Regenerated fiber quality enhancement

In recent years, the use of recycled fibers in the production of linerboards, corrugated base papers, tissue papers and newsprints has seen a drastic increase, but the use of recycled fibers is often limited by its quality. This article describes alkali treatment, oxygen treatment, added polymer treatment, and results.
In the alkali treatment study, the amount of alkali added is 3% of the waste corrugated container (0CC) slurry, and the fiber bonding strength is most greatly increased, which can be reflected by the burst strength, tensile strength, bending strength, and compressive strength of the slurry. come out. If the beating conditions are properly controlled, the ring pressure strength of the slurry is also significantly changed. It seems that when the amount of alkali is low, the treatment is the best and the most reasonable. After the alkali treatment, the polymer is added. If guargum and cationic starch can improve the fiber binding strength, the effect is better than the simple alkali treatment. Adding a polymer is particularly effective for improving the crush strength and compressive strength of the slurry. In the oxygen treatment study, the Oxygen addition of 2% alkali was the best for OCC paddles, with only a loss of yield within the allowable range. Oxygen treatment increases pulp strength more than simple alkali treatment. The effect of alkali treatment after oxygen bleaching is also not good, but adding the polymer after oxygen bleaching still maintains a good effect. In summary, alkali pretreatment favors the swelling and softening of the regenerated fibers. Oxygen treatment under alkaline conditions can achieve greater strength improvements, but the yield is reduced. Oxygen treatment and the addition of polymers seem to be the best choice.