Quality of LOCC compared with EOCC and measures to improve its papermaking potential | |
| Author | Feng, Minrao |
| Call Number | AIT Thesis no.PP-02-6 |
| Subject(s) | Papermaking Corrugated paperboard |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science. |
| Publisher | Asian Institute of Technology |
| Abstract | The consumption of linerboard has increased during the past decade and it is expected to increase further. This product has a high percentage of recycled materials in its furnish, which influences its strength quality. In addition, the producers located in different areas have different OCC sources and different collecting strategies. Therefore, the OCC properties differ from region to region in strength and some other papermaking qualities. Old Corrugated Container (OCC) collected from local mill (LOCC) was used to study its papermaking quality compared with Europe OCC (EOCC) and American OCC (AOCC). To evaluate prope1ties of LOCC pulp, four sets of experiments were conducted. In the first section, LOCC were compared with EOCC and AOCC to generate a benchmark data for identification of the LOCC through its pulp and fiber properties. In the second scheme, three kinds of OCC were refined to CSF 300 ml, and their papermaking properties were measured and compared. The third scheme was focused on evaluating the board-making quality of recombined pulp (pulp with different percentage of long fiber fraction). In the fourth scheme LOCC pulp was modified by refining, then a two-ply liner was made and compared with a two-ply liner made from the unrefined fractions, but sprayed in joint with starch. It was found that LOCC contains less unbleached softwood Kraft fiber, and more other fiber grades. AOCC has higher long fiber fraction. LOCC and EOCC contained higher contaminants compared with AOCC. LOCC also contains large percentage of acid insoluble ash, while this kind of ash does not exist in AOCC at all. LOCC and EOCC have higher starch contents than AOCC. To achieve the same freeness drop by refining, AOCC require more energy than LOCC and EOCC. At the same revolutions, hand sheets made by AOCC were stronger than those made by LOCC and EOCC in terms of compressive strength. Both LOCC and EOCC samples demonstrate less roughness than AOCC at the same refining time. Hand sheets made by LOCC have slightly better strength properties than EOCC. Low reject rate in fractionation (LOCC was examined only) improves properties of board made in laboratory, this is probably due to higher long fiber share of the fraction. Fractionation shows that fiber length difference is bigger in lower reject rate. Bauer McNett fractionation also suggests that the fines percentage is higher for sho1t fiber fraction. It reduces if reject fraction is increased. Reject rate influenced in strength prope1ties when the fractions were re-mixed. The differences were pronounced when the reject ratio is reduced. The higher the ratio of long fiber in the re-mixed pulp (re-combined long and short fraction after refining the long fiber fraction) the higher was the average fiber length of the remixed pulp. Conversely, increase in long fiber ratio reduced the fines content of the remixed pulp. Strength properties improved if the refined long fiber fraction proportion in the pulp increased, as it was judged based on ring crush and SCT readings. So using high portion of long fiber in the fractions is recommended if compression strength is the main concern. The roughness and formation both surffered with increased share of long fiber fraction. Based on the range examined in this project (0.5% to 3% starch addition), it was found that the addition of starch at joint increases the z-direction strength of two-ply liner (long fiber ply + short fiber ply) made from combination of long and short fiber fractions. Refining of the fractions although increase strength prope1ties including compressive strength, but the z-direction strength remains vulnerable. |
| Year | 2002 |
| 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) | Kolehmainen, Heikki;Retulainen, Elias;Ruhanen, Mauno |
| Scholarship Donor(s) | Government of Finland;Asian Institute of Teclmology |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2002 |