engleski

Strength properties of newsprint from recovered paper in admixture with wheat pulp

For papermakers throughout the world recovered paper that is repulped and made into new paper has become an important complement to virgin fibre. However, it should be noted that the maintenance of the fibre cycle relies on the feed of a certain amount of virgin fibres to ensure the strength and other properties of the paper to be produced. Therefore, along used papers and paperboards less expensive sources of virgin fibres such as non-wood fibres, especially agricultural waste, could be interesting alternative for pulp and paper industry. As newsprints are not high quality papers according to its optical, mechanical and chemical characteristics, in this research the possibility of using wheat semichemical pulp mixed with recycled pulp for making newsprint was studied at laboratory scale. For that purpose the tensile strength, tear resistance, bursting strength and surface strength (wax picking test) of laboratory made papers were determined according to TAPPI standards and compared to each other. Results indicated that addition of 10 to 30% wheat pulp to recycled pulp did not significantly changed the sheet strength of the laboratory newsprint compared with the control sheet (100% repulped recovered paper). Overall, the results showed that wheat straw as cheap, abundant and renewable agricultural residue of annual crops is valuable raw material which can be used as a lignocellulosic fibre for making newsprint in combination with recycled fibres.

wheat straw; semichemical pulp; newsprint; strength properties

Ovaj rad je u sklopu SuZ financijske potpore istraživanju:“Kemijska stabilnost otisaka na podlogama iz ne-drvnih vlakanaca”(voditeljica: dr. sc. Ivana Plazonić).