폐MDF의 해리와 고해처리를 통한 고밀도 Fiber Board제조

이화형,서인수,조윤민,박한상,Lee, Hwa-Hyoung,Seo, In-Su,Cho, Youn-Min,Park, Han-Sang 한국가구학회 2006 한국가구학회지 Vol.17 No.1

This study was carried out to resplace traditional virgin wood fiber by recycled MDF-waste fiber for the manufacture of high density fiberboard. For the recycling, MDF waste was disintegrated for 10 minutes and beaten for 15 minutes. There was no difference in formaldehyde emission by desiccator method between virgin wood fiber and disintergrated and beaten MDF-waste fiber. Fiberboard which was maded from 100% of disintergrated and beaten MDF-waste fiber showed similar physical and mechanical properties to those of virgin fiber. The yield of recycled fiber from MDF waste was 85%.

타닌 - MDI 접착제와 UF 의 혼합비에 따른 포름알데히드 방산 제거효과

이화형,강석구,김환생 ( Hwa Hyoung Lee,Seog Goo Kang,Hwan Saeng Kim ) 한국목재공학회 1995 한국목재공학회 학술발표논문집 Vol.1995 No.-

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.

아세칠화 WPC 이중개질처리에 의한 전통창호 소나무재의 물성 개선

이화형,이민경,Lee Hwa Hyoung,Lee Min Gyoung 한국가구학회 2003 한국가구학회지 Vol.14 No.1

Wood cell-wall modification with acetic anhydride, lumen filled with styren monomer and methyl methacrylate, and a combination of these two treatments were studied for their effectiveness for dimensional stability. Compared to those of untreated Pinus densiflora Sieb. et Zucc and sole acetylated red pine, The combination of acetylation and impregnation with methy methacrylate greatly reduced water absorption, increased ASE to the best and gave better bending strength and compression strength.

폐 MDF 폭쇄 섬유로부터의 MDF제조

이화형,서인수,조윤민,박한상,Lee Hwa-Hyoung,Seo In-Su,Cho Youn-Min,Park Han-Sang 한국가구학회 2005 한국가구학회지 Vol.16 No.1

This study was carried out to displace traditional virgin wood fiber by exploded MDF-waste fiber for the manufacture of medium density fiberboard. MDF waste was exploded in condition of $215^{\circ}C,20$ minutes. The higher the mixing ratio of exploded MDF-waste fiber, the lower the MOR and IB of MDF. There was no difference of formaldehyde emission by desiccator method between virgin wood fiber and exploded MDF-waste fiber. Adding $25^{\circ}C$ of exploded MDF-waste fiber met the KS of MDF 15 type.

扶餘 陵山理 寺址 출토 목재 수종식별(1)

이화형(Hwa Hyoung Lee),이종신(Jong Shin Lee) 한국가구학회 2001 한국가구학회지 Vol.12 No.2

This study was carried out to identify wood species excavated at the temple site of Backjae dynasty in Neungsanri, Buyeo. At this temple site, there were great excavations such as Backjae Incense Burner(National Treasure No.287) and Stone Reliquary(National Treasure No.288). The King Chang 13 Year carved on Stone Reliquary indicated that this temple was completed in A.D 567. Identification of wood species were as follows:<br/> The Temple building was constructed by Pinus densiflora Sieb. et Zucco<br/> The species of the main pillar of Wooden Pagoda which preserved relics of the Buddha was Zelkova serrata Makino.<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/>

표층파이버와 내층미세파티클 複合보드의 物理機械的 性質에 관한 硏究

이화형(Hwa Hyoung Lee) 한국가구학회 1993 한국가구학회지 Vol.4 No.1

This study was carried out to examine the effect of the composition ratio of fiber to core-fine particle and the physical and mechanical properties of composition boards. By manufacturing composite boards as used in tjis stidy, it is expected that the board have high surface and edge quality and production cost be lowered. Composite board were manufactured under laboratory conditions from furnishs derived from mixed conifer species and composed of fibers and fine screen particles from plants. The composite boards were evaluated in terms of their modulus of rupture(MOR), modulus of elasticity(MOE), internal bond(IB), water absorption(WA), thickness swelling(TS) and linear expansion(LE).<br/> The results were obtained as follows:<br/> 1.The highter ratio of face-fiber to core-fine particle(1:1<2:1)showed better MOR and MOE. Composition ratio was proved to be more important facter than adhesive content.<br/> 2.The higher content of adhesive in core-fine particle(6%<9%)gave better results of IB.<br/> 3.Higher composite ratioof core-fine particle increased LE and higher ratio of face-fiber increased TS. However, addition of 0.5%of parpffin wax emulsion had satisfactory effects on dimensoinal stability of composite board.

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/>

파티클의 붕산처리가 파티클보드의 접착력 향상에 미치는 효과

이화형(Hwa Hyoung Lee) 한국가구학회 1994 한국가구학회지 Vol.5 No.2

The biological resistance and fire retardation are important properties for the manufacture of special particle board. Boron-containing compounds have been known as a wood preservatives, fire retardants and insecticides.<br/> This study was carried out to examine the effect of boric acid on development of physical and mechanical properties as well as enhanced-adhesion of particle board which was manufactured with boric acid treated particles. The results are as follows:<br/> 1. The boric acid treatment(Impregnation threshold amounts reported in literature: 0.05%, 0.1% and 0.3% by oven dried weight of particle) incresed bending and internal bonding strength and did not show the statistical significance among them. When boric acid of 0.05% was treated to the particle, bending and internal bonding strength incresed by 35% and 39%, respectively, compared to the untreated.<br/> 2. The treatment of boron compound gave no effect on dimensional stability of particle board.<br/>