습식공법으로 제조한 목탄-목재섬유복합재료의 에틸렌가스 흡착력과 과일 신선도 유지 효과

이화형,김관의,Lee Hwa Hyoung,Kim Gwan Eui 한국가구학회 2003 한국가구학회지 Vol.14 No.1

This research was carried out for packing materials and building materials to examine thylene gas adsorption and effect of keeping fruit fresh of wet formed charcoal-fiber mposite made from defibrated fiber of Pinus densiflora Sieb. et Zucc. and white charcoal from uercus variabilis Bl.(wood fiber: charcoal=8:2, 6:4, 4:6, 2:8), with/without phenol formaldehyde resin(PF, Non volatile content:$52\%$, resin content $1,3,5\%$). The results are summarized as follows: 1. The higher the charcoal content, the more the ethylene gas adsorption. At the same mixing ratio of fiber to charcoal, $\#100-200$ of charcoal particle size gave the better reslts than $\#60-100$. 2. Adding PF into the charcoal fiber composite decreased the capacity of ethylene gas adsorption but there was no significant difference until $5\%$ adding amount of PF. 3. For keeping fruit fresh for a long time, Charcoal fiber composite was $66\%$ longer than control. The higher the white charcoal content, the longer fresh time.

저농도 페놀수지 주입처리에 의한 평죽판 개발(1)

이화형(Hwa Hyoung Lee),김관의(Gwan Eui Kim) 한국가구학회 2001 한국가구학회지 Vol.12 No.2

This study was carried out to develope a new process of flattening bamboo pieces(3 months old) by two steps of utilizing microwave oven and hot press. Internode bamboo pieces were impregnated with low molecular weight phenol formaldehyde resin (PF) under vacuum of 76 cmHg, heated in a household microwave oven in 1 minute, pressed on the temperature of 145"C by the hot press for 10 minute, and then cooled by the cold press in their flattened form. The physical and mechanical. properties of compressed flattened bamboo were as follows:<br/> 1) PFl(Mw:427) and PF2(Mw:246) sol. met the success of flattening of internode bamboo pieces in both of P. bambusoides and P.nigra var. PF2 showed the more plasticity to flatten the bamboo than PFl. The PF2 sol. with low molecular weight(Mw:246) gave the more weight gain than that of PFI in the equal concentration. PFI of 5% (NVC) and PF2 of 10% (NVC) sol. gave the best result for physical and mechanical properties and from a economical view point.<br/> 2) The PFI of 5% (NVC) sol. with low molecular weight decreased the water absorption of 62-63% and increased the bending strength (MOR) of 80-90%, compression strength of 43-54%.<br/> 3) The PF2 of 10% (NVC) sol. with low molecular weight decreased the water absorption of 56-57% and increased the bending strength (MOR) of 64-86%, compression strength of 39-63%.<br/> <br/> <br/>

3개월생 국산 대나무를 이용한 대나무 스트랜드보드 개발

이화형(Hwa Hyoung Lee),강석구(Seog Goo Kang),김관의(Gwan Eui Kim) 한국가구학회 2000 한국가구학회지 Vol.11 No.2

This study was carried out to determine the suitability of 3 months old bamboo species of Phyllosrachys bambusoides S. et Z., Phyllosrachys pubescens Mazel and Phyllosrachys nigra var henonis Stapf as raw materials for the manufacture of strandboard.<br/> Total of 108 strandboards were made using urea-formaldehyde resin content level of 12% and one percent of liquid wax emulsion. The strandboard consisted of threelayers the top and the bottom layer of which were oriented to the same direction and weighed 25% of the strandboard each. The middle core layer weighed 50% of the board and was perpendicular to the outer top and bottom layers. Analysis was performed to determine the effect of strand lengths and growing years of 3 months, 2 years and 3 years on strandboard properties. The physical and mechanical properties of bamboo species and boards were measured and compared to the standard requirements of strandboards. The results are as follows;<br/> 1. The more the growing years the higher the density of bamboo. Top part of bamboo indicated higher density value than that of bottom part.<br/> 2. Bamboo showed higher static bending strength compared to the main wood species. Longer growing years of bamboo generally incresed the static bending strength but there were no statistical significancies for Phyllosrachys bambusoides S. et Z. and Phyllosrachys pubescens Maze!.<br/> 3. Strand length indicated no difference on density and moisture content of strandboard. 5 cm of strand length gave the best static bending strength and internal bonding strength. Bamboo strandboard exhibitedlesser extents of thickness swelling than that of CSA standard.<br/> 4. 3 months old bamboo gave higher static bending strength of strandboard than those of 2 years and 3 years old bamboo. In case of Phyllosrachys nigra var henonis Stapf, 3 months old bamboo indicated higher internal bonding strength than those of 2 years and 3yearsold bamboo. but in Phyllosrachys bambusoides S. et Z., Phyllosrachys pubescens Mazel, there were no difference among growing years. Growing years showed no different physical properties of bamboo strandboard.<br/> Keywords: Bamboo strandboard, 3 months old bamboo<br/>

점토목재파티클보드로 제조된 Clay-Woodceramics의 성질

이화형,김관의 한국목재공학회 2003 목재공학 Vol.31 No.5

본 연구는 목재파레트폐잔재 파티클과 페놀수지(고형분함량 50%. 함지율 30%) 및 점토를 사용하여 3층 점토목질파티클보드를 제조하고 소정의 탄화온도(400℃, 600℃, 800℃)에서 탄화하여 Clay-Woodceramics를 제조한 후 물리·기계적 성질을 검토하였다. 점토의 효과를 구명하기 위하여 전건파티클중량의 10%. 20%, 30%를 첨가하였으며 연구 결과는 다음과 같다. 1. Clay-Woodceramics의 탄화수율은 탄화온도가 높을수록 감소하였고, 폭 및 두께 수축율은 증가하였다. 그러나 Clay첨가량이 많을수록 탄화수율은 증가하였으며 폭 및 두께 수축율은 감소하였다. 2. Clay-Woodceramics의 비중은 탄화온도가 높을수록 증가하며, 흡습율도 증가하였다. Clay의 첨가량이 많을수록 같은 온도조건에서 높은 비중을 나타냈으며, 흡습율은 감소하는 경향을 보였다. 그러나 흡수율은 제조조건에 따른 통계적인 차이가 없었다. 3. 탄화온도가 높아짐에 따라 Clay-Woodceramics의 휨강도 및 휨탄성계수는 증가하는 경향을 나타냈다. This research was carried out to examine physical and mechanical properties of clay-woodceramics which were carbonized for 3 hours in a specia furnace from 3 layers-clay-woodparticleboard made from pallet waste wood, phenol foraldehyde resin(hereafter PF, Non volatile content 52%, resin content 30%) and clay(10%, 20% and 30%). Carbonization temperature was 400℃, 600℃ and 800℃. The results are summarized as follows: 1. The higher the carbonization temperature, the higher the dimensional sharinkage and the lower the carbonization yield ration. But the higher the clay addition, the lower the dimensional shrinkage and the higher carbonization yield ratio. 2. The higher the carbonization temperature, the higher the water absorption and the density. The higher the clay content, the higher the density. 3. The higher the carbonization temperature, the higher the bending Modulus of Rupture and bending Modulus of Elasticity.

3개월생 분죽을 이용한 대나무 파티클보드의 특성 : Phyllostacbys nigra var benonis Stapf

이화형,한기선,김관의 한국목재공학회 2002 목재공학 Vol.30 No.1

본 연구는 요소수지(고형분함량 60%)를 사용, 분죽 3개월생 국산 대나무를 이용하여 대나무 파티클 3층 보드를 제조하고 3년생과 그 보드의 물리 기계적 성질을 비교 검토하였다. 분죽의 수령이 파티클 보드의 비중과 기건함수율에 미치는 차이는 없었고, 제품의 두께 팽윤율은 함지율 11%부터 KS기준을 만족시켰으며 3개월생 보드가 3년생 보드보다 높은 수치를 나타냈다. 3개월생 파티클 보드의 휨강도가 함지율 3수준(9%, 11%, 13%)에서 모두 3년생보다 훨씬 높게 나타났고, 박리강도도 3개월생 보드가 3년생 보드보다 월등히 높았다. 3개월생, 3년생 보드 모두 KS기준강도보다 월등하였다. 보드의 포름알데히드 방산량값은 모두 E2 등급을 만족시켰다. This study was performed to determine the characteristics of particleboard made from three-months-old bamboo, (pbyllostacbys nigra var benonis Stapf) grown in Damyang district, Korea. Total 60 particleboards were manufactured with 1% of liquid wax emulsion using urea-formaldehyde resin content 9%, 11% and 13%, respectively. The particle boards consisted of three layers, in which face layer had the same proportion of a weight 25% of the particleboard each. And the core layer had a weight 50% of the board. The core layer and face layer had the particle dimension passing 6 mesh (3.35 ㎜), 12 mesh (1.70 ㎜), respectively. The study was carried out to determine the effect of the growing time of 3 months and 3 years on particleboard properties. The physical and mechanical properties of boards were measured and compared to the Korean standard (KS) requirements of particle boards. The results were as follows; 1. The longer the growing time, the higher the density of bamboo. Density of the upper part of bamboo showed higher than that of lower part. 2. Density and moisture content of the two particle boards did not show significant differences. Three-months-old bamboo particleboard gave higher thickness swelling than three-years-old bamboo particleboard. Bamboo particleboard passed the thickness swelling test of KS. 3. The static bending and internal bond strength of three-months-old bamboo particleboard were higher than those of three-years-old bamboo. Increase of resin contents in bamboo particleboard increased bending and internal bond strength, proportionally. Strength properties of bamboo particle board were above KS. 4. Formaldehyde emission of all the bamboo particleboards satisfied E_2 level (5.0 ㎎/L) of KS F 3104.