Micro-mechanical modeling of the paper compaction process

Abstract Double-roll compaction is a process to create extensible paper and paperboard suitable for replacing plastic in 3D forming applications. Understanding the macro- micro-mechanisms governing allows increasing stretch potential while maintaining sufficient strength bending stiffness. In this work, we approach of with micro-mechanical methods featuring unprecedented level details otherwise inaccessible currently available experimental tools. The loading scheme based on experiments continuum simulations. different levels their continuous impact fibers’ geometry, void closures, irreversible deformation fibers are thoroughly characterized. We find that structural changes concentrated oriented within 30 degrees direction compaction. accumulates primarily wall form strains. spring-back effect beyond negligible. For first time, role normal frictional fiber-to-fiber interactions investigated quantified. interaction between has surprisingly low outcome process, dominant response. consequence finding potentially limited surface modifications targeting friction.