posted January 18, 2003 08:01 PM               

Extrusion - "Intrusion Molding" appears to be a nich technology that I've heard of only once before, but it again surfaces.

Does anyone know if this is a single or twin screw process, or where I can learn more about this? Propritary and/or license applicable?

posted January 19, 2003 02:22 AM               

What magazine did the article appear in?
this link has a little on intrusion molding http://www.p2pays.org/ref/04/03938.htm

posted January 19, 2003 10:12 AM               

I know of two processes making rail road ties. The trials have gone well, and I think they will be making ties by the millions soon. They are a little more expensive than wood ties, but seem to last a lot longer.

One process uses a W&P twin screw directly extruding into the mold. The other uses a Banbury mixer which discharges to a single screw to fill the mold. In my opinion the Banbury process is much more capable of handling the variations of feedstock that are used in this process. ALso the Banbury charge can be sized to the exact weight that they want in the mold.

I can put you in touch with a person who is deeply involved if you like.

Tom C