Elastic conductive yarn, preparation method and wearable equipment applying elastic conductive yarn

Abstract

The invention discloses an elastic conductive yarn, a preparation method and wearable equipment applying the elastic conductive yarn, the elastic conductive yarn comprises an elastic shaft core, a substrate layer, a conductor layer and an insulating layer, and yarn of the substrate layer is spirally wound on the outer side of the elastic shaft core at a single turn pitch in the same direction; yarns of the conductor layer are spirally wound on the outer sides of the elastic shaft core and the substrate layer at a plurality of turn pitches along the same direction, and the insulating layer is spun and coated on the outer sides of the elastic shaft core, the substrate layer and the conductor layer by adopting an eight-spindle galloping machine; wherein the conductor layer is formed by spinning one or two of chinlon, terylene or spandex air textured yarn plated metal nano-silver fibers. The conductive yarn not only has excellent conductivity, but also has good flexibility and elasticity, can meet the requirements of wearable equipment for material performance, and realizes accurate and efficient transmission of electrocardiosignals.

Description

Technical Field

[0001] The present application relates to the technical field of elastic conductive yarns, and in particular to an elastic conductive yarn, a preparation method and a wearable device using the same. Background Art

[0002] With the rapid development of science and technology, wearable devices have become an indispensable part of people's daily lives. These devices not only have various intelligent functions, but also can fit closely to the human body to provide personalized services and experiences. However, the performance of wearable devices depends largely on the conductive components inside them, especially the conductive yarns. Traditional conductive yarns have obvious limitations in terms of tensile properties and durability. When the human body undergoes complex deformations, such as bending and stretching, the conductive yarns are prone to breakage or the transmission of electrical signals is unstable, thus affecting the normal operation and user experience of wearable devices, and this is even more prominent in the transmission of ECG signals.

[0003] Most of the existing conductive yarns are made of materials such as metal fibers or carbon fibers. Metal fibers have good conductivity, but are not resistant to bending, have a noticeable foreign body sensation, and lack sufficient elasticity and durability. Carbon fibers have a large resistance and cannot meet the requirements for stable signal transmission. Therefore, neither metal fibers nor carbon fibers can meet the requirements of wearable devices for complex deformation and long-term use.

[0004] Therefore, in response to the above technical problems, how to provide an elastic conductive yarn with excellent tensile properties and stable transmission of electrical signals is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0005] The purpose of this application is to provide an elastic conductive yarn, a preparation method and a wearable device using the same. The conductive yarn not only has excellent conductive properties, but also has good flexibility and elasticity, can meet the requirements of wearable devices for material properties, and realize accurate and efficient transmission of electrocardiogram signals.

[0006] To achieve the above-mentioned purpose, the present application provides an elastic conductive yarn, comprising an elastic shaft core, a base layer, a conductor layer and an insulating layer, wherein the yarn of the base layer is spirally wound on the outside of the elastic shaft core with a single turn pitch and in the same direction, the yarn of the conductor layer is spirally wound on the outside of the elastic shaft core and the base layer with multiple turns pitch and in the same direction, and the insulating layer is woven and coated on the outside of the elastic shaft core, the base layer and the conductor layer by an 8-spindle walking machine;

[0007] The conductor layer is woven from one or two of nylon, polyester or spandex air-deformed yarn and metal-plated nano-silver fiber.

[0008] Preferably, the elastic shaft core is made of an elastomeric material of a regular quadrangular prism or an octahedral multi-prism, and the elastomeric material includes one of rubber thread, latex thread, spandex, polyether ester elastic fiber, and polyolefin elastic fiber.

[0009] Preferably, the base layer is composed of slightly elastic fibers, and the slightly elastic fibers include one of slightly elastic polyester fibers, stretch yarns, cotton fibers, and linen fibers.

[0010] Preferably, the insulating layer is composed of wear-resistant filaments, and the wear-resistant filaments include one of polyester filaments, polyurethane, nylon filaments, and polyimide filaments.

[0011] Preferably, a loop or semicircular loop is formed on the surface of the air-deformed yarn to increase the contact area between the metal nanosilver fiber plating layers, so that the yarn resistance of the conductor layer is less than 0.2Ω / cm.

[0012] Preferably, the yarns of the conductor layer are helically wound with 2-4 turns.

[0013] A method for preparing an elastic conductive yarn, comprising:

[0014] Making or selecting an elastic shaft core;

[0015] The yarn of the base layer is wound around the outer wall of the elastic shaft core in a spiral rotation manner, and the yarn of the conductor layer is wound around the outer side of the elastic shaft core and the base layer in a spiral rotation manner;

[0016] The insulating layer is woven and coated on the outer sides of the elastic shaft core, the base layer and the conductor layer.

[0017] Preferably, the method further comprises plating metal nano-silver on the fibers constituting the conductor layer, and using one of chemical silver plating and physical vapor deposition to uniformly cover the metal nano-silver on the fiber surface.

[0018] Preferably, the yarn spiral rotation process parameters of the base layer and the conductor layer include:

[0019] Twist: 800-1200T / M;

[0020] The lower spindle speed is 5000-7000;

[0021] Upper spindle speed 3000-6000;

[0022] Winding angle 10-20°.

[0023] A wearable device using elastic conductive yarn comprises a plurality of conductive elements, wherein the conductive elements are the elastic conductive yarn described above.

[0024] Compared with the above background technology, the present application uses a base layer to cover the outer layer of the elastic shaft core, so as to reduce the elastic conductive yarn from repeatedly rubbing against the conductor layer yarn due to stretching deformation during the stretching process, and maintain the resistance stability of the elastic conductive yarn during repeated stretching; in addition, nylon or polyester or spandex air-deformed yarn as the conductor layer fiber has the characteristics of high strength, high modulus and high wear resistance, so that the elastic conductor can maintain stable performance under different temperature and humidity conditions, and the nano silver plating technology gives the fiber excellent conductivity, so that the yarn resistance is less than 0.2Ω / cm, which can accurately and efficiently transmit ECG signals, thereby enabling the conductor layer to achieve stable transmission of electrical signals while ensuring the tensile performance of the yarn; the insulating layer can make the yarn less susceptible to the external environment during the stretching process, so as to protect the conductor layer and prevent ECG signal leakage. Therefore, the conductive yarn of the present application not only has excellent conductivity, but also has good flexibility and elasticity, which can meet the requirements of wearable devices for material performance and achieve accurate and efficient transmission of ECG signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0026] Figure 1 A flow chart of the method for preparing the elastic conductive yarn provided in the embodiment of the present application;

[0027] Figure 2 A graph showing the resistance change of the elastic conductive yarn provided in an embodiment of the present application after being stretched twice continuously;

[0028] Figure 3 This is a cyclic test diagram of the elastic conductive yarn provided in the embodiment of the present application being stretched twice continuously;

[0029] Figure 4 This is a test chart of a cycle of the elastic conductive yarn provided in an embodiment of the present application being stretched 10,000 times;

[0030] Figure 5 The elastic conductive yarn provided in the embodiment of the present application is connected to an electrical detection module to perform an electrocardiogram test in a static state;

[0031] Figure 6 This is an electrocardiogram test performed on the elastic conductive yarn provided in the embodiment of the present application after being stretched 10,000 times. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper", "lower", "front", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] In this embodiment, an elastic conductive yarn is provided, the conductive yarn comprising an elastic shaft core, a base layer, a conductor layer and an insulating layer, the yarn of the base layer has a single turn pitch and is spirally wound in the same direction on the outside of the elastic shaft core, the yarn of the conductor layer has multiple turns pitch and is spirally wound in the same direction on the outside of the elastic shaft core and the base layer, wherein the multiple turns pitches may be 2-4 turns pitches. The insulating layer is woven by an 8-spindle walking machine and is coated on the outside of the elastic shaft core, the base layer and the conductor layer.

[0036] In addition, the conductor layer is woven from one or two of nylon, polyester or spandex air-deformed silk coated with metal nano-silver fibers. The fiber has the characteristics of high strength, high modulus and high wear resistance, and the nano-silver plating technology gives the fiber excellent conductive properties, enabling the ECG signals to be transmitted accurately and efficiently.

[0037] In some embodiments, the elastic shaft core is made of an elastomeric material in the form of a regular tetrahedron or an octahedral multi-prism. During the stretching process, the elastic shaft core is precisely combined with the base layer to prevent sliding. The elastomeric material includes one of rubber thread, latex thread, spandex, polyether ester elastic fiber, and polyolefin elastic fiber.

[0038] The base layer is composed of micro-elastic fibers, including micro-elastic polyester yarn, stretch yarn, specially treated cotton fiber, linen fiber, etc. The base layer is coated on the outer layer of the elastic shaft core. The elastic wire will not repeatedly rub the conductor layer yarn due to the deformation of the elastic shaft core during the stretching process, so as to maintain the resistance stability of the elastic conductive yarn after repeated stretching and maintain the stability of signal transmission.

[0039] The insulating layer is composed of wear-resistant filaments, including one of polyester filament polyurethane, nylon filament, polyimide filament, etc., and is woven on an 8-spindle tweezers. This design not only improves the wear resistance and insulation of the conductive yarn, but also makes the conductive yarn less susceptible to the external environment during stretching, so as to protect the conductor layer and prevent ECG signal leakage.

[0040] For the metal nano-silver fibers plated with the conductor layer, loops or semicircular loops can be formed on the surface of the air-deformed yarn to increase the contact area between the metal nano-silver fiber plating layers and reduce the resistance of the conductive yarn. The resistance of the conductive yarn is made less than 0.2Ω / cm, which can accurately and efficiently transmit electrocardiographic signals while feeling fluffy.

[0041] In summary of the above embodiments, the present application utilizes a base layer to cover the outer layer of the elastic shaft core, thereby reducing the elastic conductive yarn from repeatedly rubbing against the conductor layer yarn due to stretching deformation during the stretching process, and maintaining the resistance stability of the elastic conductive yarn during repeated stretching; in addition, nylon or polyester or spandex air-deformed yarn as the conductor layer fiber has the characteristics of high strength, high modulus and high wear resistance, so that the elastic conductor maintains stable performance under different temperature and humidity conditions, and the nano-silver plating technology gives the fiber excellent conductive properties. At the same time, the air-deformed yarn surface ring or semi-circular wire ring increases the contact area between the metal nano-silver fiber coating and the coating, reduces the yarn resistance, and makes the yarn resistance <0.2Ω / cm, which can accurately and efficiently transmit ECG signals, thereby enabling the conductor layer to achieve stable transmission of electrical signals while ensuring the tensile performance of the yarn; the insulating layer is woven using an 8-spindle walking machine, which improves the wear resistance and insulation of the yarn, and also makes the yarn less susceptible to the external environment during the stretching process, so as to protect the conductor layer and prevent ECG signal leakage. It can be seen that the elastic conductive yarn of the present application is made of textile materials as a whole, has good flexibility, can adapt to the bending and stretching requirements of wearable devices, can be repeatedly stretched more than 10,000 times, has excellent durability and long service life.

[0042] The present application also provides a method for preparing an elastic conductive yarn, such as Figure 1 As shown, the following steps are included:

[0043] S1, making or selecting an elastic shaft core;

[0044] S2, the yarn of the base layer is wound around the outer wall of the elastic shaft core in a spiral rotation manner, and the yarn of the conductor layer is wound around the outer side of the elastic shaft core and the base layer in a spiral rotation manner;

[0045] S3, the insulating layer is woven and wrapped around the outer side of the elastic shaft core, the base layer and the conductor layer;

[0046] It also includes the step of plating metal nanosilver on the fibers that constitute the conductor layer, thereby increasing the contact area between the metal nanosilver fiber coatings; it should be pointed out that the air-deformed yarn is processed by high-speed airflow to produce irregular curls or loops on the fiber surface, which may increase the surface area and facilitate the adhesion of the coating; in the processing of the air-deformed yarn, the airflow speed, temperature, fiber tension can be adjusted, or different nozzle designs can be used during processing to affect the degree of deformation of the yarn, forming more loops or semicircular structures.

[0047] If the silk surface has more protrusions or ring-like structures, it may be possible to use physical vapor deposition (PVD) or chemical plating to make the nanosilver particles more evenly cover the complex surface of the silk, increase the contact points between the coatings, and thus increase the contact area between the coatings.

[0048] Secondly, when preparing the elastic conductive yarn, the spiral rotation process parameters of the elastic shaft core, base layer and conductor layer are: twist: 800-1200T / M; lower spindle speed 5000-7000; upper spindle speed 3000-6000; winding angle 10-20°.

[0049] The test standards / test methods used for the elastic conductive yarn prepared by the above method are as follows:

[0050] Elongation and tensile strength: tested in accordance with GB / T 1040.2 2022; the elongation of the elastic conductive yarn for ECG signal transmission was tested using an MTS E42.503 tensile machine. The test was conducted at a relative humidity of 50%, a temperature of 25°C, an initial clamp distance of 50cm, a tensile rate of 100%, and a crossbar speed of 500mm / min.

[0051] Static conductivity: In the absence of external force, the DMM6500 digital multimeter is used to test the resistance of the stretchable conductive signal line using the two-point method; during the specific test, the static resistance value is measured in an environment with a temperature of 25°C and a relative humidity of 65%.

[0052] Tensile resistance stability and stretching cycle stability: At room temperature, the stretchable conductive signal line is subjected to a stretching cycle test using an MTS E42.503 stretching machine. The stretchable conductive signal line is subjected to a tensile resistance stability test using an MTS E42.503 stretching machine and a DMM6500 digital multimeter.

[0053] The final elongation of the elastic conductive yarn is 100% or more. In addition, based on the elongation of 100%, the resistance change after two consecutive stretches is as follows: Figure 2As shown in the figure, the resistance variation range is less than 0.0015Ω / cm. The resistance value of the conductive yarn stretched 10,000 times with a 100% stretching ratio varies within a range of less than 0.01Ω / cm.

[0054] Please refer to Figure 3 and Figure 4 , Figure 3 This is a cycle diagram of two consecutive stretches at 100% stretching rate. Figure 4 This is a cycle diagram of stretching 10,000 times at 100% stretching rate. It can be clearly seen that after repeated stretching 10,000 times, the elastic conductive yarn of the present application still has excellent and stable tensile properties.

[0055] Please refer to Figure 5 , Figure 5 The tester wears the elastic conductive yarn obtained in this embodiment and connects the electrical detection module to perform an electrocardiogram test in a static state. Figure 6 From the electrocardiogram test conducted when the elastic conductive yarn was stretched 10,000 times, it can be seen that the elastic conductive yarn of the present application still has the advantage of stable transmission of electrical signals.

[0056] The present application also provides a wearable device using elastic conductive yarn, wherein the wearable device includes a plurality of conductive elements, and the conductive elements are the elastic conductive yarn mentioned above.

[0057] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0058] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An elastic conductive yarn, characterized in that: It comprises an elastic shaft core, a base layer, a conductor layer and an insulating layer, wherein the yarn of the base layer is spirally wound on the outside of the elastic shaft core with a single turn pitch and in the same direction, the yarn of the conductor layer is spirally wound on the outside of the elastic shaft core and the base layer with multiple turns pitch and in the same direction, and the insulating layer is woven by an 8-spindle walking machine and coated on the outside of the elastic shaft core, the base layer and the conductor layer; Wherein, the conductor layer is woven from one or two of nylon, polyester or spandex air-deformed yarn and metal nano-silver-plated fiber.

2. The elastic conductive yarn according to claim 1, characterized in that The elastic shaft core is made of an elastic material of a regular quadrangular prism or an octahedral multi-prism, and the elastic material includes one of rubber thread, latex thread, spandex, polyether ester elastic fiber, and polyolefin elastic fiber.

3. The elastic conductive yarn according to claim 1, characterized in that: The base layer is composed of slightly elastic fibers, and the slightly elastic fibers include one of slightly elastic polyester fibers, stretch yarns, cotton fibers, and linen fibers.

4. The elastic conductive yarn according to claim 1, characterized in that: The insulating layer is composed of wear-resistant filaments, and the wear-resistant filaments include one of polyester filaments, polyurethane, nylon filaments, and polyimide filaments.

5. The elastic conductive yarn according to claim 1, characterized in that: A loop or semicircular loop is formed on the surface of the air-deformed yarn to increase the contact area between the metal nano-silver fiber plating layers, so that the yarn resistance of the conductor layer is less than 0.2Ω / cm.

6. The elastic conductive yarn according to claim 1, characterized in that: The yarns of the conductor layer are helically wound with 2-4 turns.

7. A method for preparing an elastic conductive yarn, characterized in that: include: Making or selecting an elastic shaft core; The yarn of the base layer is wound around the outer wall of the elastic shaft core in a spiral rotation manner, and the yarn of the conductor layer is wound around the outer side of the elastic shaft core and the base layer in a spiral rotation manner; The insulating layer is woven and coated on the outer sides of the elastic shaft core, the base layer and the conductor layer.

8. The method for preparing the elastic conductive yarn according to claim 7, characterized in that: It also includes plating metal nano-silver on the fibers constituting the conductor layer, and using one of chemical silver plating and physical vapor deposition to evenly cover the metal nano-silver on the fiber surface.

9. The method for preparing the elastic conductive yarn according to claim 7, characterized in that: The yarn spiral rotation process parameters of the base layer and the conductor layer include: Twist: 800-1200T / M; The lower spindle speed is 5000-7000; Upper spindle speed 3000-6000; Winding angle 10-20°.

10. A wearable device using elastic conductive yarn, characterized in that: It comprises several conductive elements, wherein the conductive elements are the elastic conductive yarns according to any one of claims 1 to 6.

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