INFLUENCE OF ANIONIC TRASH ON RETENTION AND SIZING
The influence of three types of anionic trash on retention and sizing was investigated. The sources of anionic trash were hardwood (HW), softwood (SW) and coated broke (CB) filtrates. The stock consisted of 85% HW, 15% SW and 20% PCC filler (g/g). Retention aid was cationic polyacrylamide (C-PAM), and sizing agent was alkyl ketene dimmer (AKD). Effects of adding anionic trash catcher (ATC) were also studied. Poly aluminum chloride (PAC) was preferred as an anionic trash catcher due to its superior charge neutralizing ability. It was found that the existence of anionic trash influenced both retention and sizing. CB filtrate contained much more concentrated anionic trash than HW and SW filtrate, and the way it interfered retention aid and sizing was more complicated. PAC was effective in the case of neutralizing the anionic trash from HW and SW filtrate. No significant improvement of retention could be seen in the case of CB filtrate even with addition of PAC. In the case of AKD sizing, water resistance of the samples using Hw filtrate had a significant improvement due to charge neutralization, but PAC was ineffective in the case of SW and CB filtrates.
hardwood softwood coated broke
Zhang Yumiao Mousa M. Nazhad
Pulp and Paper Technology, Asian Institute of Technology, Thailand
国际会议
广州
英文
462-465
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）