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低質칩으로 製造한 三層 및 單層 파티클보드의 物理的, 機械的 性質
이필우(Phill Woo Lee),강경택(Kyoung Taek Kang),양한승(Han Seung Yang) 한국가구학회 1994 한국가구학회지 Vol.5 No.1
This study was designed to investigate effective composition ratio of unscreened poor-grade pallman face particle including wood flour to commercial core particle in manufacturing 3- and single layered particleboards. Single-layered particle boards were made from the mixture of face and core particle at ratios of 20:80, 30:70, 40:60 and 50:50 while those of 3-layered particleboards were made from the composition ratios of face and back to core 20:80, 30:70, 40:60 and 50:50. Tests were concentrated on mechanical properties and dimensional stabilities. Mechanical properties of 3- and single layered particleboards were not significantly influenced by composition and mixing ratios of face to core particle up to 30:70. Dimensional stability of 3- and single-layered particleboards composed of mixture of face and core particle was similar to that composed entirely of face or core particles. Consequently, unscreened poor-grade face particle was considered to be used without any great problems.<br/>
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자외선 흡수제와 HALS가 첨가된 외장용 폴리우레탄 바니쉬의 분광 측광학적 특성
이필우(Phil Woo Lee),강경택(Kyoung Taek Kang) 한국가구학회 1995 한국가구학회지 Vol.6 No.1
UV transmission spectra of pure polyurethane varnish films containing hydroxybe nzophenolic and hydroxyphenylbellzotriazolic UV absorbers and HALS(Hindered Amine Light Stabilizer) was investigated by wet(dry) film thickness of 100(40), 130(55) and 160(70)μm. Also Yellowness Index Difference, Lightness Index Difference and Color Difference of the coated woods of Larix leptolepis were analized by traated level of UV absorber(O, 1, 2 and 3%) and HALS(O, 0.5, 1 and 1.5%), weathered for 160 and 320 hours in QUV Weather-Ometer. There was no significant effects on UV transmission spectra of dried polyurethane varnish films in the range of 300 to 400nm. The thicker films, however, the lower UV transmission became and hydroxybenzophenolie was inferior to hydroxyphenylbenzotriazolic in UV transmission spectra.<br/> The lowest Yellowness Index Difference, Lightness Index Difference and Color Difference were shown in the coated woods of Larix leptolepis at the treated level, when based on non-volatile content, of 3% in hydroxybenzophenolic UV absorber and of 1.5% in HALS to polyurethane varnish.<br/> Yellow Index Difference, Lightness Index Difference and Color Difference in the coated woods of Larix leptolepis increased with the increase of exposure time in QUV Weather-Ometer, in which the least diffcerence were shown at the treated level of 3% both in hydroxybenzophenolic and hydroxyphenylbenzotriazolic UV absorber.<br/>
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수용성 아크릴 수지의 자외선 흡수제와 HALSS 첨가가 일본잎갈나무의 변색에 미치는 영향
이필우,강경택 한국목재공학회 1996 목재공학 Vol.24 No.4
UV transmission spectra of water-soluble acrylic resin films containing hydroxybenzophenolic, hydroxyphenylbenzotriazolic UV absorber and HALS(hindered amine light stabilizer) were investigated by exposure time(before exposure. weathered for 160 and 320hours) in QUV Weather-Ometer. Also the YID(yellowness index difference). LID(lightness index differences and CD(color difference) of dried water-soluble acrylic resin films and the coated moods of Larix leptolepis were analyzed by addition level of UV absorber(0, 1, 2 and 3%) and HALS(0, 0.5, 1 and 1.5%) and by exposure time in QUV Weather-Ometer. They showed no significant effects on UV transmission spectra of dried water-soluble acrylic resin films in the range of 300 to 400㎚ irrespective of exposure tune. However. UV transmission decreased as increase of exposure time. UV transmission spectra were lower in dried water-soluble acrylic resin films containing hydroxybenzophenolic UV absorber and HALS than in these containing hydroxyphenylbenzotriazolic UV absorber and HALS in the range of 350 to 400㎚. The least YID, LID and CD in the coated woods of Larix leptolepis appeared at the addition level of 3%, based an non-volatile content, in hydroxybenzophenolic and hydroxyphenylbenzotriazolic UV absorber, and of 1.5% in HALE to water-soluble acrylic resin.
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