Cables

Abstract

The utility model discloses a cable, it includes a pair of core wire of horizontal direction contact setting, the first insulating layer of cladding the pair of core wire, the second insulating layer of cladding the first insulating layer, the shielding layer of cladding the second insulating layer and the outer insulating layer of cladding the shielding layer, the first insulating layer is with spiral winding mode cladding in the pair of core wire out, the second insulating layer is with the mode cladding in the first insulating layer out of extrusion forming, the first insulating layer and second insulating layer all adopt fluorine -free material to make. The utility model cable electrical property and the bending -resistant performance are good, and can satisfy the environmental protection requirement of no PFAS.

Description

[Technical Field]

[0001] This utility model relates to a cable, and more particularly to a high-speed signal cable for transmitting high-frequency signals. [Background Technology]

[0002] Chinese Utility Model Patent No. CN220627428U discloses a cable comprising a pair of core wires, a first insulation layer covering the pair of core wires, and a second insulation layer covering the first insulation layer. The first insulation layer is extruded and formed outside the pair of core wires. During the extrusion forming process, the temperature can reach 200 degrees Celsius. The high temperature can damage the core wires, affecting the SI performance of the cable and thus affecting the integrity of signal transmission in the cable.

[0003] Therefore, it is necessary to provide a new type of cable with stable signal transmission. [Utility Model Content]

[0004] The main purpose of this utility model is to provide a cable with good electrical properties and bending resistance, and which can meet the environmental protection requirements of being PFAS-free.

[0005] To achieve the above objectives, the present invention can adopt the following technical solution: a cable, comprising a pair of core wires arranged in a transverse direction, a first insulating layer covering the pair of core wires, a second insulating layer covering the first insulating layer, a shielding layer covering the second insulating layer, and an outer insulating layer covering the shielding layer, wherein the first insulating layer is spirally wound around the pair of core wires, and the second insulating layer is extruded around the first insulating layer, and both the first insulating layer and the second insulating layer are made of fluorine-free material.

[0006] Compared with the prior art, the present invention has the following advantages: the first insulation layer is wrapped around the pair of core wires in a spiral winding manner, and the second insulation layer is wrapped around the first insulation layer in an extrusion molding manner. Both the first insulation layer and the second insulation layer are made of fluorine-free material, which not only makes the electrical performance and bending resistance of the cable better, but also meets the environmental protection requirements of PFAS-free. [Attached Image Description]

[0007] Figure 1 This is a cross-sectional view of the cable conforming to this utility model.

[0008] [Explanation of Key Component Symbols]

[0009] 100 wires per cable, 10 cores per wire

[0010] First insulating layer 20 Second insulating layer 30

[0011] Shielding layer 40, outer insulation layer 50

[0012] Ground wire 60, inner conductor 11

[0013] Inner insulation layer 12, air gap 21

[0014] Inner layer 51 Outer layer 52

Detailed Implementation Methods

[0015] Please see Figure 1 The image shows a cable 100 conforming to this utility model. The cable 100 includes a pair of core wires 10, a first insulation layer 20 covering the pair of core wires 10, a second insulation layer 30 covering the first insulation layer 20, a shielding layer 40 covering the second insulation layer 30, an outer insulation layer 50 covering the shielding layer 40, and a ground wire 60 disposed between the outer insulation layer 50 and the shielding layer 40.

[0016] The pair of core wires 10 are each manufactured separately for easy size control and management. Each of the pair of core wires 10 has a circular cross-section. The pair of core wires 10 are arranged laterally and are in contact with each other. Each of the pair of core wires 10 includes an inner conductor 11 and an inner insulation layer 12 extruded over the inner conductor 11. The inner conductor 11 is used to transmit high-speed signals. The inner conductor 11 is made of silver-plated copper, tin-plated copper, or alloy copper. The inner insulation layer 12 is made of PP, PE, foamed PP, or foamed PE.

[0017] The first insulating layer 20 is spirally wound around the pair of core wires 10. Air gaps 21 are formed between the first insulating layer 20 and the upper and lower sides of the pair of core wires 10. The first insulating layer 20 is made of foamed material. Specifically, in this invention, the first insulating layer 20 is foamed PP or foamed PE. The first insulating layer 20 is first extruded into a sheet-like wrapping tape, and then wrapped around the core wires 10. The wrapping of the first insulating layer 20 around the pair of core wires 10 is performed at room temperature, avoiding the direct extrusion onto the pair of inner conductors 11 in the prior art, which causes damage to the core wires 10 at high temperatures. Furthermore, the wrapping facilitates bending of the cable 100. The first insulating layer 20 is made of foamed material; under the same impedance, foamed material has a smaller dielectric constant than non-foamed material, which can reduce attenuation and improve signal integrity in the cable 100. Furthermore, using foamed material allows for a smaller overall outer diameter of the cable 100 while ensuring overall impedance matching. The first insulating layer 20 can be configured with 1 to 6 layers. Preferably, in this invention, the first insulating layer 20 can be configured as at least two layers. The different layers of the first insulating layer 20 are wound in different directions to eliminate stress from each other, making the cable 100 structure more stable. The multi-layer wrapping of the first insulating layer 20 makes the cable 100 more flexible and easier to bend.

[0018] The second insulating layer 30 is extruded and molded over the first insulating layer 20. The material of the second insulating layer 30 is any one of PP, PE, foamed PP, and foamed PE. In this invention, because the first insulating layer 20 is wrapped around a pair of core wires 10, a gap will be generated at the joint. When the cable 100 is bent, the gap will change due to the difference in the inner and outer radii of the bend, which will cause a change in impedance. Therefore, the second insulating layer 30, which is extruded and molded, is used to cover the first insulating layer 20 to protect the first insulating layer 20 and improve the bending resistance of the cable 100.

[0019] The ground wire 60 includes a pair. The pair of ground wires 60 are disposed on both sides in the lateral direction. The ground wire 60 is made of tin-plated copper or silver-plated copper. In other embodiments, only one ground wire 60 may be provided.

[0020] The shielding layer 40 is wrapped around the second insulating layer 30 in a longitudinally wrapped manner or in a spirally wound manner. The shielding layer 40 is any one of aluminum-coated PET (polyethylene terephthalate), aluminum-coated PP, aluminum-coated PP, copper strip, copper-coated PI (polyimide), copper-coated PET, and copper-aluminum composite strip. The copper-aluminum composite strip includes an intermediate layer, a copper layer on one side of the intermediate layer, and an aluminum layer on the other side of the intermediate layer. The copper layer is formed by rolling, and the aluminum layer is plated on the other side of the intermediate layer.

[0021] The outer insulation layer 50 is made of two layers: the inner layer 51 is a PET material wrapping tape, and the outer layer 52 is a PI material wrapping tape. The outer insulation layer 50 is wrapped around the shielding layer 40.

[0022] Due to the inherent properties of materials, if fluorinated materials are used, the impedance change rate of cable 100 will be relatively large when bent. All insulation materials in cable 100 of this invention are made of fluorine-free materials, which not only meets the environmental requirements of being free of PFAS (per- and polyfluoroalkyl substances), but also makes the impedance change rate of cable 100 smaller when bent, allowing for a smaller bending radius, thus improving the bending resistance of cable 100 and making it suitable for use in confined spaces within servers or other applications.

[0023] The first insulating layer 20 of this invention wraps around the pair of core wires 10, and the second insulating layer 30 is extruded and wrapped around the first insulating layer 20, making the cable 100 structure more stable and having better bending resistance. Furthermore, the inner insulating layer 12, the first insulating layer 20, the second insulating layer 30, and the outer insulating layer 50 are all made of fluorine-free material, which can meet the environmental protection requirements of PFAS-free and further improve the bending resistance of the cable 100.

Claims

1. A cable comprising a pair of core wires disposed in contact in a transverse direction, a first insulating layer covering the pair of core wires, a second insulating layer covering the first insulating layer, a shielding layer covering the second insulating layer, and an outer insulating layer covering the shielding layer, characterized by: The first insulation layer is spirally wrapped outside the pair of core wires, the second insulation layer is extruded outside the first insulation layer, and the first insulation layer and the second insulation layer are both made of fluorine-free materials.

2. The cable of claim 1, wherein: The first insulation layer is made of foaming material.

3. The cable of claim 2, wherein: The first insulation layer is foaming PP or foaming PE.

4. The cable of claim 1, wherein: The first insulation layer is provided as at least two layers, and adjacent two layers are spirally wrapped in different directions.

5. The cable of claim 1, wherein: Each of the pair of core wires comprises an inner conductor and an inner insulation layer extruded outside the inner conductor, and a cross-sectional shape of each of the pair of core wires is circular.

6. The cable of claim 5, wherein: The inner conductor is made of one of silver-plated copper, tin-plated copper or alloyed copper, and the inner insulation layer is made of any one of PP, PE, foaming PP and foaming PE.

7. The cable of claim 1, wherein: The second insulation layer is made of any one of PP, PE, foaming PP and foaming PE.

8. The cable of claim 1, wherein: The shielding layer is any one of aluminum-coated PET, aluminum-coated PP, copper strip, copper-coated PI, copper-coated PET and copper-aluminum composite strip.

9. The cable of claim 1, wherein: Further comprising a pair of ground wires provided between the shielding layer and the outer insulation layer, the pair of ground wires are provided on both sides in a transverse direction of the shielding layer, and the ground wires are made of tin-plated copper or silver-plated copper.

10. The cable of claim 1, wherein: The outer insulation layer is provided as two layers, an inner layer is a PET material tape, and an outer layer is a PI material tape.

Images