A RFID washable electronic tag

Abstract

An embodiment of the present invention discloses an RFID water-washing electronic tag, which relates to the technical field of linen washing monitoring. The RFID water-washing electronic tag comprises: a substrate layer, a reinforcement layer, a printed antenna, a first adhesive layer and a protective layer; wherein the reinforcement layer is arranged on the surface of the substrate layer; the printed antenna is formed on the surface of the reinforcement layer, and the size of the printed antenna is smaller than the size of the reinforcement layer; the protective layer is combined with the reinforcement layer through the first adhesive layer, and covers the printed antenna. The present invention improves the bonding stability between the substrate layer and the protective layer by arranging a reinforcement layer on the surface of the substrate layer that can enhance its adhesion, thereby enhancing the structural stability of the RFID water-washing electronic tag and ensuring its washing resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of linen washing monitoring, and in particular relates to an RFID water washing electronic tag. Background Art

[0002] RFID radio frequency identification is a non-contact automatic identification technology. It automatically identifies the target object and obtains relevant data through radio frequency signals. The identification work does not require human intervention and can work in various harsh environments. Nowadays, RFID technology has achieved the ability to identify high-speed moving objects and multiple tags at the same time, which has greatly broadened the application of RFID electronic tags in various industries. RFID water-washing electronic tags (also known as water-washing labels) are the application products of RFID technology in the field of linen washing. Its function is to monitor and manage the entire life cycle of hotel linens, thereby improving the safety of hotel linens. Therefore, an important indicator for RFID water-washing electronic tags is that they can withstand industrial washing, and they need to be able to work normally after industrial washing.

[0003] At present, most of the vast majority of RFID water-washable electronic tags on the market cannot withstand the current industrial washing equipment (such as washing dragons). This is mainly because the current industrial washing equipment not only produces a high-temperature and high-pressure washing environment, as well as a large torque rotation, which causes the RFID water-washable electronic tags to produce unexpected distortion during the washing process, but also exerts great mechanical pressure on the RFID water-washable electronic tags during the washing process. Especially when the RFID water-washable electronic tags are subjected to the mechanical pressure when they are twisted and deformed, the RFID water-washable electronic tags will bend, thereby producing irreversible creases, causing the tag antenna at the crease to break or crack, thereby directly affecting or even destroying the performance of the RFID water-washable electronic tags. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an RFID water-washable electronic tag to solve the problem that the RFID water-washable electronic tag in the prior art is easily damaged during the washing process.

[0005] In some illustrative embodiments, the RFID water-washable electronic tag includes: a substrate layer, a reinforcement layer, a printed antenna, a first adhesive layer and a protective layer; wherein the reinforcement layer is arranged on the surface of the substrate layer; the printed antenna is formed on the surface of the reinforcement layer, and the size of the printed antenna is smaller than the size of the reinforcement layer; the protective layer is combined with the reinforcement layer through the first adhesive layer and covers the printed antenna.

[0006] In some optional embodiments, the reinforcement layer is a first reinforcement layer; a second reinforcement layer is provided on a side of the protective layer facing the printed antenna, and the first reinforcement layer on the substrate layer is combined with the second reinforcement layer of the protective layer through the first adhesive layer.

[0007] In some optional embodiments, the substrate layer and / or the protective layer are made of flexible non-stretchable material.

[0008] In some optional embodiments, the reinforcement layer is a polydopamine film layer.

[0009] In some optional embodiments, along the direction away from the printed antenna, the protective layer includes in sequence: a bending protective layer, a compression protective layer and a fabric layer; the compression protective layer is combined with the bending protective layer through the second adhesive layer; and the fabric layer is arranged on the outside of the compression protective layer.

[0010] In some optional embodiments, the RFID washable electronic tag further includes: a tag chip disposed between the bending protection layer and the pressure-resistant protection layer.

[0011] In some optional embodiments, the pressure-resistant protective layer is made of a flexible and stretchable material.

[0012] In some optional embodiments, the pressure-resistant protective layer is made of silicone.

[0013] In some optional embodiments, the fabric layer has a plain weave surface and a twill weave surface; and the silica gel is combined with the fabric layer by being impregnated into the twill weave surface of the fabric layer.

[0014] In some optional embodiments, the printed antenna is a conductive paste formed by mixing liquid metal and conductive silver paste.

[0015] Compared with the prior art, this application has the following advantages:

[0016] The present invention improves the bonding stability between the base layer and the protective layer by arranging a reinforcement layer on the surface of the base layer to improve its adhesion, thereby improving the structural stability of the RFID water-washable electronic tag and ensuring its washing resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural example 1 of the RFID water-washable electronic tag in an embodiment of the present invention;

[0018] Figure 2 This is the second structural example of the RFID water-washable electronic tag in the embodiment of the present invention;

[0019] Figure 3This is the third structural example of the RFID water-washable electronic tag in the embodiment of the present invention;

[0020] Figure 4 This is the fourth structural example of the RFID washable electronic tag in the embodiment of the present invention;

[0021] Figure 5 This is the fifth structural example of the RFID washable electronic tag in the embodiment of the present invention;

[0022] Figure 6 This is the sixth structural example of the RFID washable electronic tag in the embodiment of the present invention;

[0023] Figure 7 This is the seventh structural example of the RFID washable electronic tag in the embodiment of the present invention;

[0024] Figure 8 This is a first structural example of the anti-bending flexible electronics in an embodiment of the present invention;

[0025] Fig. 9 is a side cross-sectional view of the anti-bending flexible electronics in an embodiment of the present invention;

[0026] Fig.10 This is the second structural example of the anti-bending flexible electronics in the embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following description and the accompanying drawings fully illustrate specific embodiments of the present invention so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The examples represent possible variations only. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of the present invention includes the entire scope of the claims, and all available equivalents of the claims. In this article, these embodiments of the present invention may be represented individually or collectively by the term "invention", which is merely for convenience, and if more than one invention is disclosed in fact, it is not intended to automatically limit the scope of the application to any single invention or inventive concept.

[0028] It should be noted that the various technical features in the embodiments of the present invention can be combined with each other without conflict.

[0029] The embodiment of the present invention discloses an RFID washing electronic tag (also referred to as a washing electronic tag, a washing label, or an RFID washing label), such as Figure 1 As shown, Figure 1The schematic diagram of the structure of the washable electronic tag in the embodiment of the present invention. The washable electronic tag comprises: a flexible non-stretchable bending protection layer 1 and an antenna layer 2; wherein the bending protection layer 1 comprises a first bending protection layer 11 and a second bending protection layer 12, which are respectively located on both sides of the antenna layer 2, and the antenna layer 2 is covered therein. The antenna layer 2 comprises a flexible non-stretchable base layer 21 and a printed antenna 22 attached to the base layer 21; wherein the minimum curvature radius of the first bending protection layer 11 and the second bending protection layer 12 is greater than the minimum curvature radius of the base layer 21.

[0030] The minimum radius of curvature in this embodiment refers to the radius of curvature of the outer arc surface of the substrate when it is in a folded state. For a substrate without elastic deformation, it can generally be considered that the thickness of the substrate is approximately equal to its minimum radius of curvature, that is, the thickness of the first bending protection layer 11 and the second bending protection layer 12 is greater than the thickness of the base layer 21.

[0031] Since the base layer 21 is located between the first bending protective layer 11 and the second bending protective layer 12, when the label is bent as a whole, the base layer 21 attached to the first bending protective layer 11 and the second bending protective layer 12 will maintain a circular arc greater than the circular arc surface when the first bending protective layer 11 / the second bending protective layer 12 are folded in half. Therefore, due to the limitation of the first bending protective layer 11 / the second bending protective layer 12, it is difficult for the base layer 21 itself to reach a dead fold state, and therefore, the probability of creases on the base layer 21 can be effectively reduced, and the probability of breakage / cracks in the printed antenna 22 attached to the base layer 21 can be reduced, thereby improving the washing resistance of the washable electronic tag.

[0032] The present invention provides flexible and non-stretchable bending protection layers on both sides of a flexible and non-stretchable antenna layer, and utilizes a bending protection layer with a curvature radius greater than that of the antenna layer to reduce the bending strength and bending stress borne by the antenna layer when subjected to external pressure, so that the antenna layer is not prone to creases, thereby reducing the risk of breakage or cracks at the creases. On the other hand, the bending protection layer and the base layer are made of flexible and non-stretchable materials, so that both are not prone to expansion and contraction deformation during compression, and the curvature radius is almost unaffected during washing, thereby ensuring the protective effect of the bending protection layer on the antenna layer and ensuring the industrial washing resistance of the water-washable electronic tag in the present application.

[0033] Furthermore, the thickness of the first bending protection layer 11 and the second bending protection layer 12 in the embodiment of the present invention is 2-5 times the thickness of the base layer 21. Specifically, the thickness of the base layer 21 may range from 20 μm to 100 μm; the thickness of the first bending protection layer 11 and / or the second bending protection layer 12 may range from 100 μm to 300 μm.

[0034] In some embodiments, one or more of the first bending protection layer 11, the second bending protection layer 12 and the base layer 21 in the embodiments of the present invention may be made of a flexible non-stretchable material such as a PI film, a PET film, and other flexible non-stretchable materials in the prior art. The first bending protection layer 11, the second bending protection layer 12 and the base layer 21 in the embodiments of the present invention are all made of insulating materials.

[0035] In some embodiments, the first bending protective layer 11 and the second bending protective layer 12 in the embodiments of the present invention can be a split structure or an integrated structure. In the integrated structure, the antenna layer 2 can be covered by folding and packaging. The thickness of the first bending protective layer 11 and the second bending protective layer 12 in the split structure can be selected within the above-mentioned thickness range, and their thicknesses can be inconsistent.

[0036] Specifically, the first bending protection layer 11 and the antenna layer 2 in the embodiment of the present invention can be combined through the first adhesive layer 31, and the second bending protection layer 12 and the antenna layer 2 can also be combined through the second adhesive layer 32. In addition to the adhesive layer, the two can also be combined by sewing. Preferably, the first bending protection layer 11 and the second bending protection layer 12 in the embodiment of the present invention are combined with the antenna layer 2 respectively through the first adhesive layer 31 and the second adhesive layer 32. Compared with sewing, the adhesive bonding has a simple process, is not easy to damage the substrate, and the thickness effect is much lower than sewing.

[0037] The adhesive layer in this embodiment can be made of liquid / solid adhesive, the liquid adhesive can be, for example, a two-component hot-pressed adhesive, and the solid adhesive can be, for example, a hot-melt adhesive film, specifically, TPE, TPU, TPV, etc., which have such properties and functions.

[0038] In some embodiments, the base layer 21 can be but is not limited to a single-layer structure. In the case of a single-layer structure, the antenna layer 2 is a double-layer structure, namely, the base layer 21 and the printed antenna 22 attached thereto; the antenna layer 2 of this structure is combined with the first bending protection layer 11 and the second bending protection layer 12 through the first adhesive layer 31 and the second adhesive layer 32, that is, the label structure is, from top to bottom, the first bending protection layer 11, the first adhesive layer 31, the printed antenna 22, the base layer 21, the second adhesive layer 32, and the second bending protection layer 12.

[0039] like Figure 2As shown, the base layer 21 can also be a multi-layer structure that encapsulates the printed antenna 22. For example, the base layer 21 is the first base layer 21, and also includes the second base layer 23. The first base layer 21 and the second base layer 23 cooperate to clamp the printed antenna 22 inside. The first base layer 21 and the second base layer 23 are combined by the third adhesive layer 33, thereby forming a 4-layer antenna layer 2; the formation can be achieved by first printing the printed antenna 22 on the surface of the first base layer 21, and then combining the first base layer 21 and the second base layer 23 by the third adhesive layer 33. Among them, the first base layer 21 and the second base layer 23 can be combined in a split manner, or in an integrated manner to form a coating for the printed antenna 22 after bending. After the antenna layer 2 is combined with the first bending protective layer 11 and the second bending protective layer 12, the first bending protective layer 11, the first adhesive layer 31, the second base layer 23, the third adhesive layer 33, the printed antenna 22, the first base layer 21, the second adhesive layer 32, and the second bending protective layer 12 can be obtained from top to bottom.

[0040] In the case where the base layer in the above embodiment is a double-layer structure, the first base layer 21 and the second base layer 23 can form protection for the printed antenna 22, so the first bending protection layer 11 and the second bending protection layer 12 can also be made of flexible and non-stretchable fabric materials, such as artificial fibers or synthetic fibers, such as nylon fibers. Such fabrics are flexible and not easy to stretch, and have good resilience after bending, and are not easy to form creases on them, so the influence of the stress at the creases on the first bending protection layer 11 and / or the second bending protection layer 12 on the antenna layer 2 can be reduced. In this embodiment, the first bending protection layer 11 and / or the second bending protection layer 12 are both made of the above fabric material, or only one of them can be made of the above fabric material, and the other can be made of PI film, PET film and other materials, and a certain effect can still be achieved.

[0041] Among them, the base layer 21 in the present application adopts a single-layer structure, that is, the label structure of the first bending protection layer 11, the first adhesive layer 31, the printed antenna 22, the base layer 21, the second adhesive layer 32, and the second bending protection layer 12 from top to bottom. Among them, the second bending protection layer 12 combined with the base layer 21 through the second adhesive layer 32 can be made of fabric material. Since the first bending protection layer 11 and the base layer 21 protect the printed antenna, there is no waterproof performance requirement for the second bending protection layer 12. Therefore, the second bending protection layer 12 can be made of fabric material, which can reduce the probability of creases in the bending protection layer to a certain extent. At the same time, there is no need to use a double-layer structure for the base layer 21 in the antenna layer 2, which can reduce the overall thickness of the washing label and reduce at least one label production process, thereby improving the label production efficiency and reducing the label production cost.

[0042] like Figure 3As shown, further, the washing electronic tag in the embodiment of the present invention may also include an outer protective layer located at the first bending protective layer 11 and the second bending protective layer 12, such as a first fabric layer 41 and a second fabric layer 42; wherein the first fabric layer 41 and the first bending protective layer 11 may be combined through a fourth adhesive layer 34; and the second fabric layer 42 and the second bending protective layer 12 may be combined through a fifth adhesive layer 35. By arranging the fabric layer outside the tag body, the consistency between the washing electronic tag and the linen to be installed can be improved, thereby improving the user's comfort experience.

[0043] The above-mentioned washable electronic tag in the embodiment of the present invention can be used as a chipless tag, and the corresponding printed antenna adopts the chipless tag antenna specifications. The specific graphic size, etc. are not limited in this application.

[0044] In other embodiments, the washable electronic tag in the embodiment of the present invention may also include: a tag chip 5; the tag chip 5 may be directly contacted and connected with the printed antenna 22 in the antenna layer 2, or a tag chip that interacts with the printed antenna 22 through coupling mutual inductance may be used. The tag chip 5 does not need to be directly connected to the printed antenna 22, but only needs to be set at a designated position of the printed antenna, such as the center position, wherein the specific position of the coupled tag chip 5 is prior art, and this application does not elaborate on it. By selecting the tag chip 5, it can be set on the outer side of the first bending protection layer 11 / the second bending protection layer 12, which can avoid the influence of setting it inside the bending protection layer on the bending resistance and structural stability of the printed antenna. The tag chip 5 can be fixed on the bending protection layer by various methods such as dispensing glue.

[0045] Preferably, the tag chip 5 can be arranged between the bending protection layer and the fabric layer, and the tag chip 5 can be limited and fixed by the structure formed by the adhesive layer between the bending protection layer and the fabric layer.

[0046] Combination Figure 4-5 In some embodiments, a flexible and stretchable first anti-compression protection layer 61 and a second anti-compression protection layer (not shown) may be provided between the bending protection layer and the fabric layer, and the tag chip 5 may be provided between the first bending protection layer 11 and the first anti-compression protection layer 61; this structure may enable the tag chip 5 to have a certain amount of deformation displacement in the vertical direction, thereby offsetting / reducing the pressure on the tag chip during industrial washing of the water-washable electronic tag, and avoiding damage to the tag chip. The anti-compression protection layer may be a fluid structure or a sheet structure, and its material may be silicone, rubber, silicone rubber, polyurethane, epoxy resin, etc.

[0047] Preferably, the compression protection layer in the embodiment of the present invention can be made of vulcanized silicone or a silicone film or thermoplastic polyurethane for heat-pressing bonding, which can directly replace the adhesive layer between the bending protection layer and the fabric layer or cooperate with the adhesive layer to construct a stable layer structure.

[0048] The conductive paste for printing the printed antenna 22 in the embodiment of the present invention may include: a polymer carrier, high melting point metal particles and a low melting point metal in a liquid state at room temperature. The polymer carrier may include a resin (water-washable / oily), a thickener, a diluent, and other functional additives; the high melting point metal particles may include but are not limited to silver powder, copper powder, silver-coated copper powder, and aluminum powder; the low melting point metal may include but are not limited to gallium-based alloys such as single gallium, gallium-indium alloy, gallium-indium-tin alloy, and gallium-indium-tin-zinc alloy.

[0049] In other embodiments, the conductive paste may also be conventional conductive silver paste, conductive aluminum paste, conductive copper paste, liquid metal, etc.; preferably, the conductive paste in the present application is a liquid metal mixed conductive paste directly formed by mixing liquid metal with conductive silver paste (aluminum paste). By mixing such low melting point metal into the silver paste, on the one hand, the flexibility of the printed antenna can be enhanced, and on the other hand, the printed antenna based on the liquid metal with fluidity can also play a self-recovery role even if it is broken due to bending, thereby ensuring the stability and reliability of the printed antenna. Preferably, the conductive silver paste can be selected from the silk-screen silver paste on the market.

[0050] The weight ratio of the liquid metal to the conductive silver paste in the embodiment of the present invention may be 1:30-30:1. For example, the weight ratio of the liquid metal to the conductive silver paste may be 1:30, 1:25, 1:20, 1:15, 1:10, 1:5, 1:3, 1:2, 2:3, 4:5, 1:1, 4:4, 3:2, 2:1, 3:1, 5:1, 10:1, 15:1, 20:1, 25:1, 25:1 or 30:1.

[0051] Preferably, the weight ratio of liquid metal to conductive silver paste is selected to be 1:20 to 1:2; if the proportion of liquid metal in the entire conductive paste exceeds the above range, the liquid metal content per unit area is relatively large. When the water-washed electronic tag is subjected to great pressure, the flowable liquid metal will not only migrate to the printed antenna circuit, but may also break through the bondage of the adhesive layer between the base layer 21 and the bending protection layer, thereby migrating outward from the original position of the printed antenna, causing the structural stability of the printed antenna to decrease, affecting the conductive performance of the printed antenna, and even causing local short circuit / fracture of the printed antenna. If the proportion of liquid metal in the entire conductive paste is lower than the above range, the liquid metal content per unit area is relatively small, and its fluidity becomes poor. When the water-washed electronic tag is bent to break the printed antenna, the liquid metal at the break will migrate to the surrounding circuits, but it is easily bound by the frame of the solidified silver paste in the surrounding circuits. After the bending is restored, it cannot be well recovered from the migration point, affecting the self-repair effect of the liquid metal. When within the above range, the problem of liquid metal migration under pressure is improved. Even if the printed antenna is broken, it can be pulled back to its original position by the solidified silver paste at the bend, and the self-repair effect can be guaranteed.

[0052] The thickness range of the printed antenna formed by liquid metal mixed with conductive paste in the embodiment of the present invention is controlled between 5μm and 20μm; if the thickness of the printed antenna is lower than this size range, the liquid metal may not be evenly coated in the silver paste system after sintering, and if the thickness of the printed antenna exceeds this size range, the printed antenna may be easily broken.

[0053] A washable electronic tag is also disclosed in an embodiment of the present invention. The layer structure in the washable electronic tag is stable and the layers are not easily separated from each other. It can also be used to solve the problem that the liquid metal in the printed antenna printed with the conductive paste mixed with liquid metal and conductive silver paste is easy to break through the restraint between the base layer and the adhesive layer when subjected to external pressure.

[0054] like Figure 6 As shown, the washable electronic tag in this embodiment includes: a base layer 21, a reinforcement layer 71, a printed antenna 22, a first adhesive layer 31 and a protective layer 8; wherein the reinforcement layer 7 is arranged on the surface of the base layer 21, the printed antenna is arranged on the surface of the reinforcement layer 71, and the size of the printed antenna 22 is smaller than the size of the reinforcement layer 71, and the printed antenna 22 is completely supported by the reinforcement layer 71; the base layer 21 and the protective layer 8 are combined by the reinforcement layer 71 and the first adhesive layer 31, and the printed antenna 22 is encapsulated therein; wherein the first adhesive layer 31 is located above the printed antenna 22, and at the same time contacts with the reinforcement layer 71 below the printed antenna 22.

[0055] Among them, one of the functions of the protective layer 8 is to cooperate with the base layer 21 to realize the packaging of the printed antenna 22, thereby achieving the functions of oxygen isolation, waterproofing and corrosion prevention.

[0056] The base layer 21 and the protective layer 8 may be made of flexible non-stretchable substrates, such as PI film, PET film and other flexible non-stretchable substrates in the prior art.

[0057] The reinforcing layer (adhesion enhancing layer) 71 has a roughened surface, which can enhance the bonding strength with the first adhesive layer 31. The printed antenna 22 covered by the reinforcing layer 71 and the first adhesive layer 31 has a stable initial shape pattern of the printed antenna 22 under the condition of the strong bonding strength between the reinforcing layer 71 and the first adhesive layer 31, that is, the structural stability of the water-washable electronic tag is enhanced, and the difficulty of the liquid metal in the printed antenna 22 migrating to the nearby non-antenna area under pressure is also enhanced, thereby ensuring the performance stability of the water-washable electronic tag.

[0058] The reinforcing layer 71 can select a special adhesion improver for the selected substrate, which can show good adhesion on the surface of the corresponding substrate, and the surface of the formed reinforcing layer can show good adhesion to the outside, so as to form an adhesion-enhancing film layer on the surface of the substrate; for example, for PI film, polyimide coating can be selected; the same is true for PET film; preferably, the reinforcing layer 71 in the embodiment of the present invention can be selected from a polydopamine film layer; it can be formed by coating a polydopamine solvent on the surface of the substrate and curing it, or by immersing the substrate in a polydopamine solvent and taking it out and curing it. Compared with other special coatings, polydopamine can be applied to the surface improvement of most substrates.

[0059] In some embodiments, the above-mentioned reinforcement layer 71 is a first reinforcement layer, and also includes: a second reinforcement layer 72, the second reinforcement layer is arranged on the surface of the protective layer 8, so that the first reinforcement layer 71 on the base layer 21 is connected to the second reinforcement layer 72 on the protective layer 8 through the first adhesive layer 31. Since the surfaces of the base layer 21 and the protective layer 8 are both adhesion-modified to form reinforcement layers, the bonding strength of the two is high under the bonding of the first adhesive layer 31, which further enhances the stability of the overall structure of the label and the binding force for the printed antenna.

[0060] Specifically, the base layer 21 and the protective layer 8 in the embodiment of the present invention may be made of other materials such as PI film, PET film, etc.

[0061] The present invention improves the bonding stability between the base layer and the protective layer by arranging a reinforcement layer on the surface of the base layer to improve its adhesion, thereby improving the structural stability of the washable electronic tag and ensuring its washing resistance.

[0062] like Figure 7As shown, the embodiment of strengthening the bonding stability between the washable electronic tag layer structures in this embodiment can be combined with the above-mentioned embodiment of improving the bending resistance of the washable electronic tag, and the protective layer 8 may include the above-mentioned bending protection layer, that is, the washable electronic tag, and the structure from top to bottom includes: a first bending protection layer 11, a second reinforcement layer 72, a first adhesive layer 31, a printed antenna 22, a first reinforcement layer 71, a base layer 21, a second adhesive layer 32, and a second bending protection layer 12.

[0063] In some embodiments, a third reinforcement layer 73 and / or a fourth reinforcement layer 74 may be further disposed between the base layer 21 and the second bending protection layer 12 .

[0064] Reference Figure 3-5 Furthermore, the protective layer of the electronic washing tag in the embodiment of the present invention may also include an outer protective layer located between the first bending protective layer 11 and the second bending protective layer 12, such as a first fabric layer 41 and a second fabric layer 42; wherein the first fabric layer 41 and the first bending protective layer 11 may be combined via a fourth adhesive layer 34; and the second fabric layer 42 and the second bending protective layer 12 may be combined via a fifth adhesive layer 35. By providing a fabric layer outside the tag body, the consistency between the electronic washing tag and the linen to which it is to be installed can be improved, thereby improving the user's comfort experience.

[0065] The bonding surfaces of the first bending protection layer 11 and the second bending protection layer 12 with the fourth adhesive layer 34 and the fifth adhesive layer 35 may be provided with a fifth reinforcement layer and a sixth reinforcement layer, respectively, so as to enhance the bonding force between the adhesive layers.

[0066] The above-mentioned washable electronic tag in the embodiment of the present invention can be used as a chipless tag, and the corresponding printed antenna adopts the chipless tag antenna specifications. The specific graphic size, etc. are not limited in this application.

[0067] In other embodiments, the washable electronic tag in the embodiment of the present invention may also include: a tag chip 5; the tag chip 5 may be directly connected to the printed antenna 22 in the antenna layer 2, or a tag chip that interacts with the printed antenna 22 through coupling mutual inductance may be used. The tag chip 5 does not need to be directly connected to the printed antenna 22, but only needs to be set at a designated position of the printed antenna, such as the center position, wherein the specific position of the coupled tag chip 5 is prior art, and this application does not elaborate on it. By selecting the tag chip 5, it can be set on the outer surface of the first bending protection layer 11 / the second bending protection layer 12, which can avoid the influence of setting it inside the bending protection layer on the bending resistance and structural stability of the printed antenna. The tag chip 5 can be fixed on the bending protection layer by various methods such as dispensing glue.

[0068] Preferably, the tag chip 5 can be arranged between the bending protection layer and the fabric layer, and the tag chip 5 can be limited and fixed by the structure formed by the adhesive layer between the bending protection layer and the fabric layer.

[0069] In some embodiments, the protective layer may also include a flexible and stretchable first anti-compression protective layer 61 and a second anti-compression protective layer 62 located between the bending protective layer and the fabric layer, and the tag chip 5 is arranged between the first bending protective layer 11 and the first anti-compression protective layer 61; through this structure, the tag chip 5 can have a certain amount of deformation displacement in the vertical direction, thereby offsetting / reducing the pressure on the tag chip during the industrial washing process of the water-washable electronic tag, and avoiding damage to the tag chip. Among them, the anti-compression protective layer can be selected from a fluid structure or a sheet structure, and its material can be selected from silicone, rubber, polyester, etc.

[0070] Preferably, the compression protection layer in the embodiment of the present invention can be made of vulcanized silicone or a silicone sheet for hot pressing, which can directly replace the adhesive layer between the bending protection layer and the fabric layer or cooperate with the adhesive layer to construct a stable layer structure.

[0071] In some embodiments, the fabric layer has a plain weave surface and a twill weave surface; wherein the twill weave surface is opposite to the adhesive layer, and the adhesive layer can be combined with the fabric layer by immersing the twill weave surface of the fabric layer. The burrs on the twill weave surface can be stably combined with the adhesive layer, thereby improving the stability of the combination of the two.

[0072] The conductive paste for printing the printed antenna 22 in the embodiment of the present invention may include: a polymer carrier, high melting point metal particles and a low melting point metal in liquid state at room temperature. The polymer carrier may include resin (water-washable / oily), thickener, diluent, and other functional additives; the high melting point metal may refer to a metal with a melting point above 300°C, and the low melting point metal may refer to a metal with a melting point below 30°C. Specifically, the high melting point metal particles may include but are not limited to silver powder, copper powder, silver-coated copper powder, and aluminum powder; the low melting point metal may include but are not limited to gallium-based alloys such as single gallium, gallium-indium alloy, gallium-indium-tin alloy, and gallium-indium-tin-zinc alloy.

[0073] In other embodiments, the conductive paste may also be conventional conductive silver paste, conductive aluminum paste, conductive copper paste, liquid metal, etc.; preferably, the conductive paste in the present application is a liquid metal mixed conductive paste directly formed by mixing liquid metal with conductive silver paste (aluminum paste). By mixing such low melting point metal into the silver paste, on the one hand, the flexibility of the printed antenna can be enhanced, and on the other hand, the printed antenna based on the liquid metal with fluidity can also play a self-recovery role even if it is broken due to bending, thereby ensuring the stability and reliability of the printed antenna. Preferably, the conductive silver paste can be selected from the silk-screen silver paste on the market.

[0074] The weight ratio of the liquid metal to the conductive silver paste in the embodiment of the present invention may be 1:30-30:1. For example, the weight ratio of the liquid metal to the conductive silver paste may be 1:30, 1:25, 1:20, 1:15, 1:10, 1:5, 1:3, 1:2, 2:3, 4:5, 1:1, 4:4, 3:2, 2:1, 3:1, 5:1, 10:1, 15:1, 20:1, 25:1, 25:1 or 30:1.

[0075] Preferably, the weight ratio of liquid metal to conductive silver paste is selected to be 1:20 to 1:2; if the proportion of liquid metal in the entire conductive paste exceeds the above range, the liquid metal content per unit area is relatively large. When the water-washed electronic tag is subjected to great pressure, the flowable liquid metal will not only migrate to the printed antenna circuit, but may also break through the bondage of the adhesive layer between the base layer 21 and the bending protection layer, thereby migrating outward from the original position of the printed antenna, causing the structural stability of the printed antenna to decrease, affecting the conductive performance of the printed antenna, and even causing local short circuit / fracture of the printed antenna. If the proportion of liquid metal in the entire conductive paste is lower than the above range, the liquid metal content per unit area is relatively small, and its fluidity becomes poor. When the water-washed electronic tag is bent to break the printed antenna, the liquid metal at the break will migrate to the surrounding circuits, but it is easily bound by the frame of the solidified silver paste in the surrounding circuits. After the bending is restored, it cannot be well recovered from the migration point, affecting the self-repair effect of the liquid metal. When within the above range, the problem of liquid metal migration under pressure is improved. Even if the printed antenna is broken, it can be pulled back to its original position by the solidified silver paste at the bend, and the self-repair effect can be guaranteed.

[0076] The thickness range of the printed antenna formed by liquid metal mixed with conductive paste in the embodiment of the present invention is controlled between 5μm and 20μm; if the thickness of the printed antenna is lower than this size range, the liquid metal may not be evenly coated in the silver paste system after sintering, and if the thickness of the printed antenna exceeds this size range, the printed antenna may be easily broken.

[0077] like Figure 8-10 Another object of the present invention is to provide a resistant-bending flexible electronic device, which is not easy to produce creases and can be used as the above-mentioned antenna layer 2, so as to improve the bending resistance of the water-washable electronic tag, and the printed antenna 22 is not easy to break. Specifically, the resistant-bending flexible electronic device includes: a mesh substrate 91, and a conductive circuit 92 attached to the target position of the mesh substrate 91; wherein the conductive circuit 92 is formed by the conductive slurry infiltrating into the mesh substrate and attached to the yarn surface at the target position, forming a conductive circuit running through both sides of the mesh substrate.

[0078] In the embodiment of the present invention, the mesh is used as the base of the conductive circuit, and the conductive circuit is attached to the surface of the mesh. Since the mesh fabric itself has good bending resistance and is not prone to creases, the bending resistance of the conductive circuit can be improved and it is not prone to breakage.

[0079] The conductive paste in this embodiment may include: a polymer carrier, high melting point metal particles and a low melting point metal in a liquid state at room temperature. The details may refer to the above embodiment and will not be described in detail here.

[0080] The anti-bending flexible electronics in the embodiment of the present invention combined with the liquid metal mixed conductive paste can further improve the bending resistance of the flexible electronics.

[0081] In some embodiments, it may further include: an encapsulation protection layer 93 covering the mesh substrate 91. The encapsulation protection layer 93 may include a laminated flexible and non-stretchable first encapsulation protection layer (such as the bending protection layer described above); and / or a flexible and stretchable second encapsulation protection layer (such as the compression protection layer described above).

[0082] In some embodiments, the invention may further include: a fabric layer (such as the above-mentioned fabric layer) disposed outside the protective layer 93 .

[0083] In some embodiments, it may also include: electronic components (such as resistors, inductors, capacitors, and other conventional components, as well as electronic chips) directly connected or coupled to the conductive circuit 92, and their positions may be set according to the actual requirements of the conductive circuit 92, and may also refer to the above content in this application or the prior art.

[0084] The anti-bending flexible electronics in the embodiment of the present invention can be used as RFID electronic tags and water-washable electronic tags. When used as such tags, the conductive circuit 92 is used as a tag antenna, and the electronic chip is a tag chip. In addition to RFID electronic tags, the anti-bending flexible electronics in this application can also be used in flexible electronic circuits and rigid electronic circuits, which are not limited here.

[0085] A multilayer flexible electronics is also disclosed in an embodiment of the present invention, comprising: at least two single-layer flexible electronics connected by overlapping; wherein each of the single-layer flexible electronics comprises: a mesh substrate, and a conductive circuit attached to a target position of the mesh substrate; wherein the conductive circuit is formed by infiltrating a conductive slurry into the mesh substrate and attached to the yarn surface at the target position to form a conductive circuit running through both sides of the mesh substrate; the conductive circuit contains connection points; the single-layer flexible electronics are connected by overlapping the connection points of their respective conductive circuits.

[0086] Furthermore, the multi-layer flexible electronics may also include: a protective layer covering the at least two single-layer flexible electronics connected by overlapping.

[0087] Furthermore, an insulating layer is provided between the single-layer flexible electronics in areas other than the connection points.

[0088] Specifically, the various embodiments in the present application can be combined with each other, for example, a water-washable electronic tag, whose structure from top to bottom includes: a first bending protection layer 11, a second reinforcement layer 72, a first adhesive layer 31, a printed antenna 22, a first reinforcement layer 71, a base layer 21, a third reinforcement layer 73, a second adhesive layer 32, a fourth reinforcement layer 74 and a second bending protection layer 12. Among them, the first bending protection layer 11, the second bending protection layer 12 and the base layer 21 are made of flexible non-stretchable materials, and the minimum curvature radius of the first bending protection layer 11 and / or the second bending protection layer 12 is greater than the curvature radius of the base layer 21; the printed antenna adopts liquid metal mixed conductive paste, preferably, the weight ratio of liquid metal to conductive silver paste in the conductive paste is selected to be 1:20 to 1:2.

[0089] The base layer 21 of the water-washable electronic tag in this embodiment is protected by the bending of the first bending protection layer 11 and the second bending protection layer 12, which can effectively reduce the risk of creases on the base layer 21 itself, thereby reducing the probability of the printed antenna 22 attached to the base layer 21 being broken; and by using liquid metal conductive paste and by forming a reinforcement layer on the surface of the base layer 21, the first bending protection layer 11, and the second bending protection layer 12 to enhance the bonding stability between the layers of the water-washable electronic tag, the difficulty of making the printed antenna of the water-washable electronic tag can be reduced, which can be achieved by mature printing technology in the prior art. In addition, the improvement of the bonding force between the middle structure of the water-washable electronic tag further limits the migration of the liquid metal in the printed antenna, which can greatly reduce the liquid metal breaking through the adhesive area around the printed antenna when the printed antenna is under pressure. In addition, by selecting a liquid metal mixed conductive paste with a weight ratio of liquid metal to conductive silver paste in the conductive paste in the range of 1:20 to 1:2, the unexpected migration of the liquid metal when the printed antenna is under pressure can be further reduced, and the self-repairing ability of the liquid metal in the printed antenna can be ensured. That is, the washable electronic tag formed by the above combination can greatly improve the industrial washing resistance of the washable electronic tag and ensure the structural stability and functional reliability of the washable electronic tag.

[0090] This embodiment may also include a fifth reinforcement layer and a sixth reinforcement layer located outside the first bending protection layer and the second bending protection layer; it may also include a first compression protection layer, a second bending protection layer, a first fabric layer, a second fabric layer, and a fourth adhesive layer and a fifth adhesive layer connecting the two, as well as a coupling tag chip working in conjunction with the printed antenna. The specific material selection and position setting can refer to the above embodiments and will not be repeated here.

[0091] A washable electronic tag in another combined embodiment can replace the base layer with a mesh base based on the above-mentioned embodiment of the washable electronic tag, and the liquid metal mixed conductive slurry penetrates into the mesh base to form a printed antenna; the first reinforcement layer 71 and the third reinforcement layer 73 are not only attached to the surface fibers of the mesh base, but also penetrate into the mesh of the mesh base, thereby ensuring the stable adhesion of the conductive slurry in the mesh of the mesh base.

[0092] The remaining structures can be based on this, refer to the above embodiments, and will not be described in detail here.

[0093] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein can all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present disclosure.

Claims

1. A RFID washable electronic tag, characterized in that: include: A substrate layer, a first reinforcement layer, a printed antenna, a first adhesive layer, a second reinforcement layer and a protective layer; wherein the first reinforcement layer is arranged on the surface of the substrate layer; the printed antenna is formed on the surface of the first reinforcement layer, the second reinforcement layer is arranged on the side of the protective layer facing the printed antenna, and the size of the printed antenna is smaller than that of the first reinforcement layer; the first reinforcement layer on the substrate layer is combined with the second reinforcement layer of the protective layer through the first adhesive layer, and the protective layer covers the printed antenna; The first reinforcement layer and the second reinforcement layer are used to improve the surface adhesion of the substrate layer and the protective layer respectively.

2. The RFID washable electronic tag according to claim 1, characterized in that: The substrate layer and / or the protective layer are made of flexible and non-stretchable materials.

3. The RFID washable electronic tag according to claim 1, characterized in that: The first reinforcement layer and / or the second reinforcement layer is a polydopamine film layer.

4. The RFID washable electronic tag according to claim 1, characterized in that: Along the direction away from the printed antenna, the protective layer includes in sequence: a bending protective layer, a compression protective layer and a fabric layer; the compression protective layer is combined with the bending protective layer through a second adhesive layer; and the fabric layer is arranged on the outside of the compression protective layer.

5. The RFID washable electronic tag according to claim 4, characterized in that: Also includes: A label chip is arranged between the bending protection layer and the anti-compression protection layer.

6. The RFID washable electronic tag according to claim 4, characterized in that: The compression-resistant protective layer is made of a flexible and stretchable material.

7. The RFID washable electronic tag according to claim 6, characterized in that: The compression-resistant protective layer is made of silica gel.

8. The RFID washable electronic tag according to claim 7, characterized in that: The fabric layer has a plain weave surface and a twill weave surface; The silica gel is bonded to the fabric layer by being impregnated into the twill weave surface of the fabric layer.

9. The RFID washable electronic tag according to claim 1, characterized in that: The printed antenna is a conductive paste formed by mixing liquid metal and conductive silver paste.

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