Planar electric heating neck guard band based on stone needle-knitted composite layer and preparation method

Abstract

The invention discloses a planar electric heating neck protection band based on a stone needle-knitted composite layer and a preparation method. A neck protection band body is sequentially provided with a skin-friendly breathable layer, a far infrared stone needle layer, a knitted heating layer and a heat insulation layer from inside to outside. The knitted heating layer is formed by periodically and alternately weaving conductive silver-plated yarns and acrylic yarns, and copper wire electrodes embedded in the two sides are combined to form a parallel conductive network, so that uniform planar heating is realized. The far-infrared stone needle layer loads 200-400-mesh stone needle powder, the far-infrared stone needle layer is adjacent to the heating layer to efficiently absorb heat, release far-infrared radiation and play a role in heat storage and slow release, and in cooperation with a built-in lithium battery power supply and hook-and-loop fastener adjusting structure, the device can stably maintain safe hot compress at the temperature of 40-45 DEG C, neck fatigue is effectively relieved, and physical therapy convenience and comfort are improved.

Description

Technical Field

[0001] This invention relates to the field of wearable physiotherapy and thermal products, specifically to a planar electrically heated neck brace based on a Bianstone-knitted composite layer and its preparation method. Background Technology

[0002] With prolonged desk work, increased use of electronic devices, and a growing number of people suffering from cervical strain, wearable products for neck physiotherapy and warmth are gradually becoming an important part of the health care field. Currently, common neck support devices on the market mainly provide passive warmth to the neck through insulating materials, or achieve local heat application through heating elements such as heating wires and heating films to relieve neck muscle fatigue and promote local blood circulation.

[0003] Existing electrically heated neck supports typically use resistance wires, carbon fiber heating wires, or flexible heating films as heating units, embedding them into layers of fabric or foam to form the heating structure. However, these structures still have some shortcomings in practical use. For example, traditional resistance wires or linear heating structures are usually linearly distributed, making it difficult to form a uniform and stable planar heat field in the neck area, easily leading to problems such as localized overheating or uneven heating; while some heating film structures can achieve planar heating, their flexibility and breathability are poor, their integration with textile materials is limited, and their comfort is insufficient during prolonged wear. In addition, existing products mostly focus on the single function of electric heating and warmth, with limited overall improvement in the therapeutic effect on the human body.

[0004] On the other hand, Bian stone materials are widely used in traditional Chinese medicine physiotherapy due to their far-infrared radiation and good thermal conductivity. Bian stone can release far-infrared energy when heated, and through thermal conduction and radiation, it produces certain auxiliary therapeutic effects on the human body. However, most existing Bian stone therapy products use solid block or granular filling structures, usually requiring external heating equipment or hot compresses for use. This makes it difficult to integrate well with flexible wearable structures and to create a stable and controllable continuous heating environment.

[0005] Furthermore, in the field of wearable heated textiles, knitted structures are considered an important method for constructing flexible heating structures due to their excellent softness, stretchability, and breathability. By arranging conductive yarns within the knitted structure, an electrothermal network with a certain planar distribution can be formed, thereby achieving a relatively uniform heating effect. However, a mature technical solution is still lacking for effectively combining knitted planar electrothermal structures with Bianstone therapy materials to form a multi-layered composite structure suitable for neck wear, while ensuring flexibility, comfort, and safety.

[0006] In view of this, the present invention proposes a planar electrically heated neck brace based on a Bian stone-knitted composite layer and its preparation method. Summary of the Invention

[0007] The purpose of this invention is to provide a planar electric heating neck brace based on a Bian stone-knitted composite layer and its preparation method. This invention aims to solve the problems that existing electric heating neck brace products mostly use linear heating units, which make it difficult to form a uniform and stable planar heat field, and are difficult to effectively combine with Bian stone therapy materials, resulting in insufficient therapeutic effect and wearing comfort.

[0008] In a first aspect, the present invention provides a planar electrically heated neck brace based on a Bianstone-knitted composite layer, comprising:

[0009] It includes a neck brace body and a power assembly integrated at one end thereto, the power assembly including a lithium battery, a switch and a USB interface;

[0010] The neck brace body consists of a skin-friendly and breathable layer, a far-infrared Bianstone layer, a knitted heating layer, and a heat insulation layer, which are stacked and fixed from the inside out.

[0011] The knitted heating layer is made of conductive yarn and heat-insulating yarn woven alternately in a periodic manner, and oxygen-free copper wires are embedded longitudinally on both sides of the knitted heating layer as electrodes. The oxygen-free copper wires are electrically connected to the conductive yarns and connected to the power supply component to form a planar heating network.

[0012] The far-infrared Bianstone layer includes a flexible substrate and Bianstone powder loaded on the surface of the flexible substrate. The far-infrared Bianstone layer is disposed adjacent to the knitted heating layer to receive the Joule heat generated therefrom and release far-infrared radiation.

[0013] As a preferred technical solution of the first aspect of the present invention, the far-infrared Bianstone layer is a sandwich structure formed by hot pressing process. The Bianstone powder is encapsulated between two hot melt adhesive linings that serve as flexible substrates. The Bianstone powder is fixed between layers by melting and penetrating the hot melt adhesive.

[0014] As a preferred technical solution of the first aspect of the present invention, the far-infrared Bianstone layer is a coating structure, wherein the Bianstone powder is mixed with an adhesive to form a slurry and coated on the surface of the flexible substrate to form a Bianstone coating, and an adhesive liner is covered on the outside of the Bianstone coating for encapsulation and fixation.

[0015] As a preferred embodiment of the first aspect of the present invention, the knitted heating layer has a 1×1 rib knit structure; the conductive silver-plated yarn has a specification of 70 tex and a length resistivity of 0.264 Ω·(10cm)-1.

[0016] As a preferred embodiment of the first aspect of the present invention, the neck brace body has a fixing structure at both ends, the fixing structure includes a fixed end and a movable end, the fixed end is located on the inner side of one end of the neck brace body, and the movable end is located on the outer side of the other end of the neck brace body; the edge of the neck brace body is provided with an edge banding strip.

[0017] In a second aspect, the present invention provides a method for preparing a planar electrically heated neck brace based on a Bianstone-knitted composite layer, used to manufacture the first aspect, comprising the following steps:

[0018] Using a computer flat knitting machine program, the conductive yarn and the heat-insulating yarn are arranged alternately in a 1:1 ratio in the horizontal direction. During the knitting process, oxygen-free copper wires are longitudinally embedded on both sides of the knitted heating layer (4) through program control, so that the oxygen-free copper wires and the conductive yarns are in direct contact to form a parallel conductive network.

[0019] Bianstone powder with a particle size of 200-400 mesh is loaded onto a hot-melt flexible substrate; the flexible substrate is made sticky through a heat treatment process, thereby achieving semi-enclosed or sandwich-type encapsulation of the Bianstone powder.

[0020] The skin-friendly breathable layer, far-infrared Bianstone layer, knitted heating layer and heat insulation layer are stacked from the inside to the outside according to the optimal heat utilization efficiency path, and the layers are fixed by sewing or hot pressing.

[0021] A power assembly containing a lithium battery, switch, and USB interface is installed at one end of the neck brace body; the edges of the neck brace body are tightly stitched with binding strips.

[0022] As a preferred technical solution of the second aspect of the present invention, Bianstone powder and adhesive are mixed in proportion to form a slurry, which is then coated on the surface of a flexible substrate. After air drying and curing, a liner of the same specification is applied to the outside of the coating for sealing.

[0023] As a preferred technical solution of the second aspect of the present invention, the far-infrared Bianstone layer is constructed by a hot-pressing sandwich process: dry Bianstone powder is evenly spread between two hot-melt adhesive linings and then hot-pressed, using hot-melt adhesive to melt, penetrate and encapsulate the Bianstone powder, and after cooling and solidification, an integrated structure is formed.

[0024] As a preferred technical solution of the second aspect of the present invention, the far-infrared Bianstone layer is constructed by a coating-encapsulation process: Bianstone powder is mixed with water-based environmentally friendly adhesive to form a slurry and coated on the surface of a flexible substrate to form a Bianstone coating. After air drying and curing, an adhesive liner is then laminated on the outside of the Bianstone coating.

[0025] As a preferred technical solution of the second aspect of the present invention, by controlling the thermal conductivity of the heat insulation layer fabric to be ≤0.035W / (m·K), the Joule heat generated by the knitted heating layer is directed to the far-infrared Bianstone layer side, so that the surface temperature of the far-infrared Bianstone layer is stably maintained at 38-42℃.

[0026] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0027] This invention utilizes a knitted heating layer formed by an alternating network of conductive silver-plated yarn and acrylic yarn to generate uniform Joule heat under lithium battery power, providing a stable initial heat source for physiotherapy. Because the far-infrared Bianstone layer is positioned adjacent to the heating layer, this tight coupling between the physical layers allows for efficient heat conduction to the Bianstone powder, inducing the release of high-density far-infrared radiation. This far-infrared energy, combined with the unique heat storage and slow-release properties of Bianstone, promotes uniform and deep penetration of heat into the neck soft tissues. Ultimately, this leads to a significant improvement in local blood circulation, effectively relieving muscle tension and neck stiffness caused by prolonged desk work or looking down. Simultaneously, the outer heat-insulating layer further ensures directional energy delivery towards the neck by preventing heat loss, significantly improving heat utilization efficiency and the sustainability of the therapeutic effect. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0029] Figure 1 This is a schematic diagram of the overall structure of the neck brace of the present invention;

[0030] Figure 2 This is a schematic diagram of the connection structure between the knitted heating layer and the circuit assembly of the present invention;

[0031] Figure 3 This is a schematic diagram of the knitted structure of the knitted heating layer of the present invention;

[0032] Figure 4 This is a schematic diagram of the knitting process of the heating layer of the present invention;

[0033] Figure 5 This is a schematic diagram illustrating the manufacturing process of the far-infrared Bianstone layer of the present invention;

[0034] Figure 6 This is a partial cross-sectional schematic diagram of the neck brace body of the present invention;

[0035] Figure 7This is a flowchart illustrating the preparation method of the planar electrically heated neck brace of the present invention.

[0036] In the diagram: 1. Neck brace body; 2. Skin-friendly and breathable layer; 3. Far-infrared Bianstone layer; 31. Bianstone powder; 32. Adhesive; 33. Bianstone coating; 34. Flexible substrate; 4. Knitted heating layer; 41. Oxygen-free copper wire; 42. Conductive yarn; 43. Warm yarn; 5. Heat insulation layer; 6. Lithium battery; 7. Switch; 8. USB interface; 9. Velcro hook side; 10. Velcro fleece side; 11. Binding strip. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0038] Throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The described embodiments are only a part of the embodiments of this application, not all of them. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0039] Example 1

[0040] like Figure 1 As shown, this embodiment provides a planar electric heating neck brace based on a Bian stone-knitted composite layer, including a neck brace body 1. The neck brace body 1 is provided with a skin-friendly and breathable layer 2, a far-infrared Bian stone layer 3, a knitted heating layer 4, and a heat insulation layer 5 from the inside to the outside. Each layer is stacked along the length of the neck brace and fixed by sewing or bonding.

[0041] The skin-friendly and breathable layer 2 is located on the inner side of the neck brace body 1 and comes into contact with the skin of the neck. The skin-friendly and breathable layer 2 is made of cotton-ammonia blend jacquard openwork knitted fabric, which has both a soft and skin-friendly feel and good breathability and sweat-wicking effect. It can avoid the neck from feeling stuffy and sticky when worn for a long time and is suitable for direct contact with the neck skin.

[0042] The far-infrared Bianstone layer 3 is disposed on the outside of the skin-friendly breathable layer 2, and is fixed to the skin-friendly breathable layer 2 by sewing. It is also arranged adjacent to the outer knitted heating layer 4, serving to receive the heat generated by the knitted heating layer 4 and produce far-infrared radiation, ensuring efficient heat transfer. The far-infrared Bianstone layer 3 can be formed using two processes, as detailed below:

[0043] In one embodiment, a coating-encapsulation molding process is adopted: the far-infrared Bianstone layer 3 is composed of Bianstone powder 31, water-based environmentally friendly adhesive 32, Bianstone coating 33 and adhesive backing 34, wherein the particle size of Bianstone powder 31 is 200-400 mesh, Bianstone powder 31 and water-based environmentally friendly adhesive 32 are mixed to form a slurry and coated on the surface of flexible substrate 34, dried and cured to form Bianstone coating 33, and then encapsulated by flexible substrate 34 to form a stable structure;

[0044] For example, a hot-melt adhesive liner is selected as the flexible substrate 34, which has the characteristics of being thin, soft and flexible, and adaptable to wearable needs. After pretreatment, 200-400 mesh Bianstone powder 31 is mixed with water-based environmentally friendly adhesive 32 in a predetermined ratio to form a uniform slurry. The uniform slurry is coated on the surface of the flexible substrate 34 and air-dried to form a Bianstone coating 33. In order to prevent the powder from falling off during use, an adhesive liner of the same specification is covered and sealed on the outside of the Bianstone coating 33, and finally a three-layer stable structure of "adhesive liner substrate - Bianstone functional layer - adhesive liner encapsulation layer" is formed.

[0045] In another embodiment, a hot-press sandwich molding process is used: the far-infrared Bianstone layer 3 is prepared by a sandwich structure, with Bianstone powder 31 laid between two flexible substrates 34, and a sealed sandwich structure is formed after hot pressing.

[0046] For example, two layers of hot-melt adhesive backing are selected as the upper and lower flexible substrates 34 for support. Dry 200-400 mesh Bianstone powder 31 is evenly spread on the surface of the lower flexible substrate 34, and then covered with the upper flexible substrate 34 and hot-pressed. Hot-melt adhesive is used to melt, penetrate and encapsulate the Bianstone powder 31. After cooling and curing, the sandwich structure is fixed and integrated. This process does not require additional adhesive and is simple to operate.

[0047] The knitted heating layer 4 is disposed on the outside of the far-infrared Bianstone layer 3. It is formed by knitting conductive yarn 42 and heat-insulating yarn 43 on a knitting machine to form a planar heating structure. The conductive yarn 42 is silver-plated yarn, and the heat-insulating yarn 43 is acrylic yarn. The specification of the silver-plated yarn 42 is 70 tex. After testing, its length resistivity is 0.264 Ω·(10cm)-1. The maximum load current of 10cm length of silver-plated yarn is 1.031A, and the corresponding safe working voltage is 3.05V. The specification of the acrylic yarn 43 is 12.15 tex. It has good warmth retention and heat storage performance, which can help maintain the temperature stability of the heating layer and reduce heat loss.

[0048] Conductive yarn 42 and insulating yarn 43 are arranged alternately in the transverse direction to form a conductive network. To ensure power supply stability, oxygen-free copper wire 41 is embedded at both edges of the knitted heating layer 4. The oxygen-free copper wire 41 is electrically connected to the conductive yarn 42 to form power supply electrodes, thereby forming a parallel conductive structure, effectively reducing circuit resistance fluctuations and achieving uniform heating.

[0049] The heat insulation layer 5 is disposed on the outside of the knitted heating layer 4. The heat insulation layer 5 is made of neoprene fabric with a thickness of 2mm and a thermal conductivity ≤0.035W / (m·K), exhibiting excellent heat insulation performance. The heat insulation layer 5 is fixed to the knitted heating layer 4 by sewing. Its function is to reduce heat loss to the outside of the neck brace during heating, allowing more of the heat generated by the knitted heating layer 4 to act on the far-infrared Bianstone layer 3, improving heat utilization efficiency, enhancing the overall warmth retention of the neck brace, maintaining a stable therapeutic temperature, and ensuring the continuity of the therapeutic effect.

[0050] The power supply component is electrically connected to the knitted heating layer 4 and is integrated on the outer side of one end of the neck brace body 1. The power supply component includes a built-in lithium battery 6, a switch 7 for controlling power on and off, and a USB interface 8 for charging the lithium battery. The lithium battery 6 is a polymer lithium battery with a specification of 5V / 1000mAh and has overcharge, over-discharge, and overcurrent protection functions.

[0051] Actual testing showed that, when powered by lithium battery 6, the surface temperature of the knitted heating layer 4 was stable at 40-45℃. This temperature range is within the safe range for human body heat therapy, avoiding the risk of burns. The heat generated can be quickly transferred to the adjacent far-infrared Bianstone layer 3 through heat conduction, keeping the surface temperature of the Bianstone layer stable at 38-42℃ and stimulating the far-infrared radiation function of the Bianstone.

[0052] The neck brace body 1 has a fixing structure at both ends. The fixing structure includes a fixed end and a movable end. The fixed end is located on the inner side of one end of the neck brace body 1, and the movable end is located on the outer side of the other end of the neck brace body 1, so as to realize the adjustable fixing of the neck brace.

[0053] The preferred fastening structure is a Velcro fastening structure, which is located at both ends of the neck brace body 1. It includes a Velcro hook surface 9 and a Velcro fleece surface 10. The Velcro hook surface 9 is sewn to the inside of one end of the neck brace, and the Velcro fleece surface 10 is sewn to the outside of the other end. The effective adhesion length between the Velcro hook surface 9 and the Velcro fleece surface 10 is 8cm, and the tightness can be flexibly adjusted according to the wearer's neck circumference.

[0054] The neck brace body 1 is provided with a nylon edging strip 11 at its edge. The nylon edging strip 11 is fixed to the edge of the neck brace body 1 by sewing to improve structural strength and prevent fabric edge wear.

[0055] For example, the edge of the neck brace body 1 is edged with a 1cm wide nylon edging strip 11 and fixed by a close overlock stitching process, which not only enhances the overall structural strength of the neck brace and prevents edge wear, but also improves the aesthetics of wearing it.

[0056] When the neck brace is in operation, the lithium battery 6 supplies power to the knitted heating layer 4 through the switch 7. The current passes through the conductive yarn 42 to form a distributed conductive network and generate Joule heat, causing the knitted heating layer 4 to form a planar heating structure. The generated heat is transferred to the far-infrared Bianstone layer 3 through thermal conduction, which raises the temperature of the far-infrared Bianstone layer 3 and releases far-infrared radiation, thereby achieving the effect of heat therapy on the neck area of ​​the human body.

[0057] Example 2

[0058] like Figure 7 As shown, this embodiment provides a method for preparing a planar electrically heated neck brace based on a Bianstone-knitted composite layer, including the following steps:

[0059] Step S1: Prepare the skin-friendly and breathable layer 2

[0060] A cotton-spandex blend jacquard openwork knitted fabric is selected and cut to the required size according to the length and width of the neck brace, forming a skin-friendly and breathable layer 2 on the inner side of the neck brace that directly contacts the neck skin. This layer is fixed by sewing or pressing, providing a soft support base for subsequent functional layers.

[0061] Step S2: Construct far-infrared Bianstone 3

[0062] (1) Coating-encapsulation molding process: The hot melt adhesive backing 34 is used as a flexible substrate. A slurry made of 200-400 mesh Bianstone powder 31 and water-based environmentally friendly adhesive 32 is uniformly coated on the substrate surface. The slurry is air-dried and cured to form Bianstone coating 33. Then, the adhesive backing 34 is laminated and encapsulated to form a stable composite layer.

[0063] (2) Hot-press sandwich molding process: Dry Bianstone powder 31 is evenly spread between two hot-melt adhesive linings 34. The hot-press process melts the hot-melt adhesive lining and wraps the Bianstone powder. After cooling and solidification, an integrated Bianstone sandwich is formed.

[0064] Step S3: Prepare the knitted heating layer 4

[0065] A planar heating structure is formed by weaving conductive yarn 42 and acrylic yarn 43 on a knitting machine according to a predetermined weaving scheme. Oxygen-free copper wires 41 are embedded on both sides of the knitted heating layer 4 as power supply electrodes. The copper wires are directly electrically connected to the conductive yarn 42 to form a uniform parallel conductive network.

[0066] Step S4: Composite layer stacking

[0067] The skin-friendly and breathable layer 2 prepared in step S1, the far-infrared Bianstone layer 3 prepared in step S2, and the knitted heating layer 4 prepared in step S3 are stacked in sequence from the inside to the outside and fixed by sewing or hot pressing to ensure that each functional layer is tightly attached and to ensure efficient transfer of heat and far-infrared energy.

[0068] Step S5: Install thermal insulation layer 5

[0069] A heat insulation layer 5 is superimposed on the outside of the knitted heating layer 4. It is made of 2mm thick neoprene fabric and is fixed by sewing to reduce heat loss to the outside, improve heat utilization efficiency and overall warmth retention.

[0070] Step S6: Install the power supply assembly

[0071] A power supply assembly is provided at one end of the neck brace body 1, including a lithium battery 6, a power switch 7 and a USB charging interface 8. The lithium battery 6 is electrically connected to the knitted heating layer 4 to provide a stable power supply to the heating layer.

[0072] Step S7: Install the fixing structure and perform edge treatment

[0073] Hook and loop fasteners 9 and hook and loop fastener fleece 10 are sewn at both ends of the neck brace, and nylon binding strips 11 are wrapped around the edge of the neck brace. The structural strength is improved and the wearing tightness can be adjusted by sewing.

[0074] The neck brace prepared through the above steps has a knitted heating layer 4 forming a uniform planar heating structure, a far-infrared Bianstone layer 3 releasing far-infrared radiation when heated, a skin-friendly and breathable layer 2 providing soft and comfortable contact, a heat insulation layer 5 improving heat utilization efficiency, a power supply component realizing heating control, and a fixing structure providing wearing adjustment and structural stability, thus forming a wearable heat therapy neck brace.

[0075] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A planar electrically heated neck brace based on a Bianstone-knitted composite layer, characterized in that: It includes a neck brace body (1) and a power assembly integrated at one end thereto, the power assembly including a lithium battery (6), a switch (7) and a USB interface (8). The neck brace body (1) is composed of a skin-friendly and breathable layer (2), a far-infrared Bianstone layer (3), a knitted heating layer (4), and a heat insulation layer (5) stacked and fixed from the inside to the outside. The knitted heating layer (4) is made of conductive yarn (42) and warm yarn (43) woven alternately in a periodic manner, and oxygen-free copper wire (41) is embedded longitudinally on both sides of the knitted heating layer (4) as electrodes. The oxygen-free copper wire (41) is electrically connected to the conductive yarn (42) and connected to the power supply assembly to form a planar heating network. The far-infrared Bianstone layer (3) includes a flexible substrate (34) and Bianstone powder (31) loaded on the surface of the flexible substrate (34). The far-infrared Bianstone layer (3) is disposed adjacent to the knitted heating layer (4) to receive the Joule heat generated therefrom and release far-infrared radiation.

2. The planar electric heating neck brace based on a Bianstone-knitted composite layer according to claim 1, characterized in that: The far-infrared Bianstone layer (3) is a sandwich structure formed by hot pressing. The Bianstone powder (31) is encapsulated between two hot-melt adhesive linings that serve as flexible substrates (34). The Bianstone powder (31) is wrapped by hot-melt adhesive to achieve interlayer fixation.

3. The planar electric heating neck brace based on a Bianstone-knitted composite layer according to claim 1, characterized in that: The far-infrared Bianstone layer (3) is a coating structure. The Bianstone powder (31) is mixed with the adhesive (32) to form a slurry and coated on the surface of the flexible substrate (34) to form a Bianstone coating (33). The outer side of the Bianstone coating (33) is covered with an adhesive liner for sealing and fixing.

4. The planar electric heating neck brace based on a Bianstone-knitted composite layer according to claim 1, characterized in that: The knitted heating layer (4) has a 1×1 rib knit structure; the conductive silver-plated yarn (42) has a specification of 70 tex and a length resistivity of 0.264 Ω·(10cm)-1.

5. The planar electric heating neck brace based on a Bianstone-knitted composite layer according to claim 1, characterized in that: The neck brace body (1) has a fixing structure at both ends. The fixing structure includes a fixed end and a movable end. The fixed end is located on the inner side of one end of the neck brace body (1), and the movable end is located on the outer side of the other end of the neck brace body (1). The edge of the neck brace body (1) is provided with an edge band (11).

6. A method for preparing a planar electrically heated neck brace based on a Bianstone-knitted composite layer, used to manufacture the planar electrically heated neck brace based on a Bianstone-knitted composite layer as described in any one of claims 1-5, characterized in that: Includes the following steps: Using a computer flat knitting machine program, the conductive yarn (42) and the heat-insulating yarn (43) are arranged alternately in a 1:1 ratio in the horizontal direction. During the knitting process, oxygen-free copper wires (41) are longitudinally embedded on both sides of the knitted heating layer (4) through program control, so that the oxygen-free copper wires (41) and the conductive yarn (42) directly contact each other to form a parallel conductive network. Bianstone powder (31) with a particle size of 200-400 mesh is loaded onto a hot-melt flexible substrate (34); the flexible substrate (34) is made sticky by heat treatment process, thereby realizing the semi-enclosed or sandwich-type encapsulation of Bianstone powder (31). The skin-friendly breathable layer (2), far-infrared Bianstone layer (3), knitted heating layer (4) and heat insulation layer (5) are stacked from the inside to the outside according to the optimal heat utilization efficiency path, and the layers are fixed by sewing or hot pressing. A power assembly containing a lithium battery (6), a switch (7) and a USB interface (8) is installed at one end of the neck brace body (1); the edges of the neck brace body (1) are tightly stitched with an edge banding strip (11).

7. The method for preparing a planar electrically heated neck brace based on a Bianstone-knitted composite layer according to claim 6, characterized in that: Bianstone powder (31) and adhesive (32) are mixed in proportion to form a slurry, which is then coated onto the surface of a flexible substrate (34). After air drying and curing, the coating is sealed with an adhesive liner of the same specification.

8. The method for preparing a planar electrically heated neck brace based on a Bianstone-knitted composite layer according to claim 6, characterized in that: The far-infrared Bianstone layer (3) is constructed using a hot-press sandwich process: dry Bianstone powder (31) is evenly spread between two hot-melt adhesive linings and then hot-pressed. Hot-melt adhesive is used to melt, penetrate and encapsulate the Bianstone powder (31), and after cooling and solidification, an integrated structure is formed.

9. The method for preparing a planar electrically heated neck brace based on a Bianstone-knitted composite layer according to claim 6, characterized in that: The far-infrared Bianstone layer (3) is constructed using a coating-encapsulation process: Bianstone powder (31) is mixed with water-based environmentally friendly adhesive (32) to form a slurry and coated on the surface of a flexible substrate (34) to form a Bianstone coating (33). After air drying and curing, an adhesive liner is then applied to the outside of the Bianstone coating (33).

10. The method for preparing a planar electrically heated neck brace based on a Bianstone-knitted composite layer according to claim 6, characterized in that: By controlling the thermal conductivity of the heat insulation layer (5) to be ≤0.035W / (m·K), the Joule heat generated by the knitted heating layer (4) is directed to the far-infrared Bianstone layer (3), so that the surface temperature of the far-infrared Bianstone layer (3) is stably maintained at 38-42℃.

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