The difference between plasma and corona treatment

Prepress machine

The difference between plasma and corona
Plasma and corona treatment methods are different. Corona can only treat very thin things, such as plastic films. The volume of the treated object must not be large and it is used for wide-area treatment.

The principle is to use high-frequency and high-voltage corona discharge on the surface of the plastic being processed (high-frequency AC voltage as high as 5000-15000V/m2) to generate low-temperature plasma, which causes free radical reactions on the plastic surface to cause cross-linking of the polymer. ． The surface becomes rough and

Increase its wettability to polar solvents – these ions penetrate into the surface of the object to be printed by electric shock and destroy its molecular structure, thereby oxidizing and polarizing the molecules on the surface to be treated. The ion electric shock erodes the surface, resulting in an increase in the number of substrates to be printed. Surface adhesion ability.
The similarities between plasma surface treatment machine and corona machine surface treatment:

1. Plasma surface treatment and corona machine surface treatment are both high-frequency and high-voltage glow discharge, which use plasma to treat the material surface.
2. The role of plasma surface treatment and corona machine surface treatment: both can improve the adhesion of the material surface, which is beneficial to bonding, spraying and printing processes.
3. All are processed online and produced in assembly lines.
   The differences between plasma surface treatment and corona machine surface treatment:
4. In addition to glow discharge, plasma surface treatment also includes electrovoltaic discharge, which generates stronger energy and can achieve an adhesion of more than 52 dynes, while corona machines generally can only achieve an adhesion of 32-36 dynes.
5. The corona machine can handle materials with wide width and low adhesion requirements, such as cloth, film, plastic film and the like. In plasma surface treatment, the width of a single nozzle is generally only 50mm, and a combination of multiple nozzles is required to achieve wide-width processing. The cost will be higher when processing wide format, but the processing effect is good.