Department of Wood Industry, Faculty of Forestry Sciences, Agricultural University, Tirana, Albania
A study was carried out to compare adhesive bonding quality between planed and abrasive planed surfaces of wood. The aim was focused on the issue of reduction of labour cost, equipments and raw material for wood furniture production, referring to experience of some companies which apply sanding process after planning of surfaces to be glued. Beech (Fagus sylvatica L.) and fir (Abies alba Mill.) were selected to be studied. Samples consisted in boards with length 60 cm and width 10 cm, without deformation or wood structure defects. After planning with the same advance velocity, 1/3 of them were abrasively planed with 60-grit size sandpaper and 1/3 was abrasively planed twice with 60 and 100-grit size sandpapers. After, the boards were adhesive bonded with PVA glue, applying 200 gr/m2. Related to angles of annual rings between glued boards, was respected EN 205, 30º ÷ 90º. Pressure was applied with hand grip vice. Time of pressure was 24 hours. The adhesive bonded boards were cut up into test pieces 5 cm length and 2 cm wide. The shear strength of test pieces was measured mean mechanical testing machine. Results showed that shear strength of abrasively planed test pieces with 60-grit size sandpaper of both wood species became short of planed ones, while samples abrasively planed with 60 and 100-grit size sandpapers presented approximately the same resistance.
Keywords: gluing, wood, planning, sandpaper, EN 205.