WO2009062460A2

WO2009062460A2 - Slot die and installation for coating with thermoplastic coating material

Info

Publication number: WO2009062460A2
Application number: PCT/DE2008/001695
Authority: WO
Inventors: Kor Offrein
Original assignee: Lindauer Dornier Gesellschaft Mbh
Priority date: 2007-11-15
Filing date: 2008-10-16
Publication date: 2009-05-22
Also published as: DE102007056121B3; WO2009062460A3

Abstract

The invention relates to a slot die (14) and an installation (1) for coating a moving web of material (2) with thermoplastic coating material (3). The slot die (14) has two die bodies (70, 71), which can be displaced and/or pivoted in relation to each other by means of a drive (73). As a result, the width (78) of the die gap (77) is adjustable. The discharge of coating material (3) from the slot die (14) can be shut off by means of structures (82) in the die channel (72). A preferred application for the installation (1) in which the slot die (14) is used is the coating of unfinished carpet or synthetic grass (4) with thermoplastic adhesive (hot melt).

Description

WIDE SLIDE NOZZLE AND SYSTEM FOR COATING THERMOPLASTIC

COATING MATERIALS

The invention relates to a slot die for the application of thermoplastic

Coating material on a moving material web relative to the slot die and a system for coating a material web with a thermoplastic coating material with such a slot die.

Under slot dies are nozzles for the discharge of fluids to understand the nozzle orifice has a non-round, usually rectangular cross section, wherein one of the side lengths of the rectangle is substantially larger than the other. The nozzle orifice thus has the shape of an elongated "wide" slot from which emerges a suitably shaped fluid.

For the coating of material webs moved relative to the sheet die, the sheet die is arranged with its long side transversely to the direction of movement of the material web; Accordingly, the dimension of the slot die in this direction will hereinafter be referred to as its "length." The dimension of the shorter side perpendicular thereto, which is parallel to the direction of movement, is hereinafter called "width".

Such slot dies and systems are known from the prior art. They are used, inter alia, in the production of carpets whose back is to provide a better connection of the pile with the carrier fabric and to increase the durability with a back coating. Artificial turf is also to be counted among the carpet-like material webs, since this too consists essentially of a carrier fabric and associated fiber-like ribbons, carrier webs and ribbons likewise being to be permanently connected. Relevant systems for coating and associated slot dies are described for example in DE 10341 399 A1 for carpets and in DE 10 2005 026 765 A1 and DE 41 36 44 C for the production of artificial turf.

This coating used to be made of latex, a rubbery material, while the pile was made of polymeric plastic fibers. As a result, there were problems with recycling because the two different materials are not common can be unlocked. More recently, polymer-based thermoplastic coating materials known by the generic name "hotmelt" and commercially available in a variety of compositions have been described in detail Such coating materials are described in greater detail in US 10 2005 026 765 A1 and WO 99/28557 A1.

In the construction of slot dies a two-part design is common, in which define a first and a second nozzle body between them a nozzle channel having a transversely to the intended direction of movement of the material web extending, elongated nozzle orifice. In the direction of movement of the material web, the width of the nozzle orifice is generally constant, so that a cross section results in the form of an elongated, rectangular slot. However, there are slot dies, in which the width of the nozzle orifice is adjustable, which usually happens by adjusting at least one of the nozzle body relative to the other nozzle body. Such slot dies are shown for example in DE 25 04 856 C3. However, the construction of thin sheets described therein is not suitable for the use of hot thermoplastic adhesive, since they could not withstand the stresses in this type of use.

Another way of adjusting the width of the nozzle orifice is described in JP 5-138078 A. Here, tongues are arranged in the nozzle orifice, which extend substantially in the flow direction of the coating material and which are displaceable transversely to the nozzle orifice. Hereby, the width of the nozzle orifice can be adjusted in sections, in order to achieve a uniform coating even under very different outflow conditions. However, this construction is not very robust, very complicated and thus prone to failure.

In US 4,876,982 a slot die is shown, on whose nozzle body a doctor blade is arranged, which is intended to smooth the upper back side of the applied adhesive, wherein different forms for the doctor blade are presented. In this type of slot die, the width of the die mouth is not adjustable, which does not allow their adaptation to various application conditions, such as desired thickness of the coating or type and viscosity of the coating material. In addition, none of the mentioned designs of slot dies allows the rapid and reliable shut off of the flow of coating material as needed. Other slot dies with adjustable lips for adjusting the slot width are known, for example, from JP 06 142 591 A and DE 101 18 631 A1. In the latter, moreover, a temperature-flow channel through which a fluid flows is described in at least one nozzle lip, which can be acted upon optionally with warm or cold water. This is intended to prevent caking of the coating material on the die lips or thermal deformation. However, measures to keep the temperature of the coating material constant at a high level are not described in DE 101 18 631 A1. The tempering channels are also located in the front of the lips, they are therefore not suitable for the purpose mentioned. DE 10 2004 004 153 A1 describes a slot die with two lips, in which a lip for adjusting the slot width adjustable and the other lip is pivotable and which is mounted tiltable on a total of a holder. As a result, an adjustment of the nozzle in relation to the material to be coated is possible.

US Pat. No. 4,688,516 relates to a slot die of complicated construction, in which an adjustable regulating gap is provided between a supply chamber for the coating material and the nozzle orifice. However, the nozzle orifice itself is not adjustable. US Pat. No. 4,606,752 B1 discloses slot dies with a fixed slot width, in which a rotating element arranged transversely to the flow of the coating material, here called dynamic flow inducer, is arranged in the region of the nozzle channel in one or both nozzle bodies. This component is intended to assist the flow of the coating material through the die gap. A similarity with the structures according to the invention in the nozzle channel is purely external.

The object of the invention is to provide a comparison with the prior art improved, flexibly usable slot die and a system for coating a web, with which in a reliable way the production of carpets or high-quality artificial grass, which are easy to recycle, is possible.

The solution to this problem is given in relation to the slot die by the totality of the features listed in claim 1 and in view of the further subtask - providing an improved system for coating a material web - by a system having the features of claim 18 and 20 respectively. The slot die according to the invention is used for the application of thermoplastic coating material (ie adhesive) on flat, planar substrates, which are preferably removed as a web of material from a supply roll and moved at substantially constant speed past the slot die. The slot die has two nozzle bodies which define between them a nozzle channel with a nozzle orifice elongated transversely to the direction of movement of the material web. The first and second nozzle bodies are movable relative to each other to vary the width of the nozzle channel. As the width of the nozzle channel is here and below always meant the extension in the direction of movement of the web. The perpendicular extent, ie the actual, eponymous "width" of the slot die, however, is referred to as the length.

According to the invention, the first and / or the second nozzle body are provided with a controllable drive which is designed to displace and / or to pivot the two nozzle bodies relative to each other. This first aspect of the solution according to the invention makes it possible to change the relative position of the two nozzle bodies in a variety of ways in order to make the nozzle geometry variable within wide limits. On the one hand, the area of the nozzle opening is thus to be changed, for example with regard to the width of the nozzle opening in the direction of movement of the material web or with respect to the respective distance of the first or the second nozzle body from the material web, which can be preset independently for each nozzle body. On the other hand, this partial solution makes it possible to realize the second aspect, namely to obstruct a closure of the nozzle channel against the passage of coating material. For this purpose, the first and / or the second nozzle body are provided on its inner side with a structure which closes the nozzle channel when the two nozzle bodies are shifted by the drive in a minimum distance from each other and / or pivoted. The minimum distance is defined here by the fact that the structures, which must of course extend over the entire length of the slot die, come into contact with each other or with the opposite inner side of the respective other nozzle body, whereby a passage of coating material into the nozzle channel is prevented ,

The corresponding position of the two nozzle body can be determined by the drive of the nozzle body. In the simplest case, this is only the parallel displacement of a nozzle body in Reference to the other, fixed nozzle body required. Upon movement of the nozzle body towards each other, the slot die closes, since in this way the structures or at least one structure comes into sealing contact with the opposing structure or inside of the other nozzle body. With opposite movement, the passage for the coating material opens. As a result, at the same time the width of the nozzle opening is determined. The same effect of closing and opening the slot die for the passage of coating material can also be achieved by pivoting a nozzle body with respect to the other nozzle body. By an appropriate arrangement of the pivot axis and thus the width of the nozzle orifice can be predetermined, analogous to a parallel displacement of the nozzle body.

In pure parallel displacement of the nozzle body, the width of the nozzle channel and the nozzle orifice are coupled to the width of the passage for the coating material, said passage forms the narrowest point. By additionally pivoting at least one nozzle body with respect to the other, it is possible according to the invention

Compensate restriction and the width of the passage for the coating material and the width of the nozzle orifice largely independently pretend. Thus, an adaptation of the working conditions of the slot die in relation to the specification of material flow and mouth width is possible in a wide range. This allows optimal adjustment of the slot die on coating materials with different

Material properties, such as viscosity or processing temperature, and the optimum speed of each material web in the coating.

In a preferred embodiment of the invention, the structures are formed as a bead, which can be arranged in one or both nozzle bodies. The bead or beads protrude from the remaining surface of the inside of the respective nozzle body. They extend substantially over the entire length of the associated nozzle body above the nozzle channel defining region, so that a passage of coating material can be reliably prevented. According to the invention, it is preferred to provide both nozzle bodies with a respective bead, the two beads lying at the same height and coming into contact with each other when closing the passage for the coating material.

It is within the scope of the invention to provide only one nozzle body with a structure and the other nozzle body either with a corresponding smooth wall or with a Complementary structure to provide, in the case of a bead so with a corresponding indentation. The structures of the first and the second nozzle body can also be offset from each other in height, which is here meant the distance from the nozzle orifice, be offset. In this constructive variant, when closing, one structure in each case comes into contact with a smooth region of the inside of the respective other nozzle body, so that two sealing regions lying one behind the other in the flow direction of the coating material are formed. In a further embodiment of the invention, the structures are designed in the manner of a labyrinth seal, with alternating webs or grooves, which engage in the closing of the passage for the coating material. For this purpose, the webs or grooves may preferably have a rectangular or triangular cross-section and extend in the longitudinal direction of the slot die.

In a preferred embodiment of the invention, the structures according to the invention in the form of a tube or rod are formed, which is inserted into the inside of the respective nozzle body. For this purpose, the inner side is preferably provided with a groove running in the longitudinal direction of the nozzle body into which the pipe or rod is embedded. The insertion of the pipe or rod is carried out either directly or via the interposition of an insert which carries the pipe or the rod, wherein retaining elements for fixing these components, for example from the outside of the nozzle body forth, are provided.

The nozzle channel, which is defined by the opposite inner sides of the two nozzle body, according to the invention has a varying width over its length in a non-linear manner. This is in contrast to the usual, substantially uniform or slightly wedge-shaped, course of the width of the nozzle channel according to the prior art. A concave formation of the lower regions of the first and second nozzle bodies delimiting the nozzle channel produces a "bulbous" nozzle channel which, viewed in the flow direction of the coating material, initially widens and then narrows again in the direction of the nozzle orifice In this case, the narrowest section of the nozzle channel, which defines the width of the nozzle orifice, adjoins this narrowest point, widening again the cross section between the nozzle bodies and having an approximately funnel-shaped, asymmetrical course.

The first nozzle body is according to the invention in the direction of movement of the web seen in front of the second nozzle body. The first nozzle body has preferred in his bottom, the material web adjacent area seen in cross-section rounded outer contour, which causes a gradual approach and guidance of the web to the nozzle orifice of the slot die. In the region of the nozzle orifice, the outer contour merges with a small radius into the preferably concave inner side of the first nozzle body. In the working position of the slot die, it is advantageous to bring the outer contour of the first nozzle body into contact with the material web to be coated. However, this is not absolutely necessary, and a small distance between the material web and the nearest part of the first nozzle body is permissible in some cases.

The second nozzle body preferably extends in cross section from the narrowest point of the nozzle orifice to the outside in an arc such that the distance between the second nozzle body and the material web continuously decreases in the direction of movement and in the working position of the slot die touches the material web or comes closest to it , As a result, an area narrowing in a funnel-like manner towards the material web is formed, which on the one hand creates a relatively wide contact area of the coating material under pressure in the nozzle orifice with the material web and, on the other hand, allows the lower area of the second nozzle body to function as a doctor. The outflow region of the nozzle orifice according to the invention, or more precisely of the second nozzle body, thus serves to smooth the outside of the coating and to further press the coating material into the material web. The last-mentioned function can be supported and promoted by a counter-pressure roller or by a nozzle arrangement which blows compressed air from the underside of the material web against it.

According to the invention, the respective inner sides of the first and second nozzle bodies are provided with a coating which reduces the wall friction of the molten thermoplastic coating material. The material for the coating of the nozzle body must be able to withstand the usual high temperatures in the processing of thermoplastic adhesive, in special composition called "hot melt", and must not undergo chemical reactions with the coating material Such a coating promotes the flow of coating material through the nozzle channel and prevents the formation of turbulence in the nozzle channel, which adversely affects the uniformity of the coating of the web.These turbulences are a consequence of the relatively high viscosity and the consequent high Reynolds number of Coating materials to be used according to the invention. The coating of the inner sides of the nozzle body with the mentioned material preferably extends to the area of the structures according to the invention and to the adjoining nozzle channel, but it can also extend to the storage chamber located above these areas, at least in the transition to the structures.

In a particularly preferred embodiment of the invention, the first and the second nozzle body can be heated. This measure serves to keep the coating material always at a temperature which is optimal for processing. For every type of thermoplastic hot-melt adhesive (hotmelt) there is an optimal, relatively narrow temperature range at which it is to be processed. These areas, depending on the composition of the melt adhesive is between about 80 ⁰ C and 200 ° C wherein the respective optimum comprises only a few degrees. In this area, the hot melt adhesive in question, inter alia, a particularly favorable viscosity, also the tendency for thermal decomposition or oxidation is still low.

The heating of the nozzle body is carried out by any suitable method. Preference is given to the use of circulating thermal oil, which is guided through channels extending in the longitudinal direction of the nozzle body and brought to the required temperature via a heating device. As a result, the dangers that could occur in direct electrical heating of the metallic nozzle body avoided. Thermal oil has a relatively low vapor pressure even at the temperatures in question, which simplifies handling.

Of course, other types of heating of the nozzle bodies, such as directly with electricity via insulated heating elements or other heat transfer media are also within the scope of the invention. For adjusting and regulating the temperature, a preferably programmable control device is provided which cooperates with thermocouples in or on the nozzle bodies and the respective heating device. In this case, the control device is preferably integrated in the general control device for the operation of a system for coating material webs.

Of course, all containers, pipes and fittings that are filled with molten coating material or are flowed through by it, well insulated. she are preferably integrated into the heating system of the slot dies or the entire system for coating. For this purpose, the control device of the system is designed accordingly, and the objects to be heated are equipped with heaters, temperature sensors, etc., as already explained in relation to the slot die.

In a further embodiment of the invention, the two nozzle bodies are configured in the region lying in front of the structures and the nozzle channel in the flow direction of the coating material such that they form the longitudinal sides of a storage chamber for the coating material. This chamber has on one side devices for their supply of coating material, ie molten thermoplastic adhesive (hot melt), on, for. B. consist of one or more pipes that are fed by metering pumps. The lower part of the storage chamber opens via the structures according to the invention closes and apparently in the associated nozzle channel. The side walls of the storage chamber are formed by the corresponding areas of the nozzle body, a lid and end walls at the longitudinal ends of the nozzle body. The individual components of the storage chamber are in this case constructed and assembled so that they form a loadable with a pressure chamber for the coating material. For this purpose, the chamber is provided with suitable components, such as bushings, seals, etc., which allow the nozzle body or bodies to be displaced or pivoted in the manner according to the invention, without causing pressure reduction or leakage

Coating material comes in undesirable places. Such constructions are known to the person skilled in the art, so that further intervention is unnecessary therefor.

The loading of the storage chamber with the pressure that is required for the desired exit of the coating material from the nozzle orifice and the penetration into the material web to be coated, takes place in an expedient manner via the metering pumps used for feeding the storage chamber. For this purpose, the metering pumps or their motors are controlled by a preferably programmable controller, which controls the signals from flow meters in the supply line to the storage chamber and from pressure measuring cans which detect the pressure in the storage chamber. As a result, a specifiable pressure in the storage chamber, and thus the flow of material from the slot die, eiπstell- and adjustable. The metering pumps are preferably connected by means of short pipes to the storage chambers of the slot dies. In an embodiment of the invention, it is expedient to provide the storage chambers with return lines, which allow to lead the coating material from the storage chambers back to a buffer tank or to the reservoir for the coating material. This can be at the end of

Coating with a given coating material, this almost completely removed from the storage chambers before a new coating material is used. The emptying of the pantries is also beneficial for the performance of maintenance.

It is understood that all pipes, valves, containers or other fittings that come into contact with or flow through the molten material are well insulated. In addition, they are preferably configured to be heatable, wherein the temperature control takes place via the general control device.

The controllable drive for the displacement or pivoting of the nozzle body advantageously comprises at least one rotatably mounted camshaft whose eccentric cam preferably engages an outer side of a displaceably and / or pivotably mounted nozzle body. As a result, the inventive relative movement of the nozzle body can be accomplished in a sensitive and simple way. In particular, it is possible to achieve a rapid closure of the storage chamber to the nozzle channel, since this only a rotation of the camshaft by a certain angular amount is necessary to achieve a press contact between the structures on the inside of the two nozzle body. If only one nozzle body is provided with a structure, the press contact results with the opposite inner side of the other nozzle body.

Alternatively or in addition to a drive with a camshaft, the displacement or pivoting of the nozzle body or bodies can also take place with a hydraulically actuable arrangement. Such an arrangement preferably comprises at least one hydraulic cylinder, which acts via a piston with a push rod on the nozzle body to be moved.

In this case, it is within the scope of the invention to associate a separate drive arrangement with different components of the movement: such as an arrangement for a linear displacement along an axis and a further arrangement for pivoting about an axis of rotation. It is understood that at the great length of the slot dies, in practice may be several meters, several individual drive assemblies should be used distributed over the length. Of course, the drive assemblies must be sufficiently robust and sturdily constructed to withstand the forces of the pressurized coating material in the slot die.

The slot die according to the invention is used according to a further aspect of the invention in a system for coating a material web with a thermoplastic coating material. The plant according to the invention is equipped for this purpose in various ways to bring the benefits and specifics of the slot die according to the invention to fruition.

According to one aspect of the invention, a nozzle arrangement is arranged on that side of the material web which faces away from the slot die, that is to say the underside thereof, and specifically opposite the nozzle opening. This nozzle arrangement acts in the manner of a counter-pressure roller by blowing compressed air against the material web from below, with the result that the coating material brought up from the other side of the material web distributes itself better and more uniformly in the material web. In particular, it is prevented that the coating material exits on the underside of the material web or penetrates too deeply into the interior of the material web.

The nozzle arrangement according to the invention consists for example of a longitudinally slotted tube with an air outlet channel directed towards the material web and is supplied with compressed air via a connection with pressure regulation. It is preferably arranged in an aspiration chamber which is open towards the material web and which allows the amount of air supplied via the air outlet channel to be extracted. This suction is expediently with

Sealing lips provided, which are arranged closely adjacent to the air outlet channel parallel to the pipe. The sealing lips bound the extracted area and can also serve to further support the web in the region of the nozzle mouth of the slot die and the nozzle assembly.

In the coating of particularly wide material webs, which can extend over several meters, the invention provides to divide the slot die according to the invention into several subregions or sections, which are each supplied separately with coating material. The width of the individual sections is for example in the range of approximately one meter, so that five sections are provided with a total width of the web of, for example, five meters.

The individual sections are each equipped with their own dosing pump, a flowmeter and all other components and controls required for proper operation. For several sections of the slot die, the use of a buffer tank between the storage tank of the plant and the storage chambers of the individual sections is advantageous. The buffer container is preferably provided with a return line, which allows to completely return the coating material from the buffer container into the storage container. This is an advantage if the system requires maintenance or if the type of coating material to be used is to be changed. The buffer container is conveniently heated so that the coating material is always maintained at the optimum desired temperature. For this purpose, the already described devices and controls for heating the slot dies can be used. The return line to the storage container can also be used to circulate the coating material between the buffer container and the storage container, for which purpose a circulating pump in the return line is used. This also allows a favorable temperature of the buffer tank can be achieved. In an embodiment of the invention, the storage chamber of the slot die is also provided with a return line to the buffer tank or preferably to the reservoir for the coating material. This can ensure that all coating material in the reservoir of the system is traceable when production, such as maintenance, is interrupted.

In a further embodiment of the invention, the slot die is mounted on a nozzle suspension above the material web. The nozzle suspension is provided with a drive which allows the slot die to be displaced at least vertically up and down with respect to the material web moved substantially in a horizontal plane. Thus, the vertical distance between the slot die and the web and any desired contact pressure of the slot die can be adjusted to the web. Additionally or alternatively, the drive according to the invention can also cause a movement of the slot die back and forth in relation to the direction of movement of the material web. The system according to the invention for coating a material web is preferably equipped with a programmable control device which makes it possible to control and / or regulate all or at least certain functions and parameters of the system in a flexible and freely selectable manner. Such functions are, for example, the control of the drives of Düsenπkörper to open or close the nozzle channel, the setting of the width of the nozzle orifice, the speed of movement of the web or the control of metering pumps. The parameters to be controlled or regulated include, for example, the flow rate of the coating material, its pressure and temperature.

The coating materials to be used according to the invention, generally known by the name "hotmelt", have a density in the range of about 0.8 to 0.95 g / cm ^3. The application amount is typically about 0.5 to 1 kg / m ² 0.5 to 1 mm thickness of the coating material The temperature of the coating material exiting the nozzle orifice is about 180 to 200 ^° C., preferably 190 ^° C., and its

Outflow velocity is about 4 to 15 m / min. This range corresponds essentially to the transport speed of the material web to be coated. In the dimensioning of the slot die, it has proved to be advantageous if the width of the nozzle orifice, which is defined as the width of the narrowest region of the nozzle channel, is approximately one quarter of the length of the nozzle channel in the direction of flow of the coating material. The optimum value in each case depends on the composition of the coating material and accordingly varies with the specific formulation. Typical values for the width of the nozzle orifice are approximately 0.5 to 1 mm. The adjoining the narrowest region of the nozzle orifice, the convex portion of the second nozzle body extends over several millimeters, typically 4-10 mm, said nozzle body in the operating position at the end of this area has the smallest distance to the material web.

Experiments have shown that problems with friction effects can occur if the nozzle channel is too short or too narrow. These cause the flow of the molten coating material to rapidly change from a laminar to a turbulent state, which leads to an unclean, uneven application of the coating. When starting up the nozzle, the nozzle orifice should be much wider than required for the subsequent coating. As a result, the structure of a laminar flow is promoted. As a suitable value, about 3 mm have been found for the width of the nozzle orifice to the first filling of the nozzle channel. This width is then quickly brought to the required value of 0.6 - 1 mm for the actual coating. The initially resulting waste is thereby kept low.

Further details and advantages of the invention will become apparent from the embodiments. The invention will be described in more detail below with reference to the figures. Show it:

Figure 1 is a schematic representation of a system according to the invention for coating artificial turf raw material with thermoplastic adhesive.

Fig. 2 shows the basic structure of artificial turf, which can be produced with a system according to the invention;

3 shows in FIG. 3a a schematic cross section of a slot die according to the invention in the closed state and in FIG. 3b the nozzle of FIG. 3a in the opened state for carrying out a coating;

4 shows a slot die according to the invention according to FIG. 3 in use with a nozzle arrangement; FIG.

5 shows a schematic representation of the structure of a system for supplying the slot dies with thermoplastic adhesive / hotmelt;

Fig. 6 is a simplified version of the system of Fig. 5; and

7 is a schematic representation of an artificial turf coating system with a hotmelt supply according to FIG. 6.

1 shows a plant 1 for coating flat substrates, here in the form of a material web 2, with a thermoplastic adhesive as a coating material 3 is shown schematically. The material web 2 is made of artificial turf raw material 4, from a supply roll. 5 is guided on a Abhaspler 6 with adjustable speed in the system. The material web 2 passes over transport and deflection rollers 7, 7a and 8, 8a and via a voltage regulator 9 to a receiving device 10 at the beginning of the actual coating line. This receiving device 10 is provided with a spreader roller 11, which feeds the material web 2 in a constant width of the coating.

Above the material web 2 carried by support rollers 13, 13a, the wide-slot nozzle 14 according to the invention is arranged in the nozzle suspension 15. This is provided with a plurality of drives 16, by means of which the slot die 14 in the z-direction 18, ie vertically to the material web 2 to or away from it, and in the x-direction 17, along the material web, is adjustable. Particular drives 73 (not shown here) allow, according to the invention, parts of the slot die 14, namely the nozzle bodies 70, 71, to be displaced relative to one another and / or pivoted to one another. This will be discussed in more detail with reference to FIG. These drives 73 are preferably arranged on the nozzle suspension 15.

The slot die 14 extends across the entire width of the web 2 and preferably consists of a plurality of contiguous segments which are each separated, i. be supplied via its own supply lines with the thermoplastic hot melt adhesive as coating material 3. It is understood that the pressures, temperatures and other parameters of the nozzle segments, each individually specifiable and controllable. However, this is not shown in Fig. 1. Rather, in order to maintain clarity, only a melt preparation 25 with a container 26 and a pipe 27 leading to the slot die 14 is shown. Details of the melt preparation and the supply of the slot die 14 with the coating material will be explained in more detail with reference to FIGS. 5 and 6.

Seen before and behind the slot die 14 in the transport direction of the web 2 and expediently distributed to several across the width of the web, temperature sensors 20, 20a are arranged. These make it possible to detect the temperature conditions on the material web and to supply it to a control device as required. This makes it possible to better control and influence the coating conditions, for example with regard to the further application of cover layers 30 to the back side 65 of the material web 2 or to the process control for achieving an optimum result of the coating. To influence the temperature of the material web 2 and heated rollers 19 may be used be, these rollers 19 may also have another function, such as a support roller 13 or as a transport roller 7.

The molten, thermoplastic adhesive, usually referred to as "hotmelt", is applied to the material web 2 as a coating material 3 and penetrates into it, as will be described in detail with reference to Figure 2. The wide-slit nozzle 14 according to the invention acts on the ground Their special shape in the area of their mouth as a squeegee and thus ensures a clean and even distribution of the coating material and for sufficient penetration into the interior of the web.A separate squeegee in this area is therefore not necessary on the underside of the web can The arrangement of one or more support rollers may be advantageous in the region of the slot die These support rollers 13 may be arranged directly underneath or on both sides of the nozzle mouth, as shown in Fig. 3. These support rollers 13, not shown in Fig. 1, take the Forces that under Pressure exiting the slot die 14 exiting coating material 3 on the web 2. This controllable pressure is required to ensure a sufficient penetration of the viscous, molten adhesive into the material web 2.

After application of the molten, thermoplastic coating material 3, the material web 2 is carried by a needle chain 12 - in a further coating station 28. This is used to apply a cover layer 30 to the web 2 for producing a double back 31, the bottom of the finished product strengthens and protects. For this purpose, the supplied from a supply roll, not shown cover layer 30 of a application device 32 is supplied, for example, a height-adjustable in the direction of the double arrow 34 roller 33 for deflecting the

Cover layer 30 contains. The cover layer 30 is pressed by means of a pressure blade 35 on the back 65 (here the upper side) of the web 2, where it comes into contact with the still partially liquid and thus adhesive coating material. The pressing blade ensures intimate contact of the cover layer 30 and the adhesive-coated material web 2, which becomes a permanent connection by cooling the now finished product, in this case the synthetic turf 60, in an air cooling system 40.

The air cooling 40, which extends above the needle chain and thus the material web, has a distribution chamber 41 at the bottom of a nozzle assembly 42 on the Material web is directed. The supply of cold air via a compressed air line 43 or via its own fan 44. Other types of cooling such as water or other cooling media at this point are also possible.

In a Entnadeleinrichtung 45, the material web 2, here already as a finished artificial turf

60 is present, separated from the needle chain 12 and supplied to a wide cooling means of the cooling roller 46. The cooling roll 46 is cooled by a cooling circuit 47 comprising a plurality of heat exchangers 48 and 48a, pipes and a circulating pump 50 for the cooling medium. As a cooling medium water is advantageously used in the cooling circuit 47 through the cooling roller 46, wherein the temperature of the cooling medium via the heat exchanger 33 a and a separate cooling unit, not shown, can be regulated. By means of the cooling roller of the artificial turf 60 is cooled substantially to the ambient temperature, whereby the thermoplastic adhesive solidifies and reaches its final strength.

After leaving the chill roll 46, the artificial turf runs over a guide roller 8a to a rewinder 55, where it is wound on a reeling cylinder to form a reel 57. Upon reaching the target thickness of the roll of artificial turf 60 is a cutting of the artificial turf and a roll change in usually, which is not shown in Fig. 1 is not specific, but belongs to the usual equipment of relevant coating equipment.

The control of the system via a programmable controller 158, which is indicated only schematically in Fig. 1. The control device is connected via lines, not shown, with all drives, other units and sensors that are required for the operation and the control of the system 1. Parts of the control device 158 may also be arranged in a decentralized manner, such as the control 157 of the supply of

Coating material 3 to the storage chamber 90 of the slot die 14, as shown in Fig. 6.

Fig. 2 shows a schematic representation of the structure of an artificial turf 60, as he can be produced with the slot die according to the invention in a plant 1 according to the invention.

Starting material is an artificial turf raw material 4, for example, from a carrier fabric

61 and ribbon 62 made of a usually green colored plastic material. The grass blades or leaves of the lawn corresponding ribbon 62 are with their one Ends, the ribbon poles 63, attached to the carrier fabric 61, but not yet in a resilient manner.

To produce the synthetic turf 60, the ribbon poles 63 must be permanently and resiliently connected to the carrier fabric 61, which is done by applying a coating of a thermoplastic adhesive as the coating material 3. The coating material, for which the term "hotmelt" is customary, is applied in the molten state at a temperature in the range between approximately 150 ^° C. and 200 ^° C. from the rear side 65 of the material web 2 and partially penetrates the latter 63 and the carrier fabric 61 together in a layer of

Coating material 3 embedded and permanently and safely connected with each other later cooling.

The back 65 of the web can still be provided with a cover layer 30 of textile or plastic material, whereby an artificial turf 60 with double backs 31 is formed. This is done within the scope of the invention as long as the thermoplastic adhesive is still hot and thus adhesive, ie immediately after the coating by means of the slot die. By the cover layer, the back 65 of the synthetic turf 60, which comes to rest on the ground, reinforced and protected against injury and abrasion. In addition, the entire artificial turf 60 becomes more robust and resilient.

Fig. 3a shows a partially schematic representation of a cross section through a slot die 14 according to the invention. The slot die 14 has a first nozzle body 70 and a second nozzle body 71 which are spaced from each other by a nozzle suspension (FIG. 1), not shown, and extend longitudinally across the web substantially across its entire width or at least longer portions thereof , The mutually facing inner sides 80, 80a of the two nozzle bodies 70, 71 delimit in their upper, concave area a storage chamber 90 for the coating material 3, the molten, hot thermoplastic adhesive or the "hotmelt." The storage chamber is under an adjustable and controllable Pressure, which can be detected by pressure cells 149, not shown here, and fed to a controller 157. Via the controller 157 are suitable units for generating and maintaining the pressure required for the coating can be controlled, such as the metering pumps 147, also not shown here. Details of this are shown in FIGS. 5 and 6.

Below the storage chamber 90 is located in a region 81, a structure 82, the closure of the storage chamber 90 downwards toward the mouth of the

Slot die 14, serves. This structure 82 consists here of a respective bead 84, which protrudes from the otherwise smooth inner side 80, 80 a of each nozzle body. In the closed state of the slot die shown in FIG. 3 a, the opposing beads 84 touch and thus block the exit of coating material 3 into the nozzle channel 72 and thus to the nozzle opening and to the material web 2 to be coated.

According to FIGS. 3 and 4, the beads 84 are located in an insert 86, which is arranged in a region 81 of the inner side 80, 80 a of the respective nozzle body 70 or 71. In this area 81, a longitudinal groove 89 extending in the longitudinal direction of the nozzle body 70, 71 is formed, into which the insert 86 is inserted. The beads 84 may be integral with the insert 86, or as shown in FIGS. 3 and 4, as separate components. In this preferred variant, the beads 84 are part of a tube 87 or bar 88 which is recessed into the insert and protrudes partially over the surface thereof. The material for this, if it is not already made of metal, must be smooth, mechanically stable, but elastic and heat-resistant. Teflon (PTFE) is particularly suitable for this purpose and can also be used for

Coating the inner sides 80, 80 a of the nozzle body 70, 71 are used. Such a coating 96 is indicated for the inserts 86. It may advantageously also extend to the region of the nozzle channel 72.

To achieve the closed state of the storage chamber, a drive 73 is used, which allows one or both nozzle bodies 70, 71 to be displaced or pivoted so that they reach the closed position shown. Shown in Fig. 3a is such a drive 73 only for the first nozzle body 70 and also only schematically. It consists for example of a push rod 74 which engages via a bearing 75 pivotally mounted on the respective nozzle body 70, 71 and which is moved via a hydraulic cylinder 76. Of course, any other type of drive is also suitable for the movement of the nozzle body, provided that it can handle the high pressures that occur in the storage chamber 90 and in the nozzle channel 72. The drive must at least be able to press the two beads 84 together so strongly that the pressurized storage chamber is reliably closed. The actuator 73 for adjusting the relative position of the two nozzle bodies 70, 71 to one another is constructed such that it permits at least one nozzle body 70 and / or 71, whose relative, rectilinear displacement parallel to the other nozzle body 71 or 70 and perpendicular thereto. In this way, on the one hand, the distance of each nozzle body 70, 71 separated from the material web 2 adjustable to the other is the distance between the two nozzle body 70, 71 in the sense of opening and closing the storage chamber 90 and the definition of the width 78 of the nozzle orifice 77 determinable. It is particularly favorable if at least one nozzle body is still pivotably mounted and movable in an angular range, since this makes it possible to individually adjust both the opening and closing of the storage chamber 90 and the width 78 of the nozzle orifice 77. The abovementioned drives 73 and adjustment possibilities preferably act on the nozzle body 70 situated upstream in relation to the transport direction of the material web 2 (in the figures, the left), as shown in FIGS. 3 and 4. The general spacing of the slot die 14 from the material web 2 can then be fixed in the z-direction 18 via the drive 16 arranged on the nozzle suspension 15.

Subsequent to the insert 86 with the respective beads 84, the nozzle channel 72 begins, which is bounded by the concave inner sides 80, 80a and leads to the nozzle orifice 77, at which the coating material leaves the slot die 14. The width 78 of the nozzle orifice, as already mentioned, can be fixed via the drive or drives 73, preferably independently of the opening or closing of the storage chamber 90. The special bulbous shape of the nozzle channel 72 causes turbulence due to the relatively high viscosity of the coating material can be caused prevented or at least mitigated. This leads to a uniform exit of the coating material 3 from the Düsenmünduπg 77 and thus to a high quality coating without irregularities in the surface.

In the area of the nozzle orifice 77, the two nozzle bodies 70 and 71 are designed differently from each other. The upstream with respect to the transport direction 79 of the web 2, first nozzle body 70 has a convex Außenkoπtur, in which the material web - at the bottom of one or more support rollers 13, 13a and / or the needle chain 12 out - as in a (halved ) Funnel enters. In the further course of the first nozzle body is rounded with a small radius before it goes into the inside 80 and the nozzle mouth 77 limited on one side. The other, second nozzle body 71 extends from its inner side 80a in the region of the nozzle orifice 77 substantially convexly rounded outwards, as shown in FIGS. 3 and 4.

In Fig. 3b, the slot die of Fig. 3a is shown in the open state. In this

Drawing is located on the left side here first nozzle body 70 by means of the drive 73 perpendicular to the second nozzle body 71 of this moved, whereby the beads 84 are away from each other. As a result, the connection from the storage chamber 90 to the nozzle channel 72 is released and the coating material 3 under pressure in the storage chamber 90 can enter the nozzle channel 72. From the nozzle orifice 77, it exits and passes through the material web 2 conveyed underneath in the transport direction at a substantially constant speed.

The convex portion of the second nozzle body 71 in this case has the function of a doctor blade, which assists the penetration of the hot, molten coating material 3 and ensures a uniformly thick application and a smooth surface of the coating. It should be noted that the area of the coating material 3 directly in contact with the material web 2 is significantly wider than the width 78 of the nozzle orifice 77, this width 78 being the narrowest distance between the first and second nozzle bodies 70 and 71 in this area is defined.

The two nozzle bodies 70, 71 are preferably provided according to the invention each with a heater 100, both the area of the storage chamber 90, and the region of the nozzle channel 72. The heating takes place for example via thermal oil or another temperature-resistant medium with low vapor pressure in the area of up to 200 ⁰ C, which is circulated in channels 101 and brought to the required temperature via a temperature control device, not shown here. Alternatively, an electric heating can be used, of course, to ensure sufficient electrical insulation. The nozzle bodies are equipped for temperature monitoring with temperature sensors, not shown here. The two regions of the nozzle bodies 70, 71 can thus be brought and held via the heater 100 to the optimum processing temperature for the coating material 3 used in each case. This ensures optimum process control and a high quality and even coating. FIG. 4 shows, in a schematic illustration, a slot die 14 according to the invention in accordance with the exemplary embodiment already shown and described with reference to FIG. 3a. In FIG. 4, the nozzle arrangement 105 arranged beneath the material web 3, which lies opposite the material in the region of the nozzle orifice 77, should be emphasized. The generally formed as a slot nozzle 106 from a longitudinally slotted tube 107 with an outlet channel 108 and transverse to the web 2, and thus parallel to the slot die 14, arranged nozzle assembly 105 blows compressed air from below against the material web 3. Thus, it captures the pressure of the Nozzle mouth 77 exiting coating material 3 on. To reduce the overpressure generated by the nozzle assembly on the underside of the web 2 and to prevent the blowing of the

Coating material 3 by the compressed air is the slot nozzle 106 in one of the material web, i. here upwards, open chamber 110 arranged. The chamber 110 is connected to an exhaust 111 and has two supports in the form of Seitenwäπde 112, which are provided with sealing lips 113, and come into contact with the underside of the web 2. In this way, a limitation of the suction zone and an additional support of the material web 2 in the region of the slot die 14 is achieved.

5 shows a schematic representation of a system for supplying a slot die 14 according to the invention with a thermoplastic adhesive of the "hot melt" type as coating material 3. This plant is a detailed representation of the in Fig. 1 only flat as .Schmelzeaufbereitung 26 "designated and with To see a container 26 shown part of Appendix 1. Shown in the upper part of FIG. 5 is a melt mixing plant 115 in which the coating material 3 is mixed and melted as a hotmelt from various starting materials delivered individually in containers, not shown.

As starting materials for the production of hot melt adhesive serve as main components polyolefins, in particular poly-alpha-olefins, resins and fillers, such as kaolin. These starting materials, whose respective mixing ratios determine the properties of the hot-melt adhesive, including its temperature behavior and thus its viscosity, are introduced into the mixing container 116 in the desired dosage, for which purpose a lockable filling lock 121 is provided. The mixing tank 116 is designed as a double-wall boiler 117, with a pressure-tight lid 120 and an inlet 118 and an outlet 119. About this, the area between the two walls of the double-wall boiler 117 can be either evacuated, so that a kind of thermos formed which delays a cooling of the contents, or a heat transfer medium, such as thermal oil, can be passed through the inlet and outlet 118 and 119, respectively, to bring the boiler temperature to a desired value. Alternatively, in the interior of the double-walled boiler 117, a separate heating device, not shown here, may be arranged.

The mixing vessel 116 has an externally drivable mixing stirrer 123 to thoroughly mix the individual components of the charged starting material, and an agitator 124 for further mixing the hot melt adhesive in the molten state with sufficiently low viscosity. The temperature required for this, depending on the composition of the hot melt adhesive in the range of about 80 ⁰ C up to 200 ⁰ C. The heating of the mixing vessel 116 must therefore be able to hold this temperature permanently. The cover 120 of the mixing container 116 is expediently a further lockable connection, which serves as a protective gas inlet 122. For example, nitrogen can be introduced into the space above the melt via this connection, which promotes the stability of the melt.

On the underside of the mixing container 116, an outlet 125 is arranged with a closure 130, for example in the form of a gate valve, which is followed by a temperature-resistant feed pump 131 for the ready-mixed hot melt adhesive. In the further course are a pipe 132 and a flow meter 134.

The pipeline 132 opens into an upwardly open storage container 135 for the coating material 3, which was produced as a hot-melt adhesive in the mixing container 116. The reservoir 135 is also constructed as a double-walled kettle and, like the mixing bowl 116, is maintained at an adjustable, higher temperature via a dedicated heater, not shown here. The reservoir is equipped with a stirrer 137 to keep the melt contained in it in constant motion. This prevents possible segregation of the components, and the temperature distribution in the melt of the hot-melt adhesive is homogenized. The reservoir 135 may of course also be provided with a lid, which must then be provided with inlet for the melt from the mixing vessel 116 and inert gas or can. A removable lid is preferred in this case as well as the lid 120 of the mixing container 116. At the bottom of the reservoir 135 is analogous to the arrangement of the mixing vessel 116, a closure 138 and a pump 139 is provided, by means of which the liquid hot melt adhesive to a buffer tank 145 is conductive. The buffer container 145 has shut-off return lines 146, which allow hot-melt adhesive to be conveyed from the buffer container 145 back into the storage container 135 with the aid of delivery pumps (not shown). By means of the pump 139 in the feed to the buffer tank 145, a circulation of hot melt adhesive between reservoir 135 and buffer tank 145 can be generated.

From the buffer tank 145, a plurality of pipes 152 lead via shut-off valves 151 to a respective metering pump 147 driven by a motor 153 and from there through a further shut-off valve 151a and a flow meter 148 to a section 150 of the wide-slot nozzle 14. The individual pipes 152 each open into the Not shown here storage chambers 90 of the associated portion 150 of the slot die 14 and allow it to feed the storage chambers 90 with the hot melt adhesive melt as coating material 3. Adjacent storage chambers 90 are preferably separated from each other and each individually via the metering pumps or other suitable means, such as compressed gas, with an adjustable and controllable pressure acted upon. Under the effect of this working pressure, when the storage chamber 90 is open (see Fig. 3b), the coating material 3 flows through the nozzle channel 72 to the nozzle orifice 77 where it comes into contact with the material web 2 to be coated.

FIG. 6 shows a simplified version of a system for supplying the slot die 14 with hotmelt melt 156 as the coating material 3. In this version, ready-delivered hotmelt material of a specific composition in the double-walled storage container 135 is melted by means of a heater, not shown here, and kept at the temperature required for processing. An agitator 137 ensures a homogeneous temperature distribution and prevents possible segregation of the components of the hotmelt material. The molten hotmelt material, now as a hotmelt adhesive, is transferred from the storage container to the storage chamber 90 of the slot die 14 via a pipe 152 attached to the bottom of the storage container 135 by means of the metering pump 147 driven by a controllable motor 153. From the storage chamber, a return line 155 leads back into the storage tank 135. Via a separate shut-off tap 154 in the return line 155, the storage chamber 90 can be emptied if necessary or made pressure-free, for instance for maintenance purposes. FIG. 7 shows a further system 1 for coating a material web 2 with hotmelt melt 156 as coating material 3. The material web 2 is, as in the embodiment of FIG. 1, taken from a supply roll, not shown, and dancers and transport rollers 160 and 7 and a spreader roller 11 and guide rollers 8 which also serve as Stützwalzen13, the slot die 14 fed. The supply of the slot die 14 with hot melt melt 156 is carried out in this system according to the system shown in FIG. 6 and described for supplying the slot die 14. The coating material 3 is in this case delivered in a container 161 and transferred to the reservoir 135.

The further course of treatment of the material web 2 corresponds to the procedure shown and described in FIG. The reference numerals used in FIGS. 1 and 6 have been retained for corresponding parts of the system according to FIG. 7. Only the air cooling 40 from FIG. 1 has been replaced by a cooling zone 163 in FIG. 7. To avoid repetition, reference is made to the understanding of FIG. 7 to the corresponding embodiments in FIGS. 1 and 6.

Claims

claims

1. slot die (14) for the application of thermoplastic coating material (3) on a relative to the slot die (14) moving material web (2), with a first

Nozzle body (70) and a second nozzle body (71) defining therebetween a nozzle channel (72) with a nozzle orifice (77) elongated transversely to the direction of movement of the material web (2), the first nozzle body (70) and the second nozzle body (71 ) are movable relative to each other to change the width of the nozzle channel (72), wherein

- The first nozzle body (70) and the second nozzle body (71) via a controllable drive (73) are relatively displaceable and / or pivotable and - at least one of the first and the second nozzle body (70 and / or 71) in one the area (81) of their respective inner side (80, 80a) delimiting the nozzle channel (72) is / are provided with a structure (82) which in this area (81) forms the nozzle channel (72 ) for the passage of the coating material (3) blocks when the respective structure of the first and / or second nozzle body (70 and / or

71) is brought into contact with the corresponding structure (82) or the opposite inner side (80, 81) of the respective other nozzle body (70, 71).

2. slot die according to claim 1, characterized in that the structure (82) consists of a in the longitudinal direction of the associated nozzle body (70, 71) extending bead (84) is formed.

3. slot die according to claim 1 or 2, characterized in that the nozzle channel (72) defining the inside (80, 80 a) of the first and the second nozzle body

(70 and 71) is provided with a coating (96) which reduces the friction of the molten thermoplastic coating material (3).

4. slot die according to one or more of claims 1 to 3, characterized in that the first and the second nozzle body (70 and 71) are heatable.

5. slot die according to one or more of claims 1 to 4, characterized in that the structure (82) of a tube (87) or rod (88) is formed in the inside (80, 80 a) of the first and / or second nozzle body (70 and / or 71) is recessed and protrudes from this inner wall (80 and / or 80a).

6. slot die according to one or more of claims 1 to 5, characterized in that the first and second nozzle body (70 and 71) at their respective, the

Düsenkanal (72) bounding inside (80, 80a) are shaped such that the width of the nozzle channel (72) varies over its extent in the flow direction of the coating material (3).

7. slot die according to claim 6, characterized in that between the nozzle orifice (77) and the structure (82) lying areas of the first and second nozzle body (70 and 71) are concave at least in a partial section such that the nozzle channel ( 72) has a larger cross-section in this section than in its remaining course.

8. slot die according to one or more of the preceding claims, characterized in that the first nozzle body (70) with respect to the direction of movement of the material web (2) in front of the second nozzle body (71) is arranged and that the second nozzle body (71) in the Working position of the slot die (14) with its in the direction of movement of the web (2) front portion occupies a greater distance from the material web (2) as the first nozzle body (70).

9. slot die according to claim 8, characterized in that the distance of the second nozzle body (71) seen in the working position of the slot die (14) in the direction of movement of the material web (2) decreases.

10. slot die according to one or more of the preceding claims, characterized in that the nozzle orifice (77) adjacent regions of the first and the second nozzle body (71 and 72) are convexly rounded.

11. slot die according to one or more of the preceding claims, characterized in that the first and the second nozzle body (70 and 71) are formed in a subsequent to the structures (82) having subsequent portion such that between them an extended pantry (70 and 71) 90) for receiving coating material (3) is formed.

12. slot die according to claim 11, characterized in that the storage chamber (90) can be acted upon with pressure.

13. slot die according to one or more of the preceding claims, characterized in that the structure in the form of a labyrinth seal (91) is formed, engage in the corresponding, alternately arranged grooves (92) and / or webs (93).

14. slot die according to claim 13, characterized in that the flanks of the grooves (92) and / or webs (93) extend in the longitudinal direction of the nozzle body (70 and 71).

15. slot die according to claim 14, characterized in that the grooves (92) and / or webs (93) have a rectangular or a triangular cross-section.

16 slot die according to one or more of the preceding claims, characterized in that the controllable drive (73) of the first and second Düsenkör- pers (70, 71) comprises at least one rotatably mounted camshaft, by means of which at least one of the first and second nozzle body slidably or is pivotable.

17 slot die according to one or more of the preceding claims, characterized in that the controllable drive (73) of the first and second Düsenkör- pers (70, 71) at least one hydraulically actuable assembly (74, 75,76) comprises, at least a nozzle body (70 and / or 71) attacks.

18. System (1) for coating a material web (2) with a thermoplastic coating material (3) with a slot die according to one or more of preceding claims, characterized in that on the side facing away from the slot die (14) of the material web (2) a nozzle arrangement (105) is arranged, by means of which the material web (2) in the region of the mouth (77) of the slot die (14) with compressed air can be acted upon.

19. Plant according to claim 18, characterized in that the nozzle arrangement (105) in its inner region is associated with a material web (2) open towards the chamber (110) with a suction device (109) for air.

20. Plant according to the preamble of claim 18, characterized in that the slot die (14) along several subregions or portions (150), which are each supplied separately with the coating material (3).

21. Plant according to claim 20, characterized in that each section (150) is associated with its own pump as a metering pump (147) and its own flow meter (148) for the coating material (3).

22. Plant according to claim 21, characterized in that the supply of coating material (3) for all subregions or sections (150) from a buffer container (145), which is fed from a reservoir (135).

23. Plant according to claim 22, characterized in that the buffer container (145) is provided with at least one return line (146) to the reservoir (135).

24. Plant according to one or more of claims 18 to 21, characterized in that the first nozzle body (70) and the second nozzle body (71) are each provided with a heater (100) and a temperature control device.

25. Plant according to claim 24, characterized in that the first nozzle body (70) and the second nozzle body (71) each with channels extending in the longitudinal direction

(101) are provided, through which a fluid, in particular thermal oil, is circulated, whose temperature is adjustable.

26. Installation according to one or more of claims 18 to 25, characterized in that the slot die (14) via a drive (16) perpendicular to and / or in the longitudinal direction of the material web (2) is arranged displaceably.

27. Plant for coating a material web according to one or more of claims 18 to 26, characterized in that it has a programmable controller (157) which monitors the temperature of the Düsenπkörper (70, 71) and the pressure in the storage chamber (90) and controls and which controls the drives (16, 73) for adjusting the position of the slot die (14) relative to the material web (2) and a displacement and / or pivoting of the nozzle body (70, 71) relative to each other.

28. Plant for coating a material web according to claim 27, characterized in that at least one temperature sensor (20) in the vicinity of the slot die (14) above the material web (2) is arranged, which temperature sensor, the temperature of the web (2) or on ascertains this applied coating material (3) and transmits the temperature value (s) received to the controller (157).