Copper wire sewing thread ultrahigh frequency antenna
By adopting a copper wire sewing thread UHF antenna, the problems of high cost and poor washability and ironing resistance of existing UHF RFID tags have been solved, realizing the application of low-cost and environmentally friendly UHF antennas and improving the level of information management.
Patent Information
- Application Number
- CN202423321579.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing UHF RFID tags are expensive in the footwear and apparel industry, are not resistant to washing and ironing, traditional processes pollute the environment and are costly, and carbon fiber antenna materials are expensive and complex to manufacture, making them difficult to apply widely.
The UHF antenna is made of copper wire sewing thread. It is formed by twisting bare copper wire and sewing thread together and sewing it onto the label fabric substrate. The antenna has a resistance of less than 2.5 ohms and a tensile strength of more than 10N. It is suitable for high-speed sewing machines, and is low in cost and environmentally friendly.
It achieves water resistance, folding resistance, and ironing resistance for ultra-high frequency antennas, with a cost that is only 1/6 of that of traditional PET aluminum foil chemically etched antennas and 1/120 of that of carbon fiber antennas. This promotes the widespread application of radio frequency technology in industries such as footwear, apparel, linens, and handbags, and improves the level of information management.
Smart Images
Figure CN223693359U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of ultra-high frequency antenna, and specifically relates to a copper wire sewing thread ultra-high frequency antenna. BACKGROUND
[0002] The application market of ultra-high frequency tags in the shoe and clothing industry develops rapidly, and the global annual consumption is nearly 10 billion pieces. The mainstream products of radio frequency tags in the shoe and clothing industry are paper tags and hang tags, and a small amount are washable radio frequency tags. However, different radio frequency tags have many defects.
[0003] 1. Defects of the application status of ultra-high frequency paper tags and hang tags in the shoe and clothing industry
[0004] A: Paper tags and hang tags cannot adapt to the washing of products in the shoe and clothing industry, and can only be applied in the storage, logistics and sales links. Consumers throw away the radio frequency paper tags as soon as they buy shoes and clothes. Moreover, paper tags and hang tags cannot be applied to the washing process of shoes and clothes, and thus cannot provide tracking and tracing of product information in the shoe and clothing industry, and the shoe and clothing industry has not realized the whole-process tracking service of products.
[0005] B: Ultra-high frequency paper tags have a four-layer structure: surface paper, inlay layer, pressure-sensitive adhesive layer and release paper layer. Because of the high manufacturing cost, only large clothing enterprises can accept it. Many shoe and clothing enterprises consider the cost and do not use ultra-high frequency tags and hang tags on products, and thus fail to realize information management of each product.
[0006] C: Demand for reducing the cost of ultra-high frequency paper tags and hang tags: The chip, paper and glue of ultra-high frequency paper tags are the basic costs that cannot be changed by tag manufacturers. The only thing that can be improved is the material and process of the ultra-high frequency antenna. The traditional PET aluminum foil composite film is processed through optical plate making, chemical etching and water washing. Not only is the cost high, but also a large amount of waste liquid and wastewater are produced, polluting the environment. An innovative ultra-high frequency antenna material and antenna manufacturing process are urgently needed.
[0007] D: The installation method of the ultra-high frequency antenna on the substrate of the tag determines the practicality of the radio frequency tag in the scene: the ultra-high frequency tag in the shoe and clothing industry needs to be resistant to washing and ironing, and the tag substrate needs to change paper into cloth that can withstand high temperature. The traditional inlay process of sticking the pressure-sensitive adhesive layer on the paper is not suitable for the washing and ironing scene, and an innovative installation method between the ultra-high frequency antenna and the cloth tag substrate is urgently needed.
[0008] 2. Application status and defects of washable ultra-high frequency cloth laundry tags
[0009] Unlike the paper radio frequency tag structure, the material of the ultra-high frequency antenna in the water-washing resistant ultra-high frequency cloth laundry tag is multi-strand carbon fiber, because the diameter of the carbon fiber antenna material is greater than 0.5 mm, only the disc folding forming process can be used on the tag cloth substrate to make the ultra-high frequency antenna in the shape of a sine wave, and then the sewing thread is used to fix it on the tag cloth. Thus, the requirements of water-washing resistance, folding and pressing resistance, washing resistance, and ironing resistance. However, the carbon fiber is high in cost, and the process of disc forming the antenna in the shape of a sine wave is complex, which is the reason for the high price of the laundry tag. It affects the popularization and application of the laundry tag.
[0010] Therefore, there is an urgent need for a conductive fiber material that can replace carbon fiber, a process for making an ultra-high frequency antenna, and a process for connecting the conductive fiber antenna to the tag cloth substrate. Practical new type content
[0011] In order to overcome the shortcomings of the existing technology, the utility model provides a copper wire sewing thread ultra-high frequency antenna.
[0012] The utility model technical scheme is as follows:
[0013] A copper wire sewing thread ultra-high frequency antenna, comprising a copper wire sewing thread formed by twisting bare copper wire and sewing thread, and the copper wire sewing thread is sewn on a tag cloth substrate to form a copper wire sewing thread ultra-high frequency antenna.
[0014] The diameter of the bare copper wire is 0.06-0.07 mm, wherein the bare copper wire with a diameter of 0.06 mm is called annealed copper wire, which is good in softness; the diameter of the sewing thread is 0.12 mm; and the diameter of the copper wire sewing thread is less than 0.2 mm. The twist of the bare copper wire and the sewing thread is greater than 400, which can ensure smooth sewing process without interruption.
[0015] The resistance of the copper wire sewing thread per meter is less than 7.5 ohms, and the resistance of the entire copper wire sewing thread ultra-high frequency antenna is less than 2.5 ohms, and the tensile strength is greater than 10 N.
[0016] The copper wire sewing thread can be sewn on the tag cloth substrate synchronously with the sewing base thread, so that one side surface of the tag cloth substrate has a sewing track of the copper wire sewing thread: if a straight line-shaped sewing track is selected, the length of the sewing track of the copper wire sewing thread is 100-120 mm; and if a zigzag or square wave-shaped sewing track is selected, the length of the sewing track of the copper wire sewing thread is 60-90 mm.
[0017] The copper wire sewing thread can also be sewn on the tag cloth substrate alone, so that the upper and lower surfaces of the tag cloth substrate both have a sewing track of the copper wire sewing thread: the length of the sewing track of the copper wire sewing thread in the straight line-shaped sewing track is 80-90 mm.
[0018] The copper wire sewing thread ultra-high frequency antenna has the advantages of good conductivity, small diameter, large tensile strength, good softness, high-speed sewing machine sewing on cloth material, water washing resistance, fold pressure resistance, ironing resistance, high production efficiency, and the production cost is only 1 / 6 of the traditional PET aluminum foil chemical etching antenna cost, 1 / 120 of the existing carbon fiber antenna production cost, which is beneficial to promote the wide application of radio frequency technology in shoe and clothing industry, linen industry and handbag industry, and improves the information management level. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1a It is a schematic view of the copper wire sewing thread ultra-high frequency antenna with bottom line.
[0020] Figure 1b It is a schematic view of the copper wire sewing thread ultra-high frequency antenna without bottom line.
[0021] Figure 2 It is a comparison schematic view of the line materials of various materials in diameter, conductivity and sewing adaptability.
[0022] Figure 3a It is a schematic view of the sawtooth copper wire sewing thread ultra-high frequency antenna.
[0023] Figure 3b It is a schematic view of the trapezoidal copper wire sewing thread ultra-high frequency antenna.
[0024] Figure 3c It is a schematic view of the square wave copper wire sewing thread ultra-high frequency antenna.
[0025] Figure 3d It is a schematic view of the approximately sinusoidal copper wire sewing thread ultra-high frequency antenna.
[0026] Figure 3e It is a schematic view of the combined copper wire sewing thread ultra-high frequency antenna.
[0027] Figure 4 It is a schematic view of the copper wire sewing thread ultra-high frequency antenna and the micro double coil radio frequency resonance cavity assembly coupled into the radio frequency marker with antenna wing.
[0028] Figure 5 It is a schematic view of the copper wire sewing thread ultra-high frequency antenna and the single coil radio frequency resonance cavity assembly coupled into the radio frequency marker with antenna wing.
[0029] In the drawings, each reference numeral is:
[0030] 1, copper wire sewing thread; 2, sewing bottom line; 3, upper layer of label cloth; 4, lower layer of label cloth; 5-1, micro double coil radio frequency resonance cavity assembly; 5-2, single coil radio frequency resonance cavity assembly. DETAILED DESCRIPTION
[0031] The utility model is further described below in combination with the drawings and embodiments:
[0032] As shown in the figure, Figures 1a to 5 The utility model discloses in order to solve the defect such as high cost, not washing and ironing of the existing shoe and clothing industry etc. industry ultra high frequency radio frequency label, proposes a copper wire sewing thread ultra high frequency antenna, it is sewn on the label cloth base material by copper wire sewing thread 1, to form copper wire sewing thread ultra high frequency antenna.
[0033] The copper wire sewing thread 1 is formed by twisting bare copper wire and sewing thread. In order to guarantee the basic performance of copper wire sewing thread 1 to make ultra high frequency antenna, the diameter of bare copper wire selected by the utility model is 0.06mm-0.07mm, wherein the bare copper wire with 0.06mm diameter is called annealed copper wire, and the flexibility is better. The diameter of the sewing thread selected by the utility model is 0.12mm.
[0034] The label cloth base material can be single-layer cloth label or double-layer cloth label (such as upper label cloth 3 and lower label cloth 4).
[0035] In the process of making copper wire sewing thread 1, the twist degree when twisting bare copper wire and sewing thread is greater than 400, which can ensure that the sewing process is smooth and the thread breakage does not occur. In the utility model, the resistance of copper wire sewing thread 1 per meter is less than 7.5 ohms, and the resistance of the whole ultra high frequency antenna is less than 2.5 ohms; the diameter of copper wire sewing thread 1 is less than 0.2mm, and the tensile strength is greater than 10N, which can meet the basic performance of copper wire sewing thread 1 to make ultra high frequency antenna.
[0036] As shown in the figure, Figures 3a to 3e In the utility model, the sewing track of copper wire sewing thread 1 to form ultra high frequency antenna can be sawtooth shape, trapezoidal shape, wave shape, approximately sinusoidal shape, or a combination of the above shapes, which can be selected according to different requirements.
[0037] As shown in the figure, Figure 1a In the utility model, copper wire sewing thread 1 can be sewn on the label cloth base material synchronously with sewing base thread 2, so that one side surface of the label cloth base material has the sewing track of copper wire sewing thread 1. In the sewing process, copper wire sewing thread 1 located on the upper side of the label cloth base material and sewing base thread 2 located on the lower side of the label cloth base material cross winding with the inside of the label cloth base material, and the copper wire sewing thread 1 and the sewing base thread 2 after winding walk forward respectively.
[0038] Based on the walking mode, the length of the sewing track of copper wire sewing thread 1 with straight line shape is 100mm-120mm; the length of the sewing track of copper wire sewing thread 1 with sawtooth shape or square wave shape is 60mm-90mm.
[0039] As Figure 1b shown, the copper wire sewing thread 1 can also be sewn on the label fabric substrate alone, so that the upper and lower surfaces of the label fabric substrate have the sewing track of the copper wire sewing thread 1. During the sewing process, the copper wire sewing thread 1 is wound forward after passing through the label fabric substrate at the current stitch position and the copper wire sewing thread 1 extended from the previous stitch, and is turned back at the next stitch position and passes through the current stitch position, and the copper wire sewing thread 1 after passing through the current stitch position is threaded to the next stitch position and passes downward.
[0040] Based on the threading mode, since the copper wire sewing thread 1 leaves a sewing track on the upper and lower surfaces of the label fabric substrate, and the sewing track on the lower side of the label fabric substrate is composed of two copper wire sewing threads 1, the sewing length based on the threading mode is shorter than the threading length of the previous embodiment with the sewing base thread. Specifically, the length of the straight-line-shaped copper wire sewing thread 1 is 80-90 mm.
[0041] The copper wire sewing thread ultra-high frequency antenna in the manufacturing process of the utility model:
[0042] S1, selecting bare copper wire and sewing thread, twisting to form copper wire sewing thread;
[0043] S2, determining to use copper wire sewing thread alone to sew ultra-high frequency antenna, or selecting copper wire sewing thread and sewing base thread to sew ultra-high frequency antenna at the same time;
[0044] S3, determining the stitch track, stitch step, and sewing length;
[0045] S4, sewing copper wire sewing thread on the label fabric substrate to form an ultra-high frequency antenna.
[0046] After the sewing is completed, the step of determining the ultra-high frequency antenna manufacturing process standard specification is further included: first, sew different parameter ultra-high frequency antennas respectively, and measure the sensitivity; then, according to the measured identification sensitivity of the ultra-high frequency antenna, change the stitch track, stitch step, and sewing length to obtain the sewing parameters when the best identification sensitivity is obtained, and formulate the process standard of the sewing antenna.
[0047] As Figure 1a , Figure 1b , Figure 4 , Figure 5As shown, in this invention, the ultra-high frequency antenna made of copper wire can be combined with different radio frequency resonant cavities and radio frequency chips to form a complete radio frequency tag. In specific implementation, the ultra-high frequency antenna can be coupled with the radio frequency resonant cavity and radio frequency chip and then directly encapsulated between the upper label fabric and the lower label fabric 4 to form an radio frequency tag. Alternatively, the radio frequency resonant cavity can be coupled with the radio frequency chip and then wrapped between the upper label fabric 3 and the lower label fabric 4. The upper label fabric 3 and the lower label fabric 4 are then sewn together using copper wire, completing the coupling between the ultra-high frequency antenna and the radio frequency resonant cavity, thereby forming an radio frequency tag.
[0048] Specifically, in Figure 4 In this design, a sinusoidal ultra-high frequency antenna is connected to a miniature dual-coil RF resonant cavity assembly 5-1 (including the dual-coil RF resonant cavity and RF chip) to form an RFID tag with antenna wings. Figure 5 In the process, a sawtooth-shaped ultra-high frequency antenna is coupled to a single-turn radio frequency resonant cavity assembly 5-2 (including a single-turn radio frequency resonant cavity and a radio frequency chip) to form an RFID tag with antenna wings.
[0049] When using sewing techniques to manufacture UHF antennas, the requirements for antenna materials include:
[0050] (1) Electrical conductivity
[0051] Meeting the conductivity requirements of UHF antennas is one of the important conditions for fabricating UHF antenna materials. The performance of UHF antennas is evaluated by their quality factor. The quality factor of an UHF antenna is Q = 2πfL / R, where f is the frequency of the UHF signal, L is the equivalent inductance of the UHF antenna, and R is the resistance of the UHF antenna.
[0052] In practice, when the resistance of an UHF antenna is greater than 2.5 ohms, the sensitivity of the UHF antenna begins to decrease. Therefore, the resistance of the UHF antenna should be below 7.5 ohms per meter.
[0053] (2) Diameter
[0054] When sewing an UHF antenna onto a label substrate using a sewing process, the diameter of the conductive fiber or other thread must be less than 0.2mm. It is also necessary to ensure that sewing, whether with or without a bobbin, will not affect the normal operation of the sewing machine.
[0055] (3) Tensile strength
[0056] The tensile strength of the ultra-high frequency antenna material is greater than 9.5N, which allows it to remain unbroken on a high-speed industrial sewing machine.
[0057] (4) Adaptability of sewing buttons
[0058] The flatness of the antenna sewn onto the label fabric is affected by the softness of the antenna material, requiring the conductive fiber to have a softness similar to that of 402 / S fine sewing thread.
[0059] Figure 2 The comparisons of sewing thread, copper wire, copper wire sewing thread, covered thread, conductive fiber, carbon fiber, and multi-strand carbon fiber in terms of diameter, conductor performance, and sewing adaptability are presented respectively. As can be seen from the figures:
[0060] like Figure 2 As indicated by the solid dot, in terms of electrical conductivity: copper wire, copper sewing thread, yarn-covered thread, and multi-strand carbon fiber all meet the standards; for example... Figure 2 As shown in the solid triangle, in terms of diameter: the diameters of copper wire, copper sewing thread, conductive fiber, and single-strand carbon fiber are all less than 0.2 mm; such as Figure 2 As shown in the hollow circle, in terms of sewing adaptability: sewing thread, copper wire sewing thread, and conductive fiber have better sewing characteristics.
[0061] The comparison shows that:
[0062] (1) Conductive fibers made by electroplating or coating conductive layers on the fiber surface have poor conductivity: due to the high resistivity of vacuum coating on the fiber surface and single-strand carbon fiber, the resistance per meter is much greater than 7.5 ohms. Therefore, it is suitable for making antistatic fabrics and electromagnetic shielding fabrics, but cannot be used to sew ultra-high frequency antennas.
[0063] (2) The thin copper wire with a diameter of 0.06 mm has poor tensile strength: The thin copper wire with a diameter of 0.06 mm has good conductivity and softness, but its tensile strength is less than 1N, which makes it very easy to break during sewing. It is impossible to use a high-speed sewing machine to mass-produce ultra-high frequency antennas on fabric.
[0064] (3) Poor sewing characteristics of cotton-coated wire: Copper-coated wire has good electrical conductivity and tensile strength, but its diameter is greater than 0.2mm and its softness is poor. The surface of the sewn UHF antenna is obviously raised, making it impossible to mass-produce UHF antennas on high-speed sewing machines.
[0065] In summary, this utility model utilizes copper wire sewing thread to manufacture ultra-high frequency (UHF) antennas for footwear and apparel industry UHF tags.
[0066] The copper wire sewing thread ultra-high frequency antenna of this utility model has the following application features and advantages:
[0067] (1) Ultra-high frequency performance
[0068] The copper wire sewing thread UHF antenna of this invention has high radio frequency identification sensitivity, and its bandwidth can be up to 100MHz within a -2dB bandwidth.
[0069] (2)Cost
[0070] 402 high-speed sewing thread 10000 code for 3 yuan, high-speed sewing thread 0.0004 yuan per meter; 0.06 mm bare copper wire 0.005 yuan per meter. The cost of twisting bare copper wire and sewing thread together is 50% of the price of sewing thread and copper wire, so the material and twisting cost of copper wire sewing thread per meter is 0.0054*1.5=0.0081 yuan (with market sales price fluctuation, only for example here).
[0071] Considering the loss of 3 ultra-high frequency antennas per meter of sewing thread, the material cost of each antenna is 0.0027 yuan, that is, the material cost of each ultra-high frequency antenna is 2.7 cents. Its cost is 1 / 6 of the cost of traditional PET composite aluminum foil chemical etching to make ultra-high frequency antenna, and 1 / 120 of the cost of carbon fiber ultra-high frequency antenna.
[0072] (3) Environmental protection and efficiency
[0073] Compared with the PET aluminum foil ultra-high frequency antenna of chemical etching process and the multi-strand carbon fiber ultra-high frequency antenna, the copper wire sewing thread ultra-high frequency antenna has five advantages: (1) environmental protection, no chemical etching process, no waste liquid and waste water; (2) the antenna is sewn on the label cloth, which is resistant to washing, folding, pressing and ironing; (3) high production efficiency; (4) changing the pattern and size of the ultra-high frequency antenna is more convenient and fast; (5) enterprises with sewing machines can make ultra-high frequency antennas and corresponding radio frequency tags on their own products.
[0074] The copper wire sewing thread ultra-high frequency antenna of the utility model contributes to the application of radio frequency tags in laundry industry, shoe and clothing industry, handbag industry, home textile industry, cloth packaging industry, etc.
[0075] A. The ultra-high frequency antenna of the radio frequency function laundry tag is changed from carbon fiber ultra-high frequency antenna to copper wire sewing thread ultra-high frequency antenna, which greatly reduces the production cost, promotes the adoption of radio frequency function laundry tags in laundry industry and linen industry, realizes automatic identification, error correction and automatic statistics at each process node such as receiving, washing, ironing, sorting and delivering, realizes personnel reduction, cost reduction, benefit increase and zero error, and upgrades the information management of labor-intensive laundry industry and linen industry.
[0076] B. The copper wire sewing thread ultra-high frequency antenna of the utility model creates a new way for manufacturers of clothing industry, shoe industry, home textile industry and handbag industry to make cloth radio frequency tags by themselves, so that all enterprises with sewing machines can use copper wire sewing thread to make ultra-high frequency antennas, and then couple them with radio frequency resonant cavity assembly to make cloth radio frequency tags, which greatly reduces the production cost of radio frequency tags and promotes the application and popularization of radio frequency identification technology.
[0077] C.The utility model discloses a cloth radio frequency label's price is lower than paper radio frequency price, is favorable to the radio frequency label of shoe and clothing industry from paper label upgrade cloth radio frequency label, let radio frequency technology from warehouse, sales field application expands to washing and use process tracking service, promotes shoe and clothing industry, cloth industry, handbag industry to adopt radio frequency identification technology, promotes information management.
[0078] D.Part of the long-distance transportation industry, logistics industry and other industries that provide cloth packaging, as well as ton bag packaging, express post set bag, tobacco binding tape manufacturers, are limited by the high price of traditional cloth radio frequency label, and cannot provide radio frequency label for cloth packaging. However, the utility model uses copper wire sewing thread to make ultra-high frequency antenna, which can make such enterprises themselves make low-cost ultra-high frequency label on the product, and promote the management informatization of long-distance transportation industry and logistics industry.
Claims
1. A copper wire sewing thread ultra-high frequency antenna, characterized by, The copper thread sewing thread is formed by twisting bare copper wire and sewing thread. The copper thread sewing thread is sewn on a label fabric substrate to form a copper thread sewing thread ultra-high frequency antenna.
2. The copper-wire sewing thread UHF antenna according to claim 1, characterized in that, The diameter of the sewing thread is 0.12 mm.
3. The copper-wire sewing thread UHF antenna according to claim 1, characterized in that, The resistance per meter of the copper thread sewing thread is less than 7.5 ohms.
4. The copper-wire sewing thread UHF antenna according to claim 1, characterized by The copper thread sewing thread is sewn on the label fabric substrate synchronously with a sewing base thread, so that one side surface of the label fabric substrate has a sewing track of the copper thread sewing thread.
5. The copper-wire sewing thread UHF antenna according to claim 4, characterized in that, The length of the sewing track of the copper thread sewing thread with a straight-line sewing track is 100-120 mm.
6. The copper-wire sewing thread UHF antenna according to claim 4, characterized in that, The length of the sewing track of the copper thread sewing thread with a sawtooth or square wave sewing track is 60-90 mm.
7. The copper-wire sewing-thread ultrahigh-frequency antenna according to claim 1, wherein The copper thread sewing thread is sewn on the label fabric substrate alone, so that both upper and lower surfaces of the label fabric substrate have the sewing track of the copper thread sewing thread.
8. The copper-wire sewing thread UHF antenna according to claim 7, characterized in that, The length of the sewing track of the copper thread sewing thread with a straight-line sewing track is 80-90 mm.