SAFETY BOARD FROM WASTE PAPERS

Waste papers such as preused writing and printing paper, and newsprint can be recycled in the form of board without deinking. The resulting board is not safety-grade because of the contents of the ink. Therefor e deinking of waste papers is essential before making board. In this w ork deinking of these types of paper was affected by the use of certai n percentages of local detergents followed by washing. The analysis of deinked papers showed a significant decrease of lead to reach less th an 0.9 ppm, which is safe for use as boards in packaging [1]. The stre ngth properties of the deinked board showed high values compared with those prepared without treatments. Addition of starch and sodium silic ate to the deinked waste papers increased the mechanical properties of the board.