Bicolor extruded product and method of production

Abstract

Embodiments of the present disclosure disclose a double-color extrusion product and a production method. A specific embodiment of the production method comprises: transmitting a gas into a gas channel through a gas inlet hole of a mold; controlling a first extrusion head to extrude an insulating material into a first cavity channel of the mold to form an insulating layer of the double-color extrusion product; controlling a second extrusion head to extrude a conductive material into a second cavity channel of the mold to wrap the insulating layer to form a first conductive layer of the double-color extrusion product; and controlling a transmission mechanism to deliver a conductive metal sheet to cover a partial surface of the first conductive layer to form a second conductive layer of the double-color extrusion product; wherein the first cavity channel is located between the gas channel and the second cavity channel. The embodiment can obtain the double-color extrusion product in one production process, which can not only improve the production efficiency of the product, but also obtain a new conductive product to meet the use requirements of special scenarios.

Description

Technical Field

[0001] Embodiments of this disclosure relate to the field of manufacturing technology, and more specifically to two-color extruded products and manufacturing methods. Background Technology

[0002] With the popularization and widespread use of electronic products, all sorts of electronic products are emerging. Some products are getting larger (such as tablets), while others are becoming increasingly lightweight and compact (such as mobile phones and headphones). This places increasingly diverse demands on the electronic components installed within them to adapt to different application scenarios. At the same time, it also presents new technical requirements for the production and manufacturing of these electronic components.

[0003] Furthermore, current product process parameter testing typically relies on manual inspection or the use of multiple testing devices to test different process parameters. This results in long testing cycles, impacting production efficiency. Additionally, manual inspection often introduces human error, and different testing devices lack standardized testing benchmarks. These factors all affect the accuracy of the test results. Summary of the Invention

[0004] The summary section of this disclosure is intended to provide a brief overview of concepts that will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions. Some embodiments of this disclosure provide a two-color extruded product and a manufacturing method to address one or more of the technical problems mentioned in the background section above.

[0005] In a first aspect, some embodiments of this disclosure provide a method for producing a two-color extruded product, comprising: transmitting gas into an air passage through an air inlet of a mold; controlling a first extrusion head to extrude insulating material into a first cavity of the mold to form an insulating layer of the two-color extruded product; controlling a second extrusion head to extrude conductive material into a second cavity of the mold to wrap the insulating layer and form a first conductive layer of the two-color extruded product; controlling a transmission mechanism to convey conductive metal sheets to cover a portion of the surface of the first conductive layer and form a second conductive layer of the two-color extruded product; wherein the first cavity is located between the air passage and the second cavity.

[0006] In some embodiments, the conductive material of the first conductive layer contains an adhesive.

[0007] In some embodiments, the rotational speed of the first extruder head is greater than that of the second extruder head, and the conveying speed of the second conductive layer is 4.9 to 5.1 meters per minute; wherein the rotational speed of the first extruder head is 1.9 to 2.1 revolutions per second, and the rotational speed of the second extruder head is 0.9 to 1.1 revolutions per second.

[0008] In some embodiments, the insulating layer is made of silicone material with a Shore hardness of 40 to 50, and the viscosity of the first conductive layer is 90,000 to 100,000 Pascals per second.

[0009] In some embodiments, the two-color extruded product is a cube, and the material of the conductive metal sheet includes nickel.

[0010] In some embodiments, the length of the two-color extruded product is between 3.45 and 3.75 mm, and the cross-sectional width of the two-color extruded product is between 2.45 and 2.8 mm, and the cross-sectional height is between 2.3 and 2.6 mm; the thickness of the first conductive layer is between 0.05 and 0.15 mm, and the first conductive layer has rounded corners at the edges of the two-color extruded product; the width of the second conductive layer is between 2.424 and 2.576 mm, and the thickness is between 0.12 and 0.18 mm; wherein, the cross-sectional width is the dimension of the first side of the two-color extruded product where the second conductive layer is located, and the cross-sectional height is the dimension of the second side of the two-color extruded product adjacent to the first side.

[0011] In some embodiments, the method further includes: conveying the produced strip-shaped two-color extruded product to a high-temperature furnace for local heating, then conveying the strip-shaped two-color extruded product to a tunnel furnace for heating, drying, and molding; and cutting the dried and molded strip-shaped two-color extruded product to obtain a two-color extruded product.

[0012] In some embodiments, the two ends of the second conductive layer undergo bending deformation in a direction away from the first conductive layer during the cutting process, wherein the upper limit of the deformation size of the second conductive layer in the height direction is 0.1 mm and the upper limit of the deformation size in the length direction is 0.6 mm.

[0013] In some embodiments, the method further includes: acquiring a target image of the two-color extruded product using an image acquisition device, wherein the target image includes an end face image and an image of a second side adjacent to the first side where the second conductive layer is located; inputting the target image into a pre-trained detection model, and determining whether the two-color extruded product meets the process requirements based on the size data output by the detection model, wherein the detection model is used to determine the size of a preset part of the product based on the input product image; and spraying a conductive coating onto both ends of the two-color extruded product in response to the determination that the requirements are met.

[0014] Secondly, some embodiments of this disclosure provide a two-color extruded product obtained by a production method as described in any of the implementations of the first aspect above, comprising: an insulating layer constituting the main body of the two-color extruded product, made of an insulating material; a first conductive layer wrapping the insulating layer, made of a conductive material; and a second conductive layer covering a portion of the surface of the first conductive layer, forming the outer surface of the two-color extruded product together with the first conductive layer; wherein, a through hole is formed inside the insulating layer.

[0015] The various embodiments of this disclosure have the following beneficial effects: In some embodiments of this disclosure, the method for producing two-color extruded products allows gas to be transmitted into the gas channel through the gas inlet of the mold; the first extrusion head is controlled to extrude insulating material into the first cavity of the mold to form an insulating layer of the two-color extruded product; the second extrusion head is controlled to extrude conductive material into the second cavity of the mold to wrap the insulating layer, forming a first conductive layer of the two-color extruded product; and a conveying mechanism is controlled to transport conductive metal sheets to cover a portion of the surface of the first conductive layer, forming a second conductive layer of the two-color extruded product; wherein the first cavity is located between the gas channel and the second cavity. This embodiment, through the cooperation of the mold and the conveying mechanism, can produce two-color extruded products in one operation, thereby obtaining a new conductive product. This not only improves product production efficiency but also meets the needs of special application scenarios. Attached Figure Description

[0016] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and elements are not necessarily drawn to scale.

[0017] Figure 1 This is a flowchart of some embodiments of a method for producing two-color extruded products according to the present disclosure;

[0018] Figure 2 This is a schematic front view of some embodiments of two-color extruded products according to the present disclosure;

[0019] Figure 3 yes Figure 2 The diagram shows the right-side view of the two-color extruded product. Detailed Implementation

[0020] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0021] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0022] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0023] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0024] The names of messages or information exchanged between multiple devices in the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

[0025] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] Please refer to Figure 1 The diagram illustrates a process 100 of some embodiments of a method for producing a two-color extruded product according to the present disclosure. This production method may include the following steps:

[0027] Step 101: Gas is transferred into the air passage through the air inlet of the mold.

[0028] In this embodiment, the air inlet of the mold can be connected to an air pump via an air pipe. The mold also has a first cavity and a second cavity inside, used to shape the incoming raw material to form a two-color extruded product. The first extrusion head communicates with the first cavity, and the second extrusion head communicates with the second cavity. Furthermore, the first and second extrusion heads can be connected to their respective feed boxes.

[0029] In some embodiments, during the production of two-color extruded products, gas can be introduced into the gas channels of the mold through the air inlet in the mold. This allows the gases generated during the production process to be discharged, and the flowing gas can also serve a cooling function.

[0030] Step 102: Control the first extrusion head to extrude insulating material into the first cavity of the mold.

[0031] In some embodiments, the first extrusion head can be controlled to extrude insulating material into the first cavity of the mold. This can form a material such as... Figure 2 The insulating layer 10 of the two-color extruded product shown is used. This insulating layer 10 can form the main body of the two-color extruded product. The insulating material here can include rubber, silicone, etc.

[0032] It should be noted that the air passage in the mold is located within the first cavity. That is, the outer wall of the air passage can form the inner wall of the first cavity. In other words, the first cavity surrounds the air passage. This allows the formed insulating layer 10 to have a hollow structure, resulting in... Figure 2 Through holes inside the middle insulating layer 10 (equivalent to the interior of the main body of the product). These through holes can be through-holes that pass through both ends of the two-color extruded product.

[0033] Step 103: Control the second extrusion head to extrude conductive material into the second cavity of the mold.

[0034] In some embodiments, the second extrusion head can be controlled to extrude conductive material into the second cavity of the mold. This can form a conductive material as described above. Figure 2 The first conductive layer 11 of the two-color extruded product shown. From Figure 2 As can be seen, the first conductive layer 11 wraps around the insulating layer 10. Therefore, the first cavity in the mold is located within the second cavity. That is, the outer wall of the first cavity can form the inner wall of the second cavity. In other words, the second cavity surrounds the first cavity.

[0035] Step 104: Control the transmission mechanism to deliver the conductive metal sheet.

[0036] In some embodiments, a roll of conductive metal sheet can be mounted on a transport mechanism. The transport mechanism is controlled to gradually feed the conductive metal sheet from one end to the production line, thereby fixing it to the extruded first conductive layer 11. This can cover a portion of the surface of the first conductive layer, forming a shape such that... Figure 2 The second conductive layer 12 of the two-color extruded product shown.

[0037] As described above, the generation method disclosed herein proposes a novel production process that not only enables the production of two-color extruded products but also improves production efficiency. Specifically, it produces a product with three layers of material in a single step, resulting in a new conductive product to meet the needs of various application scenarios.

[0038] Optionally, to further improve production efficiency, the product obtained through the die is typically a strip-shaped two-color extruded product, i.e., a single strip. Furthermore, the raw materials in each layer are still in a non-solid state and easily deformable. Therefore, the produced strip-shaped two-color extruded product can first be transferred to a high-temperature furnace for localized heating and shaping. Afterward, the strip-shaped two-color extruded product is transferred to a tunnel furnace for heating, drying, and shaping. Further, after the strip-shaped two-color extruded product has dried and shaped, it can be cut to obtain the desired length of two-color extruded product.

[0039] Furthermore, the cut two-color extruded products can be inspected to determine whether they meet the process requirements, i.e., whether the products are qualified. For qualified products, a conductive coating can be sprayed onto both ends to further improve the conductivity of the product. To simplify the process and reduce costs, the material of the conductive coating can be the same as the material of the first conductive layer 11.

[0040] Optionally, to improve detection efficiency and accuracy, a target image of the two-color extruded product can be acquired using an image acquisition device and input into a pre-trained detection model. This allows the model to determine whether the two-color extruded product meets the process requirements based on the dimensional data output by the detection model. The acquisition angle of the target image can be determined based on the dimensional data required for product inspection. As an example, the target image may include an end-face image (such as...). Figure 2 The image shown is the front view image, and the image of the second side adjacent to the first side where the second conductive layer is located is shown. Figure 3 (The right view image shown).

[0041] The detection model here can be used to determine the dimensions of preset parts of a product based on an input product image. The detection model can be obtained by training an initial model using sample data. This initial model can be any existing neural network model created based on machine learning techniques. This neural network model can have various existing neural network structures (e.g., DenseBox, VGGNet, ResNet, SegNet, etc.).

[0042] The sample data here may include sample images and the corresponding sample detection data. See also Figure 2 and Figure 3 The dimensions marked in the diagram, where sample detection data can include dimensions A, B, C, D, E, F, J, K, and L. The sample images are input into the initial model to obtain detection data. This detection data can be obtained by measuring each of the above-mentioned marked dimensions at least once. To improve the accuracy of the detection results, for each marked dimension, two or more measurements (e.g., both sides and the middle) can be performed to obtain multiple detection data for that dimension. Then, these multiple detection data can be analyzed with the corresponding sample detection data (i.e., the sample dimensions of that marked dimension) to determine the loss value for that dimension. For example, the difference between the average of the multiple detection data and the sample detection data. Next, the weighted result of the loss values ​​for each marked dimension can be used as the total loss value for the samples. Based on the comparison between the total loss value and the target value, it is determined whether the initial model has been trained successfully. If it is determined that training has not been completed, such as if the total loss value is greater than the target value, the relevant parameters of the initial model can be adjusted to continue training. If it is determined that training has been completed, the trained initial model can be used as the detection model.

[0043] It should be noted that for each annotation size, the detection model can output at least one detection data point for that annotation size. As an example, for... Figure 2 The dimension A marked in the figure can output three detection dimensions: left, middle, and right, or the average of the three detection dimensions.

[0044] Understandably, the aforementioned detection model can obtain all the required annotation dimensions in one go. This avoids multiple manual inspections, preventing the introduction of human error. Furthermore, it eliminates the need for frequent changes to detection equipment, ensuring consistent benchmarks for all detection data. This not only improves detection efficiency but also guarantees the accuracy of the detection data. Moreover, when the required annotation dimensions change, only retraining of the detection model is required. This avoids the need to replace detection equipment due to incompatibility, thus helping to reduce production costs.

[0045] Here, the mold can be any mold with a first cavity, a second cavity, an air passage, and an air inlet communicating with the air passage, capable of facilitating the aforementioned production. The shape and structure of each cavity can be designed according to product requirements. The specific shape and dimensions of the two-color extruded product can be set according to actual usage needs. For example, a two-color extruded product can be arched. Or, for example… Figure 2 As shown, the two-color extruded product can be cuboid, such as a rectangular prism or a cube. In this case, the second conductive layer 12 can cover the first side of the first conductive layer 11. This first side can be any side of the two-color extruded product, such as... Figure 2 The bottom side is shown in the image. The material of the conductive metal sheet can include (but is not limited to) nickel. This not only ensures good conductivity of the product but also facilitates soldering, better meeting welding requirements.

[0046] Understandably, in order to securely connect the second conductive layer (conductive metal sheet) 12 to the first conductive layer 11, an adhesive can be mixed into the conductive material of the first conductive layer 11. The adhesive does not affect the conductivity of the first conductive layer 11 and also gives the conductive material self-adhesive properties. Thus, under the action of the adhesive, the second conductive layer 12 can be securely connected to the first conductive layer 11. In other words, the second conductive layer 12 can be attached to the first side of the first conductive layer 11 while the first conductive layer 11 is being manufactured. This can shorten the product production cycle and improve production efficiency. Furthermore, compared to physical fixing methods, this fixing method not only simplifies the manufacturing process but also helps to improve the firmness of the fixation and extend the product's service life.

[0047] In some embodiments, the cross-sectional width of the two-color extruded product can be between 2.45 and 2.8 mm, while the cross-sectional height can be between 2.3 and 2.6 mm. The cross-sectional width can be the dimension of the first side where the second conductive layer 12 is located in the two-color extruded product, such as... Figure 2 The width dimension A is indicated in the diagram. The cross-sectional height can be the dimension of the second side adjacent to the first side in a two-color extruded product, such as... Figure 2The dimension B is indicated in the figure. As an example, the width A can be 2.7 mm, with tolerances of +0.10 mm and -0.25 mm. The height B can be 2.4 mm, with tolerances of +0.2 mm and -0.10 mm. Furthermore, as... Figure 3 As shown, the length C of the two-color extruded product can be between 3.45 and 3.75 mm. If the length is 3.6 mm, the tolerance requirement is ±0.15 mm.

[0048] Optionally, the diameter of the through hole (equivalent to the inner diameter of the two-color extruded product) can be between 1.0 and 1.2 mm. For example, the diameter D of the through hole can be 1.10 mm, with a tolerance of ±0.10 mm. Additionally, the thickness L of the first conductive layer 11 (i.e., the thickness of the insulating layer 10) can be between 0.05 and 0.15 mm, such as 0.1 mm, with a tolerance of ±0.05 mm. Figure 2 As can be seen, the four corners of the main body of the product (i.e., the insulating layer 10) can be rounded. In this case, the first conductive layer 11 can also be rounded at the corners of the two-color extruded product.

[0049] Furthermore, the width of the second conductive layer 12 can be between 2.424 and 2.576 mm, and the thickness can be between 0.12 and 0.18 mm. For example... Figure 2 As shown, the width E of the second conductive layer 12 can be 2.5 mm, with a tolerance of ±0.076 mm. The thickness F of the second conductive layer 12 can be 0.15 mm, with a tolerance of ±0.03 mm.

[0050] Furthermore, in some embodiments, the two ends of the second conductive layer 12 may deform due to cutting, typically bending away from the first conductive layer 11, such as... Figure 3 The dashed line portion is shown in the diagram. At this time, the maximum (i.e., upper limit) deformation dimension K of the second conductive layer 12 in the height direction can be 0.1 mm, and the maximum (i.e., upper limit) deformation dimension J in the length direction can be 0.6 mm.

[0051] As described above, the two-color extruded product of this disclosure is particularly small in size, making its manufacturing process quite challenging. By using a mold and a conveying mechanism in conjunction, not only can a two-color extruded product be formed in one pass, but the dimensional requirements of each component are also helped to be met. Here, the material hardness of the insulating layer 10 can be in the Shore hardness range of 40 to 50. The material viscosity of the first conductive layer 11 can be 90,000 to 100,000 Pascal-seconds (Pa·s).

[0052] Optionally, in addition to adjusting the viscosity or hardness of the raw materials, the flow rate of each layer of raw materials can be controlled by controlling the rotation speed of each extruder head, thereby ensuring the dimensional requirements of the two-color extruded product. For example, the rotation speed of the first extruder head can be greater than that of the second extruder head. As an example, the rotation speed of the first extruder head can be 1.9 to 2.1 rpm (approximately 2.0 rpm). The rotation speed of the second extruder head can be 0.9 to 1.1 rpm (e.g., 1.0 rpm). The conveying speed of the second conductive layer 12 can be 4.9 to 5.1 m / min (e.g., approximately 5 m / min).

[0053] like Figure 2 and 3 As shown, embodiments of this disclosure also provide a two-color extruded product. This product can be obtained by the production method described in any of the above embodiments. From Figure 2 As can be seen, the two-color extruded product may include an insulating layer 10, a first conductive layer 11, and a second conductive layer 12. Here, the insulating layer 10 is made of an insulating material and forms the main body of the two-color extruded product, with through-holes formed inside. The first conductive layer 11 is made of a conductive material and can wrap around the insulating layer 10. The second conductive layer 12 can cover a portion of the surface of the first conductive layer 11 and, together with the first conductive layer 11, constitute the outer surface of the two-color extruded product. The specific structural dimensions of the product can be found in the relevant descriptions in the above embodiments, and will not be repeated here.

[0054] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0055] The functions described above in this document can be performed, at least in part, by one or more hardware logic components. For example, exemplary types of hardware logic components that can be used, without limitation, include: Field Programmable Gate Arrays (FPGAs), Application-Specific Integrated Circuits (ASICs), Application Standard Products (ASSPs), System-on-Chip (SoCs), Complex Programmable Logic Devices (CPLDs), and so on.

[0056] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A method for producing a two-color extruded product, comprising: Gas is transmitted into the air passage through the air inlet of the mold, and the air inlet of the mold is connected to the air pump through an air pipe. The first extrusion head is controlled to extrude insulating material into the first cavity of the mold to form the insulating layer of the two-color extruded product; The second extrusion head is controlled to extrude conductive material into the second cavity of the mold to coat the insulating layer and form the first conductive layer of the two-color extruded product, wherein the conductive material of the first conductive layer contains an adhesive. A control transmission mechanism conveys a conductive metal sheet to cover a portion of the surface of the first conductive layer, forming a second conductive layer of the two-color extruded product. The two-color extruded product is a cuboid, and the conductive metal sheet is made of nickel. The second conductive layer covers a first side of the first conductive layer. The first side can be any side of the two-color extruded product. The first cavity is located between the airway and the second cavity, and the outer wall of the airway constitutes the inner wall of the first cavity. The produced strip-shaped two-color extruded product is conveyed to a high-temperature furnace for local heating, and then conveyed to a tunnel furnace for heating, drying and molding. The dried and shaped strip-shaped two-color extruded product is cut to obtain the two-color extruded product; The length of the two-color extruded product is between 3.45 and 3.75 mm, the cross-sectional width of the two-color extruded product is between 2.45 and 2.8 mm, and the cross-sectional height is between 2.3 and 2.6 mm. The thickness of the first conductive layer is between 0.05 and 0.15 mm, and the first conductive layer has rounded corners at the edges and corners of the two-color extruded product; The width of the second conductive layer is between 2.424 and 2.576 mm, and the thickness is between 0.12 and 0.18 mm. Wherein, the cross-sectional width is the dimension of the first side where the second conductive layer is located in the two-color extruded product, and the cross-sectional height is the dimension of the second side adjacent to the first side in the two-color extruded product; The target image of the two-color extruded product is acquired by an image acquisition device, wherein the target image includes an end face image and an image of a second side adjacent to the first side where the second conductive layer is located; The target image is input into a pre-trained detection model. Based on the size data output by the detection model, it is determined whether the two-color extruded product meets the process requirements. The detection model is used to determine the size of a preset part of the product based on the input target image. In response to the determination that the condition is met, a conductive coating is sprayed onto both ends of the two-color extruded product.

2. The production method according to claim 1, wherein, The rotational speed of the first extruder head is greater than that of the second extruder head, and the conveying speed of the second conductive layer is 4.9 to 5.1 meters per minute; The first extruder rotates at a speed of 1.9 to 2.1 rpm, and the second extruder rotates at a speed of 0.9 to 1.1 rpm.

3. The production method according to claim 1, wherein, The insulating layer is made of silicone with a Shore hardness of 40 to 50, and the first conductive layer has a viscosity of 90,000 to 100,000 Pa·s.

4. The production method according to claim 1, wherein, During the cutting process, the two ends of the second conductive layer bend and deform away from the first conductive layer. The upper limit of the deformation size of the second conductive layer in the height direction is 0.1 mm, and the upper limit of the deformation size in the length direction is 0.6 mm.

5. A two-color extruded product, obtained by the production method as described in any one of claims 1-4, comprising: The insulating layer, which forms the main body of the two-color extruded product, is made of insulating material. The first conductive layer, which encloses the insulating layer, is made of a conductive material; The second conductive layer covers a portion of the surface of the first conductive layer and together with the first conductive layer constitutes the outer surface of the two-color extruded product. The insulating layer has through holes formed inside.

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