DE10001393A1 - Web surface coating applicator has a function unit mounted to the carrier structure together with the doctor function unit as a SDTA assembly which is easily cleaned and serviced - Google Patents

Abstract

The applicator (10a) for coating the surface of a moving fiber web with a liquid or paste coating medium (28) has a distribution channel (26a) and the flow openings (34) into the equalizing channel (32a) are at the function unit (12a), which is in a swing mounting at or anchored to the carrier structure (14). The distribution channel (26a) has a longitudinal and pref. rectangular cross section. A run-off gutter (56) is under the function unit (12a). A swing drive, with a motor-driven spindle lift, swings the function unit (12a) in relation to the carrier structure (14), and at least one limit stop restricts the swing movement. A further function unit (18a) is mounted to the carrier structure (14) or a fitting (20) at it, as a doctor (42a) to give a dosing and/or equalizing action on the applied coating layer (54) of the coating medium (28) on the web surface (U). The doctor unit (18a), function unit (12a) and the applicator chamber (44a) together form a short dwell time applicator (SDTA). Or the function units (12a,18a) together with an applicator jet form a free stream jet applicator. The function unit (12a) is exchangeable with one cover which forms the limit wall section (31) to define the equalizing chamber (32a), fitted to the carrier structure (14). The replacement function unit has a number of separate applicator jets from the distribution channel, across (Q) the web width, to deliver the coating medium (28) to the running web surface (U). The same structure can be used for an indirect coating action on the web surface (U).

Description

The invention relates to a device for applying a liquid or pasty application medium on a running surface, the When applying directly, the surface of a material web, in particular from paper or cardboard, and in the case of an indirect order Surface of a transfer element, preferably a transfer roller, which is the application medium then to the surface of the material web transmits, wherein the application device a distribution channel for feeding of order medium includes, as well as a compensation chamber, which with the distribution channel over a plurality of in the transverse direction of the substrate distributed transfer openings is connected, and wherein a first boundary wall of the compensation chamber on a parent th supporting structure or a part attached to it, while a second boundary wall of the compensation chamber on one Functional unit is formed, which on the parent support construction or a part pivotally attached to it is.

Such application devices with pivoting functional units are for example from DE 44 32 177 A1 and EP 0 846 804 A1 known which disclose both free jet nozzle applicators. With these two application devices, the distribution channel is in the parent supporting structure or the part attached to it educated. Accordingly, the functional unit is only used for limitation the compensation chamber and for the arrangement or training of one of the Nozzle lips of the discharge nozzles of these free jet nozzle applicators. For Maintenance and cleaning of the known application devices first the superordinate supporting structure of a counter roller  pivoted, the surface of which either forms the running surface or supports the material web. Then the functional unit of the superordinate supporting structure or the part attached to it pivoted to allow an inspection of the compensation chamber. Since the person performing the maintenance or cleaning is usually on the side of the supporting structure facing away from the functional unit in particular for the visual inspection of the transfer openings unfavorable conditions between the distribution channel and the compensation chamber.

For further prior art, reference is made to DE 44 14 949 A1 a application device with a short exposure time (SDTA - short dwell time applicator), for their maintenance or cleaning the above Said also applies.

In contrast, it is an object of the present invention to place an order provide device that is easier to maintain or clean.

This object is achieved by an application device solved type mentioned, in which the distribution channel and the Transfer openings are provided on the functional unit. Through this Surprisingly simple measure is achieved that the transition Equalization chamber boundary surface of the radio with openings tion unit, and in particular the transfer openings themselves, after the Swiveling the functional unit from the support structure to the view of the Operator or maintenance person is fully exposed. Thus the Direction of passage of the transfer openings essentially in the direction of view the maintenance person so that they can easily check whether one or more of the transfer openings is blocked. This was with the Prior art applicators discussed above not because of a glancing glance at the transfer openings possible.  

If the distribution channel is an elongated, preferably substantially has rectangular, cross-sectional area, so the application device due to this space-saving construction of the distribution channel during operation closer to the counter surface (e.g. surface of the counter roller) be pivoted up without the return of over application medium becomes too narrow. This offers greater freedom when choosing the operating angle of the order according to the invention contraption.

As is known per se from the prior art, can be below the Functional unit can be arranged a gutter in which the Excess application medium running underground collected and from there is returned to an application medium reservoir. This gutter has the further advantage in the arrangement according to the invention that it any leakage flows from the distribution channel and the compensation chamber can collect and therefore the entire system from pollution as a result protects such leakage currents.

To increase the operational reliability of the order according to the invention device is further proposed that the functional unit on the parent supporting structure or the part attached to it can be anchored.

Basically, it is possible for the maintenance person to use the functional unit for maintenance or cleaning by hand from the parent support construction swings. The inspection of the order according to the invention However, the device can be further simplified in that a Swivel drive device is provided for pivoting the Functional unit relative to the superordinate supporting structure. The Swivel drive device can preferably at one of the lateral ends attack the applicator, d. H. on the drive side or / and the Driver's side of the application device. As a swivel drive device  For example, a motor-driven screw jack comes in Consideration. To protect the counter roller, at least one can also End stop to limit the pivoting movement of the functional unit be provided.

In addition to the functional unit mentioned above, in Further development of the invention on the parent support structure or arranged on this attached part another functional unit his.

This further functional unit can be a doctor blade device, for example for dosing and / or leveling the applied on the surface Include layer of application medium, such as a doctor blade or a Doctor blade with smooth or profiled surface. It can also be provided be that the other functional unit together with the one functional unit the order chamber of a commissioned work with a short exposure time forms or that the further functional unit together with the one Functional unit forms the delivery nozzle of a free jet nozzle applicator. Finally, it is also possible that the one functional unit against one Functional unit is interchangeable, which is only a cover of the Compensation chamber delimiting wall parts of the parent support construction or the part attached to it or which one Distribution channel for supplying order medium and a plurality of in The individual nozzles are distributed across the substrate Delivery of the order medium to the underground includes.

According to the discussion above, it is another great advantage of the device according to the invention that it is simple in a quick manner can be converted, not only to different types of Application devices can be converted, but also to a simple squeegee device. For this conversion point of view, therefore independent protection sought.  

According to a further aspect, the present invention therefore further relates to a device for applying a liquid or pasty application medium to a running substrate or for metering and / or leveling a layer of application medium applied to a running substrate, the substrate being the surface of a material web when applied directly , in particular of paper or cardboard, and in the case of indirect application, the surface of a transfer element, preferably a transfer roller, which then transfers the application medium to the surface of the material web, the device being pivotally articulated to a superordinate supporting structure or to a part fastened to it Functional unit, which is designed according to one of the following alternatives:

• a) the functional unit comprises a distribution channel for feeding Order medium and limited together with the parent Supporting structure or the part attached to this a compensation chamber, which with the distribution channel over a plurality of in Transverse direction of the subsoil arranged arranged crossing Connections is connected, the functional unit further together with another functional unit, which at the parent supporting structure or the part attached to it is arranged, the order chamber of a commissioned work with short Exposure time forms;
• b) the functional unit comprises a distribution channel for supplying Order medium and limited together with the parent Supporting structure or the part attached to this a compensation chamber, which with the distribution channel over a plurality of in Transverse direction of the subsoil arranged arranged crossing Connections is connected, the functional unit further together with another functional unit, which is connected to the over orderly supporting structure or the part attached to it  is arranged, the discharge nozzle of a free jet nozzle applicator forms;
• c) the functional unit comprises a distribution channel for supplying Application medium and a plurality of in the transverse direction of the sub basically arranged individual nozzles for placing the order mediums to the underground;
• d) the functional unit merely forms a cover for the Execution according to alternatives a) or / and b) the compensation chamber-delimiting wall parts of the parent support construction or the part attached to it, wherein in addition, a further functional unit is provided, which on the superordinate supporting structure or the one attached to it Part is arranged and a doctor device for metering or / and Equalize the layer applied to a running surface of application medium.

The invention is explained below using exemplary embodiments with reference to the attached drawings are explained in more detail. It shows:

Figure 1 is a schematic side sectional view of a first embodiment of an application device according to the invention in the operating state.

FIG. 2 shows the application device shown in FIG. 1 in the maintenance position; and

Fig. 3-5 are views similar to Fig. 1 of other devices for applying the coating medium to a moving substrate or for metering and / or leveling a layer applied to the substrate layer of application medium.

In Fig. 1, an application device according to the invention is generally designated 10a. It is used to apply a layer 54 of application medium 28 to a substrate U moving in the direction of the arrow L, for example a material web, in particular made of paper or cardboard.

The application device 10 a is in the illustrated embodiment, as a coating apparatus with a short reaction time (SDTA - short dwell time applicator) is formed. It comprises a first functional unit 12 a, which is pivotably articulated on a supporting beam 14 by means of a hinge 16 , and a second functional unit 18 a, which is arranged on a part 20 connected to the supporting beam 14 .

The first functional unit 12 a comprises a base plate 22 a, by means of which it is articulated on the support beam 14 via the hinge 16 . On the supporting beam 14 side facing away from the base plate 22 a, a manifold is connected to the base plate 22 a 24 a, wherein the distributor pipe 24 a and the base plate 22 a a define together a distribution channel 26 by which the application medium 28 Q in the transverse direction of the substrate U is supplied. The surface 30 a of the base plate 22 a facing the support beam 14 and part 31 of the surface of the support beam 14 jointly delimit an equalizing chamber 32 a which is arranged with the distribution channel 26 a over a plurality of transfer openings 34 a distributed in the transverse direction Q of the substrate U in Connection is established. The compensation chamber 32 a is sealed down in the embodiment according to FIG. 1 by a sealing attachment 38 a equipped with a sealing element 36 a. Corresponding (not shown) sealing arrangements are provided on the side edges of the compensation chamber 32 a arranged in front of or behind the plane of the drawing in the view according to FIG. 1.

At the upper end of the base plate 22 a in FIG. 1, an attachment element 40 a is fastened, which together with a doctor device 42 a limits the application chamber 44 a of the SDTA application device 10 a. The doctor device 42 a, which is part of the second functional unit 18 a, in the illustrated embodiment comprises a doctor rod 46 a with a smooth or profiled surface, which is taken up in a doctor bed 48 a. The doctor bed 48 a is fastened to the part 20 connected to the supporting beam 14 by means of a blade element 50 a and a roughly schematically arranged adjusting device 52 as a double arrow. Furthermore, a further adjusting device 58 is provided between the part 20 arranged on the support beam 14 and the doctor device 42 a, by means of which the layer thickness of the application layer 54 can be influenced, preferably both in the longitudinal direction (longitudinal profiling) and in the transverse direction (transverse profiling).

In the application chamber 44 a, the application medium 28 is brought into connection with the substrate U moving in the direction of the arrow L, ie in the case of direct application with the surface of a material web, in particular made of paper or cardboard, or in the case of indirect application with the surface of a transfer element , in particular a transfer roller, which then transfers the layer 54 of application medium 28 applied to it in the running direction L downstream of the application device 10 a onto the material web.

Furthermore, a collecting trough 56 is provided, which is fastened to the supporting beam 14 and is used to catch excess application medium 28 ′ scraped off the substrate U by means of the doctor device 42 a and into an application medium supply (not shown) for renewed supply through the distribution channel 26 a attributed.

In order to be able to keep the dimensions of the compensation chamber 32 a as constant as possible in the order mode, individual spacers 60 a are provided on the base plate 22 a, which are additionally positively anchored via an anchoring device 62 a, for example screw bolts, on the support beam 14 by a to be able to reliably prevent unintentional lifting of the spacers 60 a or pivoting of the base plate 22 a or the entire first functional unit 12 a from the supporting beam 14 .

It should be added that in order to effect the pivoting movement of the first functional unit 12 a 64 is provided relative to the support beam 14 a only roughly indicated schematically in Fig. 2 adjusting device, and an end stop 66 of the unit, the pivoting movement of the first function 12 a limited.

The application device 10 a described above is advantageous in several respects:

If, for example, to carry out cleaning or maintenance work, the supporting beam 14 is pivoted away from the subsurface U, and after the anchoring device 62 a is released, the first functional unit 12 a is pivoted away from the supporting beam 14 , as is shown in FIG. 2, dash-dotted arrow B) the operator or maintenance person not only the compensation space boundary surface 30 a of the base plate 22 a of the first functional unit 12 a, but above all the passage 34 a between the distribution channel 26 a and the compensation space 32 a presented in a way , which makes it possible in a simple manner to visually inspect the passage passages 34 a as to whether one or more of them are blocked. This considerably simplifies the cleaning and maintenance of the application device 10 a.

As a further advantage, it should be mentioned that any leakage application medium emerging from the distribution channel 26 a or the compensation space 32 a, such as the scraped-off excess application medium 28 ′, is also collected by the collecting channel 56 . Contamination of the application device 10 a or of the system parts surrounding it is thus reliably prevented in a simple manner.

Finally, another advantage is that the device according to the invention can be easily converted into another type of application device or another type of device for treating the substrate U by exchanging the two functional units 12 a and 18 a, such as this will be explained in more detail below using the example of FIGS. 3 to 5:

FIG. 3 shows a further embodiment of an application device according to the invention, which essentially corresponds to the application device according to FIGS . 1 and 2. Therefore, in FIG. 3, analog parts are provided with the same reference numerals as in FIG. 1, but supplemented by the lower case letter "b" instead of "a". In addition, the embodiment from FIG. 3 will be described in the following only insofar as it differs from the embodiment according to FIGS. 1 and 2, to the description of which reference is otherwise expressly made here.

The application device 10 b as shown in FIG. 3, in contrast to the contract a device 10 according to FIG. Configured as a free-jet nozzle applicator 1 and 2. For this purpose, the attachment element 40 b attached to the base plate 22 b of the first functional unit 12 b is formed as a nozzle lip 70 b at its free end facing the underground U. On the other hand, the second functional unit 18 b comprises a nozzle lip element 72 b, which is fastened to the part 20 connected to the supporting beam 14 via a blade element 50 b and the adjusting device 52 . The nozzle lips 70 b and 72 b together limit a nozzle channel 74 b, through which the application medium 28 is emitted in the free jet as an application layer 54 to the substrate U.

The conversion from the SDTA application device 10 a according to FIGS . 1 and 2 to the free jet nozzle application device 1 Whether according to FIG. 3 can be done by simply exchanging the SDTA functional units 12 a and 18 a for the free jet functional units 12 b and 18 b. For this, it is necessary, on the one hand, to pivot the first SDTA functional unit 12 a away from the supporting beam 14 and to hang it out of the hinge 16 , instead of hanging the first free-jet functional unit 12 b into the hinge 16 , then pivoting it against the supporting beam and at 62b on it to anchor. On the other hand, only the squeegee device 18 a needs to be removed after loosening the adjusting device 52 from the element 20 fastened to the supporting beam 14 and exchanged for the nozzle lip arrangement 18 b.

It should also be pointed out that the structure of the first SDTA functional unit 12 a and the first free-jet functional unit 12 b differ only with regard to the shape of the elements 40 a and 40 b.

In FIG. 4, a further embodiment is shown of an applicator device according to the invention which substantially corresponds to the application devices described above. Therefore, in FIG. 4, analog parts are provided with the same reference numerals as in FIG. 1, but supplemented by the lower case letter "c" instead of "a". In addition, the embodiment according to FIG. 4 will be described in the following only insofar as it differs from the embodiments explained above, to the description of which reference is otherwise expressly made here.

In the embodiment according to FIG. 4, the application device 10 c is designed as an application device with a long exposure time (LDTA - long dwell time applicator). In this case b, the first function unit 12 includes a single nozzle coater in which the coating medium 28 by a plurality of transversely Q adjacent to one another on the manifold 24 c arranged individual nozzles 80 c as a spray on the substrate U is applied. The second functional unit 18 c arranged downstream of the first functional unit 12 c in the running direction L of the substrate U is again designed as a doctor device 42 c in the exemplary embodiment shown in FIG. 4, which metered and leveled the layer 54 of application medium applied to the substrate U.

In contrast to the exemplary embodiments explained above, the base plate 22 c of the first functional unit 12 c has no openings. However, it is designed as a cover plate for the device 10 a in the SDTA application device 10 a and the free jet nozzle application device 10 b, the compensation chamber 32 a or 32 b on the part of the support beam 14 delimiting surface sections 31 and protects them from contamination by drying application medium 28 .

According to the embodiment shown in FIG. 5, the device 10 d can also serve only for metering and / or leveling a layer 54 of application medium 28 which has been applied to the substrate U in a direction L of the substrate U upstream of the device 10 d is. In this case, the first functional unit 12 d only comprises a cover plate 22 d, while the second functional unit 18 d in turn has a doctor device 42 d.

Claims (14)

1. The device ( 10 a; 10 b) for applying a liquid or pasty application medium ( 28 ) to a running substrate (U), the substrate being applied directly to the surface of a material web, in particular made of paper or cardboard, and being applied indirectly Surface of a transfer element, preferably a transfer roller, which then transfers the application medium to the surface of the material web, the application device comprising:

• - A distribution channel ( 26 a) for supplying application medium ( 28 ) and
• - An equalizing chamber ( 32 a; 32 b), which is connected to the distribution channel ( 26 a) via a plurality of transfer openings ( 34 a) arranged in the transverse direction (Q) of the substrate (U),

wherein a first boundary wall ( 31 ) of the compensation chamber ( 32 a; 32 b) is formed on a superordinate supporting structure ( 14 ) or a part fastened to it, while a second boundary wall ( 30 a) of the compensation chamber ( 32 a) is formed on a radio function unit ( 12 a; 12 b) is formed, which is articulated on the superordinate supporting structure ( 14 ) or a part fastened to it, characterized in that the distribution channel ( 26 a) and the passage openings ( 34 a) on the functional unit ( 12 a; 12 b) are provided. 2. Application device according to claim 1, characterized in that the distribution channel ( 26 a) has an elongated, preferably substantially rectangular, cross-sectional area. 3. Application device according to claim 1 or 2, characterized in that a drainage channel ( 56 ) is arranged below the functional unit ( 12 a; 12 b). 4. Applicator according to one of claims 1 to 3, characterized in that the functional unit ( 12 a; 12 b) can be anchored to the superordinate supporting structure ( 14 ) or the part fastened to it. 5. Applicator according to one of claims 1 to 4, characterized in that a pivot drive device ( 64 ) is provided for pivoting the functional unit relative to the superordinate supporting structure. 6. Applicator according to claim 5, characterized in that the swivel drive device ( 64 ) comprises a motor-driven screw jack. 7. Applicator according to one of claims 1 to 6, characterized in that at least one end stop ( 66 ) is provided to limit the pivoting movement of the functional unit ( 12 a; 12 b). 8. Applicator according to one of claims 1 to 7, characterized in that a further functional unit ( 18 a; 18 b) is arranged on the superordinate supporting structure or the part ( 20 ) fastened thereon. 9. Application device according to claim 8, characterized in that the further functional unit ( 18 a) comprises a doctor device ( 42 a) for metering and / or leveling the layer ( 54 ) of application medium ( 28 ) applied to the substrate (U). 10. Application device according to claim 8 or 9, characterized in that the further functional unit ( 18 a) together with the one functional unit ( 12 a) forms the application chamber ( 44 a) of an application unit with a short exposure time. 11. Applicator according to claim 8, characterized in that the further functional unit ( 18 b) together with the one functional unit ( 12 b) forms the dispensing nozzle ( 74 b) of a free jet nozzle applicator. 12. Applicator according to one of claims 1 to 11, characterized in that the one functional unit is interchangeable with a functional unit ( 12 d), which only covers the compensation chamber ( 32 a) delimiting wall parts ( 31 ) of the superordinate supporting structure ( 14 ) or the part attached to it. 13. Application device according to one of claims 1 to 12, characterized in that the one functional unit is interchangeable with a functional unit ( 12 c) which has a distribution channel ( 26 c) for supplying the application medium ( 28 ) and a plurality of in the transverse direction (Q ) of the substrate (U) distributed individual nozzles ( 80 c) for delivering the application medium ( 28 ) to the substrate (U). 14. Device ( 10 a- 10 d) for applying a liquid or pasty application medium ( 28 ) to a running substrate (U) or for metering and / or leveling a layer ( 54 ) of application medium applied to a running substrate (U) ( 28 ),
the substrate being the surface of a material web, in particular of paper or cardboard, with direct application and the surface of a transfer element, preferably a transfer roller, which is then transferring the application medium to the surface of the material web,
wherein the device ( 10 a- 10 d) comprises a functional unit ( 12 a- 12 d) articulated on a superordinate supporting structure ( 14 ) or a part fastened to it, characterized in that the functional unit is designed according to one of the following alternatives :

• a) the functional unit ( 12 a) comprises a distribution channel ( 26 a) for supplying application medium ( 28 ) and, together with the superordinate supporting structure ( 14 ) or the part fastened to it, limits an equalizing chamber ( 32 a), which with the distribution channel ( 26 a) is connected via a plurality of transfer openings ( 34 a) which are distributed in the transverse direction (Q) of the substrate (U),

wherein the functional unit ( 12 a) together with a further functional unit ( 18 a), which is arranged on the superordinate supporting structure or the part ( 20 ) attached to it, forms the application chamber ( 44 a) of an order work with a short exposure time;

• a) the functional unit ( 12 b) comprises a distribution channel for supplying application medium ( 28 ) and, together with the superordinate supporting structure ( 14 ) or the part fastened to it, delimits a compensation chamber ( 32 b) which communicates with the distribution channel over a plurality of in Transverse direction (Q) of the subsurface (U) is arranged in connection with the distribution openings,

wherein the functional unit ( 12 b) together with a further functional unit ( 18 b), which is arranged on the superordinate supporting structure or the part ( 20 ) attached to it, forms the dispensing nozzle ( 74 b) of a free jet nozzle applicator;

• a) the functional unit ( 12 c) comprises a distribution channel ( 26 c) for supplying application medium ( 28 ) and a plurality of individual nozzles ( 80 c) distributed in the transverse direction (Q) of the substrate (U) for dispensing the application medium ( 28 ) to the underground (U);
• b) the functional unit ( 12 d) only forms a cover ( 22 d) which, when executed according to alternatives a) and / and
• c) the compensation chamber ( 32 a; 32 b) delimiting wall parts ( 31 ) of the superordinate supporting structure ( 14 ) or the part attached to it

whereby in addition a further functional unit ( 18 d) is provided, which is arranged on the superordinate supporting structure or the part ( 20 ) attached to it and a doctor device ( 42 d) for metering and / or leveling the on a running surface (U ) applied layer ( 54 ) of application medium ( 28 ).