• Title/Summary/Keyword: pre-drying

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Improvement of System for Grain Drying, Storing , and Processing in Rural Area (농촌의 주곡 건조.저장.가공 작업체계 개선확립)

  • 서상용;이승규;김용환
    • Journal of Biosystems Engineering
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    • v.3 no.1
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    • pp.33-46
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    • 1978
  • To get the goal of self-supply of food grain, improvement of post-harvest grain operations in rural area is under consideration as an important task of agriculture in Korea. This is study is focused on elimination of losses and deteriorations of grain and reduction of labour requirements and funds for post-harvest grain operations. The purpose of this study are presentation of basic data referring to conventional post-harvest grain operations in rural area and suggestion of improving methods for the operations, and also finding out reasonable operating processes of the operations. The result of this study are follows; 1. Grain drying in-the-filed which is performed before threshing has major factors of grain loss during drying, and so should be restrained as possible. Combine harvesting system is recommended among other king of mechanized harvesting systems for restraining in-the-field drying and securing available labors for drying. 2. It is predicted that mechanical grain drying could be prevalent when combine harvesting is taken place. Recommended grain drier for pre-combine harvesting system and for combine harvesting system is batch-type drier and circulating -type drier, respectively. 3. As existing farm storages for grain have insufficient spaces and offer poor conditions for grain storing , it is greatly needed to build up new storage which store only grains. And it is concluded that storing grain in community common storages in desirable. 4. Power supplying system for milling machinery in local milling plants, that a large capacity prime mover supplies power to 4 to 6 kinds of milling machinery simultaeously, should be converted to a system of several small capacity prime movers supplying power to each machiner y for the purpose of reducing extra consumption of energy. 5. Governmental grain, of which Korean farms produced, should be milled and stored in the local milling plant successively for the purpose of reducing transportation fee and stroing facilities. 6. Furture post-havest grain operations-drying, storing and milling should be periormed successively in he community common plant. And average optimum processing capacity of the plant is estimated about 300 metric ton of grain every year.

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Ethanol-pretreated Drying of (+)-dihydromyricetin for Removal of Residual Solvents (잔류 용매 제거를 위한 (+)-dihydromyricetin의 에탄올 전처리 건조)

  • Lee, Hee-Gun;Kim, Jin-Hyun
    • Korean Chemical Engineering Research
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    • v.60 no.2
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    • pp.237-242
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    • 2022
  • In this study, a drying method that can effectively remove residual solvent from (+)-dihydromyricetin was developed. Residual acetone concentration was efficiently removed below ICH-specified value (5,000 ppm) by simple rotary evaporation with ethanol pretreatment. In addition, the residual ethanol met the ICH-specified value (5,000 ppm) by simple rotary evaporation through the addition of water, and the residual moisture also met the specified value (<4%) for active pharmaceutical ingredients. At all the drying temperature (35, 45, and 55 ℃), a large amount of the residual solvent was initially removed during the drying, and the drying efficiency increased when increasing the drying temperature. Removal of residual solvent by ethanol pretreatment was shown to be related to high vapor pressure of acetone-ethanol mixture and hydrogen bonding between acetone and ethanol.

Drying Characteristics of Osmotically Pre-treated Carrots (삼투처리한 당근의 건조 특성)

  • Youn, Kwang-Sup;Choi, Yong-Hee
    • Korean Journal of Food Science and Technology
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    • v.28 no.6
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    • pp.1126-1134
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    • 1996
  • The physical characteristics changes of carrots during drying were studied to minimize the quality degradation by applying improved drying process and pretreatment method. Physico-chemical properties of the product were analyzed, and then, drying mechanisms were explained by diffusion coefficients and drying models. In hot air drying process, the drying and rehydration efficiencies were high at low relative humidity and high temperature. Browning degree and specific volume also showed similar trend to drying efficiency. Diffusion coefficient, which describes moisture transfer, was also high at low relative humidity and at high temperature. It was verified using. Arrhenius equation that drying process was influenced by temperature. It was also observed during experiment that temperature changes were more effective in drying than relative humidity changes. Quadratic model was the most fittable in explaining the process. As a result of analyzing the experimental data with respect to the drying time, the contents of carotene and moisture could be modeled as a polynomial. As the air velocity increased, drying performance and rehydration efficiency increased.

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A Study on Solderability by Lasting time of PCB in Pre-Baking (기판의 건조시간에 따른 Solderability에 관한 연구)

  • 신규현;최명기;정재필;서창제
    • Journal of the Microelectronics and Packaging Society
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    • v.6 no.1
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    • pp.59-64
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    • 1999
  • This paper investigated optimum drying time of PCB and the relationship between humidity in PCB and solderability. As experimental results, soldering was improved with increasing drying time. The wetting time of a dry specimen was shorter about 0.2 seconds than that of a wet specimen. The wetting force was Increased by 2~4mN after drying the wet specimen. When PCB was dried over 30 minute, solder defects and tensile strength of soldered joints was optimized. Effects of drying tome of PCB on the soldering, wetting curve, soldered shape, solder ball, and tensile strength, were investigated.

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Multi-scale simulation of drying process fey porous materials using molecular dynamics (part 3: multi-scale simulation) (분자동역학을 이용한 다공성 물질 건조공정 멀티스케일 시뮬레이션(3부: 멀티스케일 시뮬레이션))

  • Baik S.M.;Keum Y.T.
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.15 no.4
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    • pp.168-174
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    • 2005
  • In this study, the numerical simulation of drying processes for porous materials is performed by employing the hierarchical multi-scale modeling and the nano-scale material properties obtained from the molecular dynamics simulation. The multi-scale simulation system is set up using pre- and post-processors and the drying process of electric porous ceramic insulator is simulated. The temperature, moisture, residual stress, and displacement distributions are compared with those based on homogenized properties.

Fast and Easy Drying Method for the Preparation of Activated [18F]Fluoride Using Polymer Cartridge

  • Seo, Jai-Woong;Lee, Byoung-Se;Lee, Sang-Ju;Oh, Seung-Jun;Chi, Dae-Yoon
    • Bulletin of the Korean Chemical Society
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    • v.32 no.1
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    • pp.71-76
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    • 2011
  • An efficient nucleophilic [$^{18}F$]fluorination has been studied to reduce byproducts and preparation time. Instead of conventional aqueous solution of $K_2CO_3-K_{222}$, several organic solution containing inert organic salts were used to release [$^{18}F$]fluoride ion and anion bases captured in the polymer cartridge, concluding that methanol solution is the best choice. Comparing to azeotropic drying process, one min was sufficient to remove methanol completely, resulting in about 10% radioactivity saving by reducing drying time. The polymer cartridge, Chromafix$^{(R)}$ (PS-$HCO_3$) was pretreated with several anion bases to displace pre-loaded bicarbonate base. Phosphate bases showed better results than carbonate bases in terms of lower basicity. tert-Butanol solvent used as a reaction media played another critical role in nucleophilic [18F]fluorination by suppressing eliminated side product. Consequent [$^{18}F$]fluorination under the present condition afforded fast preparation of reaction solution and high radiochemical yields (98% radio-TLC, 84% RCY) with 94% of precursor remained.

Humidity Controlled Drying for the Fragments of an Wooden Boat in the Neolithic Age, Excavated from Bibong-ri, Changnyeong, Korea (창녕 비봉리 출토 신석기시대 나무배 편의 조습건조)

  • Kim, Soochul;Lee, Kwanghee
    • Conservation Science in Museum
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    • v.14
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    • pp.7-12
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    • 2013
  • The conservation has been conducted for the fragments of an wooden boat in the Neolithic Age, excavated from Bibong-ri, Changnyeong, Korea. The vacuum-freeze drying have been applied to mostly to the small relics, such as wooden lacquerwares or small wooden goods etc.. Therefore, the large objects like a wooden boats have been treated almost by air-drying after impregnation with aqueous PEG solution. The air-drying is needed to impregnate with PEG aqueous solution during long period and run the risk of the fault generation. This report explain an example adapted for the fragments of the wooden boat by humidity-controlled drying(HCD) with slow adjusting moisture content. We did the chemical pre-treatment, PEG aqueous solution. The concentration of the aqueous solution was increased gradually from 10% to 80%. After the impregnation, the objects were dried by the HCD. The dimensional stability of the fragments after treatment was good.

Drying Rate and Physicochemical Characteristics of Dried Ginseng Root at Different Temperature (열풍건조온도에 따른 수삼건조속도 및 건조수삼의 이화학적 특성)

  • 하대철;이종원;도재호;박채규;류기형
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.33 no.4
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    • pp.741-746
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    • 2004
  • Drying of raw ginseng root down to 35% moisture content required for extrusion process. There were two kinds of pre-treatments of raw ginseng root which were chopping and whole-root ginseng before frying at 80, 100 and 12$0^{\circ}C$. Drying rate and physicochemical properties of dried ginseng were evaluated to determine optimum drying temperature for extrusion process. Drying time at 8$0^{\circ}C$ to decrease to 35% moisture was 6.5 hr and ginsenoside content in dried ginseng at 8$0^{\circ}C$ was lower than that of dried ginseng at 100 and 12$0^{\circ}C$. Drying time at 100 and 12$0^{\circ}C$ to decrease to 35% moisture was 5.5 and 3.5 hr and redness of dried ginseng powder was 5.20 and 7.23 respectively. Browness and redness of dried ginseng extract from 75% ethylene were significantly increased with the increase in drying temperature. Ginsenosides Rb1, Rb2, Rc, Rd, Rg1 and total saponin were also increased with the increase in drying temperature from 8$0^{\circ}C$ to 10$0^{\circ}C$, however, those were not significantly different with drying temperature at 100 and 12$0^{\circ}C$. Drying temperature for extrusion process can be optimal at 10$0^{\circ}C$.

Physicochemical Properties and Antioxidant Activities in Infrared Dried Peach Processed by Different Pretreatment (전처리조건에 따른 적외선건조 복숭아의 이화학적 특성 및 항산화효과)

  • Kim, Jae-Won;Youn, Kwang-Sup
    • Food Science and Preservation
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    • v.19 no.6
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    • pp.849-857
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    • 2012
  • This study was conducted to determine the effects of the pretreatment and infrared drying methods on the physicochemical properties and antioxidant activities of dried peaches. The pretreatment methods were the 30 min treatment of NaCl, vitamin C, and soluble Ca (1:5 w/v immersion ratio), and leaving them untreated before infrared drying at $55^{\circ}C$ for 20 hr. The moisture content was lower in the pre-treated group and was significantly lowest in the 0.3% NaCl. The titratable acidity and soluble solid content and acid ratio (SS/TA) were high for the vitamin C and soluble Ca groups. The browning degree and cutting strength of the dried peach were lower in the pre-treated group. The total sugar content in the 0.3% NaCl group was significantly higher than those in the vitamin C and soluble Ca groups. The Ca contents were more effective in the soluble Ca treated group and increased with higher Ca concentration. The sensory evaluation results indicated that the organoleptic scores for the overall preference were higher in the 0.1% vitamin C treated group. The phenolic compounds and ABTS radical scavenging ability were high for the 0.1% vitamin C and 0.1% soluble Ca treated groups. These results suggest that pretreatment affected the qualities of the dried peaches, showing that infrared drying can be applied to the production of high quality dried peach products.