道産材を用いた準不燃合板の製造条件の検討.pdfVIP

道産材を用いた準不燃合板の製造条件の検討.pdf

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道産材を用いた準不燃合板の製造条件の検討

道産材を用いた準不燃合板の製造条件の検討 -研究 (Original Article)- 道産材を用いた準不燃合板の製造条件の検討 河原﨑政行 平舘 亮一 由田 茂一*1 瀧澤 量久*2  岡野 朝雄*3 Investigation of Quasi-noncombustible Plywood Made from Trees Grown in Hokkaido Masayuki KAWARASAKI Ryoichi HIRADATE Sigeichi YOSHIDA Kazuhisa TAKIZAWA Asao OKANO Manufacture of quasi-noncombustible plywood made from trees (Cryptomeria japonica, Larix leptolepis, Abies sachalinensis , Tilia japonica) grown in Hokkaido was investigated. Veneers of those species were impregnated with boron-type fire retardant solution in hot bath treatment. In 30% fire 3 retardant solution, the chemical contents in veneer after treatment were 237kg/m for C. japonica 3 (sapwood) and 217kg/m for C.japonica (heartwood). The chemical content in veneer after treatment was influenced by the species. In comparison with C. japonica (sapwood), the chemical contents of L . leptolepis , A . sachalinensis and T. japonica were 41%, 75% and 70% respectively, in 30% fire retardant solution treatment. The chemical content impregnated in L . leptolepis was extremely low, showing that more investigation about treatment conditions is needed for L . leptolepis. Therefore, the fire performance of plywood made with treated veneer, except for L . leptolepis, was evaluated by cone calorimeter. For C. japonica , the 15-mm-thick plywood consisted of sapwood veneers and heartwood 3 veneer

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