EVALUATION OF QUALITY OF PLYWOOD MANUFACTURED FROM Pinus maximinoi, Pinus oocarpa AND Pinus tecunumannii WITH DIFFERENTS BOARD COMPOSITION

Este trabalho teve por objetivo avaliar a influ\ueancia de diferentes composi\ue7\uf5es estruturais sobre as propriedades mec\ue2nicas de pain\ue9is compensados de Pinus maximinoi , Pinus oocarpa e Pinus tecunumannii . Foram produzidos em laborat\uf3rio pain\ue9is compensados com sete l\ue2minas de 3,0 mm de espessura, com composi\ue7\ue3o padr\ue3o, refor\ue7o longitudinal e refor\ue7o transversal. Para a colagem de l\ue2minas foi utilizada resina fenol-formalde\ueddo com a seguinte formula\ue7\ue3o em partes por peso: resina = 100, extensor = 10 e \ue1gua = 10. A gramatura empregada foi 160 g/m\ub2 (linha simples). Os pain\ue9is foram prensados \ue0 temperatura de 150\ubaC, press\ue3o espec\uedfica de 15 kgf/cm\ub2 e tempo de prensagem de 15 minutos. Para avalia\ue7\ue3o das propriedades mec\ue2nicas foram realizados os ensaios de flex\ue3o est\ue1tica paralela e perpendicular \ue0 dire\ue7\ue3o das fibras das l\ue2minas das capas. Os pain\ue9is de Pinus maximinoi apresentaram resultados m\ue9dios superiores de MOE e MOR paralelo e perpendicular em rela\ue7\ue3o aos pain\ue9is de Pinus oocarpa e Pinus tecunumannii. Os pain\ue9is produzidos com as tr\ueas esp\ue9cies estudadas apresentaram resultados satisfat\uf3rios de MOE e MOR, paralelo e perpendicular, em compara\ue7\ue3o aos pain\ue9is compensados comerciais produzidos de Pinus taeda . As inclus\uf5es de refor\ue7o longitudinal e transversal n\ue3o influenciaram significativamente nos resultados m\ue9dios de MOE e MOR paralelo. O refor\ue7o longitudinal afetou negativamente os resultados m\ue9dios de MOE e MOR perpendicular.This study was developed to evaluate the effects of different compositions of plywood of Pinus maximinoi , Pinus oocarpa e Pinus tecunumannii . Were manufactured in laboratory plywood composed by seven veneer with 3,0 mm thickness, with standard composition, longitudinal reinforced composition and transversal reinforced composition. Were used for veneer gluing the phenol- formaldehyde resin with the following formulation in parts of weight: resin = 100, extender = 10 and water = 10. The amount of glue spread was 160 g/m\ub2 (one side layer). The boards were pressed at temperature of 150\ubaC, specific pressure of 15 kgf/ cm\ub2 and press time of 15 minutes. Were realized static bending tests in the parallel and cross direction. The boards of Pinus maximinoi showed better results in MOE and MOR, parallel and cross direction in comparison to boards of Pinus oocarpa and Pinus tecunumannii. The boards made from three species showed satisfactory results of MOE and MOR, parallel and cross direction, in comparison to commercial plywood of Pinus taeda . The veneer reinforced in to parallel and cross direction not influenced significantly in the results of MOE and MOR parallel direction. The longitudinal veneer reinforced plywood affects poorly the results of MOE and MOR in the cross direction

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京都大学0048新制・課程博士博士(医学)甲第15935号医博第3520号新制||医||985(附属図書館)28514京都大学大学院医学研究科医学専攻(主査)教授 清水 章, 教授 生田 宏一, 教授 髙田 穣学位規則第4条第1項該当Doctor of Medical ScienceKyoto UniversityDA