The films were produced by blow extrusion using a single-screw
extruder (BGM, model EL-25, Brazil) with a screw diameter (D) of
25 mm and a length of 28D and a film-blowing die of 50 mm. The
process conditions consisted of a screw speed of 35 rpm and a
temperature extrusion profile of 100, 120, 120, 130 and 130 C. The
formulations of the biodegradable films are shown in Table 1.