Abstract :
In the production of normally paper pulp, primary fibers are used. This fibres are consist of both long fibres and short fibres. In recycled paper production however, both primary fibres (short and long fibres) and secondary fibres are used. Secondary fibres divide into pre-consumer and post-consumer fibres. However these fibers are not as formal as primary fibers because of the re-processing. In this study, the differences in the dot area in offset printing applied to 1st.Pulp and various recycled papers that have differing fibre structures have been identified. With this intention, 133 lpi and 175 lpi output resolutions are widely used for 1st.Pulp and dot gains of 20%, 50% and 70% in test materials have been obtained. With the aim of examining the effect of dot area in printing on recycled papers, enlarged images taken from the scanning electron microscope (SEM) were used. As a result, how does the dot area effect of the differences between the fibre structure and surface roughness of recycled papers, are determined in this study.
NaturalLanguageKeyword :
Recycled paper , surface roughness , dot area , deinking , bleaching
