The vacuum processing technology of vacuum plasma processor is a technology that has been fully proven and widely used in etching and surface modification in the electronics industry. It is increasingly being used for cleaning and surface engineering of plastics, rubber and natural fibers in aviation, automotive, medical, packaging and other industries, as well as replacing chemical solvents (CFC) used for cleaning metal parts.


Vacuum plasma processor
　　The scope of application ranges from cleaning the entire surface engineering of small parts such as ballpoint pens, fabrics and film materials to the improvement of the adhesion of the entire automobile plastic body.
　　 There are only two real restrictions: can the product fit into the vacuum chamber and whether the vacuum chamber is suitable? If the product is too large or the product continuously generates moisture and gas under vacuum, it is not suitable for plastic processing.
Vacuum plasma treatment instrument Vacuum plasma can be used to clean the surface and remove organic residues, or to promote adhesion before painting, painting, printing, electroplating or bonding. The material can be modified and surface engineering treatment to change the surface performance without Affect raw materials. Surface engineering can improve friction characteristics, lubrication properties, heat resistance, and film bonding strength. Properties such as surface conductivity or dielectric constant, or can make the material hydrophilic or hydrophobic.
　　 For good adhesion, the entire surface and compatible surface cleaning is very important, but it is often difficult to achieve. After mechanical cleaning or surface preparation, sticky and loose particles are often left on the surface. Aqueous cleaning will result in insoluble local lumpy residues, and they will be deposited on the entire surface in the form of a thin film later when they are evaporated.
　　 This thin film is difficult to remove except for plasma or other radioactive treatments. Vacuum plasma cleaning can remove all residues and "automatically clean" the surface. The use of reactive gas can enhance adhesion.
"Chemical substances and free radicals generated by these gases, which react with the surface or deposit on the surface, through the formation of chemical bonding or electrical connection to improve the affinity to the adhesion surface. The non-reactive inert gas plasma carries heavy ions, which will change the topography of the surface and thus improve the mechanical bonding.
　　 They can also produce surface groups by mechanically destroying the atomic structure. These surface groups can participate in surface reactions and bonding in the future.
　　 Vacuum plasma treatment instrument Vacuum plasma treatment is a low temperature process, generally 40~120C, so it can avoid thermal damage. This process can produce an athermal surface activation reaction, which does not occur with the chemical composition of molecules under atmospheric pressure. These unique properties can open up new possibilities for materials and products.
　　Plasma treatment is carried out under controlled environmental conditions in a sealed chamber. The sealed chamber is maintained at a moderate vacuum by introducing a selected gas, usually 13~65Nm2. The gas or gas mixture uses an electric field to generate a frequency of 1~5000W generally at 500V. The parts to be processed are usually insulated. The volatilized plasma by-products are removed from the room by the vacuum pump of a vacuum plasma processor, and can be neutralized (inhibited) by an exhaust gas exhauster if necessary.
　　 Unlike liquid road cleaners and diffusers that only use molecular chemistry, plasma uses electrons and positive ions that are atoms, free radiation and metastable substances for chemical action, as well as electrons and positive ions for dynamic action. Plasma can also generate electromagnetic radiation in the form of ultraviolet rays, which can penetrate polymers to a depth of about 10 μm, which can cause chain scission and cross-linking.
　　Because the plasma acts on the material at the atomic level, surface analysis techniques such as scanning electron microscope and X-ray photoelectric spectrometer are often used to identify the required method and judge its effect. However, it is often enough to use the water drop contact angle test method to simply show the surface energy and thus show the adhesion and wettability. The smaller the contact angle, the higher the surface energy and the greater the hydrophilicity of the material.
　　Vacuum plasma treatment device can be designed according to product and treatment method. Parts can be installed in trays or baskets, or loaded into drums. Rolls or films can be processed roll-to-roll. The design of the electrode depends on the product and the processing process. In the case of a flat surface to be processed, parallel plate electrodes with unidirectional plasma can be used.
　　Vacuum plasma treatment method can avoid damage to the material, because this method is a controllable low-energy density low-temperature process. Plasma energy is highly efficient, because vacuum pressure can reduce recombination and increase the free stroke length of particles, thereby generating higher ion kinetic energy. In a controllable vacuum plasma environment. Through careful selection of plasma gas and process parameters, precise surface engineering effects can be obtained. Different gases can be used in sequence to obtain different effects.
　　Vacuum plasma treatment instrument has many uses and various kinds of polypropylene automobile parts such as car baffles, door frames and instrument panels are plasma treated before painting, just as ABS parts are plasma treated before the wood grain effect is converted. Polytetrafluoroethylene can be treated with plasma to obtain wettability and grip strength, so that dangerous liquid chemicals can be avoided. Plasma treatment of polyethylene molded parts proved to be successfully used for adhesion of water-based epoxy adhesives, solvent-based adhesives and electroless copper plating.
　　 This method has replaced the chromic acid method for health and environmental reasons. Textile wool and nylon materials have been successfully pasted on natural rubber sheets in batches to form composite materials for waterproofing. Many continuous resin film materials have been plasma treated in rolls, which has improved the adhesion, surface wettability of ordinary inkjet printing and the affinity of blood products.
　　Vacuum plasma treatment instrument plasma technology has many advantages. It can obtain thermodynamic reversible reaction at low temperature, and the surface can be cleaned without leaving residue; it can enhance adhesion without coating and pretreatment. The mechanical, electrical and chemical properties of the material can be changed, and the computer control of all variables during the processing can ensure quality and reproducibility.