D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
92/17.2
D21F 1/02 (2006.01) D21F 1/00 (2006.01)
Patent
CA 1221261
ABSTRACT A method and apparatus for delivering a multi- layer stock jet to a forming surface in a papermaking machine with a multilayer headbox having a slice chamber formed by side walls and top and bottom walls terminating in lip members defining a slice opening and at least one relatively rigid stock separating partition fixed at its upstream end and attached to the side walls at points downstream of and at a distance from said upstream end and dividing the slice chamber into separate slice channels through which separate papermaking stocks are fed by separate pumps and discharged through the slice opening to the forming surface, in which ultrasound distance measuring devices are used to detect any deviation of the partition from a straight line connecting the points of its attachment to the side walls of the slice chamber and at least one of the stock feeding pumps is con- trolled in response to any detected deviation to reduce the deviation to a negligible value.
431225
Gowling Lafleur Henderson Llp
Valmet-Kmw Aktiebolag
LandOfFree
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