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1286 views
06:16 Nov-01-2001
Dongbiao Wang
Can UT be used for on-line monitoring of Polymer Processing

I want to study the PVC properties in extruder with on-barrel ultrasonic transducer. But there are some problems.
(1). We can not get the signal with Pulse-echo mode because of
the particle structure of PVC solid in solid conveying zone.
(2). Can we get the PVC melting such as melting pool thickness
or melting film thickness.
(3). In metering zone, can we get the PVC melting properties for example melt viscosity (in rheological meaning) by UT?
If someone gives me some idea about, I will appreciate his help very much.



 
06:55 Nov-01-2001

Dr. Patel

R & D, Consultant to Universities/Industries
Fallon Ultrasonics/McMaster University,
Canada,
Joined May 2001
20
Re: Can UT be used for on-line monitoring of Polymer Processing : I want to study the PVC properties in extruder with on-barrel ultrasonic transducer. But there are some problems.
: (1). We can not get the signal with Pulse-echo mode because of
: the particle structure of PVC solid in solid conveying zone.
: (2). Can we get the PVC melting such as melting pool thickness
: or melting film thickness.
: (3). In metering zone, can we get the PVC melting properties for example melt viscosity (in rheological meaning) by UT?
: If someone gives me some idea about, I will appreciate his help very much.
:
.Dr. Balakrshinan who was at Mississippi State University has done some work many years ago and you can get some publications by him in Journals. You need to measure very accurately time or phase of the signal using shear wave transducers. Regarding measuring thickness you can use longitudinal waves and should work. We have used similar setup with polymer companies to measure the crosslink density and were successful. Thus, your question on UT the answer is it does work and you can use UT technique (which is indirect method)provided that you have caliberated the system.


Regards

Dr. Patel


 
09:48 Nov-09-2001

Rolf Diederichs

Director, Editor, Publisher, Internet, PHP MySQL
NDT.net,
Germany,
Joined Nov 1998
602
Re: Can UT be used for on-line monitoring of Polymer Processing : I want to study the PVC properties in extruder with on-barrel ultrasonic transducer. But there are some problems.
: (1). We can not get the signal with Pulse-echo mode because of
: the particle structure of PVC solid in solid conveying zone.
: (2). Can we get the PVC melting such as melting pool thickness
: or melting film thickness.
: (3). In metering zone, can we get the PVC melting properties for example melt viscosity (in rheological meaning) by UT?
: If someone gives me some idea about, I will appreciate his help very much.
:
--------------------


Dongbiao Wang,

I noticed that you have been posted already your interest in
this topic as a reply to the former message:
http://www.ndt.net/wshop/forum/messages/406.htm
UT on polymers
Posted by: Al Rashid Wahab, E-mail: arwahab@pl.jaring.my,
on October 14, 1998 at 02:06:16:


It seems that you could not receive satisfied information,
so you may need contacts far from this forum.
You should contact the IKV Institute of Plastics Processing at Aachen University of Technology:
http://www.rwth-aachen.de/ikv/Ww/english.html
or in particular:
http://www.rwth-aachen.de:80/ikv/Ww/analys/ikv_anae.html
Analysis methods for materials testing
http://www.rwth-aachen.de:80/ikv/Ww/abt.fvk/pure.html
Ultrasonic measuring is used to analyse the foaming and crosslinking of PU systems
during processing. Mechanical, thermal and rheological measuring equipment is available for
assessing component properties and processing behaviour.

The IKV has done a lot of research and used transducers from Krautkramer.
You may contact Dr. Splitt head of the transducer
development, see his forum profile at http://www.ndt.net/wshop/profile/profile.php3?ID=187

Good luck!

Rolf Diederichs



 


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