• 제목/요약/키워드: plywood

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A Study on the Degree of Surface-Glossing of Exposed Concrete with the Kinds of Form Materials and Form Oils (거푸집 및 빅리제 종류에 따른 제치장 콘크리트의 광택도에 관한 연구)

  • 김효구;강의영;오선교;한천구;반호용
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.04a
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    • pp.197-202
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    • 1999
  • The properties of surface-glossing of exposed concrete with the kinds of form materials and form oil are investigated under various slump value. According to the experimental results, surface-glossing has high value with the increase of slump. In case of surface-glossing with the kind of the form, the form made of acryl has the best performance among the form kinds tested in this experiment. The order of surface-glossing is follows ; fancy plywood > metal form > plywood. Water solution type form oil has better performance in surface-glossing than oil solution type form oil. Also, surface-glossing get worse with the elapse of age.

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Vibration Transmission of Railway Floor Structure due to Connecting Materials (연결재료에 따른 철도차량 바닥구조의 진동전달)

  • Shin, Bum-Sik;Chun, Kwang-Wook;Choi, Yeon-Sun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.11
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    • pp.1320-1325
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    • 2009
  • The sources of the vibration of railway vehicles in the cabin are usually bogie, axle, and wheel. The vibrations are transmitted through the floor structures of railway vehicle. The floor structure is the combination of bottom plate, plywood, and rubber. In this research the vibration transmission is measured experimentally and analyzed numerically to find the transmission characteristics of the vehicle floor structures. The result shows that the vibration characteristic of soft rubber is better than hard rubber or wood as the connecting material between the bottom plate and the plywood.

A Study on the Transmission Path and Vibrosolating Character of Shipboard Structure-borne noise (SEA법에 의한 선박고체소음의 전파경로와 방진특성에 관한 연구)

  • 김사수;현명환;이도경;권종현;안시영
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1995.04a
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    • pp.223-230
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    • 1995
  • 본 연구에서는 선박소음해석을 수행하기 위한 기초작업으로서 실선 선박모델을 크게 3가지 경우로 구분하여 모델링 하였으며, SEA법을 적용하여 고체소음의 전달손실을 이론적으로 예측할 수 있는 방법을 제시하였으며, 또한 STL을 도입하여 각 요소간의 에너지 흐름 및 구성판요소의 재료별 방진효과를 알아보았다. 이 방법의 결과 다음과 같은 결론을 얻을 수 있었다. 1) 내장판의 종류에 따른 전달특성은 고주파 대역에서는 plywood, 저주파 대 역에서는 rockwool이 높은 손실값을 보였으며, glasswool은 전 주파수 대역에서 고른 손실값을 가짐을 확인하였다. 2) 기진원으로부터의 거리가 멀어짐에 따라 내장판의 효과가 크게 나타나며, 기진원의 근방 요소에서는 내장판의 효과보다는 강판의 두께의 영향이 두드 러짐을 알 수 있었다. 3) 내장판 요소중 plywood의 방진효과가 가장 크게 나타남을 알 수 있었다. 4) 본 SEA법에 의한 연구에서는 구성 판요소의 재질과 두께에 따른 고쳇음 의 전달특성을 이론적으로 해석하였으며, 차후 실험을 통한 검증이 요구되어 진다.

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Effect of Wood Material Type on Biocide Retention and Distribution Using Supercritical Fluid Impregnation

  • Kang, Sung-Mo;Jung, Doo-Jin;Koo, Ja-Oon;Morrell, J.J.
    • Journal of the Korean Wood Science and Technology
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    • v.33 no.5 s.133
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    • pp.50-56
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    • 2005
  • The effect of wood material type on biocide retention and distribution during supercritical fluid impregnation was assessed using three different wood types including solid wood, plywood and oriented strand board (OSB). The result revealed that biocide treatability differed with structural composition and permeability of the various materials. Low treatability of plywood might be attributed to interferences of glue line limiting fluid movement. OSB samples showed higher biocide retentions, resulting from the presence of interconnecting gaps permitting more open flow.

Influence of Mix Proportions and Form Types on the Surface-Glossing of Flowing Concrete (유동화 콘크리트의 표면 광택도에 미치는 배합 및 거푸집 요인의 영향)

  • 한천구;김효구;오선교;반호용
    • Journal of the Korea Concrete Institute
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    • v.12 no.4
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    • pp.15-22
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    • 2000
  • The objective of this study is to investigate the degree of surface-glossing of flowing concrete, varying with W/C, types of forms and form oils. According to the experimental results, the degree of surface-glossing of flowing concrete is turned out to be higher than that of base concrete, as the slump increases. The degree of surface-glossing of concrete with 40% of W/C is higher than that with 50%. The orders of degree of surface-glossing with the types of forms are as follows : acryle > fancy plywood > metal form > plywood. When water solution type form oil is applied to the surface of forms, we can achieve higher degree of surface-glossing. It shows that the degree of surface-glossing decreases with elapsed time.

Properties of Charcoal-Packed Wood Panel (목탄충진 목재판넬의 특성)

  • 김남훈;황원중;권구중;권성민
    • Journal of the Korea Furniture Society
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    • v.15 no.1
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    • pp.9-16
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    • 2004
  • Five type boxes manufactured from cement(A), wood panel(B), charcoal-packed wood panel(C), plywood panel(D) and charcoal-packed plywood panel(E) were prepared. Relationship of preservation characteristic of strawberry and relative humidity, and properties of thermal and sound insulations in the boxes were examined. During the experimental duration, relative humidity in the cement box was highest and lowest in the charcoal-packed wood panel box. Weight loss of strawberry was greatest in charcoal-packed wood panel box and very little in cement box. In the boxes with charcoal-packed wood panel box and very little in cement box. In the boxes with charcoal, strawberry was preserved for 10 days without getting mold, but in cement box it was covered with mold in 3 days. The charcoal-packed boxes showed higher thermal insulation property than the cement box. There were no significant differences in the property of sound insulation among the 5 type boxes. Consequently, it is suggested that charcoal-packed wood panels can be used for a better ecomaterial.

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Integration of Headspace Solid Phase Micro-Extraction with Gas Chromatography for Quantitative Analysis of Formaldehyde

  • Lo, Kong Mun;Yung, Yen Li
    • Bulletin of the Korean Chemical Society
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    • v.34 no.1
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    • pp.139-142
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    • 2013
  • A study was carried out to evaluate the solid phase micro-extraction (SPME) for formaldehyde emission analysis of uncoated plywood. In SPME, formaldehyde was on-fiber derivatized through headspace extraction and analyzed by gas chromatography coupled with mass spectrometry (GC/MS). The SPME was compared with desiccators (DC-JAS 233), small-scale chamber (SSC-ASTM D6007) and liquid-liquid extraction (LLE-EPA 556) methods which were performed in accordance with their respective standards. Compared to SSC (RSD 4.3%) and LLE (RSD 5.0%), the SPME method showed better repeatability (RSD 1.8%) and not much difference from DC (RSD 1.4%). The SPME has proven to be highly precise (at 95% confidence level) with better recovery (REC 102%). Validation of the SPME method for formaldehyde quantitative analysis was evidenced. In addition, the SPME by air sampling directly from plywood specimens (SPME-W) correlated best with DC ($r^2$ = 0.983), followed by LLE ($r^2$ = 0.950) and SSC ($r^2$ = 0.935).

A Study on the Furniture Design Applied with the Characteristic of Mother-of-pearl and Birch plywood (자개와 자작나무합판의 특성을 적용한 가구디자인 연구)

  • Song, Yoon-Sup
    • Journal of the Korea Furniture Society
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    • v.22 no.4
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    • pp.245-251
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    • 2011
  • The purpose of this research is to provide new direction on the field of the furniture design and to establish the identity of Korean furniture design as the flow of craft's juxtapose mixture era where it mix and match Korean traditional craft style materials with the modern furniture design. In other words, it is intended to create new furniture design and propose beautiful Korean luxury furniture design based on the precious unique culture with the traditional craft style, juxtaposition of modern furniture, and reinterpretation. It should grant artistic values that can satisfy consumers having various tastes and scarcity values, plus it should put out aesthetic and creative expressions in furniture design putting into the beautiful traditional craft form values. Furthermore, it is required to create new design through values and spirit, materials, techniques, forms, pattern, and usages by interacting, coordinating, and combining tradition and modern East and West, plus craft and design.

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Moistureproof Characteristics of Woodboard Types with Surface Thermal Changes (목질 보드류의 표면 열변화에 따른 접촉각(방습) 특성)

  • Shin, Sang-Ho;Liim, Nam-Gi
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.11a
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    • pp.161-162
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    • 2020
  • In this study, as part of securing related data, water droplets were dropped on the upper part of the wooden board for flooring in an environment such as floor heating, and the degree of absorption according to the surface temperature change was tested. The test results showed that the contact angle of the surface was low (25℃→40℃) or the droplet was absorbed into the small plate and disappeared. The contact angle of the OSB and MDF was decreased within 30 minutes, but the surface water droplet was maintained longer than the plywood. This is because the surface is coated with hydrophobicity unlike the plywood, but moisture absorption in the cross section after the second processing will not be prevented and it will lead to defect occurrence problem.

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