DE8633956U1 - Roller dampening system - Google Patents

Description

7858 Weil am Rhein

The invention relates to a roller moistening system according to the preamble of the main claim.

Such roller moistening systems are known in a variety of designs (e.g. DE-AS 28 12 881) and have proven themselves.

However, with these known humidification systems, the water cannot penetrate sufficiently quickly and reliably evenly as would be desirable.

The invention is therefore based on the object of further developing a roller moistening system of this type in such a way that uniform and sufficient moistening is possible.

This task is solved in a generic roller humidifier according to the generic term of the main claim in a surprisingly simple manner by its characteristic features.

As a result of the charge applied by means of the charging electrode, a strong electrostatic force is exerted on the grounded roller or roller of a different polarity, whereby the material web is pressed firmly onto the surface of the roller, which promotes the transfer of water from the roller to the material web. If, in addition, the charging electrode is arranged in front of the wrap angle area, the wrap angle in the inlet area of the roller increases, which increases the overall residence time of the material web on the roller, so that a longer time remains for the water to pass. In addition, as a result of the

Dipl.-Ing. Olio Flügel, Oipl.-Ing. Munfred Siiger, l'ulcntunwiilic, Cosimustr. 81, D-8 Munich 81

Eltex GmbH 13.076

7858 Weil am Rhein

Increasing the wrap angle area results in a certain stretching of the material web in this area, which creates a certain suction effect, which further supports the transfer of water into the material web. This applies even more in the area of the material web on the outlet side, where its stretching decreases.

In a further embodiment of the invention, a further high-voltage electrode can be arranged in the discharge-side area of the moistening roller, but with a different polarity, whereby a certain springing occurs in the thickness direction of the material web. This springing also causes a suction effect when leaving the moistening roller, whereby a better transfer of the water into the material web is achieved.

Further expedient embodiments and further developments of the invention are characterized in the subclaims.

An embodiment is explained in more detail below with reference to the drawing, which shows a schematic representation of the invention.

The roller moistening system, designated as 1 in its entirety, has a grounded moistening roller 2 for the material web, designated as 3 in its entirety, which is laid around the moistening roller in the wrap angle area 4. This roller 5, which runs in a water bath 6, touches another roller along a circumferential surface.

On the side of the material web 3 facing away from the moistening roller 2, the material web 3 is

Dipl.-lng. Olio Flügel, Dipl.-lng. Manfred Siigur, l'ulenlunwültc, Cosimuslr. 81, D-g Munich 81

Eltex GmbH

7858 »eil am Rhein

13,076

track 3 in front of the wrap angle area 4 a charging electrode 8 (schematically marked with a circle) which is charged with one polarity (+) and which

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ei, stretches. By means of the charging electrode 8, charges are applied to the side of the material web 3 facing away from the moistening roller 2, whereby a more intensive adhesion of the material web 3 to the surface of the moistening roller and thus a better transfer behavior of water to the material tap is achieved. At the same time, in the inlet side area of the material web, the wrap angle area 4 increases slightly, whereby stretching is achieved. This stretching creates a physical suction effect, which also supports the transfer of water.

In the rear half of the wrap angle area 4 with respect to the running direction 7, a high-voltage electrode 9 with opposite polarity (-) can also be arranged on the same side as the charging electrode 8 of the material web 3. This high-voltage electrode causes the material web 3 to spring up in the thickness direction, which also creates a physical suction effect that promotes the absorption and transfer of water. The high-voltage electrode 9 preferably also extends over the entire width of the material web.

Outside the wrap angle range 4, further high-voltage electrodes can be arranged on both sides of the material web 3, each extending over its entire width, in order to support the further penetration of water into the material web by electrostatic means.

Claims (8)

DipL-Ing. Otto Flügel, DipL-Ing. Man&ed SägeJ, Patent Attorneys, Cosimastr. 81, D-8 Munich 81 Eltex-Elektrostatik- Gesellschaft mbH Neudorfer Strasse 5 7858 Weil am Rhein 13 . 076/sä/b/kin HALZENBEFBOCHTWERK 1. Roller moistening system with at least one moistening roller i2) for water, which is wrapped by a material web (3) running in the direction of travel (7) on part of its circumference, the wrap angle area (4), over a certain area (including the contact, i.e. a wrap angle area of zero degrees), wherein the water passes from the moistening roller (2) to the material web (3) in the wrap angle area (4), characterized in that on the side of the material web (3) facing away from the moistening roller (2) with respect to the direction of travel (7) a charging electrode (8) of one polarity is arranged in front of the wrap angle area (4) or in the front third adjoining thereto, and that the moistening roller (2) is grounded or has the other polarity. 2. Roller moistening device according to claim 1, characterized in that a high-voltage electrode (9) of the other polarity is arranged in the rear half of the wrap angle range (4) with respect to the running direction (7) of the material web (3) on the side of the material web (3) facing away from the moistening roller (2). Eltex-Electrostatic- 2 13.076 GmbH 3. Roller moistening device according to claim 2, characterized in that the high-voltage electrode (9) is arranged in the rear third of the wrap angle range (4). 4. Roller moistening device according to one of claims 1 to 3, characterized in that the charging electrode (8) and the high-voltage electrode (9) are electrostatically shielded from one another. 5. Roller moistening device, in particular according to one of claims 1 to 4, characterized in that in the running direction (7) behind and on the same side as the high-voltage electrode (9) but outside the wrapping area (4) at least one further high-voltage electrode (10) with reversed polarity is arranged. 6. Roller moistening device, in particular according to one of claims 1 to 5, characterized in that on the same side as the moistening roller (2) of the material web (3) outside the wrap angle range (4) at least one further electrode (11) with opposite polarity to the further high-voltage electrode (10) is arranged. 7. Roller moistening device according to one of claims 1 to 6, characterized in that the electrodes (8 - 11) extend over the entire width of the material web (3). Eltex-Electrostatic- 2a 13.076 GmbH 8. Roller moistening device according to one of claims 1 to 7, characterized in that the further high-voltage electrode (10) and/or the further electrode (11) are designed as surface electrodes with an extension in the running direction (7).