investigation effect of using branch woods of hornbeam and beech in compound of hardwoods stems wood mixture on cmp pulp properties

in this research, effect of using hornbeam and beech branch woods in admixture with birch stem wood on their cmp pulp properties. using percentage of branch woods, with 20% constant content for birch stem wood, were 0, 16, 40, 56 and 80 in final mixture of hardwoods. the results indicated that cooking time, to reach 85% yield and under same cooking condition, and also refining quantity, to reach 300 ml constant csf freeness, were decreased with increasing portion branch woods (p<0.01). moreover, despite a little decrease (p<0.01) in the optical and mechanical properties of the produced hard sheets by addition of branch wood in the hardwood stems wood, using 40% of branch wood in final mixture of the initial materials for making cmp pulp is recommended.