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| Author | Topic: Screen Change Continous Filters |
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fernando1000 Member Posts: 3 |
posted October 22, 2002 05:30 PM
   
Hello Im having too much shutdown time in my critical continous process of extrusion, where i produce the main component of the final product arterial set, my process requires four changes per day of the screens filter caused by worn , who can help me to find any fixture or tool to make the process continous, or if somebody knows about a screen filter that can resist high temperatures (around 396 F ). Our actual screens burns every 5 hours aprox... IP: Logged |
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Peter P Senior Member Posts: 61 |
posted October 22, 2002 06:39 PM
Fernando, There are various systems on the market. Dynisco have one - see Continuous Flow Wheel Screen Changer Kreyenborg also produce a continuous system. Regards, Peter P IP: Logged |
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Steve H Moderator Posts: 386 |
posted October 25, 2002 02:05 PM
Hello Fernando Welcome to the forum. Having to change screens four times a day seems excessive, Are you using reclaimed material? What material are you using for your screens at present, I'd recommend trying stainless steel mesh. Also your could try experimenting with different screen packs- What material are you extruding? Steve Hodgson IP: Logged |
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Peter P Senior Member Posts: 61 |
posted October 26, 2002 03:31 PM
Fernando, In the course of another job that I'm doing, I've just come across a very neat British continuous screen changing system - see AutoScreen [This message has been edited by Peter P (edited 10-26-2002).] IP: Logged |
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Steve H Moderator Posts: 386 |
posted October 26, 2002 04:12 PM
Auto Screen and Hi-Tech are quite a good concept, unless your melt is heavily contaminated. Then you need something with a bit more horsepower. Steve H IP: Logged |
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BrianAndLiz Senior Member Posts: 42 |
posted November 14, 2002 02:24 PM
There are continuous melt-filter systems out there, we used them out at PACTIV on the foamlines. Dunno the maker, but it consisted of a rotating plate half in half out of the melt. It rotated at a very slow rate, changing the screen as it went. The operator would then pick the used screens out, and replace them. Only tool needed was a screwdriver to pry the screen out.. (and gloves! Very hot! Got scar to prove it!  )IP: Logged |
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Bob Cunningham Senior Member Posts: 115 |
posted November 18, 2002 11:15 AM
Depending on your application, you may also be able to use an automatic backflushing design like the ones made by Erema - http://www.erema.at/index.php?lg=2&seite=45 They automatically backflush when the pressure differential becomes too high, enabling you to re-use the same screen for much longer (typically 30 - 50 backflush cycles). Then when it is time for a screen change, the unit brings two screens out to be changed while two screens stay in the melt stream, eliminating downtime for screen changes. -Bob Cunningham IP: Logged |
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StrapGod Senior Member Posts: 23 |
posted December 24, 2002 12:12 PM
I would be interested in knowing what type of screen filters you are using now (material type, mesh size(s), etc.) and also the number of screens you are using in your line? Also, has this always been or recently changed for some reason? As others have suggested, backflushing could be very benificial. Additioanlly, Superplated behind the screen as well as alternate weave types could prove helpful with your current process. Post more info and we could probaly help more - good luck!! IP: Logged |
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