Bioresins in blown films

Although bioresins can be extruded using conventional polyethylene lines, Bandera, based in Busto Arsizio (Varese, Italy), has developed and optimized, in cooperation with Novamont, some appropriate modifications to its blown film lines. The screw design has been modified to prevent melt overheating and permit better temperature control along the whole barrel. The extrusion head has also been redesigned with separate inner channels differentiated according to the rheological characteristics of the biopolymers used.