• 한국산학기술학회논문지
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• 제9권2호
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• pp.500-507
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• 2008

파우더류 화장품의 제조 시 사용되어지는 분쇄기 중 스크린밀, 핀밀, 제트밀을 이용하여, 대표적인 화장품용 안료(탈크, 마이카, 나이론파우더, 실리카, 이산화티탄)를 분쇄하여 각 안료들의 분쇄 특징과 분쇄기의 특성에 대한 연구를 수행하였다. 또한 분쇄평가를 위해 산화철을 흔적물질로써 사용하여 실험하여 CIE LAB의 변화로써 평가하였다. 스크린밀과 핀밀의 분쇄는 박편상 분체에서는 종횡단면의 분쇄 중 종단분쇄가 더 많이 발생하고 제트밀에서는 종횡 단면의 분쇄가 모두 발생하는 것으로 사료되고 구상파우더인 나이론파우더와 실리카의 경우, 1차 입자화 혹은, 역으로 정전기적 인력에 의한 약한 응집이 나타나지만, 제트밀에서는 분쇄압력 2bar의 조건 이상에서는 나이론파우더의 합일 혹은 변형이 발생하고, 실리카는 심한 파쇄가 발생하였고, 이산화티탄은 모든 분쇄기에서 1차입자화가 되었다. 분쇄에 따른 산화철의 색상변화는 핀밀이 가장 우수한 결과를 보였다. 이들 결과로부터 실질적인 제품 제조 공정에서는 박편상 및 침상 원료의 사전처리 이용에는 제트밀을 이용하고, 색상 발현을 위한 분쇄, 즉 조색은 스크린밀과 핀밀을 이용하는 것이 좋을 것으로 판단된다. 또한 산업적인 공정조건을 고려하면, 스크린밀은 4회 분쇄 시, 핀밀은 2회 분쇄 시, 제트밀은 1bar의 분쇄압력 조건 하에서 전반적인 분쇄효율이 우수한 것으로 사료된다.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2003년도 학술발표논문집
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• pp.335-338
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• 2003

The Self-Controlled Screen which removed canal underwear garbage in order to prevent the damage of the arable land that increased by a typhoon and a concentration precipitation was developed. A method to remove garbage let communicate the force that a water mill was run by water pressure in the canal, and occurred in a water mill to Rake, and to have walked on a screen was adopted. As a result of was designed by structure calculation, and was made, and having installed in an experimental laboratory, operation was able to know that was become smoothly well. Afterwards, It is going to test for model development of a water mill to be able to more very generate an influence and force to reach to a canal.

• Journal of the Korean Wood Science and Technology
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• 제44권2호
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• pp.166-171
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• 2016

Size reduction is one of the major pre-processing operations in using biomass as a source of energy or raw materials for forest products industry. The grinding characteristics of dried yellow poplar wood chips were investigated using laboratory knife mill with three different screen aperture diameters to provide the basic information for the optimizing of size reduction processes in biomass industry. Average specific energy consumptions were 0.157, 0.137, and 0.093 Wh/g for the screen aperture diameters of 5.0, 7.5, and 9.0 mm, respectively. According to the results of size distribution analysis of ground particles, the sizes of the most of ground particles were much smaller than the aperture diameters of the screens installed on knife mill used in this study.

• 펄프종이기술
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• 제37권1호
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• pp.17-24
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• 2005

The increase of using low grade ace, the unsorted mixed grade, as fibrous raw materials for the packaging paper results in the increment of fine screen reject owing to the strong tendency to reduce the slot width. Since the most of screen reject consists of undispersed fiber flake, the suitable treatment of the flake could increase the yield of ace recycling and decrease the amount of solid waste. In this work, the novel method combined the mild mechanical treatment by using Tumbling pulper with the biological treatment was developed and applied to the wet strength flake and the fine screen tail line reject originated from a packaging paper mill. The results showed the new method could provide much better efficiency for the disintegration of undispersed flake and for the recovery of fiber from the rejects. The application of the laboratory scaled-Pack pulper showed the possible separation technique for mill application by fractioning effectively the fiber from the treated solid waste.

• 한국건설순환자원학회논문집
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• 제5권4호
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• pp.458-465
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• 2017

본 연구에서는 굴 패각을 원료(골재)로 활용하기 위한 물리적인 가공방법에 관한 것을 실험을 통해 검토하고자 하였다. 실험결과 굴 패각의 형상에 의해 분쇄된 굴 패각의 적정 입도는 10mm 보다 작아야 될 것으로 판단된다. 또한 가동시간과 회수율, 각 입도별 잔류율과 다양한 입도분포를 고려할 때 굴 패각의 분쇄에는 커터 밀이 적합한 것으로 나타났다. 커터 밀의 경우, 8mm의 내부 스크린을 적용할 때, 회수율은 97.3% 12mm를 적용할 때, 98.2%, 20mm일 때, 98.9%로 나타나 스크린 사이즈가 커짐에 따라 회수율은 다소 증가되는 것으로 나타났다. 커터 밀의 내부 스크린과 인버터의 속도 차이에 의한 실험결과 스크린의 크기가 작을수록, 인버터의 속도가 빠를수록 조립률은 낮아지는 것으로 나타났으며, 동일한 스크린에서 인버터 속도의 상승은 더욱 낮은 입도범위의 재료 회수가 가능한 것으로 나타났다.

• 한국광물학회지
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• 제23권3호
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• pp.219-225
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• 2010

저등급 석탄인 갈탄(lignite)을 순환 유동층 가스화기(circulating fluidized bed gasifier)의 효과적인 가스화를 위한 공급탄으로 제조하기 위하여 모든 조건들은 동일하고 스크린의 크기만을 변경하여 목적하는 입도분포 특성을 달성하는 최적조건을 찾기 위한 실험을 수행하였다. 가스화기 공급탄은 0.045~1 mm 크기로 85 wt% 이상이 요구되며 이러한 입도분포를 갖는 공급탄을 제조하기 위해서는 경제적이면서도 효과적인 공정 설계가 반드시 필요하다. 따라서 본 연구는 중국산 갈탄을 해머밀로 효과적으로 분쇄하기 위하여 다구치 설계를 사용하였으며, 설계조건에 따른 실험결과 및 통계분석 결과 95% 유의수준에서 1차 스크린의 크기는 3 mm, 2차 스크린의 크기는 1.3 mm인 경우가 최적화된 조건인 것으로 나타났다.

• Journal of Biosystems Engineering
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• 제22권4호
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• pp.439-450
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• 1997

Most of Korean feed mill has a pregrind system which was suitable for the processing of less number of ingredients and finished products, and good for the mash type feed product. But industries has been changed in production volume and cost, and also from mash to further processed products such as pelleted and extruded. Therefore, Korea feed industries now should change the process, especially the grinding system from the current pregrind to other grind system, but this change will cost a lot of investment and also loosing current grinding system, and should have production shut down during the construction period. To solve these problems, combined grinding system based on a new model mill has been developed. The combined grind system is combination of pregrind and postgrind system, which has the advantages of those two grind systems, and also which can allow to utilize existing pregrind system continuously without any production interruption due to new postgrind system construction. This newly developed model has been applied to the feed mill expansion project of `B`feed company in 1994, and it was very successful application and showed excellent results as we intended. The new model mill, combined grind system applied can save fixed asset investment because old pregrind system can be used as is, and also can reduce production cost and improve product quality. And the possibility of critical production shut down can be much lowered. Within this new grinding model development, multi-screen combination system has been developed for the better grinding texture quality and safer operation. This new model mill with combined grind system will be applied by most feed manufacturing plant and may enhance their production competitiveness, and the further study and development should be continued.

• 한국전기전자재료학회논문지
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• 제24권8호
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• pp.682-685
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• 2011

An engine oil sensor based on multiwall carbon nanotubes was fabricated with screen printing method. Since carbon nanotubes are generally intertwined, dispersion of the carbon nanotubes in the binding agent (ethyl cellulose, a-terpineol, frit) is a key factor for large yield of engine oil sensor. By conventional dispersion method, a hand-mill method, the maximum yield was 80% at most. However, we used the hand ultrasonic, in order to increase the yield of the sensors. As a results, our engine oil sensor fabricated by the screen printing method shows excellent yield rate of 97%, when we dispersed a paste by the hand ultrasonic method.

• 한국식품과학회지
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• 제28권4호
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• pp.702-706
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• 1996

겉보리는 17.2%의 식이섬유를 함유하였으며 도정후에는 7.3%를 함유하였다 도정하지 않은 쌀보리는 14.9%의 식이섬유를 함유하였다. 보리를 Udy cyclone mill로 분쇄한 후 sieve (400 mesh)를 사용하여 식이섬유가 풍부한 부분을 분리한 결과 쌀보리는 7.0% 수용성 식이섬유, 13.7% 불용성 식이섬유, 20.9% 총 식이섬유를 함유하였다. 식이섬유가 풍부한 보리가루를 밀가루에 10, 20, 30% 혼합하여 제빵하였을 때 보리가루의 첨가량이 증가함에 따라 수분흡수율, 반죽시간, 빵의 무게는 증가하였으나 빵의 부피는 감소하였다. 밀가루에 보리가루를 10% 혼합하였을 때 밀가루의 식이섬유는 3.0%에서 3.8%로 증가하였으며 빵의 식이 섬유 함량도 3.0%에서 5.0%로 증가하였다. 관능검사 결과 쌀보리가루를 10%혼합하여 제조한 빵의 관능적 성질은 100% 밀가루빵과 큰 차이를 나타내지 않았다. 제빵후 수용성 식이섬유의 함량은 변화하지 않았으나 불용성 식이섬유의 함량은 증가하여 총 식이섬유 함량은 증가하였다.

• 펄프종이기술
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• 제48권3호
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• pp.14-22
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• 2016

Pulping is a stage that can change fibrous raw materials into pumpable slurry. Recovered paper can be defibrated to individual fibers by shear stress generated by rotation of a rotor and water. Disintegration of recovered paper is more complicated than that of chemical pulp. When disintegration of recovered paper is poor, screening and cleaning efficiency will be worse and properties of paper will also be deteriorated. Therefore, pulping is an important treatment for improvement of availability of recovered paper and process runnability. In this study, degrees of disintegration of KOCC obtained from a linerboard mill was analyzed with a pilot-scale screen. Flake removal of KOCC slurry was performed by a pilot screen. Simple pumping action gave a positive effect on disintegration of KOCC. After pumping for 10 minutes, paper strength increased without the change of water retention value and fibrillation of KOCC slurry. This phenomena can be explained by modification of hornified surface of KOCC fibers by shear stress generated by pumping. Consequently, disintegration efficiency of KOCC can be enhanced by control of retention time at pulper or an agitation power at chests of papermaking process.