The conventional practice of sweet potato drying is performed under sun, which is a time consuming method (about 56 h), produces inferior quality product with high microbial contamination (Silayo et al., 2003). In order to reduce the time of drying and obtain quality final product,mechanical dryers are mostly employed which not only gives better quality product, but it avoids the dependency on the weather and reduces microbial contamination of the product.It also lowers the product mass and volume. The reduction in mass and volume improves the efficiency of packaging, storing
and transportation (Jayaraman and Gupta, 2006).
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