Device for dosed application of flowable media on a web or cylin

Coating apparatus – Solid applicator contacting work – Movably mounted applicator

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Details

118212, B05C 108

Patent

active

048482692

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS

This application is a national phase application of PCT/AT No. 86 00052 filed Aug. 28, 1986 and based, in turn, upon an Austrian application No. A 2546/85 filed Aug. 30, 1985 under the International Convention.
The invention relates to a device for the dosed application of flowable media to a web or a cylinder by means of a dip- and transfer roller and an applicator roller.


BACKGROUND OF THE INVENTION

In the application of flowable media on a substrate, particularly when very small amounts of the flowable medium are to be uniformly applied, it is known to use a roller partially dipping into a trough containing the medium, so that the turning roller entrains the medium in its motion. In order to control the thickness of the layer adhering to the surface, it is known to provide stripping wipers. It is also known to first transfer the medium to be applied by means of a dosage roller to an applicator roller, which then transfers the medium to the substrate to be treated. Furthermore, it is known to use roller wipers and other application devices magnetically pressed against the substrate, during printing as well as during coating.
Particularly when small amounts of medium are applied, the interplay between the roller dipped into the medium or receiving the medium and the applicator roller, as well as the proper magnetic pressure towards the web of material, becomes very important.


SUMMARY OF THE INVENTION

In accordance with the invention, that the applicator roller resting against the surface is magnetically pressed against the latter and has an elastic surface and can rest against a transfer roller the medium to it.
The transfer roller taking up the medium to be applied, is then wiped off or rolled against the applicator roller, for dosage or measuring purposes. This insures that per surface unit, the roller takes up constantly the same amount of the medium to be applied, independently of on the consistency of the medium to be applied, i.e. whether this has a high or low viscosity, or the nature of the medium. The recesses in the grid-like patterned transfer roller are always completely filled and thereby a precisely determined amount of the medium to be applied is transferred to the applicator roller, and thus it is possible to transfer to the substrate, e.g. the web of material, a very precisely predetermined amount of medium. In addition to being magnetically pressed, the applicator roller is not mounted on an axle. In this way one of the problems which arise with the heretofore-known rollers is avoided. When rollers of normal operational width, i.e. as rule an operational width between 1.5 and 3 m, are axially supported and provided with stub axles, one always has to take into account the possibility of a roller deflection. Due to the fact that, in accordance with the invention, the applicator roller can move with respect to the application surface and be magnetically pressed against it, a constant application pressure is insured over the entire length of the roller even to the extent of allowing free deflection at seams.


BRIEF DESCRIPTION OF THE DRAWING

The invention is more fully described with the aid of the examples shown in the accompanying drawing.
In the drawing,
FIG. 1 is a diagrammatic section which shows an embodiment wherein a trough with the medium to be applied is provided laterally with respect to the magnetic roller;
FIG. 2 is a diagrammatic section showing the grid-like patterned roller and the applicator roller arranged one over the other;
FIG. 3 is a similar view which shows an arrangement wherein the grid-like patterned roller closes an open trough; and
FIGS. 4, 5 and 6 are similar views which show further embodiments of the invention.


SPECIFIC DESCRIPTION

In the embodiment according to FIG. 1, the dipper- or transfer roller 1 with a grid-like patterned surface, dips into the medium to be applied which is stored in a container 7. The medium to be applied rests in the surface recesses of the profiled surface of the roller 1 and the exc

REFERENCES:
patent: 4046931 (1977-09-01), Innes et al.
patent: 4378390 (1983-03-01), Yoshida et al.
patent: 4428291 (1984-01-01), Dorow
PCT, WO85/01226, Zimmer, 3/28/85.

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