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| Author | Topic: Multi-lumen tubes |
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Plank Member Posts: 3 |
posted July 01, 2004 09:43 AM
  
We currently have mono and multi layer tube dies but are looking at making multi-lumen tubes (2/3/4 lumens etc) for research purposes. Can anyone give me more info on the best procedure for this? Is it just a matter of making a different pin and die for our current extrusion head? Do we need internal air control, guide wire, etc? Any info would be greatly appreciated. IP: Logged |
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louis33 Senior Member Posts: 85 |
posted July 01, 2004 11:47 AM
You should be able to make a die / mandrel (tip) to fit your current tooling but the outcome will depend on the material thast you plan on extruding and the type head that you now have. Typically, each lumen is connected to a separate accurate internal air source. How big/small of a multi-lumen are you considering making? There are prifiles and then there are profiles! [This message has been edited by louis33 (edited July 01, 2004).] IP: Logged |
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Plank Member Posts: 3 |
posted July 02, 2004 09:11 AM
Thanks for the reply Louis, we are thinking of making a 6mm O.D. tube with perhaps 4 lumens of 1.5mm in the first instance. (will try different configurations once we gain a bit of experience). Materials - EVA, PVC, TPU, TPE etc. Will cutting the tube at the end of the line affect the sizing if we are using air pressure in the lumens? Who supplies this type of equipment? IP: Logged |
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chris baldwin Member Posts: 1 |
posted July 06, 2004 12:49 PM
A source for lumen air support equipment in the UK is www.sussex-gauging.co.uk A few of our customers use them, they know the application, and they should be able to answer your questions. Good luck! IP: Logged |
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charliehagee Senior Member Posts: 9 |
posted July 06, 2004 12:56 PM
You can find Tubing Air Systems, and everything else you need for making multi-lumen tubing here: http://www.waynemachine.com/airsys.html and the main page www.waynemachine.com IP: Logged |
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louis33 Senior Member Posts: 85 |
posted July 06, 2004 04:33 PM
There are quite a few companies that provide that type of control, and the automation varies, depending on what you want to spend and what you are trying to accomplish. Some are strictly manual in nature, while others are fully automated with feedback to in-line measurement systems. As to the size changing, that depends on the line length (distance to the cutter from the die head) and the tooling design. The tooling design will affect the amount of air required, and the amount of air required will affect the pressure drop when the tube is cut. So the draw down ratio is important. It would be ideal to design the tool so that the amount of air required would be low enough that the line length (backpressure) would be greater than the air pressure needed to blow the tube up. That way there should be no or little change in dimension as there should be no or little pressure drop when you cut. Hope that makes sense IP: Logged |
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daniel04 Member Posts: 3 |
posted July 14, 2004 01:50 PM
You can also find high-accuracy air sources at www.extrusionsolutions.com that do not require an air compresser. These units have a digital interface, and compensate for changes in the ambient air pressure. IP: Logged |
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