Anti-copper foil shielding cracking type flame-retardant coaxial video cable

Abstract

The utility model discloses an anti-copper foil shielding cracking type flame-retardant coaxial video cable, which comprises a stainless steel monofilament conductor, and a plurality of silver-plated copper wires are woven on the outer surface of the stainless steel monofilament conductor and are tightly pressed to form a copper net conductor layer. A PP insulating layer, a copper-plastic composite longitudinal wrapping shielding layer, an ETFE gap wrapping antifriction layer, a tinned copper wire woven shielding layer, a ferrite film inner cushion layer and an irradiation crosslinking high-density polyethylene sheath layer are sequentially wrapped outside the copper net conductor layer, the copper-plastic composite longitudinal wrapping shielding layer is of a copper-plastic composite belt longitudinal lap joint wrapping structure, and the thickness of the copper-plastic composite longitudinal wrapping shielding layer is 16-40 micrometers. The copper-plastic composite belt is formed by bonding a copper foil layer and a PET film base layer into a whole, and the tinned copper wire braided shielding layer is of a structure formed by spirally winding and braiding a plurality of tinned copper wires in reverse directions. In a bending state, the coaxial video cable has better flexibility, is beneficial to inhibiting the copper foil shielding layer from cracking, ensures stable signal transmission characteristics, improves high-definition video transmission quality, and has better durability.

Description

Technical Field

[0001] The present application belongs to the field of cable technology, and in particular relates to an anti-copper foil shielding cracking type flame-retardant coaxial video cable. Background Art

[0002] Among the mainstream high-definition video interfaces in electronic display devices, the SDI and HDMI interfaces have the highest popularity and the best performance, especially in high-definition video transmitters, high-definition camera equipment and high-definition display equipment. The SDI interface is the abbreviation of "Serial Digital Interface", which means serial digital interface in Chinese. The technical principle of the SDI interface is to use a single channel transmission interface to transmit each bit and corresponding data between data. The SDI interface is a professional video signal transmission interface type, commonly used for broadcast-level video equipment connection, using ordinary 75-ohm coaxial cable transmission, and is used in banks, hospitals, schools, highways, smart buildings, etc. It is suitable for on-site monitoring and fast control and playback. The shielding layer of this type of coaxial video cable is generally a double shielding structure of copper foil shielding and metal wire braided shielding. When bent, friction occurs between the copper foil and the metal wire, which can easily cause the copper foil shielding layer to crack. At the same time, in the bent state, due to the different tensile elastic modulus between the outer sheath and the insulating layer, the shielding layer bends in contact with the insulating layer. However, the outer sheath is generally not very soft, which can easily cause the inner surface of the outer sheath to not completely bend in contact with the shielding layer, resulting in a large local load on some of the fitting parts, causing local stress concentration on the copper foil, which can easily cause the copper foil shielding layer to crack and make the signal transmission characteristics unstable, affecting the normal high-definition video transmission quality and not durable. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a flame-retardant coaxial video cable with an anti-copper foil shielding cracking property, which has better flexibility and can reduce the local stress concentration of the copper foil shielding layer in a bent state, inhibit the cracking of the copper foil shielding layer, ensure stable signal transmission characteristics, improve the quality of high-definition video transmission, and have better durability.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] The anti-copper foil shielded cracking type flame-retardant coaxial video cable comprises a stainless steel monofilament conductor, on the outer surface of which a copper mesh conductor layer is formed by weaving and pressing a plurality of silver-plated copper wires, the outside of which is sequentially coated with a PP insulation layer, a copper-plastic composite longitudinally wrapped shielding layer, an ETFE gap-wrapped friction-reducing layer, a tinned copper wire braided shielding layer, a ferrite film inner cushion layer and an irradiated cross-linked high-density polyethylene sheath layer, the copper-plastic composite longitudinally wrapped shielding layer is a copper-plastic composite tape longitudinally overlapped wrapped structure with a thickness of 16 μm to 40 μm, the copper-plastic composite tape is a copper foil layer and a PET film base layer bonded together, and the tinned copper wire braided shielding layer is a braided structure of a plurality of tinned copper wires spirally wound in opposite directions.

[0006] Preferably, the diameter of the silver-plated copper wire is 0.01 mm to 0.05 mm and is smaller than the diameter of the stainless steel single wire conductor.

[0007] Preferably, the copper foil layer has a thickness of 8 μm to 10 μm, and the PET film base layer has a thickness of 15 μm to 30 μm.

[0008] Preferably, the PP insulation layer has a thickness of 0.1 mm to 1 mm.

[0009] Preferably, the thickness of the ETFE gap-wrapped friction-reducing layer is 10 μm to 25 μm.

[0010] Preferably, the thickness of the inner cushion layer of the ferrite film is 0.1 mm to 0.5 mm.

[0011] Preferably, the tinned copper wire has a wire diameter of 0.02 mm to 0.04 mm.

[0012] Preferably, the braiding density of the tinned copper wire braided shielding layer is not less than 85%.

[0013] Preferably, a thermoplastic polyurethane adhesive layer is provided on the inner surface of the radiation cross-linked high-density polyethylene sheath layer.

[0014] Preferably, the radiation cross-linked high-density polyethylene sheath layer has a thickness of 0.3 mm to 1 mm.

[0015] Beneficial effects of this application:

[0016] 1. A double-layer shielding structure of copper-plastic composite longitudinal shielding and tinned copper wire braided shielding is adopted. The longitudinal shielding structure of the copper-plastic composite tape has better bending resistance. The ETFE gap-wrapped anti-friction layer is added to provide anti-friction effect, which is beneficial to reduce the direct contact friction between the copper foil layer and the tinned copper wire, alleviate the stress concentration of the copper foil, and inhibit the cracking and failure of the copper foil layer. In addition, the flexibility is improved by adding a ferrite film inner cushion layer. When bending, the ferrite film inner cushion layer can better fit the bending of the shielding layer, eliminating the problem of cracking of the shielding layer caused by the partial fit of the outer sheath to the bending of the shielding layer, thereby ensuring the stability of the shielding effect and better durability.

[0017] 2. The inner core of the conductor is made of stainless steel monofilament conductor to maintain both mechanical strength and tensile resistance. The outer surface of the stainless steel monofilament conductor is woven and pressed by silver-plated copper wire to form a copper mesh conductor layer. The copper mesh conductor layer with a close-fitting structure has better flexibility and will not be loose, which is beneficial to enhance the cable's anti-bending properties, ensure the quality of high-definition video transmission, and have better durability and applicability.

[0018] 3. The ferrite film inner cushion layer and the radiation cross-linked high-density polyethylene sheath layer are bonded together by an adhesive layer. When bent, the radiation cross-linked high-density polyethylene sheath layer and the ferrite film inner cushion layer maintain the same degree of bending and fit closely to the shielding layer, which inhibits the shielding layer from bearing excessive load locally, reduces local stress concentration in the shielding layer, avoids cracking of the copper foil layer, ensures the stability of the shielding effect, and has better durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 1-stainless steel monofilament conductor, 2-copper mesh conductor layer, 3-PP insulation layer, 4-copper plastic composite longitudinal shielding layer, 5-ETFE gap wrapped anti-friction layer, 6-tinned copper wire braided shielding layer, 7-ferrite film inner cushion layer, 8-irradiated cross-linked high-density polyethylene sheath layer. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0023] See also Figure 1The anti-copper foil shielded cracking flame-retardant coaxial video cable of the embodiment of the present application includes a stainless steel monofilament conductor 1, on the outer surface of which a copper mesh conductor layer 2 is formed by weaving and pressing a plurality of silver-plated copper wires. Furthermore, the wire diameter of the silver-plated copper wire is 0.01 mm to 0.05 mm and is smaller than the diameter of the stainless steel monofilament conductor 1.

[0024] The copper mesh conductor layer 2 is coated with a PP insulation layer 3, a copper-plastic composite longitudinal shielding layer 4, an ETFE gap-wrap anti-friction layer 5, a tinned copper wire braided shielding layer 6, a ferrite film inner cushion layer 7 and an irradiated cross-linked high-density polyethylene sheath layer 8 in sequence. Furthermore, the inner surface of the irradiated cross-linked high-density polyethylene sheath layer 8 is provided with a thermoplastic polyurethane adhesive layer. The PP insulation layer 3 has a thickness of 0.1 mm to 1 mm. The copper-plastic composite longitudinal shielding layer 4 is a copper-plastic composite tape longitudinally overlapped wrapping structure with a thickness of 16 μm to 40 μm. The copper-plastic composite tape is a copper foil layer and a PET film base layer bonded together. Specifically, the copper foil layer has a thickness of 8 μm to 10 μm, and the PET film base layer has a thickness of 15 μm to 30 μm. The ETFE gap-wrap anti-friction layer 5 has a thickness of 10 μm to 25 μm. The tinned copper wire braided shielding layer 6 is a braided structure of a plurality of tinned copper wires spirally wound in opposite directions. Furthermore, the diameter of the tinned copper wire is 0.02 mm to 0.04 mm, and the braiding density of the tinned copper wire braided shielding layer 6 is not less than 85%. The thickness of the ferrite film inner cushion layer 7 is 0.1 mm to 0.5 mm. The thickness of the irradiated cross-linked high-density polyethylene sheath layer 8 is 0.3 mm to 1 mm.

[0025] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. Anti-crack copper foil shielded flame retardant coaxial video cable, its characteristics are: The invention comprises a stainless steel monofilament conductor (1), on the outer surface of which a copper mesh conductor layer (2) is formed by weaving and pressing a plurality of silver-plated copper wires, the copper mesh conductor layer (2) is coated with a PP insulation layer (3), a copper-plastic composite longitudinally wrapped shielding layer (4), an ETFE intermittently wrapped friction reduction layer (5), a tinned copper wire braided shielding layer (6), a ferrite film inner cushion layer (7) and an irradiated cross-linked high-density polyethylene sheath layer (8) in sequence, the copper-plastic composite longitudinally wrapped shielding layer (4) being a copper-plastic composite tape longitudinally overlapped wrapped structure with a thickness of 16 μm to 40 μm, the copper-plastic composite tape being a copper foil layer and a PET film base layer bonded together, and the tinned copper wire braided shielding layer (6) being a braided structure of a plurality of tinned copper wires mutually spirally wound in opposite directions.

2. The anti-copper foil shielded cracking flame-retardant coaxial video cable according to claim 1 is characterized in that: The diameter of the silver-plated copper wire is 0.01 mm to 0.05 mm and is smaller than the diameter of the stainless steel monofilament conductor (1).

3. The anti-copper foil shielded cracking flame-retardant coaxial video cable according to claim 1 is characterized in that: The copper foil layer has a thickness of 8 μm to 10 μm, and the PET film base layer has a thickness of 15 μm to 30 μm.

4. The anti-copper foil shield cracking flame-retardant coaxial video cable according to claim 1 is characterized in that: The PP insulation layer (3) has a thickness of 0.1 mm to 1 mm.

5. The anti-copper foil shielded cracking flame-retardant coaxial video cable according to claim 1 is characterized in that: The thickness of the ETFE gap-wrapped anti-friction layer (5) is 10 μm to 25 μm.

6. The anti-copper foil shield cracking flame-retardant coaxial video cable according to claim 1, characterized in that: The thickness of the ferrite film inner cushion layer (7) is 0.1 mm to 0.5 mm.

7. The anti-copper foil shield cracking flame-retardant coaxial video cable according to claim 1, characterized in that: The diameter of the tinned copper wire is 0.02 mm to 0.04 mm.

8. The anti-copper foil shield cracking flame-retardant coaxial video cable according to claim 1, characterized in that: The braiding density of the tinned copper wire braided shielding layer (6) is not less than 85%.

9. The anti-copper foil shield cracking flame-retardant coaxial video cable according to claim 1, characterized in that: The inner surface of the radiation cross-linked high-density polyethylene sheath layer (8) is provided with a thermoplastic polyurethane adhesive layer.

10. The anti-copper foil shield cracking flame-retardant coaxial video cable according to claim 1, characterized in that: The thickness of the radiation cross-linked high-density polyethylene sheath layer (8) is 0.3 mm to 1 mm.

Images