• 한국가구학회지
• /
• 제23권1호
• /
• pp.57-67
• /
• 2012

Recently, shows the possibility of providing such dyed-gathered woods after forming single boar This studyds with using cheap timbers generated by the thinning. It is helpful for master artisans are suffering from finding qualified materials. Traditionally, the master artisan has been used the beautiful grained wood from around roots of old zelkova trees and black persimmon trees. Instead, this study shows that dyed-gathered woods replace the natural grained wood and also produces a furniture made of an aggregate and a plate from walnut trees and ash trees which are a contrast to dyed-gathered woods. Dyed-gathered woods can reproduce the various colors to satisfy people's tastes, and the dignified grains that we can see in the old woods. Besides, dyed-gathered woods can replace rare materials and provide higher reliability of supplies.

• Journal of the Korean Wood Science and Technology
• /
• 제17권1호
• /
• pp.55-68
• /
• 1989

This experiment was carried out to investigate the crack of coated Nitrocellulose Lacquer on flatand edge-grained boards of Quercus acutissima, ring-porous wood, and Betula platyphylla var. japonica, diffuse-porous wood, by variations of moisture contents at 7, 13 and 21%. Cold check system was used as an accelerating method for crack development, in which one cycle of the system consisted of 10 replications of each unit cycle, $60^{\circ}C$ for 4hr followdd by $-20^{\circ}C$ for 4hr. The analysis of Nitrocellulose Lacquer characteristics was made by means of water permeation measurement, F.T.I.R. spectroscopy, N.M.R. spectroscopy, gel permeation chromatography, gas chromatography, and D.S.C. The results obtained were as follows: 1. The number of cracks increased with the increasing moisture content of board. 2. The crack of coated film on flat-grained board was fewer in number than on edge-grained board. 3. The crack occurred in Quercus acutissima was more numerous on edge-grained board but less frequent on flat-grained board compared with that in Betula platyphylla var. japonica, respectively. 4. The cold crack vertically developed to the grain both in Quercus acutissima and Betula platyphylla var. japonica. 5. Water permeability in intermediate coated film was lower than in under and top coated film, but the difference was not confirmed between under and top coated film.

• Journal of the Korean Wood Science and Technology
• /
• 제27권3호
• /
• pp.1-6
• /
• 1999

복잡한 구조를 지니는 바이올린 동체 설계 및 음질 평가률 위한 기본정보를 마련코자 바이올린 주요소재인 European spruce 및 European maple의 강제진동(强制振動) 의한 선형(線型) 휨진동(振動) 모드를 조사하고 소재밀도 및 절삭방향에 따른 진동모드별 공진(共振)주파수 변위를 분석하였다. 연구 결과 저비중재임에도 불구하고 spruce가 maple에 비해 더 높은 공진(共振) 주파수률 지님으로써 보다 우수한 음향특성을 지니는 것으로 나타났다. 또 spruce의 경우 접선방향으로 절삭된 판목재에 비해 방사방향 절삭된 정목재의 주파수 편차가 작아 균일한 음질을 위해서는 전반(前板)주요부품 가공시 정목판재를 사용하는 것이 바람직한 것으로 판단되었다. 그리고 두 수종 공히 소재밀도와 공진(共振)주파수간의 관계는 양의 상관관계를 나타냈으며, 절삭방향별로는 정목재의 상관계수가 판목재에 비해 놓게 나타났다.

• 한국가구학회지
• /
• 제13권2호
• /
• pp.19-28
• /
• 2002

This study was carried out to investigate the wood properties for efficient utilization of warm temperate tree species. The tested species were Actinodaphne lancifolia Meisn. grown in Korea. Fundamental wood properties such as anatomical, physical and mechanical properties and chemical components were examined. This species was diffuse porous, straight grained and fine textured wood. The heartwoods of this species was not distinguished clearly to the sapwoods. This species had moderate specific gravity, shrinkage, and mechanical properties. And this species had high content of the extractives by organic solvent.

• Journal of the Korean Wood Science and Technology
• /
• 제19권3호
• /
• pp.19-26
• /
• 1991

This study was carried out to investigate the solid wood bending properties of red pine(Pinus densiflora S. et Z.)naturally grown in Korea by boiling treatment The specimens were green and their dimension was $15\times15\times350mm$. The optimum conditions for solid wood bending processing of pine lumber are shown in Table 6 and the minimum solid bending radius was 240 mm in boiling treatment. The effects of knot on the degradation of bending processing properties were very severe and the failures of diagonal and torn grained wood were 20% and 30% respectively.

• Journal of the Korean Wood Science and Technology
• /
• 제35권6호
• /
• pp.23-30
• /
• 2007

구 조선총독부 청사의 기초 말뚝으로 사용된 원주는 1916년 건물 기초를 다지기 위해 사용되었던 것으로 1996년 청사의 철거와 함께 건축 당시 사용되었던 만여 개 중 백여 개가 발굴되었다. 이 말뚝은 문서 및 수종 식별결과 잎갈나무(Larix gmelini var. principis-ruprechtii Pilger)로 확인되었으며 현재 남한에서는 축적량이 매우 적은 수종으로 청사 건립 당시 백두산 압록강변에서 벌채한 것으로 기록되어 있다. 발굴된 잎갈나무 말뚝에 대해서 만재율 분포와 강도 특성을 알아보기 위해 주사(scanning)에 의한 횡방향 만재율 분포와 압축, 전단, 휨, 인장 시험을 행하여 그 강도 성능을 검토하였다. 만재율은 수로부터 수피 방향으로 연륜의 증가에 따라 증가하다가 약 25연륜 이후에는 40% 정도로 안정적인 경향을 나타냈다. 그러나 현미경에 의한 관찰에서는 심재부, 심변재 경계부, 변재부로 수령이 증가되면서 만재율은 감소하였다. 종압축강도는 높게 나타났으나 휨강도는 오히려 다소 낮게 나타나 고부재의 경우처럼 열화, 손상 등에 의한 강도적 감소는 압축형 시험보다 인장형 시험에서 영향을 크게 받는 것으로 밝혀졌다. 전단강도와 인장강도에 있어서는 접선단면 시험편의 변이계수가 높게 나타나 안정적인 강도 성능 비교를 위해서는 방사단면 시험편에 의한 강도 값이 채택되어야 할 것으로 검토되었다.

• 한국가구학회지
• /
• 제11권2호
• /
• pp.25-35
• /
• 2000

This study was carried out to investigate the wood properties for development the proper uses of lesser-known tree species. The tested species are Tamiang(Hydnocarpus woodii) Bangelem (Strombosia zeylanica) and Kamasulan(Anisophyllea ferruginea) grown in Indonesia. fundamental wood properties such as anatomical, physical and chemical properties and characteristics related to wood processing were examined. The results are summarized as follows : These species are diffuse porous, interlocked grained and coarse textured wood. Exceptionally, texture of Tamiang is fine. The heartwoods of these species are not distinguished clearly to the sapwoods. These species have high specific gravity, high shrinkage, and excellent strength properties. However, Tamiang has moderate specific gravity. Sawing characteristics are poor for these species except Tamiang. Sawing characteristics is moderate for Tamiang. Drying characteristics are moderate for Tamiang and Bangelem, and Poor for Kamasulan. The surfacing characteristics by planer are moderate f3r all these species. Bending property and durability are poor. Ash content is low in Bangelem.

• 한국가구학회지
• /
• 제11권1호
• /
• pp.13-23
• /
• 2000

This study was carried out to investigate the wood properties for development the proper uses of lesser-known tree species. The tested species are Kebambang(Pentace sp.), Bawang-bawang(Dysoxylum alliaceum Bl .), Garu buaya( Gonystylus brunescens A. Shaw)grown in Indonesia. fundamental wood properties such as anatomical, physical, mechanical and chemical properties and characteristics related to wood processing were examined. The results are summarized as follows : The woods of these species are diffuse porous, coarse textured, and interlocked grained. The heartwood of Kebambang is distinguished clearly to the sapwood, but the heartwood of other species are not distinguished clearly to the softwood. The woods of Kebambang and Bawang-bawang have the moderate weight density and the low strength properties, but Garu buaya has the high weight density and the high strength properties. The woods of these species has high shrinkage. The sawing characteristics of Kebambang are excellent but the other species are moderate. The machining characteristics by planer and drying characteristics of these species are moderate. These woods has poor characteristics in bending processing and decay durability. The wood of Bawang-bawang has high content of the extractives and lignin.

• Journal of the Korean Wood Science and Technology
• /
• 제44권5호
• /
• pp.726-735
• /
• 2016

본 연구는 두께 15 cm와 18 cm 크기 Douglas-fir, Hemlock, Radiata pine 정각재의 고온건조 특성을 평가하기 위해 수행되었다. 수종에 따른 최종함수율은 시험재의 두께에 관계없이 Radiata pine, Douglas-fir, Hemlock 순으로 Radiata pine에서 가장 낮았으며, 배할처리를 하였을 때 무처리재보다 낮은 함수율을 나타내었다. Radiata pine과 Hemlock의 경우 배할처리를 하였을 때 함수율과 뒤틀림 발생을 감소시키는 효과가 있는 것으로 나타났다. Douglas-fir는 수를 포함하지 않는 정목형태로 가공될 때 건조결함의 감소가 가능하였다.

• 한국가구학회지
• /
• 제18권1호
• /
• pp.39-46
• /
• 2007

This study was carried out to investigate the wood properties for efficient utilization of warm temperate tree species of Quercus acuta Thunb. grown in Korea. Fundamental wood properties in the anatomical, physical, mechanical and chemical characteristics were examined. Quercus acuta Thunb. is a radial-porous, straight grained and fine textured wood. The heartwood is not clearly distinguished from the sapwood. In physical properties, it has a high oven-dry specific gravity of $0.85{\pm}0.02$, and high shrinkage from green to air-dried condition of $7.05{\pm}0.52%$ in radial and $11.13{\pm}0.48%$ in tangential direction. Mechanical properties determined are strong with the MOR of $1,065{\pm}90kgf/cm^2$, and tensile strength parallel to grain of $1,490{\pm}258kgf/cm^2$ and shear strength of $175{\pm}13kgf/cm^2$. Also, this wood has high extractive contents: 11.11% for cold and 13.51% for hot water.