Paneles unidos de canto y contrachapados fabricados con madera juvenil de Eucalyptus nitens
TL;DR: Lab results demonstrated that E. nitens plywood satisfies all the British Standard Institution requirements for exterior use and bonding quality in solid wood of juvenile (11 years) E. Nitens.
Abstract: SUMMARY This work evaluates the bonding quality in solid wood of juvenile (11 years) E. nitens. Edge-glued panels were manufactured and bonded with PVA (Polyvinyl acetate). The mechanical properties of the panels were determined and compared with those of mature (25 years) P. radiata panels. Shear strength values in E. nitens panels were found to be 35% higher than P. radiata panels according to British Standard EN 204-205 on non-structural adhesives for wood joining. Juvenile E. nitens wood venners were used to manufacture exterior ‐grade plywood panels. Laboratory results demonstrated that E. nitens plywood satisfies all the British Standard Institution requirements for exterior use.
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21 Nov 2012
TL;DR: In this paper, the Young's elastic modulus (EMO) was determined by three methods in a five-layer plywood from Eucalyptus nitens wood.
Abstract: It was determined the Young`s elastic modulus (EMO) by three methods in a five-layer plywood from Eucalyptus nitens wood. The control method had the lowest variability (22,45 %). The lower standard error respect to control method, corresponds to method 2 with a coefficient of 0,566. While, the higher variability correspond to method 3 (29,91%). However, the ANOVA indicates not significant difference between the means of each method. The average of Young`s elastic modulus obtained of 10,18 GPa in axial direction, indicates that the elastic behavior of plywood is similar to E. nitens solid wood (9,6 GPa). In addition, EMO obtained indicates that the plywood meets the requirements of brazilian standards NBR 9531 and NBR 9523 and european EN 310-1993, allowing its use in interior light construction, as concrete mold, furniture and general uses, although, according to APA standard not classified for heavy construction, marine and industrial use.
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TL;DR: In this article, the authors examined the penetration of PVA glue by light microscopy and scanning and transmission electron microscopy on wood cells and found that the wood cells were greatly distorted and cell walls were extensively damaged, particularly at and near the glue line.
Abstract: wood cells and penetration of PVA glue was examined by light microscopy and scanning and transmission electron microscopy. After planing with dull knives the wood cells were greatly distorted and cell walls were extensively damaged, particularly at and near the glue line. In comparison, sharp knives caused much less damage to cell walls and the cells had a normal or near-normal appearance. These features are discussed in detail in relation to glue penetration and the performance of glue joints after planing with sharp and dull knives.
34 citations