where expertise comes together - since 1996

Web's Largest Portal of Nondestructive Testing (NDT)
Open Access Database (Conference Proceedings, Articles, News), Exhibition, Forum, Network

All Forum Boards
Technical Discussions >
multi-layer thickness measurement.
Career Discussions
Job Offers
Job Seeks
Classified Ads
About NDT.net
Articles & News

IDEKO S.Coop
We provide Precision, Quality, Reliability and Productivity in manufacturing processes among our knowledge of Inspection and measurement technologies

703 views
04:41 Jan-05-2000

Doo Chul Park

R & D
Worltech R&D Center,
South Korea,
Joined Oct 1999
5
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!




 
00:59 Jan-06-2000

Rolf Diederichs

Director, Editor, Publisher, Internet, PHP MySQL
NDT.net,
Germany,
Joined Nov 1998
602
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!




 


© NDT.net - The Web's Largest Portal of Nondestructive Testing (NDT) ISSN 1435-4934

Open Access Database, |Conference Proceedings| |Articles| |News| |Exhibition| |Forum| |Professional Network|