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| Author | Topic: Extruder design |
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shannon Member Posts: 1 |
posted November 04, 2002 03:54 PM
   
I am wondering about an extruder design that would heat and melt the material prior to the screw. I am interested in piping the material already melted into the screw chamber so that on-line measurements of viscosity can be taken through the pipe. Is there any present screw designs that would work in an application such as this? IP: Logged |
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Bob Cunningham Senior Member Posts: 115 |
posted November 18, 2002 11:37 AM
Most extruders are designed to melt solid material, so you won't find many designed to accept melted material. I have seen a unit (made by Dynisco, I think) that measures viscosity on-line right in your process. There are a few extruders that are designed to accept melted material like a foam secondary extruder, but then you have to re-extrude the material - seems like you're adding a lot of extra heat history just for the sake of measurement? -Bob Cunningham [This message has been edited by Bob Cunningham (edited 11-19-2002).] IP: Logged |
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zabielski Senior Member Posts: 386 |
posted November 19, 2002 06:14 AM
shannon: The use of a FCM (Farrel Continuous Mixer) first melts the product in two rotors that then drop the melt in a ribbon form into a single screw extruder. IP: Logged |
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Peter P Senior Member Posts: 61 |
posted November 19, 2002 10:00 AM
Shannon, It seems to me that you are desribing a hot feed extruder. I remember that Farrel used to supply one. Regards, PeterP IP: Logged |
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StrapGod Senior Member Posts: 23 |
posted December 27, 2002 10:02 PM
Dynisco does make an inline viscometer that will measure the melt flow or IV in several places in your extruder. They recently came in my plant and discussed it along with other things. You may want to give them a call. IP: Logged |
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