• Title/Summary/Keyword: 습식가공

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Analysis of Multi-Pass Wet Wire Drawing Process and Its Application (다단 습식 신선공정 해석 및 적용)

  • Lee S. K.;Kim B. M.
    • Transactions of Materials Processing
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    • v.14 no.8 s.80
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    • pp.689-695
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    • 2005
  • Multi-pass wet wire drawing process is used to produce fine wire in the industrial field. The production of fine wire through multi-pass wet wire drawing process with appropriate dies pass schedule would be impossible without understanding the relationship among many process parameters such as material properties, dies reduction, friction conditions, drawing speed etc However, in the industrial field, dies pass schedule of multi-pass wet wire drawing process has been executed by trial and error of experts. This study investigated the relationship among many process parameters quantitatively to obtain the important process information fur the appropriate pass schedule of multi-pass wet wire drawing process. Therefore, it is possible to predict the many important process parameters of multi-pass wet wire drawing process such as dies reduction, machine reduction, drawing force, backtension force, slip rate, slip velocity rate, power etc. The validity of the analyzed drawing force was verified by FE simulation and multi-pass wet wire drawing experiment. Also, pass redesign was performed based on the analyzed results, and the wire breakage between the original pass schedule and the redesigned pass schedule was compared through experiment.

Preparation and Physical Characteristics of High-Performance Heat Storage.Release Fabrics with PCMMc : Wet coating process (상전이 마이크로캡슐이 함유된 고기능성 축열.발열 직물의 제조 및 물리적 특성 : 습식코팅)

  • Koo, Kang;Choe, Jong-Deok;Choi, Jong-Suk;Kim, Eun-Ae;Park, Young-Mi
    • Textile Coloration and Finishing
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    • v.19 no.1 s.92
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    • pp.24-30
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    • 2007
  • Heat storage/release system in textile is a useful tool to increase energy efficiency and enhance comfortable microclimate of clothing. Phase change materials(PCM) are used in regulating storage and release properties of thermal energy. To investigate the temperature regulating ability of fabrics with PCM microcapsule(PCMMc), Nylon fabrics were coated with PCMMc via wet processing and they were characterized by SEM, DSC and infrared thermal analyzer. Also, water moisture transpiration, water penetration resistance, peel strength and washing durability of the fabrics were assessed. The water vapor permeation and water penetration resistance decreased with increasing PCMMc content. In DSC analysis, it can be seen that the microencapsulated fabric showed both exothermic md endothermic phenomena at specific temperature. Peel strength was decreased with increasing PCMMc content.

Pass Design of wet-Drawing with Ultra High Speed for Steel Cord (Steel Cord 생산을 위한 초고속 습식 신선 패스 설계)

  • Hwang Won Ho;Lee Sang Gon;Kim Byung Min;Ko Woo Shick
    • Transactions of Materials Processing
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    • v.14 no.9 s.81
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    • pp.785-790
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    • 2005
  • High-speed multi-pass wet wire drawing has become very common for production of high-carbon steel cord because of the increase in customer demand and production rates in real industrial fields. Although, the wet wire drawing process is performed at a high speed usually above 1000m/min, greater speed is required to improve productivity. However, in the high-carbon steel wire drawing process, the wire temperature rises greatly as the drawing speed increase. The excessive temperature rise makes the wire more brittle and finally leads to wire breakage. In this study, the variations in wire temperature during the multi-pass wet wire drawing process were investigated. A multi-pass wet wire drawing process with 21 passes, which is used to produce steel cord, was redesigned by considering the increase in temperature. Through a wet wire drawing experiment, it was possible to increase the maximum final drawing speed to 2000m/min.

Effects of Surfactants on Dispersion Behavior of Vectran® in Water(II) -Study on the Manufacture and Properties of Wet-laid Nonwoven Fabrics- (Vectran®의 수중 분산 거동에 미치는 계면활성제의 영향(II) - 습식부직포의 제조와 그 물성연구 -)

  • Kang, Yoo-Jung;Song, Sun-Hye
    • Textile Coloration and Finishing
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    • v.27 no.4
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    • pp.327-333
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    • 2015
  • This paper aims to manufacture nonwoven fabrics by wet-laid technology using Vectran$^{(R)}$ one of the highly favoured high-performace fiber. In previous study, a novel evaluation on fiber dispersion was studied to select optimum surfactant by the need for the control of fiber dispersion in water with reference to wet-laid nonwoven technology. 3 Types of sulfonate anionic surfactants were chosen and added in a stage of agitation to improve dispersion behavior of fibers in water. It was observed that the state of fiber dispersion in water affected various properties of nonwovens, including appearance, physical properties, and mechanical properties. Nonwoven added SDBS was uniform in web structure, thickness and weight. Its average pore was small in size and consisted of fine pores and the value of porosity was high. Further, the difference of tensile value between 2 directions was the least. Consequentially, as the dispersion behavior of fiber increases, nonwoven shows more balanced and uniform physical properties in all directions.

Preparation and characteristics of Wet laid paper filter on pulp/activated carbon (습식공정을 이용한 펄프/활성탄 종이필터의 제조 및 특성)

  • Kang, Seung-Uck;Kim, Hyun-Chul;Kim, Wan-Jin;Jang, Hea-Jin
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2011.11a
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    • pp.43-43
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    • 2011
  • 현대인들은 생활환경에서 발생하는 각종 미세먼지 등의 입자상 오염물질 뿐만 아니라 각종 VOCs 등의 가스상 오염물질과 곰팡이, 박테리아, 바이러스 등 생물학적 오염물질까지 생활공간 내의 공기환경은 점점 악화 되고 있으며 공기 정화 등의 필요성이 증대 되고 있다. 이에 본 연구에서는 닥 펄프와 활성탄이 주성분인 Sheet를 Corrugation 장치를 통해 편파형(골판지)으로 제작하고, 다시 다층 구조로 적층된 골판지 sheet을 제작한 후 이를 두께 방향으로 일정 폭(20mm이하)으로 절단하여 필터부품의 소자로 이용하는 활성탄 필터의 제조 및 그 특성을 확인하고자 하였다. 닥펄프/펄프와 무기물의 혼합비, 해리시간 등의 변화를 주어 샘플을 만들었고, 강도, 평활성, 생산성 향상을 위해 첨가보조제 선정을 하였다. 이렇게 제조된 필터의 물리적 특성을 알아보고자 인장시험을 실시하였고, 주사전자현미경을 통하여 필터의 평활성과 표면을 관찰하였고 흡착성능 및 기능성을 VOCs 방출량, 탈취율, 항균도, 곰팡이 저항성 등의 실험을 통하여 알아보았다.

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Preparation and Characterization of Alginate-gelatin/silk Wet-laid Nonwoven Fabric (알지네이트-젤라틴/실크 습식부직포 제조 및 특성 연구)

  • Choi, Hyun Jung;Bae, Young Hwan;Lee, Hyun Ho;Yeo, Sang Young
    • Textile Coloration and Finishing
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    • v.32 no.1
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    • pp.57-64
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    • 2020
  • In this study, alginate-gelatin/silk wet-laid nonwoven fabrics were prepared by using alginate gelatin fiber and silk fiber, as the main fiber, and PVA fiber as binder fiber. The characterization of pore size and mechanical property was carried out on the various weight ratios of alginate gelatin fiber and silk fibers, or the adding binder fibers. As the content of silk or binder fiber increases, the tensile strength increases from 0.70 kgf/㎠ to 5.08 kgf/㎠ and the pore size decreases 111.6 ㎛ to 51.00 ㎛. As the weight of the silk increased, the density increased, and binder fiber was added to enhance the cohesion between fibers, thereby increasing the wet-laid nonwoven fabric strength. We studied on wet-laid nonwoven fabrics that can be applied to mask sheet with adjustable pore size.

Maskless Pattern Fabrication on Si (100) Surface by Using Nano Indenter with KOH Wet Etching (나노인덴터와 KOH 습식 식각 기술을 병용한 Si(100) 표면의 마스크리스 패턴 제작 기술)

  • 윤성원;신용래;강충길
    • Transactions of Materials Processing
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    • v.12 no.7
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    • pp.640-646
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    • 2003
  • The nanoprobe based on lithography, mainly represented by SPM based technologies, has been recognized as potential application to fabricate the surface nanostructures because of its operational versatility and simplicity. The objective of the work is to suggest new mastless pattern fabrication technique using the combination of machining by nanoindenter and KOH wet etching. The scratch option of the nanoindenter is a very promising method for obtaining nanometer scale features on a large size specimen because it has a very wide working area and load range. Sample line patterns were machined on a silicon surface, which has a native oxide on it, by constant load scratch (CLS) of the Nanoindenter with a Berkovich diamond tip, and they were etched in KOH solutions to investigate chemical characteristics of the machined silicon surface. After the etching process, the convex structure was made because of masking effect of the affected layer generated by nano-scratch. On the basis of this fact, some line patterns with convex structures were fabricated. Achieved patterns can be used as a mold that will be used for mass production processes such as nanoimprint or PDMS molding process. All morphological data of scratch traces were scanned using atomic force microscope (AFM).

Effect of DP Finishing Conditions on the Mechanical Properties and Hand of Cotton Fabrics (DP 가공조건이 면직물의 역학적 성질과 태에 미치는 영향)

  • 신윤숙
    • Journal of the Korean Society of Clothing and Textiles
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    • v.24 no.3
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    • pp.440-447
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    • 2000
  • The effects of DP finishing conditions including process technique and finishing agent on the mechanical properties and hand of cotton fabrics were investigated. 100% cotton fabrics were treated with NMA/DMDHEU and NMA/YF using wet-fixation and steam-fixation process. For comparison, conventional pad-dry-cure process was used with DMDHEU. After DP finishing, tensile and compressional resilience increased and bending hysteresis decreased, resulting in the improvement of dimensional stability of cotton fabric. WF and SF process rendered fabrics better shear properties, tensile energy, and compressional linearity and energy than PDC process. However, SF process produced fabrics with higher geometrical roughness than WF process. After DP finishing, primary hand values except Koshi increased, resulting in the increase of total hand value of cotton fabric.

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Manufacture and Application of Diamond Orifices in Abrasive Suspension Jet for Micro Machining (습식 워터 젯 정밀 절삭 가공용 다이아몬드 오리피스 제조 및 응용)

  • Kim, Youn-Chul;Park, Hee-Dong;Jho, Jae-Han;Kang, Suk-Joong L
    • Journal of Powder Materials
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    • v.15 no.6
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    • pp.509-513
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    • 2008
  • High-pressure abrasive entrained jet have rapidly become important machining technology over the last two decades. However, suspension jet by high-pressure has been recently developed for packaging sawing. Ideally, diamond materials should be used for components in abrasive water-jet systems that are subject to high erosive conditions. Using the diamond orifices improve maintenance and extend wear part life. This paper gives insights to using an abrasive suspension jet with diamond orifice. The influences of orifice material and orifice design are evaluated.

Research for Patent Application Tendency in the Super Fine Machining System Using the Wet Waterjet (습식워터젯을 채용한 초정밀 절삭 가공시스템의 특허동향조사에 관한 연구)

  • Kim, Sung-Min;Ko, Jun-Bin;Park, Hee-Sang
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.18 no.1
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    • pp.1-12
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    • 2009
  • Presently, the semiconductor industry has the chronic problem. In the semiconductor industry, it has the semiconductor wafer, a package, the optical filter cut by using the saw blade, the mold, a laser etc. The cutting technique has the difficulty due to the rising of the production cost by the wearing of mold, the poor quality problem due to generated heat at the moment of cutting procedure and curve cutting etc. The goal of this time of national research and development project is develop the apparatus for solving the problem that the existing cutting technique has. The technology is so called waterjet abrasive method. This technology will be mainly applied to cut a semiconductor package and a wafer. Two important things to be considered are ripple effect(in other words, the scale of a market) and simplicity of an application.