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  High fines(dust( generation) with pellets

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Author Topic:   High fines(dust( generation) with pellets
Amit Kumar
Member

Posts: 2
From:Maharashtra, India
Registered: Dec 2004

posted December 28, 2004 10:47 PM     Click Here to See the Profile for Amit Kumar   Click Here to Email Amit Kumar     Edit/Delete Message   Reply w/Quote
Polypropylene twin screw extruder is generating a lot of fines alongwith product pellets. However, pellet quality is good.After cutting of pellets by cutter rotor (12 blades), pellets are conveyed by water to dryer where water is separated and recycled back for the same process. The filters in recycle line are chocking very frequently due to high fines(dust) genetaion.
Can any body please give some clue for the reasons of fines generation?

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Tom C
Moderator

Posts: 595
From:Brodheadsville, PA USA
Registered: Jun 2001

posted December 30, 2004 10:05 AM     Click Here to See the Profile for Tom C   Click Here to Email Tom C     Edit/Delete Message   Reply w/Quote
I think Berstorff published a paper on this subject in the past. It had to do with cutter velocity and pellet formation problems at high cutter speed. I'll see if I can find it.

Tom C
www.ExtrusionTech.com

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Woo Meng Wai
Member

Posts: 1
From:Petaling Jaya, Selangor, Malaysia
Registered: Sep 2005

posted September 19, 2005 12:31 AM     Click Here to See the Profile for Woo Meng Wai   Click Here to Email Woo Meng Wai     Edit/Delete Message   Reply w/Quote
Hi,

If the fine dust does not affect the quality of your product and only affects the recycled water, I would suggest to replace the filter with a unit which automatically backwashes. This will reduce the choking of the water flow as low water flow into the cutter might cause it to choke with pellets as well.

Tom, it would be nice if you could obtain the paper. I am very interested in the paper too. Thanks

[This message has been edited by Woo Meng Wai (edited September 19, 2005).]

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Tom C
Moderator

Posts: 595
From:Brodheadsville, PA USA
Registered: Jun 2001

posted September 19, 2005 10:25 PM     Click Here to See the Profile for Tom C   Click Here to Email Tom C     Edit/Delete Message   Reply w/Quote
Still looking for the paper.

An inquiry into Berstorff has not been answered yet.

------------------
Best Regards,

Tom Cunningham

Extrusion Technical Services

www.ExtrusionTechnicalServices.com

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