Dynamic stable shielding signal cable and preparation method thereof

By employing a fused blending interface between an inner shielding layer and a composite shielding layer in the transmission cable, the problem of unstable electromagnetic shielding performance of the transmission cable under dynamic mechanical stress is solved, achieving efficient electromagnetic shielding under dynamic bending conditions and ensuring the stability and reliability of signal transmission.

CN122000128AActive Publication Date: 2026-05-08JIANGSU TONGDING OPTIC-ELECTRONIC TECH CO LTD
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Patent Information

Application Number
CN202610466197.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-10
Publication Date
2026-05-08
Estimated Expiration
2046-04-10

AI Technical Summary

Technical Problem

Existing transmission cables have unstable electromagnetic shielding performance under dynamic mechanical stress. Especially when the equipment is running for a long time and is repeatedly bent, the slippage between the layers leads to unstable contact. It is difficult to balance low-frequency magnetic field shielding materials with flexibility, and high-frequency shielding is prone to leakage. Traditional improvement approaches have failed to change the structural defects of relative displacement between layers.

Method used

The design employs a multi-layer shielding structure, forming an integrated shielding core through the molten blending interface between the inner shielding layer and the composite shielding layer. A step-by-step melting process is used to create mechanical interlocking and chemical bonding between the polymer adhesive layer and the inner shielding layer, buffering modulus differences and ensuring interlayer stability.

Benefits of technology

After 5000 dynamic bending cycles, the shielding effectiveness decayed by no more than 3dB, the interlayer bonding strength was higher than that of the material body, maintaining the stability of electromagnetic shielding and the shielding effect in the high-frequency band, and reducing contact resistance fluctuations and metal layer fatigue.

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Abstract

The invention discloses a dynamic stable shielding signal cable and a preparation method thereof. The cable comprises a conductor, an insulating layer wrapping the conductor and a multi-layer shielding structure wrapping the insulating layer. The multi-layer shielding structure comprises an inner shielding layer and a composite shielding layer; the composite shielding layer is a multi-layer composite belt and comprises a metal conductive layer and at least two polymer bonding layers; a melt blending interface is arranged between the inner shielding layer and the composite shielding layer, and the melt blending interface is formed by combining the polymer bonding layer located in the inner side area with the back face of the inner shielding layer in a molten state and solidifying the polymer bonding layer and the back face of the inner shielding layer. According to the invention, the multiple shielding layers form an integrated structure with cooperative deformation, so that the shielding effectiveness maintaining capability of the cable under a dynamic bending working condition is remarkably improved.
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