EP1896191B1 - Dosing and/or levelling device - Google Patents

Abstract

A device for metering and/or leveling a liquid to pasty medium applied to a moving surface, the surface in the case of direct application of the medium being a paper, board or other fibrous web and in the case of indirect application being the surface of a transfer element, for example an applicator roll, which transfers the application medium to the surface of the fibrous web, including a retaining body for holding a doctor element and a pressure element, the retaining body being set against the moving surface and the pressure element pressing the top part of the doctor element against the moving surface for the purpose of metering and/or leveling the applied medium; a clamping hose to which pressure can be applied and which therefore executes a displacement travel and which, when pressurized, presses the bottom part of the doctor element against a supporting bar of the retaining body and clamps said doctor element in and, when the pressure is relieved, releases the doctor element; and an additional retaining bar to hold the clamping hose, is arranged parallel to the supporting bar and is accommodated detachably in the retaining body, and the retaining bar having at least one projection toward the supporting bar, which projection projects in a distance beyond the minimum displacement travel of the clamping hose, so that a gap remains with respect to the supporting bar.

Description

The invention relates to a device for metering and / or leveling a liquid applied to a running surface medium to medium, wherein the surface for direct application of the medium, a paper, cardboard or other fibrous web and indirect application, the surface of a transfer element, for example a Application roller is which transfers the application medium to the surface of the fibrous web.

The device comprises a holding body for receiving a doctor element and a pressure element, wherein the holding body is employed against the running surface and the pressure element presses the doctor element at its head against the running surface for the purpose of metering and / or leveling of the applied medium.

The device further comprises a compressible and thus a hub exporting clamping hose, which presses the squeegee element at its foot against a support strip of the holding body while pressurizing and thereby clamps and releases the squeegee element in pressure release.

Such devices are already out of the DE-G 94 16 951 , of the US 5,738,724A as well as the WO 2004/052562 A1 known.

These documents also describe and show that a doctor blade or a doctor blade attached to a blade can form the doctor element and thus, as already explained above, this blade can be clamped into the doctor blade holder with the clamping hose. The clamping tube is inserted in a groove. The groove itself is either incorporated directly into the doctor blade holder or there is a bar, which in turn is firmly connected to the doctor blade holder and in this bar, the groove is recessed.

A disadvantage of these embodiments is that on the one hand, the doctor blade holder thereby has a relatively complicated shape, which is accordingly only consuming to produce and on the other is disadvantageous that the clamping hose must remain in the cleaning of the device in the doctor blade holder. Otherwise, all adjacent device components would have to be removed individually, which means an enormous amount of time and thus downtime or production failure.

In order to ensure a reasonably good accessibility during cleaning or when changing the tube or when inserting the doctor element, in the prior art usually the stroke of the clamping tube is chosen to be large. This means that the groove must be dimensioned correspondingly large, whereby this is better accessible for service and cleaning purposes, but for the doctor blade or the doctor blade is poorly guided when pulling into the device. In other words, the blade is due to the larger space available at its footboard at an angle and can thus damage the terminal tube by cuts or the like with his foot, so that its function is no longer fair.

Moreover, the space available within the device for service and cleaning purposes is still very limited.

Overall, the assembly and disassembly is complicated and expensive and causes high costs.

The invention is therefore based on the object to provide an improved apparatus for metering and / or leveling, with which the disadvantages of the prior art can be avoided.

The object is achieved by the features of the characterizing part of claim 1.

Accordingly, the invention provides that an additional retaining strip for receiving the clamping tube is arranged.

The retaining strip is received in a groove of the holding body and arranged parallel to the support strip.

The retaining strip is attached or detachably arranged in such a way that, together with the clamping tube inserted in it, it can be easily removed from the device, cleaned or exchanged and reinserted. Thus, for example, a hose change much faster and easier than previously possible and only takes about 2min.

An important feature of the invention is that the retaining strip is provided to the support strip or to the clamped doctor element, with projections which protrude beyond the minimum stroke of the inserted in the groove of the retaining strip clamping tube.

This ensures that when retracting the doctor element that does not move significantly or obliquely and can damage the clamping hose.

The term squeegee element in the context of the invention is intended to mean a very thin and sharp-edged doctor blade, but also such a flexible blade element, on which a squeegee rod mounted in a squeegee bed is placed. As a doctor blade but also a metering rod, the doctor bed has a molded baseboard and the foot part is clamped in the blade holder to be understood.

An advantage of the invention is to be considered that the retaining strip including the pressurizable or compressed air compressed hose in a simple manner completely by hand from the holding body laterally or upwardly pulled out or can be inserted. It is understood that when removing or inserting the clamping hose is vented.

The space created with pulled out retaining strip is now larger and more accessible for intended service and cleaning work on the doctor blade holder. In addition, the retaining strip together with the clamping tube in the withdrawn state is more accessible, so that a hose change is much faster abzufatten, because now takes place outside of the doctor device. As a result, production losses during the production and / or refinement of a fibrous web are reduced.

The cleaning effort can be reduced if the retaining strip made of plastic or at least partially coated with a dirt-repellent material, such as Teflon. In addition, a retaining strip made of plastic is lightweight and therefore particularly easy to handle.

An expedient solution may be that the retaining strip is held in the holder body via an inflatable tensioning tube likewise embedded in it.

The connection with the holding body can also be made via a positive connection, for example by hooking, pinching or insertion, beispielseise training according to the principle groove / spring.

The removal from or separation from the holding body (eg doctor bar or supporting beam) is thereby very simple.

The retaining strip can be made of a flexible or a rigid material.

A further advantageous solution is that the clamping hose has only a small stroke or stroke. As a result, the space required is smaller. Also, the hose itself is less unstable with a smaller stroke, but also the doctor element or the blade can be performed better in the holder.

The invention will be explained in more detail with reference to an embodiment.

• Figur 1 : eine im Schnitt in der Seitenansicht dargestellte erfindungsgemäße Vorrichtung zum Dosieren und/oder Egalisieren mit erfindungsgemäßer Halteleiste und eingeklemmtem Rakelelement
• Figur 2 : die Vorrichtung gem. Fig.1 mit druckentlastetem Klemmschlauch
• Figur 3 : die Vorrichtung gem. Figur 1 mit herausgenommener Halteleiste
• Figur 4 : eine erste Variante der Anordnung der Halteleiste
• Figur 5 : eine zweite Variante der Anordnung der Halteleiste

Show it:

• FIG. 1 : A device according to the invention shown in section in section for dosing and / or leveling with inventive retaining strip and clamped squeegee element
• FIG. 2 : the device acc. Fig.1 with pressure-relieved clamping hose
• FIG. 3 : the device acc. FIG. 1 with removed retaining strip
• FIG. 4 : a first variant of the arrangement of the retaining strip
• FIG. 5 : a second variant of the arrangement of the retaining strip

All components of the device 1 shown in section for metering and / or leveling a liquid to pasty medium M applied to a running surface 2 extend over the full width of the device, which in turn corresponds at least to the web width of the fibrous web to be treated.

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

The running surface 2 is the direct application of the medium, such as coating color, glue, starch, a paper, cardboard or other fibrous web and indirect application, the surface of a transfer element, such as an applicator roll, wherein the transfer element the application medium to the surface of the fibrous web transfers.

In the FIG. 1 illustrated device 1 has a holding body 3 (also as Squeegee bar or support body markable). This holding body 3 serves to receive a squeegee element 4 and a pressing element 5, wherein the holding body 3 is employed against the surface 2 running in the running direction L. In the example, the pressure element 5 is a hose acted upon with compressed air, which presses the doctor element 4 against the running surface 2 at its head part 4.1 for the purpose of metering and / or leveling of the previously applied medium M.

Depending on how much of the coating medium M is to be doctored off in g / m ² , or whether only a Vergeichmäßigung the applied medium M should be made, the size of the contact pressure in the direction of arrow F of the doctor element 4 is selected. Serves an adjusting, consisting essentially of adjusting spindle and pressure bar, said adjusting is generally denoted by 6.

As a doctor blade 4 a flexible blade is shown in the example, the blade tip is pressed against the running surface 2. is.

The device 1 further comprises a pressurizable and thus a hub exporting second hose, namely a clamping hose 7, which presses in the inflated state, so under pressure the doctor element 4 at its foot 4.2 against a support bar 8 or stop of the holding body 3. As a result, the doctor element 4 or the blade is clamped. When pressure is released, the doctor element 4 is released and can be removed or replaced.

So that the clamping tube 7 can be replaced better and faster and also cleaned, an additional retaining strip 9 is embedded in the holding body 3. For the retaining strip 9 is inserted into a groove 10 and easily pulled out of this. As in FIG. 2 shown, after pulling out of the retaining strip 9 enough space for cleaning purposes of the doctor blade holder and the groove 10 is available.

The retaining strip itself takes in a trapezoidally shaped groove 11 (instead of previously the holding body 3 and the doctor bar) on the clamping tube 7, as in FIGS. 1 and 3 you can see. The retaining strip 9 is arranged parallel or behind the support strip 8 so that in the inflated state of the located in the retaining strip 9 Clamping hose 7 ( FIG. 1 ) the doctor element 4 is stuck in the holding body.

So that the clamping tube 7 is not damaged when pulling into the device 1 or pulling the doctor element 4 from the device 1 of the blade bottom 4.3, the retaining strip 9, starting from its groove 11 on both sides, the doctor element or blade 4 and the support bar 8 out pointing projections 12. These projections, but at least the lower projection 12 projects beyond the minimum stroke w of the clamping hose 7 by a distance a (about 1.5 mm). This also ensures a small gap s (about 3 mm) to the support strip 8. This ensures that a new blade 4 is better guided when pulling into the device or or a worn or damaged blade 4 when pulling out of the device. It is advantageous that this blade 4 abuts at least on this lower projection 12, instead of as previously contact the terminal tube 7 and damage.

The blade 4 therefore takes in unencumbered clamping hose 7 - that is, when pulling or pulling them out (see FIG. 3 ) a little oblique and almost vertical position, as in FIG. 3 shown with dash-dotted line.

In the examples, in each case a commercially available nose tube consisting of rubber, or rubber-reinforced material, or silicone or natural rubber or the like is shown. But it could also be a commercially available profile hose (such as the Anpressschlauch 5) or a commercially available round hose (as the tension hose 13) are used.

It should be added that the retaining strip 9 with a tension hose 13 (see FIG. 4 ) or by a positive connection 14 (see FIG. 5 ), for example, by Einhängteile, clips, or sliding elements such as a tongue and groove connection and the like. On the holding body 3 can be detachably attached. These connections shown are easily solvable and thus also allow a quick replaceability of the retaining strip 3 with embedded clamping tube. 7

reference numeral

1

contraption

2

running surface

3

holding body

4

doctor member

4.1

headboard

4.2

footboard

5

pressing element

6

adjustment

7

clamping hose

8th

supporting strip

9

retaining strip

10

groove

11

groove

12

head Start

13

clamping hose

14

positive-locking connection

F

contact force

M

application medium

W

stroke

a

distance

s

gap

Claims (6)

1. Device (1) for metering and/or leveling a liquid to pasty medium applied to a moving surface, the surface (2) in the case of direct application of the medium being a paper, board or other fibrous web and in the case of indirect application being the surface of a transfer element, for example an applicator roll, which transfers the application medium to the surface of the fibrous web, comprising:

   a retaining body (3) for holding a doctor element (4) and a pressure element (5), the retaining body (3) being set against the moving surface (2) and the pressure element (5) pressing the top part (4.1) of the doctor element (4) against the moving surface (2) for the purpose of metering and/or leveling the applied medium,

   a clamping hose (7) to which pressure can be applied and which therefore executes a displacement travel (w) and which, when pressurized, presses the bottom part (4.2) of the doctor element (4) against a supporting bar (8) of the retaining body (3) and clamps said doctor element (4) in and, when the pressure is relieved, releases the doctor element (4),

   characterized in that

   an additional retaining bar (9) is provided to hold the clamping hose (7), is arranged parallel to the supporting bar (8) and is accommodated detachably in the retaining body (3), and the retaining bar (9) having at least one projection (12) toward the supporting bar (8), which projection projects in a distance (a) beyond the minimum displacement travel (w) of the clamping hose (7), so that a gap (s) remains with respect to the supporting bar (8).
2. Device according to Claim 1, characterized in that the retaining bar (9) can be withdrawn from and inserted into the retaining body (3) together with the clamping hose (7).
3. Device according to Claim 1 and 2, characterized in that the retaining bar (9) is fabricated from plastic or is at least partly coated with a contamination-repellent material, such as Teflon.
4. Device according to Claims 1 to 3, characterized in that the retaining bar (9) is detachably connected to the retaining body (3) via a tightening hose (13) or by means of a form-fitting connection (14), for example by being hooked in, clamped in, pushed in and the like.
5. Device according to Claims 1 to 4, characterized in that the retaining bar (9) is fabricated from a flexible or rigid material.
6. Device according to Claim 5, characterized in that the clamping hose (7) is a commercially available round, profiled or nose hose consisting of rubber or rubber-reinforced material or silicone or natural rubber or the like and has only a small displacement or displacement travel (w).

Images