Originally Posted by Parkz58

Greetings,

Has anyone encountered the production of plastic "fines" when pneumatically conveying plastic beads through a system that utilizes 90 degree Hammertec elbows?

Please let me know what you've encountered.

Thanks,

Parkz58

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Dear Sir,

Generation of fines depends upon the melt index, density, and viscosity of the pelleted material being conveyed. Fines are generated due to the high velocity wall friction of the pellets with the internal surface of the pipe as well as with the bends. Long radius bends contribute more to fines generation than small radius bends because of longer surface area. Hammertek bends are essentially 90 degree bends with a specially shaped pocket due to which their internal surface area is much less. This leads me to believe that most of the fines that are generated in a conveying line that has Hammertek bends would be from the straight pipeline than from the Hammertek bends.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting ■