For the preparation of HPMC/nanoclay composite film mixtures, nanoclay at 5% (w/w) of HPMC was used, as this nanoclay content is commonly used for the preparation of nanocomposite with biopolymers (Rhim et al., 2006). At first, precisely weighed nanoclay was dispersed with distilled water and stirred overnight using a magnetic stirrer to reach complete hydration/ swelling