Flexible Packaging BOPP Surface Treatment Corona , Plasma , Flame

 

CORONA TREATMENT – Energy from highly charged electrical corona breaks the molecular bonds on the surface of a nonpolar substrate. The broken bonds recombine with free radicals to form additional polar groups on the surface – these have increased energy and improved wettability. The Corona treatment is obtained by creating an electric discharge – with high voltage and high frequency – in a limited air gap (1 or 2 mm), both linear and uniform, between an electrode charged to high voltage (via a power generator connected to a voltage booster transformer) and a counter-electrode coated with insulating material.

PLASMA TREATMENT – Similar to corona but gases are injected into the corona discharge. This can help lower the operating voltage and improve the treatment of extra-difficult surfaces. plasma is the so-called fourth state of matter. Almost any substance solidifies at low temperatures. By applying a certain amount of energy by heating it, it changes to the liquid state and by adding more energy it passes to the gaseous state. By adding energy to the gas, the molecules break down into atoms and electrons and reach the plasma state.

FLAME TREATMENT – Passing parts through the oxygen-rich portion of the flame helps break the molecular bonds on the surface of the material and excite the surface free radicals. This raises the surface energy and makes the surface more receptive to printing inks and adhesives. The flame treatment system for film production is composed by a mixture generator, with an integrated electric board and operator panel, for automation and control of equipment, then, the treatment station unit. The system, designed to work with all common industrial combustible gases, is equipped with automatic ignition and continuous detection of flame.