Compared with other commonly used processing equipment and methods, low-temperature plasma surface treatment machines under atmospheric pressure have many outstanding advantages, such as no pollution, convenient production, cost savings, online continuous production, and no impact on the material's intrinsic properties. Therefore, it has become one of the main research areas of material surface science and engineering.

The common atmospheric plasma surface treatment machine consists of a plasma generator, gas delivery pipeline, and plasma nozzle. According to the different nozzles, it is divided into direct injection plasma surface treatment machine and rotary plasma surface treatment machine. The principle is to use airflow to blow the plasma between the rod electrode and the cylindrical electrode out of the generator, thereby forming a plasma jet in the outer space of the nozzle. Low temperature plasma contains various active particles such as ions, excited molecules, and free radicals. The high-speed flow of these active particles exchanges energy with the material surface, resulting in surface modification of the material. Because it can separate the discharge area from the working area and directly deliver the active substance to the processing surface, plasma surface treatment machines can be used to process materials with complex surfaces.

The main differences between rotary spray and direct spray plasma surface treatment machines

Processing area

The direct spray plasma surface treatment machine has a small processing area, generally ranging from 2-10mm in diameter, and its processing efficiency is relatively low. If it is a large-scale material that needs to be processed, it is not suitable to use this type. The direct spray plasma surface treatment machine is suitable for processing points and lines, such as cables, slits, or a circle around the product that needs to be glued.

The rotary plasma surface treatment machine uses nozzle rotation to increase the processing area, with a processing area diameter generally between 30-80mm. The increase in processing area improves the shortcomings of direct spray nozzles and has a wider range of applications.

Jet length

Generally speaking, the jet length of a direct jet plasma surface treatment machine is longer than that of a rotary jet plasma jet, which means that direct jet plasma surface treatment machines have certain advantages when dealing with some gaps.

Left plasma surface treatment machine rotary spray type, right direct spray type

Processing power

With the increase of plasma processing power and high-energy particle energy, the particle flow density and the number of active groups also increase. Therefore, plasma treatment power is also an important parameter that affects the effectiveness of plasma treatment.

The power range of common direct jet plasma processing machines is 0-800W, and the power range of common rotary jet plasma surface processing machines is 0-1200W. Therefore, in terms of processing effect, rotary jet may be better than direct jet. Power is also an important factor affecting plasma treatment temperature, and the lower the power, the lower the treatment temperature will be.

The above is an introduction to the main differences between rotary jet and direct jet plasma surface treatment machines, mainly from three aspects: treatment area, jet length, and treatment power. In order to further expand the range of plasma surface treatment machines, automated equipment such as robotic arms, three-axis platforms, etc. can be used to achieve XYZ three-axis free movement of plasma spray guns, and cover difficult to process areas inside the material through nozzle adjustment.