Heating film with uniform far infrared radiation

Abstract

The utility model provides a heating film with uniform far infrared radiation. The heating film comprises a circuit pattern formed by compounding a conductive layer and a far infrared radiation layer; the sealing insulating layers are arranged on the two sides of the circuit pattern; the electrode transition layer is arranged between the sealing insulating layer and the conductive layer or between the sealing insulating layer and the infrared radiation layer; the circuit patterns are uniformly arranged in the heating film, and the whole circuit patterns are in circuit conduction. According to the utility model, the conductive layer and the far-infrared radiation layer are compounded to form the circuit pattern, so that not only can the capabilities of heating impedance, uniform heating and uniform far-infrared radiation be satisfied through the fine pattern design, but also the double-layer arrangement of the conductive layer and the far-infrared radiation layer is more reliable, not easy to break and fall off, and easier to process; and the application scene of the flexible heating film is greatly improved. And even heating can be realized under the condition that the circuit pattern accounts for 10%-90% of the area of the heating film.

Description

Technical Field

[0001] The present application relates to the technical field of heating films, and in particular to a heating film with uniform far-infrared radiation. Background Art

[0002] In the field of heating, flexible heating film is an important core component. At present, the flexible heating films mainly include metal etching heating film and carbon coating heating film, but both have defects: 1. The metal etching heating film has no far-infrared radiation, the physical therapy effect is not good, and the wet etching solution will cause certain environmental pollution, and the process is not ideal. 2. Carbon coating heating films such as graphene coatings and carbon nanotube coatings, although they realize the far-infrared radiation function, it is difficult to achieve uniform heating in the set area. The existing rectangular blocks and special-shaped curved carbon coating heating films either cannot completely cover the entire heating film (such as heating eye masks, heating insoles, heating gloves, etc.), and cannot form a large area of ​​uniform heating area, or there will be uneven heating in the curved part, and it is impossible to heat evenly in the special-shaped heating body. The degree of heating precision does not meet the requirements, and it is difficult to meet the requirements of heating power and heating uniformity.

[0003] Therefore, providing a heating film with uniform heating temperature and radiation characteristics in the far infrared band becomes a problem to be solved. Utility Model Content

[0004] In view of the above problems, the utility model provides a heating film with uniform far-infrared radiation. The heating film provided by the utility model can be used on special-shaped parts, has uniform heating temperature, and has radiation characteristics in the far-infrared band.

[0005] The utility model provides a heating film with uniform far-infrared radiation, comprising:

[0006] A circuit pattern composed of a conductive layer and a far-infrared radiation layer;

[0007] A sealing insulating layer disposed on both sides of the circuit pattern;

[0008] An electrode transition layer disposed between the sealing insulating layer and the conductive layer or between the sealing insulating layer and the infrared radiation layer;

[0009] The circuit pattern is evenly arranged in the heating film, and the entire circuit pattern is electrically conductive.

[0010] The utility model also provides a heating film with uniform far-infrared radiation, comprising:

[0011] A circuit pattern composed of a conductive layer and a far-infrared radiation layer;

[0012] A sealing insulating layer disposed on both sides of the circuit pattern;

[0013] An electrode transition layer is arranged between the infrared radiation layer and the sealing insulation layer, and an electrode hole is arranged on the surface of the sealing insulation layer on one side of the infrared radiation layer, and the electrode hole corresponds to the position of the electrode transition layer.

[0014] The utility model also provides a heating film with uniform far-infrared radiation, comprising:

[0015] A circuit pattern composed of a conductive layer and a far-infrared radiation layer;

[0016] A sealing insulating layer disposed on one side of the conductive layer;

[0017] An electrode transition layer is arranged between the conductive layer and the sealing insulating layer, and an electrode hole is arranged on the surface of the sealing insulating layer on one side of the conductive layer, and the electrode hole corresponds to the position of the electrode transition layer;

[0018] A plastic film is arranged on one side of the far-infrared radiation layer, and an adhesive layer is arranged between the far-infrared radiation layer and the plastic film.

[0019] Preferably, the conductive layer is selected from a metal conductive layer or a non-metal conductive layer.

[0020] Preferably, the metal conductive layer is selected from aluminum foil, iron-chromium-aluminum alloy foil or stainless steel foil; and the non-metal conductive layer is selected from carbon paper or graphene paper.

[0021] The thickness of the conductive layer is 1 to 1000 microns.

[0022] Preferably, the far-infrared radiation layer is selected from a graphene layer, a carbon nanotube layer, a carbon layer or a far-infrared ceramic layer;

[0023] The thickness of the far-infrared radiation layer is 5 to 100 microns.

[0024] Preferably, the circuit pattern is selected from a strip circuit pattern, and the strip is arranged in a U-shaped, square, S-shaped or spiral manner, or the strip is wound according to the shape of the heating film, or multiple circuit patterns are arranged in series or in parallel, and the width of the strip is 0.1 to 20 mm.

[0025] Preferably, the circuit pattern occupies 10% to 90% of the area of ​​the heating film.

[0026] Preferably, the sealing insulating layer is a plastic film with an adhesive layer, and the plastic film is selected from PI film, PET film, PEN film, PC film or PVC film; the adhesive layer is selected from acrylic adhesive, silicone adhesive, hot melt adhesive or thermosetting adhesive layer;

[0027] The thickness of the plastic film is 5 to 1000 microns.

[0028] Preferably, the electrode transition layer is a silver layer, a copper layer, a nickel layer, a carbon layer, or a conductive copper tape or a conductive aluminum tape;

[0029] The thickness of the electrode transition layer is 1 to 1000 microns.

[0030] Preferably, the plastic film is selected from PI film, PET film, PEN film, PC film or PVC film; the adhesive layer is selected from a hot melt adhesive layer, and the hot melt adhesive is selected from EVA or TPU.

[0031] The utility model provides a heating film with uniform far-infrared radiation, including: a circuit pattern formed by a composite of a conductive layer and a far-infrared radiation layer; a sealing insulating layer arranged on both sides of the circuit pattern; an electrode transition layer arranged between the sealing insulating layer and the conductive layer or the sealing insulating layer and the infrared radiation layer; the circuit pattern is uniformly arranged in the heating film, and the entire circuit pattern is conductive. The utility model utilizes a circuit pattern formed by a composite of a conductive layer and a far-infrared radiation layer, which can not only meet the requirements of heating impedance, uniform heating, and uniform far-infrared radiation through fine pattern design, but also the double-layer setting of the conductive layer and the far-infrared radiation layer is more reliable, not easy to break or fall off, and is easier to process, which greatly improves the applicable scenarios of the flexible heating film. Uniform heating can be achieved when the circuit pattern occupies 10% to 90% of the area of ​​the heating film. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0033] Figure 1 A schematic diagram of the structure of a heating film with uniform far-infrared radiation provided by the utility model;

[0034] Figure 2 A schematic diagram of the structure of a heating film with uniform far-infrared radiation provided by the utility model;

[0035] Figure 3 This is a schematic diagram of the structure of the high-temperature heating film prepared in Example 1;

[0036] Figure 4 This is a schematic diagram of the structure of the heating eye mask prepared in Example 2;

[0037] Figure 5 This is a process flow chart of patterning a heating film with uniform far-infrared radiation provided by the utility model. DETAILED DESCRIPTION

[0038] The following describes the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0039] The utility model provides a heating film with uniform far-infrared radiation, comprising:

[0040] A circuit pattern composed of a conductive layer and a far-infrared radiation layer;

[0041] A sealing insulating layer disposed on both sides of the circuit pattern;

[0042] An electrode transition layer disposed between the sealing insulating layer and the conductive layer or between the sealing insulating layer and the infrared radiation layer;

[0043] The circuit pattern is evenly arranged in the heating film, and the entire circuit pattern is electrically conductive.

[0044] In some specific embodiments of the present invention, the heating film with uniform far-infrared radiation includes:

[0045] A circuit pattern composed of a conductive layer and a far-infrared radiation layer;

[0046] A sealing insulating layer disposed on both sides of the circuit pattern;

[0047] An electrode transition layer is arranged between the infrared radiation layer and the sealing insulation layer, and an electrode hole is arranged on the surface of the sealing insulation layer on one side of the infrared radiation layer, and the electrode hole corresponds to the position of the electrode transition layer.

[0048] Specifically, the heating film structure provided by the present invention includes a conductive layer, and the conductive layer is selected from a metal conductive layer or a non-metal conductive layer.

[0049] Preferably, the metal conductive layer is selected from aluminum foil, iron-chromium-aluminum alloy foil or stainless steel foil; and the non-metal conductive layer is selected from carbon paper or graphene paper.

[0050] In the present invention, the thickness of the conductive layer is 1 to 1000 microns, which can be 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, or any value between 1 and 1000 microns, preferably 5 to 500 microns.

[0051] The far-infrared radiation layer is selected from a graphene layer, a carbon nanotube layer, a carbon layer or a far-infrared ceramic layer, preferably a graphene layer.

[0052] The thickness of the far-infrared radiation layer is 5 to 100 microns, and can be 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, or any value between 5 and 100 microns, preferably 10 to 30 microns.

[0053] There is no special restriction on the specific shape of the circuit pattern. In order to ensure that the heating film is a flexible heating film and is used for heating in a special-shaped heating body, it is preferably a composite circuit formed by a strip-type conductive layer and a far-infrared radiation layer, and the strips are arranged in a U-shaped, square, S-shaped or spiral manner, or the strips are wound according to the shape of the heating film, or multiple circuit patterns are arranged in series or parallel.

[0054] In the utility model, the width of the strip is 0.1 to 20 mm, which can be 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or any value between 0.1 and 20 mm, preferably 1 to 10 mm, and the strip occupies 10% to 90% of the area of ​​the heating film, which can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or any value between 30% and 90%, preferably 40% to 70%. Preferably, in order to ensure uniformity, the strip is distributed as evenly as possible in the heating film.

[0055] The heating film structure provided by the utility model also includes a sealing insulating layer arranged on both sides of the circuit pattern; in the utility model, the sealing insulating layer is selected from a plastic film, the plastic film is a plastic film with an adhesive layer, the plastic film is selected from a PI film, a PET film, a PEN film, a PC film or a PVC film; the adhesive layer is selected from an acrylic adhesive, a silicone adhesive or a thermosetting adhesive layer. The thermosetting adhesive is selected from an acrylic thermosetting adhesive or an epoxy thermosetting adhesive. In the utility model, the thickness of the plastic film on both sides of the heating film is 5 to 1000 microns, which can be 5, 10, 25, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000, or any value between 5 and 1000 microns, preferably 50 to 200 microns.

[0056] The heating film structure provided by the utility model also includes an electrode transition layer arranged between the infrared radiation layer and the sealing insulation layer, and the electrode transition layer is a conductive material, which can be silver, copper, nickel or carbon, or a conductive copper tape or a conductive aluminum tape. The thickness of the electrode transition layer is 1 to 1000 microns, which can be 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, or any value between 1 and 1000 microns, preferably 10 to 500 microns, and more preferably 30 to 200 microns.

[0057] In the utility model, the surface of the sealing insulating layer arranged on one side of the infrared radiation layer is provided with an electrode hole, the electrode hole corresponds to the position of the electrode transition layer, and the wire is connected to the electrode transition layer through the electrode hole.

[0058] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a heating film with uniform far-infrared radiation provided by the utility model. Figure 1 In the figure, 1 is a plastic film, 2 is a conductive layer, 3 is a far-infrared radiation layer, 4 is an electrode transition layer, and 5 is an electrode hole.

[0059] The operating temperature of the heating film is greater than or equal to 100°C.

[0060] The utility model also provides a heating film patterning process with uniform far-infrared radiation and a use temperature greater than or equal to 100° C., comprising the following steps:

[0061] A) laminating the conductive layer onto the low-viscosity base film, then coating the surface of the conductive layer with a far-infrared radiation material slurry, and drying to obtain a composite film of the low-viscosity base film / conductive layer / far-infrared radiation layer;

[0062] B) the composite film comprises a circuit pattern region and a region outside the circuit pattern, a thermal transfer adhesive is applied to the region outside the circuit pattern of the composite film, and then the circuit pattern is die-cut on the surface of the composite film;

[0063] C) laminating a plastic film on the surface of the composite film, then removing the plastic film and discarding the area outside the circuit pattern corresponding to the conductive layer and the far-infrared radiation layer to obtain a circuit pattern composed of the conductive layer and the far-infrared radiation layer laminated on the surface of the low-adhesion base film;

[0064] D) preparing an electrode transition layer on the circuit pattern and compounding a plastic film with electrode holes;

[0065] E) After removing the low-adhesion base film, laminating with a plastic film, cutting and connecting the output wires to obtain a heating film.

[0066] The utility model first laminates the conductive layer onto the low-adhesion base film. In the utility model, the conductive layer is selected from a metal conductive layer or a non-metal conductive layer.

[0067] Preferably, the metal conductive layer is selected from aluminum foil, iron-chromium-aluminum alloy foil or stainless steel foil; and the non-metal conductive layer is selected from carbon paper or graphene paper.

[0068] In the present invention, the thickness of the conductive layer is 1 to 1000 microns, which can be 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, or any value between 1 and 1000 microns, preferably 5 to 500 microns.

[0069] The low-adhesion base film is a plastic film with an adhesive layer, and the plastic film is selected from PI film, PET film, PEN film, PC film or PVC film; the adhesive layer is selected from acrylic adhesive or silicone adhesive.

[0070] The utility model has no special limitation on the lamination method, and preferably the metal conductive layer is laminated onto the low-viscosity base film in a roll-to-roll manner.

[0071] Then, the far-infrared radiation material slurry is coated on the surface of the conductive layer, and after drying, a composite film of low-viscosity base film / conductive layer / far-infrared radiation layer is obtained.

[0072] The far-infrared radiation material slurry is selected from graphene slurry, carbon nanotube slurry, carbon slurry or far-infrared ceramic slurry, preferably graphene slurry.

[0073] The thickness of the obtained far-infrared radiation layer is 5 to 100 microns, and can be 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, or any value between 5 and 100 microns, preferably 10 to 30 microns.

[0074] The utility model has no special restrictions on the drying process, and any drying method known to those skilled in the art can be used. In the utility model, drying in a drying tunnel is preferably used. The drying temperature is 60 to 150°C, and can be 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, or any value between 60 and 150°C. Preferably, it is 80 to 100°C.

[0075] The composite film comprises a circuit pattern area and an area outside the circuit pattern, a thermal transfer adhesive is coated on the area outside the circuit pattern of the composite film, and then the circuit pattern is die-cut on the surface of the composite film;

[0076] The heat transfer adhesive is selected from EVA or TPU. The heat transfer adhesive is preferably applied by roll-to-roll screen printing. The die-cutting is preferably performed by laser or knife die-cutting.

[0077] The utility model has no special restrictions on the specific shape of the circuit pattern. In order to ensure that the heating film is a flexible heating film and is used for heating in a special-shaped heating body, it is preferably a composite circuit formed by a strip-type conductive layer and a far-infrared radiation layer, and the strips are arranged in a U-shaped, square, S-shaped or spiral manner, or the strips are wound according to the shape of the heating film, or multiple circuit patterns are arranged in series or parallel.

[0078] In the utility model, the width of the strip is 0.1 to 20 mm, which can be 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or any value between 0.1 and 20 mm, preferably 1 to 10 mm, and the strip occupies 10% to 90% of the area of ​​the heating film, which can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or any value between 30% and 90%, preferably 40% to 70%. Preferably, in order to ensure uniformity, the strip is distributed as evenly as possible in the heating film.

[0079] Next, a plastic film is coated on the surface of the composite film. After the plastic film and the thermal transfer adhesive of the composite film are bonded, the plastic film is removed, and the area outside the circuit pattern corresponding to the conductive layer and the far-infrared radiation layer is discarded, thereby obtaining a circuit pattern formed by the conductive layer and the far-infrared radiation layer laminated on the surface of the low-viscosity base film;

[0080] When a plastic film is coated on the surface of the composite film, the plastic film is bonded to the thermal transfer adhesive in the area outside the circuit pattern. When the plastic film is removed, the area outside the circuit pattern corresponding to the conductive layer and the far-infrared radiation layer is removed together with the plastic film.

[0081] Then, an electrode transition layer is prepared on the circuit pattern. The electrode transition layer is an electrode connection point for connecting the heat conductive layer and the wire. The electrode transition layer is prepared by coating the surface of the circuit pattern with a conductive paste and / or a conductive tape. The conductive paste is selected from silver paste, copper paste, carbon paste or nickel paste; the conductive tape is selected from conductive copper tape or conductive aluminum tape. In some specific embodiments of the utility model, the electrode transition layer is arranged at both ends of the strip of the circuit pattern.

[0082] Then, a plastic film with electrode holes is compounded on one side of the electrode transition layer; the electrode holes correspond to the positions of the electrode transition layer. The plastic film is a plastic film with an adhesive layer, and the plastic film is selected from PI film, PET film, PEN film, PC film or PVC film; the adhesive layer is selected from acrylic adhesive, silicone adhesive or thermosetting adhesive layer. The thermosetting adhesive is selected from acrylic thermosetting adhesive or epoxy thermosetting adhesive.

[0083] Finally, after removing the low-viscosity base film, the plastic film is applied, cut and connected to obtain a heating film. The utility model has no special restrictions on the connection method, which can be welding or riveting. The plastic film is as described above and will not be repeated here.

[0084] In the utility model, the thickness of the plastic film on both sides of the heating film is 5 to 1000 microns, which can be 5, 10, 25, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000, or any value between 5 and 1000 microns, preferably 50 to 200 microns.

[0085] The utility model also provides a heating film with uniform far-infrared radiation, the structure of which includes:

[0086] A circuit pattern composed of a conductive layer and a far-infrared radiation layer;

[0087] A sealing insulating layer disposed on one side of the conductive layer;

[0088] An electrode transition layer is arranged between the conductive layer and the sealing insulating layer, and an electrode hole is arranged on the surface of the sealing insulating layer on one side of the conductive layer, and the electrode hole corresponds to the position of the electrode transition layer;

[0089] A plastic film is arranged on one side of the far-infrared radiation layer, and an adhesive layer is arranged between the far-infrared radiation layer and the plastic film.

[0090] Specifically, the heating film structure provided by the present invention includes a conductive layer, and the conductive layer is selected from a metal conductive layer or a non-metal conductive layer.

[0091] Preferably, the metal conductive layer is selected from aluminum foil, iron-chromium-aluminum alloy foil or stainless steel foil; and the non-metal conductive layer is selected from carbon paper or graphene paper.

[0092] In the present invention, the thickness of the conductive layer is 1 to 1000 microns, which can be 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, or any value between 1 and 1000 microns, preferably 5 to 500 microns.

[0093] The far-infrared radiation layer is selected from a graphene layer, a carbon nanotube layer, a carbon layer or a far-infrared ceramic layer, and is preferably a graphene layer.

[0094] The thickness of the far-infrared radiation layer is 5 to 100 microns, and can be 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, or any value between 5 and 100 microns, preferably 10 to 30 microns.

[0095] There is no special restriction on the specific shape of the circuit pattern. In order to ensure that the heating film is a flexible heating film and is used for heating in a special-shaped heating body, it is preferably a composite circuit formed by a strip-type conductive layer and a far-infrared radiation layer, and the strips are arranged in a U-shaped, square, S-shaped or spiral manner, or the strips are wound according to the shape of the heating film, or multiple circuit patterns are arranged in series or parallel.

[0096] In the utility model, the width of the strip is 0.1 to 20 mm, which can be 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or any value between 0.1 and 20 mm, and the strip occupies 10% to 90% of the area of ​​the heating film, which can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or any value between 30% and 90%, preferably 40% to 70%. Preferably, in order to ensure uniformity, the strip is distributed as evenly as possible in the heating film.

[0097] The heating film structure provided by the utility model also includes a sealing insulating layer arranged on one side of the conductive layer. In the utility model, the sealing insulating layer is selected from a plastic film, the plastic film is a plastic film with an adhesive layer, the plastic film is selected from a PI film, a PET film, a PEN film, a PC film or a PVC film; the adhesive layer is selected from an acrylic adhesive, a silicone adhesive or a thermosetting adhesive layer. The hot melt adhesive is selected from EVA or TPU. In the utility model, the thickness of the plastic film on both sides of the heating film is 5 to 1000 microns, which can be 5, 10, 25, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000, or any value between 5 and 1000 microns, preferably 50 to 200 microns.

[0098] The heating film structure provided by the utility model also includes an electrode transition layer arranged between the conductive layer and the sealing insulating layer, and the electrode transition layer is a conductive material, which can be silver, copper, nickel or carbon, or a conductive copper tape or a conductive aluminum tape. The thickness of the electrode transition layer is 1 to 1000 microns, which can be 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, or any value between 1 and 1000 microns, preferably 10 to 500 microns, and more preferably 30 to 200 microns.

[0099] In the utility model, the surface of the sealing insulating layer arranged on one side of the conductive layer is provided with an electrode hole, the electrode hole corresponds to the position of the electrode transition layer, and the wire is connected to the electrode transition layer through the electrode hole.

[0100] The heating film structure provided by the utility model further comprises a plastic film arranged on one side of the far-infrared radiation layer, and an adhesive layer is arranged between the far-infrared radiation layer and the plastic film. The plastic film is selected from PI film, PET film, PEN film, PC film or PVC film; the adhesive layer is preferably a hot melt adhesive layer, and the hot melt adhesive is selected from EVA or TPU.

[0101] See also Figure 2 , Figure 2 This is a schematic diagram of the structure of a heating film with uniform far-infrared radiation provided by the utility model. Figure 2 In the figure, 1 is a plastic film, 2 is a conductive layer, 3 is a far-infrared radiation layer, 4 is an electrode transition layer, 5 is an electrode hole, 6 is an adhesive layer, and 7 is a hot-melt adhesive film.

[0102] The operating temperature of the heating film is less than 100°C.

[0103] The utility model also provides a heating film patterning process with uniform far-infrared radiation and a use temperature of less than 100° C., comprising the following steps:

[0104] a) laminating the conductive layer onto the low-viscosity base film, then coating the surface of the conductive layer with a far-infrared radiation material slurry, and drying to obtain a composite film of the low-viscosity base film / conductive layer / far-infrared radiation layer;

[0105] b) the composite film includes a circuit pattern area and an area outside the circuit pattern, a thermal transfer adhesive is applied to the circuit pattern area of ​​the composite film, and then the circuit pattern is die-cut;

[0106] c) laminating a plastic film on the surface of the composite film, removing the low-adhesion base film, and discarding the area outside the circuit pattern corresponding to the conductive layer and the far-infrared radiation layer to obtain a circuit pattern composed of the conductive layer and the far-infrared radiation layer laminated on the surface of the plastic film;

[0107] d) preparing an electrode transition layer on the circuit pattern, and compounding a plastic film with electrode holes, cutting and connecting the leads to obtain a heating film.

[0108] The utility model first laminates the conductive layer onto the low-adhesion base film. In the utility model, the conductive layer is selected from a metal conductive layer or a non-metal conductive layer.

[0109] Preferably, the metal conductive layer is selected from aluminum foil, iron-chromium-aluminum alloy foil or stainless steel foil; and the non-metal conductive layer is selected from carbon paper or graphene paper.

[0110] In the present invention, the thickness of the conductive layer is 1 to 1000 microns, which can be 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, or any value between 1 and 1000 microns, preferably 5 to 500 microns.

[0111] The low-adhesion base film is a plastic film with an adhesive layer, and the plastic film is selected from PI film, PET film, PEN film, PC film or PVC film; the adhesive layer is selected from acrylic adhesive or silicone adhesive.

[0112] The utility model has no special limitation on the lamination method, and preferably the metal conductive layer is laminated onto the low-viscosity base film in a roll-to-roll manner.

[0113] Then, the far-infrared radiation material slurry is coated on the surface of the conductive layer, and after drying, a composite film of low-viscosity base film / conductive layer / far-infrared radiation layer is obtained.

[0114] The far-infrared radiation material slurry is selected from graphene slurry, carbon nanotube slurry, carbon slurry or far-infrared ceramic slurry, preferably graphene slurry.

[0115] The thickness of the obtained far-infrared radiation layer is 5 to 100 microns, and can be 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, or any value between 5 and 100 microns, preferably 10 to 30 microns.

[0116] The utility model has no special restrictions on the drying process, and any drying method known to those skilled in the art can be used. In the utility model, drying in a drying tunnel is preferably used. The drying temperature is 60 to 150°C, and can be 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, or any value between 60 and 150°C. Preferably, it is 80 to 100°C.

[0117] The composite film includes a circuit pattern area and an area outside the circuit pattern, a thermal transfer adhesive is coated on the surface of the far-infrared radiation layer in the circuit pattern area of ​​the composite film, and then the circuit pattern is die-cut;

[0118] The heat transfer adhesive is selected from EVA or TPU. The heat transfer adhesive is preferably applied by roll-to-roll screen printing. The die-cutting is preferably performed by laser or knife die-cutting.

[0119] The utility model has no special restrictions on the specific shape of the circuit pattern. In order to ensure that the heating film is a flexible heating film and is used for heating in a special-shaped heating body, it is preferably a composite circuit formed by a strip-type conductive layer and a far-infrared radiation layer, and the strips are arranged in a U-shaped, square, S-shaped or spiral manner, or the strips are wound according to the shape of the heating film, or multiple circuit patterns are arranged in series or parallel.

[0120] In the utility model, the width of the strip is 0.1 to 20 mm, which can be 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or any value between 0.1 and 20 mm, and the strip occupies 10% to 90% of the area of ​​the heating film, which can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or any value between 30% and 90%, preferably 40% to 70%. Preferably, in order to ensure uniformity, the strip is distributed as evenly as possible in the heating film.

[0121] Next, a plastic film is laminated on the surface of the composite film, the low-adhesion base film is removed, and the area outside the circuit pattern corresponding to the conductive layer and the far-infrared radiation layer is discarded to obtain a circuit pattern laminated on the surface of the plastic film and composed of the conductive layer and the far-infrared radiation layer;

[0122] The plastic film is selected from PI film, PET film, PEN film, PC film or PVC film. The plastic film is bonded to the circuit pattern through the thermal transfer adhesive on the surface of the far-infrared radiation layer.

[0123] When the low-adhesion base film is removed, the areas outside the circuit patterns corresponding to the conductive layer and the far-infrared radiation layer are also removed.

[0124] An electrode transition layer is prepared on the circuit pattern, and a plastic film with electrode holes is compounded, and the output wires are connected after cutting to obtain a heating film.

[0125] An electrode transition layer is prepared on the circuit pattern. The electrode transition layer is an electrode connection point for connecting the heat conductive layer and the wire. The electrode transition layer is prepared by coating a conductive paste and / or conductive tape on the surface of the circuit pattern. The conductive paste is selected from silver paste, copper paste, carbon paste or nickel paste; the conductive tape is selected from conductive copper tape or conductive aluminum tape. In some specific embodiments of the utility model, the electrode transition layer is arranged at both ends of the strip of the circuit pattern.

[0126] Then, a plastic film with electrode holes is compounded on one side of the electrode transition layer; the electrode holes correspond to the positions of the electrode transition layer. The plastic film is as described above and will not be described in detail here. The plastic film is a plastic film with an adhesive layer, and the plastic film is selected from PI film, PET film, PEN film, PC film or PVC film; the adhesive layer is selected from acrylic adhesive, silicone adhesive, and hot melt adhesive. The hot melt adhesive is selected from EVA or TPU. The adhesive layer is preferably a hot melt adhesive layer.

[0127] In the utility model, the thickness of the plastic film on both sides of the heating film is 5 to 1000 microns, which can be 5, 10, 25, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000, or any value between 5 and 1000 microns, preferably 50 to 200 microns.

[0128] Finally, the obtained composite film is cut and connected with wires to obtain a heating film. The utility model has no special restrictions on the connection method, which can be welding or riveting.

[0129] The utility model utilizes a far-infrared heating coating applied on a conductive metal or non-metal, and through die-cutting patterning means, it can have a suitable resistance and be evenly distributed inside a double-layer plastic film so that it can be evenly heated. The conductive metal or non-metal plays the role of conducting the circuit and generating heat, and the far-infrared radiation slurry such as graphene coated on the upper surface is used to radiate far-infrared rays, enhance the thermal radiation capacity of the product, and enhance the thermal radiation capacity of the product. In addition, encapsulating the heating layer in a plastic film can protect the heating layer from being scratched or oxidized.

[0130] After the utility model determines the heating resistance, the ratio of the width to the length of the heating strip can be obtained by the ratio with the square resistance of the material, and then the corresponding width and gap of the heating strip are designed according to the shape pattern of the material.

[0131] The processing technology of the heating film provided by the utility model can correspond to heating films with different operating temperatures. The metal heating film without far-infrared radiation can also have the ability to pattern special-shaped parts under this process. The heating film heats evenly and can adapt to the requirements of various special-shaped parts.

[0132] In order to further understand the present invention, the heating film with uniform far-infrared radiation provided by the present invention is described below in conjunction with embodiments, and the protection scope of the present invention is not limited by the following embodiments.

[0133] Example 1

[0134] 1. Preparation process

[0135] (1) Roll-to-roll lamination of 10 μm thick aluminum foil onto 5g viscous PET film;

[0136] (2) coating the graphene slurry on the aluminum foil and, after drying, forming a graphene film with a thickness of 12 μm;

[0137] (3) Printing white thermal transfer paste on the part of the aluminum foil that does not require a circuit pattern using a screen printer;

[0138] (4) Using laser die-cutting to form the required heating circuit pattern, so that the printing area and the non-printing area of ​​the thermal transfer adhesive are separated;

[0139] (5) Screen printing silver paste on the electrode and attaching conductive copper tape as an electrode transition layer;

[0140] (6) Roll-to-roll thermal lamination of the aluminum foil printed with thermal transfer printing onto a 50 μm thick PET plastic film at 100°C;

[0141] (7) tearing off the PET plastic film and taking away the waste, leaving the electrode pattern on the PET silicone low-viscosity film;

[0142] (8) hot pressing the aluminum foil electrode pattern on one side at 120 degrees to a PI acrylic thermosetting adhesive film with electrode holes punched therein;

[0143] (9) After removing the PET silicone low-viscosity film, a 100 μm PI acrylic thermosetting film is applied to the other side;

[0144] (10) Cut out the shape;

[0145] (11) Riveting wire.

[0146] 2. Heating membrane structure

[0147] See also Figure 3 , Figure 3 This is a schematic diagram of the structure of the high-temperature heating film prepared in Example 1. Figure 3 In the figure, 1 is PI thermosetting adhesive, 2 is aluminum foil, 3 is graphene far-infrared radiation layer, 4 is conductive silver paste + conductive copper tape, and 5 is electrode hole.

[0148] The pattern of the heating circuit is formed by winding 3mm wide electrode strips in an S shape, the spacing between adjacent electrode strips is 3mm, the resistance of the electrode strips is 4.23 ohms, the electrode strips occupy 55% of the area of ​​the heating film, and the final stable temperature of the heating film is 150 degrees Celsius. The temperature is measured on the curved part and straight line of the inner and outer lines, and the temperature is stable at about 150 degrees Celsius, and the temperature difference in the heating area does not exceed 5 degrees Celsius.

[0149] Example 2

[0150] 1. Preparation process

[0151] (1) Roll-to-roll lamination of graphene paper with a square resistance of 20 ohms and a thickness of 23 microns onto a PET acrylic 5g low-viscosity adhesive film;

[0152] (2) coating graphene slurry on the graphene paper, and after drying, forming a graphene far-infrared radiation layer with a thickness of 10 μm;

[0153] (3) Roll-to-roll screen printing thermal transfer slurry (hot melt adhesive) on the surface of the graphene far-infrared radiation layer where the electrode pattern is required;

[0154] (4) using a die cutter to cut out the desired heated filament pattern;

[0155] (5) Roll-to-roll thermal lamination of the conductive material printed with thermal transfer onto the PET plastic film;

[0156] (6) Tear off the plastic film to leave the desired circuit pattern, while the low-viscosity film takes away the waste (i.e., the part outside the circuit pattern);

[0157] (7) Screen printing silver paste at both ends of the strip of electrode pattern as an electrode transition layer;

[0158] (8) a 125 μm PET plastic hot melt adhesive film with electrode holes punched on one side by heat pressing, wherein the electrode holes correspond to the positions of the electrode transition layer;

[0159] (9) Cut out the shape;

[0160] (10) Welding wires.

[0161] 2. Heating membrane structure

[0162] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of the heating eye mask prepared in Example 2. Figure 4 In the figure, 1 is a PET hot melt adhesive film, 2 is a graphene paper, 3 is a graphene far-infrared radiation layer, 4 is a conductive silver paste, and 5 is an electrode hole.

[0163] The outer dimensions of the eye mask are 165*62mm, the width of the electrode strip of the heating circuit is 4.4mm, the spacing between adjacent electrode strips is 3.6mm, the heating area accounts for 50% of the total area, and the total resistance is 7 ohms. The temperature is measured on the curved part and straight line of the inner and outer lines, and the final stable temperature is 60 degrees Celsius, and the temperature difference in the heating area does not exceed 2 degrees Celsius.

[0164] Comparative Example

[0165] The graphene heating eye mask produced by Lehuatu Intelligent Clothing Graphene purchased from Taobao was suspended in the air and driven by 5V. The temperature inside the arc was 48 degrees Celsius, and the temperature outside was 37 degrees Celsius, with a temperature difference of 11°C in the heating area.

[0166] Existing carbon graphene heating films basically use silver paste electrodes or copper electrodes as conductive electrodes, and graphene or carbon nanotubes and other materials as heating areas. This technology can generate heat evenly in rectangular heating areas, but for special-shaped parts, it can only be done by stacking rectangles or using arc electrodes. However, arc electrodes cannot generate heat evenly, and the outer edge of the arc is colder than the inner edge, and the temperature difference can even reach 11°C.

Claims

1. A heating film with uniform far-infrared radiation, characterized in that: include: A circuit pattern composed of a conductive layer and a far-infrared radiation layer; A sealing insulating layer disposed on both sides of the circuit pattern; An electrode transition layer disposed between the sealing insulating layer and the conductive layer or between the sealing insulating layer and the infrared radiation layer; The circuit pattern is evenly arranged in the heating film, and the entire circuit pattern is electrically conductive.

2. A heating film with uniform far-infrared radiation, characterized in that: include: A circuit pattern composed of a conductive layer and a far-infrared radiation layer; A sealing insulating layer disposed on both sides of the circuit pattern; An electrode transition layer is arranged between the infrared radiation layer and the sealing insulation layer, and an electrode hole is arranged on the surface of the sealing insulation layer on one side of the infrared radiation layer, and the electrode hole corresponds to the position of the electrode transition layer.

3. A heating film with uniform far-infrared radiation, characterized in that: include: A circuit pattern composed of a conductive layer and a far-infrared radiation layer; A sealing insulating layer disposed on one side of the conductive layer; An electrode transition layer is arranged between the conductive layer and the sealing insulating layer, and an electrode hole is arranged on the surface of the sealing insulating layer on one side of the conductive layer, and the electrode hole corresponds to the position of the electrode transition layer; A plastic film is arranged on one side of the far-infrared radiation layer, and an adhesive layer is arranged between the far-infrared radiation layer and the plastic film.

4. The heating film according to any one of claims 1 to 3, characterized in that: The conductive layer is selected from a metal conductive layer or a non-metal conductive layer; The thickness of the conductive layer is 1 to 1000 microns.

5. The heating film according to any one of claims 1 to 3, characterized in that: The far-infrared radiation layer is selected from a graphene layer, a carbon nanotube layer, a carbon layer or a far-infrared ceramic layer; The thickness of the far-infrared radiation layer is 5 to 100 microns.

6. The heating film according to any one of claims 1 to 3, characterized in that: The circuit pattern is selected from a strip circuit pattern, and the strip is arranged in a U-shaped, square, S-shaped or spiral manner, or the strip is wound according to the shape of the heating film, or multiple circuit patterns are arranged in series or in parallel, and the width of the strip is 0.1 to 20 mm.

7. The heating film according to any one of claims 1 to 3, characterized in that: The circuit pattern occupies 10% to 90% of the area of ​​the heating film.

8. The heating film according to any one of claims 1 to 3, characterized in that: The sealing insulating layer is selected from a plastic film, the plastic film is a plastic film with an adhesive layer, the plastic film is selected from a PI film, a PET film, a PEN film, a PC film or a PVC film; the adhesive layer is selected from an acrylic adhesive, a silicone adhesive, a hot melt adhesive or a thermosetting adhesive layer; The thickness of the plastic film is 5 to 1000 microns.

9. The heating film according to any one of claims 1 to 3, characterized in that: The electrode transition layer is a silver layer, a copper layer, a nickel layer, a carbon layer, or a conductive copper tape or a conductive aluminum tape; The thickness of the electrode transition layer is 1 to 1000 microns.

10. The heating film according to claim 3, characterized in that: The plastic film is selected from PI film, PET film, PEN film, PC film or PVC film; the adhesive layer is selected from hot melt adhesive layer, and the hot melt adhesive is selected from EVA or TPU.

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