Preparation method of metal antenna pattern of radio frequency identification tag

Abstract

The invention discloses a method for preparing a metal antenna pattern of a radio frequency identification tag, which comprises the following steps of: coating a pattern adhesive layer on one surface of a first flexible substrate layer, the pattern adhesive layer being a high-adhesion and heat-resistant adhesive layer; a laser cutting module is adopted for cutting, the shape and the position of the cutting path of the laser cutting module on the metal foil are the same as those of the pattern of the pattern glue layer, and laser cuts through in the thickness direction of the metal foil; coating one surface of the second flexible base material layer with a low-adhesion adhesive layer; stripping the second flexible base material layer from the first flexible base material layer, and adhering the metal foil to the low-adhesion adhesive layer in a region where the metal foil is not positioned on the pattern adhesive layer, so as to form a metal foil pattern on the surface of the pattern adhesive layer on the surface of the first flexible base material layer. According to the invention, the preparation of the high-precision antenna pattern is realized in a short time, the adhesive force and reliability of the product are improved, the influence on the environment is reduced, the production cost can be effectively reduced, and the consistency, production efficiency and stability of the product are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency identification tags, and in particular to a method for preparing a metal antenna pattern of a radio frequency identification tag. Background Art

[0002] Driven by the modern Internet of Things and intelligent applications, RFID (Radio Frequency Identification) technology has been widely used, especially in the fields of supply chain management, logistics tracking, identity authentication, etc. As one of the core components of the RFID system, the performance of the RFID metal antenna directly affects the reading distance and recognition accuracy of the RFID tag. Therefore, how to effectively prepare high-performance, low-cost RFID metal antenna patterns has become an important technical challenge.

[0003] At present, the preparation methods of RFID metal antennas mainly include screen printing, photolithography plus metal etching, vacuum coating and laser direct writing. Screen printing is a relatively mature process (such as CN202210989487.5), which can quickly form metal patterns on flexible substrates, but because silver paste is usually used as a conductive material, the cost is high, and there are certain problems with adhesion and reliability. Although the photolithography plus metal etching process (such as CN202122303045.4) performs well in terms of antenna performance consistency, most of the metal is etched away, the material utilization rate is low, the production speed is slow, and a large amount of chemical solution is required during the process, which poses environmental problems. The vacuum coating method has a faster production speed, but its wide application is limited by the thin coating layer, poor conductivity, and large equipment investment. Although the laser direct writing method of metal electrode patterns (such as CN108326434A) has the advantages of high precision and flexible pattern adjustment, and reduces the use of chemical etchants and reduces environmental pollution, the process is complex, has high requirements on equipment, and the efficiency of laser metal removal is low, which affects the feasibility of large-scale production. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a metal antenna pattern of a radio frequency identification tag. The method for preparing a metal antenna pattern of a radio frequency identification tag can realize the preparation of a high-precision antenna pattern in a relatively short time, improve the adhesion and reliability of the product, reduce the impact on the environment, and effectively reduce production costs, and improve product consistency, production efficiency and stability.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a method for preparing a metal antenna pattern of a radio frequency identification tag, comprising the following steps: Step 1: using a roll-to-roll device to coat a surface of the first flexible substrate layer with a patterned adhesive layer, wherein the patterned adhesive layer is an adhesive layer with high adhesion and heat resistance; Step 2: Using a roll-to-roll device, attach the metal foil to the surface of the pattern adhesive layer opposite to the first flexible substrate layer; Step 3: Cutting with a laser cutting module, wherein the shape and position of the cutting path of the laser cutting module on the metal foil are the same as the pattern of the pattern adhesive layer, and the laser cuts through the metal foil in the thickness direction; Step 4: using a roll-to-roll device to coat a surface of the second flexible substrate layer with a low-adhesion adhesive layer; Step 5, bringing the low-adhesion adhesive layer on the second flexible substrate layer into face-to-face contact with the patterned adhesive layer in step 3 under pressure; Step 6: peel the second flexible substrate layer from the first flexible substrate layer, and adhere the metal foil to the low-adhesion adhesive layer in the area to be removed where the metal foil is not on the pattern adhesive layer, thereby forming a metal foil pattern on the surface of the pattern adhesive layer on the surface of the first flexible substrate layer.

[0006] The technical solution further improved in the above technical solution is as follows: 1. In the above solution, the first flexible substrate layer is a PET film or a PP film.

[0007] 2. In the above solution, the patterned adhesive layer is formed on the surface of the first flexible substrate layer by gravure printing or micro-gravure printing.

[0008] 3. In the above solution, the metal foil is aluminum foil or copper foil.

[0009] 4. In the above solution, the thickness of the metal foil is 1~20μm.

[0010] 5. In the above solution, the low-adhesion adhesive layer is a high-flexibility silicone layer or a high-flexibility acrylic adhesive layer. Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The invention discloses a method for preparing a metal antenna pattern of a radio frequency identification tag.

[0011] The RFID metal antenna pattern is prepared by a two-step roll-to-roll process, wherein the first step includes coating a glue layer pattern on a flexible substrate and attaching a metal foil to the glue layer pattern, and the second step includes cutting the metal foil by a laser cutting module and forming a metal antenna pattern by peeling off the glue layer. The design of this process is innovative in improving production efficiency, reducing material waste, and realizing high-precision pattern production. The laser cutting module is introduced into the roll-to-roll process to realize accurate cutting of the metal foil, thereby improving cutting efficiency and precision. The metal foil pattern peeling method includes peeling off the metal foil portion that is not adhered to the glue layer pattern by a low-adhesion glue layer on the flexible substrate to form a precise metal antenna pattern. The peeling process not only ensures the integrity and precision of the metal foil pattern, but also can realize large-scale production on the basis of low cost and high efficiency production. In summary, the present invention realizes the preparation of a high-precision antenna pattern in a relatively short time, improves the adhesion and reliability of the product, reduces the impact on the environment, and can effectively reduce production costs, and improve product consistency, production efficiency and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 It is a schematic diagram of the process of preparing the metal antenna pattern of the radio frequency identification tag of the present invention; Attached Figure 2 This is a schematic diagram of the roll-to-roll equipment structure used in the preparation method of the present invention.

[0013] In the above figures: 1. first flexible substrate layer; 2. pattern adhesive layer; 3. metal foil; 4. second flexible substrate layer; 5. low adhesion adhesive layer; 6. metal foil pattern; 7. area to be removed. DETAILED DESCRIPTION

[0014] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0015] The present invention will be further described below in conjunction with embodiments: Embodiment 1: A method for preparing a metal antenna pattern of a radio frequency identification tag, comprising the following steps: Step 1: Use a roll-to-roll device to coat one surface of the first flexible substrate layer 1 with a patterned adhesive layer 2, wherein the patterned adhesive layer 2 is a highly adhesive and heat-resistant adhesive layer to ensure the stability and adhesion of the metal foil in subsequent processing; and attach the metal foil to the patterned adhesive layer 1 on the same roll-to-roll device. Figure 1 The metal foil can be aluminum foil, copper foil, etc., with a thickness of 1 micron to 20 microns. See the attached schematic diagram of the roll-to-roll equipment. Figure 2 ; Step 2: Using a roll-to-roll device, attach the metal foil 3 to the surface of the pattern adhesive layer 2 opposite to the first flexible substrate layer 1; Step 3: cutting with a laser cutting module. The shape and position of the cutting path of the laser cutting module on the metal foil 3 are the same as the pattern of the pattern adhesive layer 2. The laser cuts through the metal foil 3 in the thickness direction. Step 4: using a roll-to-roll device to coat one surface of the second flexible substrate layer 4 with a low-adhesion adhesive layer 5; Step 5: The low-adhesion adhesive layer 5 on the second flexible substrate layer 4 is brought into face-to-face contact with the patterned adhesive layer 2 of step 3 under pressure; Step 6: peel off the second flexible substrate layer 4 from the first flexible substrate layer 1 , and adhere the metal foil 3 in the to-be-removed area 7 not on the pattern adhesive layer 2 to the low-adhesion adhesive layer 5 , thereby forming a metal foil pattern 6 on the surface of the pattern adhesive layer 2 on the surface of the first flexible substrate layer 1 .

[0016] The first flexible substrate layer 1 is a PP film.

[0017] The patterned adhesive layer 2 is formed on the surface of the first flexible substrate layer 1 by gravure printing or micro-gravure printing.

[0018] The metal foil 3 is an aluminum foil, and the thickness of the metal foil 3 is 5 μm.

[0019] The low-adhesion adhesive layer 5 is a highly flexible acrylic adhesive layer.

[0020] The laser cutting module further comprises: a laser generator, a spectrometer and a galvanometer scanning unit.

[0021] Embodiment 2: A method for preparing a metal antenna pattern of a radio frequency identification tag, comprising the following steps: Step 1: Use a roll-to-roll device to coat one surface of the first flexible substrate layer 1 with a patterned adhesive layer 2, wherein the patterned adhesive layer 2 is a highly adhesive and heat-resistant adhesive layer to ensure the stability and adhesion of the metal foil in subsequent processing; and attach the metal foil to the patterned adhesive layer 1 on the same roll-to-roll device. Figure 1 The metal foil can be aluminum foil, copper foil, etc., with a thickness of 1 micron to 20 microns. See the attached schematic diagram of the roll-to-roll equipment. Figure 2 ; Step 2: Using a roll-to-roll device, attach the metal foil 3 to the surface of the pattern adhesive layer 2 opposite to the first flexible substrate layer 1; Step 3: cutting with a laser cutting module. The shape and position of the cutting path of the laser cutting module on the metal foil 3 are the same as the pattern of the pattern adhesive layer 2. The laser cuts through the metal foil 3 in the thickness direction. Step 4: using a roll-to-roll device to coat one surface of the second flexible substrate layer 4 with a low-adhesion adhesive layer 5; Step 5: The low-adhesion adhesive layer 5 on the second flexible substrate layer 4 is brought into face-to-face contact with the patterned adhesive layer 2 of step 3 under pressure; Step 6: peel off the second flexible substrate layer 4 from the first flexible substrate layer 1 , and adhere the metal foil 3 in the to-be-removed area 7 not on the pattern adhesive layer 2 to the low-adhesion adhesive layer 5 , thereby forming a metal foil pattern 6 on the surface of the pattern adhesive layer 2 on the surface of the first flexible substrate layer 1 .

[0022] The first flexible substrate layer 1 is a PET film.

[0023] The patterned adhesive layer 2 is formed on the surface of the first flexible substrate layer 1 by gravure printing or micro-gravure printing.

[0024] The metal foil 3 is a copper foil, and the thickness of the metal foil 3 is 12 μm.

[0025] The low-adhesion adhesive layer 5 is a highly flexible silicone layer.

[0026] The laser cutting module further comprises: a laser generator, a spectrometer and a galvanometer scanning unit.

[0027] When the above-mentioned method for preparing the metal antenna pattern of the radio frequency identification tag is adopted, the RFID metal antenna pattern is prepared by a two-step roll-to-roll process, wherein the first step includes coating a glue layer pattern on a flexible substrate and attaching a metal foil to the glue layer pattern, and the second step is to cut the metal foil by a laser cutting module and form a metal antenna pattern by peeling off the glue layer. The design of this process is innovative in improving production efficiency, reducing material waste and realizing high-precision pattern production; the laser cutting module is introduced into the roll-to-roll process to realize accurate cutting of the metal foil, thereby improving cutting efficiency and precision; the method for peeling off the metal foil pattern: the metal foil part that is not adhered to the glue layer pattern is peeled off by the low-adhesion glue layer on the flexible substrate to form an accurate metal antenna pattern, and the peeling process not only ensures the integrity and precision of the metal foil pattern, but also can realize large-scale production on the basis of low cost and efficient production; in summary, the present invention realizes the preparation of a high-precision antenna pattern in a relatively short time, improves the adhesion and reliability of the product, reduces the impact on the environment, and can effectively reduce the production cost, and improve the consistency, production efficiency and stability of the product.

[0028] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a metal antenna pattern of a radio frequency identification tag, characterized in that: The following steps are involved: Step 1: using a roll-to-roll device to coat a surface of the first flexible substrate layer (1) with a patterned adhesive layer (2), wherein the patterned adhesive layer (2) is an adhesive layer with high adhesion and heat resistance; Step 2: Using a roll-to-roll device, attach the metal foil (3) to the surface of the patterned adhesive layer (2) opposite to the first flexible substrate layer (1); Step 3: Cutting with a laser cutting module, wherein the path shape and position of the cutting of the metal foil (3) by the laser cutting module are the same as the pattern of the patterned adhesive layer (2), and the laser cuts through the metal foil (3) in the thickness direction; Step 4: using a roll-to-roll device to coat a surface of the second flexible substrate layer (4) with a low-adhesion adhesive layer (5); Step 5: bringing the low-adhesion adhesive layer (5) on the second flexible substrate layer (4) into face-to-face contact with the patterned adhesive layer (2) in step 3 under pressure; Step 6: Peel off the second flexible substrate layer (4) from the first flexible substrate layer (1), and adhere the metal foil (3) to the low-adhesion adhesive layer (5) in the area (7) to be removed that is not on the pattern adhesive layer (2), thereby forming a metal foil pattern (6) on the surface of the pattern adhesive layer (2) on the surface of the first flexible substrate layer (1).

2. The method for preparing a radio frequency identification tag metal antenna pattern according to claim 1, characterized in that: The first flexible substrate layer (1) is a PET film or a PP film.

3. The method for preparing a radio frequency identification tag metal antenna pattern according to claim 1, characterized in that: The patterned adhesive layer (2) is formed on the surface of the first flexible substrate layer (1) by means of a gravure printing or micro-gravure printing process.

4. The method for preparing a radio frequency identification tag metal antenna pattern according to claim 1, characterized in that: The metal foil (3) is aluminum foil or copper foil.

5. The method for preparing a radio frequency identification tag metal antenna pattern according to claim 1, characterized in that: The thickness of the metal foil (3) is 1-20 μm.

6. The method for preparing a radio frequency identification tag metal antenna pattern according to claim 1, characterized in that: The low-adhesion adhesive layer (5) is a high-flexibility silicone layer or a high-flexibility acrylic adhesive layer.

7. The method for preparing a radio frequency identification tag metal antenna pattern according to claim 1, characterized in that: The laser cutting module further comprises: a laser generator, a light splitting unit and a galvanometer scanning unit.

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