Effect of ONP Type on Deinkability

This project was undertaken to study the deinkability of Iranian old newsprint and to compare it with
Thai and American ONPs. The raw material samples were collected from the store houses (central
office of newspapers) in Tehran as well as from a local mill in Bangkok. The experiments were
conducted under similar conditions for j different raw material samples, Iranian ONP, Thai ONP,
American east coast as well as west coast ONP. After sample preparation, wash deinking technique
was conducted by means of Bauer McNett fractionator. Finally, handsheets were made using
laboratory standard sheet maker to examine the optical properties of deinked handsheets. Deinkability
was determined using two methods, Deinkability-brightness and Deinkability-Lab methods.
The results indicated that Iranian ONP exhibited the highest deinkability-brightness factor while
had the highest deinkability-Lab factor was recorded for American ONPs.