Investigating on CMP and Newsprint from Canola Straw

Enough wood supplying for pulp and paper industry of our country has been encountered with serious difficulties caused by destruction of forest and wood shortage and fiber resources. Thanks to the developments in the widespread plantation of canola in Iran, in this research, we have studied the specific features of CMP pulp prepared from Rapeseed Straw. For this purpose, Rapeseed Straw CMP pulp was prepared at 160°C temperature, 40 minute time, 5 and 10 percent chemicals charge and 7:1 cooking liquor and canola stem ratio. In order to brighten the resulted pulp, hydrogen peroxide (5.5%) was applied. The yield of pulp obtained in 5% and 10% cooking chemicals conditions, were 78.07% and 74.07% respectively. In this content, the Strength Properties of the hand sheets prepared were measured as followings: tensile strength, 19.33 and 20.033 Nm/g; Burst strength, 0.83 and 0.57 Kpa.m2/g; tear strength, 2.57 and 3.25 mN.m2/g and Opacity 95.02% and 96.32%. This study has shown that, considering limitations in wood resources, the Rapeseed Straw, could be successfully substituted impart, in pulp and paper industry of our country, as a cheap and available lignocelluloses material for producing CMP pulp and papers.