Document Type : Research Paper

Authors

• Behzad Hosseini ¹
• mohammad ghofrani ²
• Hamid Reza Taghiyari ³
• Saman Ghahri ⁴

¹ M.Sc., Woodand Paper Science and Technology Department, Faculty of Natural Resources, Wood and Paper Planet Responsible, Noor, Iran

² head of the department of E-learning

³ Associate Prof., Wood Science and Technology Department, Materials Engineering & New Technologies Faculty, Shahid Rajaee Teacher Training University, Lavizan, Tehran, Iran

⁴ Department of wood and paper sciences, Faculty of natural resources, Tarbiat Modares University, Iran

Abstract

In this research, Effect of soy flour addition into urea-formaldehyde resin on physical, mechanical properties and formaldehyde emission of plywood was investigated. Soy flour was mixed with urea-formaldehyde adhesive in three levels 5, 10 and 15% (based on dry weight of urea-formaldehyde adhesive) and three-layer plywood was manufacture from the resultant adhesive and poplar veneer. Properties of manufactured plywood including formaldehyde emission according to EN-717-3 standard, shear strength according to EN-314 standard and water absorption and thickness swelling according to EN-317 standard were investigated. The results indicated that addition of soy flour up to 15% decreased formaldehyde emission up to 29.34% and increased shear strength of panels. Moreover, delamination test (According to ANSI/HPV-HPV1 Standard) presented acceptable results. The results obtained from water absorption and thickness swelling after 2h and 24h showed that addition of soy flour increased the amount of water absorption and thickness swelling.
thickness swelling after 2h and 24h showed that addition of soy flour increased the amount of water absorption and thickness swelling.

Keywords

• Soy flour
• Urea-formaldehyde
• Plywood
• Shear Strength
• Delamination

Main Subjects

• Composite wood products