• Title, Summary, Keyword: Airtight

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Quality Changes of Pine Nuts(Pinus koraiensis) Stored in Airtight Container and Zipper Bag (밀폐용기와 지퍼백에 저장한 잣(Pinus koraiensis)의 품질변화 연구)

  • Kim, Seong-Soo;Park, Ji-Young;Park, Su-Il;Lee, Youn-Suk;Kim, Jai-Neung
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.14 no.2
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    • pp.57-63
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    • 2008
  • The effects of airtight containers and zipper bags on the freshness extension of pine nuts (Pinus koraiensis) were studied at 4 and $25^{\circ}C$. Changes in total microbial growth, 2-thiobarbituric acid(TBA), color, and sensory quality were evaluated during storage. Total bacterial counts of the samples continuously increased over 28 days for airtight containers and 56 days for zipper bags, and then decreased at 70 days because the lack of air could affect the inhibition of the aerobic microbial growth. However no significant differences were observed between airtight containers and zipper bags. TBA values continuously increased with storage time, but there were no significant differences between the airtight containers and zipper bags during storage. Color changes and sensory evaluation analyses showed that the data revealed similar results for both packaging systems over the storage time. Therefore, it has been concluded that airtight containers and zipper bags could be used as a good packaging system to extend the shelf life of pine nuts by controlling the microbial growth, but the packaging systems of the airtight containers and the zipper bags was not significantly affect the quality parameters for 2-thiobarbituric acid(TBA), color, and sensory quality.

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Effect of Air Controlled Fermentation on Kimchi Quality (밀폐용기에서의 김치숙성에 관한 연구)

  • 김미경;김소연;우철주;김순동
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.23 no.2
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    • pp.268-273
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    • 1994
  • The quality of Kimchi was investigated under airtight and ventilating conditions. At 2$0^{\circ}C$ and 4$^{\circ}C$ fermentation, there were no significantly difference in pH, acidity and vitamin C of Kimchi between airtight and ventilating conditions. The contents of $CO_2$ , the number of lactic acid bacteria and the sensory score of carbonated taste under airtight condition were higher than those values under ventilating condition. While , the number of aerobic bacteria under airtight condition was lower than those under ventilating condition.

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Airtight Storage Characteristics of Rough Rice (벼의 공기 밀폐저장 특성)

  • Keum, D. H.;Kim, H.;Kim, D. C.
    • Journal of Biosystems Engineering
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    • v.25 no.1
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    • pp.33-38
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    • 2000
  • This study was performed to investigate airtight storage characteristics of rough rice using airtight flexible pve container. A storage test of rough rice of 4 tonnes was carried out to determine the changes of gas composition of air in the container, grain moisture content, air temperature and relative humidity , the presence of insects ,germination rate, crack ratio , fat acidity , 1000-kernel weight, and brown rice recovery over storage period of 5 months in Suwon. Concentration of oxygen was decreased from 20% to 16% and carbon dioxide was increased of from 0.03% to 1.6%. The grain moisture content was decreased from 14.4%(w.b) to 14.1%(w.b) for 5 months storage period . Insect population levels were low but these increased after 5 months storage. Most of insects were dead, Fat acidity increased from 7.5(mg KOH/100g) to 10.2(mg KOH/100g). Other storage factors such as germination rate, brown rice recovery and 1000-kernel , and 1000-kernel weight slightly decreased and crack ratio was slightly increased. Qualities of rough rice during 5 months storage period under hemetic air conditions were maintained fairly good considering the above changes of quality factors during storage.

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A Study on the Decrease of Pressure in Truck Cabin With Closing Door (도어 닫힘에 따른 차실내압 저감에 관한 연구)

  • Kim N. H.;Rho B. J.;Kim W. T.;Namkung J. W.;Lee S. J.
    • Proceedings of the KSME Conference
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    • pp.667-670
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    • 2002
  • Vehicle's airtight integrity is a very important factor that greatly affects passenger's habitability. However, when a door is closed, the pressure in the passenger compartment increases due to the vehicle's airtight integrity. That pressurizes the eardrums of the passenger, and makes passenger unpleasant. Thus, in this study, the configurations of air ventilation hasve been investigated to reduce pressure in the passenger compartment. Truck cab is utilized to measure the pressure in the passenger compartment. Various kinds of air ventilations are considered to find out optimized pressure in truck cab when a door is closed.

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Organoleptic Quality of White Ginseng Powder as Influenced by Different Conditions of Decontamination and Storage (백삼분말의 살균 및 저장조건에 따른 관능적 품질 특성)

  • 권중호;변명우
    • Korean Journal of Food Preservation
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    • v.2 no.1
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    • pp.163-171
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    • 1995
  • Organoleptic qualities were evaluated putting emphasis on flavor and color of white ginseng powders which were treated with ethylene oxide(EO) and gamma radiation(5, 10kGy) for microbial decontaminations. Immediately after treatments, there was no significant changes in the overall flavor and color of the samples between the nontreated control and both treatments. The color of even airtight-packaged samples, however, was changed(p<0.05) after 7 months of storage at 30$\pm$2$^{\circ}C$ when treated with EO and 10 kGy. These changes in color were confirmed by the instrumental determinations for the stored samples. Thus, it can be proposed that gamma Irradiation below 10kGy combined with airtight packaging is required for keeping the organoleptic quality of white ginseng powders for more than 6 months of storage.

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Sintering Processing of Compressor Flanges

  • Park, J.K.;Park, H.S.;Choi, S.T.
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • pp.395-396
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    • 2006
  • To manufacture a flange for a compressor with a relief groove by using powder metallurgy in order to prevent deformation to the compressor in operation, powder material for the flange is charged into a mold; an ablative member having a melting point lower than that of the powder material is positioned at a place where a relief groove is to be formed; the flange is formed by compressing the powder material and the ablative member; and the formed flange is sintered at a temperature between the melting point of the powder material and the ablative member so as to melt and remove the ablative member. It made according to the new method has more excellent strength and airtight property than the conventional one. It is analyzed that the ablative member is melted and penetrated into the flange structure during the sintering process, which results in improvement of the airtight property and increase of the strength.

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Development of the Manufacturing System for Thermal Insulated Stainless Steel Door Set (스테인리스 단열도어 세트 제조장치 개발)

  • Lee, Tae-Yeon;Shin, Joon
    • Journal of the Korean Society of Mechanical Technology
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    • v.19 no.5
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    • pp.729-734
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    • 2017
  • There is a need for the development of insulation products with excellent insulation performance and durable insulation for building components. Various policies has been trying to improve the energy efficiency of buildings. The development of energy-saving building materials is also evolving as the energy saving of buildings becomes a main trend. In public and commercial buildings, reliability and beauty are emphasized with respect to the safety of buildings. The purpose of this study was to develop a manufacturing equipment and technology for the development of high airtight stainless steel insulation doors that can meet energy saving design standards of buildings.

The measurement study on the airtightness of dwellings based on the passive design (패시브 디자인을 적용한 주택의 기밀성에 관한 실측 사례 연구)

  • Lee, Tae-Goo;Yun, Doo-Young
    • KIEAE Journal
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    • v.13 no.2
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    • pp.13-20
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    • 2013
  • Today, the world energy consumption in buildings occupies more than 30%. In our country, the energy consumption in buildings also occupies 25% of the entire national energy consumption. With the increasing demand of energy saving in architectural fields, there is a more interest in low-energy construction. For these low-energy housings, our country is planning to apply the energy-saving design standards at the level of passive houses in 2017. However, there is still a limitation in energy saving only with the standards on the performance of envelope in buildings. This means that unless a building is airtight even though it was well-insulated, cooling and heating energy consumption will increase due to the infiltration and leakage. Therefore, this study aims to make a comparative analysis of airtight performance by conducting a blower door test on the housings applied with passive designs, analyze the reasons why most houses fall short of the airtightness standards, and complement the airtightness problems in the inadequate parts of the buildings in order to save building energy.

A Study on Fire Analysis According to Temperature Characteristics of an Incandescent Electric Lamp at 220V/100W (220V/100W 백열전구의 온도특성에 따른 화재분석에 관한 연구)

  • Shong, Kil-Mok;Han, Woon-Ki;Kim, Young-Seok;Choi, Chung-Seog
    • Fire Science and Engineering
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    • v.20 no.1
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    • pp.43-49
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    • 2006
  • In this paper, we are studied on the temperature characteristics and fire progress of an incandescent electric lamp at 220V/100W. In the case of stationary state, the ignition possibility of the incandescent electric lamp due to the heat generation was low because the temperature was measured at $161.9^{\circ}C$ the temperature was increased at $538.1^{\circ}C$ in the airtight chamber, but it does not generated the fire because the oxygen was not exist in the airtight chamber. When the lamp is broken, the filament of lamp was melted in the air. The gas of lamp interior spurted to the weakest part by external flame. Thus, the incandescent electric lamp is high possibility of fire when oxygens from airtight space. Also, it is known that the possibility of ignition is very high if combustion materials(sawdust) exists on surrounding. These experimental results will be utilized for the data in the investigation electrical fire cause.