Under the dual drive of miniaturization of electronic devices and lightweight packaging, the thickness of functional films is constantly being compressed.
PET aluminum plated filmAs a composite material that combines a polymer substrate with a metal functional layer, its total thickness is mainly composed of two parts: the thickness of the PET substrate and the thickness of the aluminum plating layer.
When the thickness of PET substrate decreases6 micronsAt that time, the material entered a special engineering zone - at this scale, the flexibility of the substrate, the adhesion of the coating, and the synergistic performance of the two all face new balance requirements.

2、 Vacuum aluminum plating process: how to make 6 μ m PET "grow" a metal layer

The core manufacturing process of PET aluminum coated film isVacuum deposition——Heat high-purity aluminum to the evaporation temperature (approximately 1200-1400 ° C) in a high vacuum environment ranging from 10 ⁻² to 10 ⁻⁴ Pa, causing aluminum vapor to condense and deposit on the surface of the high-speed PET film, forming a continuous and dense layer of metallic aluminum. The key to this physical vapor deposition (PVD) process is:

3、 Core properties of 6 μ m PET aluminum coated film

When 6 μ m PET substrate is combined with nanoscale aluminum layer, the material obtains the following key properties:

• Conductivity and anti-static propertiesThe aluminum layer makes the PET surface conductive and effectively dissipates static electricity accumulation. The surface resistivity significantly decreases after aluminum plating.
• electromagnetic shieldingThe aluminum layer has a reflection and attenuation effect on electromagnetic waves and can be used as a lightweight EMI shielding layer.
• Light reflection and obstructionVisible light reflectivity can reach over 92% -95%, with good blocking ability for ultraviolet and infrared rays, effectively blocking oxygen and water vapor.
• heat resistanceThe long-term use temperature of PET substrate can reach around 120 ° C, and the aluminum layer further enhances the material's heat reflection ability.

4、 Why choose 6 μ m: the core logic of engineering selection

⚠️ Selection personnel should note that the mechanical strength of 6 μ m substrate is lower than that of thick film, and higher precision and control requirements are required for subsequent processing techniques (composite, printing, die-cutting).

5、 Product series: 6 1PET · 6 0.12PET · 6 0.5PET · 6 0.8PET aluminum plated film

Based on a 6 μ m PET substrate, aluminum plated film products with different aluminum layer thicknesses can be prepared by adjusting the aluminum plating process parameters. Different thicknesses of aluminum layers correspond to different performance priorities, and engineers can choose according to specific application requirements:

Note: Optical Density is a commonly used indicator to measure the thickness of aluminum layers in aluminum plated films. The higher the OD value, the thicker the aluminum layer, and the higher the barrier and reflectivity.

6、 Typical application scenarios

VII. Conclusion

The 6 μ m PET aluminum plated film represents an important direction for the development of functional films towards ultimate lightweight and thinness. It is not simply 'thinner', but rebalances the relationship between mechanical performance, optical performance, barrier performance, and conductivity on a thinner scale. For engineers, understanding the process constraints and performance opportunities brought by 6 μ m substrates is the key to correct selection and successful application.