Method of controlling basis weight profile using multi-layer...

Details Method of controlling basis weight profile using multi-layer... Method of controlling basis weight profile using multi-layer...

D - Textiles, Paper

21

F

D21F 7/06 (2006.01)

Patent

CA 2294697

The stock approach piping to a multi-layered headbox can be modified to include a dilution water header that independently supplies dilution water, such as whitewater, to multiple CD segments or zones of the tube bank which supply stock to each layer. The CD basis weight profile of the final sheet is monitored and, in response to the measured CD profile, dilution water flow is increased or decreased to those tube bank segments that need their consistency altered. By selectively controlling the basis weight of distinct segments of the CD profile for each layer, a more uniform sheet can be produced.

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