EP3830846B1 - Method of applying hydrophilic coatings - Google Patents

Method of applying hydrophilic coatings Download PDF

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Publication number
EP3830846B1
EP3830846B1 EP19752149.5A EP19752149A EP3830846B1 EP 3830846 B1 EP3830846 B1 EP 3830846B1 EP 19752149 A EP19752149 A EP 19752149A EP 3830846 B1 EP3830846 B1 EP 3830846B1
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EP
European Patent Office
Prior art keywords
wire
coating
vessel
water
previous
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EP19752149.5A
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German (de)
French (fr)
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EP3830846A1 (en
Inventor
Helge Pfeiffer
Martine Wevers
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Katholieke Universiteit Leuven
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Katholieke Universiteit Leuven
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • H01B19/04—Treating the surfaces, e.g. applying coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • H01B19/02—Drying; Impregnating

Definitions

  • the present invention relates generally to a system that applies hydrophilic coatings on wires in a quasi-continuous process. This allowing high-throughput manufacturing of respective devices. More specifically the invention concerns a system that applies hydrophilic coatings on sensing wires. Such a system is able to apply the specific coating in a continuous process or quasi-continuous process allowing high-throughput manufacturing of respective devices. This system is used to manufacture sensing wires that are applied for monitoring of potentially defect structures suffering from e.g. adverse moisture ingress.
  • the present invention solves the problems of the related art by using a system whereby the wire is drawn through a vessel filled with the raw, aqueous coating material and which is dried afterwards by a hot airstream that is conducted by a dedicated pipe.
  • the present invention provides a method of coating a wire with an outer insulation coating and an inner conductive coating between said wire and outer insulation coating, characterised in that the to be coated wire comprises an outer material made of hydrophilic textile and further characterized in that this wire is passed through a first coating vessel comprising an aqueous medium comprising a water-solution of a conductive coating material, followed by a respective drying unit, thereafter through a second coating vessel comprising an solution of a non-conductive polymer coating material and finally again through a drying unit.
  • a method of coating a wire comprising an outer material made of hydrophilic textile, characterised in that 1) the to be coated wire is released over a bobbin into a first vessel comprising an aqueous medium comprising a water-solution of a conductive polymer coating material and further comprising a non-conductive material, 2) through an aperture at the bottom of said vessel, said outlet aperture having a diameter size value that is the value of the thickness of the wire and the thickness new coating, through 3) a first wire guide drying channel into 4) a second vessel comprising an aqueous medium comprising a water-soluble non-conductive material, 5) through an aperture at the bottom of said vessel, said outlet aperture having a diameter size value that is the value of the thickness of the wire and the thickness new second coating and 6) through a second wire guide drying channel onto a receiving bobbin.
  • This techniques described above may be embodied as the receiving bobbin having a motorized computer steered function.
  • Some of the techniques described above may be embodied as a method whereby the wire is passed through a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and further comprising a titanium carbon nitride (TiCN) or titanium aluminium nitride (TiAIN or AITiN), thereafter through a drying unit, thereafter through a second coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and finally through a drying unit or some of the techniques described above may be embodied as a method, whereby the wire is passed through a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and further comprising graphite, for instance graphite particles, thereafter through a drying unit, thereafter through a second coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and finally through a drying unit.
  • a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic
  • the wire is passed through a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and a titanium carbon nitride, thereafter through a drying unit, thereafter through a second coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and finally through a drying unit.
  • the wire is passed through a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and further comprising titanium carbon nitride (TiCN) or titanium aluminium nitride (TiAIN or AITiN) or graphite or a combination thereof, thereafter through a drying unit, thereafter through a second coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and finally through a drying unit.
  • a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and further comprising titanium carbon nitride (TiCN) or titanium aluminium nitride (TiAIN or AITiN) or graphite or a combination thereof
  • the method of present invention provides that the wire leaves the vessel at a lower outlet having a diameter which is only a few larger than the diameter of the wire, a layer being 1 to 5 mm.
  • the method of present invention provides that the vessel is filled with an aqueous coating material.
  • the method of present invention provides that the vessel is filled with an aqueous medium comprising a water-soluble synthetic polymer coating material.
  • the method of present invention provides that the wire after the coating vessel passes through a drying unit.
  • the coating vessel the wire can pass through a drying unit which comprises a wire guidance channel or a drying pipe.
  • the wire after leaving the vessel can be transported through a pipe where a hot airstream for instance through an air drier.
  • the method of present invention provides that the velocity of the wire transport is computer-steered and wire passes a wire guidance channel or a drying pipe with a length that is adapted so that the coating can sufficiently dry on its way through the pipe or guidance.
  • the method of present invention provides that the wire is passed through a first coating vessel leaving the first vessel through its outlet aperture, thereafter through a drying unit, thereafter through a second coating vessel leaving the second vessel through its outlet aperture and finally through a drying unit.
  • the method of present invention provides that the wire already covered with the dried functional coating is again transported through a second vessel with another aqueous coating material wire leaves the new vessel again at a lower outlet of the second vessel.
  • the method of present invention provides that the water-soluble synthetic polymer coating material is the water-soluble synthetic polymer polyvinylalcohol (also known as PVOH, PVA, or PVAL).
  • the water-soluble synthetic polymer polyvinylalcohol also known as PVOH, PVA, or PVAL.
  • the method of present invention provides that the polyvinylalcohol is crosslinked for enhancing water-resistance of the coating material.
  • the method of present invention provides that no pressure extrusion is used and the application is at room temperature.
  • the method according to the present invention further comprises that the coated wire is winded-up at another for instance on a motorized bobbin.
  • Present invention involves an method for applying hydrophilic coatings comprising a bobbin which continuously releases the raw wire that is via a computer-steered motor transported through a vessel containing the raw, aqueous coating material. In this way, the wire is completely surrounded by the coating material.
  • the wire leaves the vessel at a lower outlet having a diameter which is only a few larger than the diameter of the wire.
  • This can furthermore comprise that the wire after leaving the vessel is freely transported through a pipe where a hot airstream is present created by a dedicated air drier.
  • the velocity of the computer-steered wire transport and the length of the drying pipe is optimised that the coating can sufficiently dry on its way through the pipe.
  • the wire already covered with the dried functional coating is again transported through a second vessel with another aqueous coating material, e.g. a new, protective coating. Also here, the wire is completely surrounded by the new coating material.
  • the wire leaves the new vessel again at a lower outlet having a diameter which is only a few larger than the diameter of the coated wire.
  • Another particular aspect of the invention is that the wire after leaving the vessel is freely transported through a pipe where a hot airstream is present created by a dedicated air drier.
  • the velocity of the computer-steered wire transport and the length of the drying pipe is optimised that the coating can sufficiently dry on its way through the pipe.
  • raw wire comprises an outer material made of hydrophilic textile enabling appropriate coating of the wire regarding its wetting properties and a homogenous distribution of the coating around on the wire surface.
  • coated wire is winded-up at another, e.g. motorized bobbin.
  • FIG. 1 is a graphic that shows the set-up of the mechanism where the coating with a sensitive material, such as Titanium Carbon Nitride (TiCN) and a water-soluble synthetic polymer such as Poly(vinyl alcohol) (PVOH, PVA, or PVAI).
  • the graphic displays a deflection sheave 1, the first vessel 2 for coating material, the first pipe or channel with drying facility 3, the second vessel for coating material 4, the second pipe or channel with drying facility 5, the computer steered motorized bobbin for receiving the double coated wire 6 and the bobbin for receiving the raw or the to be coated wire 7.
  • the values 400, 15, 100 and 40 are optional distances in cm.

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Description

    Background and Summary BACKGROUND OF THE INVENTION A. Field of the Invention
  • The present invention relates generally to a system that applies hydrophilic coatings on wires in a quasi-continuous process. This allowing high-throughput manufacturing of respective devices. More specifically the invention concerns a system that applies hydrophilic coatings on sensing wires. Such a system is able to apply the specific coating in a continuous process or quasi-continuous process allowing high-throughput manufacturing of respective devices. This system is used to manufacture sensing wires that are applied for monitoring of potentially defect structures suffering from e.g. adverse moisture ingress.
    • B. Description of the Related Art
  • Nowadays, the application of coatings for different kind of wires is usually performed by pressure extrusion performed at high temperature whereby thermoplastic coatings are applied on the respective wire-materials. There are however only a few industrial processes known where a high-throughput application of hydrophilic coatings is possible. US2211584A discloses a conductive wire, coated with an inner insulation layer and outer conductive layer. Both layers are coated onto the wire through a coating vessel, drying the coating, passing the coating through another coating vessel with a different coating solution and optionally repeating the process several times.
    • SUMMARY OF THE INVENTION
  • The present invention solves the problems of the related art by using a system whereby the wire is drawn through a vessel filled with the raw, aqueous coating material and which is dried afterwards by a hot airstream that is conducted by a dedicated pipe.
  • The present invention provides a method of coating a wire with an outer insulation coating and an inner conductive coating between said wire and outer insulation coating, characterised in that the to be coated wire comprises an outer material made of hydrophilic textile and further characterized in that this wire is passed through a first coating vessel comprising an aqueous medium comprising a water-solution of a conductive coating material, followed by a respective drying unit, thereafter through a second coating vessel comprising an solution of a non-conductive polymer coating material and finally again through a drying unit.
  • In another embodiment of the invention a method of coating a wire is provided the method comprising an outer material made of hydrophilic textile, characterised in that 1) the to be coated wire is released over a bobbin into a first vessel comprising an aqueous medium comprising a water-solution of a conductive polymer coating material and further comprising a non-conductive material, 2) through an aperture at the bottom of said vessel, said outlet aperture having a diameter size value that is the value of the thickness of the wire and the thickness new coating, through 3) a first wire guide drying channel into 4) a second vessel comprising an aqueous medium comprising a water-soluble non-conductive material, 5) through an aperture at the bottom of said vessel, said outlet aperture having a diameter size value that is the value of the thickness of the wire and the thickness new second coating and 6) through a second wire guide drying channel onto a receiving bobbin. This techniques described above may be embodied as the receiving bobbin having a motorized computer steered function.
  • Some of the techniques described above may be embodied as a method whereby the wire is passed through a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and further comprising a titanium carbon nitride (TiCN) or titanium aluminium nitride (TiAIN or AITiN), thereafter through a drying unit, thereafter through a second coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and finally through a drying unit or some of the techniques described above may be embodied as a method, whereby the wire is passed through a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and further comprising graphite, for instance graphite particles, thereafter through a drying unit, thereafter through a second coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and finally through a drying unit.
  • In particular embodiment of the invention, the wire is passed through a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and a titanium carbon nitride, thereafter through a drying unit, thereafter through a second coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and finally through a drying unit.
  • In yet another particular embodiment of the invention, the wire is passed through a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and further comprising titanium carbon nitride (TiCN) or titanium aluminium nitride (TiAIN or AITiN) or graphite or a combination thereof, thereafter through a drying unit, thereafter through a second coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and finally through a drying unit.
  • In another aspect, the method of present invention provides that the wire leaves the vessel at a lower outlet having a diameter which is only a few larger than the diameter of the wire, a layer being 1 to 5 mm.
  • In yet another aspect, the method of present invention provides that the vessel is filled with an aqueous coating material.
  • In yet another aspect, the method of present invention provides that the vessel is filled with an aqueous medium comprising a water-soluble synthetic polymer coating material.
  • In yet another aspect, the method of present invention provides that the wire after the coating vessel passes through a drying unit. Hereby the coating vessel the wire can pass through a drying unit which comprises a wire guidance channel or a drying pipe. Hereby the wire after leaving the vessel can be transported through a pipe where a hot airstream for instance through an air drier.
  • In yet another aspect, the method of present invention provides that the velocity of the wire transport is computer-steered and wire passes a wire guidance channel or a drying pipe with a length that is adapted so that the coating can sufficiently dry on its way through the pipe or guidance.
  • In yet another aspect, the method of present invention provides that the wire is passed through a first coating vessel leaving the first vessel through its outlet aperture, thereafter through a drying unit, thereafter through a second coating vessel leaving the second vessel through its outlet aperture and finally through a drying unit.
  • In yet another aspect, the method of present invention provides that the wire already covered with the dried functional coating is again transported through a second vessel with another aqueous coating material wire leaves the new vessel again at a lower outlet of the second vessel.
  • In yet another aspect, the method of present invention provides that the water-soluble synthetic polymer coating material is the water-soluble synthetic polymer polyvinylalcohol (also known as PVOH, PVA, or PVAL).
  • In yet another aspect, the method of present invention provides that the polyvinylalcohol is crosslinked for enhancing water-resistance of the coating material.
  • By using the inventive method it is possible to produce textile wire that is at its elongate surface completely surrounded by the coating material.
  • By using the inventive method it is possible to produce textile wire that is at its elongate surface completely surrounded by the coating material in a continuous process and to have the textile comprising a conductive layer coat surrendered by a non-conductive outer or surface coat. Moreover by using the inventive method it is possible to produce coated textile wires with hydrophilic coatings in a high-throughput manufacturing process.
  • In yet another aspect, the method of present invention provides that no pressure extrusion is used and the application is at room temperature.
  • In an advantageous embodiment, the method according to the present invention further comprises that the coated wire is winded-up at another for instance on a motorized bobbin.
    • Detailed Description DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION
  • Present invention involves an method for applying hydrophilic coatings comprising a bobbin which continuously releases the raw wire that is via a computer-steered motor transported through a vessel containing the raw, aqueous coating material. In this way, the wire is completely surrounded by the coating material. The wire leaves the vessel at a lower outlet having a diameter which is only a few larger than the diameter of the wire. This can furthermore comprise that the wire after leaving the vessel is freely transported through a pipe where a hot airstream is present created by a dedicated air drier. The velocity of the computer-steered wire transport and the length of the drying pipe is optimised that the coating can sufficiently dry on its way through the pipe.
  • In a particular embodiment the wire already covered with the dried functional coating is again transported through a second vessel with another aqueous coating material, e.g. a new, protective coating. Also here, the wire is completely surrounded by the new coating material. The wire leaves the new vessel again at a lower outlet having a diameter which is only a few larger than the diameter of the coated wire.
  • Another particular aspect of the invention is that the wire after leaving the vessel is freely transported through a pipe where a hot airstream is present created by a dedicated air drier.
  • The velocity of the computer-steered wire transport and the length of the drying pipe is optimised that the coating can sufficiently dry on its way through the pipe.
  • Particular suitable for the system of coating is a to use raw wire comprises an outer material made of hydrophilic textile enabling appropriate coating of the wire regarding its wetting properties and a homogenous distribution of the coating around on the wire surface.
  • Finally another aspect of the invention can be that the coated wire is winded-up at another, e.g. motorized bobbin.
    • Drawing Description
  • FIG. 1 is a graphic that shows the set-up of the mechanism where the coating with a sensitive material, such as Titanium Carbon Nitride (TiCN) and a water-soluble synthetic polymer such as Poly(vinyl alcohol) (PVOH, PVA, or PVAI). The graphic displays a deflection sheave 1, the first vessel 2 for coating material, the first pipe or channel with drying facility 3, the second vessel for coating material 4, the second pipe or channel with drying facility 5, the computer steered motorized bobbin for receiving the double coated wire 6 and the bobbin for receiving the raw or the to be coated wire 7. The values 400, 15, 100 and 40 are optional distances in cm.

Claims (14)

  1. A method of coating a wire with an outer insulation coating and an inner conductive coating between said wire and outer insulation coating, characterized in that the to be coated wire comprises an outer material made of hydrophilic textile and further characterized in that this wire is passed through a first coating vessel comprising an aqueous medium comprising a water-solution of a conductive coating material, followed by a respective drying unit, thereafter through a second coating vessel comprising an solution of a non-conductive polymer coating material and finally again through a drying unit.
  2. A method of coating a wire comprising an outer material made of hydrophilic textile, characterised in that 1) the to be coated wire is released over a bobbin into a first vessel comprising an aqueous medium comprising a water-solution of a conductive polymer coating material and further comprising a non-conductive material, 2) through an aperture at the bottom of said vessel, said outlet aperture having a diameter size value that is the value of the thickness of the wire and the thickness new coating, through 3) a first wire guide drying channel into 4) a second vessel comprising a comprising an aqueous medium comprising a water-soluble non-conductive material, 5) through an aperture at the bottom of said vessel, said outlet aperture having a diameter size value that is the value of the thickness of the wire and the thickness new second coating and 6) through a second wire guide drying channel onto a receiving bobbin.
  3. The method according to any one of the previous claims 1 to 2, whereby the wire is passed through a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and further comprising titanium carbon nitride (TiCN) or titanium aluminium nitride (TiAIN or AITiN) or further comprising graphite, thereafter through a drying unit, thereafter through a second coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and finally through a drying unit.
  4. The method according to any one of the previous claims 1 to 3, whereby the wire is passed through a first coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and a titanium carbon nitride, thereafter through a drying unit, thereafter through a second coating vessel comprising an aqueous medium comprising a water-soluble synthetic polymer coating material and finally though a drying unit.
  5. The method according to any one of the claims 1 to 4, whereby the velocity of the wire transport is computer-steered and wire passes a wire guidance channel or a drying pipe with a length that is adapted so that the coating can sufficiently dry on its way through the pipe or guidance.
  6. The method according to any one of the previous claims 1 to 5, whereby the wire is passed through a first coating vessel leaving the first vessel through its outlet aperture, thereafter through a drying unit, thereafter through a second coating vessel leaving the second vessel through its outlet aperture and finally through a drying unit.
  7. The method according to any one of the previous claims 1 to 6, wherein the wire already covered with the dried functional coating is again transported through a second vessel with another aqueous coating material wire leaves the new vessel again at a lower outlet of the second vessel.
  8. The method according to any one of the previous claims 1 to 7, whereby the water-soluble synthetic polymer coating material is the water-soluble synthetic polymer polyvinylalcohol (also known as PVOH, PVA, or PVAL).
  9. The method according to claim 8, whereby the polyvinylalcohol is crosslinked for enhancing water-resistance of the coating material.
  10. The method according any one of the previous claims to produce textile wire that is at its elongate surface completely surrounded by the coating material.
  11. The method according to any one of the previous claims 1 to 10, whereby no pressure extrusion is used and the application is at room temperature.
  12. The method according to any one of the previous claims 1 to 11, to produce coated wires in a high-throughput manufacturing process.
  13. The method according to any one of the previous claims 1 to 11 to produce coated wires with hydrophilic coatings in a high-throughput manufacturing process.
  14. The use of method according to any one of the previous claims, to manufacture a wire shaped sensor.
EP19752149.5A 2018-08-02 2019-08-02 Method of applying hydrophilic coatings Active EP3830846B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1812602.9A GB201812602D0 (en) 2018-08-02 2018-08-02 Extruder for applying hydrophilic coatings
PCT/EP2019/070914 WO2020025804A1 (en) 2018-08-02 2019-08-02 Method of applying hydrophilic coatings

Publications (2)

Publication Number Publication Date
EP3830846A1 EP3830846A1 (en) 2021-06-09
EP3830846B1 true EP3830846B1 (en) 2022-04-20

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EP19752149.5A Active EP3830846B1 (en) 2018-08-02 2019-08-02 Method of applying hydrophilic coatings

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GB (1) GB201812602D0 (en)
WO (1) WO2020025804A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114029189B (en) * 2022-01-10 2022-03-18 江苏骏源新材料有限公司 Surface treatment equipment for processing insulating material

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* Cited by examiner, † Cited by third party
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US2211584A (en) * 1937-10-09 1940-08-13 Ruben Samuel Coaxial electrical conductor
US20050109522A1 (en) * 2003-11-25 2005-05-26 Midcon Cables Co., L.L.C., Joplin, Mo Conductive TEFLON film tape for EMI/RFI shielding and method of manufacture
US8182880B2 (en) * 2009-01-28 2012-05-22 Honeywell International Inc. Methods of manufacturing flexible insulated wires

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GB201812602D0 (en) 2018-09-19
WO2020025804A1 (en) 2020-02-06
EP3830846A1 (en) 2021-06-09

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