• Title/Summary/Keyword: Corona treatment

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The study on characteristics of corona ignitor for surface treatment of insulator (절연재료의 표면개질을 위한 코로나 발생기의 특성에 관한 연구)

  • ;;;;Y.Tabata;J.S Chang
    • Electrical & Electronic Materials
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    • v.8 no.4
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    • pp.504-508
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    • 1995
  • The purpose of this research is to study on characteristics of corona ignitor which was designed for ignition of plasma, used at hard coating, surface treatment and thin film preparation, at high pressure. Corona ignitor composed of hollow type inner electrode and ring type external electrode. Though corona voltage increased with increasing distance between electrodes, corona discharge can be controlled stably. The gas flow in hollow type inner electrode and the construction between electrodes affect a length of corona flame and corona phenomenon. It is possible to ignite the . plasma, usually generated at low pressure(10 Torr), at high pressure(100 Torr) by corona ignitor.

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The Physicochemical Characteristics of PET Fabrics Treated with Low Temperature Glow Plasma and Atmospheric Corona Discharge (진공 저온 플라즈마와 대기압 코로나 방전가공 PET 직물의 물리화학적 특성)

  • Ma, Jaehyuk;Yang, Jinyoung;Koo, Kang;Yang, Hyun A;Park, Youngmi
    • Textile Coloration and Finishing
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    • v.26 no.3
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    • pp.201-208
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    • 2014
  • The high value-added functionality for synthetic fiber can be considered through a plasma enhanced treatment. In this study, PET(Polyethyleneterephthalate) was treated with a glow plasma and corona treatment. Surface characteristics of treated fabric were investigated using electron scanning microscopy(SEM), contact angle, X-ray photoelectron spectroscopy(XPS), tensile and adhesion strength. It was found that the contact angle showed $85.5^{\circ}$ for untreated fabric, $0^{\circ}$ for plasma and corona treatment at the condition of 200W for 7min. By XPS analysis, atomic ratio of O 1s/C 1s was increased from 0.27 to 0.43 by glow plasma and 0.27 to 0.41 by corona treatment at 200W for 7min, respectively. Glow plasma and corona treatment did not significantly change the tensile strength of PET fabric. Adhesion strength showed a substantial enhancement for the surface treated with the glow plasma, while corona treatment was adversely affected.

Improvement of Transparent Electrodes Based on Carbon Nanotubes Via Corona Treatment on Substrate Surface (기판의 코로나 표면처리에 의한 탄소 나노튜브 투명전극의 물성 향상)

  • Han, Sang-Hoon;Kim, Bu-Jong;Park, Jin-Seok
    • Journal of the Semiconductor & Display Technology
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    • v.13 no.1
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    • pp.7-12
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    • 2014
  • In this study, we investigate the effects of corona-discharge pre-treatment on the properties of carbon nanotubes (CNTs) which are used as flexible transparent electrodes. The CNTs are deposited on PET (polyethylene terephthalate) substrates using a spray coating method. Prior to the deposition of CNTs, the PET substrates are corona-treated by varying the feeding directions of the PET substrate and the numbers of treatments. The variations in the surface morphologies and roughnesses of the PET substrates due to corona-treatment are characterized via atomic force microscopy (AFM). Dynamic contact angles (DCAs) of the corona-treated PET substrates are measured and analyzed as functions of the treatment conditions. Also, the sheet resistances and visible-range transmittances of the CNTs deposited on PET substrates are measured before and after bending test. The experimental results obtained in this study provide strong evidences that the adhesive forces between CNTs and PET substrates can be substantially enhanced by corona-discharge pretreatment.

The Comparison of Adhesion Properties on Polyester Fabric by AC and DC Corona Treatment (AC와 DC 코로나 처리에 따른 폴리에스테르 직물의 접착성질 비교)

  • Lee, Jae Ho
    • Journal of Adhesion and Interface
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    • v.17 no.3
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    • pp.104-109
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    • 2016
  • Compare AC corona and DC corona treatment effects, polyester fabrics were AC corona treated with different current intensity (5, 10, 15 A) and feeding speed (5, 10, 15 m/min) as the same DC corona treatment conditions of the preceding research. We confirmed the surface change of polyester fabrics using scanning electron microscopy (SEM) and X-ray photoelectron spectrometer (XPS), and the change of physical properties through measuring the dry and wet bonding strength. The surface changes of polyester fabrics by treating in air atmosphere with AC corona discharge are shown similar tendency with DC corona discharge. Generally dry bonding strength were increased with increasing current intensity and feeding speed, but wet bonding strength were increased with increasing current intensity and decreasing feeding speed in both AC and DC corona treatment. When the current is 20 A, carbonization occurs in DC corona discharge but carbonization does not occur in DC corona discharge.

Surface treatment of polyethylene terephthalate films by corona discharge (코로나방전에 의한 polyethylene terephthalate 필름의 표면처리)

  • 김명룡
    • Electrical & Electronic Materials
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    • v.8 no.3
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    • pp.316-323
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    • 1995
  • A vital step in magnetic tape manufacturing is the surface modification of polymer substrate prior to ink application. A critical element for good adhesion of magnetic ink on polymeric substrate is the ability to join ink in cost-effective manner. Corona discharging is one of the effective methods of modifying polymer surface to improve adhesion while maintaining the desirable properties of the film itself. Surface treatment by corona which is exposure of film surface to electron or ion bombardment, rather than mere exposure to active species, like atomic oxygen or ozone, can enhance adhesion by removing contaminant, electret, roughening surface, and/or introducing reactive chemical groups. Reactive neutrals, ions, electron and photons generated during the corona treatment interact simultaneously with polymers to alter surface chemical composition, wettability, and thus film adhesion. However, it is highly recommended that extensive chains scission be avoided because it can lead to side-effect by forming sticky matter, resulting in dropouts. This paper reviews principles of surface preparation of polymer substrate by corona discharging. In addition, the experimental section provides a description of parameter optimization on corona discharging treatment and its side-effect. Experimental results are discussed in terms of surface wetting as determined by contact angle measurements.

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Surface Safety Characteristics of Polypropylene Surface Treatment by Variation of Rolling Speed and The Electric Power of Corona Discharge (코로나방전 표면 처리시 이동속도 및 공급전력 변화에 따른 폴리프로필렌 표면 안전성 특성)

  • Lee, Su Hwan;Lee, Dong Hoon
    • Journal of the Korean Society of Safety
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    • v.33 no.1
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    • pp.41-46
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    • 2018
  • Experiments were carried out the phenomenal observation on effect of corona treated hotmelt laminating film in process of manufacture by 2 kinds of rolling speed and electric power variatons. Surface treatment by corona which is exposure of film surface to electron of ion bombardment, rather than mere exposure to active species, like atomic oxygen or ozone, can enhance adhesion by removing contaminant, electret, roughening surface, and introducing reactive chemical group. Reactive neutrals, ions, electron and photons generated during the corona treatment interact simultaneously with polymers to alter surface chemical composition, wettability, and thus film adhesion. However, it is highly recommended that extensive chains scission is avoided because it can lead to side-effect by forming sticky matter, resulting in dropouts. This paper reviews principles of surface preparation of polypropylene substrate by corona discharging. In addition, the experimental section provides a description of parameter optimization on corona discharging treatment and its side-effect. Experimental results are discussed in terms of surface wetting as determined by contact angle and SEM measurements. When the rolling speed of the film decreased from 1.666 [m / sec] to 0.083 [m / sec], contact angle decreased from $80[^{\circ}]$ to $64[^{\circ}]$, and the wettability was greatly improved. As the supply power increased from 0.4 [kVA] to 2 [kVA] at the corona discharge surface treatment, the contact angle decreased from $77[^{\circ}]$ to $65[^{\circ}]$, and the wettability was greatly improved.

Effect of Corona Treatment of Polymers on Bonds to Aluminum (高分子 物質의 表面에너지 增加에 對한 새로운 理論. 高分子 物質의 코로나 放電處理가 알루미늄과의 接着强度에 주는 影響)

  • Kim Chung Yup;Sung Ki Joong
    • Journal of the Korean Chemical Society
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    • v.20 no.5
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    • pp.417-423
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    • 1976
  • Corona treatment of PE, PP and PVC showed a dramatic increase of bond strength when lap joints were made between the polymers and aluminum plates. Heating the corona-treated PE and PP, and PVC in a drying oven at 80 and $50^{\circ}C$, respectively, for 15 min reduced the bond strength to about a half of that of corona-treated but unheated polymers, which indicated that the increase of bond strength was not due to oxidation of the polymer surface. The Weibull distribution function was employed to check reliability of the scattered data obtained from testing the lap joints. It is speculated that electron was deposited on the corona-treated polymer surface to enhance bond strength with aluminum.

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The Effect of Corona Treated on Laminating Film and Its Analytical Study by SEM (라미네이팅 필름의 코로나 처리 효과와 주사 전자현미경을 이용한 해석)

  • Kim, Jong-Gyu;Kim, Yang-Pioung
    • Journal of the Korean Graphic Arts Communication Society
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    • v.26 no.2
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    • pp.15-30
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    • 2008
  • Studies were carried out the phenomenal observation on the effect of corona treated hotmelt laminating film in process of manufacture by 2 kinds of experiments. These are as follow: 1) In order to verify the treatment reducing value of dynes and dynes durability with the lapse of time, it was checked dynes of a pair of 4 bar discharge electrode with 9 one for 144 hr., and it show results that 9 bar discharge electrode has higher initial dynes as well as keep up 48 dynes durability long than 4 one. 2) Drawn an inference from 3 actions -Chemical-Physical-Mechanical, on laminating film in terms of SEM's observation that are the adhesive status in boundary of corona treated base film, extrusion coating hotmelt layer, and configuration of hotmelt surface after corona treated. In tandem system, EVA layers adhesion keep its stability without corona discharge treatment.

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Functional Finishing of Nonwoven Filter for Dust-proof/Medical Masks by Corona Discharging Treatment (코로나 방전에 의한 방진/의료용 마스크 여과재의 기능화 가공)

  • Hong, Young-Ki
    • Textile Coloration and Finishing
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    • v.25 no.3
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    • pp.232-239
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    • 2013
  • In this study, 25gsm melt-blown polypropylene nonwoven for dust-proof/medical masks was finished by the corona discharging treatment. The influence of corona discharging parameters on the filtration efficiency was investigated. Several parameters such as discharging voltage, discharging speed, distance to discharging wire and configuration of discharging system had an effect on filtration efficiency, while the parameters had no effect on breathing resistance. Optimum corona discharging conditions are as follows: Wires were installed on the upper part of the nonwoven and paper pipe was installed on the lower part of the nonwoven having a distance of 5cm. The sequence of wire voltages was +60 kV, +60 kV, 0, -60 kV, and -60 kV. The discharging voltage and speed were 60 kV and 30m/min respectively. The nonwoven treated by corona discharging at the optimum condition showed a filtration efficiency of 80% or more, which is suitable for dust-proof/medical masks.

Reentrainment of Carbon Soot Particles in a Corona Discharge Reactor (코로나 방전 반응기에서 Carbon Soot 입자의 재비산)

  • Lee, Jae-Bok;Hwang, Jung-Ho;Bae, Gwi-Nam
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.24 no.7
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    • pp.1002-1009
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    • 2000
  • Among the various types of diesel after-treatment device, the corona discharge reactor may be considered as a powerful process for trapping submicron particles. But after precipitation on the electrodes occurs, the reentrainment of particles is severe and often causes low or negative precipitation efficiency. Experiments were performed to investigate the effect of an applied voltage on the reentrainment of soot particles from the electrodes. A co-annular laminar diffusion flame burner was used as the soot generator. When a highly negative voltage was applied, exfoliation of the deposited soot particles and an increase in concentration of particles smaller than approximately 150 nm were observed. Turbulence induced from the negative tuft corona and sputtering caused particle reentrainment from the corona wire and from plates as well. Under soot laden combustion gas, a streamer corona often occurred in the wire-cylinder reactor. Because of its transient nature, streamer corona violently increased the concentration of reentrained particles and CO gas.