After using online vacuum plasma cleaning technology for surface activation modification, the material surface has significantly better wetting ability.

Each material surface has specific surface energy, and each liquid (such as ink) also has inherent tension. Reliable adhesion with long-term stability in printing, bonding, or coating requires that the surface energy of the material be greater than that of the liquid. For example, plastics mainly have low surface energy (usually less than 28mN/m). If these plastics are to be printed, the surface energy of solvent ink needs to be 40mN/m, and the surface energy of ultraviolet curing system needs to be 56mN/m. If a water-based coating system is used, the surface energy must be higher than 72 mN/m.

For many industrial applications, vacuum plasma cleaning technology plays a crucial role in improving ink adhesion. Targeted pretreatment with atmospheric pressure plasma can significantly increase surface tension, which endows materials with the best ability to accept ink (wettability) or adhesion.

Common silicone rubber products such as PTFE (polytetrafluoroethylene or silicone rubber) require plasma cleaning technology to improve surface adhesion. High energy particles (ions, free radicals, etc.) in the plasma can bombard the material surface, breaking inert molecular chains (such as C-F bonds) and introducing polar groups such as hydroxyl (- OH), carboxyl (- COOH), carbonyl (C=O), etc., increasing surface energy to above 40-50 mN/m and significantly enhancing wettability.

The vacuum plasma cleaning machine can improve the adhesion between silicone rubber and metal/plastic (such as sealing ring adhesion), coating (such as anti sticking coating) adhesion, ink printing, etc.

Comparison of surface energy before and after plasma treatment: Before plasma treatment: low surface energy, high contact angle (a>90 °) of about 20mN/m, after plasma treatment: higher surface energy, lower contact angle (a<20 °) of about 60mN/m

What are the characteristics and advantages of an online vacuum plasma cleaning machine

1. Fully automatic operation: PLC+touch screen control, easy to operate, all-round plasma processing, no need to manually load/unload batch electrode trays.

2. Multi functional operation: The system can be used independently or placed in parallel with upstream or downstream operation processes;

3. Ultra low temperature: System operating temperature as low as 40 ° C;

4. Environmental protection: does not use any chemicals and does not produce harmful substances;

5. Cleaning: Remove fine dust, oil, grease, and organic compounds;

6. Activation: Increasing surface energy to promote wetting and adhesion;

Zhenyi Co., Ltd. is a manufacturer of vacuum plasma cleaning machines with different chamber capacities to choose from: 5L, 10L, 30L, 60L, 125L, 250L. Depending on the chamber capacity and material, power supplies and powers of 40kHz and 13.56MHz can be selected, or customized according to customer needs.