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Unidirectional Carbon Fiber Fabric

 
Unidirectional Carbon Fiber Fabric (UD fabric for short) is a high-performance composite material. The core is carbon fiber filaments formed by high-temperature pre-oxidation and carbonization treatment of polyacrylonitrile (PAN) precursor filaments, which are neatly arranged in a single direction (usually the warp direction). In the other direction (weft direction), it is slightly fixed and woven with high-strength hot melt adhesive thread or fine yarn. Its unique unidirectional fiber structure enables the product's strength to be almost entirely concentrated in the direction of fiber arrangement, maximizing the high tensile strength of carbon fiber and achieving the core advantages of "precise force application and efficient load-bearing".
 
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Core Advantage

1. The fibers are closely arranged in a single direction. The tensile strength at 0° can reach 3500MPa, and its specific strength is 16 times that of steel and 12 times that of aluminum alloy. It can provide an extremely strong load-bearing capacity with a very small weight proportion, perfectly meeting the strengthening requirements of the main load-bearing structure. At the same time, its elastic modulus is close to that of steel, and it has good load-bearing synergy with substrates such as concrete and metal, without stress concentration due to performance differences.


2. The lightweight advantage is significant and energy consumption is optimized

Its density is only 1.7-1.8g/cm³, which is much lower than that of steel (7.8g/cm³) and aluminum alloy (2.7g/cm³). When applied in fields such as aerospace and automobiles, it can significantly reduce the self-weight of products. For instance, reducing the weight of aircraft components can enhance flight efficiency and lower fuel consumption, while reducing the weight of automotive parts can optimize range and power performance.


3. Resistant to extreme environments and long-lasting stability

It has excellent corrosion resistance and can withstand the erosion of strong corrosive media such as concentrated hydrochloric acid and phosphoric acid. Its corrosion resistance is superior to that of gold and platinum, making it suitable for structural reinforcement in harsh environments such as coastal areas and chemical plants. It can also withstand sudden temperature changes. It does not crack when the temperature drops sharply from 3000℃ to room temperature and remains elastic at -180℃. Its performance is stable in extreme temperature variation scenarios.


4. It is convenient and efficient to construct and has wide adaptability

The product is soft, thin and light, and can be cut to any size. It can closely adhere to complex curved surfaces such as beams, columns and arc-shaped components, with 100% effective adhesion. Even if the surface is slightly uneven, it can still ensure the adhesion. The construction does not require large machinery, there is no wet work, the construction period is short, and the weight per square meter (including glue) after laying is less than 1.0kg. It basically does not increase the self-weight and external dimensions of the structure, and does not affect the appearance of the original structure.


5. High cost performance and controllable cost

Compared with bidirectional carbon fiber cloth, the weaving process of unidirectional cloth is simpler, and its price is 15% to 30% lower under the same weight. Moreover, due to its precise force application, there is no need to waste fiber materials in non-force directions. The material utilization rate exceeds 90%, which can ensure the reinforcement effect while reducing project costs.


Product Application

  • Aerospace field

    It is used for core components such as aircraft fuselage skins, wings, tails, rocket boosters, missile casings, and satellite antenna brackets. With its lightweight and high-strength features, it reduces energy consumption during launch and flight, and enhances the structural stability and safety reliability of aircraft.


  • Field of building reinforcement

    It is suitable for the reinforcement and strengthening of concrete structures such as beams, columns, slabs, Bridges, tunnels and chimneys. In the reinforcement of coastal buildings, its corrosion resistance can effectively extend the service life of the structure and prevent structural failure caused by the corrosion of steel bars.


  • In the automotive industry

    It is used for racing car bodies, high-end car components (such as chassis and drive shafts), battery pack casings of new energy vehicles, etc., reducing the weight of the vehicle body while enhancing structural strength and collision safety.


  • New energy equipment field

    The core is applied to components such as wind turbine blades and hydrogen storage cylinders. After the wind turbine blades are unidirectionally distributed, the wind load resistance capacity of the blades can be enhanced, while reducing the weight of the blades and optimizing the power generation efficiency. After being reinforced with unidirectional fabric, hydrogen storage cylinders can achieve lightweight while ensuring pressure resistance, thereby enhancing portability.

Technical Parameters

Material100% carbon fiber
Weight200g/㎡, 300g/㎡ (standard); 150-400g/㎡ (customizable)
Widthranges from 10 to 1000mm. Other widths can be customized as required
Colorblack. Other colors can be customized
Fiber types1k/3k/6k/12k
Customized serviceOEM ODM Customize


FAQ

1. What are the differences between unidirectional carbon fiber fabric and bidirectional carbon fiber fabric? How to choose?

The core difference lies in the arrangement of fibers and the direction of force application: Unidirectional fabric fibers are only arranged in one direction, mainly focusing on high-strength load-bearing in a single direction. The bidirectional fabric fibers are interwoven along 0°/90° or ±45°, taking into account multi-directional force, and have better shear and tear resistance. Selection logic: If it is a single-direction force application scenario such as beam bending resistance, column compressive resistance, or main force reinforcement of a bridge, it is preferred to choose a unidirectional layout (which offers better cost performance). For multi-directional force-bearing scenarios such as beam-column joints, irregular components, and seismic reinforcement, bidirectional distribution is preferred.


2. What key points should be noted during construction?

① Surface treatment of the substrate: It is necessary to ensure that the surface roughness Ra reaches 2.5-5.0μm, and remove floating dust and oil stains. ② Cutting tools: It is recommended to use diamond-coated tools to avoid fiber scattering. ③ Layup positioning: The deviation of the fiber direction should be controlled within ±1° to ensure the accuracy of the force direction. ④ Curing parameters: The vacuum bag pressure curing pressure is 0.6-0.8MPa, the curing temperature of the epoxy resin system is 120-180℃, and it is held for 2-4 hours. After curing, the porosity should be controlled below 2%. ⑤ Curved surface tiling: For complex curved surfaces, layers should be laid in sections and immediately rolled. The tension in the convex areas should be reduced (10-20 CN /mm), and that in the concave areas should be appropriately increased (30-50 CN /mm) to prevent fiber buckling.


3. How should the product be stored to ensure stable performance?

It should be stored in a dry, well-ventilated and cool environment, avoiding direct sunlight and damp conditions (relative humidity ≤60%), and kept away from fire sources and corrosive gases. Unidirectional fabrics that have not been impregnated with resin need to be sealed and packaged to prevent the fibers from getting damp. The prepreg type unidirectional fabric should be stored frozen at -18℃. Thaw it in advance before use to avoid repeated freezing and thawing affecting the performance of the resin.


4. Can the specifications of carbon fiber unidirectional fabric be customized?

Sure. The standard width is 100-500mm. Other widths can be customized as needed. The surface density can be adjusted within the range of 150-400g/㎡. Meanwhile, parameters such as fiber grade (like T300, T700) and resin system (toughened type, low-viscosity type) can be customized according to customer requirements to meet the performance demands of different scenarios.


5. How should it be handled if delamination occurs between layers after use?

First, the delamination range is detected by ultrasonic C-scan (frequency 5-10 MHZ) : ① Micro-delamination (diameter < 5mm) : Repair is carried out by injecting low-viscosity epoxy adhesive (viscosity < 100cP) + vacuum compaction. ② Severe delamination: Locally remove the damaged area and use a secondary curing repair method of "unidirectional fabric + fabric mixed patch". After the repair, re-test to ensure that the performance meets the standards.

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