• Title, Summary, Keyword: autoclave

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Development and Analysis of the Autoclave Alternative Composite Material Molding Process Using a Pressure Device (가압장치를 이용한 오토클레이브 대체 복합재료 성형공정 개발 및 분석)

  • Kim, Jung-Soo;Kim, Byung-Ha;Joe, Chee-Ryong
    • Composites Research
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    • v.27 no.6
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    • pp.254-259
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    • 2014
  • In this study, a device and pressure press process that is able to substitute autoclave process is developed. This process complements disadvantages of autoclave process which are long process-time and high production cost. The developed device provides air pressure as well as the vacuum which are greatest feature of autoclave process. The device is sealed using hydraulic pressure to keep the air pressure inside the mold. The transfer of the heat is designed to be direct. The heating and pressure charging time are decreased by reducing the interior space. Tooling cost is reduced dramatically compared to autoclave process. Spring-back phenomenon is measured and compared. The temperatures of several parts of the mold during molding are measured. The fiber volume fraction of the parts molded by autoclave process and by the developed process are compared.

Fabrication and Evaluation of Integrated Composite Part for Aircraft using OoA (Out-of-Autoclave) Prepreg (OoA (Out-of-Autoclave) 프리프레그를 이용한 항공기용 복합재 일체형 부품 제작 및 평가)

  • Hong, Sungjin;Song, Min-Hwan;Song, Keunil;Baik, Sang-Moon;Shin, Sang-Jun
    • Composites Research
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    • v.29 no.5
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    • pp.315-320
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    • 2016
  • Conventionally, composite aircraft structures are fabricated within autoclave at high pressure. However, autoclave process has several disadvantages including high curing costs and limitation of part size. Recently, out-of-autoclave (OoA) processes have been investigated in many studies to replace conventional autoclave process. A newly developed OoA prepreg, using conventional ovens, can significantly reduce the curing costs and produce autoclave-quality parts. Nevertheless, manufacture of void-free complex shape structure using OoA process presents significant challenges because of the low consolidation pressure. In this study, integrated skin-spar-rib composite part was fabricated using OoA prepreg. And cross-sectional macro- and micro-graphs of the part were examined in order to assess the possibility of replacing conventional autoclave process.

The Characteristics of Brown Stock Prepared by High Pressure Cooking (고압 가열 방식으로 추출한 Brown Stock의 특성)

  • 최수근;최희선;이재성
    • Journal of the East Asian Society of Dietary Life
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    • v.11 no.4
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    • pp.281-288
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    • 2001
  • The autoclave method and the traditional cooking method were compared for nutrients(especially, minerals), color difference, viscosity, reduction of sugar and amino nitrogen content of brown stock. The autoclave cooking method is better than the traditional cooking method for retaining protein and amino nitrogen contents, as well as for reducing sugar content. Also, reducing sugar content increased by the autoclave cooking method. Since the color of brown sauce was related with the reducing sugar content, the autoclave cooking method was more effective than the traditional cooking method for the color development of brown stock. Since the autoclave method can reduce the cooking time without a loss of quality in brown stock, the autoclave method is a viable alternative to the traditional method of preparing brown stock.

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A Study on the Analysis of causes & minimizing of Defects at Composite Materials Sandwich Aircraft Structure in Autoclave Processing (항공기용 복합재료 샌드위치 구조물의 오토클레이브 성형시 발생되는 결함 원인 분석과 그 최소화 방안)

  • 권순철;임철문;최병근;이세원;한중원;김윤해
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.29-33
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    • 2000
  • The purpose of this paper is to determine the effect of the autoclave inner pressure rate, heat-up rate, tool round angle, Thickness of core, height of joggle on defects, and to minimize the defects of aircraft sandwich structure reinforced with honeycomb core occurred in autoclave processing. The results showed that the geometry of aircraft sandwich structure and tool such as tool round angle, Thickness of core, height of joggle, and the autoclave cure conditions such as inner pressure rate, heat up rate strongly affected the core movement, core wrinkle, bridge phenomenon of prepreg and depression of core that occurred in autoclave processing.

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소고기 사골을 재료로 제조한 Brown Stock의 특성

  • Choe, Su-Geun;Lee, Byeong-U
    • Proceedings of the Korea Hospitality Industry Research Society Conference
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    • pp.51-58
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    • 2003
  • The autoclave method and the traditional cooking method are compared for nutrients, mineral, color difference, viscosity, reducing sugar and amino nitrogen content of brown stock. For protein and amino nitrogen contents, the autoclave cooking method is better than the traditional cooking method. Also, reducing sugar content is increased by the autoclave cooking method. Since the color of brown sauce is related with reducing sugar content, the autoclave cooking method is more effective than the traditional cooking method for the color of brown sauce. Since the autoclave method can reduce the cooking time without the loss of quality in brown stock, the traditional method can be substituted by this new method.

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Post-operating Techniques for Non-toping Vulconization Process of Electric Cable Sheath in Autoclave (Autoclave를 이용한 전선피복용 고무의 무테이핑 가황공정시 후처리 운전기술)

  • Kim, Duk-Joon;Choi, Sang-Soon;Kim, Tae-Ho
    • Elastomers and Composites
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    • v.33 no.2
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    • pp.103-109
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    • 1998
  • The determination method of successful operation conditions to control the temperature and pressure in autoclave after non-taping vulcanization process was represented. Heat and mass balances were constructed to predict the mass flow rates of air, steam, and condensed water into or from autoclave when the temperature and pressure in the autoclave were to be controlled in the desired profiles. The balance equations were solved by appropriate mathematics, and the solution was applied to an autoclave system where the temperature and pressure were linearly decreased. The resulting solutions were illustrated in graphs.

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THE EFFECT OF AUTOCLAVE STERILIZATION AND REUSE OF $SMARTPEG^{TM}$ ON THE IMPLANT STABILITY QUOTIENT (ISQ) MEASUREMENT ($Smartpeg^{TM}$의 고압멸균소독 및 재사용이 임플랜트 안정성 지수(ISQ) 측정에 미치는 영향)

  • Kang, In-Ho;Kim, Myung-Joo;Lim, Young-Jun;Kim, Chang-Whe
    • The Journal of Korean Academy of Prosthodontics
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    • v.45 no.5
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    • pp.644-652
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    • 2007
  • Statement of problem: Resonance frequency analysis is evaluated as the non-invasive and objective method for the evaluation of implant stability and has been increasingly used. It is necessary to evaluate the factors affect the ISQ measurement stability. Purpose: This study was performed to evaluate the effect of the autoclave sterilization and reuse of $Smartpeg^{TM}$ on ISQ measurement. Material and methods: $SmartPeg^{TM}$ (Integration Diagnostics Ltd., $G\ddot{o}teborg$, Sweden) of autoclave group (A) was autoclave sterilized 9 times and $Smartpeg^{TM}$ of reuse group (R) was reused 9 times. Ten $SmartPeg^{TM}s$ were allocated to each group and after each autoclave sterilization and reuse, implant stability quotient (ISQ) values were measured 3 times from the two directions a and b at a right angle. $Osstell^{TM}$ mentor (Integration Diagnostics Ltd. $G\ddot{o}teborg$, Sweden) was used and type 1 (article no. 100353) $Smartpeg^{TM}$ was selected according to $Smartpeg^{TM}$ reference list. Osstem Implant US II future (Osstem Co., Seoul, Korea) in $4.0mm{\times}11.5mm$ was embedded in the self-curing acrylic resin ($Orthojet^{(R)}$, Lang Dental, U.S.A.). Data was statistically analyzed by one-way ANOVA $({\alpha}=.05)$ and scheffe test was done where a significant difference exist. Correlation test was also done between ISQ value and the number of autoclave sterilization or reuse. Results: 1. In autoclave group, the means and sd. of ISQ value before autoclave sterilization were $84.97{\pm}0.41,\;84.93{\pm}0.74$ at direction a and b. There was significant differences between autoclave groups at direction a and b (P=.000). 2. In reuse group, the means and sd. of ISQ value before reuse were $85.40{\pm}0.62,\;85.50{\pm}0.57$ at direction a and b. There was no significant difference between reuse groups at direction a and b (P>.05). 3. There was a weak positive correlation between the number of reuse and ISQ value at direction a and b (${\gamma}=.207$ and .246, P<.01). Conclusion: Within the limitations of this study, the following conclusions were drawn. Till ninth reuse of $Smartpeg^{TM}$, the ISQ measurement stability did not be affected. After twice autoclave sterilization of $Smartpeg^{TM}$ the ISQ measurement stability was affected.

Development of Vacuum-Press Curing Equipment for the Substitution of Autoclave (오토클레이브 성형공정을 대체할 수 있는 진공가압식 성형장치 개발)

  • 박희관;윤영기;윤희석
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.39-42
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    • 2001
  • This paper addresses the development of VP curing equipment for the substitution of autoclave which has several limits in application. This equipment adopt vacuuming and pressurizing processes similarly to the autoclave, but has flexible pressurizing and movable system. The experiments were pursued to determine and to compare specific properties of the specimens produced by three kinds of processes; autoclave, hotpress, and VP. The results show that the VP curing equipment can produce the useful composite material with a little inferior quality to the autoclave, but better than the hotpress. Considering the movability of VP curing equipment, it can be expanded its application to the areas of composite patch-repaired structure in large objects.

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The Study on the Surface Properties of Concrete Tile According to the Autoclave Curing (오토클레이브 양생에 따른 콘크리트 마감재의 표면특성에 관한 연구)

  • Choi Sun-Mi;Jung Ji-Yong;Jung Eun-Hye;Kawg Eun-Gu;Kim Jin-man
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.77-80
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    • 2005
  • The surface of concrete tiles is weak in moisture that it occurrenced efflorescence, but in the former study we found that it is possible to ensure moisture stability of concrete surface by autoclaving. So this study is to discuss the moisture stability and Physical Properties of high-strength glossy concrete according to time and temperature of autoclave curing. As the results, by increasing time and temperature of autoclave curing, compressive strength and surface hardness increased and glossiness decreased. In the case to 3 hour and $180^{\circ}C$ of autoclave curing, there is not effloescences in mosture stability test.

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Solubility Study of Nickel Ferrite in Boric Acid Using a Flow-Through Autoclave System under High Temperature and High Pressure

  • Park, Yong Joon;Choi, Ke-Chon;Ha, Yeong-Keong
    • Nuclear Engineering and Technology
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    • v.48 no.2
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    • pp.554-558
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    • 2016
  • The solubility of nickel ferrite in an aqueous solution of boric acid was studied by varying the pH at the temperatures ranging from $25^{\circ}C$ to $320^{\circ}C$. A flow-through autoclave system was specially designed and fabricated to measure the solubility of Fe in hydrothermal solutions under high temperature and pressure. The performance of this flow-through system was directly compared with the conventional static state technique using a batch-type autoclave system. The stability of fluid velocity for the flow-through autoclave system was verified prior to the solubility measurement. The influence of chemical additives, such as boric acid and $H_2$, on the solubility of nickel ferrite was also evaluated.