The Optimization of the Strength of Wood Adhesive Joints Supported by Steel Fasteners in Furniture Components

The strength properties of softwood components with bonded joints reinforced with fasteners were investigated and compared. Initial tests of the strength of the glue joints were carried out with a change in the type of adhesive used. The application method significantly influenced the shear strength of the joint. With the adhesive and pre-bonding systems used, the shear strength of the adhesive joint of pine wood (Pinus silvestris L.) with PUR and PVAC resin was determined. The industrial results were 31% lower than in the shear test of the joint of wood bonded with PVAC glue. In terms of transverse shear force with staples, the joint has a transverse holding force higher than components connected with screws or nails. As the number of glue sticks in-creased, the shear strength of the pine wood increased. The strengths of the joined components in the glue roller method achieved an intermediate value. They did not differ significantly between the two-row gluing systems used. An increase in the force required to shear the bonded joint was observed for the different adhesive systems, the fasteners used and their density.