| Author | Nguyen Thanh Tam |
| Call Number | AIT Thesis no.PP-01-2 |
| Subject(s) | Newsprint--Recycling
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Science, School of Environment, Resources and Development
|
| Publisher | Asian Institute of Technology |
| Abstract | Recycled newspaper is a very important raw material for newsprint. During the time prior to
deinking, the old newspaper needs to be collected, transported, and stored. The storage
(aging) condition affects its deinking potential. The goal of this study was to understand how
the storage (aging) condition of old newspaper (ONP) influents its deinkability.
The effect of storage (aging) conditions on brightness of the deinked pulp was investigated
using accelerated aging and natural aging methods. The different parameters of the deinking
process were studied in order to find the best way to treat the aged material and obtain the
target brightness with acceptable cost for energy and chemicals. Experimental design
parameters in the lab study included pulping time, pulping temperature, soaking temperature,
flotation temperature and surfactant dose.
It was observed that the old newspaper was aging differently under different storage
conditions. This study quantified the effect of storage condition, namely: outdoor-uncovered,
outdoor-covered in dry and rainy seasons, and at warehouse (indoor) storage on brightness of
the deinked pulp for different storage time. It was concluded that the storage temperature has
the most important effect on pulp brightness; indoor storage paiiially preserves the
deinkability of the old newspaper. To remedy for the brightness loss due to aging, the shorter
pulping time and higher surfactant dose were recommended.
Application
This paper discusses about decrease in deinkability of old newspaper during the storage time
prior to deinking and suggest some changes in deinking conditions in order to get the
acceptable product from thermal aged old newspaper.
|
| Year | 2001 |
| 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) | Retulainen, Elias R ;Ruhanen, Mauno
|
| Scholarship Donor(s) | The Government of Finland |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2001 |