Linting problem of newsprint due to filler content : a theoretical approach | |
| Author | Marin Malai |
| Call Number | AIT RSPR no.PP-10-02 |
| Subject(s) | Newsprint Offset printing |
| Note | A project submitted in partial fulfillment of the requirements for the degree of Professional Master of Science in Pulp and Paper Technology |
| Publisher | Asian Institute of Technology |
| Abstract | In newsprint offset printing, linting is one of more serious problems. The lint problem actions that the lost bound materials(fines, fibers and fillers)are removed by tacky ink at the printing nip. Then they can deposit on the blanket cylinder or they can travel back into the plate, ink and fountain solution system. All of them can affect print quality and sometimes the process has to be stopped and cleaned. It shows that the print quality is not only one effect from linting, but also the press product reduction. This special project is carried out through reviewing and analysis of the information from various sources including both academic and industrial publications. The study covers effect of filler characteristics on linting, effects of linting in printing process, correlation between amounts of filler and the BIMTAL value and linting prevention in newsprint industry, Norske Skog. Norske Skog (Thailand)uses ONP and OMG to be their raw materials. Every newsprint products are produced by 80% ONP and 20% OMG of total pulp material but sources of raw material are varied. In Laboratory, every raw material is tested about ash content which is kept in raw material databases. It is used for determining total ash content produced by raw materials and calculating amounts of GCC added in the slurry but total ash content in product have to be still in acceptable range, 9-13% OD newsprint weight. However, number of ash content from calculation is not exact correct because of raw material and process variation Nowadays, the methods of linting reduction are used in papermaking industry and printing house showed in the table below. At papermaking industry 1. Using hydrocyclone and centricleanner (improve surface properties) 2. Reduce amount of filler in sheet (increase fiber to fiber bonding, hydrogen bonding) 3. Using more intensity of refining (reduce coarseness of fiber and more swelling) 4. Using the sharp knife to slit the paper (less dusts) 5. Using some chemical. At printing house 1. Reduce printing speed 2. Reduce the pressure at the nip 3. Increase temperature of ink (decreasing of tack and viscosity of ink) 4. Limit the age of blanket. |
| Year | 2010 |
| Type | Research Study Project Report (RSPR) |
| 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) | Joshi, Lalita;Pichit Somboon;Shashank, Bharti; |
| Scholarship Donor(s) | NORSKE SKOG (Thailand) Co. Ltd.; |
| Degree | Research Studies Project Report (M.Sc.) - Asian Institute of Technology, 2010 |