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| Author | Topic: looking for a better mix. |
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mademan5284 Senior Member Posts: 38 |
posted September 17, 2007 10:39 AM
  
Has anyone ever tried using a double barrier screw for filled fluoropolymers? Also can such a screw be used in a compounding extruder, for pelletizing? ------------------ IP: Logged |
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Tom C Moderator Posts: 892 |
posted September 18, 2007 04:48 AM
Do you mean an SPR double flighted double barrier screw, or a screw with 2 barrier sections in a row? Either way, whether it will work depends on the task. ------------------ Tom Cunningham www.ExtrusionTechnicalServices.com IP: Logged |
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mademan5284 Senior Member Posts: 38 |
posted September 18, 2007 02:16 PM
I saw an old post about the Spr. I am looking for high efficiency at high speed. Fully homogenous and mixed well so no radiopaque agglomerates are present during a .005 - .015 wall extrusion. I am not sure how fast I can go and still hold +/- .001. ------------------ IP: Logged |
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Tom C Moderator Posts: 892 |
posted September 18, 2007 10:19 PM
You don't want much!  Pressurization for exrusion causes agglomerates so it is hard to compound and profile extrude at the same time. However it is done successfully in both simple and complex systems depending on what tricks you employ. Initially I would suggest optimizing seperate compounding and extrusion steps, then explore methods of combining the processes. I work with Randcastle extrusion, and they have developed some great mixing technology that might be able to give you what you want in one step. ------------------ Tom Cunningham www.ExtrusionTechnicalServices.com IP: Logged |
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Stephen J. Derezinski Senior Member Posts: 81 |
posted September 23, 2007 05:55 PM
Consider the "tandem extruder" ( U.S. Patents 5,500,172 and 5,358,327) to provide mixing independently of flow rate. The tandem has a single barrel with "screws or rotors" driven by two motors on either end of the barrel. So, the flow rate is set by the speed of the first motor and the mixing would be controlled by the speed of a second motor (with a mixer suitably attached to the second screw.) The degree of mixing could then be easily adjusted independently of the desired flow rate. IP: Logged |
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