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Plasma surface activator

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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Manufacturing application of semiconductor plasma cleaning machine

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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Plastic plasma surface treatment

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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Plasma surface processor printing, bonding, welding pre - treatment process

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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The plasma cleaning machine adds hydrophilicity to the material

The plasma cleaning machine adds hydrophilicity to the material

In order to better tell you why the plasma cleaning machine can make the material surface hydrophilicity, first of all we have a general understanding of hydrophilicity, the following is some basic explanation of hydrophilicity Baidu Encyclopedia. Hydrophilic property; Hydrophilicity, in layman's terms, has a stronger affinity with water, attracts water molecules, or is easily dissolved in water. Hydrophilic definition: Molecules with polarized groups have a strong affinity for water and can attract water molecules or dissolve in water. The molecules form solid surfaces that are easily wetted by water. Having this property is the hydrophilicity of the substance. Hydrophilicity is a physical property of molecules that can form transient bonds with water through hydrogen bonds. As a result of thermodynamics, this molecule is soluble not only in water but also in other polar solutions. A hydrophilic molecule, or the hydrophilic part of a molecule, capable of polarizing it to form hydrogen bonds and making it more readily soluble in water in oil or other hydrophobic solutions. Hydrophilic and hydrophobic molecules may also be referred to as polar and non-polar molecules, respectively. Hydrophilic principle: Easy hydrogen bond with water is called hydrophilicity. Many hydrophilic groups, such as hydroxyl, carboxyl, amino, and sulfonic acid groups, readily bind to hydrogen bonds and are thus hydrophilic. From the description of the hydrophilic principle mentioned above, we can clearly see that, due to the presence of hydrophilic groups on the surface of the material, these hydrophilic groups are easy to bond with hydrogen bonds, resulting in hydrophilicity. Therefore, it is easy to explain why plasma cleaning makes the material surface hydrophilic. Principle of making materials hydrophilic by plasma cleaning machine: Plasma cleaning machine, also known as plasma surface treatment, is a new high-tech technology, using plasma to achieve conventional cleaning can not achieve the results. Plasma is a state of matter, also known as the fourth state of matter, does not belong to the commonly said solid gas liquid three states. When enough energy is applied to the gas, it dissociates and becomes a plasma. The active components of plasma include ions, electrons, atoms, activating groups, excited nuclides and photons, etc. When the reactive gas is passed into the plasma cleaning machine, complex chemical reactions can occur on the surface of the material, and new functional groups are introduced, such as hydrocarbon group, amino group, carboxyl group, etc., all of which are active groups, which can significantly improve the surface activity of the material. After being treated by gas plasma such as NH3, O2, CO, Ar, N2 and H2, ordinary materials will contact with air, and increase the surface -COOH,-C=O, -NH2, -OH, and other groups to increase their hydrophilicity. The hydrophilic principle of the plasma cleaner is simply that the active particles in the plasma react with the surface of the material to produce hydrophilic groups, thus producing hydrophilicity.

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Plasma cleaning machine Classification

Plasma cleaning machine Classification

According to the different ways of plasma production, the plasma cleaning machine can be classified into which kinds, the following introduction: corona plasma cleaning, glow plasma cleaning, rf plasma cleaning, dielectric barrier plasma cleaning, microwave plasma cleaning and atmospheric pressure plasma arc cleaning these types. Among them, low-pressure plasma cleaning is generally corona plasma cleaning, glow plasma cleaning and rf plasma cleaning, atmospheric plasma cleaning is generally plasma cleaning, microwave plasma cleaning and atmospheric plasma arc cleaning. Corona plasma cleaning machine: Use an electrode with a small radius of curvature and apply a high voltage to it. Due to the small curvature radius of the electrode, the electric field near the electrode area is particularly strong, which is easy to form electron emission and gas ionization, thus forming corona. This method is difficult to obtain stable corona discharge, easy to produce partial arc discharge and discharge energy is not uniform, used in flue gas desulfurization denitrification, automobile exhaust purification and other fields. Glow plasma cleaning machine: At low voltage, a certain voltage can be applied to the two flat electrodes to form a glow discharge, which is a stable self-sustaining discharge with the discharge current at milliamps. It is sustained by secondary electron emission from the cathode bombarded by positive ions. The power supply can be DC or AC. Although a typical large volume and strongly excited low-temperature plasma can be produced, its working pressure is too low to be continuously produced in industrial applications and its application cost is high. At present, it is mainly used for cleaning in semiconductor industry. Rf plasma cleaning machine: Rf discharges are usually operated at low pressure, but can also be operated at normal pressure or even under pressure, characterized by discharge gas not in contact with the electrode. Rf discharge is the use of high frequency electric field to discharge the gas in the reactor, through inductance or capacitance mutation to produce plasma. Due to the high energy and wide range of rf single electrode discharges, it has been used in surface treatment of materials and removal and cracking of toxic wastes. DBD plasma cleaning machine: Between two different discharge electrodes into work gas, with a dielectric cover one or two electrodes, or the medium can be suspended in the discharge space directly, or fill the granular medium, when applying high enough voltage between two electrodes, the gas will be breakdown and between the electrode discharge, dielectric barrier discharge is happened. Dielectric barrier discharges can operate at high pressure and over a wide frequency range. In practical applications, the flat electrode structure is widely used in the modification, grafting, surface tension improvement and hydrophilic modification of polymer and metal films and plates in industry. Microwave plasma cleaning machine: Microwave discharge is a non-electrode discharge, which avoids the influence of discharge materials on the reaction. It can operate over a wide range of frequencies and gas pressures and can produce large volumes of uniformly non-equilibrium plasma. Microwave plasmas are mainly used in material surface machining, modification and hardening treatment of tools, dies and engineering metals. APPA cleaning: Atmospheric atmospheric plasma arc cleaning is the use of high energy density plasma beam directly on the surface of the workpiece. Under the activation of high-energy particles, the layer to be cleaned will produce a series of physical and chemical reactions, such as thermal shock, activation decomposition, thermal expansion, etc., to achieve the purpose of separating pollutants from the workpiece. Different kinds of working gases can be used to deal with different surface pollutants. For example, a mixture of plasma gases can clean both organic dirt on the substrate and oxides on the surface.

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