Customers often ask about the difference between corona and plasma treatment. First, let's understand the concept of corona treatment.

Curing by Corona Treatment

Corona treatment is an electrical discharge process that enhances the adhesion of the substrate surface. It involves the use of high-frequency, high-voltage corona discharge on the treated plastic surface, with alternating voltages reaching up to 5,000 to 15,000 volts/square centimeter. This generates a low-temperature plasma, causing free radical reactions on the plastic surface, leading to cross-linking of polymers, roughening the surface, and improving its wettability with polar solvents. These ions penetrate and enter the substrate surface through electrical discharge, disrupting its molecular structure, oxidizing and polarizing the treated surface molecules, and eroding the surface through ion discharge, thereby increasing the adhesion capacity of the substrate surface.

We can see that within the concept of corona treatment, there's a phrase that states, through high-frequency discharges, plasma is produced. In fact, corona is a type of plasma; it's just that the plasma is generated through corona discharge.

Corona discharge is just one method of plasma generation; both are essentially the same thing. The reason one is called "corona" and the other "plasma" is due to the method of plasma generation.

Low-temperature plasma is typically obtained through gas discharge. Depending on the type of discharge, low-temperature plasma can be categorized into the following types: glow discharge, corona discharge, dielectric barrier discharge, and atmospheric pressure glow discharge.

So, a corona discharge is a plasma. Then, why are there different devices like corona machines and plasma treatment units on the market? It's because they have distinct application ranges and treatment effects. Let's take a look at the differences between corona machines and plasma treatment units next.

The Commonalities Between Plasma Treaters and Corona Treaters:

One: Plasma treatment machines and corona treatment machines both utilize high-frequency high-voltage discharge to produce low-temperature plasma for modifying the surface of raw materials.

Both can improve the adhesion of the raw material surface, benefiting the adhesion, painting, and printing techniques of the raw material.

All are online production and processing, manufacturing.

Plasma Treatment vs. Corona Treatment: Surface Processing Differences

One, in addition to glow discharge in plasma surface treatment, it also involves electrostatic charging and discharging, which generates a large amount of kinetic energy, achieving adhesion strengths of up to fifty degrees or even higher, whereas corona machines typically reach only about thirty degrees of adhesion.

The corona discharge effect has a wide coverage, making it suitable for products with lower adhesion requirements, such as fabrics, plastic films, and plastics. Therefore, the corona machines we see typically have a broad range that a single discharge electrode can handle, whereas the area for plasma surface treatment is relatively narrow. Consequently, for materials like films, corona machines are generally chosen for the treatment. You might wonder if it's possible to use a plasma treatment machine for films. The answer is actually yes, but it's not the most suitable option.

In summary, corona treatment and plasma treatment are essentially the same, both utilizing low-temperature plasma to activate and modify the surface of materials; the differences lie in their applications and effects.