ويژگي هاي كاغذ بهداشتي از خمير جوهرزدايي شده كاغذ روزنامه كهنه و كاغذ باطله اداري

Properties of tissue paper from deinked old newspaper and mixed office waste

Increasing the world population and the shortage of wood supply as raw material for paper production necessitates the recovery of waste paper. Among of the different waste papers, both old newspaper and mixed office waste are considered as important groups of recycle papers which have been successfully utilized in tissue production. In such applications, pulp brightness is of prime importance. Old newspaper was deinked using 2% NaOH and 2% H2O2 and mixed office waste was deiced using 1 % NaOH and 2% of H2O2 which produced the highest brightness. Two pulps were combined at different ratios of 20, 30, and 40% deinked old newsprint and60, 70, and 80% deinked waste office waste. Hand sheets were made using 20% long fiber and 80% mixture of above pulps. Strength and optical properties of hand sheets were measured and analyzed. The combination of 20% old newspaper and 80% mixed office waste produced the highest brightness and increasing the ratio of old newspaper in the mixture reduced the brightness. Increasing the ratio of old newspaper in the mixture reduced the tear strength and increased the water absorption. The ash content of the handsheets was lower than one percent which is lower than acceptable level for tissue paper. Significant difference was not observed for any of combinations of two different pulps.