Düsseldorf, Germany — Technology provider to the blown film extrusion market D.R. Joseph showed a series of new developments at K 2019.
The company, which has its headquarters in Arlington, Texas, showed the automatic layflat control, or ALC. Speaking about the system, DRJ Marketing Manager Michael Pilolli said: "ALC improves output by reducing the amount of trim typically taken on blown film lines. This is achieved by measuring and controlling film stretch and shrink as it makes its way down the blown film tower, with a flat-width bar near the winder. This is in addition to ultrasonic sensors measuring bubble diameter above the frost line."
Pilolli continued: "For the ALC, we teamed up with Swiss company Kundig to integrate their flat-width measurement bar. This uses infrared sensors to measure the flattened web, which in turn provides final flat-width measurement used by the ALC to correct for width drift as caused by stretch and shrink."
While width is typically controlled as the film makes its way up the tower, Pilolli went on to explain that stretch and shrink occur as the film makes its way down. By measuring both sides of the process, DRJ width control systems are better able to control final product dimensions.