Method and apparatus for delivering a multilayer jet of stock to a forming surface in a papermaking machine
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United States of America Patent
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Mar 4, 1986
Grant Date -
N/A
app pub date -
Jun 22, 1983
filing date -
Jul 6, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for delivering a multilayer 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 controlled in response to any detected deviation to reduce the deviation to a negligible value.
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