Enhancing mechanical properties of particleboards using plasma treated wood particles

Abstract

The surface properties of wood particles are one of the key factors for the development of mechanical and physical properties of particleboards. Particles were treated with plasma at atmospheric pressure with ambient air in order to enhance the polarity of wooden surfaces. One-layer particle boards were produced from the plasma-treated particles by using 3, 5, and 8 % urea formaldehyde adhesive (related to the particles). For all adhesive ratios, internal bond strength was increased by approximately 0.1 MPa compared to the respective controls. The modulus of rupture, modulus of elasticity and water related properties were only improved compared to the respective controls at the lowest adhesive content. It is therefore concluded that the plasma treatment can improve the bonding quality and water related properties of particleboards particularly at low adhesive contents

Enhanced urea-formaldehyde adhesive spreading on plasma treated wood particles

“…2c, d). This effect of plasma is in accordance with results from previous studies on conventional particleboards (Altgen et al 2015). It was previously reported that mechanical properties of particleboards are enhanced with decreased droplet size (Wilson and Krahmer 1976).…”

“…The particles and veneers were treated for 1 s with a rotary cylindrical electrode, using 12.5 Ws/cm 2 and ambient air as process gas as described previously (Altgen et al 2015).…”

“…Plasma treatment has successfully been applied previously to various solid wood surfaces in order to change their surface wettability (Avramidis et al 2009). A recent study reported on enhanced mechanical properties of particleboards made of plasma treated wood particles at low adhesive contents (Altgen et al 2015). It is assumed that these improvements are due to changed adhesive distribution on the wood particle surfaces.…”

The influence of raw material growth region, anatomical structure and chemical composition of wood on the quality properties of particleboards

“…Many investigations have been carrried out on the influence of raw material and production factors on the quality characteristics of particleboards. These factors studied are cutting tool geometry, crushing conditions, particle compaction, fine screen usage, and press closing time (Hızıroglu andGraham 1998, Hızıroglu et al 2004), the use of wood bark and pine cone (Balanchet et al 2000, Ayrılmıs et al 2009, formaldehyde/urea mole ratio, resin level, catalyst level and composition, post treatment and formaldehyde scavengers (Que et al 2007), utilization of bagasse (Ghalehno et al 2011), residue type and tannin content (Moubarik et al 2013), pressing parameters such as times, temperatures, and pressures (Boon et al 2013, Liu et al 2015, the use of plasma treated wood particles (Altgen et al 2015), log position (Muhcu et al 2015), utilization of bamboo and rice husk (Melo et al 2015), utilization of reed stem and canola (Brassica napus) straws (Kord et al 2015, Kord et al 2016, and the use of cotton (Gossypium hirsutum) stalks (Nazerian et al 2016).…”

Enhancing the water repellency of wood surfaces by atmospheric pressure cold plasma deposition of fluorocarbon film

“…9 These major effects drive the application of plasma treatments for different goals, such as antifouling properties, 10 biocompatibility, 11 superhydrophobicity, 12 improving surface adhesion, 13,14 oxygen barrier properties 15 and antibacterial properties. 16 The application of plasma in wood and wood-based materials involves two main goals, the improvement of surface adhesion [17][18][19][20][21] and the deposition of low surface energy thin lms to increase the barrier properties against polar and non-polar liquids and gases. The deposition of low surface energy lms on the wood surface is relatively well understood in low-pressure plasma reactors from the many reports published, which mainly use siloxanes, uorine and alkanes as precursors.…”