Topic > Binder Viscosity - 1025

The viscosity of the binder has been changed by the change in temperature. The initial dispersion of the binder in the powder depends on the viscosity and the applied shear rate. (Schaefer, 1996) The viscosity of the binder also controls the rate of consolidation and therefore subsequent growth via coalescence. (Ennis et al., 1991). The results of Rough et al (2005) showed that as the temperature increases (lower viscosity), the regimes are reached faster because the binder is able to distribute itself more effectively in the mixture at a given shear rate which is in agreement with the work reported by Schaefer et al. al (1996). By increasing the amount of LAS paste, the mixing time required to form the designated regimes is decreased. Work carried out by Hibare (2012) showed that the peak modal diameter of granules remains similar in both reactive and non-reactive high viscosity binder systems, which is said to be a result of mixing time. Mort et al (2001) stated that the method of binder introduction/addition could influence the width of the size distribution of an agglomerate. A smaller binder droplet size may result in a narrower size distribution. According to Schongut et al (2013), grain size distributions have a weak dependence on the stirring speed (impeller speed) but a stronger dependence on the binder state. Schongut et al (2013) presented size distribution results at three different temperatures, where the highest temperature has the narrowest size distribution. The experimental research work carried out by Schongut et al (2013) was conducted in a stirred glass reactor with a bed of sodium carbonate powder and the binder (dodecyl-benzenesulfonic acid) injected into the bed. The powder bed was in stoichiometric excess, and each powder bed was used for two kinetic experiments before being discarded. By using the powder bed twice first... in the center of the paper... the pieces pack closer into the pulp. Due to the viscosity and therefore the reduced flow of the binder through the interparticle spaces, the consolidation process is slowed down, effectively delaying any excessive growth of the beads. This research aims to study the granulation mechanisms involved in a high viscosity detergent system in order to understand how a high viscosity binder is dispersed compared to a low viscosity one. This research would not work with low viscosity binders and would compare the research results to published work done on low viscosity binder granulation systems. More importantly, the research would focus on the effects of process parameters such as binder injection point (on which no literature was found) and granulation time, as well as impeller speed and binder quantities (with a considerably larger amount of published literature).