EP2103358A1 - Doctoring device - Google Patents

Abstract

The invention relates to a squeegee device comprising - A head part (4), which forms a doctor bed (7) for a in a groove (9) received cylindrical metering rod (8) as dosing and / or leveling element and - A foot part (5), which carries the head part (4) or the doctor bed (7), wherein the foot part (5) in a support beam (10) by means of a foot part (5) associated with the clamping hose (6) is held and the head part (4) including doctor blade (8) with a pressing element (12) against the substrate to be coated (2) can be pressed. According to a first solution according to the invention it is provided that the clamping hose (6) is an integral part of the foot part (5). According to a second solution according to the invention, it is provided that the pressing element (12) is a non-integral part of the head part (4) and is received in an external pressing device (15) and from the outside to the rear side (20) of the groove opposite the groove (9) Head part (4) and the doctor bed (7) acts. According to a third solution according to the invention, it is provided that at least one sealing tube (27, 30, 32, 34) is provided for the head part (4) or the doctor bed (7).

Description

• ein Kopfteil, welches ein Rakelbett bildet für einen in einer Nut aufgenommenen zylindrischen Rakelstab als Dosier- und /oder Egalisierelement und
• ein Fußteil, welches das Kopfteil bzw. das Rakelbett trägt, wobei das Fußteil in einem Rakelbalken mittels eines diesem Fußteil zugeordneten Klemmschlauchs gehalten ist und wobei das Kopfteil einschließlich Rakelstab mit einem Anpresselement gegen den zu beschichtenden Untergrund andrückbar ist.

The invention relates to a squeegee device, which is intended for metering and / or leveling a coating medium, such as coating color on a substrate, the substrate for direct application, the surface of a running paper, cardboard or other fibrous web and indirect application, the surface of a Transfer element is that dispenses the application medium to the fibrous web, comprising a doctor unit comprising:

• a head part, which forms a doctor bed for a received in a groove cylindrical metering rod as dosing and / or leveling element and
• a foot part which carries the head part or the doctor bed, wherein the foot part is held in a doctor bar by means of a clamping tube associated with this foot part and wherein the head part including doctor blade with a pressing element against the substrate to be coated is pressed.

A squeegee device contains wearing parts, which often have to be replaced. In addition, the device is susceptible to contamination and requires frequent cleaning. Also for this purpose, individual components must be removed and replaced if necessary.

A generic doctor device is from the DE-A1 10 2004 029 565 known. In this device, the clamping tube and also the pressure hose is received in a retaining strip. The retaining strip is connected to the head part, ie the doctor bed. In a preferred embodiment (see there FIG. 2 ), the retaining strip at the same time forms the foot part of the exchangeable doctor unit, which is held in a holder or in Rakeltragbalken.
Although this device is constructed in the form of a modular system and therefore easy to handle and variable, the accessibility to the doctor unit is still not optimal.

It is therefore an object of the invention, starting from the cited prior art, to provide an improved doctor blade device, which is cheaper, in which the Exchanging his doctor unit or individual, wear-prone components can be done easier and faster and / or their cleaning effort is reduced.

The object is achieved according to a first solution with the features of claim 1. According to the invention, the clamping hose is received directly in the foot part. That is, it is an integral part of the foot part of the doctor unit. This embodiment has the advantage that the doctor unit - ie head part or doctor bed together with the doctor bar, retaining strip or foot part together with clamping hose - can be removed from the doctor blade holder or the supporting doctor bar. The cleaning of the seat of the doctor unit can thereby go much faster.

It is very advantageous if there is a planar contact surface in the doctor blade holder or in the doctor support beam, to which the doctor unit or its foot part is pressed during clamping. After a replacement of the doctor unit is thus a reproducible position available. This greatly facilitates the positioning. In addition, the time required for cleaning and replacement is thereby shorter than before.

The fact that the clamping hose is always arranged on the side of the doctor unit which faces away from the medium (this is the same side on which the rear side of the head part or of the doctor bed is located and which faces away from the doctor bar pressed against the running substrate) he protected against contamination by the application medium when doctoring or leveling.

The object of the invention is also achieved according to a second solution with the features of claim 2. According to the invention, it is provided here that the contact pressure element is a non-integral part of the head part and is accommodated in an external pressure device and acts from the outside on the rear side of the head part or the doctor bed lying opposite the groove. The advantage of this design is that the pressing element can remain in the device and not every time the doctor unit is removed with must be changed.
The replacement takes place faster than before, which is why the downtime for the coating machines is lower than before and thus the productivity is increased.

The object of the invention is also achieved according to a third solution with the features of claim 3. According to the invention, it is provided here that at least one sealing tube is provided for the head part or the doctor bed. When using a single sealing tube above or below the doctor rod receiving groove and also when using a second sealing tube (below and above the doctor rod receiving groove) can be acted upon by the sealing tube sealing lip so press against the metering rod, that the metering rod is performed better for a better and on the other hand, the seat of the metering rod is less susceptible to contamination.
When relieving the pressure or the hoses, the doctor bar can much faster and easier to remove from the doctor bed as without the presence of the or the sealing hoses. This helps to reduce service and maintenance times and, consequently, reduce coater downtime, which in turn increases productivity.

The features according to the invention described above can each be applied individually or in combination with one another.
The described individual devices or a possible combined device are inexpensive, easily accessible and cleanable.

Further expedient variants emerge from the subclaims.

The invention also relates to a coating machine for the application of a liquid to pasty application medium, for example coating color to a running substrate, wherein the substrate is the surface of a running paper, board or other fibrous web and the surface of a transfer element in the case of indirect application, which dispenses the application medium to the fibrous web. The coating machine according to the invention has a against the Ongoing underground doctor blade device with a replaceable doctor unit for metering and / or leveling of the applied application medium according to one or more of claims 1 to 26.

A per se known coating machine can be easily retrofitted with the inventive devices or a combined device.

• Figuren 1 bis 6 : verschiedene Ausführungsvarianten der erfindungsgemäßen, im Querschnitt schematisch dargestellten Rakelvorrichtung

The invention will be explained in more detail by means of exemplary embodiments. In a schematic representation:

• FIGS. 1 to 6 : Various variants of the invention, in cross-section schematically illustrated doctor device

In the figures, the same components are provided with the same reference numerals.

In the figures, a modular composite doctor blade device is shown in each case, which is arranged downstream of a coating machine not shown with applicator and the metering and / or leveling of a coating medium 1, for example, coating paint on a running surface 2 is used. This ongoing background 2 is for clarity only in the FIG. 1 marked with. Underground 2 should be in the examples given a running, to be refined paper or board web.
The doctor device comprises a replaceable doctor unit 3, which consists of a head part 4, a foot part 5 and a clamping tube 6. At the same time, the head part 4 serves as a doctor bed 7 for a rotatable circular-cylindrical doctor rod 8 as a doctor element (ie metering or leveling element) for the application medium 1. The doctor bed 7 has a receptacle or a groove 9 for the doctor bar 8 rotatable therein. The doctor bed 7 also has two sealing lips 7.1 and 7.2, which seal the doctor blade against contamination.
The foot part 5 carries the head part 4 and the doctor bed 7 and is also held in a support beam 10. This is done with the integrated in the foot part 5 terminal tube 6. The foot part 5 has for this purpose a specially molded bracket 11th on, in which the clamping tube 6 is inserted.
The head part 4 and the metering rod 8 are for the purpose of metering or leveling of the applied application medium 1 with a pressing element 12 against the substrate to be coated 2 pressed. Abgerakeltes medium flows along a front side 13 in a likewise only in this FIG. 1 illustrated gutter 14th

How out FIG. 1 can be seen, the doctor device for the contact pressure 12 has a pressing device 15. This is an external assembly and consists of a holding body 16, a pressure bar 17 with bracket 18, which receives the contact pressure element 12, in particular a pressure hose 12.1 and an adjusting device 19 has. The pressing element 12, ie the Anpressschlauch 12.1 shown here is thus a non-integral part of the head part 4 and acts from the outside on the groove 9 opposite the back 20 of the head part 4 and the doctor bed 7 a.

The support beam 10, also referred to as a doctor blade holder or doctor bar, is otherwise designed to be swingable away from the substrate 2 to be coated for the purpose of replacing the doctor unit 3.

The FIG. 1 also shows that the foot part 5 is positioned on a contact surface 21 of the doctor beam 10. As a result, a reproducible position of the entire doctor unit 3 is created.

Moreover, a flexible section 22 is present between the head part 4 and the foot part 5. In the FIG. 1 For this purpose, a bending point 22.1 has been selected. However, the flexible portion 22 could also have an unillustrated pivot for the purpose of tilting or pivoting movement. The bending point 22.1 shown here can be designed, for example, as a notch or as a constriction or in the form of a leaf spring. In the example shown the FIG. 1 In any case, for the sake of simplicity, the flexible section 22 is indicated only by a dashed circle.

In FIG. 1 It can be seen that the head part 4 and the foot part 5 are separate components.

This embodiment offers the possibility to manufacture the head part 4 or doctor bed 7 and the foot part 5 from different hard and / or different thermal materials. But this also offers the possibility that they are decoupled from each other in terms of their thermal expansion.

In FIG. 2 is a variation of FIG. 1 to see. The doctor unit 3 has in this variant instead of the foot part 5 FIG. 1 a continuous, one-piece retaining strip 23, which in addition to the holder 11 for the clamping hose has an additional holder 24 for the head part 4 and the doctor bed 7. This retaining strip 23 also has a flexible section 22 or a bending point 22. Retaining strip 23 and the head part 4 are separate components, with the properties for the separate foot part 5 and the head part 4 in FIG. 1 have been described.

In FIG. 3 is another variation to that in FIG. 1 shown device shown. Here foot part 5 and the head part 4 are positively connected with each other. For this purpose, the head part 4 or doctor blade bed 7 has at least one groove 25 into which the foot part 5 engages with at least one bead 26. As pressing element 12 is here no pressure hose 12.1 act, but find another conceivable type of contact force use. This external contact force is designated 12.2. FIG. 3 also shows that the doctor bed 7 has a sealing tube 27. This sealing tube 27 is received in a recess 28 of the doctor bed 7 and can press the lower sealing lip 7.2 on the metering rod 8 and thus prevent contamination of the receiving groove 9, but at least minimize.

In FIG. 4 a further embodiment of the doctor unit is shown. In contrast to FIG. 3 is here a further recess 29 (possibly in addition to the recess 28 with sealing tube 27) or only this one recess 29 for a sealing tube 30 alone, above the metering rod 8. This can achieve a seal by means of the upper sealing lip 7.1 and thus also or additionally prevent soiling of the receiving groove 9, but at least minimize.

FIG. 4 shows, in contrast to the previous figures that headboard 4 and footboard 5 are integrally formed with each other. The foot part 5 likewise has again a flexible section 22 or a bending point 22.1. However, the foot part is wider than the separate foot part FIG. 1 or FIG. 3 so that there is no need for an extra holder 11 for receiving the clamping tube 6, but the clamping tube 6 is received here in a simple manner in a recess 31 directly in the foot part 4.

The FIG. 5 is essentially the same as in FIG. 1 shown variant. Only here is still a sealing tube 32 is present, which is arranged above the contact pressure element 12 and the pressure hose 12.1 at the opposite of the doctor rod receiving groove 9 back 20 of the head part 4 and the doctor bed 7. The sealing tube 32 is arranged in the same external pressure device 15 as the pressure hose 12.1, but was inserted into a further holder 33.

The FIG. 6 shows a further variant, which is essentially the in FIG. 4 shown variant with one-piece design of the foot part and the head part, widened foot part 5, bending point 22 and integrated recess 31 for the clamping tube 6 corresponds. In contrast to FIG. 4 Here, in addition to the upper sealing tube 30 located in the recess 29, a further sealing tube in the form of a sealing tube 34 arranged on the rear side 20 is arranged here. Thus, two sealing hoses act on the upper sealing lip 7.1.
In contrast to FIG. 4 is here below the sealing tube 34 a pressure hose 12.3 available. Both hoses, ie hose 34 and hose 12.3 are here not included in an external pressure device 15 in contrast to all other versions, but store directly in the head part 4 and in the doctor bed 7 in recesses 35 and 36. When removing the doctor unit are here simultaneously removed all existing pressure hoses from the device with, which means a huge saving of time.

It should be added that in all the variants shown the head part 4 or doctor bed 7 may consist of materials such as thermoplastics, polymers, rubber or material mixtures of the aforementioned types of materials.

The foot part 5 is made of materials such as thermoplastics, polymers, thermosets, e.g. GRP, CFRP, made of steel or light metal, such as aluminum.

The pressure hose 12.1 and 12.3, the clamping tube 6 and the sealing tubes 27, 30, 32 and 34 are each formed as a round tube or profile hose, for example as a commercial nose tube and can from the materials such as rubber, rubber-reinforced fabric, fabric-containing PVC, silicone, natural rubber or Fluoroelastomer be prepared.

In principle, it is possible that the head part 4 or the doctor bed 7 and the foot part 5 is made of the same material. If desired, it is also possible to produce the head part 4 or the doctor bed 7 and the foot part 5 from differently hard and / or different thermal materials.

Both parts, so head and foot can each consist of several items that are integrally connected. The multiple items may consist of different or different materials.

All FIGS. 1 to 6 show, moreover, that the head part 4 or doctor bed 7 polygonal and the foot part 5 is formed like a blade. The foot part 5 is in any case suitable to carry different prefabricated sizes and shapes of the head part 4 and the doctor bed 7, for example, depending on the size of the selected metering rod 8.
In particular, diameters between 5 and 100 mm, preferably 8 to 40 mm, as well as smooth or grooved doctor bars are suitable as doctor bar sizes.

With regard to a selectable spring travel in a flexurally elastic portion, or a pivoting or tilting area (when using a joint) and / or the load capacity and / or the service life of differently shaped foot parts 5, can these are already prefabricated. If required, these components can be provided quickly and easily.

The particular advantage of the invention is that a squeegee device of a plurality of different formable, prefabricatable and storable head parts 4 or squeegee 7, 5 foot sections, retaining strips 23, Anpress- and clamping hoses, sealing tubes 27, 30, 32, 34 and doctor bars. 8 on the one hand modular buildable and easily accessible. On the other hand, wear parts of the squeegee device or of the squeegee unit 3 can be exchanged, repaired and / or cleaned without a prolonged loss of production.

The invention is not limited only to the exemplary embodiments shown.

LIST OF REFERENCE NUMBERS

1

Application medium 1

2

running underground

3

squeegee unit

4

headboard

5

footboard

6

clamping hose

7

doctor bed

7.1

sealing lip

7.2

sealing lip

8th

doctor bar

9

groove

10

Carrier or squeegee bars

11

bracket

12

presser

12.1

pressure tube

12.2

external contact force

12.3

pressure tube

13

front

14

collecting cracks

15

pressing device

16

holding body

17

pressure strip

18

bracket

19

adjustment

20

back

21

contact surface

22

flexible section

22.1

Biegstelle

23

retaining strip

24

bracket

25

groove

26

bead

27

sealing hose

28

recess

29

recess

30

sealing hose

31

recess

32

sealing hose

33

bracket

34

sealing hose

35

recess

36

recess

Claims (27)

Squeegee device, which is intended for metering and / or leveling of a coating medium, such as coating color, on a substrate (2), wherein the substrate (2) for direct application, the surface of a running paper, cardboard or other fibrous web and indirect order the Surface of a transfer element which emits the application medium (1) to the fibrous web, comprising a doctor unit (3) - A head part (4), which forms a doctor bed (7) for a in a groove (9) received cylindrical metering rod (8) as dosing and / or leveling element and - A foot part (5), which carries the head part (4) or the doctor bed (7), wherein the foot part (5) in a support beam (10) by means of a foot part (5) associated with the clamping hose (6) is held and the head part (4) including the doctor bar (8) can be pressed against the substrate (2) to be coated by a contact pressure element (12), characterized in that
the clamping tube (6) is an integral part of the foot part (5). Squeegee device, which is intended for metering and / or leveling of a coating medium, such as coating color, on a substrate (2), wherein the substrate (2) for direct application, the surface of a running paper, cardboard or other fibrous web and indirect order the Surface of a transfer element which emits the application medium (1) to the fibrous web, comprising a doctor unit (3) - A head part (4), which forms a doctor bed (7) for a in a groove (9) received cylindrical metering rod (8) as dosing and / or leveling element and - A foot part (5), which carries the head part (4) or the doctor bed (7), wherein the foot part (5) in a support beam (10) by means of a foot part (5) associated with the clamping hose (6) is held and the head part (4) including the doctor bar (8) can be pressed against the substrate (2) to be coated by a contact pressure element (12), characterized in that
the pressing element (12) is a non-integral part of the head part (4) and is received in an external pressing device (15) and externally on the rear side (20) of the head part (4) or of the doctor bed (FIG. 7). Squeegee device, which is intended for metering and / or leveling of a coating medium, such as coating color, on a substrate (2), wherein the substrate (2) for direct application, the surface of a running paper, cardboard or other fibrous web and indirect order the Surface of a transfer element which emits the application medium (1) to the fibrous web, comprising a doctor unit (3) - A head part (4), which forms a doctor bed (7) for a in a groove (9) received cylindrical metering rod (8) as dosing and / or leveling element and - A foot part (5), which carries the head part (4) or the doctor bed (7), wherein the foot part (5) in a support beam (10) by means of a foot part (5) associated with the clamping hose (6) is held and the head part (4) including the doctor bar (8) can be pressed against the substrate (2) to be coated by a contact pressure element (12), characterized in that
at least one sealing tube (27, 30, 32, 34) for the head part (4) or the doctor blade bed (7) is provided. Doctor device according to at least one of claims 1 to 3,
characterized in that
the pressing element (12) is preferably a pressure hose (12.1, 12.3). Doctor device according to claim 3 or 4,
characterized in that
the sealing tube (27, 30) is received in a recess (28, 29) of the doctor bed (7). Doctor device according to one of claims 3 to 5,
characterized in that
the sealing tube (30, 32, 34) is arranged above the pressing element (12) on the rear side (20) of the head part (4) or of the doctor bed (7) opposite the groove (9). Doctor device according to at least one of claims 3 to 6,
characterized in that
the sealing tube (32) is accommodated in an external pressure device (15), in which the pressure hose (12.1) is also accommodated. Doctor device according to at least one of the preceding claims,
characterized in that
the foot part (5) is positioned on a contact surface (21) of the support beam (10). Doctor device according to at least one of the preceding claims,
characterized in that
the head part (4) and the foot part (5) are separate components. Doctor device according to at least one of claims 1 to 8, characterized in that
the head part (4) and the foot part (5) are formed integrally with each other. Doctor device according to at least one of the preceding claims,
characterized in that
the head part (4) or doctor blade bed (7) polygonal and the foot part (5) are formed like a blade. Doctor device according to claim 9 and 11,
characterized in that
the head part (4) or doctor bed (7) and the foot part (5) are decoupled from one another with respect to their thermal expansion. Doctor device according to claim 9 and 11 or 12,
characterized in that
the head part (4) or doctor bed (7) and the foot part (5) are positively connected with each other. Doctor device according to claim 13,
characterized in that
the head part (4) or doctor bed (7) has at least one groove (25) into which the foot part (5) engages with at least one bead (26). Doctor device according to at least one of the preceding claims,
characterized in that
the head part (4) or doctor blade bed (7) can be produced from materials such as thermoplastics, polymers, rubber or material mixtures of the stated types of materials. Doctor device according to at least one of the preceding claims,
characterized in that
the foot part (5) of materials such as thermoplastics, polymers, thermosets, eg GRP, CFRP, steel or light metal, such as aluminum can be produced. Doctor device according to at least one of the preceding claims,
characterized in that
that of the pressure hose (12.1, 12.2, 12.3) and the clamping hose (6) as well the at least one sealing tube (27, 30, 32, 34) can be formed in each case as a round tube or profile tube, for example as a commercially available nose tube, and can be produced from materials such as rubber, rubber-reinforced material, fabric-containing PVC, silicone, natural rubber or fluoroelastomer. Doctor device according to at least one of the preceding claims,
characterized in that
the head part (4) or doctor bed (7) and the foot part (4) can be produced from the same material. Doctor device according to at least one of claims 1 to 17,
characterized in that
the head part (4) or doctor blade bed (7) and the foot part (4) are made of different hard and / or different thermal materials. Doctor device according to at least one of the preceding claims,
characterized in that
the foot part (5) is adapted to carry different prefabricated sizes and shapes of the head part (4) or doctor bed (7), for example, depending on the size of the selected metering rod (8). Doctor device according to at least one of the preceding claims,
characterized in that
between the head part (4) or doctor bed (7) and the foot part (5) has a flexible portion (22) is present. Doctor device according to claim 21,
characterized in that
the foot part (5) has a bending point (22.1) as a flexible portion (22). Doctor device according to claim 22,
characterized in that
the bending point (22.1) is designed, for example, as a notch, or as a constriction or in the form of a leaf spring. Doctor device according to at least one of the preceding claims,
characterized in that
in terms of a selectable spring travel and / or the carrying capacity and / or the life differently shaped foot parts (5) are vorfertig- and be prepared. Doctor device according to at least one of the preceding claims,
characterized in that
at least one of a plurality of differently formed, prefabricated and stored head parts (4) or doctor beds (7), foot parts (5), retaining strips (23), pressure and clamping hoses (12, 12.1, 12.2, 12.3), sealing hoses (27 , 30, 32, 34) and doctor bars (8) can be built like a box. Doctor device according to claim 24,
characterized in that
the metering rod (8) in the diameters 5 to 100mm, preferably 8 to 40mm with smooth or grooved surface is available. Coating machine for applying a liquid to pasty application medium, for example coating paint on a running substrate (2), wherein the substrate is the surface of a running paper, cardboard or other fibrous web and direct application of the surface of a transfer element, which is the Application medium to the fibrous web,
characterized in that
it has a doctor device, which is employed against the running substrate (2) and has an exchangeable doctor unit (3) for metering and / or leveling the applied application medium (1) according to one or more of claims 1 to 26.

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