• Title, Summary, Keyword: 통기성

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Strength Optimization of Ventilating Container(I)-Experimental Analysis (통기성 상자 구조물의 강도적 최적화 연구(I)-실증 분석)

  • Park, Jong-Min
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.7 no.2
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    • pp.19-24
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    • 2001
  • The design criteria of ventilating container is not provided yet in Korea. This caused strength reduction due to the ventilating hole and bad ventilating performance. The purposes of this study were to survey the present situation of ventilating container in Korea, to analyze the strength reduction on the atmosphere condition variation, and to provide the criteria for the optimum design of ventilating container. The ventilating area of container was $1.41{\sim}2.65%$, and strength reduction due to the varied pattern, size and location of ventilating hole was $8.5{\sim}20.2%$. The effect on the strength reduction from the pattern and location of ventilating hole was bigger than that from the ventilating area. Equilibrium arrival time of temperature and relative humidity was shorter as the ventilating area was bigger, and temperature reached to the equilibrium state earlier than the relative humidity. There was no significant difference on the ventilating hole pattern between equilibrium arrival time of temperature and relative humidity and equilibrium arrival temperature and relative humidity if the ventilating area was the same.

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Effects of Growth Regulators and Culture Environment on ex vitro Rooting and Acclimatization of Apple Rootstock in vitro Propagated (기내배양 사과 대목의 기외 삽목 시 발근과 순화에 미치는 배양조건 및 생장조절물질의 효과)

  • Kwon, Soon-Il;Kim, Jeong-Hee;Kang, In-Kyu;Kim, Mok-Jong
    • Journal of Plant Biotechnology
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    • v.31 no.2
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    • pp.133-138
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    • 2004
  • Growth of M.9 (Malus domestica Bark. cv) and M.26 (Malus domestica Bark. cv) of dwarf apple rootstock, cultured on MS agar medium in a vessel with ventilating stopper (VS) and then in vivo rooting and acclimatization under combined-treatment by some materials with IBA, were investigated. Concentration of $CO_2$ and ethylene in the vessel with VS was lower then in the vessel with non-VS. Change of temperature and humidity in the vessel with VS was repeated by light condition. Stomatal pares of tissue in the vessel with VS were immediately closed after plantlets were exposed to room humidity but those in the vessel with non-VS were opened after 20 minutes exposure to room humidity. Leaf area and chloroplast index of tissue in the vessel with VS was higher then in the vessel with non-VS. In vivo rooting ratio and acclimatization ratio of M.9 and M.26 was highest in 300mg/L IBA+3% sucrose dip-treatment among other combined- treatments.

Syntheses and Characterizations of Polymer-Ceramic Composites Having Increased Hydrophilicity, Air-Permeability, and Anti-Fungal Property (친수성, 통기성 및 항균성이 향상된 고분자-세라믹 복합소재의 제조 및 물성)

  • Cho, Hyung-Joon;Jung, Dong-Woon
    • Journal of the Korean Chemical Society
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    • v.54 no.1
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    • pp.137-141
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    • 2010
  • Generally, polymer materials are not air-permeable and hydrophilic. In addition, they do not possess anti-fungal property. Hydrophilicity, air-permeability, and anti-fungal properties of new composites consisting of polymer, ceramic nanoparticles, and silver ion were investigated by contact angle measurements, air permeation time, and cell culture. The hydrophilic, air-permeable, and anti-fungal composites can be used in health care industry.

Heat Shield and Breathable Water-Resistant Design for Manufacturing that are Expressed Multifunctional Building Housewrap (열차폐 및 투습방수성이 발현되는 다기능성 건축용 하우스 랩의 제조설계)

  • Kwon, Oh-Kyung;Kim, Seok-Hoon;Park, Sun-Hwa;Jeong, Won-Wook;Bok, Jin-Seon
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • pp.15-15
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    • 2011
  • 본 연구는 기존의 하우스 랩이 가지는 방풍, 방수 기능 외에 복사열 차단성, 열반사성, 통기성, 투습성, 난연성, 방수성 및 단열성 등의 다기능성이 발현되는 우수한 건축용 하우스 랩을 제조하는 목적으로 시스-코어 섬유로 이루어진 부직포층, 통기성 합성수지 필름층, 니들펀칭 복합 부직포층 및 고분자 필름이 일면 또는 양면에 코팅된 내식성 알루미늄 필름층이 순차적으로 적층되고 핫-멜트 라미네이팅에 의하여 합지 된 다기능성 하우스 랩 및 그의 따른 제조방법에 관한 것이다. 상기 니들펀칭 부직포 내부에 포함 된 아라미드 섬유에 의해 우수한 난연효과를 가지며, 통기성 필름에 의하여 투습방수 기능을 가질 수 있으며, 니들펀칭 부직포층에 다량의 공기가 함유되어 보온성이 우수하고, 내식성 알루미늄 필름층이 가진 빛에 대해 우수한 방사성으로 복사열을 차단하여 단열효과를 나타내는 하우스 랩을 제조하였다.

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A Comparative Study on the Auxiliary Fan Pressure and the Ventilation Efficiency in Large-opening Limestone Mine Airways (대단면 석회석 광산 갱도 내 국부선풍기 승압력 및 통기효과 비교 연구)

  • Park, Dongjun;Kang, Hyeonho;Lee, Changwoo
    • Tunnel and Underground Space
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    • v.27 no.1
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    • pp.1-11
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    • 2017
  • Most of the local limestone mines are developed as large-opening underground mines, while mine ventilation is heavily dependent on the natural ventilation and auxiliary systems, rather than the mechanical ventilation system using main fans. The current auxiliary ventilation system with fan and ducting requires optimization since enhanced deployment of diesel equipment demands higher airflow rate and the associated cost is expected to be too excessive for the local mine operators. This paper aims at optimizing the fan capacity for the working site ventilation through comparing the fan pressure in the mine airway and the ventilation efficiency of an axial-flow fan and a propeller fan developed in this study.

An excellent ventilation and hydrolytic stability Eco-friendly artificial synthetic leather Using Thermoplastic Polyurethane Elastomer (TPU를 이용한 통기성 및 내가수분해성이 우수한 친환경 인조합성피혁에 개발)

  • U, Jong-Hyeong;Han, Dong-Su;Hong, Seong-Gon
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • pp.149-150
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    • 2008
  • 인체에 무해한 친환경 소재인 TPU수지를 인조합성피혁에 채용하여 기존에는 없던 통기성을 부여하였으며 PU 소재의 제품보다 내가수분해성이 뛰어나면서 기본물성이 우수한 고감성 인조합성 피혁 제품을 개발하였다.

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Studies on the aeration improvement of inner bottle culture system during the mycelial culture of Flammulina velutipes (팽나무버섯의 균사배양 중 배양기 내부 통기성 개선)

  • Shim, Kyu-Kwang;Yoo, Young-Jin;Koo, Chang-Duck;Kim, Young-Seok;Kim, Myung-Koon
    • Journal of Mushroom
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    • v.10 no.1
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    • pp.15-20
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    • 2012
  • Ventilation effects of bottles($1,100m{\ell}$) for culturing Flammulina velutipes on its mycelial growth and mushroom production were investigated. The degree of ventilation were controlled with hole positions, upper and under, and hole sizes in the bottle lids. The ventilation effects were measured with the contents of carbon dioxide, free sugars, chitin, moisture in the bottles and with the amount of produced mushrooms from the bottles. Carbon dioxide concentrations within the culturing bottles at exponential mycelial growth period vertex were relatively high in the bottles with lids without both a sponge and an aeration hole, and in those with a smaller hole. Free sugar contents in the mycelia were the highest in those with a 47mm hole on both sides, and in those with 26~33mm holes only underside. Chitin content was the highest in those with a 26mm hole only underside. On the other hand, the lids with 42mm~47mm holes on the both sides greatly lost water and decreased the mushroom production. In conclusion, the most efficient ventilation hole sizes on the lids for bottle($1,100m{\ell}$) cultivation of Flammulina velutipes using $1,100m{\ell}$ polypropylene bottle were 19mm on both sides of the lid and 26mm on only underside. They produced more mushrooms than the control by 6~9 %.