عنوان مقاله [English]
In this study the results showed that aspen has less fiber length than horn beam and beech, fiber diameter and cell pit is more and cell wall thickness is less. Furthermore, the diameter of the imported birch fibers is of the most amount in the comparison of two types of beech and horen beam. The chemical component of aspen and birch wood flour consists of the least Klason lignin and the most holocellulose. The handsheet properties of CMP pulp of birch and aspen showed that the bursting strength and breaking length which is more than beech and horn beam.