Paper forming activity control with lifting variable inertial stimulation blades with limited-vent indented-surfaces
AssigneeThermo Fibertek Inc.
InventorsJohn A Neun, Jeffrey P. Bachand, Keith Carlton, Daniel Grogan
Life of this patent
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Abstract
A papermaking apparatus such as a Fourdrinier table which includes a long blade and a trail blade. In the first aspect of the invention, the long blade includes an upper undulated surface with vents passing from the upper undulated surface to the lower surface of the long blade which is at substantially atmospheric pressure. In the second aspect of the invention, the trail blade includes an elevator-type device for adjusting the vertical position of the trail blade. The first and second aspects may be used independently or simultaneously.
Claims15
In a fourdrinier portion of papermaking apparatus comprising:
- a non-planar lead blade for generating activity in stock forming a sheet on a forming fabric, said blade having a non-planar upper surface and a lower surface, said lead blade being mounted in a fixed position;
- a rearwardly spaced trail blade with a gap formed between the lead blade and trail blade for drainage;
- a single layer path for forming fabric which extends over said lead blade and said trail blade;
- and
- means for adjusting the vertical height of the trail blade with respect to the lead blade to change the hydro dynamics of the fluid passing thereover so as to control activity in the fluid and the drainage that occurs in the gap between the lead blade and the trailing blade.
In a papermaking apparatus comprising:
- a long blade mounted in a fixed position with an upper surface and a lower surface, said upper surface including undulations;
- a trail blade spaced from said long blade thereby defining a gap through which water drains;
- a forming fabric path which extends over said long blade and said trail blade;
- means for adjusting a vertical height of said trail blade;
- said long blade being longer than said trail blade in a machine direction;
- and
- said long blade including at least two groups of vent apertures extending from said upper surface to said lower surface for drainage of liquid therethrough, each of said at least two groups of vent apertures further including independent means for throttling drainage of liquid therethrough.
Dependencies are inferred from the claim text.