EP0791687B1 - Process and device for coating a liquid or pasty material onto a moving web - Google Patents

Description

The invention relates to a method and devices for Apply a liquid or pasty medium, such as Pigmented coating color, starch, Impregnation liquid on a running sheet of paper or cardboard containing waste paper.

A device for applying a liquid or pasty Medium on a running material web according to the state of the Technology that works according to a conventional method known for example from US-A-4,848,268. At this The device form two application rollers rotating in opposite directions a roller gap between them, through which the running Material web is passed through. Every application roller is a Assigned work, which via an order pressure chamber and a doctor element on the liquid or pasty medium Applying surface of the application roller. That on the surface the application roller is then applied by the Rotation of the application roller in the nip between the conveyed into both application rollers. There is the medium from the roller surface to the relevant side of the Transfer material web and at the same time into the material web pressed. This order process is considered indirect Order designated. If both orders are in operation, the running material web will be on both sides in this way coated with the liquid or pasty medium. In a another embodiment of this known device, the also described in US-A-4,848,268 are taking place of the pressure chamber commissioned works commissioned works that form a swamp with a free liquid surface and the medium to be applied from this swamp over one Apply the doctor element to the surface of the application roller.

The one-sided indirect application is also from US-A-4,973,441 known.

With these indirect order processes and associated application devices in and of themselves good good Results achieved, but when pressing the Medium into the material web in the nip from the paper or remove the contamination from the cardboard of the material web and collect on the surface of the application rollers. That can especially when the material web is predominant consists of waste paper. Such on the roller surface accumulated impurities then pollute the Commissioned works and finally strips can appear in the Form application film on the surface of the application roller; the then also on the product, i.e. on the coated Material web, become visible.

The invention is therefore based on the technical problem to create a method and devices with which a high quality liquid or pasty medium on a running web of material can be applied without in or impurities on the material web Order quality can deteriorate.

According to the invention, this technical problem is solved by one Method with the features of claim 1 and Devices with the characteristics of the sibling Claims 6, 7, 10 and 22 solved.

In the method according to the invention, a liquid or pasty medium such as pigmented coating color, starch or impregnating liquid on at least one side of the current Material web containing waste paper applied in a direct order. Then this is on the at least one side of the Liquid or pasty medium applied in material web a separate step into the running material web pressed. The direct application of the medium on the Material web and the pressing of the medium into the Material web thus takes place in separate process steps. Since the press-in step follows the step of applying along the Direction of passage of the material web is connected, can Dirt particles or impurities that accumulate in the If necessary, press the press out of the material web, not get more into the upstream order area, in which the medium is applied to the material web. The Detached particles or impurities can in the Area of the separate press-in step removed easily be so that they no longer point to the Material web arrive and there impairments of Can cause order quality. It also comes with the inventive method during the press-in process much less often to remove Dirt particles from the material web, as these have already been was coated with the liquid or pasty medium. In this way, smaller dirt particles are removed from the applied medium incorporated in a harmless manner, which removes dirt particles during pressing the medium into the running material web be reduced.

In a preferred embodiment of the method for double-sided application of a liquid or pasty medium on a running sheet of waste paper containing material for each side of the Material web of liquid or pasty medium at the same time directly applied to the running material web and that then separate pressing in of the applied medium in the running material web takes place on both sides of the Material web at the same time. This results in a compact, only two-step process for one double-sided application of a liquid or pasty medium on a running material web.

Zunächst wird das flüssige oder pastöse Medium auf die eine Seite der laufenden Materialbahn direkt aufgetragen. In einem nachgeschalteten Schritt erfolgt ein separates Einpressen des zuvor auf die eine Seite der Materialbahn aufgetragenen Mediums in die laufende Materialbahn. Danach wird in einem dritten Verfahrensschritt das flüssige oder pastöse Medium auf die andere Seite der laufenden Materialbahn direkt aufgetragen. In einem nachgeschalteten vierten Verfahrensschritt erfolgt ein separates Einpressen des zuvor auf die andere Seite der Materialbahn aufgetragenen Mediums in die laufende Materialbahn. Bei dieser Ausführungsform erfolgt also der beidseitige Auftrag eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn in vier aufeinanderfolgenden Verfahrensschritten, die entlang der Durchlaufrichtung der Materialbahn durchgeführt werden.

A further preferred embodiment of the method according to the invention for applying a liquid or pasty medium to both sides of a running web of waste paper contains the following method steps:

First, the liquid or pasty medium is applied directly to one side of the running material web. In a subsequent step, the medium previously applied to one side of the material web is pressed separately into the running material web. Then, in a third process step, the liquid or pasty medium is applied directly to the other side of the running material web. In a subsequent fourth process step, the medium previously applied to the other side of the material web is pressed separately into the running material web. In this embodiment, a liquid or pasty medium is applied to both sides of a running web of material in four successive process steps, which are carried out along the direction of travel of the web of material.

Expediently, in the variants described above the direct application of the method according to the invention a desired final order quantity of liquid or pasty medium on any side of the running waste paper Material web in a single order step respectively. In other words, the medium is preferably in in a single operation directly onto the material web plotted that the plotted amount of the desired final order quantity. This results in a compact process.

In another embodiment of the invention, everyone is Step of direct application of the liquid or pasty Medium on any side of the running waste paper web in divided the following substeps:

In a first sub-step, a pre-metering is carried out excess amount of liquid or pasty medium on the relevant side of the material web. In a downstream separate second step, the previous dosing takes place applied to the relevant side of the material web predosed amount of medium to the desired final Order amount.

Instead of a direct, fully dosed in one step Order can therefore be according to the previously explained Embodiment of direct application of the medium if necessary in two substeps, namely a pre-metering step and one Final dosing step, are subdivided. If desired, can the two embodiments with each other can be combined, e.g. such that the direct order of the Medium on one side of the running material web in one single final dosing step takes place during the direct Application of the medium to the other side of the material web in a pre-metering and a final metering step. This can for example, be useful if on the two On the material web side, order media from different consistency should be applied by which the one medium easily in one Finished dosing step can be applied while the other medium better in separate pre-metering and final metering steps can be applied.

• ein Auftragswerk zum direkten Auftragen eines flüssigen oder pastösen Mediums auf eine Seite der laufenden Materialbahn,
• eine rotierende Gegenfläche, auf deren Oberfläche die laufende Materialbahn entlang eines Auflageabschnitts geführt ist, und
• eine gegensinnig zur Gegenfläche rotierende Preßwalze zum Einpressen von auf einer Seite der Materialbahn aufgetragenem flüssigen oder pastösen Medium in die laufende Materialbahn.

A first device according to the invention for applying a liquid or pasty medium, such as pigment-containing coating color, starch, impregnating liquid, to a running web of paper or cardboard containing waste paper

• an application unit for the direct application of a liquid or pasty medium to one side of the running material web,
• a rotating counter surface, on the surface of which the running material web is guided along a support section, and
• a press roller rotating in the opposite direction to the counter surface for pressing liquid or pasty medium applied on one side of the material web into the running material web.

The support section of the material web on the surface of the The counter surface is, based on the direction of flow Material web, first assigned to the order plant and in Distance thereafter the press roll, the press roll with the Counter surface forms a press-in gap through which the Material web, on the support section of the counter surface lying on, is led through.

In other words, the running material web is along a support section on the surface of the counter surface supported and along this support section on the The surface of the material web is initially a commissioned work for direct application of the medium and then a press roller for Press-in of the medium assigned. Applying the medium and the press-in of the medium are spatially different from each other separated and dirt particles that may be in the Release press-in from the running waste paper-containing material web, only reach the surface of the press roll, from where they e.g. deducted using a suitable cleaning device can be. Detached dirt particles can, however not get into the commissioned work and so the quality of the Affect order.

• eine zweite Gegenfläche, die gegensinnig zur ersten Gegenfläche rotiert, und dieser, bezogen auf die Durchlaufrichtung der Materialbahn, im Abstand nachgeschaltet ist, wobei die laufende Materialbahn auf der Oberfläche der zweiten Gegenfläche entlang eines Auflageabschnitts derart geführt ist, daß die bereits mit dem Medium versehene Seite der Materialbahn auf der Oberfläche aufliegt,
• ein zweites Auftragswerk zum direkten Auftragen eines flüssigen oder pastösen Mediums auf eine Seite einer laufenden Materialbahn und
• eine gegensinnig zur zweiten Gegenfläche rotierende zweite Preßwalze zum Einpressen von auf einer Seite der laufenden Materialbahn aufgetragenem flüssigen oder pastösen Medium in die laufende Materialbahn.

A preferred embodiment of the first device according to the invention for applying a liquid or pasty medium on both sides to a running, waste paper-containing material web comprises

• a second counter surface, which rotates in the opposite direction to the first counter surface, and this is connected at a distance downstream from the direction of travel of the material web, the running material web being guided on the surface of the second counter surface along a support section such that the one already provided with the medium Side of the material web lies on the surface,
• a second application for direct application of a liquid or pasty medium on one side of a running material web and
• a second press roller rotating in the opposite direction to the second counter surface for pressing liquid or pasty medium applied on one side of the running material web into the running material web.

The support section of the material web on the surface of the is the second counter surface, based on the Direction of travel of the material web, first the second Assigned work order and then the second one at a distance Press roll, the second press roll with the second Counter surface forms a press-in gap through which the Material web, on the support section of the second counter surface lying on, is led through.

In other words, in this embodiment, the Invention of the first device according to the invention for Coating one side of the running web of material similar device for coating the other side of the downstream material web. So there are two counter surfaces rotating in opposite directions, over which the running material web first with one side and then with the other side. Every counter surface is in Direction of travel of the material web first a commissioned work and then assigned a press roll.

• ein Auftragswerk zum direkten Auftragen eines flüssigen oder pastösen Mediums auf eine Seite der laufenden Materialbahn,
• eine rotierende Gegenfläche, auf deren Oberfläche die laufende Materialbahn entlang eines Auflageabschnittes geführt ist,
• eine gegensinnig zur Gegenfläche rotierende Preßwalze zum Einpressen von auf einer Seite der Materialbahn aufgetragenem flüssigen oder pastösen Medium in die laufende Materialbahn, und
• eine gegensinnig zur Preßwalze rotierende Preßwalzengegenwalze.

A second device according to the invention for applying a liquid or pasty medium to a running, waste paper-containing material web, made of paper or cardboard

• an application unit for the direct application of a liquid or pasty medium to one side of the running material web,
• a rotating counter surface, on the surface of which the running material web is guided along a support section,
• a press roller rotating in the opposite direction to the counter surface for pressing liquid or pasty medium applied on one side of the material web into the running material web, and
• a press roll counter roll rotating in the opposite direction to the press roll.

The commissioned work is the support section of the Material web assigned to the surface of the counter surface and the press roll is the one from the applicator with the medium provided side of the material web, based on the Direction of travel of the material web, at a distance after the Mating surface assigned and forms with the press roll counter roll a press-in gap through which the running material web is passed through.

In other words, this second is according to the invention Device the applicator, the counter surface and the press roller assigned its own press roll counter roll, while at previously explained first device according to the invention Applicator and the press roller a common counter surface assigned.

• eine zweite Gegenfläche, die gleichsinnig zur ersten Preßwalze rotiert und dieser, bezogen auf die Durchlaufrichtung der Materialbahn, im Abstand nachgeschaltet ist, wobei die laufende Materialbahn auf der Oberfläche der zweiten Gegenfläche entlang eines Auflageabschnitts derart geführt ist, daß die bereits mit dem Medium versehene Seite der Materialbahn auf der Walzenoberfläche aufliegt,
• ein zweites Auftragswerk zum direkten Auftragen eines flüssigen oder pastösen Mediums auf eine Seite einer laufenden Materialbahn,
• eine gegensinnig zur zweiten Gegenfläche rotierende zweite Preßwalze zum Einpressen von auf einer Seite der materialbahn aufgetragenem flüssigen oder pastösen Medium in die laufende Materialbahn und
• eine gegensinnig zur zweiten Preßwalze rotierende zweite Preßwalzengegenwalze.

An advantageous embodiment of the second device according to the invention for applying the liquid or pasty medium on both sides to the running waste paper-containing material web comprises

• a second counter surface which rotates in the same direction as the first press roll and which is connected at a distance therefrom in relation to the direction of travel of the material web, the running material web being guided on the surface of the second counter surface along a support section such that the side already provided with the medium the material web lies on the roller surface,
• a second application unit for the direct application of a liquid or pasty medium to one side of a running material web,
• a second press roller rotating in the opposite direction to the second counter surface for pressing liquid or pasty medium applied on one side of the material web into the running material web and
• a second press roll counter roll rotating in the opposite direction to the second press roll.

The second application is the support section of the Material web on the surface of the second counter surface assigned and the second press roller is the one from the second Commissioned work with the medium side of the material web, based on the direction of travel of the material web, at a distance assigned to the second counter surface and forms with the second press roll counter roll from a press nip through the running material web is passed through.

In other words, the second is in this embodiment Device according to the invention for coating one side a similar device for the running material web Coating the other side of the running material web downstream. Each commissioned work is its own Mating surface assigned and each press roll is one assigned own press roll counter roll.

In the previously explained devices according to the invention the rotating counter surfaces preferably in the form of rotating counter rolls. Likewise, the rotating counter surfaces but also in the form of rotating ones flexible endless belts. Such revolving Endless belts are then driven by associated drive rollers, Deflection pulleys, tension pulleys and / or sliding or press shoes guided.

• zwei Auftragswerke (diese können vom gleichen Typ sein), von denen jeweils eines ein flüssiges oder pastöses Medium auf jeweils eine der beiden Seiten der laufenden Materialbahn in direktem Auftrag aufbringt, und
• zwei gegensinnig zueinander rotierende Preßwalzen vom gleichen Typ, von denen jeweils eine das auf die jeweilige Seite der beiden Seiten der Materialbahn aufgetragene flüssige oder pastöse Medium in die laufende Materialbahn einpreßt.

A third device according to the invention for the two-sided application of a liquid or pasty medium, such as pigment-containing coating color, starch or impregnating liquid, to a running web of waste paper-containing paper or cardboard

• two application units (these can be of the same type), one of which applies a liquid or pasty medium to either side of the running material web in direct application, and
• two oppositely rotating press rolls of the same type, one of which presses the liquid or pasty medium applied to the respective side of the two sides of the material web into the running material web.

The two commissioned works face each other and are each one side of the running material web assigned that the web of material between the two Commissioned works is carried out. Furthermore, the two are Press rolls, based on the direction of flow of the Material web, at a distance according to the two commissioned works arranged that the two press rolls one between them Form press-in gap through which the running material web is passed, the running directions of the two Press rolls in the press nip with the direction of flow of the Material web match.

The third device according to the invention thus takes place first a direct application of a liquid on both sides or pasty medium on the material web by placing between two commissioned works is carried out, and then the previously applied is pressed in on both sides Medium into the material web by placing it between two with the Direction of travel of the material web co-rotating press rolls is passed through.

In the previously described third invention The device runs in a favorable embodiment Direction of travel of the material web, based on a horizontal plane, from bottom to top. Preferably the Material web in a common pass plane both through the two applicators as well as the two press rolls passed.

In a preferred embodiment of the previously explained Devices according to the invention are the works as Doctor element pressure chamber applicators. The doctor elements are preferably profiled Squeegee rods, smooth squeegee rods or squeegee blades. The use of profiled doctor blades is insofar advantageous than then the metering of the medium to be applied done volumetrically, i.e. the amount of medium applied is practically independent of the machine speed. Thus, the desired amount of liquid or pasty medium can be applied very reliably.

In a further embodiment of the invention The application units can be device as free jet application units be trained.

A favorable embodiment of the third explained above The device according to the invention is the two To design commissioned works as doctor blade element commissioned works a sump of the medium to be applied with a free one Form the liquid surface. The associated one Direction of travel of the material web through the two sump application plants then runs in relation to a horizontal Level, top down. The squeegee elements of the sump application works are preferably as profiled doctor rods, smooth doctor blades or doctor blades.

There is an embodiment of the devices according to the invention in the order works in a pre-metering device for direct application of an excess amount of liquid or pasty medium on one side of the running material web and a subsequent separate final metering device for Dosing the amount applied to the material web Medium to the desired final order quantity divide. The pre-metering devices can then be used as Doctor blade element pressure chamber applicator units, doctor element sump application units, Free jet nozzle works or in be formed in a comparable manner. The Final metering devices can be used as doctor blade final metering devices or in a similar way. be trained.

The application works are preferably in the inventive Devices, however, as ready-made order works trained, i.e. with them can be a desired final Quantity of medium applied directly to the material web be applied without the need for further dosing.

For this purpose, those already explained above are preferably used Doctor element pressure chamber applicators or doctor element sump applicators used.

• ein Freistrahlauftragswerk zum direkten Auftragen eines flüssigen oder pastösen Mediums auf eine Seite einer laufenden Materialbahn,
• eine rotierende Preßwalze zum Einpressen von auf einer Seite der Materialbahn aufgetragenem flüssigen oder pastösen Medium in die laufende Materialbahn, und
• eine gegensinnig zur Preßwalze rotierende Preßwalzengegenwalze.

A fourth device according to the invention for applying a liquid or pasty medium, such as pigment-containing paint, starch or impregnating liquid, to a running web of waste paper, made of paper or cardboard

• a free jet applicator for direct application of a liquid or pasty medium on one side of a running material web,
• a rotating press roll for pressing liquid or pasty medium applied to one side of the material web into the running material web, and
• a press roll counter roll rotating in the opposite direction to the press roll.

The free jet application is on the top page an essentially horizontal, unsupported one Assigned to section of the material web and the press roll, based on the direction of travel of the material web, at a distance based on the free jet commissioned work previously with the medium assigned side of the material web and forms a press nip together with the press roll counter roll, through which the running material web is passed. The The direction of the press roll in the press nip coincides the direction of travel of the material web.

The fourth device according to the invention is therefore not required a rotating counter surface, i.e. for the commissioned work no assigned counter roller or no assigned endless belt required. The direct application of the liquid or pasty Medium is essentially horizontal running, unsupported section of the material web. In Direction of travel of the material web seen before the position of the commissioned work is sufficient the arrangement of a deflection roller, around the material web in the essentially horizontal To redirect the running direction.

The free jet commission is at the fourth Device according to the invention preferably in the form of a Commissioned work based on the principle of a waterfall. In such a commissioned work, what is to be applied flows liquid or pasty medium like a waterfall from the application in an appropriately dosed amount to that under the Commissioned material web passing by. The top side of the material web is so with the medium coated.

An advantage of the devices according to the invention is that that by the separate provision of press rolls Material selection and the surface properties of the Press roll surface optimally to the requirements regarding a good press-in process can be adapted. at previous devices, in which initially an order from liquid or pasty medium on the surface of a Application roller takes place from where the medium is then in one Roll nip is transferred to the running material web (indirect order), the material selection and the selection of the surface condition of the application roller mainly after that the medium is good on the Roller surface can be applied, i.e. the surface is well wettable. The choice of materials and the However, the surface quality of the application roller cannot to the same extent on the press-in function of the application roller in Application roller gap to be coordinated. Since according to the invention now the order of the medium in a separate upstream Step directly and immediately onto the material web, and pressing the medium into the material web as separate separate step is carried out, the Press rolls with regard to their constructive and optimal design of the material Press-fit function can be adjusted.

In advantageous configurations, at least Roll surfaces of the press rolls made of steel, rubber or Polyurethane trained. It can be advantageous in each case be, the roll surfaces of the press rolls in addition a non-stick cover with a comparatively small one To provide friction coefficient. Such a non-stick cover exists preferably made of a material on polytetrafluoroethylene (PTFE) basis. Such a Teflon cover effectively avoids that Adhesion of the applied medium to the press rolls. Depending on The press rolls can be used with a possible be smooth, hard surface, or with a soft surface with such a texture that the applied medium practically does not adhere to it.

The rotational speed preferably corresponds to Roll surface of the press roll of the throughput speed the material web in the press nip. So there is none Relative speed between the press roll surface and Material web in front, and thus practically none occurs On paper.

In a preferred embodiment, the press rolls are included provided a heater that at least the Roll surface heats. This will dry the accelerated applied medium on the material web.

In a further preferred embodiment, a cleaning device is assigned to each press roll on a peripheral portion of its roll surface. In a favorable embodiment, the cleaning device has a scraping blade, which pulls dirt particles, which were removed from the material web in the press-in nip, from the roller surface. In connection with an associated cleaning device, it is advantageous to design the surface of the press roll from a hard material so that the surface quality of the press roll is not damaged by the cleaning scraping blade or dirt particles accumulated thereon.

The inventive method and the inventive Devices are used to glue Material webs, but also for the application of various liquid or pasty coating media, such as Coating color with pigments, starch, impregnating solution and like.

In the inventive method and in the inventive The application of the liquid or pasty medium always directly on the material web, so without the interposition of an application roller, and the pressing the applied medium in the material web is always done separate from the process of applying the medium to the Web. In this way it is prevented that possibly during pressing from the running material web loosened impurities or dirt particles in the Order work arrive and the order quality of the medium can deteriorate the running material web.

Fig. 1

ein erstes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung in einer schematischen Querschnittsansicht;

Fig. 2

ein zweites Ausführungsbeispiel der erfindungsgemäßen Vorrichtung in einer schematischen Querschnittsansicht;

Fig. 3

ein drittes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung in einer schematischen Querschnittsansicht;

Fig. 4

ein viertes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung in einer schematischen Querschnittsansicht;

Fig. 5

ein fünftes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung in einer schematischen Querschnittsansicht;

Fig. 6

ein sechstes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung in einer schematischen Querschnittsansicht;

Fig. 7

ein siebtes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung in einer schematischen Querschnittsansicht.

Preferred exemplary embodiments of the method according to the invention and the devices according to the invention are explained in more detail below with reference to the accompanying drawings. Show it:

Fig. 1

a first embodiment of the device according to the invention in a schematic cross-sectional view;

Fig. 2

a second embodiment of the device according to the invention in a schematic cross-sectional view;

Fig. 3

a third embodiment of the device according to the invention in a schematic cross-sectional view;

Fig. 4

a fourth embodiment of the device according to the invention in a schematic cross-sectional view;

Fig. 5

a fifth embodiment of the device according to the invention in a schematic cross-sectional view;

Fig. 6

a sixth embodiment of the device according to the invention in a schematic cross-sectional view;

Fig. 7

a seventh embodiment of the device according to the invention in a schematic cross-sectional view.

1 is a first embodiment of the Device according to the invention shown. An ongoing Material web made of paper or cardboard is first about a deflection roller 10. The direction of travel of the material web 7 is indicated by arrows along the material web. The material web 7 is then in the direction of the arrow rotating counter roll 1 out. The material web 7 lies thereby along the roller surface 1A of the counter roller 1 of a support section and is so during the run supported by the counter roller. Then the Material web 7 of a second rotating in the direction of the arrow Counter roll 4 fed, on the roll surface 4A it rests along a support section and so during the Pass is supported. Then the material web 7 over a pulley 10 'performed and further processing fed.

Along the passage of the material web 7 just described is the material web in the area in which it is on the Counter roll 1 rests, initially assigned an application unit 2. The material web 7 is at a distance thereafter in the running direction also in the area where it is on the counter roller 1 rests, assigned a press roll 3. Further the Following the direction of travel of the material web is Material web 7 in the area in which it is on the second Counter roll 4 rests, assigned a second applicator 5. The material web is still in the direction of travel at a distance thereafter the area in which it rests on the counter roller 4, a assigned second press roll 6.

The two commissioned works 2 and 5 are Doctor element-pressure chamber applicators of the same type, so that hereafter both orders, each only simplified are shown, together in their structure and their How it works will be explained. The commissioned works 2, 5 comprise a support beam 17, 17 ', the other Add-on elements. Through a color distribution tube 11, 11 ' the liquid or pasty medium 8, 8 'to be applied to one Feed gap 12, 12 '. fed. In the direction of the arrow that will medium to be applied under pressure from an application chamber supplied between a doctor element 9, 9 'and a Boundary wall 18, 18 'is formed. The doctor element 9, 9 'is designed in the example as a profiled doctor rod, which in a doctor bed 15, 15 'rotatable about its longitudinal axis is stored. A dashed line in the representation of the Doctor rod 9, 9 'indicates the length of the doctor rod attached transverse grooves to the profile of the doctor rod establish. The order chamber becomes pressurized standing medium 8, 8 'on the doctor element 9, 9' on the Material web 7 applied evenly. The doctor rod 9, 9 ' is usually in the opposite direction to the direction of rotation Counter roll 1, 4 driven in rotation.

The profiling of the doctor rod 9, 9 ', that is, in the example transverse grooves arranged along its longitudinal extent, enables volumetric dosing of the applied Amount of medium, i.e. the desired final order quantity of medium can be added directly to the without further metering Material web 7 are applied. Because the commissioned work liquid or pasty medium directly onto the material web 7 orders, it is the so-called direct Assignment. On the side facing away from the doctor rod 9, 9 ' Order chamber can excess, pressurized Medium between the boundary wall 18, 18 'and the counter roller 1, 4 flow into a collecting trough 13, 13 '. To the squeegee 9, 9 'with a desired pressing force against the counter roller To press 1, 4, a pressure hose 14, 14 'is provided.

The two press rolls 3, 6 are also from the example same type and are therefore common below explained. Each press roll 3, 6 forms with the associated Counter roll 1, 4 from a press nip. The one on the surface the counter roll 1, 4 lying material web 7 is by the Press-fit led. The press roll 3, 6 is with a desired contact force F radially against the surface of the Counter roll 1, 4 pressed. The press roll 3, 6 is in Direction of arrow driven in rotation. The running speeds the surfaces of the press roll 3, 6 and the counter roll 1, 4 are the same, i.e. none occurs in the press-in gap Relative movement of the press roll 3, 6 relative to the material web 7, which rests on the counter roller 1, 4.

Die Materialbahn 7 passiert zunächst auf der Oberfläche der ersten Gegenwalze 1 das erste Auftragswerk 2. Dort wird die dem Auftragswerk 2 zugewandte Seite der Materialbahn beispielsweise mit einer gewünschten endgültigen Auftragsmenge an flüssigem oder pastösem Medium 8 beschichtet. Die so auf der einen Seite beschichtete Materialbahn 7 passiert anschließend die Preßwalze 3, welche das zuvor aufgetragene Medium 8 in die Materialbahn 7 einpreßt. Anschließend wird die Materialbahn 7 derart über die zweite Gegenwalze 4 geführt, daß die bereits beschichtete Seite auf der Gegenwalze aufliegt, während die noch unbeschichtete Seite der Materialbahn 7 dem zweiten Auftragswerk 5 zugewandt ist. Diese Seite wird nun vom Auftragswerk 5 beispielsweise mit einer gewünschten endgültigen Auftragsmenge an Medium 8' beschichtet. Danach passiert die Materialbahn 7 die zweite Preßwalze 6, welche das zuvor aufgetragene Medium 8'in die Materialbahn 7 einpreßt. Anschließend wir die nun beidseitig mit Medium 8, 8' beschichtete Materialbahn 7 einem weiteren Bearbeitungsschritt (nicht dargestellt) zugeführt.

The function of the first exemplary embodiment of the device according to the invention is explained below:

The material web 7 first passes the first application unit 2 on the surface of the first counter-roller 1. There, the side of the material web facing the application unit 2 is coated, for example, with a desired final application quantity of liquid or pasty medium 8. The material web 7 coated in this way on one side then passes through the press roll 3, which presses the previously applied medium 8 into the material web 7. Subsequently, the material web 7 is guided over the second counter roller 4 in such a way that the already coated side rests on the counter roller, while the still uncoated side of the material web 7 faces the second applicator unit 5. This page is now coated by the application unit 5, for example with a desired final order quantity of medium 8 '. The material web 7 then passes through the second press roller 6, which presses the previously applied medium 8 ′ into the material web 7. The material web 7, which is now coated on both sides with medium 8, 8 ', is then fed to a further processing step (not shown).

Depending on requirements, this can be done on both sides of the material web same medium or the applied medium Media 8, 8 'can be of different consistency. Furthermore, the final ones applied on both sides Order quantities can be the same or it can be for both parties different order quantities can be selected.

The device shown in Fig. 1 is used on both sides Application of liquid or pasty medium on a running waste paper containing Web. If you only take half of this device, either the left of the dashed line 16 or the shown on the right of the dashed line 16 in FIG. 1 Half, you get an embodiment of the Device according to the invention, which is for the order of a Medium on only one side of a running material web can be used.

In the second embodiment shown in FIG. 2 the device according to the invention are the same or different corresponding components with the same reference numerals provided, as in the first embodiment in Fig. 1st As for the details of these components, therefore referred to the previous statements.

A running material web 7 is first over a Deflection roller 10 guided and then along one Support portion around the roll surface 1A of a counter roll 1 led around. In the area of this support section Material web 7 on the counter roller 1 is the material web Assigned to work order 2. The counter roll 1 is in Direction of arrow driven in rotation and guides the material web 7 further by a at a distance after the counter roller 1 arranged press-in gap. This press-in gap is between a press roll 3 and a press roll counter roll 19 educated. The press roll 3 and the press roll counter roll 19 rotate in opposite directions to each other Arrow directions and are driven so that the Running speeds of the surfaces of the two rollers 2 and 19 the throughput speed of the material web 7 in Correspond to the press-in gap. This makes relative movements avoided between the roller surfaces and the material web. Then the material web 7 over a second Counter roll 7 guided such that the previously on the first Counter roll 1 outer side of the material web now along a support portion on the roller surface 4A of second counter roller 4 rests. In the area where the Material web rests on the counter roller 4, it is a assigned second commission 5. The second counter roll 4 is driven and conveyed in the direction of the arrow Material web continues to a second press nip. This second press nip is between a second press roll 6 and a second press roll counter roll 20 is formed. The two Rollers 6 and 20 rotate in opposite directions in the direction of the arrow to each other and are driven such that the Running speeds of their roller surfaces in the press nip with the throughput speed of the material web to match. Then the material web is over a Deflection roller 10 'forwarded.

Wenn die Materialbahn 7 das erste Auftragswerk 2 passiert, wird dort die dem Auftragswerk zugewandte Seite der Materialbahn direkt mit einem flüssigen oder pastösen Medium 8 beschichtet. Das Medium 8 kann unmittelbar in einer gewünschten endgültigen Auftragsmenge aufgetragen werden. Im Einpreßspalt zwischen der Preßwalze 3 und der Preßwalzengegenwalze 19 wird das zuvor aufgetragene Medium 8 in die Materialbahn eingepreßt. Dabei wird die Preßwalze 3 mit einer gewünschten Kraft F radial gegen die Preßwalzengegenwalze 19 gedrückt. Anschließend wird auf die andere Seite der Materialbahn vom Auftragswerk 5 ein flüssiges oder pastöses Medium 8' direkt aufgetragen. Der Auftrag kann ebenfalls unmittelbar in einer gewünschten endgültigen Auftragsmenge erfolgen. Beim Passieren des zweiten Einpreßspalts wird das zuvor aufgetragene Medium 8' in die Materialbahn eingepreßt. Dabei wird die zweite Preßwalze 6 mit einer gewünschten Andrückkraft F radial gegen die zweite Preßwalzengegenwalze 20 gedrückt.

The function of the second exemplary embodiment of the device according to the invention is explained below:

When the material web 7 passes the first applicator 2, the side of the material web facing the applicator is coated directly with a liquid or pasty medium 8. The medium 8 can be applied directly in a desired final order quantity. The previously applied medium 8 is pressed into the web of material in the press nip between the press roll 3 and the press roll counter roll 19. The press roll 3 is pressed radially against the press roll counter roll 19 with a desired force F. Subsequently, a liquid or pasty medium 8 'is applied directly to the other side of the material web by the applicator 5. The order can also be placed immediately in a desired final order quantity. When passing through the second press-in gap, the previously applied medium 8 'is pressed into the material web. The second press roll 6 is pressed radially against the second press roll counter roll 20 with a desired pressing force F.

The individual components, such as the commissioned works 2, 5, Counter rolls 1, 4 and the press rolls 3, 6 correspond in their Design in the example of the first explained above Embodiment according to FIG. 1. In addition, there are now two Press roll counter rolls 19, 20 are provided. In contrast to 1 form the press rolls 3, 6 in the second embodiment, the injection gap with the counter rolls 1, 4, but with these additional Press roll counter rolls 19, 20.

If you take only half on one side of the Dashed line 16 in Fig. 2, so you get one Another embodiment of the device according to the invention for an application of liquid or pasty medium on only one side of the running web of material.

Also in the third embodiment of the invention The device shown in Fig. 3 are the same or corresponding components as in the first embodiment in Fig. 1 with the same reference numerals and it will therefore referred to the explanations there.

In the third embodiment, there are two doctor element pressure chamber applicators 2, 5 facing each other and forming a gap between them through which the running material web 7 is passed. In the running direction of the material web 7 in Distance thereafter are two press rolls 3, 6 one another arranged opposite one another and form one between them Press-in gap through which the material web 7 passes becomes. The material web 7 is guided such that its Direction of travel, based on a horizontal plane in Fig. 3, runs from bottom to top. The running material web 7 will along a common pass plane 22, which is shown in FIG. 3 is indicated by a dash-dotted line, both by the two commissioned works 2, 5 as well as by the two Press rolls 3, 6 passed through. This results in a Simple web guidance without changing the direction of the material web in the area of the application and press-in process.

The doctor bars 9, 9 'of the two applicators 2, 5 form in addition to their respective order function for the liquid or pasty medium 8, 8 ', for each other Doctor rod a counter support. This arrangement, in which the two doctor rods 9, 9 'are pressed against each other, comes therefore without counter-rollers, which would otherwise have the counter-holding function when applying directly to the material web.

The two press rolls 3, 6 are also supported against each other and each with a desired Pressing force F pressed against each other. The Running speeds of the roller surfaces of the two Press rolls 3, 6 correspond to the throughput speed of the Material web in the press nip. Each roller surface 3A, 6A a cleaning device 21, 21 'is assigned. The Cleaning devices 21, 21 'are only schematic shown. Each cleaning device has one Scraper blade 23, 23 'on the impurities or Dirt particles that may be in the Press-in gap can be detached from the material web 7 by peel off the roller surfaces 3A, 6A to prevent the impurities or dirt particles from the Press rolls 3, 6 on the already coated material web could be promoted. Such or similar Cleaning devices are also useful on the Press rolls 3, 6 of the previously explained first and second Embodiments of the invention provided.

Heater devices 24, 24 'are shown by dashed lines schematically indicated, each of which each press roll 3, 6 is assigned. With each of the rotating in the direction of the arrow driven press rolls 3, 6 in the example the area between the dashed circular line and the roller surface 3A, 6A heated. This will dry the previously liquid or pasty medium 8, 8 'applied on both sides accelerates when the medium 8, 8 'in contact with the heated roller surfaces 3A, 6A comes. Both schematically illustrated heating devices 24, 24 'can are, for example, electrical heating devices or heating devices in which a circuit of a heated, for example liquid medium maintained becomes. Other suitable heating devices can also be used become. This also applies to the first and second ones explained above Embodiments according to FIG. 1 and FIG. 2 can press rolls 3, 6 there are provided with heating devices.

In the third embodiment shown in Fig. 3 the running material web 7 first passes the two Commissioned works 2, 5 the running material web 7 a desired one final application quantity of liquid or pasty medium 8, 8 'are applied. The order is placed again immediately on the material web and both the order quantity as well the consistency of medium 8, 8 'can be on both sides of the Material web can be selected differently. This on both sides coated material web 7 then runs through the press nip between the two press rolls 3, 6. There it will previously applied medium 8, 8 'from both sides into the Pressed material web 7. Through the heated Roller surfaces 3A, 6A will dry out the Medium accelerated in the material web additionally.

4 is a fourth embodiment of the Device according to the invention shown that in his Basic structure of the third exemplary embodiment according to FIG. 3 is similar. With regard to the arrangement and function of the Press rolls 3, 6 will therefore refer to the previous statements directed. Cleaning devices 21, 21 'and Heaters 24, 24 ', the fourth Embodiment may also be present are from Omitted for clarity. The fourth too The running material web is in one embodiment common level 22 both through two opposite Application units as well as two opposing press rolls 3, 6 passed. The direction of travel of the material web 7 runs, with respect to a horizontal plane in Fig. 4, of top down.

The two opposing orders 2 ', 5' are in Example designed as a doctor element sump applicator. The same or corresponding elements of these commissioned works are provided with the same reference numerals as in the previous ones explained doctor element pressure chamber applicators 2, 5. With regard to these elements, reference is made to the previous ones Executions referenced.

The paint to be applied flows from paint distribution tubes 11, 11 ' liquid or pasty medium 8, 8 'each in a sump free liquid level. The swamp becomes liquid or pasty medium 8, 8 'under the action of gravity over the profiled doctor rods 9, 9 'to the respective side the material web 7 applied. The applied Amount of medium of the valid desired order quantity correspond. Again, the order quantity and the Consistency of the medium 8, 8 'for both sides of the material web can be chosen differently. The order is made on both sides directly onto the material web.

The material web 7 thus first passes through the two opposite commissioned works 2 ', 5', initially through the two swamps and then the Doctor bars 9, 9 'happens. The medium applied on both sides 8, 8 'is then in the press gap between the two Press rolls 3, 6 are pressed into the material web.

The fifth embodiment shown in FIG device according to the invention corresponds, apart from Commissioned work, the left of the dashed line 16 in Fig. 1 illustrated embodiment. Therefore, it will focus on those there References referred to and only the following different structure of the commissioned work explained.

The applicator is in a pre-metering device 25 and End dosing device 26 divided, each only are shown schematically. The predosing device 25 is trained in the example as a free jet nozzle work, the via a feed gap 28 liquid or pasty medium directly to the relevant side of the running material web 7 applies. The medium is applied in a free one Beam and in a larger than the desired final order quantity. The final dosing device 26 doses in the example over a doctor blade 27 the excess amount to the desired final order quantity by doing the stripped too much applied medium 8. Although with this Embodiment the commissioned work in two sub-facilities divided, of which the final metering device 26 of the Predosing device 25 along the support section of the Material web is connected on the counter roll 1, however is also the separation of orders in this embodiment the medium and pressing the medium into the material web maintained.

The sixth embodiment shown in FIG Device according to the invention corresponds in its basic structure that shown in Fig. 2 to the left of the dashed line 16 Embodiment. Regarding more consistent Components is therefore based on the designs there directed. Unlike the fifth embodiment in Fig. 5 is the sixth embodiment Free jet nozzle application no final metering device downstream, but the free jet nozzle unit 25 carries directly the desired final amount of liquid or pasty medium 8. With regard to the basic structure, the function and assignment of the free jet nozzle work 25 is based on the previous statements in Related to Fig. 5. The sixth 6 is an additional embodiment Doctor element, as it is in the fifth embodiment in the form the doctor blade 27 is avoided. This will also avoided interference on such a doctor element, the may occur due to dirt on the doctor element could.

Both the fifth and the sixth embodiment can each have a similar device for coating the be connected downstream of the material web.

In the seventh embodiment shown in FIG device according to the invention is not the application work Mating roller assigned. Regarding more consistent Components and in particular with regard to the structure of the Function and the arrangement of the press roll 3 and Press roll counter roll 19 is based on the statements in Connection with the preceding exemplary embodiments directed.

Guide or deflection rollers 10, 10 'is the current Material web 7 in a substantially horizontal Running direction. In the direction of travel of the material web seen after the leadership or Deflection roller 10 'is the one above lying side of the material web 7 a free jet application 29 assigned. The material web is in this order area So not supported, but runs freely between the Guide or deflection roller 10 'and the downstream Press roll arrangement 3, 19. The free jet applicator 29 consists of a color distribution tube 30, which has a Feed gap 31 with an overflow surface 32 is connected. The Medium 8 to be applied passes from the paint distribution tube 30 the supply gap 31 onto the overflow surface 32 and flows from there in free fall to the one below Material web down. On the free jet application 29 can additional regulatory bodies (not shown) may be provided, by the amount of waterfall-like from the overflow surface 32 descending film of coating medium 8 on the to dose the desired amount. With such a commission 29, also known as a "curtain coater", becomes a Contactless direct application of the medium realized. As a result, the commissioned work may be on the Material web does not affect existing dirt.

Of course, the individual can Embodiments with each other in a variety of ways be combined. For example, the one shown in FIG Device for coating one side of the material web 7 with the device for coating the other side of the Material web can be combined in Fig. 2 on the right the dashed line 16 side is shown. Or it may be the one on the left of the dashed line Line 16 in Fig. 1 device for coating the one side of the material web 7 with that on the right side the dashed line 16 in Fig. 2 device for Coating the other side of the material web combined become.

Of course, it is also possible, if necessary Reaching the second commission 5 Drying device for those already using the medium 8 provided side of the material web 7 to be provided.

Claims (31)

1. Process for applying a liquid or pasty medium, such as pigment-containing coating colour, starch, impregnating liquid, to a moving paper or board web containing waste paper, having the following steps:

   direct application (2, 5; 2', 5') of a liquid or pasty medium (8, 8') to at least one side of the moving web (7),

   subsequent separate pressing (3, 6) of the medium (8, 8') applied to at least one side of the web (7) into the moving web.
2. Process according to Claim 1 for applying the liquid or pasty medium to both sides of the moving web, characterized

   in that the liquid or pasty medium (8, 8') is applied (2, 5; 2', 5') simultaneously and directly to each side of the moving web (7), and

   in that the subsequent separate pressing (3, 6) of the applied medium (8, 8') into the moving web (7) is carried out simultaneously on both sides of the material web.
3. Process according to Claim 1 for applying the liquid or pasty medium to both sides of the moving web, having the following steps:

   direct application of the liquid or pasty medium (8) to one side of the moving web (7);

   subsequent separate pressing (3) of the medium (8) applied to one side of the web (7) into the moving web;

   direct application of the liquid or pasty medium (8') to the other side of the moving web (7);

   subsequent separate pressing (6) of the medium (8') applied to the other side of the material web (7) into the moving web.
4. Process according to one of Claims 1 to 3, characterized in that the direct application (2, 5; 2', 5') of the liquid or pasty medium (8, 8') is carried out with a desired, final application quantity.
5. Process according to one of Claims 1 to 3, characterized in that the direct application of the liquid or pasty medium to either side of the moving web is subdivided into the following part-steps:

   pre-metering (25) an excess quantity of liquid or pasty medium (8) onto the relevant side of the web (7);

   subsequent final metering of the pre-metered quantity of medium (8) applied to the relevant side of the web (7) to the desired final application quantity.
6. Apparatus for applying a liquid or pasty medium, such as pigment-containing coating colour, starch, impregnating liquid, to a moving paper or board web containing waste paper, comprising

   an applicator (2) for the direct application of a liquid or pasty medium (8) to at least one side of the moving web (7),

   a rotating backing surface (1), on whose surface (1A) the moving web (7) is guided along a contact section, and

   a press roll (3), rotating in the opposite direction to the backing surface (1), for pressing the liquid or pasty medium applied to one side of the web (7) into the moving web (7),

   first of all the applicator (2) being assigned to the contact section of the web (7) on the surface (1A) of the backing surface (1), as based on the passage direction of the web, and, at a distance downstream thereof, the press roll (3) being assigned to the said contact section of the web (7), forming a press nip with the backing surface.
7. Apparatus according to Claim 6 for applying the liquid or pasty medium to both sides of the moving web of paper or board containing waste paper, characterized

   in that a second backing surface (4), rotating in the opposite direction, is connected at a distance downstream of the first backing surface (1), as based on the passage direction of the web, on whose surface (4A) the moving web (7) is guided along a contact section in such a way that the side of the web (7) already provided with the medium (8) rests on the roll surface (4A),

   in that a second applicator (5) for the direct application of a liquid or pasty medium (8') to one side of a moving web (7) is provided, and

   in that a second press roll (6), rotating in the opposite direction to the second backing surface (4), is provided for pressing liquid or pasty medium (8') applied to one side of the web (7) into the moving web (7),

   first of all the applicator (5) being assigned to the contact section of the web (7) on the surface (4A) of the backing surface (4), as based on the passage direction of the web, and, at a distance downstream thereof, the second press roll (6) being assigned to the said contact section of the web (7), forming a press nip with the second backing surface (4).
8. Apparatus for applying a liquid or pasty medium, such as pigment-containing coating colour, starch, impregnating liquid, to a moving paper or board web containing waste paper, comprising

   an applicator (2) for the direct application of a liquid or pasty medium (8) to at least one side of the moving web (7),

   a rotating backing surface (1), on whose surface (1A) the moving web is guided along a contact section,

   a press roll (3), rotating in the opposite direction to the backing surface, for pressing liquid or pasty medium (8) applied to one side of the web (7) into the moving web, and

   a press-roll backing roll (19), rotating in the opposite direction to the press roll (3),

   the applicator (2) being assigned to the contact section of the web (7) on the surface (1A) of the backing surface (1), and the press roll (3), as based on the passage direction of the web, being assigned to the side of the web (7) previously provided with the medium (8), at a distance downstream of the backing surface (1), and, together with the press-roll backing roll (19), forming a press nip through which the moving web (7) is led.
9. Apparatus according to Claim 8 for the application of the liquid or pasty medium to both sides of the moving web of paper or board, characterized

   in that a second backing surface (4), rotating in the same direction, is connected at a distance downstream of the first press roll (3), as based on the passage direction of the web, on whose surface (4A) the moving web (7) is guided along a contact section in such a way that the side of the web (7) already provided with the medium (8) rests on the roll surface (4A),

   in that a second applicator (5) for the direct application of a liquid or pasty medium (8') to one side of a moving web (7) is provided,

   in that a second press roll (6), rotating in the opposite direction to the second backing surface (4), is provided for pressing liquid or pasty medium (8') applied to one side of the web (7) into the moving web (7), and

   in that a second press-roll backing roll (20) rotating in the opposite direction to the second press roll (6) is provided,

   the second applicator (5) being assigned to the contact section of the web on the surface (4A) of the backing surface (4), and the second press roll (6), as based on the passage direction of the web, being assigned to the side of the web (7) previously provided with the medium (8') by the second applicator (5), at a distance downstream of the second backing surface (4), and, together with the second press-roll backing surface (20), forming a press nip through which the moving web (7) is led.
10. Apparatus according to either of Claims 6 and 9, characterized in that the rotating backing surface is constructed in the form of a rotating backing roll (1, 4) or in the form of a circulating flexible endless belt.
11. Apparatus for applying a liquid or pasty medium, such as a pigment-containing coating colour, starch, impregnating liquid, to both sides of a moving paper or board web containing waste paper, comprising

    two applicators (2, 5; 2', 5') for the direct application of a liquid or pasty medium (8, 8') to each of the two sides of the moving web (7), and

    two press rolls (3, 6), rotating in opposite directions to each other, for pressing liquid or pasty medium (8, 8') applied to the two sides of the web (7) into the moving web,

    the two applicators (2, 5; 2', 5') being located opposite each other and in each case being assigned to one side of the moving web (7) in such a way that the material web is led through between the two applicators, and the two press rolls (3, 6), as based on the passage direction of the material web, being arranged at a distance downstream of the two applicators (2, 5; 2', 5'), in such a way that the two press rolls (3, 6) form a press nip between them, through which the moving web (7) is led, the running directions of the two press rolls in the press nip coinciding with the passage direction of the web.
12. Apparatus according to Claim 11, characterized in that the passage direction of the web (7), as based on a horizontal plane, runs from bottom to top.
13. Apparatus according to Claim 12, characterized in that the web (7) is led in a common passage plane (22) through the two applicators (2, 5; 2', 5') and the two press rolls (3, 6).
14. Apparatus according to one of Claims 6 to 13, characterized in that the applicators are constructed as doctor-element pressure-chamber applicators (2, 5).
15. Apparatus according to one of Claims 6 to 13, characterized in that the applicators are constructed as free-jet nozzle applicators.
16. Apparatus according to Claim 11, characterized in that the two applicators are constructed as doctor-element applicators (2', 5'), forming a pond of the liquid or pasty medium (8, 8') with a free surface, the passage direction of the web (7) through the two applicators, as based on a horizontal plane, running from top to bottom.
17. Apparatus according to Claim 14 and 16, characterized in that the doctor elements (9, 9') are constructed as profiled doctor rods, smooth doctor rods or doctor blades.
18. Apparatus according to one of Claims 6 to 13, characterized in that the applicators are subdivided into a pre-metering device (25) for the direct application of an excess quantity of liquid or pasty medium (8) to one side of the moving web (7) and a subsequent, separate final metering device (26) for metering the quantity of medium (8) applied to the web (7) to the desired final application quantity, or are constructed in such a way that the desired final application quantity can be applied with them.
19. Apparatus according to Claim 18, characterized in that the pre-metering devices (25) are constructed as doctor-element pressure-chamber applicators, doctor-element pond applicators or free-jet nozzle applicators.
20. Apparatus according to Claim 18, characterized in that the final metering devices (26) are constructed as doctor-blade final metering devices.
21. Apparatus according to one of Claims 6 to 20, characterized in that the roll surfaces (1A, 4A) of the backing rolls (1, 4) are of resilient rubber-covered construction.
22. Apparatus for applying a liquid or pasty medium, such as pigment-containing coating colour, starch, impregnating liquid, to a moving paper or board web containing waste paper, comprising

    a free-jet applicator (29) for the direct application of a liquid or pasty medium (8) to one side of the moving web (7),

    a rotating press roll (3) for pressing liquid or pasty medium (8) applied to one side of the web (7) into the moving web, and

    a press-roll backing roll (19), rotating in the opposite direction to the press roll (3),

    the free-jet applicator (29) being assigned to the upper side of a section of the web (7) which runs substantially horizontally and is not supported, and the press roll (3) being assigned to the side of the web (7) previously provided with the medium (8) at a distance downstream of the free-jet applicator (29), as based on the passage direction of the web, and, together with the press-roll backing roll (19), forming a press nip through which the moving web (7) is led, the running direction of the press roll (3) in the press nip corresponding to the passage direction of the web.
23. Apparatus according to Claim 22, characterized in that the free-jet applicator (29) is constructed as an applicator on the principle of a waterfall, in which the liquid or pasty medium (8) flows down onto the moving web (7) in free fall.
24. Apparatus according to one of Claims 6 to 23, characterized in that the press rolls (3, 6) are constructed from steel, at least at their roll surface (3A, 6A).
25. Apparatus according to one of Claims 6 to 23, characterized in that the press rolls (3, 6) are constructed of rubber or polyurethane, at least at their roll surface (3A, 6A).
26. Apparatus according to one of Claims 6 to 25, characterized in that the press rolls (3, 6) are provided with an anti-adhesion covering with a comparatively small coefficient of friction, at least at their roll surface (3A, 6A).
27. Apparatus according to Claim 26, characterized in that the anti-adhesion covering consists of a material based on polytetrafluoroethylene (PTFE).
28. Apparatus according to one of Claims 6 to 27, characterized in that the running speed of the press rolls (3, 6) corresponds to the passage speed of the web (7) in the press nip.
29. Apparatus according to one of Claims 6 to 28, characterized in that the press rolls (3, 6) are provided with a heating device (24, 24'), at least for heating the roll surface (3A, 6A).
30. Apparatus according to one of Claims 6 to 29, characterized in that in each case a cleaning device (21, 21') is assigned to the press rolls (3, 6) on a circumferential section of their roll surface (3A, 6A).
31. Apparatus according to Claim 30, characterized in that the cleaning device (21, 21') comprises a scraper blade (23, 23').

Images