초록 ▼

○ 연구결과
고함수율을 갖는 국내산 리기다소나무, 잣나무, 낙엽송 판재를 이용하여 횡압축에 의한 방부처리 기술 개발을 검토한 결과, 리기다소나무와 잣나무의 경우 판재 두께의 약 50%의 압축량으로 우수한 방부제의 침윤도 및 흡수량을 얻을 수 있었다. 횡압축에 의한 판재의 두께 감소나 기계적 성질의 저하는 거의 발생하지 않았다. 그러나 함수율이 낮고 심재로만 구성되어 있는 낙엽송 판재에서는 거의 방부제 침투가 이루어지지 않아 횡압축에 의한 방부처리는 불가능하였다.
자상처리 후 횡압축에 의한 침엽수 판재의 방부처리를 실시한

○ 연구결과
고함수율을 갖는 국내산 리기다소나무, 잣나무, 낙엽송 판재를 이용하여 횡압축에 의한 방부처리 기술 개발을 검토한 결과, 리기다소나무와 잣나무의 경우 판재 두께의 약 50%의 압축량으로 우수한 방부제의 침윤도 및 흡수량을 얻을 수 있었다. 횡압축에 의한 판재의 두께 감소나 기계적 성질의 저하는 거의 발생하지 않았다. 그러나 함수율이 낮고 심재로만 구성되어 있는 낙엽송 판재에서는 거의 방부제 침투가 이루어지지 않아 횡압축에 의한 방부처리는 불가능하였다.
자상처리 후 횡압축에 의한 침엽수 판재의 방부처리를 실시한 결과, 횡압축 단독 처리에 비해서 리기다소나무와 잣나무 판재에서는 방부제의 침윤도 및 흡수량이 향상되어 자상처리 효과가 인정되었다.
횡압축 입체가공에 의해 방부처리를 실시한 결과, 횡압축 단독에 비하여 방부제 침투성이 향상되었으며 자상처리에서 나타난 판재의 휨강도 저하는 발생하지 않아 효과적인 고함수율 침엽수 판재의 방부처리기술로 개발할 필요성이 높았다.

Abstract ▼

Ⅳ. Results of research
From this investigation we obtained the following conclusions for the possibility of atmospheric pressure preservative treatment by the compression perpendicular to grain process using domestic pitch pine, korean pine and japanese larch lumber.
For the compression perpen

Ⅳ. Results of research
From this investigation we obtained the following conclusions for the possibility of atmospheric pressure preservative treatment by the compression perpendicular to grain process using domestic pitch pine, korean pine and japanese larch lumber.
For the compression perpendicular to grain process of the respective varieties for the lumber of pitch pine and korean pine, there were not much differences in the moisture contents.
A japanese larch which had low moisture content due to mostly core showed very poor compression perpendicular to grain process, resulting in very high load among three species.
The results of material conditions under the compression perpendicular to grain process showed that a new knot did not affect while the dead knot affected the compression perpendicular to grain process. Also we assumed that rosin was exudated by the compression perpendicular to grain process and influenced the penetration of water-soluble preservative.
For pitch pine and korean pine lumber having a relatively higher moisture content, the moisture content was drastically decreased owing to mass release of water while the decrease in moisture was not notable in larch.
For changes in density and reduction rate of permanent thickness of the lumber by the compression perpendicular to grain process, there were little changes in both observations. We assumed that this was caused by the compression perpendicular to grain process in the condition of green wood. For the effect of the compression perpendicular to grain process on the intensity, there were not close relationship between the lumber-treated and untreated. However, the intensity property was not influenced by the compression perpendicular to grain process under high moisture content.
For the preservative penetration property by the compression perpendicular to grain process, pitch pine and korean pine having a relatively higher moisture content due to sapwood showed that there were increases in injection rate and absorption with increasing number and amount of the compression perpendicular to grain process. However, there were little injection of the preservative in the larch having a very low moisture content due to relatively very high core proportion. On the other hand, there were drastic increase in injection of the preservatives when we store the boards to some period in a closed chamber without drying after preservative treatment by compression perpendicular to grain process.
For leaching of preservatives of the treated lumber under compression perpendicular to grain process, there were high leaching of copper in the order of pitch pine and korean pine lumber, resulting in higher retention and absorption by pitch pine lumber. There were less leaching of Cu for the japanese larch showing poor retention of the preservative.
For the concentration changes in treating preservatives during the compression perpendicular to grain process, there were slight decrease in Cu in the treating preservatives with increasing treatment of lumber under the compression perpendicular to grain process.
We investigated the preservative treatment method for the domestic softwood lumber using compression perpendicular to grain process after incising. The results obtained from the quality of the lumber and incising property showed that the incising properties were distinctive in pitch pine and korean pine lumber having low density and high moisture content, while the incising properties was poor in the lumber from the japanese larch lumber having low moisture content and a relatively high core proportion.
For the factors influencing the physical properties, the density of the lumber did not significantly influence the quality of the lumber. There were drastic decrease in moisture content in the lumbers under the compression perpendicular to grain process.
For the surface hardness of the lumbers, increases in incising depth and density did not affect the surface hardness compared with that of the untreated board. But the bending strength of the incising lumber showed less than that of the untreated. the bending strength of the incising board was distinctive with increasing incising depth and density.
For the defects of the lumber caused by incising treatment, there were cleavage in the incised japanese larch lumber with deep incising depth and density. But there were little cleavage in the boards of pitch pine and korean pine lumber having high moisture content.
For the penetration of the preservative, there were drastic increase in penetration and absorption for the incised lumbers, resulting in incising is effective in improvement of preservative penetration. Particularly, the japanese larch lumber having a low penetration showed increase in preservative penetration with incising.
For leaching of Cu for the preservative treated lumber, there were Cu leaching for all boards, especially in the boards of pitch pine and korean pine lumber having a relatively higher retention of the preservative. For this we assumed that the leaching if Cu was caused by washing the element physically adsorbed onto the lumber surface.
For the concentration changes of the preservatives during the treatment process, there were decrease in Cu with increase in lumber treated. This could be caused by transport of the preservatives into the board followed by decrease in available concentration of Cu.
For the possibility of preservative treatment for the softwood lumber under the compression perpendicular to grain process, a 3D surface process were done by V- and T-typed tooth.
For the effect of 3D surface process on the physical properties, there were little change in the density of the lumbers. There were also little changes in the moisture content due to little extraction of water owing to very small contact surface between the board and the tooth.
For the strength properties of the lumber, there were little decrease in surface hardness and bending strength. From this, we assumed that the 3D surface process did not influenced the strength properties of the boards. For the penetration of the preservative, there were increase in penetration of the preservative under 3D surface process and V-types 3D surface process was effective in penetration than that of V-types 3D surface process. For species, the lumbers of pitch pine and korean pine was favorable in penetration than that of the japanese larch lumber.
For leaching characteristics of the preservative from the treated lumbers and preservative concentrations produced during the treatment process, we obtained the same results for the only the compression perpendicular to grain process and sequential treatments of the compression perpendicular to grain process and incising.
Thus, the lumbers of pitch pine and korean pine showed a high possibility of the the compression perpendicular to grain process while little possibility for the japanese larch lumber due to wood quality under the atmospheric pressure. Compared to the compression perpendicular to grain process, the compression perpendicular to grain process after the incising showed high preservative penetration, that is, the most practical method.

목차 Contents

• 표지 ... 1
• 제출문 ... 2
• 요약문 ... 3
• SUMMARY ... 9
• CONTENTS ... 16
• 목차 ... 17
• 제1장 연구개발과제의 개요 ... 18
• 제1절 연구개발의 목적 ... 18
• 제2절 연구개발의 필요성 ... 19
• 제3절 연구개발의 범위 ... 22
• 제2장 국내외 기술개발 현황 ... 24
• 제3장 연구개발수행 내용 및 결과 ... 25
• 제1절 서 설 ... 25
• 제2절 횡압축 처리한 판재의 재질과 방부제 침투 특성 ... 27
• 제3절 자상처리 후횡압축 처리한 판재의 재질과 방부제 침투 특성 ... 61
• 제4절 횡압축에 의해 입체가공한 판재의 재질과 방부제 침투 특성 ... 86
• 제4장 목표달성도 및 관련분야에의 기여도 ... 108
• 제5장 연구개발 성과 및 활용계획 ... 112
• 제6장 참고문헌 ... 113
• 끝페이지 ... 115