2.3. Antifungal packaging preparation
The active fi lm was prepared by extruding PCRPET with K S,
mixed in two different concentrations: 2.5 and 4.0 wt.%. The
extruder used for this purpose was Welex (USA) (Model 130 30D
5.0) operating around 255e 260
C. The extruded fi lm was then
thermo formed (John Brown Inc., USA) into clamshell packaging
with capacity to hold 175 g of berries. A few clamshells were also produced without K S addition, and these constituted the control
samples.