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 Extrusion, Single Screw
 insulating t/dies single screw extruders
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john green Member Posts: 4 |
posted August 19, 2005 11:22 AM
   
Hi can you advise that if I were to insulate our t/dies which are from 1.5mtrs to 2.5mtrs coat hanger style to reduce heat loss would this cause any problems this is purely an energy saving exercise also if I did this to the barrels would I have a problem with not being able to get rid of exess heat IP: Logged |
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Tom C Moderator Posts: 578 |
posted August 19, 2005 04:56 PM
John, Insulating the die will change the temperature of the inner surfaces of the die. The amount and type of of change depends on the operating conditions. Whether the changes influnce the flow of the polymer through the die much, good or bad also depends on many factors. I believe die insulation will improve the process in the long run, but some adjustments in zone temperature may be required. Insulation of the barrel is more complex. Usually it is a good idea, but if your process uses air cooling your out of luck. Water cooled barrels are the only candidates for insulation, except in special circumstances.
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Tom Cunningham
Extrusion Technical Services www.ExtrusionTechnicalServices.com IP: Logged |
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joeex Senior Member Posts: 5 |
posted August 22, 2005 04:17 AM
Hi John would be interested to Know what you are extruding and what type of extruder you have. And on a personal note have been looking at a job in Milton Keynes recently company called Parpak any Knowledge or feedback appreciated my E-Mail is mckjose8@aol.com Thanks Joe IP: Logged |
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john green Member Posts: 4 |
posted August 22, 2005 04:58 AM
Hi Joe We are a bubble film manufacturer We have various extruders being Italion , japanese , taiwanese some with the choke bar for film width others with the pinching bolts Parpak I have heard of but not quite sure what they produce I do know its not bubble wrap Maybe we could arrange a visit if you are over my email is j.green@sansetsu.co.uk if you would like to get in touch john quote: IP: Logged |
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john green Member Posts: 4 |
posted August 22, 2005 05:08 AM
Hi Tom Thankyou for your reply a few more questions regarding the t/die What would you suggest for the insulation ? I have sourced a material called sindanyo which is light weight but has to be cut to size and is not flexible I have heard of insulation blankets have you ? the barrel is air cooled with pid control then our process is run on water cooled rollers with the addition of air cooling My worry is if I insulate the barrel with the additional frictional heat will I create cooling problems john quote: IP: Logged |
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ravi Senior Member Posts: 9 |
posted August 25, 2005 04:35 AM
Insulation is a good idea but has various problems. When u stop the machine the residual material will degrade as the die will take a long time to cool down. I have used fibre glass wool packed in a fibre glass cloth very effectively. It must be removable at the time of machine shut down. The power saving is enormous when using this insulation. If ur process produces frictional heat in the die during process then this insulation will prove disastrous. regards, ravi IP: Logged |
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john green Member Posts: 4 |
posted August 25, 2005 09:55 AM
Hi Ravi Thankyou for the advice I am looking into an insulation jacket for our dies makes sense to remove on cool down John IP: Logged |
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