What are the reasons for a sudden drop in current in the main motor of a polyolefin extruder?
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A JSW extrusion granulator of model CMP308 was not equipped with a melting pump; the product grade remained 360 and the melting index stayed unchanged. After replacing the catalyst, the current of the main motor dropped suddenly, from 200 to around 100, causing the machine to stop due to the low-current protection. This situation persisted for several days. Do any of you have an idea as to what might be causing this problem?
Possible reasons include: 1. The replaced catalyst may cause changes in the speed or efficiency of the polymerization reaction, affecting the loading on the extruder. 2. After the catalyst is replaced, the melt flowability of the polymer may change, resulting in a reduced power requirement for the main motor to drive the extruder. 3. There may be a blockage or partial blockage inside the extruder, resulting in poor material transfer. It is recommended to check whether there are any blockages or increased friction in the material conveying system. Additionally, it is advisable to conduct a detailed physical property analysis of the products before and after catalyst replacement in order to identify any differences. If necessary, try adjusting the extrusion process parameters or switch back to the original catalyst for testing and comparison. .
I think there’s a problem with the feeding system; it’s recommended to check it
The feeding system was inspected earlier; the production capacity and feed rates remain largely unchanged. The suspected cause has shifted to the catalyst; it is currently under testing
How’s the debugging going, boss? Is there a result?
After replacing the catalyst, clumped material may form; during the discharge process, these clumps interfere with the operation of the rotating discharge valve, resulting in uneven discharge at the hopper inlet and causing a decrease in current to the main motor, which leads to shutdown. Circulation can be enabled in the silo during production, and the lumps can be removed during this circulation process.