Corona treatment and single-layer coating
Corona treatment is a type of surface coating technology used to modify and coat the surfaces of materials. It is a form of electrical discharging by a device known as a corona that sends an electrical charge to the material. The resulting plasma that develops creates a strong electrostatic field which can attach a variety of different materials to the surface of the material being treated.
The purpose of corona treatment is to increase surface wettability, adhesion, and the overall surface energy of the material treated. This improved surface energy helps promote better adhesion of inks and other materials, such as coatings, dyes, and adhesives. It is often used in the printing and packaging industries, as well as in automotive, medical device, and electrical applications. A corona discharge causes molecules on the material surface to become less tightly bound to each other and form a more electrically conductive surface. This in turn increases the polar contribution to the surface energies and allows for better adhesion without altering other surface properties.
In addition, corona treatment can be used in conjunction with single-layer coating. This coating technique is used to apply a thin but effective post-processing coating on the material surface. This coating helps improve the bonding of subsequent applications such as inks, adhesives and coatings. This single layer coating is applied by a vacuum sputter. The design of the vacuum sputter is such that the material to be coated is exposed to an enclosed chamber filled with a process gas. The process gas is then energized and directed towards the substrate causing the coating material to be deposited on the substrate in a single layer providing improved adhesion of subsequent coatings. This process is also very cost-effective in comparison to other conventional coating techniques.
The advantages of using single-layer coating in conjunction with corona treatment is that it provides improved adhesion of the coating material and helps create a scratch-resistant, hydrophobic surface. It is also applicable to a variety of different substrates, from paper to plastic and metal and is highly customizable to suit the specific needs of the application. This process can be also used to create a low surface energy enabling it to be used for water- or oil-resistant or nonwetting applications.
In conclusion, corona treatment and single-layer coating have become very popular surface coating technologies due to their advantages in terms of cost, efficiency and customization. They offer a high degree of control over the substrate by providing improved adhesion and surface energy, allowing for a wide range of applications. Although their use and advantages may vary depending on the requirements of the specific application, they remain a reliable and cost-effective method for surface coating.
