03080nas|a2200409 i 4500 20260818143146.0 030124s2002 th u m rtt 00| a1eng d .b11874867 AIT Thesis no. PP-02-5 Zhang, Yumiao Influence of anionic trash on retention and sizing Bangkok : Asian Institute of Technology, 2002 55 leaves Thesis ; no. PP-02-5 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science. Anionic substances originating from pulping or coating processes accumulate in paper machine system and interfere with process chemicals, leading to increasing costs for paper production. The influence of three types of anionic trash on retention and sizing was investigated in laboratory scale. The sources of anionic trash were HW, SW and coated broke filtrate. The stock consisted of 85% HW, 15% SW and 20% PCC filler (on fiber weight). Retention aid was cationic polyacrylamide (C-PAM), and sizing agent was alkyl ketene dimmer (AKD). Effects of adding anionic trash catcher were also studied. Poly aluminum chloride 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. Coated broke filtrate contained much more concentrated anionic trash than HW and SW filtrate, and the way it interfering the retention aid and sizing agent was much 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 coated broke group even with adding PAC. In the case of AKD sizing, water resistance of HW group had a significant improvement due to charge neutralization by PAC. However, PAC showed little effects in SW and Coated broke groups. Thesis (M.Sc.) - Asian Institute of Technology,2002 Paper coatings Additives Paper chemicals Nazhad, Mousa M., Chairperson Retulainen, Elias, Examination committee Ruhanen, Mauno, Examination Committee Government of Finland, Scholarship Donor Asian Institute of Technology, Scholarship Donor Asian Institute of Technology. Thesis ; no. PP-02-5 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B07366 .b11874867 mnait u 240403 0 030124 m a u 0 mnait mnarc 20 40 Barcode : 30050120685309 CREATED : 2003-01-24 RECORD # : i12313695 LPATRON : 1021987 LCHKIN : 2010-05-04 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 3 TOT RENEW : 3 Barcode : 30050160025788 CREATED : 2016-03-18 RECORD # : i12898156 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 60136 60136 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no. PP-02-5 30050120685309 2026-08-18 14:31:46 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. PP-02-5 30050160025788 2026-08-18 14:31:46 2026-08-18 40