| Author | Dao Thi Phuong |
| Call Number | AIT Thesis no.PP-04-12 |
| 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 |
| Series Statement | Thesis ; no. PP-04-12 |
| Abstract | Repeated recycling often leads to extremely weak, slowly draining fiber. Japan and some
European are regions, which have the highest in recycled fiber consumption. To render the
strength of secondary fiber, refining, fractionation and chemical additive are the main
methods, which use in practical paper and board mills.
Japanese OCC (JOCC) was collected from local mill in original form then re-pulped in the
laboratory. The pulp was divided into two parts. One part was treated with sodium
hydroxide cationic starch. Other was fractionated into long fiber and short fiber fractions.
Then long fiber fractions were refined with and without sodium hydroxide soaking and remix
with shmt fiber at the same original mass ratio. The strength properties of all samples
were measured and compared with refined feedstock at the same freeness value.
Caustic soaking was carried out using optimum condition (2% chemical charge on O.D
pulp, 4hrs at 60°C). Caustic soaked pulps have lower initial freeness and required lower
refining time. Caustic soaking increased internal bonding by 30%, but its effect on other
properties is minor. The caustic soaking had increased tensile strength and SCT strength
5% and 10% respectively
Caustic soaking of the long fiber fraction after fractionation did not show significantly
influence on strength prope1ties.
Cationic Starch was added as a dry strength form before dilution stage in handsheet
making. It did improve the strength prope1ties significant. At 2% starch charge, an increase
of 26% in tensile strength and 18% in SCT strength was observed. |
| Year | 2004 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Pulp and Paper Technology (PP) |
| Chairperson(s) | Nazhad, Mousa M. |
| Examination Committee(s) | Kolehmainen, Heikki;
Lehtinen, Esa;
Malinen, Raimo O. |
| Scholarship Donor(s) | Government of Netherlands;AIT Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2004 |