A model to predict the optical and strength properties of co-refined pulps | |
| Author | Navaee-Ardeh, Shahram |
| Call Number | AIT Thesis no.PP-05-09 |
| Subject(s) | Wood-pulp--Refining Paper--Optical properties Strength of materials |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Separate and mixed refining was carried out by Escher-Wyss refiner on birch, spruce and pine pulps. The condition of refining was set according to the predicted specific refining energy and specific edge load from UBC co-refining model. The sampling of the refined pulps was made at four desired points (four equal intervals of SRE/SEL) of specific refining energy. All fiber analysis, sheetmaking and testing were conducted on the individual, separate and co-refined pulps. The experimental nonlinear multi-variable modeling, AIT model, was applied on the tear, tensile and z-direction internal strengths and light scattering coefficient. The least square method in MATLAB software was used for the modeling. The models were made based on two independent variables: Furnish specification number (FSn) and SRE/SEL. The significance of the models was investigated. The agreement between the experimental tear strength and the one predicted by AIT model was reasonably good, however the model predicted tensile and z-direction internal strengths and light scattering coefficient very well. The application program of the models was written in MATLAB. Furthermore, the verification of UBC co-refining model was performed. The agreement between strength properties of the separate and co-refined pulps was better than optical properties. Collaboration of the two models; i.e. UBC model and AIT model, were considerably vital in order to predict the refining conditions for some specific requirements of the end product. Finally, the graphical optimization of specific refining energy for achieving a reasonable tensile and tear was performed. From this optimization it was found that regardless to the set of pulp the optimum refining energy was 74 k Wh/t. |
| Year | 2005 |
| 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. ; Kerekes, Richard |
| Examination Committee(s) | Lehtinen, Esa ; Malien, Ramio O. |
| Scholarship Donor(s) | Government of Finland ;AIT Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |