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심종섭,정희석,강선구,조재명 한국목재공학회 1982 목재공학 Vol.10 No.2
In order to investigate the annual mean equilibrium moisture content (EMC), the equilibrium moisture content investigated were the desorbed - and adsorbed equilibrium moisture content with two end-matched samples for red pine (Pinus densiflora S. et Z.), Douglas fir (Pseadotsuga menziesii Franco), oak (Quercus mongolica Fischer) and red lauan (Shorea spp.) in instrument screen at forest experiment station located in Seoul, Chuncheon, Daejeon, Kyungju. Jinju and Gwangju area for four years (1970. 1 - 1973. 12). The results summarized were as follows. 1. The annual mean desorbed equilibrium moisture content of red pine, Douglar fir, oak and red lauan were 14.8, 13.7, 14.0 and 14.2 percent respectively and higher than the annual mean adsorbed equilibrium moisture content of those species. 2. The annual mean desorbed - and adsorbed equilibrium moisture content in central areas (Seoul, Chuncheon, Daejeon) were higher than those in southern areas (Kyungju, Jinju, Gwangju). 3. On the whole, the monthly mean desorbed - and adsorbed equilibrium moisture content were lowest in April and highest in August though difference of month in areas. 4. Average and range of annual national equilibrium moisture content was 12.3∼14.2∼ 15.7 percent for desorbed equilibrium moisture content and 1.1.3∼13.2∼14.7 percent for adsorbed equilibrium moisture content and 12.0∼14.1∼16.4 percent for calculated equilibrium moisture content based on tempera ture and humidity.
조재명,정병재,강선구,김기현 한국목재공학회 1974 목재공학 Vol.2 No.2
1. Various gluing qualities applying Resorcinol Plyophen #6000 were studied on aiming the strength relationships of laminated woods resulted by single species [poplar (Populus deltoides), larch(Larix leptolepis)], mixed species of (paplar and larch), preservatives, treated poplar the scar joint with mixed species of poplar and larch and the scarf joint treated with preservatives. 1.1 On the black shear and on the DVL tension test, the mean wood failure ratio showed an excellent value i.e., above 65% and the tangential strength far larch was higher than that of radial, but it was reversed for poplar as shown in Tables 1 and 2. 1. 2 The lamina treated with Na-PCP reduced slightly the strength but the limited strength allowed for manufacturing laminated wood was not influenced by treating Na-PCP as shown in Tables 3 arid 4. 1.3 The safe scarf ratio in the Mane scarf joint was above 1/12 for larch and 1/6 for poplar regard less of the chemical treatment or untreatment as shown in Tables. 5, 6, 7 and 8. 2. In the normal and boiled state, the gluing quality of the laminated wood composed of single[poplar (Populus deltoidesy), larch (Larix leptolepis)] and double species (poplar and larch) glued with Resorcinal Plyophen #6000 were measured as follow, and also represented the delamination of the same laminated wood. 2.1 The normal block shear strength of the straight and curved laminated wood (in life sized were more than three times of the standards adhesion strength. And, the value of the boiled stock was decreased to one half of the standard shear adhesion strength, but it was more than twice the standard strength for the boiled stock. Thus, it was recognized that the winter resistance of the Resorcinol Plyophen #6000 was very high as shown in Tables 9 and 10. 2.2 The delamination ratio of the straight and curved laminated woods in respect of their composition were decraesed, in turn, in the following order i.e., larch, mixed stock (larch+poplar) and poplar. The maximum value represented by the larch was 3.5% but it was below the limited value as shown in Table 11. 3. The various strengthes i.e., compressive, bending and adhesion obtainted by the straight laminated wood which were constructed by five plies of single and double species of lamina i.e., larch (Larix leptolepis) and poplar (Populus euramericana), glued with area resin were shown as follows: 3.1 If desired a higher strength of architectural laminated wood composed of poplar (P) and larch (L), the combination of the laminas should be arranged as follows, L+P+L+P+L as shown in Table 12. 3.2 The strength of laminated wood composed of laminas which included pith and knots was conside rably decreased than that of clear lamina as shown Table 13. 3.3 The shear strength of the FPL block of the straight laminated wood constructed by the same species which were glued with urea adhesives was more than twice the limited adhesion strength, thus it makes possible to use it for interior constructional stock.