Abstract
Structural characteristics of chemical pulp fibers are irreversibly changed by recycling. The change of the surface behavior of a single pulp fiber during recycling was characterized by measuring the contact angle using appropriate test liquids. A remarkable increase in the contact angle of water was found after recycling. Recycling treatment did not substantially change the surface free energy of the fiber. However, the base parameter of the surface free energy decreased with recycling, particularly that based on free-drying at high temperature.Two types of penetration measurements were designed to measure the rate of vertical (Z direction) and lateral (X-Y direction) liquid penetrations into paper. The rate of water penetration increased with recycling, and correlated with a porous structure in the recycled pulp handsheet. The tortuosity factor for the handsheet was calculated using the Lucas-Washburn equation. The recycled pulp gave smaller tortuosity factors of the handsheet compared with the virgin pulp.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
