Paper RFID Card Manufacturing Method and Paper RFID Card

Abstract

A manufacturing method of a paper RFID card and the paper RFID card belong to the technical field of RFID cards. A manufacturing method of a paper RFID card is characterized by comprising the following steps: constructing a front printing layer material; constructing an intermediate layer material; constructing a back printing layer material and constructing an RFID tag structure on the back printing layer material to obtain a first composite material; laminating the intermediate layer material on the first composite 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; laminating the front printing layer material on the composite layer material to obtain a paper RFID card. This application directly sets the RFID tag structure on the back printing layer to solve the problem of poor recyclability caused by using PET as the base material of the electronic tag layer for the RFID tag.

Description

Technical Field

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

[0002] An RFID card is a non-contact automatic identification card based on RFID technology. Generally, an RFID tag is provided inside it. Among them, the RFID tag generally includes a substrate, an antenna and a chip provided on the substrate. The material of the substrate is generally PET, which is used to communicate with a reader. The core lies in having a highly secure and encryptable integrated circuit chip, ensuring the uniqueness and security of the RFID card.

[0003] For example, Chinese Patent with publication number CN206258897U discloses an RFID tag, which includes a printing layer, an upper protective layer, an electronic tag layer, a lower protective layer and a backing paper layer arranged in sequence from top to bottom; the electronic tag layer includes a flexible substrate, an antenna provided on the flexible substrate and an integrated chip provided on the flexible substrate; the antenna and the integrated chip are electrically connected; an upper notch corresponding to the position of the integrated chip is provided on the upper protective layer, and the projection of the integrated chip on the flexible substrate is located within the projection of the upper notch on the flexible substrate; a lower notch corresponding to the position of the integrated chip is provided on the lower protective layer, 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 by an adhesive. Its advantage is that the upper protective layer and the lower protective layer can make the integrated chip located in the upper notch and the lower notch. When the RFID tag is pressed, the upper protective layer and the lower protective layer can provide appropriate buffering for the integrated chip, and the integrated chip is not easily damaged.

[0004] At present, the national standard "Evaluation Method for Recyclability of Paper, Board and Paper Products" with standard number GB / T43588 - 2023 describes two evaluation methods for the recyclability of paper, board and paper products, which are applicable to paper, board and paper products. Among them, Method B is applicable to printed or unprinted paper, board and paper products. It evaluates the recyclability of the sample according to the measurement results of the sieve residue rate and the observation results of the stickiness test and optical uniformity of the hand sheet.

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

[0006] Therefore, it is urgent to develop a manufacturing method of paper RFID cards and paper RFID cards to solve the problems in the prior art. Summary of the Invention

[0007] The object of the present invention is to provide a method for manufacturing a paper RFID card and a paper RFID card. By directly setting the RFID tag structure on the reverse printing layer material, the problem of poor recyclability caused by using PET as the base material of the electronic tag layer in the RFID tag in the above-mentioned background technology is solved.

[0008] 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, comprising the following steps:

[0010] Construct the front printing layer material;

[0011] Construct the intermediate layer material;

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

[0013] Compound 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;

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

[0015] Further, the construction of the reverse printing layer material, wherein the reverse printing layer material includes a reverse roll paper material and an RFID tag structure constructed on the reverse printing layer material, includes the following steps:

[0016] Pre-dry the reverse roll paper material;

[0017] Print an antenna on the reverse roll paper material;

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

[0019] The printing of the antenna on the reverse roll paper material includes the following steps:

[0020] Make a screen printing stencil;

[0021] Make a conductive thick paste;

[0022] Roll the conductive thick paste and perform fineness testing and viscosity testing on the conductive thick paste to obtain a qualified paste;

[0023] Use the qualified paste for screen printing the antenna;

[0024] Dry the reverse roll paper material;

[0025] Screen printing insulating varnish, which is used to prevent short - circuit across the bridge;

[0026] Screen printing connecting silver paste, which is used for bridging across 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 the qualified slurry is adjusted to 25°C, the construction viscosity is ±2000mPa·s.

[0030] Furthermore, the steps for constructing the intermediate layer material include the following:

[0031] Perform full - roll pre - drying on the intermediate layer material roll;

[0032] Produce hot - melt adhesive;

[0033] Coat the hot - melt adhesive on one surface of the intermediate layer material roll;

[0034] Compound the base paper with the surface of the intermediate layer material roll coated with hot - melt adhesive to obtain the intermediate layer material;

[0035] Among them, 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 with one - side silicone oil coating.

[0036] Furthermore, the construction of the intermediate layer material also includes:

[0037] Construct avoidance holes on the intermediate layer material.

[0038] Furthermore, the steps for constructing the front - side printing layer material include the following:

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

[0040] Furthermore, the steps for compounding the reverse - side printing layer material and the intermediate layer material to obtain the composite layer material include the following:

[0041] Peel off the base paper of the intermediate layer material;

[0042] Compound the side with hot - melt adhesive on the intermediate layer material with the side with RFID tag structure on the reverse - side printing layer material;

[0043] Cut the compounded material into flat sheets to obtain the composite layer material.

[0044] Furthermore, the steps for compounding the composite layer material and the front - side printing layer material to obtain the paper - based RFID card include the following:

[0045] Manufacture pasting glue;

[0046] Mount the composite layer material and the front printing layer material by pasting and laminating;

[0047] Dehumidify and press the laminated material;

[0048] Trim the dehumidified and pressed material to obtain a paper RFID card.

[0049] Furthermore, when manufacturing the composite layer material by laminating the reverse printing layer material and the intermediate layer material, the following steps are further included:

[0050] Dehumidify and press the cut flat composite layer material, wherein the pressing pressure is 0.5 Mpa - 0.9 Mpa, the humidity is controlled at 30% - 55%, and the pressing time is greater than 48 h;

[0051] Rehydrate the dehumidified and pressed composite layer material to make the moisture content of the composite layer material 6%.

[0052] A paper RFID card includes a front printing layer, an intermediate layer, and a reverse printing layer. Among them, the reverse printing layer includes an RFID tag structure, and the structure of the RFID tag structure includes the following steps:

[0053] Pre-dry the reverse coiled paper material;

[0054] Print an antenna on the reverse coiled paper material;

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

[0056] Printing the antenna on the reverse coiled paper material includes the following steps:

[0057] Manufacture a screen printing stencil;

[0058] Manufacture conductive thick paste;

[0059] Roll the conductive thick paste and perform fineness test and viscosity test on the conductive thick paste to obtain qualified paste;

[0060] Use the qualified paste to screen print the antenna;

[0061] Dry the reverse coiled paper material;

[0062] Screen print insulating varnish, wherein the insulating varnish is used to prevent bridge short circuit;

[0063] Screen print connecting silver paste, wherein the connecting silver paste is used for bridging.

[0064] The present invention has the following advantages:

[0065] (1) The reverse printing layer material of this application includes reverse roll paper material and an RFID tag structure constructed on the reverse printing layer material; such that the reverse printing layer of the paper RFID card replaces the substrate of the electronic tag layer, removing the substrate of the electronic tag layer and reducing the thickness of the paper RFID card; at the same time, the electronic tag layer is omitted, avoiding the need to set an adhesive layer between the electronic tag layer and structures such as the intermediate layer or the front printing layer, further reducing the thickness of the paper RFID card.

[0066] (2) This application subjects the cut flat composite layer material to dehumidification and pressure maintenance under a pressure of 0.5 Mpa - 0.9 Mpa and a humidity of 30% - 55%, which is more conducive to the composite of the composite layer material after changing from the roll-to-roll process to the flat sheet process with the front printing layer material of the flat sheet process. The bonding effect is good, improving the flatness of the obtained paper RFID card and enhancing the durability of the paper RFID card.

[0067] Other features and advantages of the present invention will be detailedly disclosed 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 It is a test result diagram of the residue screening rate of the present invention;

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

[0071] Figure 4 It is a test result diagram of the hand sheet viscosity of the present invention;

[0072] Figure 5 It is a physical picture of the hand sheet after the hand sheet viscosity test of the present invention;

[0073] Figure 6 It is a result diagram of the optical uniformity of the hand sheet of the present invention. Detailed Description of the Preferred Embodiments

[0074] In order to better understand the purpose, structure and function of the present invention, the following further detailed description of the present invention is made in conjunction with the drawings.

[0075] A method for manufacturing a paper RFID card, as Figure 1 shown, includes the following steps:

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

[0077] S2: Construct the intermediate layer material;

[0078] S3: Construct the reverse printing layer material, where 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: Composite the reverse printing layer material and the intermediate layer material to obtain a composite layer material, where the RFID tag structure is located between the reverse printing layer material and the intermediate layer material;

[0080] S5: Composite 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 an RFID tag without a substrate, including an RFID chip and an antenna connected to the RFID chip. Optionally, the RFID tag structure further includes a single-sided overbridge area to avoid perforating the reverse printing layer material and ensure the integrity of the reverse printing layer material.

[0082] In this application, by constructing the RFID tag structure on the reverse printing layer material and replacing the substrate of the electronic tag layer with the reverse printing layer material to remove the substrate of the electronic tag layer, the thickness of the paper RFID card is reduced; at the same time, by setting the RFID tag structure on the reverse printing layer material, the electronic tag layer is omitted, and the setting of an adhesive layer between the electronic tag layer and the intermediate layer material or the front printing layer material and other structures is avoided, further reducing the thickness of the paper RFID card.

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

[0084] Composite the front printing layer paper material with a laser film through an aqueous glue to obtain the front printing layer material.

[0085] Specifically, it includes the following steps:

[0086] Coat a layer of aqueous glue on the surface of the laser film; where the aqueous glue is coated through a 200-line screen roller and dried by hot air;

[0087] In the semi-dry state of the glue, hot-press it with the paper material through a pressure roller to form a laminated paper;

[0088] Wind it up;

[0089] Age. In this embodiment, the aging is to place it in an environment of 40 °C for 48 hours.

[0090] In this embodiment, the front printing layer material can be obtained through the prior art and is a common material in the printing and packaging field, which will not be elaborated in this application. The aqueous glue does not contain organic solvents that damage the environment, has less VOC emissions, and is more environmentally friendly; aging is to fully volatilize the solvent in the glue and make the paper material and the laser film combine more firmly.

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

[0092] The construction of the intermediate layer material in S2 includes the following steps:

[0093] S21: Pre-dry the entire roll of the intermediate layer material.

[0094] In this embodiment, the roll of the intermediate layer material is placed in a pre-dryer and passed through a hot air drying channel. Among them, the drying conditions are 95°C for 2 minutes. The material of the roll of the intermediate layer material is paper.

[0095] S22: Prepare the hot melt adhesive.

[0096] Polybutadiene rubber particles and toluene solvent are added to a reaction kettle and heated to 60°C; stirred and dissolved for 2 hours. After being fully dissolved, acrylic monomers and carboxyl monomers are added; the temperature is raised to 65°C, and an initiator is added; when the viscosity of the system increases significantly, it is slowly cooled to room temperature to obtain a graft-modified rubber-based hot melt adhesive material.

[0097] S23: Coat the hot melt adhesive on one surface of the roll of the intermediate layer material.

[0098] A series of coating and compounding integrated equipment is used to complete coating and compounding online; in this embodiment, it is coated by a 170-line anilox roller; dried by hot air, and the conditions are 150°C for 30 seconds.

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

[0100] In this embodiment, the material of the base paper is a paper material coated with silicone oil on one side, such as glassine paper. The silicone oil layer makes its surface energy very low, and is used to ensure that all the glue layer remains on the intermediate layer material after the base paper is peeled off.

[0101] S25: Construct avoidance holes on the intermediate layer material. The avoidance holes are used to avoid the RFID chip or the over-bridge area on the reverse printing layer material. Among them, the over-bridge area is an area including insulating varnish and connecting silver paste.

[0102] In this application, by constructing a layer of hot melt adhesive on the roll of the intermediate layer material and compounding the base paper on the hot melt adhesive, the environmental friendliness of the RFID card is improved compared with the existing adhesive layer.

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

[0104] S31: Pre-dry the reverse rolled paper material.

[0105] Place the rolled paper material in a pre-dryer and slowly pass it through an infrared hot air drying channel at a low speed. In this embodiment, the drying conditions are 80°C and 10 minutes.

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

[0107] S33: Install an RFID chip on the antenna to obtain the reverse printed layer material.

[0108] S34: Wind up the reverse printed layer material.

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

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

[0111] S322: Make a conductive thick paste;

[0112] Mix flaky silver paste, spherical silver paste, and organic varnish in a ratio of 15 - 30:30 - 40:30 - 55, pre-stir at a speed of 500 rpm for 10 minutes, and then stir at a speed of 900 rpm - 1500 rpm for 30 minutes to obtain a silver paste thick paste.

[0113] S323: Roll the conductive thick paste and conduct fineness test and viscosity test on the conductive thick paste to obtain a qualified paste.

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

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

[0116]

[0117] Among them, the unit of the spacing between the 1 / 2 roll is μm, the unit of the spacing between the 2 / 3 roll is μm, and the unit of the roll rotation speed is rpm. When feeding the material for the first roll rolling, there should be no dry powder in the thick paste, and a double scraper operation is used to avoid the metal scraper touching the roll. During the fourth roll rolling, fineness test and / or viscosity test can be carried out. If the fineness test during the fourth roll rolling is qualified, the fifth roll rolling can be omitted.

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

[0119] Mix the slurry to be tested with organic varnish in a ratio of 1:2, stir evenly, and then detect the fineness using a scraping fineness gauge. Among them, the fineness requirement is ≤20 μm.

[0120] The viscosity detection is as follows:

[0121] Adjust the temperature of the slurry to be measured to 25°C, and measure the viscosity using a rotational viscometer. The construction viscosity is required to be ±2000 mPa·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 step by step according to 0.5% of the total amount.

[0122] S324: Screen-print the antenna using the qualified slurry that passed the test in S323.

[0123] In this embodiment, the screen printing is carried out by a screen printing machine. Specifically, a polyurethane squeegee is used and scraped once. The antenna is a high-frequency antenna and adopts a single-sided bridging process.

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

[0125] S326: Screen-print the insulating varnish, and the insulating varnish is used to prevent short circuits in the bridge.

[0126] S327: Screen-print the connecting silver paste, and the connecting silver paste is used for the bridge to connect the head and tail of the antenna.

[0127] The above S326 and S327 are used to achieve single-sided bridging to avoid perforating the reverse printing layer material and ensure the integrity of the reverse printing layer material. Through the above steps in this embodiment, an environmentally friendly and high-quality antenna is printed on the reverse side of the rolled paper material, with high reliability. Specifically, S326 and S327 can refer to the prior art and will not be elaborated in this application.

[0128] In S33, an RFID chip is installed on the antenna, and the RFID chip is pressure-welded and connected to the antenna through a high-precision Flipchip mounter, which is the prior art and includes: loading, gluing, chip pre-bonding, chip thermocompression bonding, and testing. Among them, the testing is to check the RFID function after encapsulation through a reader system, and a read failure is regarded as unqualified and marked with an ink dot. In this embodiment, the technology of installing the RFID chip on the antenna is the prior art and will not be elaborated in this application.

[0129] The present invention omits the two major steps of making the existing RFID tag layer into a self-adhesive label and labeling, optimizes the product process, improves production efficiency, avoids unnecessary waste, reduces the production process, saves materials, and is more green and environmentally friendly. At the same time, when the existing RFID cards are made, all processes related to the RFID industry need to be completed in the RFID tag layer. However, in this application, after multi-layer lamination, the RFID industry and the printing and packaging industry are connected in series, and the coding is placed in a later process, which helps to reduce the scrap rate.

[0130] For the reverse printing layer material of the S34 winding, the following steps are included:

[0131] The paper material with the chip bound is wound together with the narrow paper used for isolation. Among them, each small roll of narrow paper corresponds to one column of antennas to separate the chip protrusions and prevent scratching of the paper material.

[0132] For the S4 composite reverse printing layer material and the intermediate layer material to obtain the composite layer material, the following steps are included:

[0133] S41: Peel off the base paper of the intermediate layer material and the narrow paper on the reverse printing layer material;

[0134] S42: Bond the side with the hot melt adhesive on the intermediate layer material to the side with the RFID tag structure on the reverse printing layer material;

[0135] S43: Cut the composite material into flat sheets to obtain the composite layer material; among them, at least one RFID tag structure is included on one composite layer material;

[0136] S44: Dehumidify and apply pressure to the composite layer material after cutting into flat sheets. Among them, the pressure for applying pressure is 0.5 Mpa - 0.9 Mpa, the humidity is controlled at 30% - 55%, and the pressure application time is greater than 48 h.

[0137] S45: Return water to the composite layer material after dehumidifying and applying pressure, and control the moisture content at 6%. This step is used to restore the moisture content of the paper material. Appropriate moisture content can make the internal fibers and seasonings of the paper combine tightly, the paper has good elasticity, and can better release the internal stress generated by applying pressure.

[0138] The national standard "Determination of curl of paper and board - Single vertical hanging specimen method" with the standard number GB / T22896 - 2008 stipulates the method for determining the curl of paper by a vertically hanging specimen. During the cutting and determination process of the specimen, it is necessary to ensure that the specimen is exposed in a constant environment for a certain time after curling. The comparison of the curl before and after dehumidifying and applying pressure in this application is shown in Table 2.

[0139] Table 2: Comparison table of curl before and after dehumidifying and applying pressure.

[0140]

[0141] Among them, the unit of the curl is cm.

[0142] It can be seen from the data in Table 2 that the curl of the composite material after dehumidifying and applying pressure is greatly reduced. The lower curl significantly improves the stability of subsequent processes such as laminating and printing.

[0143] In this embodiment, the side with hot melt adhesive on the intermediate layer material is compounded with the side with RFID tag structure on the reverse printing layer material by means of roll-to-roll compounding using an existing compounding machine with CCD vision recognition and automatic deviation correction; among them, the chip size is about 0.65 mm × 0.6 mm, the accuracy is ±1 mm, and a round hole with a diameter of 3 mm is obtained after punching in S2.

[0144] Using a compounding machine with CCD vision recognition and automatic deviation correction for roll-to-roll compounding includes the following steps:

[0145] Loading the rolls; among them, the intermediate layer material is placed at the unwind position A, close to the two deviation correction shafts controlled by the double servo motors of the compounding machine; the reverse printing layer material is placed at the unwind position B closer to the winding position.

[0146] Peeling and compounding; the intermediate layer material passes through the separating roller of the compounding machine to peel off the base paper, and the base paper is wound up as waste; the adhesive side of the intermediate layer material faces up and is compounded with the reverse printing layer material through the pressure roller. Control the pressure of the pressure roller to ensure a flat fit without air bubbles or creases; control the winding tension to ensure that the winding edges are flush.

[0147] Cutting into sheets; placing the peeled and compounded material on the unwind mechanism of the roll-cut flat die cutter, and passing through the drive roller to the position of the guillotine controlled by air pressure. The guillotine is linked with the transmission device, and the cut length can be accurately controlled according to the set transmission speed.

[0148] The step of compounding the composite layer material and the front printing layer material to obtain a paper RFID card includes the following steps:

[0149] Adopting the mounting process to compound the composite layer material and the front printing layer material, where the mounting glue is set on the front printing layer material to prevent the glue from overflowing from the edge.

[0150] Specifically, it includes the following steps:

[0151] S51: Making the mounting glue;

[0152] In this embodiment, acrylic acid, acrylate, and trans-crotonic acid are used as raw materials to react to obtain a water-soluble resin polymer. Bio-based polyurethane dispersion, acrylate, and vinyl acetate are used as raw materials to emulsify to obtain a mixture of polyurethane dispersion and acrylate. The mixture is dropped into the water-soluble resin polymer, and white latex is obtained after reaction; at this time, the viscosity of the emulsion is low and not suitable for equipment such as mounting machines. Rosin resin is added to the white latex to thicken the emulsion, and water, dispersant, humectant, and defoamer are added. After stirring evenly, the mounting glue is obtained.

[0153] S52: Mounting and compounding;

[0154] In this embodiment, for the facing and laminating, a flat paper laminating machine is used. The front printing layer material has its paper surface (not the film surface) facing up and is coated with glue. It is conveyed to the lamination platform by a conveyor belt. At this time, a manipulator with a suction cup picks up the lamination layer material, locates the position of the front printing layer material through vision, and the manipulator presses down to complete the lamination action.

[0155] S53: Dehumidifying and maintaining pressure;

[0156] Since the moisture content in the pasting glue D is relatively high, the laminated material needs to be dehumidified and maintained under pressure again, and the specific requirements are the same as those in S44.

[0157] S54: Trimming the edges;

[0158] Since there are size differences in the layer materials after the step S53, it is necessary to trim the outer shape through a paper cutter. Each side shrinks inward by 1 mm - 5 mm based on the size of the front printing layer material. The material is placed horizontally, and the guillotine is perpendicular to the paper surface. After cutting, the paper material with the front printing layer material, the intermediate layer material, and the back printing layer material laminated together is obtained.

[0159] A paper RFID card includes a front printing layer, an intermediate layer, and a back printing layer from top to bottom. Among them, the back printing layer includes an RFID tag structure, and the structure of the RFID tag structure includes the following steps:

[0160] Pre-drying the back roll paper material;

[0161] Printing an antenna on the back roll paper material;

[0162] Installing an RFID chip on the antenna to obtain the back printing layer material.

[0163] The printing of the antenna on the back roll paper material includes the following steps:

[0164] Making a silk screen printing plate;

[0165] Making a conductive thick paste;

[0166] Rolling the conductive thick paste and performing fineness testing and viscosity testing on the conductive thick paste to obtain a qualified paste;

[0167] Using the qualified paste for screen printing the antenna;

[0168] Drying the back roll paper material;

[0169] Screen printing insulating varnish, where the insulating varnish is used to prevent bridge short circuits;

[0170] Screen printing connecting silver paste, where the connecting silver paste is used for bridging.

[0171] The front printing layer of the paper RFID card is made of the front printing layer material, the middle layer is made of the middle layer material, and the back printing layer is made of the 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 as Avery hot melt adhesive film Fsaaon-HP104;

[0175] The conductive thick paste of the RFID tag structure can be Hashen 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 back printing layer material is 170g white cardboard.

[0177] The national standard "Evaluation Method for Recyclability of Paper, Paperboard and Paper Products" with the standard number GB / T43588-2023 describes two evaluation methods for the recyclability of paper products, and method B is applicable to printed or unprinted paper products. Among them, recyclability refers to the ability of paper, paperboard and paper products to be effectively recycled and used for the production of certain grades of paper, paperboard and paper products based on general recycling standards and processes.

[0178] There are three indicators for evaluating recyclability by method B in the national standard GB / T43588-2023: screen residue rate, hand sheet viscosity test and optical uniformity. The specific standards are shown in Table 3 below.

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

[0180]

[0181] Table 3 details the recyclability evaluation standards and corresponding recyclability evaluation results of the screen residue rate, hand sheet viscosity test and optical uniformity. Among them, if any one of the evaluations in Table 3 is limited recyclable / non-recyclable, the result is the corresponding evaluation. For example, if the screen residue rate is recyclable, the viscosity is recyclable, and the optical uniformity is limited recyclable, the overall evaluation is limited recyclable.

[0182] Such as Figures 2 to 6 , are the recyclability evaluation results of three paper RFID card samples of this application. Among them, Figure 2 is the test result graph of the screen residue rate of the present invention. It can be seen that the paper RFID card of this application belongs to recyclable in the item of screen residue rate;Figure 3 It is the screen residue picture after the screen residue rate test of the present invention; Figure 4 It is the test result picture of the hand sheet viscosity of the present invention. It can be seen that the paper-based RFID card of the present application is recyclable in the hand sheet viscosity test; Figure 5 It is the physical picture of the hand sheet after the hand sheet viscosity test of the present invention, and the optical uniformity result of the hand sheet can also be observed; Figure 6 It is the test result picture of the optical uniformity of the hand sheet of the present invention. It can be known that the paper-based RFID card of the present application belongs to limited recyclability in the optical uniformity evaluation.

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

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

[0185] (1) The reverse printing layer of the paper-based RFID card replaces the base material of the electronic tag layer, removes the electronic tag layer, and reduces the thickness of the paper-based RFID card; at the same time, omitting the electronic tag layer can avoid setting an adhesive layer between the electronic tag layer and structures such as the intermediate layer or the front printing layer, which not only reduces materials and processes, but also makes the overall thickness more uniform, the produced card is flatter, and improves the overall grade of the card.

[0186] (2) The RFID industry is mainly based on roll-to-roll manufacturing, and the printing industry is mainly based on flat sheets. In the process of the present invention, the first half is roll-to-roll manufacturing, and the second half is switched to flat sheet manufacturing. In the process of cutting the roll into sheets, problems such as different fiber distribution directions of the paper material, differences between components, or uneven tension on the front and back surfaces during equipment operation and uneven shrinkage caused by drying will inevitably cause excessive warping of the paper. The present invention fully considers and specifically solves the problem of poor connection between the two types of manufacturing processes in the RFID industry and the printing industry. It adopts a production method combining roll-to-roll process and flat sheet process, introduces a process of dehumidifying, maintaining pressure and then returning water after cutting the roll into a flat sheet, and applies an external force during the process of the paper losing and then returning water, making the flat sheet flatter. The lower warping degree greatly improves the adaptability of laminating and printing on the machine, and solves the problem of high rejection rates of subsequent laminating and printing caused by paper warping.

[0187] (3) The materials prepared by the method of the present application are tested for their recyclability, and the result is limited recyclability with recycling value, which is green and environmentally friendly.

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

Claims

1. A manufacturing method of a paper RFID card, characterized in that, The steps include the following: Construct the front printing layer material; Construct the intermediate layer material; Construct the back printing layer material, wherein the back printing layer material includes a back roll paper material and an RFID tag structure constructed on the back printing layer material; Compound the back printing layer material and the 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; Compound the composite layer material and the front printing layer material to obtain a paper RFID card; The construction of the intermediate layer material includes the following steps: Perform full roll pre-drying on the intermediate layer material roll; Produce hot melt adhesive; Coat the hot melt adhesive on one surface of the intermediate layer material roll; Compound the release paper with the surface of the intermediate layer material roll coated with the hot melt adhesive to obtain the intermediate layer material; Wherein, the material of the hot melt adhesive is a rubber-based hot melt adhesive material, and the material of the release paper is a paper material with single-sided silicone coating; Construct an avoidance hole on the intermediate layer material; The compounding of the back printing layer material and the intermediate layer material to obtain a composite layer material includes the following steps: Peel off the release paper of the intermediate layer material; Compound the side with the hot melt adhesive on the intermediate layer material with the side with the RFID tag structure on the back printing layer material; Cut the compounded material into flat sheets to obtain the composite layer material; Perform dehumidification and pressure maintenance on the cut flat sheet composite layer material, wherein the pressure for pressure maintenance is 0.5 Mpa - 0.9 Mpa, the humidity is controlled at 30% - 55%, and the pressure maintenance time is greater than 48 h; Perform water return on the dehumidified and pressure-maintained composite layer material to make the moisture content of the composite layer material 6%; The compounding of the composite layer material and the front printing layer material to obtain a paper RFID card includes the following steps: Produce pasting glue; Perform counterpasting and compounding on the composite layer material and the front printing layer material; Perform dehumidification and pressure maintenance on the counterpasted and compounded material; Trim the dehumidified and pressure-maintained material to obtain a paper RFID card; Wherein, the front printing layer material is a flat sheet of paper.

2. The manufacturing method of the paper RFID card according to claim 1, characterized in that, The construction of the back printing layer material, wherein the back printing layer material includes a back roll paper material and an RFID tag structure constructed on the back printing layer material, includes the following steps: Pre-dry the back roll paper material; Print an antenna on the back roll paper material; Install an RFID chip on the antenna to obtain the back printing layer material; The printing of the antenna on the back roll paper material includes the following steps: Produce conductive thick paste; Roll the conductive thick paste and perform fineness test and viscosity test on the conductive thick paste to obtain a qualified paste; Use the qualified paste for screen printing the antenna; Dry the back roll paper material; Screen print insulating varnish, and the insulating varnish is used to prevent bridge short circuit; Screen print connecting silver paste, and the connecting silver paste is used for bridging.

3. The manufacturing method of the paper RFID card according to claim 2, wherein The qualified paste meets the following conditions: When the qualified paste is mixed with organic varnish at a ratio of 1:2 and stirred evenly, the fineness is less than or equal to 20 μm.

4. The manufacturing method of the paper RFID card according to claim 1, characterized in that The construction of the front printing layer material includes the following steps: Compound the front printing layer paper material with a laser film through water-based glue to obtain the front printing layer material.

5. A paper RFID card, characterized in that, Manufactured by the method for manufacturing a paper RFID card according to any one of claims 1-4, comprising a front printing layer, an intermediate layer, and a back printing layer, wherein the back printing layer comprises an RFID tag structure, and the structure of the RFID tag structure comprises the following steps: Pre-dry the rolled paper material on the back side; Print an antenna on the rolled paper material on the back side; Install an RFID chip on the antenna to obtain the back printing layer material; The printing of the antenna on the rolled paper material on the back side comprises the following steps: Prepare a conductive thick slurry; Roll the conductive thick slurry and perform fineness testing and viscosity testing on the conductive thick slurry to obtain a qualified slurry; Use the qualified slurry to screen-print the antenna; Dry the rolled paper material on the back side; Screen-print an insulating varnish, wherein the insulating varnish is used to prevent short-circuiting across the bridge; Screen-print a connecting silver paste, wherein the connecting silver paste is used for bridging.

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