Fibre-Based Strength Aids for Increased Board Stiffness, 19PaperCon
In this trial the concept of adding fibre based strength agents in a board middle ply containing CTMP was evaluated in pilot scale. The goal was to produce a board with increased bending stiffness at maintained Z-strength. The approach was to increase the bulk in the middle ply by increasing the CTMP share, and to add a strength agent made from chemical pulp to maintain the Z-strength. Two different types of strength agents were compared: fines enriched (FE) pulp produced in a process involving a screening step, and highly refined (HR) pulp produced in an alternative process not relying on screening. It was demonstrated that the bending stiffness could indeed be improved by increasing the CTMP share of the pulp and adding a small amount of either FE or HR pulp. At the same addition level, FE pulp was found to increase bending stiffness more than HR pulp, whereas the latter yielded higher Z-strength. The difference in the effects observed when adding HR and HF pulp was relatively small, suggesting that further development of the HR production process should allow FE pulp to be produced without the screening step.
TAPPI conference proceedings and presentations, technical papers, and publication articles provide technical and management data and solutions on topics covering the Pulp, Paper, Tissue, Corrugated Packaging, Flexible Packaging, Nanotechnology and Converting Industries.
Simply select the quantity, add to your cart and your conference paper, presentation or article will be available for immediate download.
Fibre-Based Strength Aids for Increased Board Stiffness, 19PaperCon