Could you introduce the structure and core characteristics of transparent PET release film?
Transparent PET release film is a functional film made from polyethylene terephthalate (PET) as the substrate, treated with a release agent (such as silicone oil) on the surface. It features good transparency, strong temperature resistance, and stable release force, and is widely used in electronics, packaging, composite materials, and other fields. The performance of transparent PET release film is determined by both the substrate and the release layer, with the core structure and characteristics as follows:
Release film
Core structure:
Base material layer: PET film (typically 25-150μm thick), which possesses excellent mechanical strength (resistance to stretching and tearing), temperature resistance (short-term temperature resistance of 150-200℃, long-term temperature resistance above 120℃), and chemical stability (resistance to acids and alkalis, and organic solvents). Additionally, it has high transparency (light transmittance ≥90%), ensuring that the base material itself does not affect the visibility of the protected object.
Release layer: A silicone oil (or fluorine-based release agent) is coated on the surface of the substrate to form a low surface energy coating, which provides a controllable peel force (release force) between the film and the adherend (such as adhesive tape or adhesive), achieving the effect of "easy peeling and no residue".
Core Features:
Transparency: High light transmittance, suitable for scenarios where the surface of the protected object needs to be observed (such as electronic screens, optical films);
Adjustable release force: By adjusting the amount of release agent applied, low release force (1-10g/in), medium release force (10-50g/in), and high release force (50-100g/in) can be achieved, meeting different peeling needs;
Weather resistance: Resistant to UV aging, with good stability of release force in humid and high-temperature environments (less prone to adhesive force decay or residue);
Flatness: The PET substrate, processed through a biaxial stretching technique, boasts high film flatness (free from wrinkles and warping), making it ideal for precision lamination applications.