There are many fast and simple testing methods to determine how effective the plasma cleaning machine is on the surface after treatment!

Why are adhesion and surface energy so important when using plasma treatment equipment?

Firstly, surface energy is defined as the excess energy on the surface of a material compared to the bulk material itself. Now let's consider what happens when a liquid comes into contact with the surface. If the strength of mutual attraction between liquid molecules is greater than that on the surface, the liquid will not wet the surface well, but instead form beads. On the contrary, if there is a greater attraction to the surface, the liquid will diffuse more. Therefore, if a specific surface has higher surface energy, it will be easier to wet, and due to the ability to wet the surface, which in turn is a simple definition of surface adhesion properties, it will be easier to bond/print/paint/inkjet process.

The impact of plasma cleaning technology on adhesion and surface energy varies, with specific differences as follows:

1. Working principle:

In terms of adhesion, plasma cleaning technology mainly removes surface pollutants, facilitating close contact between adhesive molecules and the adhered molecules, and increasing intermolecular forces. At the same time, plasma cleaning technology can increase surface roughness through bombardment, form micro concave convex structures, and further enhance the adhesion between products, thereby improving adhesion.

For improving surface energy, active particles in the plasma undergo chemical reactions with the material surface, introducing polar groups such as hydroxyl and carboxyl groups, which change the surface from non-polar or weakly polar to polar and increase surface energy. In addition, the removal of low surface energy substances during the cleaning process also increases the surface energy of the material.

2. Effect:

In terms of adhesion, plasma cleaning technology can significantly enhance the adhesion effect between different materials, improve the reliability and durability of bonding. For example, in chip packaging, it can effectively prevent problems such as delamination and delamination between the chip and packaging materials, improving the packaging quality and service life of the product.

In terms of surface energy, plasma cleaning technology can increase the surface energy of materials, improve the wettability of liquids on solid surfaces, and enable liquids to spread better on solid surfaces. For example, after plasma cleaning, the surface energy of products such as silicone rubber will be significantly improved, and the adhesion and printing quality of ink on its surface will be further improved.

3. Testing method:

How to detect adhesion: Usually, methods such as droplet angle are used for detection. By using the waterdrop angle dyn pen test, the effect of plasma cleaning machine on material surface treatment can be quickly and easily evaluated. If the dyn value obtained from the test is high, it indicates that the plasma cleaning machine effectively improves the surface energy of the material, improves the wetting and adhesion properties of the surface, and is beneficial for subsequent bonding, coating, printing and other processes. Especially in the automotive industry, if automotive components undergo plasma cleaning before packaging and obtain high dyne values through dyne pen testing, the encapsulation adhesive can better spread and adhere on the surface during encapsulation, improving the reliability of the packaging.

For surface energy, it is generally detected by a contact angle measuring instrument. Measure the contact angle of liquid on the material surface and calculate the surface energy based on the size of the contact angle. The smaller the contact angle, the higher the surface energy and the better the wettability of the liquid on the surface. For example, in the glass coating process, the contact angle of water droplets on the glass surface is measured to determine the change in glass surface energy after atmospheric or vacuum plasma cleaning, and thus determine the adhesion effect of the coating.