posted November 09, 2002 08:59 AM               

quote:

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Originally posted by plumbobr2:
My company is attempting to process polypropelene micro pellets in a Gala underwater pelletising system. We are using a .020 die. So far we have been unable to make it work.We either end up with agglomeration, or we end up wraping the pelletizer blades. I would appreciate any suggestions or remedies. Please let me know if it has/can be done!!!

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posted November 15, 2002 07:33 AM               

quote:

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Originally posted by plumbobr2:
My company is attempting to process polypropelene micro pellets in a Gala underwater pelletising system. We are using a .020 die. So far we have been unable to make it work.We either end up with agglomeration, or we end up wraping the pelletizer blades. I would appreciate any suggestions or remedies. Please let me know if it has/can be done!!!

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G'day

Is it an auto start up?
Timing is very important, if water enters into the water-box too soon freeze-off could occur causing variation in pellet size.
If water enters too late the cutter will agglomerate with the molten polymer.
Some other possible causes:
- polymer too hot
- improper melt temperature of the material
- water too hot
- process water flow too low
- blades worn out
- miss allignment
- broken blades
- cutter hub holder not moving freely
- cutter hub installed backwards?
Hope this can be of any help. Good luck.

posted November 25, 2002 04:33 PM               

I'm sure you currently do this, but it is important to ensure that your pelletizer is aligned properly to the die. Make sure you burn your blades in prior to beginning the run.

When you start up, are the amps to the pelletizer off the charts? Or is this something that happens 5 minutes into production.

As stated earlier, if you're using the incorrect # blade prop, you will incur problems. In past experiences with PP, I had to drop from a six blade prop to a 3 blade prop to solve my problems with agglomeration.