EFFECTS OF THE SIZE DISTRIBUTION OF PREFLOCCULATED GCC ON THE PHYSICAL PROPERTIES OF PAPER
To evaluate the effect cationic polymers on the size and size distribution of preflocculated GCC and their shear stability, cationic PAM and cationic starch were used. The influence of the preflocculation on filler retention and its surface distribution, and the changes of physical and optical properties of handsheets affected by the characteristics of preflocs were examined. Filler distribution on sheet surface was also analyzed by EPMA. Results showed that cationic PAM formed large preflocs at low dosage. Cationic starch was required to add 15 times as much as cationic PAM to obtain the preflocs with similar size. But preflocs formed with cationic starch was superior in shear stability to those formed with cationic PAM. Filler preflocculation technology could provide an opportunity of increasing filler content significantly without loss in tensile strength. And increased filler contents could compensate brightness loss which often accompanies filler preflocculation. When excessively large preflocs were used, however, brightness loss rather than the improvement in tensile strength was predominant. Therefore it is of great importance to produce preflocs with proper size and shear stability for maximizing the improvement of physical properties of papers.
preflocculation filler PAM
Lee Hak-Lae Youn Hye-Jung Lee Kyong-Ho
Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University, Seoul, 151-921, South Korea
国际会议
广州
英文
472-477
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）