izvorni znanstveni rad
The differences in properties of laboratory handsheets are related to the properties of prints beeng recycled with respect to the type of substrate and printing technology. The type of fibers of the substrate, quantity of fillers, surface coating and type printing influence the mechanical and optical properties of recycled paper. In a controled and standardised process of laboratory recycling various substrates behave in a different way. As the newsprint paper is recycled paper itself, in its composition the fibers are short, hard, breakable, damaged emitting fiber fines. These fines together with the fiber and other additions create the sheet. The process of laboratory recycling includes the process of defibration whereby the fibers sweell and so do the fines, which in turn causes an increse in the consistancy of defibrated pulp compared to the pulp from primary fibers. The fibers of such substrates are longer, undamaged, hole. In the lack of fines the consistancy of such a pulp is lesser. The process of defibration and swelling of the fibers manifest differently for different papers, i.e. different prints, as seen by the values of mass, thickness, grammage, bulk and density of tested samples.
Recycled paper; Recycled fibres; Fines; Grammage; Bulk; Density
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