The effect of different recovered fibres on mechanical properties of board

University essay from Karlstads universitet/Avdelningen för kemiteknik


The objective of this work was to determine the influence of recovered fibres on the mechanical properties of board. Industrial board was provided by Fiskeby Board AB and laboratory board was made by using an isotropic sheet former. Board properties such as tensile strength, tensile stiffness, z-strength and bending stiffness were evaluated. Variation in the grammages of the middle and bottom layers of laboratory board was done and influence on the mechanical properties was studied. Each layer of multiply board was also tested separately at industrial board grammage and standard grammage.

Results showed an increase in the tensile properties with the increase in the grammage of bottom layer, an increase in the z-strength of the board was also observed. Bending stiffness calculated by laminate theory also indicated an increase with the increase in the grammage of bottom layer. While testing of the separate layers showed an increase in the tensile properties of the layers with increasing the grammage while a decrease in z-strength was observed.

Cracks occurred in the bottom layer of the multiply boards but an increase in the mechanical properties of board was observed.

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