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Possible root causes
Basically, cavitation results from the collapse of tiny gas bubbles, with the liberation of such an energy that it can attack metals. Most of the time, talking about underwater pelletizing, the conditions for cavitation occurrence are fulfilled when the water pressure is
too low in some region of the water bowl.
The pelletizing water pressure inside the water bowl can be by itself the main root cause for cavitation.
Additionally, excessive cutter RPM can cause this type of damage too.
AMN strongly advises that the water pressure inside the pelletizing bowl should be at least 1.5 bar; however, as previously exposed, an inadequate knife tip speed can provoke cavitation issues even if the water pressure is correct.
A solution may be putting more knives on your knife holder. Another option is using special knives that AMN designs and produces to allow operation at the damaging high RPM.
You can contact us to get more details on the subject and learn how to anticipate cavitation effect with a simple calculation.
Our experts can then advise on the best knife profile choice amongst our wide knife design offering.
With the high cost of a die plate, why not extend the die lifetime? Contact us today so we can help!