Printing – Inkers – Roller
Reexamination Certificate
1999-04-23
2001-09-18
Asher, Kimberly L. (Department: 2854)
Printing
Inkers
Roller
C101S350600, C101S207000
Reexamination Certificate
active
06289807
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an ink duct for an ink unit of a rotary printing press. The ink duct has ink metering elements with all or selected surfaces coated with a substance of low surface energy.
DESCRIPTION OF THE PRIOR ART
U.S. Pat. No. 5,027,513 discloses a doctor blade made from PTFE.
In EP 07 32 205 A1, an ink duct bottom of an ink duct is coated with PTFE.
U.S. Pat. No. 4,070,964 shows a doctor blade coated with Teflon for reducing the friction between the doctor blade and the screen.
EP 02 46 708 A1 and NL-A 9300810 describe doctor blades coated with Teflon.
DE 43 30 047 A1 describes an applicator unit for applying highly viscous inks. This ink is formed into an ink roll. For improving the transfer of the ink to the receiving roller, compressed air is blown into the ink roll.
EP 06 63 289 A1 shows a closed ink chamber, whose interior is cylindrically designed for forming an ink roll in connection with low-viscosity inks.
SUMMARY OF THE INVENTION
The object of the present invention is directed to creating an ink duct.
In accordance with the present invention, this object is attained by providing an ink duct which includes ink metering elements. All or selected surfaces of the ink duct and/or the ink material elements are coated with a substance of low surface energy.
The advantages which can be achieved by means of the present invention in particular rest in that because of the coating of the inside of the ink duct as well as the coating of the metering elements, the surface energy and therefore the surface tension and therefore the frictional resistance to ink has been greatly reduced in respect to all surfaces which come into contact with the ink. Not only is the cleaning of the elements coming into contact with the ink possible, without effort, the ink can be better intermixed because of the reduced frictional resistance of the coated elements. Moreover, a so-called “ink roll formation” in the ink duct is furthered. This “ink roll formation” results in a more even wetting of the ink metering roller.
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Bull, S. J., Tribology of Carbon Coatings: DLC, Diamond and Beyond, Diamond and Related Materials, Bd. 4, Nr. 5-6, May 1, 1995, pp. 827-836.
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Kutzner Willi Albert Peter
Ruckmann Wolfgang Günther
Schafer Karl Robert
Schneider Georg
Asher Kimberly L.
Jones Tullar & Cooper PC
Koenig & Bauer Aktiengesellschaft
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