Flexural Modulus of Larch Boards Laminated by Adhesives with Reinforcing Material

Abstract

Economical use of larix (larch) boards (grade 3) in industries is lower than that of imported hardwood; thus, studies have been conducted toward performance improvement of larix boards. Herein, flexural modulus of larix board samples laminated with wood adhesives polyurethane resins, poly (vinyl acetate) resins, phenol-resorcinol-formaldehyde resins, melamineformaldehyde resins, and urea-formaldehyde resins was compared with that of the samples bonded with adhesives reinforced with mesh-type basalt fibers. Moreover, the flexural moduli of the laminated samples bonded by mesh-type basalt fibers were compared with those of reinforced samples. The results showed that boards laminated with polyurethane and urea-formaldehyde resin adhesives had higher flexural modulus than those without the lamination. In particular, the increase in the flexural modulus was relatively significant for the 2-and 3-ply board structures laminated with polyurethane adhesives compared to those with reinforcement. The 3-ply board structure without reinforcement had the highest flexural modulus when the urea-formaldehyde resin adhesive was used.

Evaluation of the Basic Properties for the Korean Major Domestic Wood Species

“…Bending strength KS F 2208 Cha et al, 2022;Darwis et al, 2023;Fujimoto et al, 2021;Hadi et al, 2019Hadi et al, , 2022Iswanto et al, 2017;Kang et al, 2023;Kim et al, 2020;Lee and Jang, 2023;Lee and Oh, 2023;Liu et al, 2022;Maulana et al, 2017;Oh, 2021Oh, , 2022Özcan and Korkmaz, 2019;Park et al, 2015bPark et al, , 2016Qi et al, 2019;Savero et al, 2020;Schulz et al, 2021;Song and Kim, 2023;Sumardi et al, 2022;Trisatya et Huh et al, 2022;Iswanto et al, 2021;Jain et al, 2022;Jung et al, 2019Jung et al, , 2021Jung et al, , 2022Manurung et al, 2019;Maulana et al, 2021;Maulina et al, 2020;Min et al, 2019;Purnawati et al, 2018;Seo et al, 2020 Extractives ASTM E 1690…”

Effect of Ethanol Fractionation of Lignin on the Physicochemical Properties of Lignin-Based Polyurethane Film

“…The mechanical properties, such as hardness and flexibility, can be adjusted by varying the ratio of the polyol and isocyanate groups. In Effect of Ethanol Fractionation of Lignin on the Physicochemical Properties of Lignin-Based Polyurethane Film addition, owing to its excellent durability, toughness, and chemical resistance, it is used in various industrial fields such as coatings, adhesives, foams, films, textiles, and medical care (Das and Mahanwar, 2020;Kim et al, 2002;Lee and Oh, 2023;Li et al, 2017). However, both polyols and isocyanates, the main raw materials of PU, are manufactured in the petrochemical industry and use large amounts of energy in the production process, which leads to environmental pollution issues such as carbon dioxide emissions and resource depletion.…”

Mechanical Properties of the Oriented Strand Board (OSB) Distributed in the Korean Market

“…In addition, it is thought that the import target country has shifted to those in the Asian region as competition in OSB prices has increased owing to the supply and demand of raw materials, expansion and improvement of the use of no-added formaldehyde (NAF) resin adhesives, and optimization of the manufacturing process. Alternative materials to replace OSB have been sought, and efforts have been made to enhance the physical properties of wood-based panels (Ahn et al, 2021;Cahyono et al, 2020;Hwang et al, 2021;Lee and Oh, 2023;Setyayunita et al, 2022).…”