The application advantages of PI silver plated film in electromagnetic shielding materials

1. Introduction

Electromagnetic interference has a serious impact on precision instruments, which can cause data signal errors, device failures, and even endanger personnel safety. With the continuous development of electronic devices towards miniaturization and high frequency, this issue has become increasingly prominent. So, electromagnetic shielding technology emerged, which relies on excellent shielding effectiveness to prevent excessive interference of electromagnetic waves, thereby ensuring the normal operation of equipment.PI silver plated filmIt is a new type developed by Advanced Institute (Shenzhen) Technology Co., Ltdelectromagnetic shielding materialThrough unique silver plating technology, a silver film is formed on the surface of polyimide (PI), providing excellent electromagnetic shielding effect.

2. Advantages of PI silver plated film

2.1 Excellent shielding effect

according toAdvanced Institute (Shenzhen) Technology Co., LtdAccording to experimental data, the shielding efficiency of PI silver plated film can reach 80-100dB in a wide frequency range from 300kHz to 10GHz. This is because silver has the highest electrical conductivity among all metals. Physically speaking, when electromagnetic waves propagate to the surface of PI silver plating film, the free electrons in the silver film will undergo directional motion under the action of electromagnetic wave electric field, thereby forming induced current. This induced current will generate a secondary electric field opposite to the direction of the incident electromagnetic wave electric field. According to the law of electromagnetic induction, these two electric fields overlap with each other, causing a large amount of energy from the incident electromagnetic wave to be reflected back, effectively reducing electromagnetic interference and achieving high shielding efficiency.

2.2 Excellent heat resistance and chemical corrosion resistance

PI, as a substrate, has very high heat resistance. Experiments have shown that the shielding effectiveness of PI silver plated film only decreases by 5% at 150 ℃; At 200 ℃, the shielding effectiveness decreases by about 10%; When the temperature reaches 250 ℃ (which is its long-term use temperature), the shielding effectiveness decreases by about 15%, but it can still maintain a good shielding effect. This superior heat resistance enables it to effectively provide electromagnetic shielding even in high temperature environments.

Meanwhile, PI has excellent chemical corrosion resistance, which can resist most organic solvents such as acetone and ethanol, as well as strong acids such as sulfuric acid and hydrochloric acid, and strong bases such as sodium hydroxide. For example, willPI silver plated filmAfter soaking in a 30% sulfuric acid solution for 24 hours, there were no obvious corrosion marks on its surface, and the shielding effectiveness only decreased by about 3%, which fully reflects the importance of its chemical corrosion resistance in maintaining electromagnetic shielding performance.

2.3 Good mechanical processing performance and flexibility

The PI silver plated film exhibits excellent mechanical processing performance. When cutting at a speed of 10mm/s, the edge neatness of the material can reach over 90%, and the shielding effectiveness of the cut material remains basically unchanged; During the winding process, after 10 rounds of winding, the flexibility of the material did not significantly decrease, and the shielding effectiveness only decreased by about 5%; When the pressing pressure is 5MPa during the pressing process, the adhesion of the material can reach over 95%, and the shielding effectiveness of the pressed material is slightly improved by about 3%.

Its good flexibility allows the material to bend into various shapes. For example, when providing electromagnetic protection for a precision instrument with complex surfaces, the PI silver plated film can easily bend and adhere to the surface of the instrument without cracking or significantly reducing shielding effectiveness.

3. Meet the electromagnetic protection requirements of precision instruments

3.1 Customizing Dimensions

Through laser cutting, computer numerical control machining and other methods, it is possible toPI silver plated filmCustomize according to the specifications and shapes of precision instruments to ensure a tight fit between electromagnetic shielding materials and equipment. If size customization is not carried out, the PI silver plated film may not be able to fully cover key parts of precision instruments, resulting in electromagnetic leakage. For example, for some precision instruments with complex internal structures and irregular shapes, using shielding materials that have not been customized in size may result in electromagnetic leakage at corners, gaps, and other parts of the instrument, which may affect the normal operation of the instrument and even cause damage to electronic components inside the instrument due to electromagnetic interference.

3.2 Design a reasonable electromagnetic shielding scheme

Identify key sensitive areas in the equipment and design appropriate protective measures to maximize the electromagnetic shielding effect of PI silver plated film. If a reasonable plan is not designed, it may lead to insufficient protection of key areas, making them vulnerable to electromagnetic interference. For example, in a precision instrument containing multiple high-frequency circuit modules, if there is no specialized protection scheme designed for these high-frequency modules, the electromagnetic radiation generated by these modules may interfere with the normal operation of other modules and be easily affected by external electromagnetic interference, thereby reducing the performance and reliability of the entire instrument.

3.3 Optimizing Material Layer Structure

For complex environments or electromagnetic protection equipment with extremely high requirements, multi-layer PI silver plated films can be stacked to achieve better protection effects than single-layer ones. If the material layer structure is not optimized, a single-layer PI silver plated film may not provide sufficient shielding effectiveness when facing complex electromagnetic environments or precision instruments with extremely high electromagnetic protection requirements, thus failing to meet the electromagnetic protection needs of the instruments.

in general,PI silver plated filmWith its excellent shielding effect, outstanding heat resistance and chemical corrosion resistance, as well as good mechanical processing performance and flexibility, it has become an ideal electromagnetic shielding material. Its various advantages lay a good foundation for meeting the electromagnetic protection needs of precision instruments, such as its flexibility to better fit the shape of the instrument when customizing dimensions, heat resistance and chemical corrosion resistance to adapt to various working environments, and good mechanical processing performance to facilitate various processing to meet the structural requirements of different instruments. Through flexible and effective protection schemes, it can meet the electromagnetic protection needs of various precision instruments and ensure their normal operation.
The above data is for reference only, and specific performance may vary due to production processes and product specifications.