Table 1.

Temperature profile of extruder barrel sections for the cases of a material temperature of 124 °C and 135 °C.

Setting No.	1	2
Material temperature/°C	124	135
Temperature barrel 2/°C	40	40
Temperature barrel 3/°C	60	60
Temperature barrel 4/°C	80	90
Temperature barrel 5/°C	110	130
Temperature barrel 6/°C	123	135
Temperature barrel 7/°C	124	140

The samples were taken after the extruder responses had been stationary for at least three minutes. To analyze the product structure, the samples were photographed immediately after removal from the process. To analyze the microstructure, the extrudates were frozen immediately after the extrusion process and stored under vacuum at −18 °C until further examination.