WO2005059250A1

WO2005059250A1 - Curtain application system

Info

Publication number: WO2005059250A1
Application number: PCT/EP2004/053488
Authority: WO
Inventors: Christoph Henninger; Martin Tietz; Volker Fäthke; Stefan Reich; Uwe Fröhlich
Original assignee: Voith Paper Patent Gmbh
Priority date: 2003-12-17
Filing date: 2004-12-15
Publication date: 2005-06-30
Also published as: DE10359117A1

Abstract

The invention relates to a curtain application system which is used to apply at least two application media. According to curtain application systems known as prior art, all application media are collected in a common tray, such that said application media can be used for an additional coating application. The aim of the invention is to provide a curtain application system wherein the collected application media can be used for another coating application. Based thereon, the curtain application system (10) comprises two portable collection devices (16, 17) which are used to collect the at least two application media (A, B).

Description

Curtain applicator

description

The invention relates to a curtain applicator for one or both sides applying at least two liquid or pasty media on a running surface, wherein the curtain applicator dispenses the at least two application media in the form of substantially gravity-related moving curtains to the moving surface. In the case of direct application, the surface can be the surface of a material web, in particular of paper or cardboard, and, in the case of indirect application, the surface of a transfer element, for example an applicator roll, which delivers the application medium to the surface of the material web.

Such curtain applicators are known from the prior art. Also, commissioned works are already known with which several application media can be applied. In these known curtain coater a common tray for collecting the application media is present.

This drip tray serves to prevent when starting or stopping the curtain applicator or to achieve no-line edges on the running surface, that the spreading media on the current surface to be swept (transfer element in indirect order, or the material web, in particular of paper or cardboard , with direct order) and can pollute the components or the environment. If different application media are used, it comes with arrangement of a common collecting device in her to a mixing of the respective application media. The expensive order media can thus hardly be used for another coating order. Separating each other is extremely difficult, so these mixed media must be disposed of. Apart from the high purchase prices, the disposal costs for these media are also very high. The invention has the object to improve a curtain applicator of the type mentioned in that the application media can be used again in the future after collecting each, and no longer need to be disposed of.

The invention solves this problem by a curtain applicator of the type mentioned, in which according to the invention at least two movable collecting devices are provided for collecting at least two application media. Thus, media of a kind, but with different composition or completely different media types are catchable and reusable. Medium types are, for example, pigment-containing coating color, glue, starch, impregnating agent, etc.

Each of the at least two movable collecting devices can receive one of the at least two application media. As a result, the at least two application media are thus collected separately by the at least two movable collecting devices, and can consequently be recirculated to the commissioned unit and reused for another coating application. So far, the high disposal costs and the acquisition costs for new order media are eliminated or can be minimized.

In one embodiment of the invention, the at least two collecting devices can be moved separately. In this way it is possible to apply selected application media on a running surface and to record the other application media with one of the collecting devices. Separate job media can thus be started and stopped at different times.

In one development of the invention, the curtain applicator can be provided with at least two nozzles for applying the at least two application media, wherein the at least two nozzles in a common housing, spaced to each other, are summarized. The combination of several nozzles in a common housing prevents mixing of the application media immediately after their exit from the respective nozzles. In addition, such a spaced arrangement of the nozzles can prevent mixing of the applied different application media.

In another embodiment, however, it is also possible that a single nozzle is provided with at least one separating element for separating the emerging from the single nozzle at least two application media. By this embodiment, a lesser design effort is possible. In addition, it can be applied in a confined space several media. This construction also allows better adhesion or networking of the applied media with each other.

The separating element for separating the at least two application media in the single nozzle can be realized in a particularly simple and inexpensive manner, if e.g. a thin separating plate, a plastic film o.a. is.

In the case of curtains that are particularly closely spaced from the application media, it is unavoidable that the at least two collecting devices collide with one another. To avoid such a collision, the at least two collecting devices may be mounted at different heights.

Moving devices, such as piston-cylinder arrangements and / or linear guides and / or spindle drives and the like, have proven to be particularly expedient for the separate movement of the at least two collecting devices.

So that the liquid curtains formed by the application media can not get onto the running surface when the reception devices are placed under the curtains, the at least two reception devices can be at least as wide as the formed by the emerging from the at least two nozzles curtains.

In order to be able to absorb the application media optimally, the at least two collecting devices can be designed in the shape of troughs and / or channels.

If the at least two collecting devices have at least one inclined side wall, the application media to be collected can be picked up optimally by the at least two collecting devices and without a subset of the spreading media running down the outer edge of the collecting devices.

Hereinafter, embodiments of the present invention will be explained in more detail with reference to the accompanying drawings.

In detail show:

Fig. 1 is a side view of a first embodiment of a curtain applicator according to the invention;

2 shows a side view of a second embodiment of a curtain applicator according to the invention.

Same reference numerals in the two figures, the same components.

Fig. 1 z eigt a curtain applicator 10 for applying liquid curtains 11 and 12 forming different application media A and B, consisting of, for example, coating color, glue or impregnating agent, etc. The curtain applicator 10 has two nozzles 13 and 14, from which the different application media A and B exit to substantially gravity due to a running surface 15, the direct order the Surface of a material web, in particular of paper or cardboard, and for indirect application, the surface of a transfer element, such as an applicator roll, which discharges the application medium to the surface of the material web to be applied.

In the example, a material web 15 is selected from paper, which runs here in the direction of arrow L via guide rollers 30 at a Betriebsgschwindigkeit in a machine for their production and / or finishing and is coated in a direct process. The operating or web speed is about 2000m / min.

In the direction L before the commissioned work 10 a so-called Aircut 40 is placed in Figurl and therefore drawn in for the sake of completeness. With this device, or Aircut 40 is an undesirable air boundary layer, which is registered with the high-speed material web 15 with and would affect the media curtains negative, removed by stripping and / or suction and / or by the action of electrostatic forces.

Above the material web 15, trough-shaped collecting devices 16 and 17 are arranged in order to prevent the application media from reaching the material web 15 when starting or stopping the curtain application unit 10. Due to the separate trays 16 and 17, the curtains 11 and 12 generating media A and B can be collected separately in order to use them later for another coating order again. Each of the trays 16 and 17 is provided with a separate moving means 18 and 19 (piston-cylinder units are shown in the example) for driving them individually and for moving them as indicated by a double-headed arrow. Thus, it is possible to move the tray 16, for example, under the curtain 1, whereby, for example, a coating application with medium B is prevented on the material web 15 from the nozzle 13, while a coating order from the nozzle 14 with medium A is still possible because the The trough 17 associated with the nozzle 14 can then not be placed under the curtain 12. The nozzles 13 and 14 are combined in a common housing 100. The summary of the nozzles 13 and 14 in a common housing 100 prevents mixing of the curtains 11 and 12 immediately after their exit from the nozzles 13 and 14. Due to the relatively large distance of the nozzles 13 and 14 to each other also a mixing of the material web 15 applied application media A and B can be prevented, wherein first the medium A is applied, and optionally can dry before the next medium B or possibly other media are applied.

2 shows a curtain application unit 20, in which the application media A and B form liquid curtains 22 and 23 after they exit a nozzle 21. The curtains 22 and 23 can be captured by trough-shaped receiving means 24 and 25, whereby the troughs 24 and 25 can be moved away by means of the movement means 18 and 19 under the curtains 22 and 23 or by them as the drawn double-headed arrow.

The nozzle 21 is provided with a separating element 26, for example a thin sheet or a film made of plastic, in order to separate the media A and B forming the curtains 22 and 23 within the nozzle and as they emerge from the nozzle 21. Consequently, mixing of the two coating media A and B in the nozzle 21 and its exit from the nozzle 21 can be avoided by the separating element 26.

Since the two application media can be applied to the material web 15 with the nozzle 21 in the smallest possible space, better adhesion of the applied application media to one another is possible with the nozzle 21. Since multiple application media can be applied simultaneously with the nozzle 21, this design is less expensive than those designs that require multiple nozzles.

When curtain applicator 20, the trays 24 and 25 are mounted at different heights to the application media A and B despite the small distance of Curtains 22 and 23 to safely receive each other, and to exclude a collision of the trays 24 and 25.

The movement means 18 and 19 for moving the troughs 16, 17, 24 and 25 are as illustrated in Figure 1, designed as a piston-cylinder assemblies. The trays 16, 17, 24 and 25 are at least as wide as the male curtains 11, 12, 22 and 23. Thus, the application media can not reach the web 15 when the trays 16, 17, 24 and 25 under the curtains eleventh , 12, 22 and 23 are placed.

The troughs 16, 17, 24 and 25 have at least one sloping sidewall to improve the shrinkage and collection of the medium, but also to prevent a subset of the application media from running down the outer edge of the troughs 16, 17, 24 and 25 and leads to contamination.

REFERENCE NUMBERS

A job medium

B application medium

L running direction

10 curtain applicator

20 curtain applicator

11 curtain

12 curtain

13 nozzle

14 nozzle

15 running surface

16 catcher

17 collecting device

18 movement device

19 movement device

21 nozzle

22 curtain

23 curtain

24 catcher

25 collecting device

26 separating element

30 guide rollers

100 housings

Claims

claims

1. curtain applicator (10, 20) for applying one or both sides of at least two liquid or pasty media on a running surface (15), wherein the curtain applicator (10, 20) the at least two application media (A, B) in the form of itself in a direct application, the surface of a material web, in particular of paper or cardboard, and in the case of indirect application, the surface of a transfer element, for example a Application roller is, which emits the application medium (A, B) to the surface of the material web, characterized in that at least two movable collecting devices (16, 17, 24, 25) for collecting the at least two application media (A, B) are provided.

2. curtain applicator (10, 20) according to claim 1, characterized in that the at least two collecting devices (16, 17, 24, 25) are movable separately.

3. curtain applicator (10) according to claim 1 or 2, characterized in that it comprises at least two nozzles (13, 14) for applying the at least two application media (A, B), and the at least two nozzles (13, 14) in one common housing (100) are summarized.

4. curtain applicator (20) according to claim 1 or 2, characterized in that there is a single nozzle (21) with at least one separating element (26) for separating the at least two from the single nozzle (21) exiting Application media (A, B) has.

5. curtain applicator (20) according to claim 4, characterized in that the separating element (26) a thin separating plate, a plastic film o.a. is.

6. curtain applicator (20) according to one or more of claims 1 to 5, characterized in that the at least two collecting means (24, 25), which are each assigned to one of the at least two application media, are mounted at different heights.

7. curtain applicator (10, 20) according to one or more of claims 1 to 6, characterized in that there are moving means (18, 19), for example piston-cylinder assemblies and / or linear guides and / or spindle drives and the like for the separate drive of at least two collecting devices (16, 17, 24, 25).

8. curtain applicator (10, 20) according to one or more of claims 1 to 7, characterized in that the at least two collecting means (16, 17, 24, 25) are at least as wide as that of the from the at least two nozzles ( 13, 14, 21) emergent application media formed curtains (11, 12, 22, 23).

9. curtain applicator (10, 20) according to one or more of claims 1 to 8, characterized in that the at least two collecting devices (16, 17, 24, 25) are formed trough and / or channel-shaped.

10. curtain applicator (10, 20) according to claim 9, characterized in that the at least two collecting means (16, 17, 24, 25) have at least one oblique side wall.

1. curtain applicator (10, 20) according to one or more of claims 1 to 10, characterized in that the at least two collecting means (16, 17, 24, 25) at the beginning and / or end of the operation of the same and / or on Seitenrändem can be used above the running surface (15).