WEBCON Inc.
Rounded Uhle Box Lips






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PURPOSE

Rounding off of the surface of the lips of Vacuum Slots in a paper machine to create an intimate contact with the felt. This will

Improve paper CD uniformity, due to even suction across.
Reduce felt wear, by reducing contact stresses with the lips.

AREAS OF APPLICATION

  • Uhle Box
  • Pick-up Shoe
  • Dewatering Slot
METHOD OF SOLUTION

The problem is modeled as a taut felt subject to lateral vacuum  pressure
and solved numerically for
  • a single slot, computer program UHLE1, and
  • multiple slots in tandem, program UHLEm.

INPUT REQUIREMENT


1. Dimensions of the existing set-up, including end plugs.
2. Operating Vacuum
3. Felt Tension, pli or kN/m.
4. Vacuum, psi or mm Hg.
5. Felt Spec. or a small sample.

OUTPUT RESULT


AutoCAD drawing of the surface profile of the redesigned lip and the end plugs, plus instructions.

CASE HISTORIES

   

Although conformal lips have been designed for a number of paper machines, performance data  has not been made available.

The fact that request for a second and a third machine was made by the same mill indicates the success of the design.

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