The single-screw extruder is simple in design, low in price, and therefore widely used.
(1) The material transportation of the single-screw extruder is mainly based on friction, so that the feeding performance is limited, and powder, paste material, glass fiber and inorganic filler are difficult to join.
(2) When the head pressure is high, the countercurrent increases, which reduces the productivity.
(3) The material of the single-screw exhaust extruder has little effect on surface renewal in the exhaust zone, so the exhaust effect is poor.
(4) Single-screw extruders are not suitable for certain processes, such as polymer coloring, thermosetting powder processing, etc.