A cable and a process for its preparation

Abstract

The application discloses a cable and a preparation process thereof, which comprises a cable core, a tearing tape, a second shielding tape, an isolation tape and a second plastic layer, the tearing tape is fixedly attached to the outside of the cable core along the length direction of the cable core, the second shielding tape is longitudinally wrapped on the outside of the cable core along the length direction of the cable core, the edge of the second shielding tape in the width direction is fixed to the outer surface of the tearing tape, the isolation tape is spirally wound on the outside of the second shielding tape along the length direction of the cable core, and the second plastic layer is wrapped on the outside of the isolation tape; the cable core comprises a plurality of groups of wires, and the plurality of groups of wires are arranged in a spiral twisted manner. The tearing tape is arranged on the outer surface of the cable core, the second shielding tape is wrapped on the outside of the cable core and the tearing tape in a longitudinal wrapping manner, the second shielding tape and the second plastic layer can be synchronously torn by pulling the tearing tape, and the peeling of the shielding layer and the insulating outer layer is completed at one time, so that the operation is convenient.

Description

Technical Field

[0001] This invention relates to cables, and more specifically, to a cable and its manufacturing process. Background Technology

[0002] Cables with shielding effects typically have an aluminized polyester sheath wrapped around the cable core, and then coated with rubber to form the cable. Because the aluminized polyester sheath itself has high strength and toughness, is tensile-resistant and not easy to break, conventional wire cutters can only cut the outermost plastic sheath of the cable core, and cannot effectively cut and peel off the inner aluminized polyester sheath. Moreover, the original process uses a winding wrapping structure, which further improves the overall strength and toughness of the aluminized polyester sheath. Manual peeling is time-consuming and laborious, affecting the efficiency of cable core wiring and end-of-line processing.

[0003] Some cables have internal tear strips. However, the existing tear strips are built into the outermost plastic sheath. During construction, after cutting the outer plastic layer, the tear strip can be directly exposed and the outer plastic sheath can be quickly torn apart by pulling the tear strip. However, the tearing range of the tear strip is limited to the plastic layer and cannot be applied to the inner aluminum-plated polyester sheath that wraps multiple sets of conductors. After the plastic layer is peeled off, the aluminum-plated shielding sheath still needs to be removed separately with special tools. Moreover, during peeling, incomplete peeling and scratching of the internal conductors are likely to occur, resulting in a high rework rate. Therefore, there is an urgent need to improve this. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cable and its manufacturing process. By setting the tear strip on the outer surface of the cable core, and then wrapping the second shielding strip on the outside of the cable core and the tear strip in a longitudinal wrapping manner, the second shielding strip and the second plastic layer can be torn apart simultaneously by pulling the tear strip, and the shielding layer and the outer insulation layer can be peeled off in one go, which is convenient to operate.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a cable, comprising a cable core, a tear strip, a second shielding strip, an isolation strip, and a second plastic layer, wherein the tear strip is pasted and fixed to the outside of the cable core along the length direction of the cable core, the second shielding strip is longitudinally wrapped around the outside of the cable core along the length direction of the cable core, the edge of the second shielding strip in the width direction is fixed to the outer surface of the tear strip, the isolation strip is spirally wound around the outside of the second shielding strip along the length direction of the cable core, and the second plastic layer is wrapped around the outside of the isolation strip; the cable core comprises multiple sets of conductors, and the multiple sets of conductors are spirally twisted together.

[0006] The tear strip includes a substrate layer, with aluminum-plated layers laminated on both sides of the substrate layer. A first adhesive and a second adhesive are laminated on the outside of the aluminum-plated layers on both sides, respectively. The tear strip is bonded and fixed to the surface of the cable core by the first adhesive and to the second shielding strip by the second adhesive. The tear strip is located inside the coverage and mating area of ​​the second shielding strip and covers the bonding joint positions of the two sides of the second shielding strip. The peel strength per unit width between the second adhesive and the second shielding strip is greater than the peel strength per unit width between the first adhesive and the cable core.

[0007] Furthermore, the breaking force of the tear strip is greater than the total peel force at the interface between the tear strip and the second shielding strip, and the total peel force at the interface between the tear strip and the second shielding strip is greater than the total peel force at the interface between the tear strip and the cable core.

[0008] Furthermore, the thickness of the substrate layer is 15μm-25μm, the width of the tear strip is 4mm-5mm, the thickness of the second shielding strip is 20μm-30μm, and the single-sided bonding width of the second shielding strip and the tear strip ranges from 1.5mm to 2mm.

[0009] Furthermore, the conductor includes two guide wires and a first shielding tape. The two guide wires are spirally twisted together, and the first shielding tape is spirally wrapped around the outside of the two twisted guide wires. The guide wires include copper wires, and the copper wires are covered with a first plastic layer.

[0010] A cable manufacturing process includes the following steps:

[0011] S1. Prepare the cable core by twisting multiple sets of conductors together using a twisting machine to obtain the cable core;

[0012] S2. The tear strip is conveyed synchronously with the cable core, and one side of the tear strip is pasted and fixed to the outer surface of the cable core;

[0013] S3. The second shielding tape is conveyed synchronously with the cable core, and the second shielding tape is longitudinally wrapped around the cable core. The two sides of the second shielding tape are pasted and fixed to the outer surface of the tear tape.

[0014] S4. The cable core covered with the second shielding tape is fed into the wrapping head device, and the isolation tape is spirally wrapped around the outside of the second shielding tape through the wrapping head device to complete the wrapping and shaping of the cable core.

[0015] S5. The outer plastic sheath is extruded using an extruder, and after cooling, a second plastic layer is formed, resulting in the finished cable.

[0016] Furthermore, prior to step S1, a second shielding band bandwidth selection step is performed:

[0017] Select a section of cable core sample with a tear strip attached, and measure several points on the sample to obtain the actual outer perimeter of the sample at the corresponding points. Take the average value as the average perimeter of the sample. The bandwidth of the selected second shielding strip is 0.5mm-1mm smaller than the actual perimeter of the sample.

[0018] Furthermore, step S3 is completed in the covering mold, which includes a connecting block and a covering head. The connecting block is fixedly connected to the covering head, which includes an inlet and an outlet. The cable core, tear strip, and second shielding strip are simultaneously fed into the covering mold from the inlet and covered into a whole by the covering mold before being discharged from the outlet. The tear strip is pasted below the cable core, and the second shielding strip is located above the cable core. The second shielding strip is guided and gathered by the inlet and then longitudinally wrapped around the outside of the cable core, and is pasted and fixed to the tear strip that has been pasted on the outer surface of the cable core.

[0019] Furthermore, the feed inlet includes an interconnected arc-shaped conical surface, a guide channel, and a clearance groove. The arc-shaped conical surface has a semi-circular cross-section. The minimum cross-sectional dimension of the arc-shaped conical surface is the same as that of the guide channel. The guide channel is located at the center of the arc-shaped conical surface, and shoulders are formed between the two sides of the guide channel and the arc-shaped conical surface. The end of the guide channel is connected to the discharge port.

[0020] The cable core passes through the guide channel, the upper surface of the second shielding strip is in close contact with the surface of the arc-shaped cone, the second shielding strip is gradually guided and gathered along the arc-shaped cone and then covers the outer surface of the cable core located in the guide channel, the tear strip is located in the clearance groove area and there is a gap between the lower surface of the tear strip and the bottom of the clearance groove.

[0021] Furthermore, it also includes a bracket, the connecting block is fixedly connected to the bracket, the connecting block includes a discharge channel, the discharge channel is coaxially arranged with the discharge port, and the cable core covered with a second shielding strip passes through the discharge channel.

[0022] Furthermore, in step S3, the second shielding strip gradually converges inward along the arc-shaped conical surface, and the guide angle of the arc-shaped conical surface... The value range is 20°-30°, and the axial length of the arc-shaped conical surface along the cable core conveying direction is L;

[0023] Guide angle The smaller the angle, the smoother the second shielding band converges, and the longer the required axial length L of the arc-shaped conical surface; guide angle The larger the value, the faster the second shielding band retracts, and the shorter the axial length L of the corresponding arc-shaped conical surface.

[0024] In summary, the present invention has the following beneficial effects:

[0025] After the cable is fully formed, the tear strip is precisely positioned inside the area covered by the second shielding strip, and precisely corresponds to the adhesive joint positions on both sides of the second shielding strip. When the user is wiring and processing the end on site, they only need to use a regular wire cutter to cut the second plastic layer of the cable end. Since the wire cutter cannot cut the high-toughness tear strip and the second shielding strip laterally, the end of the tear strip will be exposed after cutting. The operator can use simple clamping tools such as needle-nose pliers to hold the exposed end of the tear strip and continuously and steadily tear it along the cable axis towards the joints on both sides of the second shielding strip. At this time, the tear strip, relying on the adhesive force of the double-sided adhesive, can simultaneously drive the edges of the second shielding strip bonded on both sides to separate, so that the second shielding strip is torn along the joint, and at the same time, the outer isolation strip and the second plastic layer are torn apart, completing the overall stripping of the conductor in one go, quickly exposing the internal conductor. This solves the problems of cumbersome stripping of traditional cables, easy scratching of the conductor core, and incomplete stripping, greatly simplifying the cable end processing process, making the operation convenient, efficient and labor-saving, and significantly improving construction efficiency. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the cable;

[0027] Figure 2 for Figure 1 Enlarged view at point A;

[0028] Figure 3 This is a schematic diagram of the encapsulation mold structure;

[0029] Figure 4 This is a plan view of the feed channel;

[0030] Figure 5 This is a schematic diagram of the cable core sheathing.

[0031] Figure 6 This is a cross-sectional view of the tear band.

[0032] Reference numerals: 1. Conductor; 11. Guide wire; 111. Copper wire; 112. First plastic layer; 12. First shielding strip; 2. Cable core; 3. Tear strip; 31. First backing adhesive; 32. Second backing adhesive; 33. Protective film; 34. Substrate layer; 35. Aluminum plating layer; 4. Second shielding strip; 5. Second plastic layer; 6. Isolation strip; 7. Covering mold; 71. Connecting block; 711. Discharge channel; 72. Covering head; 721. Arc-shaped conical surface; 722. Guide channel; 723. Clearance groove; 724. Shoulder; 725. Discharge port; 726. Inlet; 8. Support. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1 to 6 As shown, this embodiment discloses a cable, including a cable core 2, a tear strip 3, a second shielding strip 4, an isolation strip 6, and a second plastic layer 5.

[0035] like Figure 1 As shown, the cable core 2 includes multiple sets of conductors 1. In this embodiment, there are four conductors 1. The multiple sets of conductors 1 are spirally twisted together. By using a spiral winding and twisting method, the four sets of conductors 1 can be firmly combined into a whole cable core 2 structure. After twisting, the conductors 1 are closely attached and constrained to each other, which can effectively prevent the cable core 2 from becoming unraveled or misaligned during subsequent processing, and improve the overall compactness of the cable core 2 structure.

[0036] The conductor 1 includes two conductors 11 and a first shielding strip 12. The conductors 11 include copper wires 111, and the copper wires 111 are covered with a first plastic layer 112. The two conductors 11 are spirally twisted together. The first plastic layer 112 serves as an insulating layer to achieve electrical isolation between the copper wires 111. The first shielding strip 12 is a double-sided aluminized polyester strip. The first shielding strip 12 is spirally wrapped around the outside of the two twisted conductors 11. By wrapping the first shielding strip 12 around the outside of the two conductors 11 in a spiral manner, not only can the electromagnetic shielding function of a single set of conductors 1 be achieved, avoiding mutual interference between the signals of conductors 1, but the double conductors 11 can also be prevented from loosening and shifting by being wrapped and fixed.

[0037] like Figure 6As shown, the tear strip 3 is a composite PET film strip with an overall width ranging from 4mm to 5mm. It includes a substrate layer 34, which is a PET film with a thickness of 15μm to 25μm. This thickness range ensures that the tear strip 3 has sufficient structural strength. When the cable is cut with wire cutters, the blade pressure on the tear strip 3 causes the film substrate to wrinkle and deform under pressure, and to slide laterally to both sides of the blade. The shear stress is fully dispersed by the plastic deformation of the film, making it difficult to form effective transverse cutting stress. Therefore, it is difficult to cut the tear strip 3 transversely when using wire cutters. Only an indentation will be formed on the surface of the tear strip 3, while the strip body remains continuous and intact, which facilitates subsequent peeling operations. Furthermore, the 4mm-5mm bandwidth ensures that the tear strip 3 forms a sufficient and effective adhesive contact area with the cable core 2 and the second shielding strip 4, ensuring a reliable bond. At the same time, the bandwidth is not too large and will not occupy too much internal radial space of the cable.

[0038] In this embodiment, the tear strip 3 also has an electromagnetic shielding function. Specifically, the substrate layer 34 has an aluminum plating layer 35 laminated on both sides by a vapor deposition process. The aluminum plating layer 35 is used for electromagnetic shielding. The outer sides of the aluminum plating layer 35 are respectively laminated with a first adhesive 31 and a second adhesive 32. Before the tear strip 3 is pasted with the cable core 2 and the second shielding strip 4, the outer surfaces of the first adhesive 31 and the second adhesive 32 are covered with a protective film 33 to prevent the adhesive from being contaminated with dust and impurities in advance during storage, transportation and early processing, and to prevent the adhesive from failing due to mis-adhesion. In the cable production process, before the bonding and pasting operation, the protective film 33 will be automatically peeled off by the equipment, exposing the first adhesive 31 and the second adhesive 32, and then the tear strip 3 is pasted and assembled with the cable core 2 and the second shielding strip 4 respectively.

[0039] like Figure 1 , Figure 2 and Figure 5 As shown, the tear strip 3 is attached and fixed to the outside of the cable core 2 along the length direction of the cable core 2 by the first backing adhesive 31. The tear strip 3 is equipped with an independent unwinding mechanism (not shown in the figure). The tear strip 3 is also unwound and conveyed synchronously on the same straight line as the cable core 2 and below the cable core 2, so that the conveying direction of the tear strip 3 is parallel and consistent with the axial conveying direction of the cable core 2, ensuring that the tear strip 3 can be spread along the axial direction of the cable core 2 as a whole, and the linear speed of the tear strip 3 unwinding output is matched with the travel conveying speed of the cable core 2.

[0040] Before the tear strip 3 is bonded to the cable core 2, the protective film 33 on the surface of the first adhesive 31 is removed by the equipment. The method of removing the protective film 33 is existing technology, and its specific principle will not be elaborated in this specification. This ensures the adhesion of the two. After the tear strip 3 is bonded to the surface of the cable core 2, the tear strip 3 and the outer surface of the cable core 2 are tightly bonded together by the pressure-sensitive adhesive effect of the first adhesive 31. There is no relative sliding between the two, so they will be transported synchronously with the cable core 2.

[0041] The second shielding strip 4 is made of the same material as the first shielding strip 12, namely a high-toughness aluminized polyester film, which has excellent electromagnetic shielding performance. The thickness of the second shielding strip 4 is 20μm-30μm. By setting a thicker second shielding strip 4, the electromagnetic interference resistance of the cable can be further enhanced. Figure 1 and Figure 2 As shown, the second shielding strip 4 is wrapped around the outside of the cable core 2 in a longitudinally laid-out manner along the length direction of the cable core 2. Unlike the traditional spiral winding wrapping structure, the edge of the second shielding strip 4 in the width direction is fixed to the outer surface of the tear strip 3.

[0042] This embodiment optimizes the conveying and wrapping process of the second shielding tape 4, which is completely different from the existing winding feeding process. Specifically, the second shielding tape 4 is also equipped with an independent unwinding mechanism (not shown in the figure). The second shielding tape 4 is synchronously unwound and conveyed above the cable core 2 on the same straight line, so that the conveying direction of the second shielding tape 4 is parallel and consistent with the conveying direction of the cable core 2 and the tear tape 3. Furthermore, the unwinding output speed of the second shielding tape 4 is also adapted to the conveying speed of the cable core 2.

[0043] After the tear strip 3 is pasted onto the cable core 2, the protective film 33 located at the second adhesive 32 is removed by the equipment. The automatic peeling and winding of the protective film 33 are completed using existing mature technology and equipment. Its specific structure and working principle will not be described in detail in this manual. After the protective film 33 is peeled off, the second shielding strip 4 is wrapped longitudinally on the outside of the cable core 2 using a sheet-like wrapping process through the wrapping mold 7. During the wrapping process, the wrapping mold 7 will guide the left and right sides of the second shielding strip 4 to smoothly fold inward and approach the second adhesive 32, and finally stick it to the outside of the second adhesive 32. After the bonding is completed, the second shielding strip 4 and the tear strip 3 close each other to form a complete ring shielding structure, which wraps the cable core 2 in all directions, realizes the electromagnetic shielding protection of the cable core 2, and greatly improves the anti-interference performance of the cable.

[0044] The single-sided bonding width of the second shielding tape 4 and the tear tape 3 ranges from 1.5mm to 2mm. The unit width peel bond strength between the second backing adhesive 32 and the second shielding tape 4 is greater than that between the first backing adhesive 31 and the cable core 2. The unit width peel bond strength refers to the average peeling force required to peel the two bonded flexible materials along the bonding interface under specified peeling angle and peeling rate conditions. Through the above matching design of bonding width and bonding strength, the bonding strength of each interface can be effectively controlled. The mechanical failure sequence is preset and controlled to ensure that when the tear strip 3 is pulled, the tear strip 3 body will not break first. Furthermore, the breaking force of the tear strip 3 is greater than the total peel force at the interface between the tear strip 3 and the second shielding strip 4, and the total peel force at the interface between the tear strip 3 and the second shielding strip 4 is greater than the total peel force at the interface between the tear strip 3 and the cable core 2. This ensures that when an axial tensile force is applied to the tear strip 3, the tear strip 3 will preferentially separate from the surface of the cable core 2. The tensile force continues to be transmitted, and the second shielding strip 4 is torn along the seam along the longitudinal wrapping gap of the second shielding strip 4.

[0045] like Figure 1 As shown, the isolation strip 6 is a mica strip. Since the bonding strength between the second shielding strip 4 and the cable core 2 is lower after the second shielding strip 4 is wrapped with the cable core 2 using a longitudinal wrapping process compared to the spiral winding method, after the second shielding strip 4 is wrapped, the isolation strip 6 is tightly wrapped around the outer surface of the second shielding strip 4 using a spiral winding method. The mica material itself has excellent high temperature resistance, flame retardancy, fireproof insulation properties, which can effectively improve the overall fireproof and flame retardant rating and high temperature protection capability of the cable, and improve the safety and service life of the cable. At the same time, the spiral winding structure can form a uniform radial binding force on the inner second shielding strip 4 to prevent it from loosening. Moreover, the mica isolation strip 6 itself is thin and easy to tear, and will not hinder the tearing operation of the subsequent tear strip 3. After the isolation strip 6 is wrapped, the second plastic layer 5 is uniformly wrapped around the outside of the isolation strip 6 by an extrusion machine, and finally formed into a complete finished cable.

[0046] like Figure 1 and Figure 2As shown, after the cable is formed, the tear strip 3 is precisely positioned inside the coverage area of ​​the second shielding strip 4, and precisely corresponds to the bonding seam positions on both sides of the second shielding strip 4. When the user is wiring and processing the end at the site, they only need to use a regular wire cutter to cut the second plastic layer 5 of the cable end. Since the wire cutter cannot cut the high-toughness tear strip 3 and the second shielding strip 4 laterally, the end of the tear strip 3 will be exposed after cutting. The operator can use simple clamping tools such as needle-nose pliers to hold the exposed end of the tear strip 3 along the cable axis and towards the second shielding strip. The shielding tape 4 is continuously and steadily torn at the seam on both sides. At this time, the tearing tape 3, relying on the adhesive force of the double-sided adhesive, can simultaneously drive the edges of the second shielding tape 4 bonded on both sides to separate, so that the second shielding tape 4 is torn along the joint. At the same time, the outer isolation tape 6 and the second plastic layer 5 are torn apart, and the overall stripping operation of the conductor 1 is completed in one go, quickly exposing the internal conductor 1. This solves the problems of cumbersome stripping of traditional cables, easy scratching of the wire core, and incomplete stripping. It greatly simplifies the cable end processing process, is convenient, efficient and labor-saving, and greatly improves construction efficiency.

[0047] like Figure 3 and Figure 4 As shown, the coating mold 7 is assembled and fixed on the bracket 8. The coating mold 7 includes a connecting block 71 and a coating head 72. One end of the connecting block 71 is fixedly connected to the bracket 8, and the other end is fixedly connected to the coating head 72. The coating head 72 includes an inlet 726 and an outlet 725. During the production process, the second shielding tape 4 is located above the cable core 2, and the tear tape 3 is pasted below the cable core 2. The cable core 2, the tear tape 3, and the second shielding tape 4 are simultaneously fed into the coating mold 7 from the inlet 726 and wrapped into a whole by the coating mold 7 before being sent out from the outlet 725.

[0048] In this embodiment, the second shielding tape 4 is guided and gathered by the feed port 726 and longitudinally wrapped around the outside of the cable core 2, and is attached and fixed to the tear tape 3 that has been pasted on the outer surface of the cable core 2. Specifically, the feed port 726 forms a gathering structure with feeding at the large end and shaping and discharging at the small end. It includes an interconnected arc-shaped conical surface 721, a guide channel 722, and a clearance groove 723. The arc-shaped conical surface 721 has a semi-circular cross-section. The smallest end cross-sectional dimension of the arc-shaped conical surface 721 is consistent with that of the guide channel 722, ensuring that the second shielding tape 4 can transition smoothly without any steps or jamming points. The guide channel 722 is located at the center of the arc-shaped conical surface 721, and shoulders 724 are formed between the two sides of the guide channel 722 and the arc-shaped conical surface 721. The end of the guide channel 722 is connected to the discharge port 725 for outputting the semi-finished cable core 2 after wrapping.

[0049] Along the material conveying direction of the cable core 2, the cable core 2 passes through the guide channel 722. The guide channel 722 plays a role in radial limiting and centering positioning of the cable core 2. After the second shielding strip 4 enters the covering mold 7, the upper surface of the second shielding strip 4 is in close contact with the surface of the arc-shaped conical surface 721. The arc-shaped conical surface 721 has a sufficiently long axial stroke L, which can provide sufficient progressive gathering stroke for the second shielding strip 4. As the second shielding strip 4 is conveyed forward, it smoothly and gradually completes the actions of gathering, automatically aligning and centering, and closing the two side edges. This ensures that the second shielding strip 4 can be smoothly guided and gathered along the arc-shaped conical surface 721 and then covered on the outer surface of the cable core 2 located in the guide channel 722. At the same time, the shoulder 724 formed by the structure can form a limiting block on both sides of the second shielding strip 4, constraining the movement trajectory of the second shielding strip 4, preventing the second shielding strip 4 from contacting the cable core 2 before it is fully gathered at the beginning of the covering stage, avoiding deviation, and ensuring that the bonding width meets the process requirements of 1.5mm-2mm.

[0050] The tear strip 3 is located within the clearance groove 723 area and there is a gap between the lower surface of the tear strip 3 and the bottom of the clearance groove 723. With the help of the space gap formed by the clearance groove 723, the tear strip 3 that has been pasted on the lower side of the cable core 2 can be effectively avoided, preventing the adhesive backing of the tear strip 3 from contacting the surface of the guide channel 722, thus providing a reliable foundation for subsequent bonding of the edge of the second shielding strip 4.

[0051] like Figure 3 As shown, during the longitudinal wrapping process, the second shielding strip 4 gradually converges inward along the arc-shaped conical surface 721, and the arc-shaped conical surface 721 is provided with a guide angle. , The value range is 20°-30°, and 20° is preferred in this embodiment. L is the axial length of the arc-shaped conical surface 721 along the conveying direction of the cable core 2, and the guide angle is... The smaller the diameter, the more gently the second shielding band 4 converges, and the longer the required axial length L of the arc-shaped conical surface 721; guide angle The larger the diameter, the faster the second shielding strip 4 can retract, and the shorter the axial length L of the corresponding arc-shaped conical surface 721 can be. To prevent wrinkles and stretching deformation of the second shielding strip 4 during the retraction process, both conditions must be met. , where H is the radial convergence height of the second shielding strip 4 from the feeding position to the shaping position.

[0052] The connecting block 71 includes a discharge channel 711, which is coaxially arranged with the discharge port 725. The cable core 2, covered with the second shielding strip 4, passes through the discharge channel 711. Figure 3As shown, the diameter of the left end of the discharge channel 711 is slightly larger than the diameter of the discharge port 725, and the diameter of the right end of the discharge channel 711 is slightly smaller than the diameter of the discharge port 725. The overall diameter of the discharge channel 711 is larger than the diameter of the cable core 2. During the process of the semi-finished cable core 2 passing through the discharge channel 711, the hole wall of the discharge channel 711 plays a guiding role for the semi-finished cable core 2, constraining the movement trajectory of the semi-finished cable core 2 and preventing the second shielding strip 4 from springing outward after the cable core 2 leaves the covering head 72. On the other hand, the hole wall of the discharge channel 711 will apply a moderate radial constraint to the second shielding strip 4 after the covering is completed, further gathering and shaping the second shielding strip 4 that is not yet fully attached, so that the two sides of the second shielding strip 4 are continuously pressed and attached to the outer surface of the tear strip 3, making the bonding interface between the second shielding strip 4 and the tear strip 3 more fully and tightly contacted.

[0053] This embodiment also includes a cable manufacturing process for manufacturing cables, specifically comprising the following steps:

[0054] S1. Prepare cable core 2 by twisting multiple sets of conductors 1 together using a twisting machine to obtain cable core 2;

[0055] S2. The tear strip 3 is synchronously conveyed along with the cable core 2, and one side of the tear strip 3 is pasted and fixed to the outer surface of the cable core 2.

[0056] Specifically, the tear strip 3 is unwound through the unwinding mechanism, so that the tear strip 3 and the formed cable core 2 are kept in the same straight line and transported synchronously. During the synchronous transport process, the exposed rubber surface of the tear strip 3, which has completed the single-sided film removal in advance, is precisely aligned with the outer surface of the cable core 2 and pasted and fixed to the outer surface of the cable core 2.

[0057] S3. The second shielding strip 4 is conveyed synchronously with the cable core 2, and the second shielding strip 4 is longitudinally wrapped around the cable core 2. The two sides of the second shielding strip 4 are glued and fixed to the outer surface of the tear strip 3.

[0058] The second shielding tape 4 is unwound through an independent unwinding mechanism and is conveyed synchronously and in the same straight line as the cable core 2 and the tear tape 3. The second shielding tape 4 is gradually gathered and centered by relying on the covering mold 7, so that the second shielding tape 4 is fully wrapped in the longitudinal direction along the length of the cable core 2, and its two sides in the width direction are precisely attached to the outer surface of the fixed tear tape 3.

[0059] S4. The cable core 2 covered with the second shielding strip 4 is fed into the wrapping head device, and the isolation strip 6 is spirally wrapped around the outside of the second shielding strip 4 through the wrapping head device to complete the wrapping and shaping of the cable core 2.

[0060] S5. The outer plastic sheath is extruded by an extruder, and after cooling, the second plastic layer 5 is formed, thus obtaining the finished cable.

[0061] In this embodiment, before step S1, the second shielding band 4 bandwidth selection step is performed:

[0062] Select a section of cable core 2 sample with tear strip 3 pasted on it, and measure several points on the sample to obtain the actual outer perimeter of the sample at the corresponding points. Take the average value as the average perimeter of the sample. The bandwidth of the selected second shielding strip 4 is 0.5mm-1mm smaller than the actual perimeter of the sample. By controlling the bandwidth of the second shielding strip 4 to be 0.5mm-1mm smaller than the average perimeter of the sample, the second shielding strip 4 can be gradually gathered by the arc conical surface 721, and the two sides can just fall within the effective bandwidth range of the tear strip 3. This ensures that the single-sided bonding width is stably within the process range of 1.5mm-2mm after molding, providing a dimensional basis for realizing the preset peel failure sequence and ensuring the stable realization of the cable stripping function.

[0063] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A cable, characterized in that, The cable core (2) includes a tear strip (3), a second shielding strip (4), an isolation strip (6), and a second plastic layer (5). The tear strip (3) is pasted and fixed to the outside of the cable core (2) along the length direction. The second shielding strip (4) is longitudinally wrapped around the outside of the cable core (2) along the length direction. The edge of the second shielding strip (4) in the width direction is fixed to the outer surface of the tear strip (3). The isolation strip (6) is spirally wound around the outside of the second shielding strip (4) along the length direction of the cable core (2). The second plastic layer (5) is wrapped around the outside of the isolation strip (6). The cable core (2) includes multiple sets of conductors (1), which are spirally twisted together. The tear strip (3) includes a substrate layer (34), and aluminum plating layers (35) are laminated on both sides of the substrate layer (34). A first backing adhesive (31) and a second backing adhesive (32) are laminated on the outside of the aluminum plating layers (35) on both sides respectively. The tear strip (3) is bonded and fixed to the surface of the cable core (2) by the first backing adhesive (31). The tear strip (3) is bonded and fixed to the second shielding strip (4) by the second backing adhesive (32). The tear strip (3) is located inside the covering and docking area of ​​the second shielding strip (4) and covers the bonding seam positions of the two sides of the second shielding strip (4). The peel bond strength per unit width between the second backing adhesive (32) and the second shielding strip (4) is greater than the peel bond strength per unit width between the first backing adhesive (31) and the cable core (2).

2. The cable according to claim 1, characterized in that, The breaking force of the tear strip (3) is greater than the total peel force at the interface between the tear strip (3) and the second shielding strip (4), and the total peel force at the interface between the tear strip (3) and the second shielding strip (4) is greater than the total peel force at the interface between the tear strip (3) and the cable core (2).

3. The cable according to claim 1, characterized in that, The thickness of the substrate layer (34) is 15μm-25μm, the width of the tear strip (3) is 4mm-5mm, the thickness of the second shielding strip (4) is 20μm-30μm, and the single-sided bonding width of the second shielding strip (4) and the tear strip (3) is 1.5mm-2mm.

4. The cable according to claim 1, characterized in that, The conductor (1) includes two guide wires (11) and a first shielding strip (12). The two guide wires (11) are spirally twisted together. The first shielding strip (12) is spirally wrapped around the outside of the two twisted guide wires (11). The guide wires (11) include copper wires (111). The copper wires (111) are covered with a first plastic layer (112).

5. A process for manufacturing a cable, used to manufacture the cable as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Prepare cable core (2): multiple sets of conductors (1) are twisted together by a twisting machine to obtain cable core (2); S2. The tear strip (3) is synchronously conveyed along with the cable core (2), and one side of the tear strip (3) is pasted and fixed to the outer surface of the cable core (2); S3. The second shielding strip (4) is transmitted synchronously with the cable core (2), and the second shielding strip (4) is longitudinally wrapped around the cable core (2). The two sides of the second shielding strip (4) are pasted and fixed to the outer surface of the tear strip (3). S4. The cable core (2) covered with the second shielding strip (4) is fed into the wrapping head device. The wrapping head device spirally wraps the isolation strip (6) around the outside of the second shielding strip (4) to complete the wrapping and shaping of the cable core (2). S5. The outer plastic sheath is extruded by an extruder and cooled to form a second plastic layer (5), thus obtaining the finished cable.

6. The cable manufacturing process according to claim 5, characterized in that, Before step S1, perform the second shielding band (4) bandwidth selection step: Select a section of cable core (2) sample with tear strip (3) pasted on it, select several points on the sample for measurement, obtain the actual outer perimeter of the sample at the corresponding points, and take the average value as the average perimeter of the sample. The bandwidth of the selected second shielding strip (4) is 0.5mm-1mm smaller than the actual perimeter of the sample.

7. The cable manufacturing process according to claim 5, characterized in that, Step S3 is completed in the covering mold (7). The covering mold (7) includes a connecting block (71) and a covering head (72). The connecting block (71) is fixedly connected to the covering head (72). The covering head (72) includes an inlet (726) and an outlet (725). The cable core (2), the tear strip (3), and the second shielding strip (4) are simultaneously fed into the inside of the covering mold (7) from the inlet (726) and wrapped into a whole by the covering mold (7) before being sent out from the outlet (725). The tear strip (3) is pasted below the cable core (2). The second shielding strip (4) is located above the cable core (2). The second shielding strip (4) is guided and gathered by the inlet (726) and longitudinally wrapped around the outside of the cable core (2), and is pasted and fixed with the tear strip (3) that has been pasted on the outer surface of the cable core (2).

8. The cable manufacturing process according to claim 7, characterized in that, The feed inlet (726) includes an interconnected arc-shaped conical surface (721), a guide channel (722), and a clearance groove (723). The arc-shaped conical surface (721) has a semi-circular cross-section. The minimum cross-sectional dimension of the arc-shaped conical surface (721) is consistent with that of the guide channel (722). The guide channel (722) is located at the center of the arc-shaped conical surface (721), and shoulders (724) are formed between the two sides of the guide channel (722) and the arc-shaped conical surface (721). The end of the guide channel (722) is connected to the discharge port (725). The cable core (2) passes through the guide channel (722), the upper surface of the second shielding strip (4) is in close contact with the surface of the arc-shaped cone (721), the second shielding strip (4) is gradually guided and gathered along the arc-shaped cone (721) and then covers the outer surface of the cable core (2) located in the guide channel (722), the tear strip (3) is located in the area of ​​the avoidance groove (723) and there is a gap between the lower surface of the tear strip (3) and the bottom of the avoidance groove (723).

9. The cable manufacturing process according to claim 8, characterized in that, It also includes a bracket (8), the connecting block (71) is fixedly connected to the bracket (8), the connecting block (71) includes a discharge channel (711), the discharge channel (711) is coaxially arranged with the discharge port (725), and the cable core (2) covered with the second shielding strip (4) passes through the discharge channel (711).

10. The cable manufacturing process according to claim 8, characterized in that, In step S3, the second shielding strip (4) gradually converges inward along the arc-shaped conical surface (721), and the guide angle of the arc-shaped conical surface (721) is... The value range is 20°-30°, and the axial length of the arc-shaped conical surface (721) along the conveying direction of the cable core (2) is L; Guide angle The smaller the angle, the more gently the second shielding strip (4) converges, and the longer the required axial length L of the arc-shaped conical surface (721); the guide angle The larger the diameter, the faster the second shielding band (4) retracts, and the shorter the axial length L of the corresponding arc-shaped conical surface (721).

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