Effects of process, wet and variables on Alum - Cationic Rosin sizing & comparison with PAC - Cationic Rosin and AKD sizing | |
| Author | Ma Tien Chuong |
| Call Number | AIT Thesis no.PP-10-04 |
| Subject(s) | Paper--Wet strength Papermaking |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Pulp and Paper Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. PP-10-04 |
| Abstract | The p urpose of this study was to investigate the effects of process and wet -end variables on internal sizing system of Alum and Cationic Rosin and compare about cost effectiveness of the system with other ones: PAC -Cationic Rosin and AKD , aslo between systems u sing different chemicals to control pH (Alum, H 2 SO 4 , HCL) . In addition, bas ing on understanding gained from above , the recommendation for a particular case ( Thai Kraft Paper Industry Company Limited –TKIC) was also brought out. The thesis was carried out in lab oratory scale with methods used popularly in Pulp and Paper Technology field . The results of the study were that at a pH value, there was a optimal ratio between Alum and Rosin considered as enough for sizing. Using other ratios could lead to overus e one of these chemicals. At pH of 5, the ratio was 1.5. It was found that high values of either pH or conductivity had a negative impact on sizing efficiency. And high values of hardness, ratio between concentration of SO 4 2- and Al 3+ were also but limited . Lasting the equilibration time could result in lower Cobb values . One more conclusion was that at higher pH, the more rapid reduction of cationic charge of Alum was at higher temperature. The results also revealed that using other acids to control pH ins tead of using alum gave much better sizing efficiency . And using Alum -Rosin sizing system at its optimal conditions was still much more cost effectiveness than PAC -Rosin at higher pH or AKD at neutral or alkaline ambient. The principal conclusion was that Alum -Cationic sizing system could work quite well at high pH (until pH of 6.5) only when stock temperature was low (<45 o C). And a t higher temperature , this system only remained sizing efficiency when working at lower pH (<5.5) . |
| Year | 2010 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. PP-10-04 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Pulp and Paper Technology (PP) |
| Chairperson(s) | Nazhad, Mousa M. |
| Examination Committee(s) | Helle, Torbjorn;Bharti, Shashank |
| Scholarship Donor(s) | Siam Cement Group Foundation |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2010 |