Low consistency refining of mixtures of softwood & hardwood bleached kraft pulp : effects of refining power | |
| Author | Nugroho, Dimas Dwi Prasetyo |
| Call Number | AIT Thesis no.PP-12-03 |
| Subject(s) | Wood-pulp--Bleaching Bleached wood-pulp products |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Pulp & Paper Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Effect on the energy effect and the measured properties of pulp and paper was investigated based on different ratios of softwood and hardwood chemical pulps in co-refined blends. A mix of 70-80% lodgepole pine, 20-30% white spruce and 5% sub alpine fir was used as softwood and the eucalyptus as hardwood. The mixtures studied was 0/100, 25/75, 50/50, 75/25 and 100/0 hardwood/softwood at 3.5 % consistency. In the experiment studied here mixtures of hardwood and softwood bleached pulps were refined in a single disk refiner. The plate used was BEL number 2.74 km/rev and the refiner speed was 1200 RPM. Gap size between plates was measured using a sensor from the Lab-view. The different numbers of refining energy were created by changing the gap size between plates at constant flow-rate. The refining flow-rate was 200 l/m. Refining hardwood and softwood together enhance the paper properties such as tensile, burst strength, paper density and drainability but reducing the tear strength, sheet thickness and light scattering coefficient. In order to significantly reduce the refining power, the ratio of hardwood must be 50% at least. We expect that the energy was put into the softwood pulp and resulted in a higher specific refining energy in the softwood fraction. No-load power did not vary with the % hardwood content. Fibre length weighted was reduced after refining due to fibre cutting and fines generation. |
| Year | 2012 |
| 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;Olson, James A.; |
| Examination Committee(s) | Salam, P. Abdul;ShipinOleg V.; |
| Scholarship Donor(s) | PT Riau Andalan Pulp & Paper APRIL Indonesia; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2012 |