Veneer overdrying is a primary cause of poor plywood glue bond quality due to surface inactivation and its effect on glue transfer and penetration. The goal of this work is to investigate the feasibility of using atmospheric cold plasma to treat overdried hybrid poplar (Populus hybrids) veneers to improve wettability and plywood glue bond (shear) strength. The effectiveness of the plasma treatment using three veneer drying conditions, air drying, oven drying, and overdrying, were compared. It was found that the cold plasma treatment significantly enhanced veneer surface wettability under all three drying conditions. Compared to untreated controls, instantaneous surface contact angles of treated veneers decreased the most under the overdried condition, followed by the oven-dried and air-dried conditions, regardless of whether glycerin or urea formaldehyde (UF) was used. After a 5-s treatment, overdried veneers achieved complete wetting with both droplets. The results demonstrated that the atmospheric cold plasma was the most effective one to treat overdried poplar veneers to achieve the smallest contact angle, leading to the highest plywood glue bond (shear) strength. However, further research is still needed to understand the mechanism of the cold plasma treatment on veneers under different drying conditions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.