Viscoelastic Characteristics of Disperse System of Tobacco Powder and Water II.

Effects of Porosity and Additives on Elastic Characteristics under Oscillatory Stress

Abstract

To clarify elastic characteristics of disperse systems of tobacco powder and water, the complex dynamic shear modulus γ^* and the complex dynamic tensile modulus E^* are measured by the forced vibration method, and the effects of porosity and additives on these moduli are examined. The following results have been obtained; the values of |E^*| are about 4 times of these of |γ^*| for the samples having the same stress history, and the effects of sample shape on these moduli are negligible. The effects of porosity on |E^*| is not explained by the effective area of tobacco powder and water in the cut section of sample. To increase E*, carboxymethyl cellulose (CMC) as a binder, pulp as a reinforcement material are used. |E^*| is not affected by the addition of CMC at concentration of 0.9~4%, but is affected remarkably by the addition of pulp. |E^*| increases with increase in pulp content. Filling value is highly correlated with |E^*|, and increases with E^* of the system. It is clarified that the addition of pulp is effective to improve the filling value of the reconstituted tobacco.