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내화처리가 파아티클보오드와 콤프라이보오드의 기술적 성질 및 내화도에 미치는 영향
권진헌,이필우 한국목재공학회 1985 목재공학 Vol.13 No.4
This research was conducted to examine the feasibility of developing fire retardant particleboard and comply-board. Particleboard were manufactured using meranti particle(Shorea spp.) made with Pallmann chipper, and complyboard meranti particle and apitong veneer (Dipterocarpus spp.). Particles were passed through 4㎜ (6 mesh) and retained on 1㎜ (25 mesh). Urea formaldehyde resin was added 10 percent on ovendry weight of particle. Face veneer for complyboard was 0.9, 1.6 and 2.3㎜ in thickness and spread with 36 g/(30.48 ㎝)² glue on one side. Veneers were soaked with 10 percent solution of five fire retardant chemicals (diammonium phosphate, ammonium sulfate, monoammonium phosphate, Pyresote and Minalith), and particles with 5, 10, 15 and 20 percent solution of five chemicals. Particleboard and complyboard were evaluated on physical and mechanical properties, and fire retardancy. The results obtained were summarized as follows. 1. Among five Fire retardant chemicals treated to particleboard and complyboard, the retention of ammonium sulfate in 5 percent solution showed the lowest as 1.39 ㎏/(30.48 ㎝)³ exceeding the minimum retention of 1.125 ㎏/(30.48 ㎝)³ recommended by Forest Products Laboratory and Koch. 2. Particleboard and complyboard treated with diammonium phosphate showed higher modulus of rupture (MOR), modulus of elasticity (MOE), internal bond strength and screw holding power than those with the other chemicals. 3. MOR and MOE of complyboard treated with fire retardant chernicals were greater than those of fire retardant particleboard. 4. Thickness swelling of fire retardant complyboard was lower than that of fire retardant particleboard. 5. The moisture content of the boards treated with Pyresote and Minalith increased and with monoammonium phosphate reduced. 6. Fire retatdant particleboard showed no ignition, and fire retardant complyboard started ignition, but time required to ignite was prolonged comparing the controlboard. Complyboard with only shell veneer treated showed ignition and lingering flame, but lingering flame time was shorter than controlboard. Complyboard with treated both core and veneer showed ignition but not lingering flame. 7. Flame length, carbonized area and weight loss were smaller than controlboard but had no significant difference among chemicals treated. 8. Temperature of unexposed surface of fire retardant particleboard was lowered with the increasing concentration of five chemicals. 9. Temperature of unexposed surface of fire retardant particleboard was the highest in Pyresote and the lowest in Minalith. 10. Temperature of unexposed surface of fire retardant complyboard was lower than that of controlboard.
왁스첨가 순서 , 첨가량 , 종류가 lsocyanate 접착 PB 의 성질에 미치는 영향
권진헌 한국목재공학회 1995 목재공학 Vol.23 No.2
Research was conducted at the Wood Materials and Engineering Laboratory, Washington State university, Pullman, WA to evaluate the effects of the sequence of wax addition, wax level, and wax type on mechanical properties and water resistance performance of isocyanate-bonded particleboard. Mechanical properties and water resistance performance were not influenced significantly by the sequence of wax addition. Internal bond and wet modulas of rupture in bending strength were decreased significantly by increasing the wax emulsion level, but dry modulus of rupture and modulus of elasticity in bending strength were not decreased significantly by increasing the wax emulsion level. Dry internal bond, dry and wet moduli of rupture, and modulus of elasticity were not decreased by increasing the solid wax level except for wet internal bond. The addition of 1.0 and 1.5% wax level did not produce any significant additional water resistance effect when compared to the addition of 0.5% wax level. Internal bond values of boards with solid wax addition showed significantly better results than boards with just a wax emulsion added. Modulus of rupture, modulus of elasticity, and water resistance performance did not show significant difference between Solid wax and wax emulsion.
최용순,황원중,한태형,김남훈,권진헌 江原大學校 森林科學硏究所 1998 Journal of Forest Science Vol.14 No.-
要約표고폐골목의 재활용을 목적으로 폐골목과 정상재의 칩을 일정비율로 혼합하여 얻은 목질보드의 성질을 조사, 검토하였다. 그 결과 폐골목의 목섬유는 정상재보다 다소 짧고 표 면이 거칠었으며 폐골목 변재부의 밀도는 정상재에 비해 상당히 낮았다. 파티클보드의 두께 팽윤율 및 파괴계수의 시험결과 폐골목을 25~50% 정도 혼합한 경우는 정상재와 비슷한 값 을 나타냈다.결론적으로 폐골목은 파티클보드의 재료로 사용될 수 있고 정상재와의 혼합비율은 25~50% 범위에서 조정되어야 할 것으로 생각되었다.ABSTRACTTo provide further information for reutilization of the bed-logs decayed by oak mushroomfLentinus edodes), the properties of wood-based board prepared with mixed materials of normal wood and bed-logs were examined.Wood fibers in bed-logs showed different morphology from normal wood fibers, that is, shorter length and rough surface. Thickness swelling increased with increasing mixing ratio of bed-log. On the other hand, modulus of rupture(MOR) in bending strength decreased. In products, the visual surface of board prepared from higher mixing rate of bed-log chips was smooth.Consquently, it is considered that the optimum mixing rate of bed-log to normal wood is the range of 25-50% and the bed-log can be used for raw material of board instead of normal wood.
輸入闊葉樹材의 pH 및 Buffuring Potential이 尿素樹脂接着劑의 Gel시간에 미치는 影響
권진헌(Jin Heon Kwon) 한국가구학회 1994 한국가구학회지 Vol.5 No.2
The pH and buffering potential for water extract of eight imported hardwoods were determined. A<br/> pH range of 3.608 to 5.831 was found. The gelation time for a urea-formaldehyde resin for each wood was determined. Result shows that gelation time of a urea-formaldehyde resin was directly correlated to the pH and inversely correlated with acid-buffering potential for eight hardwoods aqueous extracts.<br/>
주요국산재의 pH 및 Buffering Potential이 요소수지접착제의 Gel시간에 미치는 영향
권진헌(Jin Heon Kwon),한태형(Tae Hyung Han),류경산(Kyung San Ryu) 한국가구학회 1999 한국가구학회지 Vol.10 No.1
The pH and buffering potential for water extract of seven hardwoods and three softwoods were determined. The pH values ranged from 3.81 to 5.51 for hardwoods and 4.08 to 5.49 for softwoods. The gelation time for a urea-formaldehyde resin for each wood was determined and found to be a range of one minute thirty seven seconds to two minutes thirty nine seconds. Results shows that gelation time of a urea-formaldehyde resin was directly correlated to the pH and inversely correlated with acid buffering potential for seven hardwoods and three softwoods aqueous extracts<br/> Keywords: gelation time, acid and base buffering potential, urea formaldehyde resin<br/>