08-05 Ramirez; Yvette Food preparation foil

Cited By (3)

* Cited by examiner, † Cited by third party
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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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)