A flexible cord based on reusable filling material

Abstract

The utility model relates to the field of electric wire provides a kind of soft electric wire based on reusable filling material. It aims to solve the problem of product appearance not neat caused by resource waste, unstable flame-retardant performance and cable structure deformation caused by non-recyclable filling material in traditional soft electric wire. The main scheme includes at least two cores, the core is composed of copper conductor (1) and polyvinyl chloride insulating layer (2) coated outside the copper conductor;A plurality of PVC filling strips (3) are filled in the gap between adjacent cores;Polyester tape wrapping layer (4) is coated on the outer periphery of the core and PVC filling strip (3), and the core and filling strip are fixed as a cable structure;Braided shielding layer (5) is coated on the outer periphery of the polyester tape wrapping layer (4);Polyvinyl chloride sheath layer (6) is coated on the outer periphery of the braided shielding layer (5).

Description

Technical Field

[0001] This utility model relates to the field of electrical wires and provides a flexible wire based on reusable filler material. Background Technology

[0002] Existing flexible electrical wires commonly use, such as Figure 1 The cable structure shown consists of four cores, each composed of a copper conductor 1 and polyvinyl chloride insulation 2, wrapped with a mesh PP filler rope 3 and a polyester tape 4. An outer braided shielding layer 5 and a polyvinyl chloride sheath 6 are then sequentially applied. This traditional structure has the following significant drawbacks:

[0003] Insufficient flame retardancy: Traditional filler materials (such as mesh PP filler rope 3) are not solid structures, and there are gaps inside, which allows gas to seep between the sheath and the insulation layer. Their flame retardancy is lower than that of solid filler structures, and they are more likely to accelerate the spread of fire in a fire (see appendix). Figure 1 (Diagram of the gap between the inner sheath and the filler layer).

[0004] Poor structural stability: Traditional filler materials are soft and easily cause core displacement and deformation under strong tension or external forces (such as production or usage environmental pressure), resulting in bulging on the sheath surface (see attached image). Figure 1 7) or depression (attached) Figure 1 (8) This results in the wires not having a round appearance, reducing customer acceptance.

[0005] Low environmental friendliness and economic efficiency: Traditional materials such as PP are difficult to recycle and reuse. After the wires are discarded, the filling material directly becomes industrial waste, causing resource waste and environmental pollution. At the same time, the low material utilization rate leads to increased production costs.

[0006] Problem Cause Analysis

[0007] The above-mentioned defects mainly stem from two aspects:

[0008] Material structural defects: Traditional filler materials are mainly loose mesh or fiber structures, and their own porosity leads to fluctuations in flame retardant performance. In addition, their mechanical strength is insufficient and they cannot effectively resist external pressure.

[0009] Material performance limitations: Materials such as PP have low thermal stability and hardness, and are prone to softening and deformation under high temperature environments. They also lack recyclable design, making it difficult to achieve recycling. Utility Model Content

[0010] The purpose of this invention is to solve the problems of resource waste caused by non-recyclable filler materials in traditional flexible wires, unstable flame retardant performance, and uneven product appearance caused by deformation of the cable structure.

[0011] To achieve the above objectives, the present invention employs the following technical means:

[0012] This utility model provides a flexible wire based on a reusable filler material, comprising:

[0013] At least two wire cores, each wire core consisting of a copper conductor and a polyvinyl chloride insulation layer covering the copper conductor;

[0014] Several PVC filler strips are used to fill the gaps between adjacent wire cores;

[0015] A polyester tape wrapping layer is applied around the outer periphery of the wire core and the PVC filler strip to fix the wire core and the filler strip into a cable structure.

[0016] A braided shielding layer is wrapped around the outer periphery of the polyester tape wrapping layer;

[0017] A polyvinyl chloride sheath layer covers the outer periphery of the braided shielding layer.

[0018] In the above scheme, the PVC filler strip is a solid strip structure, and its material is polyvinyl chloride composite material. The filler strip and the polyester tape wrapping layer together form a sealed filler layer, so that the cable cross section has a round structure.

[0019] In the above scheme, the cross-sectional shape of the PVC filler strip is circular or fan-shaped, and it is bonded to the outer surface of the polyvinyl chloride insulation layer of the adjacent wire core.

[0020] In the above scheme, the braided shielding layer is made of tin-plated copper wire and the braiding density is not less than 90%.

[0021] In the above scheme, the PVC filler strip includes the traction rope and the PVC material wrapped around the traction rope.

[0022] Because this utility model adopts the above-mentioned technical means, it has the following beneficial effects:

[0023] 1. Ordinary high-temperature filling materials such as ropes cannot be recycled, which easily leads to waste and environmental pollution. Using reusable filling materials reduces resource waste and environmental pollution, and meets environmental protection requirements.

[0024] 2. Conventional filler materials have gaps in their material and are not sealed solid materials, making them susceptible to various gas contaminations that cause them to age or deteriorate. In contrast, PVC filler strips are not prone to aging or wear, thus extending the service life and safety of the wires.

[0025] 3. Traditional filler materials (such as PP filler rope) have internal gaps, which can easily lead to gas infiltration and unstable flame retardant performance. This patent uses a solid PVC filler strip combined with a polyester tape wrapping layer to form a sealed filler structure, effectively isolating oxygen and harmful gases, and significantly improving the overall flame retardant capability of the cable.

[0026] 4. Traditional filler materials are soft and easily deformed under strong tension or external force, causing indentations or bulges in the cable cross-section. The PVC filler strip of this patent has a significantly higher hardness than PP filler rope. Its circular or fan-shaped cross-section fits tightly with the core insulation layer. Combined with the fixing effect of the polyester tape wrapping layer, it makes the cable structure more compact and the stress even, avoiding internal core displacement and ensuring the cable has a round appearance. Attached Figure Description

[0027] Figure 1 These are schematic diagrams of the cross-sections of a standard cable and a problematic cable. The left side shows the cable without deformation, and the right side shows the cable after deformation.

[0028] Figure 2 A diagram showing the four wire cores distributed symmetrically at the center;

[0029] Figure 3 This is a schematic diagram showing the direction of rotational force application during cable forming;

[0030] Figure 4 Schematic diagram of PVC filler strip;

[0031] 1-Copper conductor, 2-PVC insulation layer, 3-PVC filler strip, 3-1-PVC material, 3-2-Traction rope, 4-Polyester tape wrapping layer, 5-Braided shielding layer, 6-PVC sheath layer, 7-Sheath surface protrusion, 8-Sheath surface depression, 9-Direction of rotational force applied during cable formation. Detailed Implementation

[0032] The embodiments of this utility model will be described in detail below. Although this utility model will be described and illustrated in conjunction with some specific embodiments, it should be noted that this utility model is not limited to these embodiments. On the contrary, any modifications or equivalent substitutions made to this utility model should be covered within the scope of the claims of this utility model.

[0033] Furthermore, to better illustrate this invention, numerous specific details are provided in the following detailed embodiments. Those skilled in the art will understand that this invention can be implemented without these specific details.

[0034] Example 1:

[0035] This embodiment provides a flexible wire based on a reusable filler material, the structure of which is shown in the attached figure. Figure 2 and attached Figure 3 As shown, the specific implementation steps are as follows:

[0036] Core preparation:

[0037] It uses 4 wire cores, each wire core consists of a copper conductor 1 and a polyvinyl chloride insulation layer 2 covering it; the diameter of the copper conductor is 1.56mm and the thickness of the polyvinyl chloride insulation layer is 0.6mm.

[0038] Preparation of homemade PVC filler strips:

[0039] Recycle PVC waste and crush it into fragments with a particle size of ≤2mm;

[0040] Mixed by weight: 80% PVC scraps, 15% dioctyl phthalate (DOP) plasticizer, and 5% flame retardant;

[0041] The mixture is fed into a twin-screw extruder and melt-extruded at 170°C to form a solid filler strip 3 with a circular cross-section. The length of the filler strip is required for production and matches the outer surface of the wire core insulation layer. The PVC filler strip includes a traction rope and PVC material wrapped around the traction rope. The traction rope is made of nylon rope with a diameter of 0.3mm.

[0042] Cable wrapping:

[0043] like Figure 2 As shown, the four wire cores are centrally symmetrically distributed, and PVC filler strips 3 are embedded in the gaps between adjacent wire cores to ensure that the filler strips are tightly bonded to the insulation layer of the wire cores;

[0044] Polyester tape 4 is used to wrap the core and filler strip with an overlap of 50% to form a rounded cable structure.

[0045] Processing of shielding and sheath layers:

[0046] A tin-plated copper wire shielding layer 5 is woven outside the polyester tape wrapping layer. The copper wire diameter is 0.1 mm and the weaving density is 92%.

[0047] Finally, a polyvinyl chloride sheath layer 6 is extruded, with a sheath thickness of 0.9 mm. 5% flame retardant is added to the sheath material to achieve the UL94 V-0 flame retardant rating.

Claims

1. A flexible wire based on a reusable filler material, characterized in that, include: At least two wire cores, each wire core consisting of a copper conductor (1) and a polyvinyl chloride insulation layer (2) covering the copper conductor; Several PVC filler strips (3) are used to fill the gaps between adjacent wire cores; Polyester tape wrapping (4) covers the outer periphery of the wire core and PVC filler strip (3), fixing the wire core and filler strip into a cable structure; A braided shielding layer (5) is wrapped around the outer periphery of the polyester tape wrapping layer (4); A polyvinyl chloride sheath layer (6) covers the outer periphery of the braided shielding layer (5).

2. The flexible wire according to claim 1, characterized in that, The PVC filler strip (3) is a solid strip structure, and its material is polyvinyl chloride composite material. The filler strip (3) and the polyester tape wrapping layer (4) together form a sealed filler layer, so that the cable cross section has a round structure.

3. The flexible wire according to claim 1 or 2, characterized in that, The PVC filler strip (3) has a circular or fan-shaped cross-section and is attached to the outer surface of the polyvinyl chloride insulation layer (2) of the adjacent wire core.

4. The flexible wire according to claim 1, characterized in that, The braided shielding layer (5) is made of tin-plated copper wire with a braiding density of not less than 90%.

5. The flexible wire according to claim 1, characterized in that, The PVC filler strip (3) includes a traction rope (3-2) and an outer PVC material (3-1).

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