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MAPP Plastics Discussion Forum

The MAPP Plastic Industry Discussion Forum allows members to rapidly communicate with each other. Post both questions and answers to questions that other MAPP members have about any industry topic from material and process issues to R&E Tax Credits and other business issues.

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Posted:  04 Aug 2015 20:18
We are running Rapid 400 series granulators with cyclone evacuation beside our presses for our extrusion blow molding facility.  The dust created by them is difficult to contain, nothing we have tried has worked very well thus far.  I'm wondering if any other companies have experienced this problem and what measures were taken to remedy the situation.  Your feedback is greatly appreciated, thank you.       

David Norsen
Posted:  06 Aug 2015 19:25
On one of our larger systems, we installed a VFD on the cyclone blower motor to reduce speed and force of air. Installed a plastic square material bin (example- the cyclone and plumbed the cyclone outlet to the lid of the bin. Cut another hole in the bin lid and installed a filter so air could evacuate dust free. Installed a tighter mesh cyclone filter sock. Are blades sharp?

Nick Bandura
Posted:  07 Aug 2015 00:41
The first thing that our grinder supplier suggested we do is check that the blades are sharp and that the gap between the blade and the screen is correct.  We did this and immediately saw a reduction in dust (although I'll admit that it's not completely eliminated yet).
Posted:  07 Aug 2015 16:03
Thank you for the responses on this issue.  We too are using a square bin with an aluminum lid that has 2 holes.  We connected the cyclone to one of the holes and installed a filter sock on the other to vent off any pressure.  The dust still finds a way out of our containment. 

The blades are sharp, we check in between set ups and regap the blades once a month during a regular PM (.080-.010").  We tried switching to screen with 10mm holes instead of the 8mm that we were using and although it is a little better, we are not where we would like to be just yet.
Posted:  13 Aug 2015 17:32
Some of our customers are using screeners from Sweco with good luck. I personally have also used them. You sift out the fines / dust. ...

Harold Colwell
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