Improved absorption characteristics of thermally modified beech veneer produced by plasma treatment

Abstract

In dieser Arbeit wird der Effekt eines Plasmas unter Atmosphärendruck nach dem Prinzip der dielektrisch behinderten Entladung auf die Benetzungs- und Absorptionscharakteristik von thermisch behandelten Buchenholzfurnieren untersucht. Ein einfacher Immersionstest unter Verwendung von Wasser und Melaminlösung wurde ausgeführt und zeigte eine verbesserte Benetzung und Flüssigkeitsaufnahme nach einer Plasmabehandlung. Die Bestimmung des WPG (weight percent gain) bestätigte einen erhöhten Melamingehalt nach einer Plasmabehandlung

Changes of wettability of medium density fiberboard (MDF) treated with He-DBD plasma

“…Furthermore, hydrophilicity can also be improved (Avramidis et al 2012;Tang et al 2012;Zheng et al 2012) through introduction of hydroxyl and carbonyl groups on a thin surface layer (Asandulesa et al 2010). …”

Plywood made from plasma-treated veneers: melamine uptake, dimensional stability, and mechanical properties

“…The veneer sheets were transported centrally by a roll-conveyer through the gap (5 mm) between two electrode arrays. Each electrode array consisted of 5 single electrodes of rectangular Al 2 O 3 tubes (15 9 15 9 400 mm 3 , t = 2.5 mm) filled with bronze powder with a distance of 5 mm between the single electrodes [27], similar to the setup used in [21]. Two radial fans above and below the electrode arrays generated an ambient air stream towards the electrode arrays (cooling and discharge homogenization).…”

“…Plasma-based modification of wood surface using air as the process gas is known to improve wetting characteristics [13][14][15], which enhances the adhesion of coatings and adhesives [16][17][18][19]. Additionally, the uptake characteristics of wooden materials for water and waterbased modification agents are positively affected by plasma modification [20][21][22][23] as well as the penetration depth of adhesives applied to pre-treated wood surfaces [24]. Chen et al reported an increase in the adhesive strength of plywood made of plasma-treated poplar veneers [25].…”

Nanocomposite coatings and plasma treatments for wood-based products

“…In most cases, the goal was to improve the adhesion of a polymeric based coating in a composite product (Carlsson and Ström, 1991;Felix et al, 1994;Sakata et al, 1991). Various studies have since investigated the surface wettability of wood from several species treated through reduced-pressure plasmas (Aydin and Demirkir, 2010;Abbasipour et al, 2012;Acda et al, 2012) and, more recently, atmospheric DBD plasmas (Wolkenhauer et al, 2008Odrášková et al, 2008;Avramidis et al, 2009Avramidis et al, , 2011Avramidis et al, , 2012Sakata et al, 1993;Topala and Dumitrascu, 2007;Lukowsky and Hora, 2002;Wielen et al, 2005). Their work showed that Douglas and Colorado fir exhibited increased permeability when exposed to N 2 , but this modification did not prove permanent due to the migration of extractives to the treated surface over time.…”