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APP Tissues International: Onward and Upward in the Global Market, Paper360º November/December 2024

Unlikely Technology Combo KOs Large Suspended Solids, Paper360º November/December 2024

Flocculation of fiber suspensions studied by Rheo-OCT, TAPPI Journal September 2024

ABSTRACT: When dealing with papermaking fiber suspensions, particle flocculation takes place even before the paper web is formed. The particle flocculation depends on several aspects, including particle mass concentration (consistency), particle collisions, electrochemical interactions promoted by chemical additives, etc. Due to its importance, fiber suspension flocculation has been studied for a long time in papermaking, and several methods have been developed for this purpose. The traditional techniques include, for example, focused beam reflectance microscopy (FBRM) and high-speed video imaging (HSVI). Recently, a new optical method, optical coherence tomography (OCT), has emerged for flocculation analysis. The advantages of OCT are the possibility to study opaque suspensions, its micron-llevel resolution, and its high data acquisition speed. The OCT measurements can be combined with rheological (Rheo) measurements, allowing simultaneous measurement of both the time evolution of the floc size and the suspension viscosity. In this work, we used this approach, Rheo-OCT, to study the flocculation of suspensions of various papermaking furnishes. We analyzed the time evolution of the floc size and the fiber suspension viscosity when the studied papermaking suspensions were treated with highly refined furnish (HRF) — a furnish that contained a significant amount of micofibrillated cellulose (MFC)-type fibrils — and/or chemical additives. Such studies can lead to a better understanding of the impact of flocculation on the produced paper web in terms of qualities like formation, drainage potential, and strength behavior.

ASPI News, Paper360º September/October 2024

Nanofibrillated cellulose as a coating agent to improve print quality of synthetic fiber sheets, TAPPI JOURNAL November 2010

Nanofibrillated cellulose as a coating agent to improve print quality of synthetic fiber sheets, TAPPI JOURNAL November 2010

A Tailored Approach to Kaolin Products, Paper360° November/December 2010

A Tailored Approach to Kaolin Products, Paper360º November/December 2010

Using the Measurement of Colloidal Stickies to Meet Industry Needs for Deposit Control â?¢ Part II: Pulp Blending to Paper Machine, Progress in Paper Recycling , November 2010

Using the Measurement of Colloidal Stickies to Meet Industry Needs for Deposit Control • Part II: Pulp Blending to Paper Machine, Progress in Paper Recycling , November 2010

The effect of roller taper on webs, TAPPI JOURNAL November 2012

The effect of roller taper on webs, TAPPI JOURNAL November 2012

From tree cutting to pulping: the impact of storage time on pulp mill economics, TAPPI JOURNAL November 2012

From tree cutting to pulping: the impact of storage time on pulp mill economics, TAPPI JOURNAL November 2012

12NOVPA10

Creating a Monument to Safety, Paper360º November/December 2012