Fault | Reasons | Process |
|---|---|---|
| The feeding screw bush is surrounded with hardened material. | 1.The water pipe for cooling feeding zone of barrel is plugged up. 2.The water pipe for cooling s crew shaft is plugged or broken away from the shaft. | 1.Repair and clean the pipe connected to the feeding zone of barrel. 2.Pull out the pipe from screw shaft, clean it with compre ss ed air. |
| The material is melted and hardened at the outlet of feeder funnel. | 1.The s et temperature is too high. 2.The ambient temperature is too high. 3.The temperature of cooling water is too high. 4.The flow rate of cooling water is too small. 5.The grain size of raw material is too fine. | 1.Lower the settemperature. 2.The temperature of cooling water should be W14 °C. 3.Increase flow rate of cooling water. 4.The grain size of raw material should be〉3mm. |
| The capacity of extruder is reduced. | 1.The grain size of raw material is too fine. 2.The feeding bush of s crew shaft is surrounded with hardened material. 3.The barrel and s crew shafts are not to be cleaned for a long time. | 1.The grain size of raw material should be〉3mm. 2.Adj us t the speed of screw shaft at a fas ter value. 3.Stop extruder and clean barrel and s crew shafts. |
| The quality of extruded powder coating is inferior. | 1.Extruder is not cleaned for a long time. 2.The conjunction surface of two half barrel is not cleaned, the air-tight of which is low grade. 3.The liner and s crew bushes are worn and torn. | 1.Clean the extruder carefully. 2.Clean barrel and its conjunction surfaces. 3.Replace the worn liner and bushes. |