An extruder THERMO HAAKE Minilab Rheomix CTW5 model
with double screw (109.5mm) was used for the preparation of
mixtures. Process conditions were 200 ◦C, at rate 75 min−1 and
recirculation time was 10 min, optimum conditions previously
determined for successful mixing of the materials. The composites
are made with PLA as matrix with different concentrations of
Kraft lignin and acetylated Kraft lignin (0.5, 1, 5, 10, and 20%).