Influence of Upcycled Post-Treatment Bark Biomass Addition to the Binder on Produced Plywood Properties

The valorization of tree bark through chemical treatment into valuable products, such as acid, leads to the formation process residues with a high solids content. Since they are natural origin and able be suspended in water research was carried out on recycling suberic acid (SAR) bi-functional component binder mixtures production plywood. 5%–20% (5%–30% for curing time) mass content SAR has been investigated urea-formaldehyde (UF) resin about 66% dry results show that time bonding mixture can reduced 38% 10%, respectively, hot cold curing, initial lowest decreasing tested increase caused by increasing amount acidic filler, since amine resins UF require acidification hardening, dynamics strongly dependent, among others, medium (curing agent). In case 20% allowed us achieve an industrial hardener. Investigations mechanical properties examined panels showed significant modulus elasticity (MOE) filler increase. Similar conclusions drawn when analyzing rupture (MOR) investigations; however, these were only regarding hot-pressed samples. shear strength plywood samples increased rise both cold- panels. in-wood damage hot-pressed, rose up 30% highest For cold-pressed samples, no found. positive effect veneer impregnation limiter identified acting filler. Moreover, higher density SAR-containing lines reached Therefore, confirmed ability use upcycled production.