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목질플레이크와 폴리프로필렌망 (網) 플레이크 구성이 톱밥보오드의 팽장성과 휨성질에 미치는 영향
이필우,엄영근,오세창,정인주 ( Phil Woo Lee,Young Geun Eom,Sei Chang Oh,In Ju Chung ) 한국산림과학회 1988 한국산림과학회지 Vol.77 No.2
This study was carried out to investigate the physical and mechanical properties of sawdust boards combined with sycamore and polypropylene-net flakes. Both the sycamore and polypropylene-net flakes were adjusted to the sizes of 1.0 × 1.0, 1.0 × 2.0, and 1.5 × 1.5㎠ and these flakes were mixed at 1, 2, 3, and 4% levels based on ovendry weights of sawdusts. The results obtained in this study were summarized as follows : 1. Thickness swellings of sawdust boards combined with sycamore flakes decreased with the increase of mixture levels and similar effects were also recognized in combination with polypropylene-net flakes. 2. Moduli of rupture both in sawdust boards combined with sycamore and polypropylene-net flakes increased with the increase of their mixture levels, and sawdust boards combined with sycamore flakes of 1.0 × 2.0 ㎠ size and polypropylene-net flakes of 1.5 × 1.5㎠ size showed higher moduli of rupture than control boards. 3. Moduli of elasticity both in sawdust hoards combined with sycamore and polypropylene-net flakes increased with the increase of their mixture levels as in moduli of rupture. 4. The physical and mechanical properties of sawdust boards combined with sycamore and polypropylene-net flakes were mainly dependent on aspect ratio of sycamore flakes and size of polypropylene-net flakes respectively, and these properties were improved with the respective increase of aspect ratio and size.
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효소지수법에 (酵素指數法) 의한 목질판상재료의 연소시험
이필우(Phil Woo Lee),정인주(In Ju Chung) 한국산림과학회 1989 한국산림과학회지 Vol.78 No.4
The oxygen index test was carried out to obtain the relative flammability of wood-based materials (plywood, MDF, particleboard) and their oxygen indices. The oxygen index is the minimum concentration of oxygen, expressed as volume percent, in a mixture of oxygen and nitrogen that will just support flaming combustion of a material under the specified laboratory conditions. In this study the oxygen indices were calculated by using the Dixon and Massey`s Up and Down method($quot;N$quot; Large method). The obtained results were as follows : 1. The oxygen indices calculated with Up and Down method were 27.9% for plywood, 26.9% for MDF, and 26.2% for particleboard, indicative of plywood being more difficult to burn than MDF and particleboard Lender the same surrounding conditions. 2. The oxygen indices were not affected by the total gas flow rate.
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크라프트펄프 폐액과 표면산화제(表面酸化劑)를 이용한 합판의 접착특성에 관한 연구
이필우,정인주 한국목재공학회 1988 목재공학 Vol.16 No.3
This experiment was executed to investigate the effect of activation of veneer surface by oxidizing agents, hydrogen peroxide and nitric acid, on bonding characteristics of Malas (Homalium foetidum Benth) plywood, in which the effects of these oxidizing agents amount, pretreatment time, and pressing time and temperature on shear strength of the plywood were examined and discussed. In this research the activation of venner surface by oxidants was effective in raising shear strength but the difference in shear strength was not observed between hydrogen peroxide and nitric acid treatment. Hydrogen peroxide treatment, however, seemed to be more profitable to industrial application because of its lower concentration and easier handling than nitric acid. The bonding method by lignin-phenol adhesive through surface activation revealed inferior shear strength to phenol- and urea-formaldehyde adhesive but superior water resistance to urea-formaldehyde adhesive and this bonding method, in addition, have the advantage of lower cost Lompared with phenol-formaldehyde adhesive. Therefore, this bonding method by Lignin-phenol adhesive through surface activation seemed to economical in manufacturing of water-resistant wood panel materials in future.
ScienceON
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