B) Common Fault Analysis and Trouble Shooting for Wet Extruders

Trouble	Cause	Solution
The powder is too rough.	Die hole die is too large, or too larger the aperture ratio.	Reduce the diameter of the die hole, reduce aperture ratio.
The powder cannot be discharged.	The feeding amount is too large while the water pressure and water flow is too small.	Adjust feeding flow and make sure of the water pressure
The feed is pasted.	There is too much water.	Adjust the flow
The pellet is too large; the temperature of the extruded powder is too low.	The screw sleeve, screw rod or die head are badly worn out.	Replace screw rod, screw sleeve or die head
No feed being discharged during normal operation.	The discharge hole is blocked by impurities.	Remove the impurities inside the die hole
The feed has unequal sizes.	The die hole has unequal sizes.	Equip die hole of proper size
The extruded pellet has unequal lengths.	The cutting speed is too high or too low.	Adjust the speed of the cutter
Material splashing out of the inlet during feeding	Too fast feeding in material or not smooth feeding or blockage happened.	Control the feeding speed.
The fracture of the powder is uneven.	The blade has hole or the gap between the blade and die plate is too big.	Replace the cutter, adjust the gap