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Hillger NDT GmbH
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Technical Discussions
Sherry Whitaker
Sherry Whitaker
06:20 Apr-28-2003
measuring thickness of coextruded plastic

I am trying to find a sound analytical technique to measure the thickness of a layer of co extruded crystallized plastic. Approximate total thickness of about 20-25ml , the top layer needing measured is around 5 to 10% of total.

Any info you can provide will be appreciated.


 
 Reply 
 
Dr. Patel
Dr. Patel
04:57 Apr-29-2003
Re: measuring thickness of coextruded plastic
: I am trying to find a sound analytical technique to measure the thickness of a layer of co extruded crystallized plastic. Approximate total thickness of about 20-25ml , the top layer needing measured is around 5 to 10% of total.
.
: Any info you can provide will be appreciated.
.
We have measured plastic thickness down to 100 micron with micron accuracy. The system can be used for on-line application. If you are interested please contact me at fallon@netcom.ca. We are using very simple pulse echo technique with broadband pulse of 50 MHz. Some error may occur due to nature of plastic where velocity of material may change.
Regards
Dr. Patel
Fallon Ultrasonics Inc
905-388-7853
Fax 905 387 5897


 
 Reply 
 
Neil Burleigh
Sales
Krautkramer Australia Pty Ltd, Australia, Joined Dec 2002, 158

Neil Burleigh

Sales
Krautkramer Australia Pty Ltd,
Australia,
Joined Dec 2002
158
05:29 May-08-2003
Re: measuring thickness of coextruded plastic
: : I am trying to find a sound analytical technique to measure the thickness of a layer of co extruded crystallized plastic. Approximate total thickness of about 20-25ml , the top layer needing measured is around 5 to 10% of total.
: .
: : Any info you can provide will be appreciated.
: .
: We have measured plastic thickness down to 100 micron with micron accuracy. The system can be used for on-line application. If you are interested please contact me at fallon@netcom.ca. We are using very simple pulse echo technique with broadband pulse of 50 MHz. Some error may occur due to nature of plastic where velocity of material may change.
: Regards
: Dr. Patel
: Fallon Ultrasonics Inc
: 905-388-7853
: Fax 905 387 5897
.
Some years ago I was involved in trying to measure the total wall thickness of co extruded plastic containers. The total thickness was about 2.0 - 2.5 mm which comprised of three layers with the centre layer being made from recycled plastic.Using ultrasonics, a digital caliper, we were not able to penetrate the full thickness and were only ever able to measure the first layer which was about 0.5mm thick. We used a 22MHz probe on a gauge type CL202P.
Therefore depending on the grain size of the crystalized plastic outer layer you should try using a shockwave probe in the frequency of 15 - 25 MHz plus a UFD high frequency capabilities or a Krautkramer thickness gauge from the CL range.
If all this doesn't work can you send a sample to us for trials.

Regards



 
 Reply 
 

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