Studies on Ageing Velocity of Beech Alkali Cellulose

Abstract

The ageing velocity of beech alkali cellulose was investigated as a measure of the viscosity of viscose.
The results are as follows :
(1) The viscosity of viscose from beech pulp is lower than those from red pine and spruce pulp, but except first several hours, there is no difference between the ageing velocity of beech and other wood species.
(2) The influences of ferric ion in the steeping lye on the degradation of alkali cellulose are not admi ttable between beech and other wood species and its effects appear only at the beginning of ageing.
(3) The logarithms of viscose viscosity is a linear function of the D.P. Therefore, the aged alkali cellulose from beech which is lower viscose viscosity has lower D. P. than those from other wood species. (Moreover, in viscosity measurement by falling ball method, the structural viscosity is not necessary to be considered.)