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- since 1996 -
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Technical Discussions
Doo Chul Park
R & D
Worltech R&D Center, South Korea, Joined Oct 1999, 5

Doo Chul Park

R & D
Worltech R&D Center,
South Korea,
Joined Oct 1999
5
04:41 Jan-05-2000
multi-layer thickness measurement.

Dear Sir

I'm looking for in-line system for multi-layer thickess measurement.
I want to measure wall thickness of Pipe.
Pipe is consist in PB(poly Buthylene) and EVOH(thin plate).
Total Diameter of Pipe : 10mm -25mm
total wall thickness : 1.6mm - 3mm
Wall Configuration:
Outter wall Insulation layer Inner wall
PB(0.7mm-1.5mm) EVOH(fixed 0.1mm) PB(0.7mm-1.5mm)

there is no air gap between EVOH and PB.

Any comment will be appreciated!
Thank you!




 
 Reply 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 608

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
608
00:59 Jan-06-2000
Re: multi-layer thickness measurement.
I am pleased to see so often rising topics of my old favorite market of ultrasonic testing in plastic pipe extrusion.

You may read the article "UT in Plastic pipe extrusion" which is a guide book about the state of the art (http://www.ndt.net/article/rohrext/rohre_e.htm). It should not be a problem to measure the wallthickness of the extruded multilayer pipe you requested. Even a single layers could be evaluated, this is described in the chapter - Coextrusion Layer Thickness Measurement.
Anyway, be carefully when using a simple digital thickness gage with no echo display. The multilayer can cause interferences and phase shifts which needs an appropriate gate and threshold setting. An echo display of a typical problem is depicted at http://www.ndt.net/article/rohrext/image/multilay.gif.

Rolf Diederichs
----------------
: Dear Sir

: I'm looking for in-line system for multi-layer thickess measurement.
: I want to measure wall thickness of Pipe.
: Pipe is consist in PB(poly Buthylene) and EVOH(thin plate).
: Total Diameter of Pipe : 10mm -25mm
: total wall thickness : 1.6mm - 3mm
: Wall Configuration:
: Outter wall Insulation layer Inner wall
: PB(0.7mm-1.5mm) EVOH(fixed 0.1mm) PB(0.7mm-1.5mm)

: there is no air gap between EVOH and PB.

: Any comment will be appreciated!
: Thank you!




 
 Reply 
 

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