US PATENT SUBCLASS 162 / 336
.~.~.~ Flow box, slice, and/or approach flow

Current as of: June, 1999
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162 /   HD   PAPER MAKING AND FIBER LIBERATION

232  DF  APPARATUS {22}
289  DF  .~ Running or indefinite length product forming and/or treating means {19}
315  DF  .~.~ Means directing stock into contact with molding surface {7}
336.~.~.~ Flow box, slice, and/or approach flow {6}
337  DF  .~.~.~.~> Recirculation skimming or excess stock take-off
338  DF  .~.~.~.~> Transversely crossing inlet into flow box
339  DF  .~.~.~.~> Closed to atmosphere {1}
341  DF  .~.~.~.~> Vibratile or moving member treating stock {1}
343  DF  .~.~.~.~> With vanes or pulp stream dividing means
344  DF  .~.~.~.~> Slice {3}

DEFINITION

Classification: 162/336

(under subclass 315) Apparatus in which the directing means (1) spreads slurry into a thin sheet for discharge onto the mold, (2) provides a hydrostatic or pressure head to give the slurry the requisite speed of discharge onto the mold, and/or (3) keeps the slurry sufficiently agitated to prevent flocculation before discharge onto the mold.

(1) Note. The devices of this subclass are positioned between the slurry producing or conditioning means and the forming means, and may be in the nature of a large box to steady the flow of stock, or in the nature of a spreading nozzle only directing the slurry on the forming means. Included also are subcombinations of flow arrangements into the flow box to produce particular effects on the slurry.

(2) Note. The devices of this subclass deliver the stock onto a traveling endless mold, usually either an endless flexible belt or a foraminous cylinder.

(3) Note. The subject matter of this group deals with the problem of transforming the relatively small cross-section output of a feed pump into a wide flat stream directed against the moving endless mold surface and the subject matter includes within its confines all structure necessary

for so shaping the flowing fluid slurry stream. The devices of this and the indented subclasses are known in the art as flow box, head box, slice, inlet, approach flow devices.