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Plasma sheath for car Cleaning Machine

Plasma sheath for car Cleaning Machine

Plasma, when in contact with to the wall, the electrode in the interface can form a thin layer of electrically neutral be destroyed, the deviation of neutral thin layer known as the plasma sheath, also known as the plasma car washer plasma sheath layer, sheath layer formation is closely related to the plasma shielding effect, plasma is disturbed, the space charge generated by the debye shielding layer.   The plasma sheath can be formed on the surface of the electrode or the wall of the plasma. According to the relationship between the electrode or the wall potential and the plasma potential, the plasma sheath can be divided into ion sheath and electron sheath. The sheath near the electrode of the plasma car cleaning machine: plasma potential is set as Vp and electrode potential as Vs. When the difference between electrode potential Vs and plasma potential Vp is all reached, the external circuit will be connected, and the electrode will have current flowing, which is equivalent to introducing an external electric potential to act on the plasma. When VsNe). With the enhancement of the electric field, a space charge layer composed of ions will be formed within a certain distance from the electrode, namely, the ion sheath. When Vs>Vp, the electric field formed near the electrode will attract electrons and repel ions, and the result is that the electron density is higher than the ion density (Ne>Ni). With the increase of the electric field intensity, a space charge layer composed of electrons, namely the electron sheath, will be formed within a certain distance from the electrode.   The sheath at the floating substrate: when the plasma is inserted into the PLASMA of the PLASMA washer, the charged particles that reach the surface of the insulator either compound with each other at the surface or return to the plasma area because the current cannot pass through. In plasma, as the motion velocity of electrons is greater than that of heavy particles, there will be net negative charge accumulation on the surface of the insulator, that is, the surface is negative potential relative to the plasma area. The negative potential of the surface area repels subsequent electrons moving towards the surface and attracts the positive ions until the negative potential of the surface of the insulator reaches a certain value, equating the current of the ion with the current of the electron. At this time, the surface potential Vf of the insulator tends to be stable, and the difference between Vf and plasma potential (VP-VF) remains constant. There is a space charge layer near the surface of the insulator, and this space charge layer is the ion sheath. Since the insulator in plasma is often referred to as a floating substrate, the potential of the insulator is often called a floating potential. It is obvious that the floating potential is a negative value, and the junction between the floating substrate and the plasma forms a space charge layer composed of positive ions. So any insulator, including the reactor wall, placed in a plasma will form an ionic sheath.   Plasma sheath is one of the important characteristics of plasma body weight. The specific performance of plasma sheath in plasma car cleaning machine is closely related to system temperature T and particle density N. Some important properties of plasma can be understood by studying sheath.

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Application of low-temperature plasma surface treatment technology on plasma aluminized base film

Application of low-temperature plasma surface treatment technology on plasma aluminized base film

As a new surface treatment technology, low temperature plasma surface treatment technology has unique advantages. Low temperature plasma technology adopts gas reaction, the whole process is liquid free and the reaction is fast. It has the advantages of high efficiency, energy saving and environmental protection. Low temperature plasma technology is widely used in a variety of applications, from the microelectronics industry to the manufacture of integrated circuits, to the treatment of a variety of polymer films, and a wide range of toxic waste treatment applications.   Low temperature plasma treatment technology applied to aluminum-based films: The purpose of the aluminized substrate film pretreatment is to improve the adhesion of the aluminized layer, improve the barrier effect of the aluminized layer (such as blocking gas, light, etc.), and improve the uniformity of the aluminized layer. In the plasma pretreatment process, the surface cleaning and activation of the substrate membrane is chemically modified to make it more firmly bound to aluminum metal atoms.   Mobile film roll of polymer membrane plasma processing, can remove dirt from polymer surface, and can easily open the chemical bonds of the polymer surface, making it a free radicals, and with the free radicals, atoms and ions in the plasma reaction produces new functional groups, such as hydroxyl (hydrogen) (OH), cyano (CN), carbonyl (- C = O), carboxyl (-cooh) group or amino (NH3), etc. These chemical groups are key to enhancing adhesion. Carbonyl groups play a key role in adhesion to the aluminum layer by improving the adhesion between polymer surfaces and other materials deposited on these surfaces. These functional groups improve wettability.   Of course, low-temperature plasma surface treatment technology is an effective way to improve the surface properties and functions of various plastic films. After the film surface can be treated, there will be a great improvement, so it will improve the wettability and binding force of these films. Especially for PTFE film, the treatment effect can not be achieved by other treatment methods. Plasma surface treatment technology is a safe and environmentally friendly way.

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Plasma silicon wafer cleaning machine ion energy density

Plasma silicon wafer cleaning machine ion energy density

Energy density refers to the amount of energy stored in a certain space or mass. Therefore, energy density is divided into mass energy density and volumetric energy maximum density. If the density is uniformly distributed in mass or space then the mass energy density is the total energy divided by the total mass of the matter that has that energy; The volumetric energy density of a plasma silicon wafer cleaner is the total energy divided by the volume of the space in which the energy exists. If the density is not uniformly distributed in mass or in space then we have to solve it according to the actual density distribution.   In the plasma silicon wafer cleaning machine, the main factors affecting the plasma energy density are the raw material gas flow rate F and the plasma injection power P. Feed gas flow rate is affected in the reaction system of active particle density and one of the main factors of the collision probability, plasma silicon wafer cleaning machine plasma injection power is generated in the plasma of various active particles (high energy electron, methyl radical, etc.) of reactive oxygen species, energy source, both the dynamic synergy effects available energy density Ed (kJ/mol) description.   Ed=P/F (1-20)   Where, Ed is the energy density (kJ/mol); P is plasma power (kJ/s); F is the molar flow rate of raw gas (mol/s).

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Application of plasma cleaning before adhesion in TP adhesion

Application of plasma cleaning before adhesion in TP adhesion

In the production process of camera modules, plasma plasma cleaning process can significantly improve the quality of camera modules. In the production process of the new generation of camera modules, plasma cleaning is an essential link. Plasma cleaning is widely used in the pre and post links of camera modules DB, WB and HM, and before TP bonding, greatly improving the binding, bonding strength and uniformity.   With the emergence of more and more terminal products, based on the public aesthetic and market demand, the screen takes up an increasing proportion of the width, various "narrow frame", "ultra-narrow frame", "no frame" and other concepts have also swept the whole industry, the pursuit of consumers is no less than metal and glass fuselage. However, due to the current limitations of liquid crystal and structure technology, it is difficult to realize the real bezel-less mobile phone in industrial design, and it is far from being popularized. By contrast, the "narrow border" and "ultra-narrow border" technologies are comparable in terms of structural stability and user experience. Moreover, this technology benefits from the extensive application in terminal products in the past two years, which is relatively mature compared with curved screen technology.   However, there are still some details in the production of ultra-narrow border. Because this technology minimizes the frame as much as possible, the binding surface of TP module and mobile phone shell will be smaller (width less than 1mm), which also leads to problems such as poor adhesion, glue overflow and uneven expansion of hot melt adhesive in the production process. It is worth noting that plasma processing technology has found a way to solve these problems that beset both component and terminal plants. The application of plasma surface processor in the process of fitting the TP module mentioned above with the mobile phone shell has been greatly improved after plasma surface treatment.   The plasma and the surface of the material have microphysical and chemical reactions (the depth of action is only tens to hundreds of nanometers, which will not affect the properties of the material itself), so that the surface of the material can be greatly improved, thus increasing the adhesion between the product and the glue. After plasma processing, the TP module shows the following advantages: 1. Enhanced surface activity, stronger adhesion to the shell, avoiding degumming; 2. The hot melt adhesive is evenly spread to form a continuous adhesive surface, and there is no gap between TP and the shell; 3, due to the increase in the surface energy of the hot melt adhesive, it can be spread thin without weakening the adhesive force, at this time can reduce the amount of glue applied, reduce the cost (about 1/3 of the glue used); In addition, compared with similar cleaning machine equipment, plasma surface processor has obvious advantages in processing technology.   First, the plasma flame width is small, can be designed to 2mm processing range, does not affect other areas do not need to be treated, to reduce accidents;   Second, the temperature is low, in normal use conditions, the plasma flame temperature at room temperature or so, will not reflect the film, LCD and TP surface caused high temperature damage;   Third, the equipment adopts low potential discharge structure, the flame is electrically neutral, does not damage the TP and LCD functions, the product after continuous processing, will not affect the TP capacity and display performance.   With the development of smart phones today, every time the terminal manufacturers launch a product, they must pursue high-quality experience on the basis of the past. For module enterprises, although different processes used in the traditional production process can complete the same production task, but through the continuous improvement of the entire production process, to achieve the overall increase in product yield, is the goal that should be achieved.

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Plasma washer atmospheric pressure pulsed DC discharge plasma

Plasma washer atmospheric pressure pulsed DC discharge plasma

Atmospheric pressure plasma refers to the discharge plasma generated near atmospheric pressure. It does not need to use expensive and cumbersome vacuum system, and its process design is more flexible, showing a broad application prospect in energy gas conversion, material preparation and surface modification, environmental protection and other aspects. In addition, plasma washer atmospheric pressure plasma can discharge directly in the surrounding atmosphere, making it possible to realize plasma medicine.   The common ways of producing atmospheric pressure plasma include DC discharge, dielectric barrier discharge, radio frequency discharge, microwave discharge and pulse discharge. Various forms of atmospheric pressure plasma can be realized through different electrode designs and mode selection. The following is the introduction of plasma cleaner atmospheric pressure pulsed DC discharge plasma.   The pulse voltage parameter of atmospheric pressure pulsed DC discharge plasma has an important influence on the discharge effect. These parameters include the rising edge, falling edge and pulse repetition frequency of the pulse voltage. Compared with traditional AC drive, pulsed DC drive has the advantages of higher electron density, higher average electron energy of plasma and higher energy efficiency.   Atmospheric pressure pulsed DC power supply USES energy storage capacitor, and generates pulse high voltage by rotating spark clearance RSG to discharge load, which has the characteristics of steep rising edge and narrow pulse width, so that energy can be effectively injected into the reactor, and the power supply itself consumes less energy.   The voltage is output by the auto-voltage regulator, which is boosted by the high-voltage transformer and rectified by the full-wave rectifier. Then the energy storage capacitor C1 is charged. When the spark gap RSG1 is switched on, C1 is charged to the pulse capacitor C2 through the current limiting resistor R. At the moment of RSG2 conduction in the rotating spark gap, the energy on C2 is released to the reactor through RSG2, thus obtaining a high voltage pulse in the reactor. Because RSG1 and RSG2 spark-gap are placed on the same rotation axis, they cannot conduct at the same time. This ensures that C1 charging C2 and C2 discharging to the reactor are two independent processes.   By adjusting the output of the auto-voltage regulator, the voltage value on C2 can be changed, thus changing the peak pulse voltage. The pulse width is mainly determined by the volume of C2. The pulse repetition frequency is determined by the rotational speed of the RSG shaft, which can be adjusted by the speed-regulating DC motor. The motor speed regulating part and the pulse high voltage part are electrically isolated by 1:1 isolating transformer. The conversion of positive and negative pulse voltages can be obtained by interchanging the two wires charging C. The low-voltage control part of the power supply (220V) includes voltage regulation and motor speed regulation. The high voltage part and pulse forming part of the plasma cleaner pulse power supply should be placed in the shielding net to prevent electromagnetic radiation from interfering instruments and equipment and harmful to human body. If the mode of cusp discharge is adopted, according to the mode of discharge, the atmospheric pressure pulsed DC discharge can occur between corona discharge and spark discharge.   When the voltage of the charged body at the tip reaches a certain value, local ionization and excitation of the surrounding gas media occur to form a discharge channel. The discharge process is accompanied by a weak glow and sound, and corona discharge occurs when no breakdown or conduction of the electrode occurs. When a breakdown or conduction occurs between the plasma washer electrodes, a spark discharge occurs, accompanied by a strong light and sound. Wang Kangjun studied the effect of pulsed spark discharge and pulsed corona discharge on methane conversion under atmospheric pressure. The results show that the conversion rate of methane and the selectivity of C2 hydrocarbon (mainly including ethane, ethylene and acetylene) in spark discharge are superior to that in corona discharge, and the main C2 hydrocarbon product in spark discharge is acetylene, while the main C2 hydrocarbon product in corona discharge is ethane.

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The surface dyne value of corona treated material is improved

The surface dyne value of corona treated material is improved

Corona treatment is a method of electric shock, it can make the substrate surface has higher adhesion. Principle is the use of high frequency high voltage corona discharge in the processing of plastic surface (high frequency ac voltage up to 5000-15000 - v/m2), low temperature plasma, free radical reaction in the plastic surface, make the polymer become rough, crosslinking and surface will increase the plasma wettability of polar solvent, the plasma by electric shocks and infiltration was printed body surface, the damage was printed the molecular structure of the body, so that the surface of the pending polarized molecules oxidation, ion electric erosion surface, thereby enhancing the adhesion on the surface of the substrates.   The physical and chemical effects of corona treatment on the plastic surface are quite complex, and its effects are mainly in three aspects: 1. Specific electrode system; 2. Material medium on the guide roller; 3. Specific electrode power;   Because different chemical structures have different atomic bonds, the treatment of plastic corona can vary depending on the chemical structure of the plastic, and different types of plastic require different levels of corona treatment.   The practice shows that BOPP film will still change in structure after production, and the polymer will change from amorphous state to crystalline state within a few days, thus affecting the corona treatment effect. After corona treatment, the crosslinking degree of the plastic surface layer is obviously lower than that of the internal layer, so that the functional groups of the plastic surface layer have higher mobility. Therefore, during the storage process, many plastics will appear corona treatment effect decay phenomenon, so that the surface energy is reduced, thus affecting the bonding factor.   In fact, relative humidity will also affect the effect of corona treatment. Generally speaking, humidity has little influence on pole remover and is often ignored within the range of test error. If the connection of the electrical halo treatment, then do not need to consider.   Corona treatment is achieved by changing the surface energy of many substrate, making it easy to combine with printing inks, coating materials and adhesives. In the production process of all the substrate after some treatment, it will have a better adhesion. In the process of substrate production, corona treatment is one of the methods to change the surface energy of substrate. Other treatment methods include flame treatment and coating treatment, which treatment is mainly dependent on the substrate structure.   Corona treatment roughens the surface of the substrate and makes the printing ink and binder easy to bond, but this view was rejected when viewed with a scanning electron microscope. It is now generally believed that corona treatment rearranges the molecular structure of substrate surface to produce more polar parts, which is conducive to external attachment. The unit of measurement of surface energy is dyne. All liquids and most of the substrate can be measured except for multipass. In order for the printing ink to adhere well to the substrate surface, the substrate should have a dyne value 10 times higher than the total ink.   The surface energy of water - based ink is higher than solvent - based ink, so its substrate also has a higher surface dyne value. Everything in nature has the characteristic of returning to its original state. The higher the dyne a paper processor hopes to achieve, the faster the processing energy decays. Therefore, the use of water-based ink printing film, foil and some paper, should be carried out before the second processing. A corona treatment device is used on a printing machine to extend or lengthen the processing level of the film to the original level (or slightly higher).   Processing energy level with time gradually weakened, the use of secondary treatment can remove ink film surface stains, not only can improve the ink adhesion, but also improve the visual effect. With this in mind, it is recommended to use solvent based inks, water-based inks or UV ink substrate film, foil or some paper printing pieces, the substrate surface can be secondary corona treatment.

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