• 제목/요약/키워드: Wool Wheel

검색결과 3건 처리시간 0.022초

Si Cathode 개발을 위한 연삭 및 폴리싱 가공특성 (Processing Characteristics of Grinding & Polishing for Si Cathode Development)

  • 채승수;이충석;김택수;이상민;허찬;이종찬
    • 한국기계가공학회지
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    • 제9권2호
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    • pp.26-32
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    • 2010
  • This paper reports some experimental result in grinding and polishing of silicon cathodes used in semiconductor manufacturing process. Cup shape diamond core wheels were used in experiments and the radial and tangential grinding forces were measured with surface roughness. In polishing experiments, flat type and donut type wool polishing tools were tested. The experimental results indicate that the grinding forces are proportional to the material removal rates and the surface roughness are inversely proportional to the spindle speed. The surface roughness of polished Si decreases with polishing time and higher spindle speed.

양송이 색소의 특성과 염색성에 관한 연구 (II) -양송이 색소의 염색성과 견뢰도- (A Study on the Characterization and Dyeability of Mushroom Colorant (II) Dyeability and colorfastness of mushroom colorant-)

  • 서영숙;정지윤
    • 한국의류학회지
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    • 제21권2호
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    • pp.406-413
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    • 1997
  • The dyeability and colorfastness of browning extracts from mushroom were investigated. The results of this study are as follows, 1. Browning extracts from mushroom exhibited dyeability to wool, nylon and silk. The wool and silk had the greatest K/S value at pH 4 and nylon at pH 5 2. Furthermore, the increase in K/S value corresponded to temperature, time, and the number of dyeing. 3. In most cases, the value of K/S was increased by mordant treatment. The treatment of pre-mordant caused the increase in K/S value depending on the concentration of mordant, but not in the color. Co.mordant and post-mordant treaments, however, showed various colors of YR, Y, and GY types of Munsell color wheel. 4. In the most cases, color fastness of light, drycleaning, laundry, sweat, rubbing was excellent.

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천연 쑥과 쪽을 이용한 단백질 섬유의 녹색 염색 (Dyeing Protein Fiber to Green Color Using Natural Mugwort and Indigo)

  • 유혜자
    • 대한가정학회지
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    • 제45권4호
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    • pp.53-59
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    • 2007
  • We need to diversify the colors by natural dyeing for promotion and extention of the natural dyes market, because natural dyestuffs have the limitation the number of the colors to express, compare to synthetic dyestuffs. It was investigated that wool and silk fabrics could be dyed to green colors using natural mugwort and indigo as one of color diversification, in order to express green color that is difficult to be shown by natural dyeing. The mugwort dyebath was prepared to concentration of $25{\sim}100g/l$ using dried mugwort plant and indigo dyebath was prepared to concentration of $5{\sim}20g/l$ using natural indigo powder. Wool fabrics and silk fabrics were dyed to green(GY, G, BG in Munsell color wheel) by two batch methods using the mugwort and indigo dyebaths. the mugwort dyeing was applied at $80^{\circ}C$ for 20minutes and indigo dyeing applied for $5{\sim}7$ minutes in room temperature. The colorfastness to drycleaning and abrasion of the dyed fabrics were shown good as grade 4-5 or 5.