Screw extruder backflow
By rammstein737
Published: September 7th, 2010
Published: September 7th, 2010
Hi all,
I am planning to manufacture a screw extruder with a 50 micron nozzle connected to the outlet bore. The material to be extruded is polycaprolactone(pcl). The screw length is roughly 15 cm. How to make sure that this won't have backflow when pressure is exerted, since the nozzle diameter is too small? Is there any software that can help me to find any backflow problems, can ansys polyflow be used?
Also, do you think instead of the normal design of the screw, a tapered screw or step screw would be better suited to prevent backflow?
Thanks!
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Dear sir, For more
Dear sir,
For more information about mould projects pls log in www.imould.com, it will help you find more about mould that will save a lot time for you.
sally
www.imould.com
Are you trying to say that
Are you trying to say that you will make an injection unit?
If you cannot tolerate ANY backflow, then you don't a Non Return Valve (NRV)
Use a "Sodick" type system with screw plunger.
If you are truly making an extruder then why a "nozzle"?
Be careful of thermal degradation of the PCL.
Keep on molding or extruding!
brent
www.matrixtooling.com