1. Core definition and functional integration Definition: A metal tape with high-purity copper foil (≥99.98% Cu) as the base material, coated with a black functional coating (such as matte black ink, nano-carbon material) on one side and a conductive adhesive (such as acrylic adhesive, silicone) on the other side. It belongs to single-conductor copper foil tape (the adhesive surface is non-conductive, only the copper surface is conductive), and it has multiple functions such as electromagnetic shielding, conduction, light blocking and heat dissipation.
Core functions Electromagnetic shielding: The excellent electrical conductivity of copper foil enables the shielding of electrical signals (with a wide frequency range), and the nickel-containing substances in the adhesive layer can enhance magnetic shielding, effectively isolating EMI/RFI interference and protecting the stable operation of electronic equipment. Conduction and grounding: The copper surface provides a low-resistance path, suitable for grounding electronic components, electromagnetic isolation of high-frequency transmission lines, and static discharge. Light-blocking and decoration: The black coating (such as nano-carbon, matte black ink) achieves 100% light-blocking, preventing light leakage from the sides, while enhancing the product's aesthetic appeal. It is suitable for scenarios such as display screens and electronic product casings. Heat dissipation and temperature resistance: The nano-carbon coating enhances the thermal radiation efficiency (reducing the overall temperature by 6 to 15 degrees Celsius), with a temperature resistance range of -10 degrees Celsius to 120 degrees Celsius (short-term up to 200 degrees Celsius), making it suitable for high-temperature industrial environments.
2. Material systems and structures Base material: Electrolytic copper foil/rolled copper foil, thickness 0.018mm-0.1mm, purity ≥99.98%, surface treated by etching/rolling to optimize roughness (Ra≤1.5μm). Coating system Black functional layer: matte black ink (acrylic), nano-carbon thermal conductive coating (thermal conductivity ≥2500 W/(m·K)), or carbon nanotube composite layer, providing light-blocking, heat dissipation and UV resistance performance. Adhesive layer: Conductive acrylic adhesive (surface resistance ≤0.05Ω/square), silicone or pressure-sensitive adhesive, peel force 1.0-1.5kg/25mm, ensuring a balance between bonding strength and conductivity. Auxiliary layer: Release paper (transparent/semi-transparent) protective adhesive layer, to be peeled off when in use; Optional anti-static layer and weather-resistant coating enhance environmental adaptability. Typical structure: Substrate layer → black coating → adhesive layer → release paper. The multi-layer composite is integrated through hot pressing /UV curing.
3. Processing technology and technological innovation Precision coating technology Coating application: Black ink/nano-carbon layer is evenly applied by letterpress printing, micro-concave coating or electrophoretic deposition technology, with a thickness control accuracy of ±0.5μm. Adhesive coating: Conductive adhesive is transferred and coated on the anilox roller. The UV curing energy is ≥300mJ/cm² to ensure the compactness of the adhesive layer and the conversion rate of double bonds.
Composite and slitting Multi-layer lamination: The base material, coating and release paper are laminated under pressure through the lamination wheel. After cooling, the edges are cut and wound up to ensure the interlayer adhesion and dimensional stability. Precision slitting: Laser cutting or gradient window opening, suitable for fine structures such as pads and vias, to avoid peeling or poor welding.
Environmental protection and sustainable processes Water-based UV coatings replace oil-based lubricants, reducing VOC emissions. Bio-based silicone oil and degradable substrates (such as PLA) reduce carbon footprints. The automated production line integrates AI defect recognition (recognition rate ≥99.5%) to monitor the coating amount, peel force and surface defects in real time.
4. Performance Parameters and Quality Control Key performance indicators Conductivity: The resistance of the copper surface is ≤0.05Ω/square, and the conductivity of the adhesive layer meets the requirements of electromagnetic shielding. Temperature resistance: Long-term use from -10℃ to 120℃, short-term temperature resistance up to 200℃, thermal shrinkage rate ≤0.041%. Adhesive force: 180° Peel force 1.0-1.5kg/25mm, steel surface bonding strength ≥7N/cm (after 14 days). Light-blocking property: Light transmittance ≤1%, completely blocking visible light and ultraviolet rays. Mechanical properties: Tensile strength 4.5-4.8kg/mm, elongation 7%-10%, bending life ≥10,000 times (R5/180°).
Quality inspection standards Substrate inspection: thickness, roughness (AFM/ laser confocal microscope), purity analysis. Coating inspection: Uniformity of coating, adhesion, weather resistance (double 85 test for 500 hours without peeling). Adhesive testing: Peel strength, shear strength, heat resistance (thermal aging test). Environmental protection certification: RoHS and REACH standards, no halogen or harmful substance release.
5. Application scenarios and typical cases Consumer electronics: Electromagnetic shielding and grounding for mobile phones, computers and tablet computers, light-blocking decoration for display screens, and protection for high-frequency transmission lines. Industry and automotive: Electromagnetic shielding and high-temperature protection for transformers, air conditioning pipelines, and automotive electronic modules; Heat dissipation and grounding of battery packs for new energy vehicles. Medical and aviation: Static discharge for medical equipment, explosion-proof and electromagnetic shielding for aviation display Windows. Special scenarios: Explosion-proof layer for building glass curtain walls, protection for industrial control panels, dust-proof and moisture-proof for precision instruments.
