| Author | Afrose, Farzana |
| Call Number | AIT Thesis no.PP-07-6 |
| Subject(s) | Paper coatings
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Pulp and Paper Technology |
| Publisher | Asian Institute of Technology |
| Abstract | The objective of this study was to find out the effects of different Carboxy Methyl Celluloses on the rheological properties of coating color and coated paper with kaolin clay and ground calcium carbonate used as pigment. Main difference between different CMCs was molecular weight: 20000 (CMC-1), 50000 (CMC-2), 80000 (CMC-3). From the results, it has been found that increasing amount of CMC from 0.5 pph to 0.9 pph increases viscosity of both kaolin and GCC. CMC-1 does not show any prominent influence like CMC-3 on both the pigments. Viscosity of pure kaolin (ds-60%) is lower than that of pure GCC and blend (ds-66%) and in that case viscosity increases with increasing the percentage of GCC for three grades of CMC. CMC-3 gives good water retention in case of kaolin while in case of GCC it's CMC-1 that gives the better result with increasing dosage. GCC gives the worst water retention whatever be the nature of CMC. On the other hand, light scattering coefficient and opacity increases upto a certain addition of CMC,s then it declines when the higher dosage is added. CMC improves brightness a little amount for both the pigments where CMC-3 declines the trend in case of GCC. CMC deteriorates the surface properties such as gloss and also print gloss in case of kaolin. It has been observed that CMCs show excellent IGT surface pick resistance for interaction with kaolin. Due to bulkier coating, better coverage and smoother coated surface, GCC show lower pick resistance than kaolin. CMC gives high dry solid coatings with GCC while at the same time it deteriorates the surface properties of coated paper with kaolin. |
| Year | 2007 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| 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) | Lehtinen, Esa; |
| Examination Committee(s) | Malinen, Raimo O.;Nazhad, Mousa M. |
| Scholarship Donor(s) | Finland;AIT Fellowship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2007 |