EP1643034A1 - Coater - Google Patents

Abstract

A roller-coating machine for the application of liquid or paste-like coating material to a running sheet of paper, cardboard or other fibrous material, has splash guards covering the roller pins between the ends of the rollers and the bearing housings. A device (1) for the application of a liquid to pasty coating material (3) to one or both sides of a running sheet of paper, cardboard or other fibrous material (5) during the production or finishing of (5), comprising at least one applicator (4, 4a) and at least one roller (2, 2a) to support the sheet (5) for direct application or for the uptake and transfer of material (3) to (5) for indirect application, each rotating roller (2, 2a) having a roller pin (7, 7a) on the face at the end (6, 6a) which is held in a bearing housing (8, 8a) supported in a load-bearing structure (9) on the device (1). In this system, the part of the roller pin (7, 7a) between the end (6, 6a) of the roller (2, 2a) and the bearing housing (8, 8a) is covered with a splash guard (11, 11a, 11b).

Description

The invention relates to a device for one or two-sided application of liquid to pasty application medium on a running paper, board or other fibrous web in their manufacture or refinement, with at least one application unit and at least one roller to support the fibrous web in direct order or Recording and transmission of the coating medium on the fibrous web in indirect application, wherein the rotating roller has at its two ends each have a roll neck, which is received in each case spaced from the front end of the roller in a bearing housing, which in turn is supported in a support frame of the applicator.

The application of the coating medium on the fibrous web takes place as already stated, either directly, wherein the fibrous web is supported by a so-called counter-roller, or the application is carried out in an indirect manner first to a so-called application roller, which then transfers the application medium to the fibrous web.
Often, a simultaneous indirect application takes place on both sides of the web at the same time, to which both application rollers form a nip with each other, which passes through the fibrous web.

When applying the application medium used (pigment-containing aqueous coating color, glue or starch) and water droplets of existing Randbefeuchtungsdüsen due to the usual today, high web speeds significant Abspritzungen that distribute as medium fog in the environment and are undesirable there.
Especially if these sprays of the application medium are warm to hot and come into contact with ambient air, the particles dry quickly and crust. In the further course of the order process, these can Build up encrustations more and more crumbling and get onto the freshly coated fibrous web, where they negatively affect the order result or even lead to the demolition of the ongoing fibrous web with significant downtime of the machine.

The affected areas must be cleaned consuming and in short cycles.

In the past, therefore, various solutions have been proposed to protect the environment from splashes and soiling. Thus, DE 1 02 5212 A1 describes a shielding arrangement which is arranged around the area of the complete application device.
Reference is also made to the subsequently published DE 10 2004 013780.3, in which a pivotable protective shield between the support body for the application unit and adjacent components of the coating machine is described.

The invention has for its object to provide a device by which the immediate and wider environment of the application unit better than before can be kept free of dirt and can be extended by the cleaning cycles.

The inventors have recognized that the medium mist sprayed off during the application process, which originates, for example, from a medium predosing or from the roll nip or from water droplets from edge moistening nozzles, especially in the lateral direction on the roll neck in the area between the bearing housing and the front end of the roll (per web or web) Machine side or leader and drive side)) and thereby lead to poor running properties of the roller. You have also recognized that these precipitating particles are thrown off the rotating roll neck due to the strong centrifugal forces undefined, whereby a significant impairment of especially the bearing housing and the adjacent support or squeegee beams of the applicator occurs.

According to the invention, the object is therefore achieved in that the area of the roll neck between the end face of the roll and the bearing housing is covered with a splash guard.
As a result, the location which propagates the sprays is advantageously encapsulated. The closer environment, such as the sensitive bearing housing and the wider environment, such as operating walkways and web guide elements can thus be protected from contamination. Therefore, the cleaning cycles can be shortened considerably. This is all the more advantageous, especially since the cleaning is associated with a standstill of the device, which leads to production failure, which you want to avoid, of course.

Said roll neck may be part of a so-called counter roll. About such a backing roll, which can also be referred to as a backup roll, the fibrous web runs while it is provided with the application medium.
The roll neck can also be part of a so-called applicator roll, on the peripheral surface of the application medium is first applied and then discharged to the fibrous web. In the case of single-sided application, only one such application roller is set in the operating position, while with simultaneous two-sided application, two application rollers form a nip with one another, in which the application medium is transferred to the fibrous web.

In an embodiment of the invention, it can be provided that each journal of a roller, that is to say on the driver and drive side of the applicator, is provided with its own, ie separate, splash guard. As a result, individual encapsulations are possible.

Alternatively, it is also possible that the splash guard is formed so that it spans at the same time a plurality of roll necks, at least of two together forming a nip (press nip) rollers per roll end side or device side. In this case, such an "extended" spray protection device in the machine longitudinal direction can be arranged in each case on the driver's side and on the driving side.

This "extended" design is easier, because only one attachment point for several pins is necessary.

It is particularly expedient if the splash guard is designed as a turn-on and swing-hood. It can be easily cleaned even during the job and also does not need to be removed during cleaning. But it is also possible to attach the hood on the bearing housing or on the support frame of the applicator detachably and, for example, to screw.

For pivoting the splash guard, it is expedient to use hydraulically or pneumatically or electrically operable actuating means. Alternatively, it is also possible, of course, by means of handles attached to the guard, the protective device by hand on and off.

The splash guard can be U-shaped, preferably formed with circular arc shape, as a hood. This form has advantages over, for example, also possible angled designs because no corners and edges are present, in which the Abspritzungen could accumulate.

In a further embodiment of the invention it can be provided that the splash guard with a hydrophobic, i. Water-repellent and / or dirt-repellent coating material is provided, which can be applied both on the inside (here preferred), as well as on the outside or on both sides.

As a coating material or solid material for the splash guard is particularly suitable polytetrafluoroethylene (PTFE or Teflon) or the like, because this material has excellent non-stick properties and the abspritzende by the applicator and on the splash guard precipitate medium can thereby easily bead.

In this sense, may also be thought of a special surface design for the purpose of achieving the bead effect, especially on the medium intercepting inside of the protective device.

A further advantageous embodiment of the invention is that the splash guard is double-walled. On the one hand it thereby gains more stability, on the other hand it can be filled for example with a coolant, for example water, for a better bead-off effect or else a heating medium, such as hot water or superheated steam, if the medium is to adhere specifically there.

It is very advantageous if, on the surface of the splash guard, in particular on its side facing the roll neck, i.e. on the inside thereof, steam or water jets are directed for moistening or vapor deposition. Thus, the adhesive, absorbed Abspritzungen or dirt can be eliminated easily.

It is also advantageous if the splash guard has an inwardly facing gutter, from which the collected contaminants together with cleaning liquid can be deducted.

In order to make the splash guard as effective as possible, it is provided to arrange the splash guard in only a minimal distance, which is approximately up to 100 mm, preferably 1 to 10 mm, to the end face of the roller.

The distance of the splash guard to the face of the respective roller can be minimized if either a sliding seal or a labyrinth seal is attached.

The device according to the invention is characterized by a simple structure, wherein the splash guard can also be retrofitted in existing applicator.

However, installation of such a splash guard is not only limited to application devices, but is also conceivable, for example in press rolls or smoothing rollers and thus everywhere applicable where Abspritzungen - even of drops of water - are feared in the vicinity of rotating rollers and should be avoided.

Reference to an embodiment, the invention will be explained in more detail.

Figur 1:

eine Seitenansicht einer Auftragsvorrichtung mit den Auswirkungen gemäß dem Stand der Technik

Figur 2:

eine Draufsicht auf Figur 1

Figur 3:

eine erfindungsgemäße Vorrichtung mit Spritzschutzeinrichtung für je eine Walze in der Seitenansicht

Figur 4:

eine Draufsicht auf Figur 3

Figur 5:

ein Ausführungsvariante zur Figur 3 mit Spritzschutzeinrichtung für zwei Walzen gleichzeitig in der Seitenansicht

Figur 6:

eine Draufsicht auf Figur 5

Figur 7:

eine Seitenansicht der Spritzschutzeinreichtung gemäß Figur 3

Figur 8:

eine weitere Variante zu Figur 7

Figur 9:

die Spritzschutzeinrichtung in perspektivischer Darstellung

Figur 10:

eine weitere Ausführungsvariante einer Spritzschutzeinrichtung gemäß Figur 9 in der Seitenansicht

Figur 11:

eine Draufsicht auf die Anordnung der Spritzschutzeinrichtung an der betreffenden Walze

Figur 12:

eine Draufsicht auf eine weitere Ausführungsform der Anordnung der Spritzschutzeinrichtung an der betreffenden Walze

Figur 13:

eine Draufsicht auf eine weitere Ausführungsform der Anordnung der Spritzschutzeinrichtung an der betreffenden Walze

The figures show a schematic representation:

FIG. 1:

a side view of an applicator with the effects of the prior art

FIG. 2:

a plan view of Figure 1

FIG. 3:

an inventive device with splash guard for one roller in the side view

FIG. 4:

a top view of Figure 3

FIG. 5:

a variant of Figure 3 with splash guard for two rolls simultaneously in the side view

FIG. 6:

a plan view of Figure 5

FIG. 7:

a side view of Spritzschutzeinreichtung according to Figure 3

FIG. 8:

a further variant of Figure 7

FIG. 9:

the splash guard in perspective view

FIG. 10:

a further embodiment of a splash guard according to Figure 9 in side view

FIG. 11:

a plan view of the arrangement of the splash guard on the respective roller

FIG. 12:

a plan view of another embodiment of the arrangement of the splash guard on the respective roller

FIG. 13:

a plan view of another embodiment of the arrangement of the splash guard on the respective roller

FIG. 1 shows an applicator device 1, a so-called film press, comprising two rolls 2 and 2a forming a nip N with one another for indirect application of a liquid to pasty application medium 3 on both sides (or 3a on roll 2a), for example a coating color. The application medium 3, 3a is applied in an indirect manner, selected in the example, by means of a respective application unit 4 or 4a. This is done first on the peripheral surface of the rollers 2 and 2a. In the nip N, which passes through a fibrous web 5 from top to bottom in the direction of arrow L in the example, the transfer of the medium 3, 3a takes place at the same time on both sides of the fibrous web 5.
The rollers 2 and 2a, which rotate in the direction of the arrow, each have at their two ends 6 and 6a (that is the end of the shell of the applicator roll 2 and 2a) a roll pin 7 or 7a. This roll neck 7 and 7a is received at a distance a to the end face 6 and 6a in a bearing housing 8 and 8a, which in turn is supported in a support frame (chairing) 9 of the applicator device 1.
In Figure 1 and Figure 2 (Figure 2 is a plan view of the device shown in Figure 1 with only one end face of the roller 2 and 2a shown) those areas are indicated in the escape dirt particles and pollution of the environment, such as in the transverse direction the operating device 1 extending operating webs 10, but in particular the area around the roll pins 7 and 7a lead. The in The dot-shaped clouded area shown in FIGS. 1 and 2 is intended to represent the extent of the medium mist M _N leading to contamination of the environment in the prior art. This medium mist results at high running speeds of the rollers and the fibrous web from spitting order medium particles and also from water droplets of existing edge nozzles, which serve to moisten the roll edge.
These contaminations caused by spraying require increased cleaning effort and possibly shorter cleaning cycles.

Since it now wants to avoid such Abspritzungen and the high cleaning costs, the area of the roll neck 7 and 7a between the end-side roll end 6 and 6a and the spaced bearing housing 8 and 8a covered with a splash guard 11, as the invention in the following figures shows. In the variant shown in FIGS. 3 and 4 (top view of FIG. 3), one splash guard 11 and 11a is arranged one for each roller 2 and 2a. The splash guards 11 and 11a have a simple-to-produce and clean hood shape with circular arc-shaped surface. The splash guards 11 and 11a are attached to the housing of the rollers or on the support frame 9 for the applicator 1 and also designed swiveling. With 11 'and 11a' and dash-dotted lines the pivoted protective devices 11 and 11a are shown.

Another embodiment of the splash guard according to FIG. 5 and the associated plan view. FIG. 6. The splash guard is indicated here with 11 b and at the same time spans both lying on a common device side areas of the roll neck 7 and 7 a. This embodiment is easier to produce, but a little less variable. However, the splash guard 11 b also turn on and swung designed, as indicated in dash-dotted lines and designated 11 b '. Because the splash guard 11 b is formed extended relative to the variant 11 and 11 a of Figure 3 and 4, a circular arc-shaped hood would be the height too much enlarge. Therefore, a slightly angled box-like design is chosen in this variant.

FIG. 7 shows an arcuate splash protection device 11 or 11a, as it is also shown in FIG. In this figure 7 is to be shown that the inside 12 of the same device is provided with a non-stick coating 13. In contrast, FIG. 8 shows a coating on both sides, that is also on the outside 14.

FIG. 9 shows a double-walled splash guard 11, 11a. Of course, the splash guard 11 b could be double-walled. The existing cavity or interior space 15 can thereby be filled with a temperature control agent 16, such as a coolant, for example water, or else with a heating medium, such as superheated steam or hot water. A coolant is used if you want to achieve beading due to condensation. Heating means, on the other hand, are used when the caking of the collected contaminants (medium mist particles M _N ) is favored in order to then be able to remove them selectively from the respective inside and / or outside.

FIG. 10 shows that the inside 12 of the splash guard 11, 11a (which is also possible in the case of the splash guard 11b) can be humidified or steamed from the outside via supply lines and spray nozzles 17 in order to achieve the effects described above. The splash guard 11, 11 a, 11 b therefore does not need to be double-walled here

Also shown is an inwardly facing gutter 18 for catching the beaded or rinsed soils from where they can be peeled off to the outside.

It is understood that, as already partially explained, the embodiments according to FIGS. 7 to 10 also apply to that embodiment of the splash guard 11 b, but should not be shown separately.

FIG. 11 is intended to indicate that the splash guard 11, 11a or 11b is arranged at a minimum distance a from the end face 6 or 6a of the roller 2 or 2a. The distance a is approximately up to 100 mm, preferably 1 to 10 mm, whereby an effective encapsulation of the area around the roll pins 7 and 7a is achieved.

Figures 12 and 13 show that the distance a of the splash guard 11, 11a or 11b said end face 6 or 6a by attaching a sliding seal 19, for example, with attachment of rubber strips (see Figure 12) or a labyrinth seal 20 (see 13) and the encapsulation effect is thereby improved or the area to be encapsulated is almost ideally sealed.

LIST OF REFERENCE NUMBERS

1

applicator

2, 2a

roller

3, 3a

application medium

4, 4a

application unit

5

Fibrous web

6, 6a

front end of the roller

7, 7a

roll neck

8, 8a

bearing housing

9

supporting frame

10

operating catwalks

11, 11a, 11b

Splash guard

11 ', 11 a', 11 b '

Splash guard swung off

12

Inside of the splash guard

13

Non-stick coating

14

Outside of the splash guard

15

Interior or cavity of the splash guard

16

temperature control

17

jet

18

gutter

19

poetry

20

labyrinth seal

a

distance

L

Arrow or direction

M _N

medium mist

Claims (13)

Device (1) for application of liquid or pasty application medium (3) on one or both sides of a moving paper, board or other fibrous web (5) during its production or refinement, with at least one application unit (4, 4a) and at least one Roller (2, 2a) for supporting the fibrous web (5) during direct application or for receiving and transferring the application medium onto the fibrous web (5) in the case of indirect application, the rotating roller (2, 2a) being provided at its two end faces (6, 6a) each having a roll neck (7, 7a), which in each case spaced from the front end (6, 6a) of the roller (2, 2a) in a bearing housing (8, 8a) is received, which in turn in a support frame (9) of Applicator device (1) is supported,
characterized in that the region of the roll neck (7, 7a) between the frontal end (6, 6a) of the roller (2, 2a) and the bearing housing (8, 8a) with a splash guard (11, 11a, 11b) is covered. Device according to claim 1,
characterized in that each roll neck (7, 7a) is provided with a separate splash guard (11, 11a,). Device according to claim 1,
characterized in that the splash guard (11b) is adapted to extend over a plurality of, at least two, one nip (N) forming roll necks (7, 7a) located on the same apparatus side. Apparatus according to claim 1 to 3,
characterized in that the splash guard (11, 11a, 11b) as on and swing-away, or with the bearing housing (8, 8a) releasably connected hood is formed. Device according to claim 4,
characterized in that for pivoting the splash guard (11, 11 a, 11 b) are provided hydraulically or pneumatically or electrically operable actuating means or handles are mounted, for pivoting by hand. Device according to claims 1 to 5,
characterized in that the splash guard (11, 11a, 11b) is provided with a hydrophobic, ie water-repellent and / or dirt-repellent coating material which both on the inside (12), as well as on the outside (14) or on both sides (12, 14) can be applied. Device according to claim 6,
characterized in that as a coating material or as a material for the splash guard (11, 11 a, 11 b) polytetrafluoroethylene (PTFE) or the like are provided. Device according to one or more of claims 1 to 7,
characterized in that the splash guard (11, 11a, 11b) during operation of the application unit (4, 4a) is replaceable and / or cleanable. Device according to one or more of claims 1 to 8,
characterized in that the splash guard (11, 11a, 11b) is double-walled, with the resulting interior space (15) can be acted upon with a coolant, for example water. Device according to one or more of claims 1 to 9,
characterized in that at least the inner side (12) of the splash guard (11, 11a, 11b) by means of supply lines with connected nozzles (17) is humidified or steamed. Device according to one or more of claims 1 to 10,
characterized in that the splash guard (11, 11a, 11b) has an inwardly facing gutter (18). Device according to one or more of claims 1 to 11,
characterized in that the splash guard (11, 11a, 11b) at a minimum distance (a), which is approximately up to 100 mm, preferably 1 to 10 mm, to the end face (6, 6a) of the roller (2,2a) is arranged , Device according to one or more of claims 1 to 11,
characterized in that the distance (a) of the splash guard (11, 11a, 11b) to the end face (6, 6a) of the roller (2, 2a) can be minimized by attaching a sliding seal (19) or a labyrinth seal (20) ,

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