These machines are used to modify the surface energy of plastic materials, enhancing their adhesion for processes such as printing, painting, or gluing. Corona treatment utilizes high-voltage electrical discharges to create microporosities and introduce polar groups into the surface, improving adhesion. Flame treatment exposes the plastic surface to a controlled flame, slightly oxidizing it and altering its chemical properties to increase adhesion. Both methods are essential for industries that work with low-surface-energy plastics, such as polyethylene (PE) and polypropylene (PP), which naturally do not adhere well to paints and adhesives.