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  Plastic processing forums for extrusion information and advice and for other feed screw applications.
  Extrusion, Twin Screw
  Fluff Silica

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Author Topic:   Fluff Silica
Senior Member

Posts: 6
Registered: May 2005

posted May 27, 2005 12:53 PM     Click Here to See the Profile for guido1165     Edit/Delete Message   Reply w/Quote
I am starting a new project that consists of mixing fluff silica, wax, and CaCO3. I was told that pressurized feed boxes are made for the silica that attatches to the extruder barrel just before the head. Has anyone heard of this or does anyone know where I could find one of these feeders?

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Posts: 385
From:McHenry, IL USA
Registered: Nov 2002

posted July 11, 2005 11:08 AM     Click Here to See the Profile for zabielski   Click Here to Email zabielski     Edit/Delete Message   Reply w/Quote
I'venever heard of such pressurized box's to feed the light bulk density of silics.

However, I have used a process that pre-sprays silica wetted out with Isopropanol solvent - prior to mixing.

It allows the silica to "curl" up and in essence increase the bulk density. You can try this on a proto type basis to see if it will work for you. Additionally, I would sugggest that you use a Coupling Agent to assure that the silica will bind with the polymer matrix your using.

In general, silica is a very difficult filler to incorporate into any polymer matrix. I would additionally suggest that you try to do this a a master-batch.

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