The impact of lignin on recycling potential of paper | |
| Author | Aye Aye Mon |
| Call Number | AIT Thesis no. PP-99-7 |
| Subject(s) | Lignin Waste paper--Recycling |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Chemical and mechanical pulps behave differently during recycling. Recycling deteriorates papermaking quality of fiber produced by chemical process. This was attributed to the loss of lignin from the cell wall. It was rationalized that lignin free cell wall is susceptible to hornification due to extensive hydrogen bonding between the microfibrils. Lignin has very poor bonding potential, while the bonding potential of hemicelluloses and cellulose is enormous. So, it was easy to conclude that the presence of lignin is a major obstacle for extensive hydrogen bonding between the microfibrils. The main support for this reasoning was the behavior of mechanical pulp during recycling. It was repo1ted that the quality of paper produced from mechanical pulp either improved or remained the same at the course of recycling. However, the lignin proposal on recycling potential of fiber has never been tested in practice. The present work was developed to examine the role of lignin on recycling potential of fiber. CTMP (Canadian) pulp was used as a starting material. The lignin was removed at the sequences of 20%, 40%, 60%, 80% and 100% respectively. The recycling potential of the samples at different degree of delignification was tested and compared. It was concluded that elimination of lignin as low as 20% from the cell wall reduces recycling potential of the fibers. However, a specific answer for the role of lignin on recycling potential of fiber is still unresolved. |
| Year | 1999 |
| 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) | Nazhad, Mousa M.; |
| Examination Committee(s) | Malinen, Raimo 0. ;Kolehmainen, Heikki ; |
| Scholarship Donor(s) | Government of Finland ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1999 |