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Micael Stehr
Laser Ablation of Machined Wood Surfaces. 2. Effect on End-Grain Gluing of Pine (Pinus silvestris L.)
The effect on glue joint strength of removing the layer of cells on end-grain surfaces of wood damaged by machining?the mechanical weak boundary layer (MWBL)?is presented. The wood surfaces have been laser ablated using different types of lasers of different wavelengths. The goal has been to determine whether or not the strength of end-grain glue joints is influenced by the MWBL and to show how the laser wavelength affects the glue joint strength. All tests were carried out with a PVAc-glue with hardener, and two different glue pressures were used. The joints were tested by bending notched and fatigued specimens. The statistical evaluation of the results shows that one laser gave a significantly higher glue joint strength than the others.
One main conclusion is that the glue joint strength could have been improved with a stronger glue. An ESEM-analysis showed that fracture occurred primarily in the glueline and not in the boundary layer.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 53, 11/1999
Pages: 655 - 661