2.2. Preparation of sheets
Initially, pellets of thermoplastic starch were
produced by extrusion in concentrations of 0.25 g and
0.30 g of glycerol per 1 g of starch (TPS25 and TPS30,
respectively). The pellets of TPS and PLAwere then mixed
at a ratio of 70/30 (wt/wt) and extruded to obtain blends
of TPS25/PLA and TPS30/PLA. Both the TPS and the blends
were processed in a single-screw extruder (BGM, model
EL-25,Brazil) with 25 mm screw diameterand L/D ratio of
30.Thescrewspeedwas35rpmandthetemperaturesin
the four heating zones were 120C and150 C for
theTPSand blend processing, respectively.
For the sheet production, blend pellets were thermo-
pressed in a hydraulic press (Schulz, model PHS, Brazil) at
150C and 2.6 MPa and then cooled to room temperature.
2.2. Preparation of sheetsInitially, pellets of thermoplastic starch wereproduced by extrusion in concentrations of 0.25 g and0.30 g of glycerol per 1 g of starch (TPS25 and TPS30,respectively). The pellets of TPS and PLAwere then mixedat a ratio of 70/30 (wt/wt) and extruded to obtain blendsof TPS25/PLA and TPS30/PLA. Both the TPS and the blendswere processed in a single-screw extruder (BGM, modelEL-25,Brazil) with 25 mm screw diameterand L/D ratio of30.Thescrewspeedwas35rpmandthetemperaturesinthe four heating zones were 120C and150 C for theTPSand blend processing, respectively.For the sheet production, blend pellets were thermo-pressed in a hydraulic press (Schulz, model PHS, Brazil) at150C and 2.6 MPa and then cooled to room temperature.
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