Corona discharge is a controlled electrical plasma used across industry to change surface properties — not by heat, but by chemistry at the surface ⚡ When a high voltage ionizes air near a material, ions and radicals strike its surface, breaking molecular bonds and adding oxygen-based groups. This raises surface energy so coatings, inks, or adhesives bond better — without changing the bulk. ⸻ 🔬 Common uses • Boost adhesion on films and polymers (PE, PP, PET, PVC, foils). • Improve wettability so liquids spread evenly. • Clean or oxidize surfaces before coating or printing. • Treat in-line during film extrusion or converting. ⸻ ⚠️ Key points • The effect fades with time, so apply coatings soon after treatment. • Over-treatment can roughen or degrade surfaces. • Ozone is a byproduct, so ventilation and destruct units are standard. • Flat, non-conductive materials treat most efficiently. ⸻ Industries rely on corona discharge for packaging, automotive parts, electronics, an...