Headbox apparatus
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United States of America Patent
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Aug 23, 2016
Grant Date -
Mar 6, 2014
app pub date -
Sep 4, 2012
filing date -
Sep 4, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A headbox apparatus for a papermaking machine is disclosed. The headbox apparatus defines a flow path for stock flowing between an upstream header and a downstream slice lip. Each block and an adjacent block of a plurality of blocks defines therebetween a flow tube for the flow therethrough of the stock. An upstream ramp is defined by a first surface for generating an upstream vortex adjacent to the first surface. A downstream ramp is defined by a second surface for generating a downstream vortex adjacent to the second surface. Adjacent blocks also generate downstream vortices which rotate in opposite directions relative to each other within the flow tube so that impact of the upstream and downstream vortices on a flow consistency and a velocity uniformity of the stock is reduced.
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