Study On Gluing Technics And Gluability Of Populus×Canadensis Cv.'I-214' And Cunninghamia Lanceolata Wood

Commencing with adhesive selection, gluing technics improvement and different gluing treatments, experiments implementing by Orthogonality and SAS statistical methods, the research focus on wood surface condition, gluability and durability of glued Populus×canadensis cv.'I-214' and Cunninghamia lanceolata Wood. Glue shear strength, wood failure and glueline delamination were measured according to JAS MAFF, Notification No.992. The relation between wood technics and wood gluability was analysed based on wood properties and characteristics of these two eucalyptus species. 1. When the surface quality is evaluated by roughness, the roughess value of Poplar and Chinese Fir is 9.13μm and 5.29μm respectively. The surface quality of Poplar is better than that of Chinese Fir.2. Experimentally, API shows the best glue shear strength and higher wood failure in dry and wet glueline compared with PVAc, UF and PF, especially in Chinese Fir. Poplar and Chinese Fir are with the shear strength of 2.56MPa and 3.39MPa in their dry glueline test, 1.57MPa and 3.13MPa in the wet glueline experiments, respectively. 3. Poplar shows good wet shear strength of 2.96 MPa, 2.76 MPa and 2.46MPa at pressure 2.0MPa, pressing time 60min and glue spreading 150g/m2, respectively. Chinese Fir shows good wet shear strength of 2.08 MPa, 1.96 MPa and 2.15MPa at pressure 1.5MPa, pressing time 50min and glue spreading 190g/m2, respectively. 4. In different grain experiment, the bonding property of tangential to tangential is better than other combination, and the shear strength of Poplar and Chinese Fir is 3.92 MPa and 2.03 MPa in dry glueline. It illuminates a compact integration between API and wood by SEM and microscope, and have an evenly glueline of 3~5 layer cells. Adhesive can penetrate into eylem ray at tangential to tangential or radial to tangential bonding.5. The gluability of Poplar can be improved through wood surface treatments. By contrast, the newly planed wood has the best results, (Poplar show an increasing bonding shear strength and wood failure from 3.16MPa and 96% to 5.44MPa and 100%, respectively). The gluability of Chinese Fir can hardly be improved through wood surface treatments, whereas it takes on reverse effect experimently.6. The part of experiment data is seached by computer in programme, and the result is satisfacted. Because the data is insufficient, so the range of application is limitted. The used field will be extending in future.