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US 4,524,716 AGranted
Adjustable air knife
AssigneeAppleton Papers Inc.
InventorHans J. Mueller
Life of this patent
Estimating the term…
Abstract
An improved gas knife wherein a coating which is generally uniform across the width of a paper web can be applied thereto. The gas knife contains a flexible gas flow modification member located adjacent to the inside of the nozzle of the gas knife for modifying the flow of gas whereby the coating weight can be adjusted differentially across a web being coated.
Claims16
An adjustable gas knife, comprising:
- elongated nozzle means having an elongated nozzle opening for projecting a sheet of gas;
- elongated flexible gas flow modification means located within said nozzle for modifying the rate of flow of said gas;
- and
- differential adjusting means for selectively adjusting the position of said gas flow modification means relative to said nozzle opening at a plurality of positions along the length of said gas flow modification means to thereby selectively modify the rate of flow of said gas through said nozzle opening.
1 more element
An adjustable gas knife, comprising:
- a gas pipe connected with a supply of compressed gas, said gas pipe containing a plurality of openings located along one longitudinal surface thereof;
- an elongate upper blade located outside of said gas pipe and connected with said gas pipe;
- an elongate lower blade located outside of and connected with said gas pipe, said lower blade being arranged adjacent to and parallel with said upper blade to define an elongated nozzle opening and an elongate nozzle chamber located between said nozzle opening and said gas pipe openings;
- an elongate gas flow modification member located within said nozzle chamber and being arranged inside of said nozzle;
- adjusting means for adjusting the position of said flow modification member, said adjusting means comprising:
- a plurality of adjusting shafts arranged along the length of said gas knife, each of said adjusting shafts being connected at one end with said gas flow modification member and being connected at the other end with a wall of said gas pipe opposite to said gas pipe openings;
- and
- means for imparting motion to said adjusting shafts to thereby change the position of said gas flow modification member within said nozzle chamber.
5 more elements
A coating apparatus, comprising:
- web support means for supporting a web of material to be coated;
- conveying means for conveying said web of material;
- coating means for applying a coating material to at least one surface of said web;
- and
- an elongate adjustable gas knife arranged adjacent to said coated surface of web material, said gas knife including, elongate nozzle means having an elongated nozzle opening for projecting a sheet of gas against said coated surface, elongated flexible gas flow modification means located within said nozzle means for modifying the rate of flow of said gas, and differential adjusting means for selectively adjusting the position of said gas flow modification means at a plurality of positions along the length of said gas flow modification means to thereby selectively modify the rate of flow of said gas through said nozzle opening.
2 more elements
Dependencies are inferred from the claim text.