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논문 기본 정보

자료유형
학술저널
저자정보
이필우 (서울대학교 농과대학) 서진석 (임업시험장)
저널정보
한국목재공학회 목재공학(Journal of the Korean Wood Science and Technology) 목재공학 제15권 제3호
발행연도
1987.1
수록면
44 - 55 (12page)

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In order to study the effect of sawdustboard combined with plastic chips, 0.5mm($T_1$), 1mm($T_2$), 1.4mm($T_3$) thick nylon fiber. polypropylene rope fiber(RP), and 0.23mm thick moth-proof polypropylene net fiber(NP) were cut into 0.5, 1, 2cm long plastic chips. Thereafter, sawdustboard combined with plastic chips prepared as the above and plastic non-combined sawdustboard(control) were manufactured into 3 types of one-, two-, and three layer with 5 or 10% combination level. By the discussions and results at this study, the significant conclusions of mechanical and physical properties were summarized as follows: 1. The MORs were shown in the order of 3 layer> 2 layer> 1 layer among plastic non-combined boards, and $T_3$ < $T_2$ < $T_1$ < RP (NP(5%) < NP(l0%) among plastic combined boards. In 2cm long plastic chip in 1 layer board, the highest strength through all the composition was recognized. 1 layer board showing the lower strength with 0.5cm plastic chip rendered to the bending strength improvement by 2 or 3 layer board composition. On the other hand, 2 or 3 layer combined with 1, 2cm long polypropylene net fiber chips incurred MOR's conspicuous decrease requiring optimum plastic chip combined level and consideration to combined type. 2. MOE in plastic non-combined 3 layer board exhibited sandwich construction effect by higher resin content application to surface layer in the order of 3layer>1layer>2layer with the highest stiffness of the board combined with polypropylene chip, while nylon chip-combined board had little difference from plastic non-combined board. In relevant to length and layer effect, 3 layer board combined with the 0.5cm long polypropylene net fiber chip in 5% and 10% combined level presented 34-43% and 44-76% stiffness increase against plastic non-combined board(control), respectively. Moreover, in 1 layer board, 30% stiffness increase with 10% against 5% combined level in the 1 and 2cm long polypropylene net fiber chip was obtained. 3. Stress at proportional limit(Spl) showing the fiber relationship (r: 0.81-0.97) between MOR presented in the order of 1 layer<2 layer<3 layer in plastic non-combined board. Correspondingly, combined effect by layer and plastic chip length was similar to MOR's. 4. Differently from previous properties(MOR, MOE, Spl). work to maximum load(Wml) of 2 layer board approached to that of 3 layer board. Conforming the above phenomenon. 2 layer combined with 0.5cm long polypropylene net fiber chip kept the greater work than 1 layer. The polypropylene combined board superior to nylon -and plastic non - combined board seemed to have greater anti - failing capacity. 5. Internal bond strength(IB), in contrast to MOR's tendency. showed in the order of T1<T2<T3 in 1 layer combined with nylon chip. Compared with MOR's tendency, 1 layer combined with thin polypropylene chips showed the greater strength than thick nylon chip, probably due to compatible adhesion and compaction among thin, flexible reinforced plastic chip and sawdust particle. 1 layer board combined with polypropylene net fiber chip showed superiority in 5% to 10% level. Strength effectiveness of 1 layer board combined with 0.5cm long polypropylene chip compared with 3 layer was probably due to somewhat different density influenced by plastic inclusion(existence or non-existence) and lower resin content in inner layer of 3 layer. 6. Screw holding strength(SH) showed the highest in thin(0.5mm) chip for nylon fiber. In similar to Wml, 2 layer combined with 0.5cm long polypropylene net fiber chip in 5% and 10% combined level was superior to 1 layer, however, the hoard combined with polypropylene net fiber chip didn't revel such obvious difference as in MORs, maintaining 21-54% improvement against plastic non-combined board. 7. Thickness swelling in plastic non-combined board kept about 10%, and also thickness swelling(TS) of 2 layer board, lacking uniform plastic

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