Most studies have reported the influence of chitosan and glycerol
only on the properties of films produced by the casting method,
but there are a few papers that have studied the effect of chitosan
films produced by blown extrusion. Pelissari et al. (2011) investigated
the effect of extrusion process variables (die temperature and screw speed) on the properties of films composed of chitosan
and starch blends and concluded that an increase in the screw
speed resulted in an increase in the blow-up ratio and WVP values
and a decrease in the opacity, tensile strength and elongation at
break of films. Low die temperatures resulted in an increase in tensile
strength, elongation at break, Young’s modulus and WVP. Thus,
extrusion is a viable alternative due to high productivity and both
minimal space requirements and process steps compared to the
method of casting. Furthermore, many traditional commercial films
are produced using this process
Most studies have reported the influence of chitosan and glycerolonly on the properties of films produced by the casting method,but there are a few papers that have studied the effect of chitosanfilms produced by blown extrusion. Pelissari et al. (2011) investigatedthe effect of extrusion process variables (die temperature and screw speed) on the properties of films composed of chitosanand starch blends and concluded that an increase in the screwspeed resulted in an increase in the blow-up ratio and WVP valuesand a decrease in the opacity, tensile strength and elongation atbreak of films. Low die temperatures resulted in an increase in tensilestrength, elongation at break, Young’s modulus and WVP. Thus,extrusion is a viable alternative due to high productivity and bothminimal space requirements and process steps compared to themethod of casting. Furthermore, many traditional commercial filmsare produced using this process
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