Rotary scanner gauge for blown film systems
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NDC Infrared Engineering product story
Edited by the Engineeringtalk editorial team
Nov 10, 2005
NDC Infrared Engineering has introduced a family of rotary scanners specifically designed for blown film systems.
NDC Infrared Engineering has introduced a family of rotary scanners specifically designed for blown film systems.
These products allow fast measurement of the blown film bubble - as fast as a complete scan per minute, depending on the bubble diameter - to significantly improve the feedback time for the gauging system to generate a polar plot of the bubble profile.
Scanners for blown film systems with bubbles as large as 2.7m in diameter are available.
Without this scanner, the gauging system must wait for the device being used to randomise profile variation (for example, oscillating die or haul-off) to complete one rotation before an update can occur.
This can take several minutes, versus a scan per minute that is achievable with the rotary scanner.
"This new scanner provides a number of benefits to the blown film processor", said Hector Marchand, NDC Vice President of Marketing.
"By improving the speed of the blown film bubble measurement by a factor of three times or more, processors can start-up faster, and reduce the amount of scrap generated at start-up".
"In addition, these scanners are essential for good Auto Profile control via heated die bolts or segmented air rings".
The rotary scanner is designed to be installed below the collapsers and above the frost line of the blown film system to insure the best quality of measurement possible.
Several diameter rotary scanners are available to match the needs of the individual process.
The rotary scanner includes NDC's TPP (telescopic probe positioner) unit to insure that the company's measurement sensor maintains proper measurement position to the bubble, even if bubble position/diameter change due to process changes.
The new Rotary Scanner and TPP unit have been installed on several blown film installations in North America, Asia and Europe, and are providing excellent performance.
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