Some points regarding the malfunction and troubleshooting of extruder
Study the following table to see the malfunction and troubleshooting of extruder.
| Trouble | Cause/s | Solution/s |
| The temperature of the expansion chamber does not reach the rated temperature. | The steam line is blocked.
The expansion chamber’s inlet steam is blocked. |
Clean the steam line.
Clean the expansion chamber’s inlet steam. |
| The temperature of conditioning does not reach the required temperature. | Insufficient steam temperature; Blocked steam line | Check and then adjust the steam pressure at 4 bars;Clean the steam line; |
| The extruder delivers coarse surface materials in different lengths after expansion
.
|
Conditioning process is done poorly.
Some die holes are blocked. Particle size is not sufficient. The quality of the die plate is not good. |
Start to condition the material, then stop the machine and clean the die plate.
Increase particle size. Use high-quality die plates. |
| The throughput has reduced.
|
The worn shearing block;
The sever worn screw’s head;
|
Use a new shearing block.
Use a new screw head. The corroded cylinders should be replaced. |
| Materials are not discharged following the normal operation.
|
Feeding duration is excessively short/ feeding is cut off.
Blocked die holes; |
Turn off the machine to check it.
|
| Wave-like discharge occurs | The expansion chamber is insufficiently full. | Throughput should be increased. |
| Expansion occurs excessively.
|
The temperature is excessively high.
The rotation speed of the main machine is excessively high. The throughput and the area of the die plate holes do not match. |
Decrease the temperature.
Lower the rotating speed. Readjust throughput or change the area of die plate holes (it should be greater).
|
| The expanded pellet is excessively long or short. | The cutting speed is excessively high or low. | Set the cutting drive rotating speed. |
| Product is formed poorly; the product is in the small or large size; producing dust during production | The raw materials are of improper formula.
The processing temperature is excessively high. Feeding is not stable; The moisture content of the product is very high or low. Cutting speed is improper. Sever worn blade; Grinding particle size is very large. |
Change the raw materials formula.
Set an even feeding. Increase or decrease the moisture content or steam volume. Set the machine on an appropriate rotating speed. Further grind the raw materials until the smaller particle size is reached. |
| Product is formed poorly;
There is the problem of the small or large size of the product. |
Steam fluctuations;
Water fluctuations; Power fluctuations; |
The boiler pressure should not be less than 8 bars.
The fog spraying path and steam pipes should be checked. The water pump should be checked to be healthy. The tank should be before the pump. The spraying path should be controlled to avoid the trash blockage. Using a voltage stabilizer to make the power fluctuations stable. |
* Every day all parts of the extruder should be investigated, controlled, and greased.
* Warning: All machinery should be repaired, modified, and regulated after the main power board is turned off.
