posted 06-27-2001 05:20 AM               

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I want to compound Nylon66 and add Glass fibre(33%) as well as a powder(25%). At the moment the strands that exits the die are very brittle and breaks off. What screwtype/design is required.How should the additives be fed into the extruder?What about venting?

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posted 06-27-2001 08:53 AM               

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What kind of extruder?

What is the powder?

Are you feeding everything into the throat at once, or are you down stream adding materials?

Tom C @ CCS

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posted 06-28-2001 01:51 AM               

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Hi,Tom.
Sorry for not being clear about the process.

I'm using a twinscrew with Nylon screws.

The powder is a flame retardant.The glass fibre is fed in downstream through a side-arm feeder.I've tried to feed the FR through the side-arm feeder as well.
I also tried to mix the FR with the polymer and feeding it into the throat.(GF always added downstream through side-arm)
I hope this is more clearer.
Regards.

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posted 06-29-2001 08:56 AM               

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I would suspect the flame retardent as the problem. Most don't do well in Nylon. Many FR materials break down at Nylon's processing temperatures, and I believe I've heard something about Nylons acidic nature causing a problem. I see that there are FR grades of Nylon listed, so check with your supplier for compatible materials. If you don't think this is the source of the problem, then I would try and extrude the Nylon alone, then Nylon+Glass, the Nylon+FR and see if anything comes out well. Let us know the results.

Tom C @ CCS

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