내화처리 파티클 보오드의 휨강도와 물리적 성질에 미치는 약제의 영향

이필우 ( Phil Woo Lee ),권진헌 ( Jin Heon Kwon ) 한국목재공학회 1983 목재공학 Vol.11 No.3

옥촉서간 (玉蜀黍幹) , 송수피 (松樹皮) , 소맥 , 리기다송엽 , 잣나무엽 및 목분말을 (木粉末) 이용한 합판의 접착증량에 관한 연구

이필우,권진헌 ( Phil Woo Lee,Jin Heon Kwon ) 한국산림과학회 1981 한국산림과학회지 Vol.51 No.1

The purpose of this study was to evaluate the substitutional possibility of new extender instead of wheat flour, which is extending for plywood adhesives in Korea. As the extending materials corn stalk, pine bark, Pitch and Korean pine leaves, wheat, or wood flour were selected and prepared for the extending powders, dried at 103±2℃ during 24 hours in the drying oven, followed by being pulverized into 60-100 mesh powder. The extenders were mixed with urea formaldehyde resin in the ratio of 5, 10, 15 or 20%. After plywoods were manufactured by the above extended ratios, dry and wet shear strength and wood failures were analyzed and discussed. The results at the study may be summarized as follows; 1. In urea formaldehyde resin dry shear strength in plywood extended by wheat flour showed the highest value. 2. Among the extenders in 10 and 20% extension of urea formaldehyde resin wet shear strength of wood flour was higher than that of wheat powder. They had no significant difference statistically. 3. Among the extenders of 5% extension of water soluble phenol formaldehyde resin dry shear strength of plywood extended by Korean pine leaf powder showed the highest value, while wheat powder showed the highest value among 10, 15 and 20% extentions. 4. In water soluble phenol formaldehyde resin the best results of wet shear strength showed in wheat powder. 5. Among the extenders in 15 and 20% extension of water soluble phenol formaldehyde resin, dry and wet shear strength in plywood of corn stalk powder were the highest value next to wheat powder.

내화처리 (耐火處理) 파티클보오드의 COMPLY 접착이 휨강도와 전단강도에 미치는 영향

이필우,권진헌 ( Phil Woo Lee,Jin Heon Kwon ) 한국산림과학회 1984 한국산림과학회지 Vol.64 No.1

This research was conducted to examine the effect of bonding on the bending and shear strength of COMPLY-board when used with meranti face veneer and fire retardant treated particle-board core. For ammonium sulfate, modulus of rupture (MOR) of COMPLY-board increased with increasing chemical concentration up to 10 percent and then decreased after that concentration. However, Minalith showed reverse effect to the result for ammonium sulfate. Modulus of elasticity (MOE) of COMPLY-hoard decreased with increasing chemical concentration and its differences were not significant between concentration. Shear strength was shown better when treated with ammonium sulfate than with Minalith. Wood failure of COMPLY increased with increasing chemical concentration up to 15 percent and then decreased after that concentration, The products of parallel and cross veneer laminated were better than those of COMPLY composed of fire retardant treated particleboard core. Nontreated particle-board was the least in strength. MOE of fire retardant treated COMPLY increased by 136 percent and its MOE by 170 percent as compared with non treated particle-board.

합판용 요소 , 요소 메라민 공축합 (共縮合) 및 수용성 석탄산수지 (石炭酸樹脂) 접착의 증량에 관한 연구

이필우,권진헌 ( Phil Woo Lee,Jin Heon Kwon ) 한국산림과학회 1980 한국산림과학회지 Vol.48 No.1

This research was carried out to examine the substitutional feasibility of low-priced materials produced in waste of forest instead of wheat flour which is extended for plywood adhesives. Wheat, pine bark, wood flour and pine foliage of coniferous trees or poplar foliage of hardwood species were selected and pulverized into 60-100 mesh minute powder after they were dried at 100-105℃ during 24 hours in the drying oven. The prepared particles as above were added to urea formaldehyde resin, urea-melamine copolymer resin and water soluble phenol formaldehyde resin in the ratio of 10, 20, 30 and 50%. After plywoods were processed by the above extending ratios, shear strength of extended plywoods were analyzed and discussed. The results obtained at this study were summarised as follows; 1. In the case of urea formaldehyde resin, both dry and wet shear strength of plywoods extended by wheat flour were shown the highest value. 2. Dry shear strength of urea-melamine copolymer resin was better than that of urea formaldehyde resin on the whole, while plywoods extended by wheat flour were shown excellent results. 3. Among 10% and 20% extensions of urea-melamine copolymer resin, the best results were shown by poplar leaves powder, wheat powder and wood flour. They had no significant difference statistically. 4. In the case of water soluble phenol formaldehyde resin, although dry shear strength of pine leaves powder was higher than that of wheat flour in the ratio of 10%, there was no significant difference between them in the ratio of 10 and 20%. 5. Among 20, 30 and 50% extensions of water soluble phenol formaldehyde resin, wet shear strength of wood flour and bark powder was higher than that of wheat flour. Wet shear strength of wood flour in the ratio of 10% was shown the same tendency as above.

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.

건축재료연소시험기와 경사판 시험기를 이용한 합판의 내화도 (耐火度) 측정비교

이필우,권진헌 한국목재공학회 1982 목재공학 Vol.10 No.2

This experiment was carried out to evaluate the results of fire retardancy of sealer coated plywood by Building material combustibility tester and Inclined panel tester. At this study, weight loss percentage, flame exhausted time, burning point and smoke yield coefficient were examined. The findings of this study lead to conclusions as listed below. 1. It was obvious that weight loss percentage and flame exhausted time of Inclined panel tester had more remarkable tendency than those of Building material combustibility tester. 2. Burning point was determined by Inclined panel tester while smoke yield coefficient by Building material combustibility tester. 3. Weight loss percentage decreased remarkably with proportion to the increase of sealer coated amount during 5 minutes burning. 4. Flame exhausted time decreased with proportion to the increase of sealer coated amount during 3 minutes burning. 5. Burning paint indicated increasing tendency with proportion to the increase of sealer coated amount. 6. Smoke yield coefficient of urea sealer showed definite inclination decreasing with the increase of sealer coated amount.

내화처리 (耐火處理) 파티클보오드의 내화도(耐火度)에 미치는 약제의 영향

이필우,권진헌 한국목재공학회 1983 목재공학 Vol.11 No.5

This research was performed to investigate the fire retarding properties of the particleboard formed with treated particles in the solutions of ammonium sulfate and Minalith, each of commercially important fire retardant chemicals. Laboratory test boards were made from particles treated by soaking in 5, 10, 15 and 20 percent concentration solutions of chemicals for 2 hrs. before resin was applied. According to the results, the Eire retarding effect of treated particleboard showed considerable difference compared with the untreated controlboard in weight lass, fingering flame time, burning paint, flame length and carbonized area. The boards treated with higher chemical concentrations indicated better results than lower. Minialith gave better results than chose obtained from the treatment of ammonium sulfate in weight loss, burning point, flame length and carbonized area, However no both chemicals gave significant difference in lingering flame time. Parallel and alternate veneer laminated products showed the same tendency as the untreated particleboard although they had a little difference.