• Title/Summary/Keyword: Blistering

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Studies on the Blistering Resistance(I) - The influence of pigment ratio on blistering resistance - (블리스터링에 관한 연구(제1보) - 안료의 배합비가 블리스터링에 미치는 영향 -)

  • Lim, Won-Seok;Ha, Young-Baeck;Kim, Chang-Keun;Lee, Yong-Kyu
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.39 no.2 s.120
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    • pp.25-30
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    • 2007
  • Recently the use of web offset printing has been increasing, which can provide high print speed, mass production, and high print quality. However, high speed web offset printing has frequently undergone a blistering problem when the printed paper passes through hot air dryers. Blistering occurs in the middle of the base paper or in the coating layer. This paper focused on the blistering occurring in the base paper. In order to elucidate the effect of pigment ratio on blistering, 6 types of coating color were prepared with varying GCC/clay ratios and printability and blistering were investigated focusing on structure changes in the coating layer. When the clay content in the coating layer was increased, surface roughness and surface strength were decreased and paper gloss was increased. In addition, it was found that the coating layer structure with high clay content, which contains lots of discontinuous pores, hindered water vapors to penetrate out and, as a result, blistering occurred.

Study on Applicability of Passive Infrared Thermography Analysis for Blistering Detection of Stone Cultural Heritage (석조문화유산의 박리검출을 위한 수동적 적외선 열화상분석의 적용성 연구)

  • Jo, Young Hoon;Lee, Chan Hee;Yoo, Ji Hyun
    • Journal of Conservation Science
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    • v.29 no.1
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    • pp.55-67
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    • 2013
  • This study focused on analysis condition and application method of the passive infrared thermography according to the direction and time to nondestructively detect the blistering zone of stone cultural heritage. As a result, the passive thermographic images showed different temperature characteristics by time because it sensitively reacts to air temperature, insolation and sunshine direction. In particular, the insolation and sunshine direction, which are periodically changed from 6:00 to 17:00, irregularly made surface temperature. In addition, surface temperature differences were brought on fresh zones and blistering zones except specific time since blistering causes erratic thermal transfer. As a result of examining the detection characteristics of blistering by time, the blistering was well detected between 9:00 and 10:00 when there was rapid increase in air temperature and insolation in all direction except the north. However, this study isn't considered effects of four seasons because it is carried out in autumn, and the passive thermography has difficulty to analyze the quantitative area of blistering zone. Therefore, an additional study for synthetic consideration of the passive thermography analysis about four seasons and quantitative modeling of blistering zone using the active thermography are needed.

Heating & Drying Characteristics of Coating Layer by Induction Heating and Short-wave Infrared Heating (유도가열 및 근적외선 가열방법에 의한 표면처리 강판 도포층의 가열 및 건조 특성)

  • Kim T. S.;Yang J. W.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.08a
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    • pp.249-257
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    • 2004
  • Drying and curing characteristics of PCM resins using the induction heater and short-wave infrared emitter module was studied to develop a compact oven system for the high speed CCL and post-treatment equipment. Drying of the polyester resins using the induction heater and infrared heater showed that the blistering tendency of polyester resin coating increased regardless of additives and colors of resins as the heating rate and/or dry film thickness increased. The blistering of polyester resin coating layer occurred when the heating speed was over than $25^{\circ}C/sec$ for the dry film thickness of $19\~20um$, which is the typical thickness of finish coating in CCL. So did it when the heating speed was over than $40^{\circ}C/sec$ for the dry film thickness over than 10 um. The heating efficiency of paint coated steels by the infrared heating was strongly dependent on the colors of paint coating and generally increased for the dark surface and/or coating. But the faster drying of the PCM resin coatings increased the blistering tendency of coating layer. The blistering limit for the typical finish coating by the infrared heating was estimated as the heating rate slower than $20^{\circ}C/sec$ regardless of colors of PCM resins.

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Viscoelastic Analysis of Osmotic Blistering Behavior of Coating Film

  • Lee, Sang Soon;Park, Myung Kyu
    • Corrosion Science and Technology
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    • v.8 no.1
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    • pp.11-14
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    • 2009
  • The osmotic blistering behavior of polymeric coating film which is in contact with an aqueous environment has been investigated. In this study, the coating film has been assumed to be linearly viscoelastic. Interfacial stresses induced in a laminate model consisting of the viscoelastic film and the elastic substrate as the film absorbs moisture from the ambient environment have been investigated using the time-domain boundary element method. The overall stress intensity factor for interfacial cracks subjected to a uniform osmotic pressure has been computed using the tractions at the crack tip node. The magnitude of stress intensity factors decreases with time due to viscoelastic relaxation, but remains constant at large times.

Optimization of Solid Solution Treatment Process for a High Pressure Die Casting Al-10Si-0.3Mg-0.6Mn alloy to avoid Blistering and Improve the Strength of the Alloy (고압 다이캐스팅으로 제조된 Al-10Si-0.3Mg-0.6Mn 합금에서 blister 발생과 강도의 균형을 고려한 최적 열처리 공정 설계)

  • Kim, Soo-Bae;Cho, Young-Hee;Jo, Min-Su;Lee, Jung-Moo
    • Journal of Korea Foundry Society
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    • v.40 no.3
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    • pp.66-75
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    • 2020
  • The aim of this study was to optimize a solid solution treatment for a high pressure die casting Al-10Si-0.3Mg-0.6Mn alloy to avoid blistering and to improve the strength of the alloy. To achieve this goal, the number density of the blisters and the strength of the alloy under various solid solution treatment (SST) conditions were evaluated. The SST was performed at 470, 490, 510 and 530℃ for 20, 60, 120, 240 and 480 min on the alloy. The number density of the blisters increased with the increasing temperature and time of the SST and the defect area fraction. The yield strength of the alloy after the T6 heat treatment increased with the increasing SST temperature and time. Based on the results, it is suggested that SST should be performed at 510℃ within 60 min. or at 470 and 490℃ within 240 min. to avoid blistering and to improve the strength.

Blistering Induced Degradation of Thermal Stability Al2O3 Passivation Layer in Crystal Si Solar Cells

  • Li, Meng;Shin, Hong-Sik;Jeong, Kwang-Seok;Oh, Sung-Kwen;Lee, Horyeong;Han, Kyumin;Lee, Ga-Won;Lee, Hi-Deok
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.14 no.1
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    • pp.53-60
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    • 2014
  • Different kinds of post-deposition annealing (PDA) by a rapid thermal process (RTP) are used to enhance the field-effect passivation of $Al_2O_3$ film in crystal Si solar cells. To characterize the effects of PDA on $Al_2O_3$ and the interface, metal-insulator semiconductor (MIS) devices were fabricated. The effects of PDA were characterized as functions of RTP temperature from $400{\sim}700^{\circ}C$ and RTP time from 30~120 s. A high temperature PDA can retard the passivation of thin $Al_2O_3$ film in c-Si solar cells. PDA by RTP at $400^{\circ}C$ results in better passivation than a PDA at $400^{\circ}C$ in forming gas ($H_2$ 4% in $N_2$) for 30 minutes. A high thermal budget causes blistering on $Al_2O_3$ film, which degrades its thermal stability and effective lifetime. It is related to the film structure, deposition temperature, thickness of the film, and annealing temperature. RTP shows the possibility of being applied to the PDA of $Al_2O_3$ film. Optimal PDA conditions should be studied for specific $Al_2O_3$ films, considering blistering.

Effect of Fluoride Conversion Coating on the Corrosion Resistance and Adhesion of E-painted AZ31 Magnesium Alloy

  • Fazal, Basit Raza;Moon, Sungmo
    • Journal of the Korean institute of surface engineering
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    • v.49 no.5
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    • pp.395-400
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    • 2016
  • This article reports improved corrosion resistance and adhesion of electro-paint (E-paint) with fluoride conversion coating (FCC) on AZ31 Mg alloy for the first time. These improvements were observed in comparison to chemically polished samples with no chemical conversion coating and samples with cerium conversion coatings (CeCC). FCCs were prepared in a hydrofluoric acid (HF) solution for four different times; 10, 30, 60, and 120 s. The colour of the samples changed from light gold to brown with increasing immersion time, indicating the formation of thicker FCC coatings with increasing immersion time. The adhesion of the E-paint on FCC-coated AZ31 Mg alloy was tested after 500 h of immersion in deionized (DI) water. Salt spray test (SST) results revealed delamination of E-paint on the chemically polished sample, severe blistering on the samples with CeCC, but no delamination and no blistering on the samples with FCC.

A Study on the Corrosion Control for Gas Storage Tanks in the Marine Environment (해양환경 중에서 가스저장탱크의 부식방지에 관한 연구)

  • Jeong, Ki-Cheol
    • Journal of Fisheries and Marine Sciences Education
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    • v.10 no.1
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    • pp.79-86
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    • 1998
  • In this study, the adhesive effect, blistering behavior and electrochemical polarization behavior of red lead film by the pretreatment work of sandblasting and potassium chromate($K_2CrO_4$) were investigated to prevent the corrosion of gas storage tank under marine environment. The main results obtained are as follows : 1) The adhesive effect of red lead film by the pretreatment work of sandblasting and potassium chromate is more improved than that of red lead film. 2) The blistering occurrence of red lead film by the pretreatment work of sandblasting and potassium chromate is more delayed than that of red lead film. 3) As the anodic potential is increased, corrosion current density of red lead film by the pre treatment work of sandblasting and potassium chromate is lower drained than that of red lead film.

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