Date of Award


Degree Name

Bachelor of Science


Pulp and Paper Technology


The purpose of this thesis was to study the effect of board structure on the stiffness of cylinder board. This area was chosen as stiffness is one of the most important attributes of cylinder board and the literature survey revealed that very little work has been done in this area.

A new method for making multi-ply boards in the laboratory was developed. These boards were made in the British Sheet Machine under constant head and avoided the problems associated with wet-pressing individual plies together. This method was found to give reproduceable results.

At certain compositions, multi-ply boards made with kraft liners and groundwood filler had stiffness values that were greater than kraft or groundwood alone at the same caliper.

Stiffness values were converted to bending modulus as it was felt that this would remove the effect of caliper. However, it was found that it does not accomplish this.