Effect of harvesting age of Eucalyptus camaldulensis on both wood extractives and papermaking properties | |
| Author | Nucharin Luangsa-Ard |
| Call Number | AIT Diss. no.PP-09-02 |
| Subject(s) | Eucalyptus camaldulensis Wood-pulp industry |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Technical Science in Pulp and Paper Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. PP-09-02 |
| Abstract | Main objectives in this thesis were to study the e ffects of harvesting age on wood extractive compositions and to study the diffe rence of wood extractiv es between area in growing tree with tylose and without tylose formation and the effect on pulp and paper properties. Trees used in this study were 6, 8, 10 and 12 year s old. Basic densities of the whole wood and each growth ring se em to increase with tree ag e. Age of the tree seems not to affect the lignin content of the wood. Within the variation of tree samples, extractives level decreased from pith to bark, lipophilic extractives and tylose formation gradually decreased in a respective way. Microscopic analysis using wood cross cutting sections shows that there was no tylose formation in ou ter growth rings, but clear tylose formation could be observed in inner growth rings. Phe nolic compounds seem to reach highest level in the middle growth rings from 4-6 to 7-9 ye ars. The older trees ha ve longer and coarser fibers than the younger trees. The percentage area cove red by parenchyma cells had tendency to increase from pith to bark wh ile the area covered by fibers had tendency to decrease from pith to bark. Lumen sizes d ecreased in both with increasing tree ages and within tree variation (from pith to bark). Fi ber wall thickness has tendency to increase with increasing tree age and to increase from pith to bark. For cooking yi elds, the 8 years old wood gave the highest cooking yield while the 12-year-old gave the lowest cooking yield. In the bleaching sequence of D 0 E op D 1, the oxygen delignified pulp of 6 year old wood gave the highest brightness. After th e final bleaching stage, the brightness level of 85 % ISO for all pulp samples was obtained. Pulp from 6 year old tree gave the de nsest sheet while the pulp from 12 year old tree gave the bulkiest sheet at all beating levels. The surface roughness increased with increasi ng tree age. The optical pr operties (light scattering, opacity) were steadily reduced after 6th growth year. |
| Year | 2009 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. PP-09-02 |
| Type | Dissertation |
| 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) | Viljakainen, Esa |
| Examination Committee(s) | Malinen, Raimo O. ;Preeda Parkpian ;Sawitree Pisuttipiched |
| Scholarship Donor(s) | Finland ;Asian Institute of Technology Fellowship |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 2009 |