Improving the Physical and Mechanical Performance of Laminated Wooden Structures by Low-Temperature Plasma Treatment

Abstract

This paper considers the effect of RF plasma on wood in improving the adhesion of binders to wood by increasing its surface wettability. Our study reveals that radiofrequency (RF) plasma treatment causes a greater than threefold decrease in the marginal wetting angle of wood. The greatest effect is achieved in RF plasma treatment in argon, which is on average 5% greater than that of RF plasma treatment in air or in propane/nitrogen mixture. In addition, the power of the RF plasma torch has the greatest influence, and the main influence comes from the voltage applied to the RF plasma torch; current does not have such a significant effect. To achieve a significant effect, the duration of exposure should be at least 5 min, with a total power of 4.05 kW.Studies have been conducted to determine the adhesive strength of wood. An increase in the strength of laminated beams made from RF-treated bars in relation to control samples was found. The greatest impact on the adhesion strength was revealed when using PVA-based glue, compared with the use of polyurethane-based adhesives and urea-formaldehyde resin.

Effects of Plasma Treatment on the Surface Characteristics and Bonding Performance of Pinus massoniana Wood

“…The minimum diffraction peak was at 2θ = 18°, deno scattering intensity of the diffraction peak in the non-crystalline region (Iam) [49fore and after plasma treatment of PM wood, the diffraction angle of I002 crystal pl 22.47°, indicating that plasma treatment had no significant effect on the positio diffraction peak in the crystalline region, and that the distance of crystal layers changed. The crystallinity before treatment was 45.82% and after treatment was indicating the increase in the crystallinity of cellulose was another reason for provement in the bonding strength after plasma treatment [9,[52][53][54].…”

“…Before and after plasma treatment of PM wood, the diffraction angle of I 002 crystal plane was 22.47 • , indicating that plasma treatment had no significant effect on the position of the diffraction peak in the crystalline region, and that the distance of crystal layers was not changed. The crystallinity before treatment was 45.82% and after treatment was 51.21%, indicating the increase in the crystallinity of cellulose was another reason for the improvement in the bonding strength after plasma treatment [9,[52][53][54].…”

Physicochemical Surface Treatment of Wood Raw Materials

“…An article titled "Improving the Physical and Mechanical Performance of Laminated Wooden Structures by Low-Temperature Plasma Treatment" [9] provides the results of a study of high-frequency plasma effect on the surface of wood samples, in order to increase the adhesion of binders to wood by increasing surface wettability. It was established that low pressure RF discharge treatment gives wood new combinations of properties without changing the chemical composition: increased pore size results in increased wood wettability.…”