Longitudinal Grinding of Aspen

Abstract

The aim of this thesis work was to find out the paper properties obtained from longitudinal grinding of aspen. Mechanical Pulping, longitudinal grinding and short description of studied paper properties were introduced in the theoretical part.

The entire process included longitudinal grinding of aspen. There were five different points at which aspen were cut for longitudinal grinding. The points were at an angle of 00, 150,300,450 and 00 with reference of traditional grinding. For each point, pulp was prepared after longitudinal grinding and later extracted from pressure filtration. 10 test sheets from each point were made using recycled water and their properties were measured, analyzed and compared. Thickness, brightness and opacity, air permeability, bursting strength, tensile strength and tearing strength were measured. All the experiments were performed in the paper laboratory of Saimaa University of Applied Sciences.