Why Need Corona Treatment On The Foam Surface?

- Aug 16, 2019-

What is corona treatment?

Corona treatment is a kind of electric shock treatment on the surface, which makes the surface of the substrate have higher adhesion,  it sometimes referred to as air plasma, and is a surface modification technique that uses a low-temperature corona discharge plasma to impart changes in the properties of a surface. The corona plasma is generated by the application of high voltage to an electrode that has a sharp tip.

corona treatment


What is corona treatment theory?

The principle is to use high frequency and high voltage in the treatment of the plastic surface corona discharge (high-frequency ac voltage up to 5000-15000V/m2), and produce low-temperature plasma so that the plastic surface produces a free radical reaction and polymer cross-linking. The roughness of the surface and increase its wettability to polar solvents - these ionized bodies are shocked and infiltrated into the surface of the printed material to destroy its molecular structure, which in turn oxidizes and polishes the treated surface molecules, and ion shock erodes the surface to increase the adhesion ability of the substrate surface.


How to test the effect of corona treatment?

Tool: Dyne pen

dyne pen

How to use dyne pen?

A quick and easy way of measuring surface wetting or surface energy.

When the Dyne level test pen is applied to the surface, the liquid will either form a continuous film on the surface or pull back into small droplets.

If the Dyne test fluid remains as a film for 3 seconds, the substrate will have a minimum surface energy of that ink value, expressed in mN/m (Dynes).


What is dyne pen?

When the Dyne level test pen is applied to the surface, the liquid will either form a continuous film on the surface or pull back into small droplets.

If the Dyne test fluid remains as a film for 3 seconds, the substrate will have a minimum surface energy of that ink value, expressed in mN/m (Dynes).