Printing – Printing members – Rolling contact
Reexamination Certificate
1999-10-15
2001-03-20
Eickholt, Eugene (Department: 2854)
Printing
Printing members
Rolling contact
C492S050000, C492S052000
Reexamination Certificate
active
06202557
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the invention.
The present invention relates to a roll for applicator systems for application of a medium onto a traveling material web, notably a paper or cardboard web.
2. Description of the related art.
A roll for applicator systems for application of a medium onto a traveling material web is known, e.g., from the German Patent Document No. DE 40 22 334 C2. This patent document describes a method for operation of an applicator and also illustrates an applicator roll possessing a supporting metal core with a polyurethane cover.
Known from the German Patent Document No. DE 296 09 007 U1 is a printing press roll that also features a metallic core as a support element and possesses a cover of fiber composite material.
Due to their structure with a heavy metal core, such rolls have a large inertia and, therefore, in order to achieve short start-up times, require large drive motors and heavy moving elements. Besides, due to an asymmetric structure of the roll or of the metal pipe used (e.g., due to blowhole inclusion) or due to manufacturing inaccuracies, the roll frequently fails to run smoothly, which is difficult to master by balancing. Such unstable rotation of the roll results, especially with elevated quality demands, in a non-uniform coating profile in the machine direction.
These roll configurations today achieve balance ratings of Q=1.6 up to possibly Q=1.0 with running truths up to 50 &mgr;m when taking particular measures.
SUMMARY OF THE INVENTION
The present invention provides an applicator system roll whose smooth running is improved over prior rolls.
Accordingly, the inventors have recognized the favorableness of making the core of a roll from fiber composite material, such as glass-fiber-reinforced plastic (GFRP) or carbon-fiber-reinforced plastic (CFRP).
This roll structure leads advantageously to a considerable weight reduction of the roll and, thereby, to lower unbalance forces. Thus, peripheral speeds above 1800 m/min and roll widths over 8 meters can be achieved at unchanged balance rating.
Moreover, the better weight-stability ratio of the fiber composite material considerably reduces the roll flexure that is caused by its dead weight and/or by temperature effects. Besides, such a roll tends considerably less to inherent vibrations than a roll with a metal core, due to the smaller mass and the better damping properties of the fiber composite material. Overall, the above advantages result in an appreciably better and uniform coating profile.
Further advantages of the low weight are that the support structures become more lightweight and low cost, the drive units can be sized down and/or shorter start-up times are achievable.
Furthermore, the structure of a roll of such material can be configured such that the ambient temperature does not have an effect, or at least a very minor one, on the roll diameter. Avoided, in particular, is the so-called “thermal barreling,” i.e., a roll expansion that increases from the ends toward the center. Given thereby is also the option of forgoing a cooling of the roll, which is customary with the prior art.
Depending on their use in the coater as an applicator roll, backing roll, transfer roll or speed sizer roll, the above rolls can be made with different covers or of solid fiber composite plastic. A rubber or polyurethane cover has the additional advantage that the adhesion characteristics of rubber or polyurethane on the fiber composite material are better than those of metal, so that cover separations from the core are more seldom than with the prior art.
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Eickholt Eugene
Taylor & Aust P.C.
Voith Sulzer Papiermaschinen GmbH
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