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Plasma surface processor printing, bonding, welding pre - treatment process
Plasma surface treatment can improve the surface adhesion of various materials, so that all kinds of materials in printing, spraying, bonding, welding and other processes, glue, ink, solder joints, coating, etc., effectively adhere to the surface of the material, to ensure the firmness. About printing, pad printing, screen printing, printing, thermal transfer, lettering, printing process, such as in the process, plasma surface treatment has obvious effect, before printing, first for plasma surface treatment, in order to improve the material surface adhesion and hydrophilic, make the printing after printing satisfy clients' demand for all kinds of inspection, the inspection requirements, either with a specific type of 3 m tape, have a plenty of judged by printing fastness printing whether accord with the requirement of the customer, have a plenty of friction with his nails to test; Some use a hundred squares to detect; Some use special cotton fabrics for friction testing; No matter which test method is used, the purpose is to test the firmness of printing and whether it meets the customer's requirements. Spraying aspects, involving stainless steel spraying, plastic spraying, etc., these processes are generally used in stainless steel thermos cup, auto parts, the need for pre-treatment of products, the particularity of product use reflected in the product use environment and frequency. If some parts on the car, PP + GF is generally selected materials, the characteristics of the material surface adhesion stress is low, heat resistant, wear resistant, good toughness, but the material itself but the corrosion resistance is not high, so in the subsequent process need to spray coating corrosion resistant layer on the surface of a material, because of material itself bond low, surface treatment by plasma surface treatment machine, spray on subsequent strong degree, can effectively guarantee; Such as stainless steel insulation cup, before spraying, the need for multiple pickling process, to ensure that the surface of stainless steel pollutants are effectively cleaned, the use of plasma surface treatment equipment, can replace the pickling process before spraying. In terms of bonding, it is mainly reflected in the box paste machine, PP+ wood pulp and cotton bonding, LED lamp waterproof glue bonding before, car horn and buzzer bonding before, etc. Materials in these bonding processes all have a characteristic: the surface bonding strength is low, glue is difficult to bond effectively. Such as film coated cartons, UV coated cartons, the surface adhesion is low, before the general adhesion, with a grinding machine before the grinding, such as LED lamp waterproof glue before coating, are generally used to wash water and other chemicals to clean the surface before adhesive, and then coated with adhesive. Such as car parts, generally before the glue, the surface with polypropylene water, and then the glue. And with plasma cleaning equipment, can completely replace grinding machine, instead of washing water, replace PP water, in line with the national environmental protection requirements, pollution-free belongs to dry cleaning. Welding, are generally new energy battery - lithium battery, battery, pole ear soft packages, nickel surface plasma cleaned before welding, PCB micro welding surface, the bonding chips, substrate or substrates using a suitable cleaning process is very important, in the traditional solvent after cleaning, add a dry ion cleaning process, can be more effectively remove residue and oxides. The plasma cleaning technology can be used for the cleaning of all kinds of PCB through holes, pads, substrates and optical glass touch screens, including printing, bonding, spraying, inkjet, surface activation before electroplating, cleaning, coating, coating, modification, grafting, roughening, etc.
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Plastic plasma surface treatment
Plastic is a solid substance based on organic macromolecules, which can be synthesized artificially or modified by natural products. It can be divided into thermoplastic materials (fusible, castable, and mouldable) and thermosetting materials (castable only in monomer state, polymerizable), which are then cured. In the pure state, plastic is a good insulating material with densities between 0.9g/cm3 and 1.5g/cm3 (except in the foamy state). Generally speaking, it is combustible. Plastic has lower hardness, stiffness and strength than metal building materials. Different copolymers may have rubber elastic properties. Plastics can also be made harder than steel by various modifications, such as adjusting their electrical conductivity, through additives and fillers or by plasma surface processors. Typical defects on plastic surfaces: Adhesives, paints, printing inks and other adhesion performance is poor, low hardness, poor wear resistance; The following characteristics can be improved or completely changed by plasma treatment: the wettability and adhesion of coating can be obviously improved by plasma surface treatment for plasma activation and etching. Most plastics have very little surface tension. Its surface tension is generally lower than that of most liquids, which are the building blocks of binders, paints, and paints. As a result, the coating is less wettability and therefore less adhesion because most plastics have non-polar properties. The oxygen plasma surface treatment has a significant effect on the increase of surface tension of non-polar plastics, which forms polar bridge bonds due to the high activity of oxygen free radicals in the coated liquid. This increases the surface tension and wettability of the plastic, which increases the surface area of the plastic as it is etched, allowing it to bond better.
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Manufacturing application of semiconductor plasma cleaning machine
Plasma assisted cleaning technology is a kind of precision cleaning technology in advanced manufacturing industry, which can be widely used in many industries. The following is to introduce the application of plasma cleaning technology in semiconductor manufacturing industry. Chemical vapor deposition (CVD) and etching are widely used in semiconductor processing. CVD can be used in the deposition of polysilicon thin films, silicon nitride thin films, silicon dioxide thin films, tungsten and other metal thin films. In addition, CVD technology is also used to connect the micro - three - stage pipe and the thin conductor in the circuit. After the CVD reaction, some residues will deposit in the inner wall of the CVD reaction chamber. The danger here is that these residues will escape from the inner wall and contaminate the subsequent circulation process. Therefore, before the new deposition process begins, the CVD chamber needs to be cleaned with a plasma cleaning machine to maintain the qualified product output. Commonly used cleaning gas is F containing gas such as PFCs and SF6, which can be used as plasma generated gas to clean Sio2 or Si3N4 on the wall of CVD chamber. During the recirculation process, the F atomic energy decomposed by FFC under the action of plasma etched the electrode, the residue on the chamber wall, and the residue on the hardware devices in the chamber. In the plasma cleaning machine cleaning process, a considerable part of the FFC in the chamber did not dissociate into active F atoms. Unless emission reduction technology is adopted, this unreacted gas containing F will eventually escape into the atmosphere. Since these gases are present in the atmosphere for a long time, contributing significantly to global warming and producing four orders of magnitude more heat than carbon dioxide, the International Environment Organization has been developing technologies to reduce their emissions since 1994. Nitrogen has little influence on greenhouse effect and can replace the gas containing F above. Another step in the semiconductor industry is to use a plasma cleaner to clean photoresist made of photosensitive organic material on the surface of the element on the silicone sheet. Before the start of the precipitation process, the remnants of photoresist must be clean, using hot sulfuric acid and hydrogen peroxide solution or other toxic organic solvent to degumming of colloid, it leads to environmental problem, but using plasma cleaning machine to clean, can use the gases such as sulfur trioxide degumming, thus reducing the dependence on chemical solvents and organic solvent. For general manufacturers, the use of plasma to remove adhesive technology, chemical solution can be reduced by more than a thousand times, not only environmental protection, and save a lot of money for enterprises.
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Plasma surface activator
The surface of the material must have good wettability, so that it can be well bonded with the adhesive material in painting, bonding, printing or pressure welding. Not only does dirt containing oil and grease prevent wetting, but the surfaces of many materials cannot be completely wetted by various fluids, adhesives, and coatings. After the liquid drops, even after curing and drying, it cannot be well attached to the surface. The surface can be activated and treated with the plasma surface activator. This is because the substrate has a low surface energy. Normally, materials with a low surface energy are those with a high surface energy that can be wetted, but conversely, materials with a high surface energy are those that cannot be wetted. The surface energy of the liquid added, also known as surface tension, must in any case be lower than the surface energy of the substrate. Most plastics have a very low surface energy, and because the surface is nonpolar, liquid molecules cannot find connections where they can aggregate and therefore cannot be wetted by adhesives and coatings. The surface energy of the material surface is increased so that the surface is activated and the activated surface establishes a gathering point for the added liquid. Chemical primers and liquid adhesion promoters can generally be used to activate the material surface. But the treatment is often corrosive and harmful to the environment. On the one hand, adequate ventilation must be carried out before follow-up processing; on the other hand, activation state cannot be maintained for a long time. Nonpolar materials such as polyolefin cannot be fully activated by chemical primers. In addition, it can be activated in the arc corona. This is a form of atmospheric pressure plasma surface activated machine treatment, but only for flat or convex surfaces, where an arc is introduced. For atmospheric plasma activation cleaning machine, arc plasma will be ejected through the nozzle, so the surface of complex parts can also be activated. When activated in an air or oxygen plasma, the nonpolar hydrogen bonds of plastic polymers can be replaced by oxygen bonds. It can provide free valence electrons to bond with liquid molecules, thus improving the surface polarity. "Non-viscous" plastics, such as polyformaldehyde, polyethylene and polypropylene, can also have good adhesion and sprayability when activated by plasma at low or atmospheric pressure. The required surface energy can be adjusted very precisely, which also prevents over-activation, which can lead to etching. In a low pressure plasma, gases other than air and oxygen can be used, and these gases must be able to adsorb nitrogen (N2), amine (NHx), or carbonyl (-COOh) at the position of oxygen as the reaction group. The surface of the plastic remains active for 24 hours. However, follow-up treatment should be carried out as soon as possible, because with aging, new dirt will be absorbed. Adhesion of PTFE can also be achieved by plasma treatment, however it is not activated but etched. Metals, ceramics and glass usually have higher surface energy than plastics. If they need to be bonded or printed, it is advantageous to use plasma-surface activators for activation. The surface tension of the solder alloy is very high, however, some of it will still come off the metal surface. Therefore, plasma activation can improve the wettability during the welding process. The activation of the metal is mostly short and the welding must be carried out immediately.
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Plasma surface processor lithium battery electrode coating pretreatment
The production and manufacture of lithium ion battery is a process closely linked by each process step. Generally speaking, the production of lithium battery includes the fabrication process of electrode, fabrication process of cell and assembly process of battery. In the three stages of the process, each process can be divided into several key processes, each step will have a great impact on the final performance of the battery. So the application of plasma surface processor in lithium battery industry arises at the right moment. Lithium battery Market Analysis: With the in-depth study of the relationship between electrode material structure and performance, the design of positive and negative electrode materials with a variety of structured structures or doped with a variety of composite structures at the molecular level will strongly promote the research and application of lithium ion batteries. After nickel-Cadmium and nickel-hydrogen batteries, lithium-ion batteries will be a very long time in the future, with good market prospects. According to the demand trend, electric vehicle market will gradually become a large field of lithium battery application. GGII predicts that the global sales of new energy vehicles in 2022 will reach 6 million units, an increase of 2.7 times compared with 2017, which is affected by the following factors: continuous promotion of policies, technological progress, changes in consumer habits, popularization of supporting facilities, and the demand for lithium batteries for electric vehicles will exceed 325GWh in the same period, an increase of 3.7 times compared with 2017. Meanwhile, competition in the lithium battery industry will mainly focus on the field of new energy vehicles. Power battery in the future will be the largest in lithium ion batteries growth engine, its development in the direction of high energy density, high security is set, the trend of high-end digital lithium ion battery power battery and lithium ion battery market is the main growth point, lithium electricity under 6 microns copper foil will become key raw materials of lithium ion battery, become the focus of the mainstream enterprise layout. Selection of coating equipment and coating process: Coating process includes: uncoiling → splicing → tension control → coating → drying → rectifying → Tension control → rectifying → winding and so on. Coating technology is complex, and factors influencing the coating effect is more, such as: the manufacturing precision of equipment, the stability of the equipment operation, dynamic tension control in the process of coating, drying air flow and temperature control curve, such as size, so choose the appropriate coating process is very important, the plasma surface treatment machine will show the reliability of it. Common coating methods need to be considered from the following aspects: coating layer number, wet coating thickness, coating liquid rheological property, required coating accuracy, coating support or substrate, coating speed. Base materials - Copper foil and aluminium foil: Surface tension: the surface tension of copper and aluminum foil must be greater than the surface tension of the coating solution, otherwise the solution on the substrate tile will be very difficult, resulting in poor coating quality. One rule that must be followed is that the surface tension of the solution to be coated should be 5dynes/cm lower than the substrate, although this is only a rough calculation. The surface tension of solution and substrate can be adjusted by adjusting the formula or substrate surface treatment. The measurement of both surface tensions should also be used as a test item for quality control. Because the coating process has a high demand on the surface tension of the substrate, so the plasma cleaning can effectively solve this problem. Before sputtering, painting, bonding, welding, brazing and PVD and CVD coating, the surface of aluminum foil metal often has organic matters and oxidation layers such as grease and grease, which all need cleaning treatment to get a completely clean and non-oxidized surface. However, most of the existing technologies use chemical cleaning methods, which require solvents, are not environmentally friendly, and are prone to "hydrogen embrittle" phenomenon. The deconvolution effect is not ideal, the deconvolution speed is slow, and the mechanical performance index of aluminum foil is easily affected. The use of plasma cleaning surface processor can solve the above problems. The anode and cathode materials of lithium battery pack are coated with the anode and cathode materials of lithium battery. When the electrode materials are coated with the metal strip, the metal strip needs to be cleaned. The metal strip is generally aluminum or copper thin. Dry cleaning plasma cleaning function can effectively solve the above problems.
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Surface treatment of carbon fiber plasma improves hydrophilicity
As an important fiber material, carbon fiber has high specific strength, high specific modulus, high temperature resistance, corrosion resistance and other excellent properties. It has been widely used in national defense and military industry, aerospace, weapons and equipment, transportation, biomedicine and other high-tech industries. But, as a result of carbon fiber is made of flake graphite crystallite organic fiber, such as along the fiber axial inclination of microcrystalline ink material, its surface is highly crystallization and non-polarity flake graphite layer structure, chemical inertness, lead to their table interface performance is poorer, the serious influence subsequent comprehensive performance of composite materials, is limited under the specific conditions of application, plasma surface treatment technology can improve the problem. At present, surface modification of carbon fiber has become an indispensable part in the process of carbon fiber production. Manufacturers such as Toray of Japan, Mitsubishi Rayon of Japan and Siguri of Germany have used surface modification as an important indicator of carbon fibre quality. Therefore, surface modification of carbon fiber to improve its surface hydrophilic properties is the key to the production and application of carbon fiber. In the past few years, a great deal of research has been done on the surface modification of carbon fiber. Among these factors, improving the surface roughness and increasing the surface chemical functional groups are the keys to improve the surface interface properties of carbon fiber. The common methods of surface modification of carbon fiber include surface oxidation, surface coating, high-energy ray irradiation, supercritical fluid surface grafting and plasma surface modification. The electrochemical oxidation process has the characteristics of strong continuity of production and easy control of process conditions, which has been applied in industry. But it still USES a lot of chemicals, consumes a lot of energy, produces a lot of waste water and liquid, and is difficult to oxidize for high-modulus carbon fiber, requiring extended treatment time. Compared with the traditional plasma surface modification technology, it is the most widely used method with the advantages of clean environment protection, time saving and high efficiency. The working principle of plasma surface treatment mainly includes two aspects: on the one hand, free radicals and polar groups are formed on the fiber surface through active particles, so as to improve the free energy and wettability of the fiber surface; On the other hand, the surface area and surface roughness of the fiber are increased by etching to remove pollutants from the fiber surface. The surface modification of carbon fiber in aqueous solution was carried out by surface treatment of atmospheric plasma cleaning machine, and the hydrophilic modification of carbon fiber surface slurry was carried out at the same time by using the interaction between active particles and water molecules in plasma.
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