Paper RFID card manufacturing method and paper RFID card

Abstract

A paper RFID card manufacturing method and a paper RFID card belong to the technical field of RFID cards, and the paper RFID card manufacturing method is characterized by comprising the following steps: constructing a front printing layer material; constructing a middle layer material; constructing a reverse printing layer material, and constructing an RFID tag structure on the reverse printing layer material to obtain a first composite material; a middle layer material is composited on the first composite material, a composite layer material is obtained, and the RFID tag structure is located between the reverse printing layer material and the middle layer material; and compounding a front printing layer material on the composite layer material to obtain the paper RFID card. According to the application, the RFID tag structure is directly arranged on the reverse printing layer, so that the problem of poor recoverability caused by the fact that the RFID tag uses PET as an electronic tag layer base material is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of RFID cards, and in particular relates to a method for manufacturing a paper RFID card and a paper RFID card. Background Art

[0002] RFID card is a contactless automatic identification card based on RFID technology. It is generally equipped with an RFID tag inside. The RFID tag generally includes a substrate and an antenna and chip set on the substrate. The substrate is generally made of PET and is used to communicate with the reader. Its core lies in a highly secure and encryptable integrated circuit chip, which ensures the uniqueness and security of the RFID card.

[0003] For example, Chinese patent publication number CN206258897U discloses an RFID tag comprising, from top to bottom, a printed layer, an upper protective layer, an electronic tag layer, a lower protective layer, and a backing paper layer. The electronic tag layer comprises a flexible substrate, an antenna disposed on the flexible substrate, and an integrated chip disposed on the flexible substrate. The antenna and the integrated chip are electrically connected. The upper protective layer is provided with an upper notch corresponding to the position of the integrated chip, and the projection of the integrated chip on the flexible substrate is located within the projection of the upper notch on the flexible substrate. The lower protective layer is provided with a lower notch corresponding to the position of the integrated chip, and the projection of the integrated chip on the flexible substrate is located within the projection of the lower notch on the flexible substrate. The lower protective layer and the backing paper layer are bonded together with a self-adhesive adhesive. This advantageous feature is that the upper and lower protective layers can position the integrated chip within the upper and lower notches. When the RFID tag is subjected to pressure, the upper and lower protective layers provide adequate cushioning for the integrated chip, preventing it from being crushed.

[0004] Currently, the national standard GB / T43588-2023, "Methods for evaluating the recyclability of paper, paperboard and paper products", describes two evaluation methods for the recyclability of paper, paperboard and paper products, which are applicable to paper, paperboard and paper products. Among them, Method B is applicable to printed or unprinted paper, paperboard and paper products. It evaluates the recyclability of the sample based on the results of the screening residue rate measurement and the results of the hand sheet viscosity test and optical uniformity observation.

[0005] However, traditional RFID tags typically use polyethylene terephthalate (PET) as the substrate for the electronic tag layer. This material provides high strength and flexibility. However, most current PET products are generally disposed of through landfill or incineration and have poor recyclability.

[0006] Therefore, there is an urgent need to develop a method for manufacturing a paper RFID card and a paper RFID card to solve the problems in the prior art. Summary of the Invention

[0007] The present invention aims to provide a method for manufacturing a paper RFID card and a paper RFID card. By directly placing the RFID tag structure on the reverse printed layer material, the problem of poor recyclability caused by the use of PET as the electronic tag layer substrate of the RFID tag mentioned in the above background art is solved.

[0008] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0009] A method for manufacturing a paper RFID card comprises the following steps:

[0010] Constructing the front printing layer material;

[0011] constructing the middle layer material;

[0012] Constructing a reverse printing layer material, wherein the reverse printing layer material includes a reverse rolled paper material and an RFID tag structure constructed on the reverse printing layer material;

[0013] Compounding a reverse printing layer material and an intermediate layer material to obtain a composite layer material, wherein the RFID tag structure is located between the reverse printing layer material and the intermediate layer material;

[0014] The composite layer material and the front printing layer material are combined to obtain a paper RFID card.

[0015] Furthermore, the method of constructing the reverse printed layer material, wherein the reverse printed layer material includes a reverse rolled paper material and an RFID tag structure constructed on the reverse printed layer material, includes the following steps:

[0016] Pre-dry the reverse side of the rolled paper material;

[0017] Printing an antenna on the reverse side of the rolled paper material;

[0018] Installing an RFID chip on the antenna to obtain a reverse printing layer material;

[0019] The method of printing an antenna on the reverse side of the rolled paper material comprises the following steps:

[0020] Make silk screen printing screens;

[0021] Making conductive pulp;

[0022] Rolling the conductive pulp and performing fineness test and viscosity test on the conductive pulp to obtain qualified pulp;

[0023] Use qualified paste to screen print antennas;

[0024] Drying the reverse side of the rolled paper material;

[0025] Screen-printed insulating varnish, which is used to prevent bridge short circuits;

[0026] Screen printing connecting silver paste, the connecting silver paste is used for crossing the bridge.

[0027] Furthermore, the qualified slurry meets the following conditions:

[0028] When the qualified slurry is mixed with organic varnish at a ratio of 1:2 and stirred evenly, the fineness is less than or equal to 20μm;

[0029] When the temperature of qualified slurry is adjusted to 25℃, the construction viscosity is ±2000mPa·s.

[0030] Furthermore, the construction of the intermediate layer material comprises the following steps:

[0031] Pre-dry the entire roll of the middle layer material;

[0032] Making hot melt adhesive;

[0033] Applying hot melt adhesive to one surface of the middle layer material roll;

[0034] Laminating the base paper with the surface of the middle layer material roll coated with hot melt adhesive to obtain the middle layer material;

[0035] The hot melt adhesive is made of a rubber-based hot melt adhesive, and the base paper is made of a paper material coated with silicone oil on one side.

[0036] Furthermore, the structural intermediate layer material further comprises:

[0037] Construct avoidance holes in the middle layer material.

[0038] Furthermore, the construction of the front printed layer material comprises the following steps:

[0039] The front printing layer paper material is compounded with the laser film through water-based glue to obtain the front printing layer material.

[0040] Furthermore, the composite back printing layer material and the intermediate layer material are composited to obtain a composite layer material, comprising the following steps:

[0041] Peel off the backing paper of the middle layer material;

[0042] Laminating the hot melt adhesive side of the middle layer material with the RFID tag structure side of the reverse printed layer material;

[0043] The composite material is cut into sheets to obtain a composite layer material.

[0044] Furthermore, the composite layer material and the front printed layer material are combined to obtain a paper RFID card, which includes the following steps:

[0045] Make wallpaper glue;

[0046] Laminating the composite layer material and the front printing layer material;

[0047] Dehumidify and pressurize the laminated materials;

[0048] The material after dehumidification and pressure maintenance is trimmed to obtain a paper RFID card.

[0049] Furthermore, the composite back printing layer material and the intermediate layer material are composited to obtain a composite layer material, further comprising the following steps:

[0050] The composite material after cutting and stretching is dehumidified and pressurized, wherein the pressure of the pressurization is 0.5Mpa-0.9Mpa, the humidity is controlled at 30%-55%, and the pressurization time is greater than 48h;

[0051] The composite material after dehumidification and pressure maintenance is returned to water to make the moisture content of the composite material 6%.

[0052] A paper RFID card includes a front printed layer, a middle layer, and a back printed layer, wherein the back printed layer includes an RFID tag structure, and the construction of the RFID tag structure includes the following steps:

[0053] Pre-dry the reverse side of the rolled paper material;

[0054] Printing an antenna on the reverse side of the rolled paper material;

[0055] Installing an RFID chip on the antenna to obtain a reverse printing layer material;

[0056] The method of printing an antenna on the reverse side of the rolled paper material comprises the following steps:

[0057] Make silk screen printing screens;

[0058] Making conductive pulp;

[0059] Rolling the conductive pulp and performing fineness test and viscosity test on the conductive pulp to obtain qualified pulp;

[0060] Use qualified paste to screen print antennas;

[0061] Drying the reverse side of the rolled paper material;

[0062] Screen-printed insulating varnish, wherein the insulating varnish is used to prevent bridge short circuits;

[0063] Screen printing connecting silver paste, wherein the connecting silver paste is used for crossing bridges.

[0064] The present invention has the following advantages:

[0065] (1) The reverse printed layer material of the present application includes a reverse rolled paper material and an RFID tag structure constructed on the reverse printed layer material; the reverse printed layer of the paper RFID card replaces the substrate of the electronic tag layer, removes the substrate of the electronic tag layer, and reduces the thickness of the paper RFID card; at the same time, the electronic tag layer is omitted, which can avoid the need to set an adhesive layer between the electronic tag layer and the intermediate layer or the front printed layer, further reducing the thickness of the paper RFID card.

[0066] (2) This application uses a pressure of 0.5Mpa-0.9Mpa and a humidity of 30%-55% to dehumidify and maintain the pressure of the composite layer material after being cut into sheets, which is more conducive to the composite layer material after the roll-to-roll process is changed to the sheet process and the front printed layer material of the sheet process. The combination effect is good, the flatness of the prepared paper RFID card is improved, and the durability of the paper RFID card is improved.

[0067] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 It is a schematic diagram of the overall process of the present invention;

[0069] Figure 2 This is a test result diagram of the screening rate of the present invention;

[0070] Figure 3 This is a picture of the sieve residue after the sieve residue rate test of the present invention;

[0071] Figure 4 This is a graph showing the viscosity test results of the handsheet of the present invention;

[0072] Figure 5 This is a physical picture of the handsheet after the viscosity test of the handsheet of the present invention;

[0073] Figure 6 This is a graph showing the optical uniformity of the handsheet of the present invention. DETAILED DESCRIPTION

[0074] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0075] Paper RFID card manufacturing method, such as Figure 1 As shown, the following steps are included:

[0076] S1: construct the front printing layer material;

[0077] S2: construct the middle layer material;

[0078] S3: constructing a reverse printing layer material, wherein the reverse printing layer material includes a reverse rolled paper material and an RFID tag structure constructed on the reverse printing layer material;

[0079] S4: Compounding the reverse printing layer material and the intermediate layer material to obtain a composite layer material, wherein the RFID tag structure is located between the reverse printing layer material and the intermediate layer material;

[0080] S5: Compounding the composite layer material and the front printing layer material to obtain a paper RFID card.

[0081] In this embodiment, the RFID tag structure is a substrate-less RFID tag, comprising an RFID chip and an antenna connected to the RFID chip. Optionally, the RFID tag structure also includes a single-sided bridge region to prevent perforation of the reverse printed layer, thereby ensuring the integrity of the reverse printed layer.

[0082] The present application constructs the RFID tag structure on the reverse printed layer material, and replaces the substrate of the electronic tag layer with the reverse printed layer material, thereby removing the substrate of the electronic tag layer and reducing the thickness of the paper RFID card. At the same time, the RFID tag structure is set on the reverse printed layer material, eliminating the electronic tag layer, avoiding the need for an adhesive layer between the electronic tag layer and the intermediate layer material or the front printed layer material, and further reducing the thickness of the paper RFID card.

[0083] The step S1 of constructing the front printing layer material includes the following steps:

[0084] The front printing layer paper material is compounded with the laser film through water-based glue to obtain the front printing layer material.

[0085] Specifically, the steps include:

[0086] Apply a layer of water-based glue on the surface of the laser film; the water-based glue is applied by a 200-line anilox roller and dried with hot air;

[0087] When the glue is half dry, it is hot pressed with the paper material through the pressing roller to form coated paper;

[0088] Rolling up;

[0089] In this embodiment, the aging is carried out in an environment of 40° C. for 48 hours.

[0090] In this embodiment, the front printing layer material can be obtained using existing technologies and is a common material in the printing and packaging field, so this application will not elaborate on it in detail. The water-based glue does not contain environmentally harmful organic solvents, has low VOC emissions, and is more environmentally friendly. The purpose of curing is to fully volatilize the solvent in the glue, thereby ensuring a stronger bond between the paper and the laser film.

[0091] The front printing layer material is a flat sheet of paper composited with a laser film, and the size of the front printing layer material is adapted to that of the composite layer material.

[0092] The step S2 of constructing the intermediate layer material comprises the following steps:

[0093] S21: pre-drying the entire roll of the middle layer material;

[0094] In this embodiment, the intermediate layer material roll is placed in a pre-drying machine and passed through a hot air drying tunnel, wherein the drying condition is 95° C. for 2 minutes. The material of the intermediate layer material roll is paper.

[0095] S22: making hot melt adhesive;

[0096] Add polybutadiene rubber particles and toluene solvent to a reaction kettle and heat to 60°C. Stir and dissolve for 2 hours. Once fully dissolved, add acrylic acid monomer and carboxyl monomer. Raise the temperature to 65°C and add an initiator. When the viscosity of the system increases significantly, slowly cool to room temperature to obtain a grafted rubber-based hot melt adhesive material.

[0097] S23: applying hot melt adhesive to one surface of the middle layer material roll;

[0098] A serial coating and laminating integrated device is used to complete coating and laminating online. In this embodiment, coating is performed by a 170-line anilox steel roller. Hot air drying is performed at 150° C. for 30 seconds.

[0099] S24: Laminating the base paper and the surface of the intermediate layer material roll coated with hot melt adhesive to obtain the intermediate layer material;

[0100] In this embodiment, the base paper is made of a paper material coated with silicone oil on one side, such as glassine paper. The silicone oil layer makes its surface energy very low, so that the glue layer remains entirely on the middle layer material after the base paper is peeled off.

[0101] S25: constructing an avoidance hole on the middle layer material, wherein the avoidance hole is used to avoid the RFID chip or the bridge area on the reverse printed layer material, wherein the bridge area is the area including the insulating varnish and the connecting silver paste.

[0102] The present application improves the environmental friendliness of the RFID card compared to the existing self-adhesive layer by constructing a layer of hot melt adhesive on the middle layer material roll and a composite base paper on the hot melt adhesive.

[0103] The construction of the reverse printing layer material in S3 includes the following steps:

[0104] S31: pre-drying the reverse side of the rolled paper material;

[0105] The rolled paper material is placed in a pre-dryer and slowly passes through an infrared hot air drying tunnel at a low speed. In this embodiment, the drying condition is 80° C. for 10 minutes.

[0106] S32: Printing an antenna on the reverse side of the rolled paper material. In this embodiment, the antenna is a high-frequency antenna and adopts a single-sided bridge process.

[0107] S33: Installing an RFID chip on the antenna to obtain a reverse printing layer material.

[0108] S34: Rewind the reverse printing layer material.

[0109] The step S32 of printing an antenna on the reverse side of the rolled paper material includes the following steps:

[0110] S321: Making a silk screen printing screen; in this embodiment, the silk screen printing screen is a 250-300 mesh polyester teflon screen plate, and the antenna shape is 60 mm×30 mm.

[0111] S322: preparing conductive pulp;

[0112] The flaky silver paste, spherical silver paste and organic varnish were mixed in a ratio of 15-30:30-40:30-55, pre-stirred at a speed of 500 rpm for 10 min, and then stirred at a speed of 900 rpm-1500 rpm for 30 min to obtain a coarse silver paste.

[0113] S323: rolling the conductive crude pulp and performing a fineness test and a viscosity test on the conductive crude pulp to obtain a qualified pulp.

[0114] In this embodiment, the conductive pulp in S33 is rolled by a three-roll mill, and the parameters of the three-roll mill are shown in Table 1 below.

[0115] Table 1: Parameters of the three-roll mill in this embodiment.

[0116]

[0117] The unit for the 1 / 2 roller spacing is μm, the unit for the 2 / 3 roller spacing is μm, and the unit for roller speed is rpm. During the first roller pass, the coarse slurry must be free of dry powder. Double scrapers are used to prevent the metal scrapers from contacting the rollers. During the fourth roller pass, a fineness test and / or viscosity test can be performed. If the fineness test during the fourth roller pass is qualified, the fifth roller pass can be omitted.

[0118] In this embodiment, the fineness test includes the following:

[0119] The slurry to be tested is mixed with organic varnish at a ratio of 1:2. After stirring evenly, the fineness is tested using a scraper fineness meter. The fineness is required to be ≤20μm.

[0120] The viscosity detection includes the following:

[0121] Adjust the temperature of the slurry to be tested to 25°C and measure the viscosity using a rotational viscometer. The construction viscosity is required to be ±2000mPa·s. If the viscosity is too high, it can be adjusted by adding a small amount of diluent until the viscosity is qualified. Among them, the diluent is recommended to be added gradually at 0.5% of the total amount.

[0122] S324: Screen-printing an antenna using the qualified paste tested in S323.

[0123] In this embodiment, the screen printing is performed by a screen printing machine, specifically, a polyurethane scraper is used for scraping once. The antenna is a high frequency antenna, which adopts a single-sided bridge process.

[0124] S325: Drying the reverse side of the rolled paper material. In this embodiment, the paper material is dried with hot air at 140° C. for 30 minutes.

[0125] S326: Screen printing insulating varnish, wherein the insulating varnish is used to prevent bridge short circuit.

[0126] S327: Screen-printing connecting silver paste, which is used as a bridge to connect the ends of the antenna.

[0127] S326 and S327 are used to achieve a single-sided bridge, avoiding perforation of the reverse printed layer and ensuring the integrity of the reverse printed layer. This embodiment utilizes these steps to print an environmentally friendly, high-quality antenna on the reverse rolled paper material, achieving high reliability. Specifically, S326 and S327 can be referenced from existing technologies and will not be further elaborated in this application.

[0128] S33 installs the RFID chip on the antenna and uses a high-precision Flipchip placement machine to pressure-weld the RFID chip to the antenna. This is a conventional process and includes loading, gluing, chip pre-bonding, hot-press bonding, and testing. The test involves checking the functionality of the packaged RFID using a reader system. Failure to read the chip is considered unqualified and marked with an ink dot. In this embodiment, the technology for installing the RFID chip on the antenna is conventional and will not be further described in this application.

[0129] This invention eliminates the two major steps of forming the self-adhesive label and applying the label in existing RFID tag production, optimizing the product process, improving production efficiency, avoiding unnecessary waste, reducing the production process, saving materials, and being more environmentally friendly. Furthermore, while existing RFID card production requires all RFID-related processes to be completed within the RFID tag layer, this invention implements coding after multi-layer lamination, connecting the RFID and packaging industries and placing coding later in the process, helping to reduce scrap rates.

[0130] The step S34 of rolling up the reverse printed layer material includes the following steps:

[0131] The paper material bound to the chip is wound and reeled together with the narrow paper used for isolation. Each small roll of narrow paper corresponds to a row of antennas, isolating the chip protrusions and preventing scratches on the paper material.

[0132] The S4 composite back printing layer material and the intermediate layer material to obtain a composite layer material comprises the following steps:

[0133] S41: Peeling off the bottom paper of the middle layer material and the narrow paper on the reverse printed layer material;

[0134] S42: Laminating the side of the middle layer material with the hot melt adhesive and the side of the reverse printed layer material with the RFID tag structure;

[0135] S43: Cutting the composite material into sheets to obtain composite layer materials; wherein one of the composite layer materials includes at least one RFID tag structure;

[0136] S44: Dehumidifying and holding the composite material after being cut and stretched, wherein the holding pressure is 0.5Mpa-0.9Mpa, the humidity is controlled at 30%-55%, and the holding time is greater than 48 hours.

[0137] S45: After dehumidification and pressure holding, the composite material is returned to water, controlling the moisture content to 6%. This step is used to restore the moisture content of the paper material. The appropriate moisture content can ensure that the fibers and seasonings inside the paper are tightly bonded, the paper has good elasticity, and can better release the internal stress caused by pressure holding.

[0138] The national standard GB / T22896-2008, "Paper and paperboard - Determination of curl using a single vertically suspended specimen," specifies the method for measuring paper curl using a vertically suspended specimen. During cutting and measurement, the specimen must be exposed to a constant environment for a certain period of time after curling occurs. A comparison of curl before and after dehumidification and pressure retention is shown in Table 2.

[0139] Table 2: Comparison of curl before and after dehumidification and pressure retention.

[0140]

[0141] The unit of the curl degree is cm.

[0142] As can be seen from the data in Table 2, the curl of the composite material is greatly reduced after dehumidification and pressure maintenance. Lower curl significantly improves the stability of post-processing such as mounting and printing.

[0143] In this embodiment, the side of the intermediate layer material with hot melt adhesive and the side of the reverse printed layer material with RFID tag structure are laminated, and roll-to-roll lamination is achieved by an existing laminating machine with CCD visual recognition and automatic deviation correction; wherein, the chip size is approximately 0.65mm×0.6mm, the accuracy is ±1mm, and a circular hole with a diameter of 3mm is obtained after punching in S2.

[0144] Roll-to-roll lamination using a laminating machine with CCD visual recognition and automatic deviation correction includes the following steps:

[0145] The middle layer material is placed at the unwinding position A, close to the two deflection-correcting shafts controlled by the dual servo motors of the laminator; the reverse printing layer material is placed at the unwinding position B, which is closer to the rewinding position.

[0146] Peeling and laminating: The middle layer material passes through the separation roller of the laminating machine to separate the backing paper, and the backing paper is rolled up as waste material; the adhesive side of the middle layer material faces upward and is laminated with the reverse printed layer material through the pressing roller, and the pressure of the pressing roller is controlled to ensure smooth lamination without bubbles or creases; the winding tension is controlled to ensure the winding edge is flush.

[0147] Sheet cutting: Place the stripped and laminated material on the unwinding mechanism of the roll-to-roll die-cutting machine, pass through the transmission roller and reach the pneumatically controlled guillotine position. The guillotine is linked to the transmission device and can accurately control the cut length according to the set transmission speed.

[0148] The S5 composite layer material and the front printing layer material are combined to obtain a paper RFID card, including the following steps:

[0149] A mounting process is adopted to composite the composite layer material and the front printing layer material, wherein mounting glue is provided on the front printing layer material to prevent the glue from overflowing from the edge.

[0150] Specifically, the steps include:

[0151] S51: Making wallpaper glue;

[0152] In this embodiment, acrylic acid, acrylic ester, and trans-butenoic acid are used as raw materials to react to obtain a water-soluble resin polymer, and bio-based polyurethane dispersion, acrylic ester, and vinyl acetate are used as raw materials to emulsify to obtain a polyurethane dispersion and acrylic ester mixture, which is added dropwise to the water-soluble resin polymer to obtain white latex after the reaction; the viscosity of the emulsion at this time is relatively low and is not suitable for equipment such as mounting machines, so rosin resin thickening emulsion, water, dispersant, moisturizer, and defoaming agent are added to the white latex, and the mixture is stirred evenly to obtain wallpaper glue.

[0153] S52: Mounting and laminating;

[0154] In this embodiment, the described mounting and laminating is carried out using a flat-sheet laminating machine, so that the paper surface (non-film surface) of the front printed layer material faces upward and is coated with glue; it is conveyed to the laminating platform through a conveyor, and at this time a robot with a suction cup picks up the composite layer material, locates the position of the front printed layer material through visual positioning, and the robot presses down to complete the laminating action.

[0155] S53: Dehumidification and pressure maintenance;

[0156] Since the moisture content of wallpaper glue D is relatively high, the materials after mounting and laminating need to be dehumidified and pressurized again. The specific requirements are the same as those in S44.

[0157] S54: trimming;

[0158] Since there are size differences in the layer materials after step S53, the shape needs to be trimmed by a paper cutter. Based on the size of the front printing layer material, each side is shrunk inward by 1mm-5mm. The material is placed horizontally, and the shear is perpendicular to the paper surface. The paper material with the front printing layer material, the middle layer material, and the back printing layer material composited is obtained by cutting.

[0159] A paper RFID card comprises, from top to bottom, a front printed layer, a middle layer, and a back printed layer, wherein the back printed layer comprises an RFID tag structure, and the construction of the RFID tag structure comprises the following steps:

[0160] Pre-dry the reverse side of the rolled paper material;

[0161] Printing an antenna on the reverse side of the rolled paper material;

[0162] An RFID chip is mounted on the antenna to obtain a reverse printing layer material.

[0163] The method of printing an antenna on the reverse side of the rolled paper material comprises the following steps:

[0164] Make silk screen printing screens;

[0165] Making conductive pulp;

[0166] Rolling the conductive pulp and performing fineness test and viscosity test on the conductive pulp to obtain qualified pulp;

[0167] Use qualified paste to screen print antennas;

[0168] Drying the reverse side of the rolled paper material;

[0169] Screen-printed insulating varnish, wherein the insulating varnish is used to prevent bridge short circuits;

[0170] Screen printing connecting silver paste, wherein the connecting silver paste is used for crossing bridges.

[0171] The front printing layer of the paper RFID card is made of a front printing layer material, the middle layer is made of a middle layer material, and the back printing layer is made of a back printing layer material.

[0172] In this embodiment, the front printing layer material is 235g plain laser white cardboard, and the water-based glue is Shizhuang water-based white glue XBOND-1060;

[0173] The middle layer material is 105g single-sided glossy coated paper;

[0174] The hot melt adhesive layer can be selected from Avery hot melt adhesive film Fsaaon-HP104;

[0175] The conductive paste of the RFID tag structure can be Harbin conductive paste JL-Y-CL-120-01, the chip can be Fudan Microelectronics FM13HS01-N-WTB2, and the antenna specification is 60mm×30mm;

[0176] The reverse printing layer material is 170g white cardboard.

[0177] The national standard GB / T43588-2023, "Methods for Evaluating the Recyclability of Paper, Paperboard, and Paper Products," describes two methods for evaluating the recyclability of paper products. Method B is applicable to both printed and unprinted paper products. Recyclability refers to the ability of paper, paperboard, and paper products to be effectively recycled and used to produce certain grades of paper, paperboard, and paper products based on common recycling standards and processes.

[0178] Method B in the national standard GB / T43588-2023 uses three criteria to evaluate recyclability: screening residue rate, handsheet viscosity test, and optical uniformity. The specific criteria are shown in Table 3.

[0179] Table 3: Recyclability evaluation criteria for Method B in GB / T43588-2023.

[0180]

[0181] Table 3 details the recyclability evaluation criteria for reject ratio, handsheet viscosity test, and optical uniformity, along with the corresponding recyclability evaluation results. If any one of the evaluations in Table 3 is limited recyclable or non-recyclable, that result represents the corresponding evaluation. For example, if reject ratio is recyclable, viscosity is recyclable, and optical uniformity is limited recyclable, the overall evaluation is limited recyclable.

[0182] like Figures 2 to 6 , is the recyclability evaluation result of three paper RFID card samples in this application. Among them, Figure 2 This is a test result of the rejection rate of the present invention. It can be seen that the paper RFID card of this application is recyclable in the rejection rate project; Figure 3 This is a picture of the sieve residue after the sieve residue rate test of the present invention; Figure 4 This is a graph showing the results of the handsheet viscosity test of the present invention. It can be seen that the paper RFID card of the present application is recyclable in the handsheet viscosity test; Figure 5 This is a photo of the handsheet after the viscosity test of the handsheet of the present invention, which can also be used to observe the optical uniformity of the handsheet; Figure 6 This is a graph showing the optical uniformity test results of the handsheet of the present invention. It can be seen that the paper RFID card of the present application is limitedly recyclable in the optical uniformity evaluation.

[0183] Therefore, the overall evaluation of the paper RFID card of this application is limited recyclability.

[0184] In summary, this application has the following beneficial effects:

[0185] (1) The reverse printed layer of the paper RFID card replaces the substrate of the electronic tag layer, thereby removing the electronic tag layer and reducing the thickness of the paper RFID card. At the same time, by eliminating the electronic tag layer, it is possible to avoid setting a glue layer between the electronic tag layer and the middle layer or the front printed layer. This not only reduces the materials and processes, but also makes the overall thickness more uniform, making the produced card smoother and improving the overall grade of the card.

[0186] (2) The RFID industry is mainly based on roll-to-roll manufacturing, while the printing industry is mainly based on sheet manufacturing. In the process of the present invention, the first half is roll-to-roll manufacturing, and the second half switches to sheet manufacturing. During the roll-to-sheet cutting process, the different fiber distribution directions of the paper, the differences between the components, or the uneven tension on the front and back surfaces during equipment operation and the uneven shrinkage caused by drying will inevitably cause the paper to warp too much. The present invention fully considers and specifically solves the problem of poor connection between the two types of processes in the RFID industry and the printing industry. It adopts a production method that combines roll-to-roll technology with sheet technology. After the roll is cut flat, a process of dehumidification, pressure maintenance and water return is introduced. External force is applied during the process of water loss and water return of the paper, making the sheet smoother. The lower warpage greatly improves the adaptability of the mounting and printing machine, and solves the problem of high defective rate of mounting and printing in the later stage caused by paper warping.

[0187] (3) The materials prepared by the method of the present application are tested for their recyclability, and the results show that they are limitedly recyclable with recycling value and are green and environmentally friendly.

[0188] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for manufacturing a paper RFID card, characterized in that: The steps include: Constructing the front printing layer material; constructing the middle layer material; Constructing a reverse printing layer material, wherein the reverse printing layer material comprises a reverse rolled paper material and an RFID tag structure constructed on the reverse printing layer material; Compounding a back printing layer material and an intermediate layer material to obtain a composite layer material, wherein the RFID tag structure is located between the back printing layer material and the intermediate layer material; The composite layer material and the front printing layer material are combined to obtain a paper RFID card.

2. The method for manufacturing a paper RFID card according to claim 1, characterized in that: The method of constructing the reverse printed layer material, wherein the reverse printed layer material includes a reverse rolled paper material and an RFID tag structure constructed on the reverse printed layer material, comprises the following steps: Pre-dry the reverse side of the rolled paper material; Printing an antenna on the reverse side of the roll paper material; Installing an RFID chip on the antenna to obtain a reverse printed layer material; The method of printing an antenna on the reverse side of the rolled paper material comprises the following steps: Making conductive pulp; Rolling the conductive pulp, and performing fineness test and viscosity test on the conductive pulp to obtain qualified pulp; Use qualified paste to screen print antenna; Drying the reverse side of the rolled paper material; Screen-printed insulating varnish, the insulating varnish is used to prevent bridge short circuit; The screen-printed silver connection paste is used for the bridge.

3. The method for manufacturing a paper RFID card according to claim 2, characterized in that: The qualified slurry meets the following conditions: When the qualified slurry is mixed with the organic varnish at a ratio of 1:2 and stirred evenly, the fineness is less than or equal to 20μm; When the temperature of qualified slurry is adjusted to 25°C, the construction viscosity is ±2000mPa·s.

4. The method for manufacturing a paper RFID card according to any one of claims 1 to 3, characterized in that: The method of constructing the intermediate layer material comprises the following steps: Pre-dry the entire roll of the middle layer material; Making hot melt adhesive; Applying hot melt adhesive to one surface of the middle layer material roll; Compounding the base paper with the surface of the intermediate layer material roll coated with hot melt adhesive to obtain the intermediate layer material; The material of the hot melt adhesive is a rubber-based hot melt adhesive material, and the material of the base paper is a paper material coated with silicone oil on one side.

5. The method for manufacturing a paper RFID card according to claim 4, characterized in that: The structural intermediate layer material further comprises: The avoidance holes are formed in the middle layer material.

6. The method for manufacturing a paper RFID card according to claim 4, characterized in that: The method of constructing the front printed layer material comprises the following steps: The front printing layer paper material is compounded with the laser film through water-based glue to obtain the front printing layer material.

7. The method for manufacturing a paper RFID card according to claim 5, characterized in that: The composite back printing layer material and the intermediate layer material are composited to obtain the composite layer material, comprising the following steps: Peel off the backing paper of the middle layer material; Laminating the side of the middle layer material with the hot melt adhesive with the side of the reverse printed layer material with the RFID tag structure; The composite material is cut into sheets to obtain a composite layer material.

8. The method for manufacturing a paper RFID card according to claim 7, characterized in that: The composite layer material and the front printing layer material are composited to obtain a paper RFID card, which includes the following steps: Making wallpaper glue; Laminating the composite layer material and the front printed layer material; Dehumidify and pressurize the laminated materials; The material after dehumidification and pressure maintenance is trimmed to obtain a paper RFID card; Wherein, the front printing layer material is a flat sheet of paper.

9. The method for manufacturing a paper RFID card according to claim 7 or 8, characterized in that: The composite back printing layer material and the intermediate layer material are composited to obtain the composite layer material, further comprising the following steps: The composite material after cutting is dehumidified and pressurized, wherein the pressure of the pressurization is 0.5Mpa-0.9Mpa, the humidity is controlled at 30%-55%, and the pressurization time is greater than 48h; The composite material after dehumidification and pressure maintenance is returned to water to make the moisture content of the composite material 6%.

10. A paper RFID card, characterized in that: The invention comprises a front printing layer, an intermediate layer and a back printing layer, wherein the back printing layer comprises an RFID tag structure, and the construction of the RFID tag structure comprises the following steps: Pre-dry the reverse side of the rolled paper material; Printing an antenna on the reverse side of the roll paper material; Installing an RFID chip on the antenna to obtain a reverse printed layer material; The method of printing an antenna on the reverse side of the rolled paper material comprises the following steps: Making conductive pulp; Rolling the conductive pulp, and performing fineness test and viscosity test on the conductive pulp to obtain qualified pulp; Use qualified paste to screen print antenna; Drying the reverse side of the rolled paper material; Screen-printed insulating varnish, wherein the insulating varnish is used to prevent bridge short circuit; Screen printing connecting silver paste, wherein the connecting silver paste is used for bridging.

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