Ultrasonic Spray Coating of PET Film

Ultrasonic Spray Coating of PET Film – Cheersonic Coating

Coated polyester film, also known as coated PET film, is a functional plastic film made by coating one or both sides of a PET substrate with a specific material. The PET substrate is formed by the condensation polymerization of refined terephthalic acid and ethylene glycol, possessing inherent properties such as high transparency, excellent toughness, and superior temperature and chemical resistance. The type, number of layers, and coating process directly determine its comprehensive physical, mechanical, optical, thermal, electrical, and chemical properties. Furthermore, combinations of coating and surface treatments can be used to meet customized needs in various scenarios.

Ultrasonic spray coating is currently the core precision technology for preparing coated PET films. Compared to traditional spraying, it utilizes high-frequency sound waves to atomize the coating material into micron-sized uniform droplets, which are then deposited onto the surface of the flexible PET substrate in a non-contact manner, perfectly adapting to the easily deformable nature of PET film. This process involves extremely low atomization pressure, preventing stretching or damage to the substrate. The narrow droplet size distribution allows for precise control of coating thickness from nanometer to micrometer levels, with thickness deviations controlled within ±5%, effectively avoiding defects such as streaks and pinholes found in traditional processes. Meanwhile, its material utilization rate exceeds 80%, far higher than the 30%-50% of traditional spraying, making it particularly suitable for the efficient utilization of high-end coating materials such as graphene and nano-ceramics.

The choice of coating type is key to customizing the properties of PET film; different coatings optimize different performance dimensions. Among wear-resistant coatings, silicone-based coatings can increase the surface hardness of PET from 2H to 4H-5H, suitable for ordinary optical protective films; nano-ceramic coatings can achieve a hardness of over 6H, used in high-end industrial instrument panels. Antistatic coatings are divided into surface coatings and internal additions. Surface coatings with conductive polymers, silver nanowires, etc., can reduce surface resistance to 10⁸-10¹¹Ω without affecting light transmittance, suitable for electronic component packaging. Optical coatings can optimize light transmittance and haze, increasing the light transmittance of PET film to over 94%, meeting the ultra-transparency requirements of photovoltaics, camera lenses, and other scenarios.

The number and combination of coatings further expand the application boundaries of PET film. Single-layer coatings can be optimized for specific properties, such as oil-resistant coatings in the packaging industry and insulating coatings in the electronics industry. Multi-layer composite coatings, on the other hand, can achieve synergistic performance, such as flexible screen protective films using a “PU abrasion-resistant coating + conductive antistatic coating,” balancing flexibility and antistatic properties. Depending on application requirements, the combination of coatings and surface treatments is more flexible. For example, one side can be coated with a nano-ceramic abrasion-resistant coating, while the other side undergoes plasma cleaning to improve adhesion, suitable for automotive central control screens; or one side can be coated with an optical anti-reflective coating, while the other side undergoes scratch-resistant treatment, for use in optical instrument panels.

Ultrasonic spray-coated PET film, with its excellent customizability, is widely used in electronics, optics, packaging, new energy, and other fields. In the electronics industry, it serves as an IC packaging film and LCD backlight film, combining antistatic and abrasion resistance; in the optics field, it can be used as a camera lens protective film, meeting high transparency and low haze requirements; in the packaging industry, it is used for high-end food and electronic component packaging, meeting the requirements for antistatic and chemical corrosion resistance; in the new energy field, it serves as a lithium battery separator support film, achieving high temperature resistance and high insulation properties through coating optimization.

With the upgrading of industry demands and the continuous iteration of ultrasonic spraying technology, coated PET films are developing towards multi-functional integration and green environmental protection. By precisely matching coating materials and spraying processes, multiple properties such as antistatic, anti-fingerprint, and biodegradability can be achieved, further expanding its application scenarios and making it an indispensable functional material in high-end manufacturing fields.

About Cheersonic

Cheersonic is the leading developer and manufacturer of ultrasonic coating systems for applying precise, thin film coatings to protect, strengthen or smooth surfaces on parts and components for the microelectronics/electronics, alternative energy, medical and industrial markets, including specialized glass applications in construction and automotive.

Our coating solutions are environmentally-friendly, efficient and highly reliable, and enable dramatic reductions in overspray, savings in raw material, water and energy usage and provide improved process repeatability, transfer efficiency, high uniformity and reduced emissions.

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