7/20/2023 0 Comments Last wood researchTheir global popularity and production have seen an upward trend in recent years. Īlongside plywood, particleboards are another major wood-based product in global trade. Alongside flax fibers, several natural fibers such as hemp or kenaf, or synthetic fibers such as carbon have shown very good potential in increasing the mechanical properties of veneer-based products. Research in the area of fiber reinforcement used for veneer-based products has become recently very popular. As the authors concluded, further research is mandatory to determine the influence of press parameters, in addition to factors such as veneer and flax fiber manufacturing, and pre-treatment of the flax fiber. Polyurethane was the last tested adhesive system that showed the lowered mechanical properties of flax fiber-reinforced plywood. On the other hand, the tensile strength was lowered in the case of these adhesive systems. Epoxy resin showed excellent properties in the case of flax fiber reinforcement, while urea-formaldehyde, melamine urea-formaldehyde, and isocyanate MDI prepolymer helped improve the modulus of elasticity, modulus of rupture, shear strength, and screw withdrawal resistance. Epoxy resin, urea-formaldehyde, melamine-urea formaldehyde, isocyanate MDI prepolymer, and polyurethane had a different role in improving its mechanical properties. focused on using adhesive systems for flax fiber-reinforced beech plywood. Another piece of research conducted by Jorda et al. The authors have concluded that the proposed Quebracho tannin and furfural formulation can improve and contribute to recyclability for specific interior plywood applications as a key element of the bio-based circular economy. The prepared fully bio-based adhesive formulation showed good viscosity and curing behavior at a relatively low temperature (100 ☌), good bending, and acceptable tensile shear strength in a dry environment, which was comparable to industrial applicated PF adhesive. They investigated its usability as an adhesive for five-layered beech (Fagus sylvatica L.) plywood, detailing its press parameters and their influence on its physical and mechanical properties. focused their research on bio-based adhesive formulation consisting of Quebracho tannin extract and furfural. Increased interest in developing sustainable adhesives from different renewable biomass feedstock focuses mostly on lignin, tannin, starch, and proteins. Recently, increased amounts of biobased adhesives have been used in the production of wood composites to meet the current need for the development of sustainable and innovative materials which will make the wood-based panel industry more sustainable and lower its dependence on fossil fuels. Along with their numerous advantages, such as chemical versatility, high reactivity, and excellent adhesive performance, these adhesives are characterized by certain problems, and connected with hazardous volatile organic compounds (VOCs). Traditional wood-based panels are produced with synthetic, formaldehyde-based adhesives that are commonly made from fossil-derived constituents, such as urea, phenol, melamine, etc. Wood adhesives are becoming more popular as the need for wood-based panels grows. Over the last 50 years, the use of wood adhesives in the manufacturing of wood-based panel goods has increased the efficiency of wood resources.
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