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Home >> Technical Articles >>Test Crosslinking of PEX Pipe In-Line
Test Crosslinking of PEX Pipe In-Line
Time: 2008-12-23
     WEB EXCLUSIVE The first non-destructive test device to indicate the level of crosslinking in PEX-A (peroxide-cured) HMW-HDPE pipe for hot water and in-floor heating was recently sold in Europe by Inoex GmbH in Germany (U.S. office in Lancaster, Pa.). The vision-based test device is mounted downstream in the process after the pipe has been extruded, crosslinked in an infrared oven, and cooled in a water bath. Crosslinking lowers the PE density and makes it translucent. Optical testing isn’t designed to replace chemical testing of cross-linking, but to give an early warning of a reduction in cross linking in time to correct the process, since off-line chemical testing of cut samples may take days for results. The non-destructive system currently tests cross-linking at up to 24 m/min. but could handle higher line speeds, Inoex says. Inoex first presented the curing oven (developed with Crosslink Oy in Finland) and the test device at the K 2007 show in Dusseldorf. The system is available at Inoex for customer testing.
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