Automatic valve calibration of a blown-film extrusion apparatus

Details Automatic valve calibration of a blown-film extrusion apparatus Automatic valve calibration of a blown-film extrusion apparatus

B - Operations, Transporting

29

C

B29C 49/78 (2006.01) B29C 49/04 (2006.01)

Patent

CA 2717429

The present invention relates to a method of automatically calibrating a valve in a fluid flow path of a blown-film extrusion apparatus. The calibration process detects and measures a first and second pressure drop in the flow characteristic, as well as the valve position and time. The process further detects time required to achieve a steady-state in the flow characteristics. These measurements are recorded and used in calculating appropriate valve positions.

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