Abstract

Phytolacca americana and Tradescantia fluminensis are among the most invasive alien species in Galician riparian forests. Management efforts to control their spread generate large volumes of biomass, which are typically discarded or burned. This study explores the potential of reusing that biomass in papermaking, creating sustainable blends and supporting circular economy practices. Blends were prepared in five ratios (10%-90%, 30%-70%, 50%-50%, 70%-30%, 90%-10%) and processed according to UNE EN ISO standards. The pulp was refined using a PFI mill at 10% consistency (ISO 4149:1996), and drainability was measured via the Schopper-Riegler method (ISO 5267-1), increasing from 26ºSR in 90% P. americana to 38ºSR in 90% T. fluminensis. However, air resistance was highest in the 50%-50% blend, due to fiber structure. Grammage showed minimal variation (SD = 0.0068 g/m²), and thickness remained stable (variation = 0.01597 μm). Color and texture varied with composition, revealing potential for innovative and creative paper applications.