• Journal of Biosystems Engineering
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• 제34권3호
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• pp.175-182
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• 2009

This study was conducted to investigate the drying characteristics of tissue cultured mountain ginseng roots. The far infrared rays dryer of a double blast system used for this experiment can control the drying parameters such as far infrared heater temperature and air velocity. The far infrared rays drying tests of tissue cultured mountain ginseng roots were performed at air velocity of 0.4, 0.6, 0.8 m/s, under drying air temperature of 50, 60, and $70^{circ}C$, respectively. The results were compared with one obtained by the heated air drying method. The drying characteristics such as drying rate, color, energy consumption, saponin components and antioxidant activities were analyzed. The results showed that the drying rate of far infrared rays drying was faster than that of heated air drying and due to high temperature of drying air and fast air velocity, the far infrared rays drying of double blast type was superior to the heated air drying. The value of the color difference for heated air drying was 10.11${\sim}$12.99 and that of far infrared rays drying was in the range of 7.05${\sim}$7.54, which was in the same drying condition, also energy consumption of far infrared rays drying was in the range of 3575${\sim}$6898 kJ/kg-water. At the same time, the antioxidant activities using far infrared rays drying were higher than those using heated air drying.

• 융복합기술연구소 논문집
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• 제13권1호
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• pp.1-6
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• 2023

Fast drying after squeezing has known as important for fabrics such as household towels and dishcloths due to the nature of their use. In this study, drying experiments with time were conducted on various fabrics made of materials widely used in homes using a simple experimental device. Similar to the results of previous experimental studies, it was found that in the case of fabrics of the same material with different weight (or thickness), the drying rate over time was similar. In the case of dimensionless weight and time, which are non-dimensionalized by initial weight and complete drying time, the drying characteristics of the fabrics tested in this study were found to have similar drying rates for each mode at both high and low speeds.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 학술발표대회 논문집
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• pp.96-101
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• 1996

• 한국염색가공학회지
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• 제7권4호
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• pp.33-38
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• 1995

In resist-discharge printing of cotton fabrics with reactive/reactive dyes the effects of intermediate drying on the white and the colored resist-dischargeabilities were studied. From the results of resist-discharge printing in case of 75% pick up, it was found that the most effective condition of intermediate drying which could at once prevent bleeding and improve the resist-dischargeability was 11$0^{\circ}C$ x 1min. The drying condition of 10$0^{\circ}C$ x 2min or 12$0^{\circ}C$ x 1min can be also recommended. It is important to pay close attention to the intermediate drying temperature and time. Because in case of 75% pick up when drying was carried on at 11$0^{\circ}C$ or 12$0^{\circ}C$ for more than 1 minute the resist-dischargeability was greatly lowerd by the fast fixation of ground color caused by high temperature, and in case of 100 % pick up the insufficient drying of ground color caused the resist-dischargeability to lower with giving rise to various troubles such as bleeding and smearing.

• 한국연초학회지
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• 제17권1호
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• pp.68-78
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• 1995

A study of expanding tobacco includes the steps of adjusting the moisture content of cut tobacco, without the use of exogenous impregnants by contacting the filler with a high velocity gaseous medium at elevated temperature such that heat is rapidly and substantially uniformly transferred from the medium to the filler for a total contact time sufficient to expand the tobacco leaves. Study is disclosed for drying and expanding cut tobacco by introducing the tobacco into an elongated tubular shaped conduit through which steam high temperature 150-35$0^{\circ}C$ and high velocity above the 18m1sec, super steam is recycled. moisture content of shreded tobacco leaves, immediately before treatment within the range of from 10% to 24% and, most preferably, within the range of from 18% to 21%. Expanding rate showed 70% in NC -82(B.3) and 42% in Burley -21(B.1) which is produced in 1993 under this condition. When expanding tobacco expanded tobacco did not change significally, but they were decreased at 27$0^{\circ}C$ very largely. The curtailment of cost price and physical and chemical properties of various items were improved in cigarettes. Key words : Expanding tobacco, Super steam tobacco expansion, Fast drying tobacco, High temperature treat tobacco, Puffing tobacco.

• Korea-Australia Rheology Journal
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• 제21권2호
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• pp.83-89
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• 2009

Coating process plays an important role in information technology such as display, battery, chip manufacturing and so on. However, due to complexity of coating material and fast deformation of the coating flow, the process is hard to control and it is difficult to maintain the desired quality of the products. Moreover, it is hard to measure the coating process because of severe processing conditions such as high drying temperature, high deformation coating flow, and sensitivity to the processing variables etc. In this article, the coating process is to be re-illuminated from the rheological perspectives. The practical approach to analyze and quantify the coating process is discussed with respect to coating materials, coating flow and drying process. The ideas on the rheology control of coating materials, pressure and wet thickness control in patch coating process, and stress measurement during drying process will be discussed.

• 한국정밀공학회지
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• 제27권3호
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• pp.95-103
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• 2010

Roll to Roll (R2R) is one of the most promising production technologies in the printed electronics such as OLEDs, e-paper, backplanes, RFID because this technology can save production cost and increase production speed. Printed electronics includes various processes such as printing, drying, winding, unwinding, and so on. In printed electronics R2R system, air-flotation oven is employed for drying process. Therefore, it is essential to introduce efficient and fast drying process when printing is finished. This paper considers the analysis of drying process in R2R that involves hot air flow. Air-flotation oven consists of non-contact supports and drying of coated web materials such as plastic films and paper. In this paper, experimental results and numerical analysis of pressure-pad air bar are investigated. The aerodynamic characteristics of pressure-pad air bar are numerically calculated using computational fluid dynamics (CFD) approach. Then the measured values of the aerodynamic forces for air bars are compared with those of CFD analysis.

• 자원리싸이클링
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• 제6권1호
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• pp.40-46
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• 1997

하수처리에 있어서 오니 처분 문제는 아주 심각하다. 슬러지의 최종처분시 가장 중요한 비중을 차지하는 것은 수분제거하 할 수 있다. 슬러지 건조는 가열에 의해 고.액을 분리하여 재이용, 소각, 처분을 위한 전처리 공정이다. 본 연구의 목적은 초고주파로 하수오니를 건조후, 실험값과 이론값을 비교하기 위하여 수행하였다. 초고주파 건조는 속도가 빠르고 효율이 매우 높다. 건조시 물질전달은 1차원적이라 가정하였다. 건조속도곡선에서, 감율속도기간에서의 수분이동은 확산에 의한다. 두께 0.2cm인 시료에서 모델과 실험결과가 일치함을 알 수 있다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2000년도 추계학술발표강연 및 논문개요집
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• pp.153-153
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• 2000

• Current Research on Agriculture and Life Sciences
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• 제33권2호
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• pp.65-68
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• 2015

Hunter's color value "a" in dried-persimmon of table and full ripe fruit was higher than that in unripe fruit. In case of soluble solid content, full ripe fruit was $50^{\circ}Brix$, the highest degree, while unripe fruit was $40^{\circ}Brix$, the lowest degree. PPO activation of unripe fruit was 4.7, which was higher than table-ripe fruit (0.7) and full ripe (1.0). Polyphenol oxidase activation remained even while drying, but there was no difference in PPO activation degree as drying period increased. Total phenol content of unripe fruit was 101.4, which was higher than table-ripe fruit (57.5) and full ripe fruit (67.4). Total phenol content level increased as drying period increased, which was based on fresh weight. Hardness of unripe and table ripe fruit continued to decrease until three weeks during softening. After that, hardness was high and it started drying. However, in full ripe fruit, hardness increased after two weeks and softening was fast during the drying period, and its weight reduction rate was lower than that of unripe and table ripe fruit.