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Technical Discussions
Qasim
Qasim
03:38 Mar-07-2005
Online measurement of Layer thickness in coextrusion

Hi All!

I´m a student of Polymer Science in Germany, I´m working on the "Online measurement of Layer thickness in coextrusion", any text material, literature or web link will be of great help...........waiting for your reply....

Best regards,

Qasim.


 
 Reply 
 
Rolf D.
Director,
NDT.net, Germany, Joined Nov 1998, 617

Rolf D.

Director,
NDT.net,
Germany,
Joined Nov 1998
617
05:00 Mar-07-2005
Re: Online measurement of Layer thickness in coextrusion
----------- Start Original Message -----------
: Hi All!
: I´m a student of Polymer Science in Germany, I´m working on the "Online measurement of Layer thickness in coextrusion", any text material, literature or web link will be of great help...........waiting for your reply....
: Best regards,
: Qasim.
------------ End Original Message ------------

You can find something about this topic in two older articles:

Ultrasonic Testing in Pipe extrusion
Rolf Diederichs
http://www.ndt.net/article/rohrext/rohre_e.htm

Ultrasonic In Mould Measurement
Rolf Diederichs
http://www.ndt.net/article/imm/imm_e.htm

Here the BAM Berlin writes in German about tubes of 0,05 to 0,2 mm layer thickness

Die Messung der Materialdicke von sehr dünnen Polymer-Schläuchen
Roland Sickert, Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin
DGZfP-JAHRESTAGUNG 2002
http://www.ndt.net/article/dgzfp02/papers/p06/p06.htm

You may find by using the seach some more articles, e.g.

PC Controlled Automatic Systems for Thickness Gauging with Ultrasound
Klaus Volkmann, Siegmar Schulz, KRAUTKRÄMER GmbH & Co. oHG, D - Hürth
WCNDT2000
http://www.ndt.net/article/wcndt00/papers/idn155/idn155.htm

IN-LINE ULTRASONIC MONITORING OF POLYMER BLENDING IN A TWIN-SCREW EXTRUDER
Z. Sun, J. Tatibouët , C.-K. Jen1, H. L. Liang, and C.-Y. Su
Industrial Materials Institute, National Research Council Canada, Boucherville, Quebec, Canada;
WCNDT2004
http://www.ndt.net/article/wcndt2004/html/htmltxt/726_liang.htm


The IKV in Germany/Aachen has investigated ultrasonic in plastic machine process.

What is your product ? a pipe extrusion or blow mould hollow body? a sheet extrusion?
Do you want to measure in the extrusion die or down in the cooling process?

Rolf Diederichs


 
 Reply 
 
Rolf D.
Director,
NDT.net, Germany, Joined Nov 1998, 617

Rolf D.

Director,
NDT.net,
Germany,
Joined Nov 1998
617
00:16 Mar-08-2005
Re: Online measurement of Layer thickness in coextrusion

Just noticed this source on the Web Site of Panametrics-NDT.


Application Note 930-134:
Thickness Mesurement of Multilayer Plastic Food and Beverage Containers

Application:
Measurement of individual layers and total thickness in multilayer plastic food and beverage containers.

Background:
Many containers for packaged food products and many carbonated beverage bottles contain a gas barrier layer between two layers of structural plastic such as polyvinyl choride, polycarbonate, or polyethylene. The thin barrier layer, which is usually made of ethylene vinyl alcohol (EVOH), polyvinylidence choride (PVDC), polyester, acrylic copolymer, or similar material, is designed to preserve freshness and lengthen shelf life by preventing the migration of gas in or out of the package, for example to keep oxygen out of a frozen food package or to keep carbon dioxide inside a beer bottle.

read more at:
http://www.panametrics-ndt.com/ndt/ndt_technology/beverage_containers.html



 
 Reply 
 
Qasim Shaikh
Qasim Shaikh
07:00 Mar-17-2005
Re: Online measurement of Layer thickness in coextrusion
We are working on both sheet and pipe extrusion, the main thing i need to know is that to measure transparent layers we can use optical means, but what about coloured layers?

pls also advice if you can recommend any text books, as my project is basically literature search and any additional information will be of great help.

Awaiting your reply,

Mit freundlich grüßen.....Qasim


----------- Start Original Message -----------
: : Hi All!
: : I´m a student of Polymer Science in Germany, I´m working on the "Online measurement of Layer thickness in coextrusion", any text material, literature or web link will be of great help...........waiting for your reply....
: : Best regards,
: : Qasim.
: You can find something about this topic in two older articles:
: Ultrasonic Testing in Pipe extrusion
: Rolf Diederichs
: http://www.ndt.net/article/rohrext/rohre_e.htm
: Ultrasonic In Mould Measurement
: Rolf Diederichs
: http://www.ndt.net/article/imm/imm_e.htm
: Here the BAM Berlin writes in German about tubes of 0,05 to 0,2 mm layer thickness
: Die Messung der Materialdicke von sehr dünnen Polymer-Schläuchen
: Roland Sickert, Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin
: DGZfP-JAHRESTAGUNG 2002
: http://www.ndt.net/article/dgzfp02/papers/p06/p06.htm
: You may find by using the seach some more articles, e.g.
: PC Controlled Automatic Systems for Thickness Gauging with Ultrasound
: Klaus Volkmann, Siegmar Schulz, KRAUTKRÄMER GmbH & Co. oHG, D - Hürth
: WCNDT2000
: http://www.ndt.net/article/wcndt00/papers/idn155/idn155.htm
: IN-LINE ULTRASONIC MONITORING OF POLYMER BLENDING IN A TWIN-SCREW EXTRUDER
: Z. Sun, J. Tatibouët , C.-K. Jen1, H. L. Liang, and C.-Y. Su
: Industrial Materials Institute, National Research Council Canada, Boucherville, Quebec, Canada;
: WCNDT2004
: http://www.ndt.net/article/wcndt2004/html/htmltxt/726_liang.htm
:
: The IKV in Germany/Aachen has investigated ultrasonic in plastic machine process.
: What is your product ? a pipe extrusion or blow mould hollow body? a sheet extrusion?
: Do you want to measure in the extrusion die or down in the cooling process?
: Rolf Diederichs
------------ End Original Message ------------




 
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