Electric heating product, and fixing structure and fixing method for electric heating wire

Abstract

In response to the technical problems in the prior art of a fixing structure for an electric heating wire of an electric heating product being prone to causing the heating wire of the electric heating product to tangle and it being impossible to realize automatic wiring, provided in the present invention are an electric heating product, and a fixing structure and fixing method for an electric heating wire. The fixing structure for an electric heating wire comprises a binding strip / tape and a sewing thread, wherein the two ends of the binding strip / tape in the width direction form flaps, the two flaps are arranged opposite each other to form a channel for accommodating an electric heating wire, and the sewing thread is arranged in the overlapping part of the two flaps in the length direction of the binding strip / tape. By using the fixing structure and fixing method for an electric heating wire based on the structure in the present invention, an electric heating wire can be integrally fixed on a heating product body, the heating wire is not easily tangled, and fully automated production can be realized.

Description

Fixing structure and fixing method of electric heating products and electric heating wires Technical Field

[0001] This invention belongs to the field of electric heating product technology, specifically relating to an electric heating product, a fixing structure for electric heating wire, and a fixing method. Background Technology

[0002] Traditional electric heating products, such as electric blankets and electric under-bed blankets, have been a part of people's lives for many years. As winter heating products, they are widely used due to their advantages of being clean, convenient, temperature-adjustable, and environmentally friendly. With the improvement of people's living standards, higher demands have been placed on winter heating, leading to the introduction of more new electric heating products into the market. These include electric heating products that can be worn directly for warmth, such as electric blankets and electric shawls. Because they are convenient and warm when worn directly, they are very popular in colder regions like Europe and America.

[0003] As electric heating products are shifting towards being used in clothing, the requirements for these products have also changed significantly. They now require not only to be lightweight, comfortable, and warm, but also to meet higher standards in terms of safety, cleanability, and suitability for use. Technical issues

[0004] Taking electrically heated shawls and blankets as examples, because they come into direct contact with the body and require frequent washing, the water resistance of these products is crucial; they must not deform or come undone after washing. Since they are worn directly, electrically heated shawls and blankets are not handled with the same care as traditional electrically heated blankets, and are often moved, folded, crumpled, or piled up. Therefore, the heating wires in these products are prone to tangling, which can easily lead to safety accidents. To prevent such accidents, the industry typically incorporates safety control circuits to ensure the safety of electrically heated products. When the heating wires become tangled, the safety control circuit activates and cuts off the power, rendering the product unusable. Within the warranty period, the manufacturer is responsible for the loss, and consumers can return the product at any time. Currently, however, the fixed structure used to secure the heating wires makes them highly susceptible to tangling after a period of wear or washing. This results in high return rates and high production and service costs for manufacturers and distributors. As shown in Figure 1-2, the existing electric heating wire fixing structure is as follows: It includes two substrates 10, with multiple sets of parallel quilted lines 15 arranged on the substrates according to the wiring path of the electric heating wire. Each set of quilted lines includes two parallel straight lines, forming a channel through which the electric heating wire passes. The electric heating wire 11 meanders through the channel 17 and is fixed between the two substrates by interlacing, i.e., the electric heating wire alternately passes through each channel 17 in a serpentine manner and is distributed between the two substrates. To fix the portion of the electric heating wire located at the open ends, adhesive tape is used to attach the heating wire. While it is initially fixed, it often comes off after washing. Furthermore, the tape is applied manually, and it cannot be guaranteed that each channel is firmly attached, resulting in missed areas. After washing, it offers no constraint on the heating wire.This fixing method has the following drawbacks: When the heating wire passes through the channel formed by two adjacent sets of quilted threads, it follows an arc shape. Due to the difficulty in processing this arc-shaped section, it cannot be sewn together using quilting. Therefore, the heating wire actually transitions freely in this part, without any fixing structure to secure it. For ease of threading, the distance between the two quilted threads forming the channel is relatively large, giving the heating wire a high degree of freedom. Therefore, during dynamic wear or washing, the heating wire will shift, and the arc-shaped segment between two adjacent channels will not maintain the intended route. Instead, one end will have a longer wire, and the other end will have a shorter wire, with more wires on one end... The heating wire is prone to knotting under dynamic conditions. The shorter end can cause substrate aggregation and wrinkles. Furthermore, because the channel width is much wider than the diameter of the heating wire, the wire is also prone to knotting during movement within the channel. Knotted heating wires lead to abnormal product operation, which can cause various malfunctions, such as overheating and burns; prolonged use under abnormal conditions may cause circuit malfunctions, leading to burnout, fires, personal injury, and property damage; or even product self-destruction. Heating wire knotting is a significant risk factor for electric heating products. Knotting renders the product unusable, resulting in a persistently high return rate, accounting for 4-5% of total product returns annually. Therefore, knotted heating wires are something all manufacturers strive to avoid. Furthermore, with the aforementioned fixed structure, setting the quilting thread and threading are completed separately, representing two distinct processes. Generally, manual threading is used. While imported automatic threading machines exist, the inability to automate the connection between these two processes prevents complete automation of the electric heating wire fixing process, resulting in low overall industry production efficiency. The inability to fully automate threading is a bottleneck in this industry. In response to this problem, in October 2023, the Electric Heating Blanket and Electric Heating Underlay Committee of the China Household Electrical Appliances Association proposed an industry task. Led by the Association, a research and development group for automated wiring technology for electric heating blankets and electric heating underlays was established, bringing together leading industry enterprises to develop new products to improve automation levels. The group proposed the development of electric heating composite and adhesive composite technologies. However, after a year of practice, the results were not significant. This issue was clearly recorded in the minutes of the 2024 annual meeting of the China Household Electrical Appliances Association (China Household Electrical Appliances Association Special Document

[2024] No. 24). Technical solutions

[0005] The purpose of this invention is to address the technical problem that the fixing structure of the heating wire in existing electric heating products easily causes the heating wire to become knotted and cannot achieve automated wiring, and to provide a fixing structure and fixing method for electric heating products and heating wires.

[0006] The following technical solution was specifically adopted:

[0007] A fixing structure for an electric heating wire includes a binding strip / band and a sewing thread. The two ends of the binding strip / band in the width direction form wrapping wings. The two wrapping wings are arranged opposite each other to form a channel for accommodating the electric heating wire. The sewing thread is arranged along the length direction of the binding strip / band at the overlapping part of the two wrapping wings.

[0008] Furthermore, the stitching is used to sew the two overlapping wings together with the main body of the electric heating product that holds the electric heating wire; and / or there is one or more stitchings, and when there are two or more stitchings, the stitchings are arranged in parallel; and / or the binding strip / band is a binding fabric strip; and / or the channel is a complete channel without gaps in the length direction; and / or the electric heating wire is tightly wrapped by the binding strip / band.

[0009] An electric heating product includes an electric heating product body, the electric heating product body including at least one surface layer and / or at least one substrate, an electric heating wire fixed to the electric heating product body by a fixing structure, the fixing structure being the electric heating wire fixing structure described in any of the preceding claims, the binding strip / band being fixedly connected to the surface layer and / or substrate by the seam, and the electric heating wire being wrapped in the channel and extending through the length of the channel.

[0010] Furthermore, the electric heating product includes a first surface layer, a second surface layer, and a substrate, with the substrate sandwiched between the first and second surface layers, and the electric heating wires fixedly connected to the substrate through a fixing structure.

[0011] Furthermore, it also includes a wiring device, which is fixedly mounted on the body of the electric heating product, and the two ends of the electric heating wire are respectively connected to the positive and negative terminals of the wiring device.

[0012] Furthermore, the electric heating wires are arranged as a whole or in sections on the substrate or surface, and / or the wiring path of the electric heating wires consists of multiple parallel straight lines connected end to end, with each straight line connected end to end by an arc line.

[0013] Furthermore, the first and second outer layers are respectively one of fleece, linen, or woven fabric, and / or the substrate and the binding strip / tape are respectively one of non-woven fabric, polyester fabric, or polyester-cotton fabric, and / or the electric heating product is an electric heating clothing product, which is any one of electric heating blanket, electric heating undershirt, electric heating shawl, electric heating thermal underwear, electric heating thermal outerwear, or electric heating thermal pants; or the electric heating product is an electric heating product, which is any one of electric heating mattress, electric heating pad, electric heating blanket, or electric heating undershirt; or the electric heating product is an electric heating outdoor product, which is any one of electric heating tent or electric heating shed.

[0014] Furthermore, the wiring device is connected to the power plug via a power cord, and a controller is configured on the power cord.

[0015] A method for fixing an electric heating wire involves aligning the electric heating wire and a binding strip / band along their length, folding the two ends of the binding strip / band in the width direction to overlap and form wings covering the electric heating wire, and sewing the two wings of the binding strip / band with the electric heating wire in place, so that the electric heating wire is located within the channel formed by the two wings. The binding strip / band with the electric heating wire in place is then fixed to the substrate and / or surface of the electric heating product via its wings. Alternatively, the electric heating wire and the binding strip / band are aligned along their length, folding the two ends of the binding strip / band in the width direction to overlap and form wings covering the electric heating wire, and sewing the two wings of the binding strip / band with the electric heating wire in place to the substrate or surface of the electric heating product, so that the electric heating wire is located within the channel formed by the two wings and fixed to the substrate and / or surface.

[0016] Furthermore, the two ends of the electric heating wire are fixedly connected to the substrate and / or surface layer through a junction box. Beneficial effects

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The electric heating wire fixing structure and method of this invention involves wrapping the electric heating wire along the length of a binding strip / band, ensuring the binding strip / band covers the entire length of the heating wire. A seam is placed on one side of each of the two wings, creating a channel for the electric heating wire. The entire heating wire is fixed by the binding strip / band. By fixing the binding strip / band to the surface and / or substrate of the electric heating product, the entire heating wire can be firmly and reliably fixed to the product body. This structure, because the seam is only placed at one opening formed by the two wings, allows for simultaneous wrapping and fixing of the heating wire during processing. The heating wire is fixed to the heating product body by using a seam-sealing strip / seamless method. This eliminates the need for threading the heating wire, reduces processing steps, and automates the fixing of the heating wire, greatly improving production efficiency. It solves the long-standing technical problem of low efficiency and lack of automation in threading heating wires, achieving unexpected technical results. The fixing structure of this invention can be directly fixed to the substrate and then connected to the surface layer, or the surface layer and substrate can be sewn together. Therefore, it is highly adaptable and can adopt different fixing methods for different needs, which is conducive to automating the fixing of heating wires using ordinary equipment.

[0019] In the electric heating product using the structure of this invention, the electric heating wire is fixed to the heating product body by a fixing structure consisting of a binding strip / tape and a sewing thread. Within the range connected to the heating product body, the fixing between the two is along the entire length of the electric heating wire, ensuring that the electric heating wire is completely fixed to the heating product body. Therefore, the heating product remains integrated with the heating product body regardless of whether it is rubbed, rolled up, or washed, without misalignment or knotting. When the electric heating wire is fixed to the heating product body, a sewing thread is only set on one side of the electric heating wire. The thread routing path is unrestricted and can be completed in one machining operation, greatly reducing processing difficulty and improving production efficiency. The electric heating wire can be set on the surface or the substrate as needed for the electric heating product, meeting the requirements of different heating products.

[0020] The method and fixing structure of this invention secure the electric heating wire and the electric heating product. By using binding strips / tapes and stitching, the entire electric heating wire is fixed in a defined position, allowing for highly regular and uniform wiring, ensuring consistent product processing and contributing to the control of product appearance and stitching quality. Compared to existing technologies that use quilting to fix the heating wire, where the wire is merely clamped between two quilted threads without true fixation and prone to displacement, the method and fixing structure of this invention secures the heating wire from beginning to end within the binding strips / tapes, and fixes both ends of the heating wire with the strips / tapes and stitching. This ensures the entire heating wire is fixed in a defined position, preventing it from shifting out from the open openings at both ends of each channel. Therefore, the structural design effectively avoids the occurrence of knots in the heating wire. Attached Figure Description

[0021] Figure 1 is a schematic diagram of the structure of an existing electric heating product;

[0022] Figure 2 is a magnified view of a partial cross-section at point A in Figure 1.

[0023] Figure 3 is a schematic diagram of the structure of an embodiment of the electric heating product of the present invention, wherein the main body of the electric heating product is represented by an exploded view.

[0024] Figure 4 is a magnified view of a partial cross-section at point A in Figure 2, showing the fixing structure of one embodiment.

[0025] Explanation of reference numerals in the attached figures

[0026] 1-Electric heating product body, 10-Substrate, 11-Electric heating wire, 12-First surface layer, 13-Second surface layer; 14-Seam wrapping strip / tape, 15-Sewing thread, 16-Wrapping wing, 17-Channel, 18-Fixing structure, 21-Power plug, 22-Controller, 23-Gateway box. The best embodiment of the present invention

[0027] Type the description paragraph of the best embodiment of the invention here. Embodiments of the present invention

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0030] As shown in Figures 3-4, the electric heating product of this embodiment includes an electric heating product body 1 and an electric heating wire 11. The electric heating product body may include only a surface layer, only a substrate 10, or both a surface layer and a substrate. The electric heating wire is fixedly disposed on the electric heating product body by a fixing structure. When the electric heating product body includes only a surface layer, the electric heating wire is fixedly disposed on the surface layer by a fixing structure. When the electric heating product body includes only a substrate, the electric heating wire is fixedly disposed on the substrate by a fixing structure. When the electric heating product body includes both a surface layer and a substrate, the electric heating wire is fixedly disposed on the substrate by a fixing structure. The substrate and the surface layer are fixedly connected. The electric heating wire can also be fixedly disposed on both the substrate and the surface layer simultaneously, with all three components integrated.

[0031] In a common embodiment, the surface layer includes a first surface layer 12 and a second surface layer 13, and the substrate 10 is sandwiched between the first surface layer and the second surface layer and is fixedly connected to the first surface layer and the second surface layer.

[0032] In this invention, the fixing structure includes a binding strip / band 14 that wraps around the heating wire 11, and a sewing thread 15 that sews the open side of the binding strip / band 14 to the body of the electric heating product. The binding strip / band covers the heating wire along its length direction, and forms two wings 16 in its width direction. The two wings overlap and are sewn together with the body of the electric heating product. Alternatively, the two wings 16 of the binding strip / band containing the heating wire can be sewn together first to clamp the heating wire, and then the heating wire can be fixed to the inner and / or outer side of the electric heating product by the two wings. Or, the binding strip / band containing the heating wire can be directly sewn and fixed to the inner and / or outer side of the electric heating product body by the sewing thread and the two wings. This fixing method ensures that the entire length of the heating wire runs through the sealing channel formed by the two wings of the sealing strip / tape. Since it only needs to be fixed with stitching at one of the two wings on each side, the heating wire can be wrapped while the main thread is being laid. Ordinary sewing machines can be used for single-thread or multi-thread stitching, automating the wiring process. Furthermore, dedicated sealing equipment can be used to further improve production efficiency. Because the heating wire is fixed along its entire length and wrapped by the sealing strip / tape, and both ends are fixedly connected to the junction box, which is fixed to the heating product body, the heating wire moves with the fixed heating product body, preventing it from shifting within the sealing channel and eliminating knots. Moreover, the wiring path of the heating wire is unrestricted, allowing for flexible arrangement according to the desired path, eliminating the need for threading and significantly improving production efficiency. This solves a long-standing technical problem that has hindered the industry's development.

[0033] As an optional implementation, the heating wires on the electric heating product body can be arranged as a whole or in sections. When arranged in sections, the heating wires in different sections can have their heating temperatures controlled independently to meet different needs.

[0034] As an optional implementation, the first surface layer 12 and the second surface layer 13 can be made of one of the following: fleece, linen, or woven fabric, depending on the actual needs.

[0035] As an optional implementation, the binding strip / tape can be a binding fabric strip or a binding tape. The stitching can be a single thread or multiple parallel threads.

[0036] Electric heating products can be clothing items such as electric blankets, electric thermal underwear, outerwear, and electric thermal pants, or heating products such as electric mattresses, electric top blankets, and electric bottom blankets. They can also be made into outdoor products such as electric thermal tents.

[0037] Non-woven fabric is generally used as the backing, as it is soft and suitable for clothing. Polyester or polyester-cotton blends can also be used as the backing. The seam tape / stitching is preferably made of non-woven fabric, polyester, or polyester-cotton blend.

[0038] The fixing structure of the present invention can be sewn by hand or by machine. By sewing multiple threads simultaneously by machine, efficiency is improved.

[0039] In a further improved technical solution, the electric heating product also includes a wiring device. The wiring device includes a junction box 23 fixed to the main body 1 of the electric heating product and a power cord connected to the junction box 23. The power cord is equipped with a power plug 21 and a controller 22, which are used for switching the power supply on and off and adjusting the heating level. See Figure 3.

[0040] The fixed structure of the present invention fixes the electric heating wire. The wiring path of the electric heating wire can be circular, meandering serpentine, planar spiral, or a square structure, etc.

[0041] The embodiments of this invention are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this invention should be included within the protection scope of this invention.

[0042] Example 1

[0043] The electrically heated product is an electric heating blanket, consisting of a first surface layer and a second surface layer, with a substrate fixed between them. Its dimensions are 50x60 inches. The surface layer fabric is made of flannel and cotton fleece, while the substrate fabric is non-woven fabric. The heating wire is model 202005025 with a pin density of 5.5mm. The wiring path, as shown in Figure 1, is a meandering serpentine structure where straight lines are connected at both ends by arcs. The washing equipment used is a Whirlpool 3LWTW4840YW1.

[0044] The fixing structure adopts the fixing structure of the present invention, which is wrapped with edge binding strips and then sewn to the substrate with a single line. The edge binding strips are made of non-woven fabric.

[0045] Comparative Example 1

[0046] The fixed structure has two substrates, and heating wire channels are stitched on the two substrates by quilting. The heating wires are threaded through the heating wire channels. The other components, such as the first surface layer, the second surface layer, the heating wire type, and the wiring path, are the same as in Example 1.

[0047] In Example 2, the outer fabric is single-sided fleece, the backing fabric and the seam wrapping strip / tape material are all polyester fabric, and the rest is the same as in Example 1.

[0048] In Example 3, the outer fabric is coral fleece, the backing fabric and the seam tape / stitching material are polyester-cotton fabric, and the rest are the same as in Example 1.

[0049] The surface fabric and substrate fabric of Comparative Example 2 are the same as those of Example 2, and the rest are the same as those of Comparative Example 1.

[0050] The surface fabric and substrate fabric of Comparative Example 3 are the same as those of Example 3, and the rest are the same as those of Comparative Example 1.

[0051] A comparative washing experiment was conducted on the electric heating products of Examples 1-3 and Comparative Examples 1-3. The experimental equipment was a Whirlpool 3LWTW4840YW1, and the test standard was UL964. The machine washing test was carried out according to the following method:

[0052] Fill the washing machine with 65°C warm water, add half a cup of laundry detergent or mild soap flakes, and stir to dissolve. Place one product in the washing machine and soak for 5 minutes, gently agitate for 2 minutes, and spin dry at normal speed. Continue rinsing with cold water, agitate for 1 minute, and spin at normal speed. Repeat the rinse cycle. Dry in an automatic dryer at high temperature for 5 minutes. Finally, lay the product flat to its original shape and size until completely dry. Samples of 5 blankets from Examples 1-3 and 5 blankets from Comparative Examples 1-3 were taken. Each blanket was washed 30 times, and the appearance was observed after washing. The test results are as follows:

[0053] Table 1. Comparison of Experimental Results:

[0054]

[0055] Conclusion: Regardless of the materials used for the surface layer, substrate, and seam strip / band of the electric heating product, the electric heating wire is fixed using the fixing structure of this invention, and the electric heating wire will not tangle, be thrown out of the channel, or bend. In contrast, the tangling rate of Comparative Examples 1-3 is 80% for Comparative Example 1, 20% for Comparative Example 2, and 100% for Comparative Example 3. The percentages of electric heating wires being thrown out of the channel are 20%, 0%, and 40%, respectively. Functionality is generally normal after washing and immediate testing.

[0056] The test data also shows that if existing quilting technology is used with the heating wire threading process, the safety of the blanket is highly dependent on the fabric. Some fabrics are better, some are worse, but all are prone to knotting. The heating wire fixing structure and method of this invention ensures that the fixing effect is not affected by the type of fabric, giving consumers much more choice and guaranteeing safety. Industrial applicability

[0057] Type the industrial utility description paragraph here. Sequence List Free Content

[0058] Type the free content description paragraph for the sequence list here.

Claims

1. A fixing structure for an electric heating wire, characterized in that, It includes a binding strip / band and a sewing thread. The two ends of the binding strip / band in the width direction form a binding wing. The two binding wings are arranged opposite each other to form a channel for accommodating the electric heating wire. The sewing thread is arranged along the length direction of the binding strip / band in the overlapping part of the two binding wings.

2. The fixing structure for an electric heating wire as described in claim 1, characterized in that, The sewing thread is used to sew the two overlapping wings together with the main body of the electric heating product that fixes the electric heating wire; and / or there is one or more sewing threads, and when there are two or more sewing threads, the sewing threads are arranged in parallel; and / or the binding strip / band is a binding fabric strip; and / or the channel is a complete channel without gaps in the length direction; and / or the electric heating wire is tightly wrapped by the binding strip / band.

3. An electrically heated product, characterized in that, The product includes an electric heating product body, which includes at least one surface layer and / or at least one substrate. An electric heating wire is fixed to the electric heating product body by a fixing structure. The fixing structure adopts the electric heating wire fixing structure according to any one of claims 1-2. The binding strip / band is fixedly connected to the surface layer and / or substrate by the seam. The electric heating wire is wrapped in the channel and extends through the length of the channel.

4. The electric heating product according to claim 3, characterized in that, The electric heating product includes a first surface layer, a second surface layer, and a substrate, with the substrate sandwiched between the first and second surface layers, and the electric heating wires fixedly connected to the substrate through a fixing structure.

5. The electric heating product according to claim 3, characterized in that, It also includes a wiring device, which is fixedly mounted on the body of the electric heating product, and the two ends of the electric heating wire are respectively connected to the positive and negative terminals of the wiring device.

6. The electric heating product according to claim 5, characterized in that, The electric heating wires are arranged as a whole or in sections on the substrate or surface, and / or the wiring path of the electric heating wires consists of multiple parallel straight lines connected end to end, with each straight line connected end to end by an arc line.

7. The electric heating product according to claim 3, characterized in that, The first and second outer layers are respectively one of fleece, linen, or woven fabric, and / or the substrate and the binding strip / tape are respectively one of non-woven fabric, polyester fabric, or polyester-cotton fabric, and / or the electric heating product is an electric heating clothing product, which is any one of electric heating blanket, electric heating thermal underwear, electric heating thermal outerwear, or electric heating thermal pants; or the electric heating product is an electric heating product, which is any one of electric heating mattress, electric heating pad, electric heating top blanket, or electric heating bottom blanket; or the electric heating product is an electric heating outdoor product, which is any one of electric heating tent or electric heating shed.

8. The electric heating product according to claim 5, characterized in that, The wiring device is connected to the power plug via a power cord, and a controller is configured on the power cord.

9. A method for fixing an electric heating wire, characterized in that, The heating wire and the binding strip / band are aligned in the same direction along their length. The two ends of the binding strip / band in the width direction are folded together to form wings covering the heating wire. The two wings of the binding strip / band covering the heating wire are sewn together and fixed, so that the heating wire is located in the channel formed by the two wings. The binding strip / band covering the heating wire is then fixed to the substrate and / or surface of the electric heating product through its wings. Alternatively, the heating wire and the binding strip / band are aligned in the same direction along their length. The two ends of the binding strip / band in the width direction are folded together to form wings covering the heating wire. The two wings of the binding strip / band covering the heating wire are sewn together and fixed to the substrate or surface of the electric heating product, so that the heating wire is located in the channel formed by the two wings and fixed to the substrate and / or surface.

10. The method for fixing the electric heating wire as described in claim 9, characterized in that, The two ends of the electric heating wire are fixedly connected to the substrate and / or surface layer through the junction box.

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