Coating apparatus – Solid member or material acting on coating after application – Running length work
Reexamination Certificate
2000-06-13
2002-12-10
Edwards, Laura (Department: 1734)
Coating apparatus
Solid member or material acting on coating after application
Running length work
C118S126000, C118S203000, C118S261000, C162S281000
Reexamination Certificate
active
06491754
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention.
The present invention relates to doctor blades, and, more particularly, to a doctor blade for leveling and/or metering a layer of liquid or viscous coating medium.
2. Description of the Related Art.
A doctor blade is used to level and/or meter coating medium onto a moving background. With direct application of the coating medium, a moving background is a material web, such as a paper or cardboard web. With indirect application, a moving background is the surface of a transfer element which transfers the coating medium onto the material web.
It is known for a doctor blade to be formed of materials such as high carbon spring steel, beryllium copper, stainless steel or fiberglass. A problem is that these materials have generally poor wear characteristics.
What is needed in the art is a doctor blade that has higher strength and better wear characteristics.
SUMMARY OF THE INVENTION
The present invention provides a doctor blade formed of a high strength composite material, such as carbon fiber. Also provided are various arrangements for positioning such a doctor blade relative to the moving background.
The invention comprises, in one form thereof, an apparatus for one of direct and indirect application of a coating medium onto a traveling fiber material web. At least one doctor element applies and/or meters the coating medium, and is formed of a carbon fiber material.
An advantage of the present invention is that, because of the higher strength and wear characteristics of the carbon fiber material, the doctor blade has a longer useful life.
Another advantage is that the doctor blade has better lubricity because of the carbon material.
Yet another advantage is that the position of the doctor blade relative to the moving background can be closely controlled.
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J. A. Kent,Riegel's Handbook of Indrustrial Chemistry, Ninth Edition, pp. 789-791, 1992.*
Kirk-Othmer,Encyclopedia of Chemical Technology, Fourth Edition, pp. 1-5, 16, and 17, 1993.
Eng James A.
Graf Edwin X.
Edwards Laura
Taylor & Aust P.C.
Voith Sulzer Paper Technology North America Inc.
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