What is corona treatment, and how is it applied to TPU film surfaces?

Corona treatment is an electrical surface modification process that increases the surface energy of materials, improving adhesion for subsequent coatings, printing, or laminating.

How corona treatment works on TPU films:

1. High-voltage discharge: A high-frequency, high-voltage power supply is applied between a metal electrode and the corona treatment roller, generating electrical discharge.
2. Air ionization and ozone formation: The discharge ionizes the surrounding air, producing ozone and energetic particles that interact with the TPU surface.
3. Surface activation: High-energy electrical sparks impact the TPU film, creating a micro-roughened, chemically active surface, which increases surface energy and improves adhesion.

Applying corona treatment to TPU films significantly enhances surface adhesion. It allows for stronger bonding when applying adhesives, coatings, or double-sided tapes, and improves durability and water resistance. It is important to apply coatings only on the corona-treated side of the TPU film for optimal adhesion and performance.

Overall, corona treatment is a reliable and widely used method to prepare TPU film surfaces for printing, laminating, and coating applications, ensuring better product quality and performance.