Electronic anti-theft label for fresh food

Abstract

The invention discloses an electronic anti-theft label for fresh food, and relates to the technical field of electronic anti-theft labels, the electronic anti-theft label comprises a surface layer, a bottom paper layer and an inner layer, the surface layer, the bottom paper layer and the inner layer are bonded through an adhesive layer, and a coil layer comprises a coil layer capacitance plate and a coil. The coil layer capacitor plate and the coil connected with the coil layer capacitor plate into a whole form a circuit, the capacitor layer is composed of a main capacitor and a capacitor layer coil connected with the main capacitor into a whole, and additional supporting layers are arranged outside the surface layer, the bottom paper layer and the inner layer. The anti-deformability label has the advantages that the additional supporting layers are arranged on the inner layer and the outer layer of the label to enhance the anti-deformability of the label, the overall anti-deformability of the 150u aluminum foil is enhanced, the center frequency drift is reduced, the resistance value of a circuit is reduced through the thicker conductor, the performance of the label is improved, and the service life of the label is prolonged. And the possibility of sparking combustion is reduced through the thick conductor, so that the stability of the center frequency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic anti-theft tags, and particularly to an electronic anti-theft tag for fresh food. Background Art

[0002] Fresh food refers to those fresh and perishable foods, usually including fresh fruits, vegetables, meats, seafood, poultry, dairy products, etc. These foods usually need to be consumed within a short period of time because they are vulnerable to bacteria and microorganisms, which can lead to spoilage and deterioration. Fresh food usually requires anti-theft tag management during transportation and sales. Electronic anti-theft tags are an advanced technology that can help retailers and producers track the location and status of products and trigger alarms when needed. Electronic anti-theft tags are a security device that uses electronic technology to prevent goods from being stolen. However, traditional devices are prone to deformation under the influence of external forces during cold storage, resulting in a shift in the center frequency, which leads to a deterioration in the detection effect and the inability to meet the two customer demand goals of label miniaturization and microwave oven use safety. For this reason, we propose an electronic anti-theft tag for fresh food. Summary of the Invention

[0003] The purpose of the present invention is to provide an electronic anti-theft tag for fresh food.

[0004] To solve the problems raised in the above background art, the present invention provides the following technical solution: An electronic anti-theft tag for fresh food, comprising a surface layer, a backing paper layer, and an inner layer. The inner layer includes a coil layer, a capacitor layer, and a dielectric layer. The surface layer, the backing paper layer, and the inner layer are bonded together through an adhesive layer. The coil layer includes coil layer capacitor plates and a coil. The coil layer capacitor plates and the coil connected to them form a circuit. The capacitor layer is composed of a main capacitor and a capacitor layer coil connected to it. An optional additional support layer is provided outside the surface layer, the backing paper layer, and the inner layer, including the following steps: The first step: By using aluminum foil with a thickness exceeding 150u for design, the overall anti-deformation ability is enhanced, and the center frequency drift is reduced; The second step: By using aluminum foil with a thickness exceeding 150u for design, the thicker conductor reduces the resistance value of the circuit and improves the performance of the tag; The third step: By using aluminum foil with a thickness exceeding 150u for design, the thicker conductor reduces the possibility of arcing and combustion; The fourth step: Using a high dielectric constant dielectric and adhesive to reduce the capacitor area; Fifth step: By improving the smoothness of the coil edge, increasing the radian of the corner, reducing the generation of burrs, and avoiding tip discharge, multi-turn inductive tags can also be safely used in a microwave oven. The multi-turn inductor can obtain a larger inductance value under the same coil and coil cross-sectional area, solving the problem of the increase in the center frequency of the tag.

[0005] As a further solution of the present invention: An additional support layer is provided inside the surface layer, the base paper layer and the inner layer, and the additional support layer can enhance the anti-deformation ability of the tag.

[0006] As a further solution of the present invention: In step four, the calculation formula of the parallel-plate capacitor is C = εA / d. By increasing the dielectric constant, a larger capacitance value can be obtained when other factors remain unchanged, solving the problem of the increase in the center frequency of the tag.

[0007] As a further solution of the present invention: In step five, the calculation formula of the inductance is L = (μ0 * μr * N 2 * A) / l, where L is the inductance value, and the unit of the inductance value is Henry. μ0 is the magnetic permeability in vacuum (about 4π * 10 -7 H / m).

[0008] As a further solution of the present invention: In the calculation formula of the inductance, μr is the relative magnetic permeability of the coil, N is the number of turns of the coil, A is the cross-sectional area of the coil, and l is the length of the coil.

[0009] As a further solution of the present invention: The calculation formula of the center frequency of the tag is f = 1 / (2π√(LC)), where f represents the frequency, π is the pi, L represents the value of the inductance, and C represents the value of the capacitance.

[0010] As a further solution of the present invention: Among them, the most commonly used center frequency of the EAS tag is 8.2 MHZ.

[0011] As a further solution of the present invention: The humidity sensing device includes a humidity sensor, a controller, a micro humidifier, and a circulation fan. The temperature sensor is communicatively connected to the controller, and the controller is communicatively connected to the micro humidifier and the circulation fan.

[0012] Adopting the above technical solutions, compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, the additional support layer is arranged inside and outside the tag to enhance the anti-deformation ability of the tag. The anti-deformation ability of the overall 150u aluminum foil is strengthened, reducing the center frequency drift. The resistance value of the circuit is reduced by a thicker conductor, improving the performance of the tag, and the possibility of ignition and combustion is reduced by the thick conductor, thereby improving the center frequency stability; 2. By improving the smoothness of the coil edge, increasing the radian of the corner, reducing the generation of burrs, and avoiding tip discharge, the multi-turn inductive label can also be safely used in a microwave oven. The multi-turn inductor can obtain a larger inductance value under the condition of the same coil and coil cross-sectional area, solve the problem of the increase in the center frequency of the label, and further reduce the risk of microwave oven ignition when the label is accidentally put into the microwave oven by the customer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic flowchart of steps in an embodiment of the present invention; Figure 2 It is a schematic model diagram in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following further describes the specific embodiments of the present invention with reference to the drawings. It should be noted here that the description of these embodiments is for helping to understand the present invention, but does not limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0015] Embodiment 1. Please refer to the attached Figure 1 - attached Figure 2 , the present invention provides a technical solution: an electronic anti-theft label for fresh food, including a surface layer, a backing paper layer and an inner layer. The inner layer includes a coil layer, a capacitor layer and a dielectric layer. The surface layer, the backing paper layer and the inner layer are bonded together through an adhesive layer. The coil layer includes coil layer capacitor plates and coils. The coil layer capacitor plates and the coils connected to them form a circuit. The capacitor layer is composed of a main capacitor and capacitor layer coils connected to it. An optional additional support layer is provided outside the surface layer, the backing paper layer and the inner layer, including the following steps: The first step: By using aluminum foil with a thickness exceeding 150u for design, the overall anti-deformation ability is strengthened, and the center frequency drift is reduced; The second step: By using aluminum foil with a thickness exceeding 150u for design, the thicker conductor reduces the resistance value of the circuit and improves the performance of the label; The third step: By using aluminum foil with a thickness exceeding 150u for design, the thicker conductor reduces the possibility of ignition and combustion; The fourth step: Use a medium and adhesive with a high dielectric constant to reduce the capacitance area; The fifth step: By improving the smoothness of the coil edge, increasing the radian of the corner, reducing the generation of burrs, and avoiding tip discharge, the multi-turn inductive label can also be safely used in a microwave oven. The multi-turn inductor can obtain a larger inductance value under the condition of the same coil and coil cross-sectional area, and solve the problem of the increase in the center frequency of the label.

[0016] Please refer to the attachedFigure 1 - Attachment Figure 2 , an additional support layer is provided inside the surface layer, the base paper layer and the inner layer. The additional support layer can enhance the anti-deformation ability of the label. In Step 4, the calculation formula of the parallel-plate capacitor is C = εA / d. By increasing the dielectric constant, a larger capacitance value can be obtained under the condition that other factors remain unchanged, thus solving the problem of the increase in the center frequency of the label. In Step 5, the calculation formula of the inductor is L = (μ0 * μr * N 2 * A) / l, where L is the inductance value, and the unit of the inductance value is Henry. μ0 is the magnetic permeability in vacuum (about 4π * 10 -7 H / m); In this embodiment, the technical difficulty of the electronic label is to necessarily solve the problem of the increase in the center frequency of the label caused by the reduction of the capacitance and inductance values due to the reduction of the label area. Moreover, fresh food is often packaged simply, and the electronic anti-theft label attached to it is prone to deformation, which affects the center frequency of the electronic anti-theft label and reduces the detection effect. At the same time, the electronic label contains a metal film structure. When it is put into a microwave oven together with food for thawing, safety problems such as sparking and burning may occur. In order to reduce the occurrence of the above problems, the overall anti-deformation ability is strengthened through the design of 150u aluminum foil, reducing the center frequency drift. The thicker conductor reduces the resistance value of the circuit, improving the performance of the label. The thicker conductor reduces the possibility of sparking and burning. First, the center frequency calculation formula of the label is f = 1 / (2π√(LC)), and the parallel-plate capacitance is calculated by the formula C = εA / d. By increasing the dielectric constant, a larger capacitance value can be obtained under the condition that other factors remain unchanged, thus solving the problem of the increase in the center frequency of the label. The additional support layer is marked as (Icon 1), 150u aluminum foil (Figure Identification 2, Figure Identification 6), high-dielectric-constant medium (Figure Identification 4), and glue (Figure Identification 5, Figure Identification 6).

[0017] During use, the anti-deformation ability of the label is strengthened by providing the additional support layer inside and outside the label. The overall anti-deformation ability of the 150u aluminum foil is strengthened, reducing the center frequency drift. The thicker conductor reduces the resistance value of the circuit, improving the performance of the label. And the thicker conductor reduces the possibility of sparking and burning, thereby improving the center frequency stability.

[0018] Embodiment 2. Please refer to Attachment Figure 1 - Attachment Figure 2, the present invention provides a technical solution: an electronic anti-theft tag for fresh food, including a surface layer, a base paper layer and an inner layer. The inner layer includes a coil layer, a capacitor layer and a dielectric layer. The surface layer, the base paper layer and the inner layer are bonded together through an adhesive layer. The coil layer includes coil layer capacitor plates and coils. The coil layer capacitor plates and the coils connected integrally therewith form a circuit. The capacitor layer is composed of a main capacitor and capacitor layer coils connected integrally therewith. An optional additional support layer is provided outside the surface layer, the base paper layer and the inner layer, including the following steps: The first step: By using aluminum foil with a thickness exceeding 150u for design, the overall anti-deformation ability is enhanced, and the center frequency drift is reduced; The second step: By using aluminum foil with a thickness exceeding 150u for design, the thicker conductor reduces the resistance value of the circuit and improves the performance of the tag; The third step: By using aluminum foil with a thickness exceeding 150u for design, the thicker conductor reduces the possibility of arcing and combustion; The fourth step: Use a medium and adhesive with a high dielectric constant to reduce the capacitor area; The fifth step: By improving the smoothness of the coil edge, increasing the radian of the corner, reducing the generation of burrs, avoiding tip discharge, enabling the multi-turn inductance tag to be safely used in a microwave oven. The multi-turn inductance can obtain a larger inductance value under the condition of the same coil and coil cross-sectional area, and solve the problem of the increase in the center frequency of the tag.

[0019] Please refer to the appendix Figure 2 , in the calculation formula of inductance, μr is the relative magnetic permeability of the coil, N is the number of turns of the coil, A is the cross-sectional area of the coil, l is the length of the coil. The calculation formula for the center frequency of the tag is f = 1 / (2π√(LC)), where f represents the frequency, π is the pi, L represents the value of inductance, and C represents the value of capacitance. Among them, the most commonly used center frequency of the EAS tag is 8.2MHZ. The humidity sensing device includes a humidity sensor, a controller, a micro humidifier and a circulation fan. The temperature sensor is communicatively connected to the controller, and the controller is communicatively connected to the micro humidifier and the circulation fan; In this embodiment, too high humidity in the air will reduce the performance of the electronic tag. In a dry environment, the tag is prone to generate static electricity, which may cause the tag to fail to be detected. The humidity sensor can detect the air humidity around the electronic tag, and the humidity sensor is set with a preset value nt, where 40% < nt < 60%. When the humidity sensor detects that the absolute humidity in the air < 40%, it will transmit a T1 type signal to the controller. When the humidity sensor detects that the absolute humidity in the air > 60%, it will transmit a T2 type signal to the controller. After receiving the T1 / T2 type signal, the controller will respectively start the micro-humidifier to increase the humidity in the air and start the circulation fan to accelerate the air circulation to reduce the absolute humidity in the air. The material for using the additional support layer can be materials such as PVC silicon oil paper. When the area of the tag shrinks, it will cause the inductance value of the capacitor to shrink, resulting in an increase in the center frequency of the tag. By improving the smoothness of the coil edge, increasing the radian of the corner, reducing the generation of burrs, and avoiding tip discharge, the multi-turn inductance can obtain a larger inductance value under the condition of the same cross-sectional area of the coil, thus solving the problem of the increase in the center frequency of the tag.

[0020] During use, by improving the smoothness of the coil edge, increasing the radian of the corner, reducing the generation of burrs, and avoiding tip discharge, the multi-turn inductance tag can also be safely used in the microwave oven. The multi-turn inductance can obtain a larger inductance value under the condition of the same cross-sectional area of the coil, thus solving the problem of the increase in the center frequency of the tag. Furthermore, it can reduce the situation where the tag is accidentally put into the microwave oven by the customer, and avoid the danger of microwave oven arcing.

[0021] Working principle: First step: First, by using aluminum foil with a thickness exceeding 150u for design, the overall anti-deformation ability is strengthened, and the center frequency drift is reduced; Second step: By using aluminum foil with a thickness exceeding 150u for design, the thicker conductor reduces the resistance value of the circuit and improves the performance of the tag; Third step: By using aluminum foil with a thickness exceeding 150u for design, the thicker conductor reduces the possibility of arcing and burning; Fourth step: Use a medium and glue with a high dielectric constant to reduce the capacitance area; Fifth step: By improving the smoothness of the coil edge, increasing the radian of the corner, reducing the generation of burrs, and avoiding tip discharge, the multi-turn inductance tag can also be safely used in the microwave oven. The multi-turn inductance can obtain a larger inductance value under the condition of the same cross-sectional area of the coil, thus solving the problem of the increase in the center frequency of the tag.

[0022] Those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented by a general-purpose computer device. Optionally, they can be implemented by program codes executable by the computing device, so that they can be stored in the storage device and executed by the computing device, or they can be separately fabricated into individual integrated circuit modules, or multiple modules or steps among them can be fabricated into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0023] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0024] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. An electronic anti-theft label for fresh food, comprising a surface layer, a backing paper layer and an inner layer. The inner layer includes a coil layer, a capacitor layer and a dielectric layer. The surface layer, the backing paper layer and the inner layer are adhered through an adhesive layer. The coil layer includes coil layer capacitor plates and a coil. The coil layer capacitor plates and the coil connected integrally therewith form a circuit. The capacitor layer is composed of a main capacitor and a capacitor layer coil connected integrally therewith. An additional support layer is provided outside the surface layer, the backing paper layer and the inner layer, and a humidity sensing device is provided on the outer surface of the additional support layer. It is characterized in that: Including the preparation of anti-theft tags, the following steps are adopted: The first step: By using aluminum foil with a thickness exceeding 150u for design, the overall anti-deformation ability is strengthened, and the center frequency drift is reduced; The second step: By using aluminum foil with a thickness exceeding 150u for design, the conductor reduces the resistance value of the circuit and improves the performance of the tag; The third step: By using aluminum foil with a thickness exceeding 150u for design, the conductor reduces the possibility of sparking and burning; The fourth step: Use a medium and glue with a high dielectric constant to reduce the capacitance area; The fifth step: By improving the smoothness of the coil edge, increasing the radian of the corner, reducing the generation of burrs, and avoiding tip discharge, the multi-turn inductance tag can also be safely used in a microwave oven. The multi-turn inductance can obtain a larger inductance value under the condition of the same coil and coil cross-sectional area, and solve the problem of the increase in the center frequency of the tag.

2. The electronic anti-theft tag for fresh food according to claim 1, characterized in that: An additional support layer is arranged inside the surface layer, the base paper layer and the inner layer, and the additional support layer can enhance the anti-deformation ability of the tag.

3. An electronic anti-theft label for fresh food according to claim 1, characterized in that: In the fourth step, the calculation formula of the parallel-plate capacitor is C = εA / d, where C represents the capacitance, ε represents the dielectric constant, A represents the plate area of the capacitor, and d represents the distance between the plates. By increasing the dielectric constant, a larger capacitance value can be obtained when other factors remain unchanged, and the problem of the increase in the center frequency of the tag can be solved.

4. An electronic anti-theft label for fresh food according to claim 1, characterized in that: In step five, the calculation formula for the inductance is L = (μ0 * μr * N² * A) / l, where L is the inductance value, and the unit of the inductance value is Henry. μ0 is the magnetic permeability in a vacuum (which is 4π * 10⁻ 7 H / m).

5. An electronic anti-theft label for fresh food according to claim 4, characterized in that: In the calculation formula of the inductance, μr is the relative magnetic permeability of the coil, N is the number of turns of the coil, A is the cross-sectional area of the coil, and l is the length of the coil.

6. The electronic anti-theft label for fresh food according to claim 1, wherein: The calculation formula for the center frequency of the tag is: where f represents frequency is the ratio of a circle's circumference to its diameter, L represents the value of inductance, and C represents the value of capacitance.

7. An electronic anti-theft label for fresh food according to claim 1, characterized in that: Among them, the most commonly used center frequency of the EAS tag is 8.2MHZ.

8. An electronic anti-theft label for fresh food according to claim 1, characterized in that: The humidity sensing device includes a humidity sensor, a controller, a micro humidifier, and a circulation fan. The temperature sensor is communicatively connected to the controller, and the controller is communicatively connected to the micro humidifier and the circulation fan.

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