• Title, Summary, Keyword: Drying process

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A study on the drying characteristics of conductive ink by infrared drying system and the hot-air drying system (적외선 건조 및 열풍 건조에 대한 전도성 잉크의 건조 특성에 관한 연구)

  • Jung, Gil-Yong;Lee, Jai-Hyo;Hong, Seung-Chan
    • Proceedings of the SAREK Conference
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    • pp.183-188
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    • 2009
  • RFID method is a non-contact automatic identification technology, which attaches microchips and antennas to an object in a tag form, to send and process information sent to the network using wireless frequency. Drying and curing process is extremely important which minimizes the resistivity of RFID antennas. This research is about the drying characteristic of conductivity ink, and analyzes and compares the hot-air drying process and infrared drying process. Also, the research was done for the improvement in drying performance by using combined process of hot-air and infrared mechanism. The experiment result shows that the hot-air or infrared drying system used alone cannot meet the required performance in drying printing method using conductivity ink. The combined drying system of hot-air and infrared ray showed resistance low enough in short drying and curing time, and this mechanism makes drying and curing process for mass and continuous production possible on-line.

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A Study on the Heat and Mass Transfer Characteristics of Vacuum Freeze Drying Process for Porous Media (다공성 물길의 진공동결건조과정에서 얼 및 물질전달 특성에 관한 연구)

  • c. s. song
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.6
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    • pp.1341-1352
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    • 2001
  • Vacuum freeze drying process by which frozen water in a drying material is removed sublimation under vacuum condition, is now applied to various industrial field such as the manufacturing and packaging of pharmaceuticals in pharmaceutical industry, the drying of bio- products in bio-technology industry, the treatment of various quality food stuff in food technology, and so on. The Knowledge about the heat and mass transfer characteristics related with the vacuum freeze drying process is crucial to improve the efficiency of the process as well as the quality of dried products. In spite of increasing needs for understanding of the process, the research efforts in this fields are still insufficient. In this paper, a numerical code that can predict primary drying in a vial is developed based on the finite volume method with a moving grid system. The calculation program can handle the axis- symmetric and multi-dimensional characteristics of heat and mass transfer of the vial freeze drying process. To demonstrated the usefulness of the present analysis, a practical freeze drying of skim Milk solution in a vial is simulated and various calculation results are presented.

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A study on intelligent fish-drying process control system

  • Nakamura, Makoto;Shiragami, Teizoh;Sakai, Yoshiro
    • 제어로봇시스템학회:학술대회논문집
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    • pp.132-137
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    • 1993
  • In this paper, a fish drying process control system is proposed, which predicts the proper change with time in weight of the material fish and the drying conditions in advance, based on the performance of skilled worker. In order to implement a human expertise into an automated fish drying process control system, an experimental analysis is made and a model for the process is built. The proposed system divided into two procedures: The procedure before drying and the one during drying. The procedure before drying is for the prediction of necessary drying time. To estimate the necessary drying time, first, the proper change in weight for the product is obtained by using fuzzy reasoning. The condition part of the production rule consists of the factors of fish body and the expected degree of dryness. Kext, the necessary drying time is obtained by regression models. The variables employed in the models are the factors, inferred change in weight and drying conditions. The model for the procedure during drying is also proposed for more accurate estimation, which is described by a system of linear-differential equations.

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Development of a General Drying Model of Red Pepper (고추의 범용(汎用) 건조모형(乾燥模型) 개발(開發)에 관한 연구(硏究))

  • Cho, Y.J.;Koh, H.K.;Park, J.B.
    • Journal of Biosystems Engineering
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    • v.16 no.1
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    • pp.60-82
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    • 1991
  • Drying process of red pepper is very important in terms of drying cost and quality of the end product. Recently, many studies on red pepper drying have been performed. Nevertheless, an optimum drying condition is not established yet. Drying characteristics of red pepper is much affected by drying factors such as variety and initial state of red pepper as well as by environmental drying factors such as temperature and relative humidity of drying air. Various varieties of red pepper are being cultivated and the initial state of red pepper at harvest is very ambiguous. For this reason, it is very costly and time-consuming to establish an optimum drying condition of red pepper by experiment. A general drying model to descirbe a drying process has not been developed due to diversity of drying characteristics of red pepper. This study was, therefore, performed to develop a general drying model describing a drying process of red pepper. The results from this study are summarized as follows. 1. A basic model was established to develop an appropriate mositure content model and temperature model describing a drying process of red pepper, and the basic model was validated with experimental data. 2. The bone dry weight of fruit and mositure content were accepted satisfactorily as parameter to define the arbitrary red pepper. 3. The equilibrium moisture content of red pepper was found out to be different according to the variety of red pepper, air temperature and relative humidity. Also, the EMC model was developed using the parameters of air temperature, relative humidity and bone dry weight of fruit. 4. A general drying model for red pepper was developed, parameters of which were expressed as the function of drying factors related with drying phenomena. The developed drying model was found out to describe well the drying process of red pepper.

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Drying Characteristics of Succinic acid using the Microwave (마이크로파를 이용한 호박산 건조 특성)

  • Kim, Ji Sun;Ryu, Young Bok;Kim, Myung Hwan;Hong, Seong-Soo;Lee, Man Sig
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.11
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    • pp.6023-6028
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    • 2013
  • Recently, biodegradable polymers are gaining more and more attention due to international environmental issues. Succinic acid is synthesised by chemical process of hydrogenation. Succinic acid synthesized has certain amount water content. To remove the water contained in succinic acid is used generally by hot air drying process. But recently, microwave drying process having the advantage of shortening the drying time and uniform drying of product are gaining more attention. In this study, hot air drying and microwave drying efficiency were compared at drying process. In addition, we confirmed commercial applicability in microwave drying process of succinic acid. Microwave drying process has higher efficiency than 70% compared with hot air drying process at thickness of 1cm. Economic efficiency were compared through examination of power consumption for complete drying of succinic acid at microwave and hot air dyring.

Online Real-Time Monitoring of Moisture in Pharmaceutical Granules During Fluidized Bed Drying Using Near-Infrared Spectroscopy (근적외분광분석법을 이용한 의약품 건조공정 중 실시간 수분함량 모니터링)

  • Kim, Jaejin;Kim, Byung-Suk;Lim, Young-Il;Woo, Young-Ah
    • YAKHAK HOEJI
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    • v.60 no.2
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    • pp.85-91
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    • 2016
  • Drying of granules for tablet formulation is one of the important unit operations. The loss on drying method is traditionally used for this purpose. However, it is a time-consuming method, requiring at least 1 h. Moreover, it is ineffective in monitoring the moisture content of granules during the drying process. In this study, online real-time monitoring of moisture content during the drying process was successfully performed using near-infrared (NIR) spectroscopy. NIR spectra were collected during 15 different drying batches for developing a reliable NIR spectroscopic method. Such a large number of batches were used to develop a more robust partial least squares (PLS) model. NIR spectra collected from 12 batches were used for developing the model that was validated by predicting the moisture content of the samples in the remaining 3 batches. The standard errors of predictions (SEPs) in the measurement of batch 1, batch 2, and batch 3 were 0.52%, 0.57%, and 0.56%, respectively. The online NIR spectroscopic method developed in this study was reliable and accurate in monitoring the moisture content during the drying process.

Effect of Stem Drying Method during Curing Process on Physico-chemical Properties in Bulk Cured Leaves (Bulk건조에서 주맥건조방법이 잎담배 이화학성에 미치는 영향)

  • 이철환;이병철;진정의
    • Journal of the Korean Society of Tobacco Science
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    • v.22 no.2
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    • pp.133-137
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    • 2000
  • The bulk curing experiment to improve the quality of flue-cured leaves were carried out to evaluate relationship between the modified(3 step-up) drying and conventional drying method in bulk curing process. Modified drying method was somewhat higher values in yellowing color index of cured leaves, and less brittle than those in conventional drying program. As to the chemical properties, there was no difference in chemical component levels in cured leaves between the modified and the conventional methods, while the major chemical compounds in relation to aromatic essential oil of cured leaves showed mostly higher level in the modified method than that in conventional drying method. Additionally 3 step-up drying method increased the tobacco quality by 2 % in price per kg compared with conventional drying method.

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Efficient Utilization of Energy in Drying Process for Rewetted Red Pepper -Hot-air-convective and Infrared-radiant Drying- (건고추의 재건조 공정에서 에너지의 효율적 이용 -열풍 대류 및 적외선 복사 건조)

  • Koh, H.K.;Cho, Y.J.;Park, J.B.;Kim, Y.H.;Kang, S.W.
    • Journal of Biosystems Engineering
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    • v.14 no.4
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    • pp.262-271
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    • 1989
  • Red pepper is one of the most important agricultural products in Korea. Generally, raw red pepper is dried after harvest and the dried red pepper is powdered. Washing process is necessary to produce clean powder before powdering process. This study, therefore, was performed to analyze the drying characteristics of the rewetted red pepper and the energy utility during hot-air-convective and infrared-radiant drying. Drying effectiveness, De, was defined for the analysis of energy utility in this study, and its value was determined according to the energy source. Infrared-radiant drying was more favorable than convective drying according to drying effectiveness. But the temperature variation was appeared between the radiant surface and opposite surface of red pepper in infrared-radiant drying.

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An experimental analysis and expertise for a fish-drying process control

  • Sakai, Y.;Nakamura, M.;Shiragami, T.;Kochi, M.
    • 제어로봇시스템학회:학술대회논문집
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    • pp.118-123
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    • 1992
  • Analysis is made for a fish-drying process control in order to implement a human expertise into an automated fish drying system. Together with the idea described in the companion paper, a methodology is found effective in a general drying system other than fish drying.

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Simulation of Drying Grain with Natural Air (곡물의 상온통풍건조 시스템의 시뮬레이션)

  • 금동혁;최재갑;고학균
    • Journal of Biosystems Engineering
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    • v.4 no.2
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    • pp.32-45
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    • 1979
  • The major objective of this study was to develope a computer simulation model to analyze drying process in a deep bed with natural air. The approach used to describe the continuous drying process in a deep bed was to divide the process into many small processes and simulate them by consecutively calculating the changes of grain and air conditions that occurred during short increment of time. Success criterion of the drying system was based on grain deterioration estimated by drymatter decomposition during drying. The results of the experimental test showed that the model satisfactory.

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