Heat Resistance of Glued Finger Joints in Spruce Wood Constructions

• Main Authors: Martin Sviták, Miroslav Gašparík, Jan Penc
• Format: Article
• Language: English
• Published: North Carolina State University 2014-10-01
• Series: BioResources
• Subjects: PUR adhesive; MUF adhesive; Temperature; Bending strength; Modulus of elasticity; Spruce wood; Heat resistance
• Online Access: http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_09_4_7529_Svitak_Heat_Resistance_Glued_Finger

The heat resistance of glued spruce wood was evaluated for different joint types and adhesives. Bending strength, modulus of elasticity, and also fracture evaluation were investigated on glued spruce samples made by the finger-jointed principle. Finger-jointed samples were glued with polyurethane (PUR) and melamine-urea-formaldehyde (MUF) adhesives. Heat loading was realized at temperatures 60, 80, and 110 °C and compared with wood with 20 °C. A static bending test with four-point flexural test was used. Elevated temperature and adhesive type had an important influence on the bending strength. On the other hand, adhesive type had a significant influence on the modulus of elasticity, but elevated temperature had no substantial influence.