(in a papermaking machine) the container in which cleaned pulp is collected for uniform distribution across the wire.
headrail ( def 2 ).

head + box1

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Example sentences
The figure is a photo of the culvert headbox used in the study under
The pulp, along with water, flows at a controlled rate through a headbox and
  onto a moving wire-mesh screen.
The device, which is retrofitted into an existing paper machine's headbox,
  disperses wood fibers in all directions.
Modifications need to be made so that the flow will start at the overflow weir,
  rather than in a headbox.
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