Detailed Explanation of Flame-Retardant Single-Sided Shielding Aluminum Foil (AL+Flame Retardant+PET) for Cable Shielding Layers

In the field of cable manufacturing, the shielding layer is a core structure to ensure stable cable signal transmission and avoid electromagnetic interference. As a key raw material for high-end cables, the flame-retardant single-sided shielding aluminum foil, with its composite structure of "AL+Flame Retardant+PET", combines multiple advantages of shielding, flame retardancy and mechanical protection, and is widely used in scenarios with strict requirements on safety and performance such as power, communication, new energy and industrial control. Its scientific and reasonable structural design and synergistic effect of each layer not only solve the pain point of insufficient flame retardancy of traditional aluminum foil shielding, but also make up for the performance shortcomings of a single material, becoming the preferred material for the shielding layer of modern high-end cables.

The flame-retardant single-sided shielding aluminum foil for cable shielding layers has a core structure of a single-sided composite structure of "AL (aluminum foil layer) + flame retardant + PET (polyester film layer)". The three layers are closely bonded and synergistically empowered, and each layer plays a key role and is indispensable. Among them, the AL aluminum foil layer, as the core shielding layer, is made of high-purity 1xxx or 8xxx series aluminum foil (usually 15-40μm thick), which has excellent electrical conductivity and electromagnetic shielding efficiency. The shielding attenuation can reach more than 40dB at 100MHz, which can effectively block external electromagnetic interference (EMI) and radio frequency interference (RFI), and reduce crosstalk of internal cable signals, ensuring the stability of power transmission and signal transmission, and is the core carrier of shielding function.

The middle flame retardant layer is the core to realize the flame retardant performance of the product. It adopts an environmentally friendly and efficient flame retardant formula, which is evenly coated between the aluminum foil and the PET layer. It can not only quickly form a flame-retardant carbon layer in high-temperature and open-flame environments to prevent flame spread, but also effectively inhibit smoke generation, complying with domestic and foreign flame retardant standards such as GB/T 19666 and ASTM E-84, and can meet fire protection level requirements of different scenarios. This layer of flame retardant has strong compatibility with aluminum foil and PET layer, will not affect the adhesion of the overall structure, and has the characteristics of odorless, environmental protection and non-toxicity, conforming to the green, low-carbon, safe and environmental protection development trend of the modern cable industry, and reducing cable fire hazards from the source.

As the base support layer, the PET polyester film layer is controlled at 12-25μm in thickness, which has excellent mechanical properties and chemical stability, provides reliable support for the overall structure, and effectively makes up for the shortcomings of aluminum foil such as brittleness and easy tearing. The PET layer has a smooth surface and good dimensional stability, with low shrinkage rate, which can improve the adhesion of the aluminum foil layer, avoid the aluminum foil from falling off, scratching, damaging and other problems during cable processing (winding, cutting), laying and use; at the same time, the PET layer has good temperature resistance, with a long-term service temperature stable at -40℃~130℃, which can adapt to complex environments such as outdoors, high temperature and low temperature, further extending the service life of aluminum foil and cables, and also playing an auxiliary insulation role to improve the overall safety of cables.

The composite structure of "AL+Flame Retardant+PET" enables this type of aluminum foil to form core advantages different from traditional shielding aluminum foil, perfectly adapting to the use needs of high-end cables. First, it integrates dual functions of shielding and flame retardancy, which not only achieves efficient electromagnetic shielding to ensure signal transmission is not interfered, but also has excellent flame retardant performance to effectively prevent fire risks, especially suitable for scenarios with high temperature, high interference and high fire protection requirements; second, it has excellent mechanical properties, combining the conductivity of aluminum foil and the flexibility of PET, with high tensile strength and good toughness, and the bending radius can reach 6-8 times the cable outer diameter, adapting to cable winding, bending and other processing procedures, not easy to be damaged, reducing losses during production and use; third, it has outstanding cost performance. Compared with copper foil shielding materials, this type of aluminum foil is lighter (about 0.1kg/m) and lower in cost, while its shielding and flame retardant performance is not inferior. It can control the manufacturing cost of cables while improving product competitiveness, and at the same time meet environmental protection standards, complying with global environmental protection policy requirements.

Combined with the needs of industry applications, the flame-retardant single-sided shielding aluminum foil (AL+Flame Retardant+PET) has a wide range of application scenarios. In the field of power cables, it is mainly used for the shielding layer of medium and high voltage power cables, especially suitable for high-voltage cables of new energy vehicles and UHV cables. It can not only ensure stable power transmission, but also meet the fire safety requirements of vehicles and power projects; in the field of communication cables, it is used for the shielding layer of data cables, network cables and communication optical cables, effectively blocking external electromagnetic interference, ensuring the clarity and stability of signal transmission, and adapting to scenarios such as data centers and communication base stations; in the field of industrial control and special cables, it is suitable for cables in scenarios such as mining, rail transit and medical equipment. With its excellent flame retardant and shielding performance, it adapts to complex and harsh use environments and ensures the safe and stable operation of equipment.

With the development of the cable industry towards high-end, safety and environmental protection, especially the rapid rise of new energy, UHV, intelligent buildings and other fields, the market's requirements for the flame retardancy, shielding performance and environmental protection of cable shielding layer materials are constantly improving. The flame-retardant single-sided shielding aluminum foil with "AL+Flame Retardant+PET" structure, with its scientific structural design and excellent comprehensive performance, perfectly conforms to the industry development trend, and gradually replaces the traditional ordinary shielding aluminum foil, becoming the core raw material for high-end cable manufacturing. In the future, with the continuous optimization of flame retardant technology and composite processes, this type of aluminum foil will further improve its flame retardant grade, shielding efficiency and mechanical properties, expand more high-end application scenarios, and provide reliable raw material support for the high-quality development of the cable industry.