Abstract
Numbers of spinning tests were made on the viscoses prepared from various types of dissolving pulps varying in sulphite or prehydrolysis sulphate, soft wood or hard wood, and high or low in viscosity and alpha-cellulose content.
The results were evaluated with regard to the effects attributable to the characteristics of the pulp.So far as the comparisons were made within the analogous, types of pulp, it was recognized that the important strength properties such as the wet-dry ratio in tensile strength and the bending endurance are difficult to be developed to higher level with increased amount of low DP cellulose fractions expressed as beta-or gamma-cellulose in aged alkali cellulose.
The measurements of the spinnability of viscose solution which should be an index of the rheological characteristics of it, have shown that the spinnability will be of great importance to obtain the rayon fibers of satisfactorily high levels in the qualities.
Many other aspects concerned with the pulp characteristics, including the analytical results, the sulphidation resistance, the filterability of viscose and the colloid chemical changes during ripening of viscose were also investigated and discussed in connection with the strength properties of the rayon.
