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| PDF : |  10010017.pdf |
| title(En) : | Creep Deformation in the Pressing Process of Plywood |
| author(En) : | Motoaki Okuma |
| information : | Mokuzai Gakkaishi 10(1), 17-21 (1964) |
| assort : | Original Article |
| summary(En) : | Heating platens were set to the heads of a creep testing machine, and during the pressing of veneers with or without adhesive at different temperatures, the total thickness was measured. The author applied the experimental results to an equation δ = A logt + B (1), where δ : compressive deformation during pressing (cm), t : pressing time(min) and A, B : experimental constants. The results obtained are summarized as follows : 1) The compressive deformation is found to be larger with the increase of moisture content (especially the amount of the water contained in adhesive), the temperature of the platen, the pressure and the pressing time (Figs 3,7). 2) The resultant decrease of total thickness of the plywood during bonding ( = initial total thickness of veneers minus final thickness of plywood) has a linear relation to the pressure, and it's recovery is very small (Fig 6). 3) In the case of bonding 5-ply plywood, creep deformation curve is divided into three parts on the δ - logt relation, and this tendency becomes more conspicuous as the moisture content of plywood increases (Fig. 7). |