The aim of this study was to develop enteric coated
diclofenac sodium 50 mg/ tablet by using Sureteric
without a sub-coating step. Enteric coating was
successfully done using Sureteric white coating aqueous
dispersion. The preparation of this aqueous dispersion is
easy and requires short time which decreases the cost of
the coating process. Sieving was done to separate non
dispersed particles of polymer that may result in gun
needle obstruction or alteration of the smoothness of the
enteric coat. The dispersion was stirred during the
experiment to avoid sedimentation and coalescence of
particles. Tablet coating was carried out in conventional
coating pan using spray coating technique. During
coating, certain parameters require great care such as
temperature of coating pan and the spray rate of coating
dispersion. If these are not maintained properly, they
affect the smoothness and uniformity of coating. In fact,
some process parameters of potential importance,
including the temperature of coating pan and the spray
rate of the coating solution were investigated by other
researchers (Sauer et al, 2007; Parikh et al., 1993;