EP1493496A1 - Coating apparatus and method - Google Patents

Abstract

A coating machine (10) comprising a coating tank (21) with an opening (22) and a coating roller (31), in which the roller (31) is opposite the opening (22). Independent claims are also included for (1) a method for coating a substrate with a fluid by applying the fluid to the substrate and then subjecting the fluid to a shearing force by moving the substrate relative to the fluid (2) substrates coated by this method.

Description

The subject of the invention is a new device and a new process for coating fluid, in particular fluid at the threshold of flow.

The term "coating" is applied to the application of a substance fluid or fluidized on a support or substrate and extension, the layer of the substance deposited as a coating herself. Adhesives such as reagents two-component polyurethanes (PU2K) are frequently used for coating substrates such as woven or knitted strips. Coating leads to a mechanical reinforcement of the substrate and know various applications, such as fixing weaving, shaving loops of the substrate or the cutting of the substrate.

We know standard glue rollers (x) with overflow and recycling, such as used for solvent-based PU2K adhesives. We know in addition to coating devices using a nozzle to lip, as practiced for HMPUR "Reactive Hot-Melt Polyurethanes"). Now, these devices give rise to frequent production stoppages due to for example, blockages and the need to purge and rinse the devices.

There is therefore a need for a device coating that solves the problems mentioned above.

The subject of the invention is a coating device comprising a coating pan with an opening and a coating roll, in which the roll is facing of the opening.

• un espace est ménagé entre le bac et le rouleau d'enduction, de préférence compris entre 0,1 et 7 mm ;
• au moins un tiroir coulisse dans le dispositif ;
• le dispositif comprend des moyens de rappel du bac d'enduction vers une position de fonctionnement ;
• le dispositif comprend au moins un rouleau de guidage du substrat avec, éventuellement, des galets de guidage ;
• le dispositif comprend des moyens de positionnement du rouleau de guidage selon un axe, éventuellement excentré par rapport à l'axe de rotation du rouleau de guidage ;
• le dispositif comprend en outre un four ;
• le dispositif comprend en outre un rouleau de bobinage du substrat.

In preferred embodiments, the invention comprises one or more of the following features:

• a space is provided between the tray and the coating roll, preferably between 0.1 and 7 mm;
• at least one drawer slides in the device;
• the device comprises return means of the coating tray to an operating position;
• the device comprises at least one guide roller of the substrate with, optionally, guide rollers;
• the device comprises means for positioning the guide roller along an axis, possibly eccentric with respect to the axis of rotation of the guide roller;
• the device further comprises an oven;
• the device further comprises a substrate winding roller.

The invention also relates to a coating process a substrate by a fluid comprising the steps of: (i) providing a substrate and a fluid, (ii) applying fluid on the substrate and (iii) fluid shear by the substrate set in motion relative to the fluid.

• le procédé comprend en outre une étape (iv) d'extension du substrat au moins partiellement concomitante avec l'étape de cisaillement du fluide ;
• le substrat fourni à l'étape (i) est un substrat maillé et l'étape (iv) est une étape d'extension des mailles du substrat ;
• les caractéristiques du fluide fourni comprennent au moment de l'étape (ii) : une viscosité Brookfield à 23°C comprise entre 100 et 200000 mPas, de préférence entre 200 et 4000 mPas, un seuil d'écoulement compris entre 1 et 5000 Pa, de préférence entre 10 et 500 Pa et un délai d'obtention de seuil d'écoulement ajusté entre 1 et 20 secondes, de préférence entre 2 et 10 secondes ;
• le fluide fourni est un adhésif réactif Polyuréthanne bi-composant, qui comprend une partie résine comprenant au moins un polyol et une polyamine, et une partie durcisseur comprenant au moins un isocyanate ;
• le procédé comprend en outre une étape (v) de chauffage du substrat ;
• le procédé comprend en outre une étape (vi) d'enroulement du substrat ;
• le procédé utilise un dispositif d'enduction selon l'invention.

In preferred embodiments, the invention also includes one or more of the following features:

• the method further comprises a step (iv) of extending the substrate at least partially concomitant with the fluid shearing step;
• the substrate provided in step (i) is a mesh substrate and step (iv) is a step of extending the mesh of the substrate;
• the characteristics of the fluid supplied comprise, at the time of step (ii): a Brookfield viscosity at 23 ° C. of between 100 and 200000 mPas, preferably between 200 and 4000 mPas, a yield point of between 1 and 5000 Pa, preferably between 10 and 500 Pa and a time to obtain adjusted flow threshold between 1 and 20 seconds, preferably between 2 and 10 seconds;
• the fluid supplied is a two-component polyurethane reactive adhesive, which comprises a resin part comprising at least one polyol and a polyamine, and a hardener part comprising at least one isocyanate;
• the method further comprises a step (v) of heating the substrate;
• the method further comprises a step (vi) of winding the substrate;
• the method uses a coating device according to the invention.

The invention also relates to a coated substrate obtainable by the coating process of a substrate according to the invention. In one embodiment preferred, the substrate is a self-gripping textile.

• Figure 1 : une vue en perspective d'un dispositif d'enduction selon l'invention ;
• Figure 2 : une vue de côté d'un dispositif d'enduction selon l'invention ;
• Figure 3 : une vue de dessus d'une partie d'un dispositif d'enduction selon l'invention ; et
• Figure 4 : une illustration schématique d'un substrat inséré dans un dispositif d'enduction selon l'invention, vu de profil.

Other features and advantages of the invention will appear on reading the following description of preferred embodiments of the invention, given by way of example and with reference to the appended drawings showing:

• Figure 1 is a perspective view of a coating device according to the invention;
• Figure 2 is a side view of a coating device according to the invention;
• Figure 3: a top view of a portion of a coating device according to the invention; and
• Figure 4: a schematic illustration of a substrate inserted into a coating device according to the invention, seen in profile.

The invention proposes a coating device comprising a coating pan, with an opening, and a coating roll, in which the roll is facing of the opening.

The coating pan is adapted to receive a substance to be coated on a substrate. The opening is dimension less than or equal to the roll surface in look at the bin. A fluid, for example a threshold adhesive flow, can be introduced into the coating tank. A substrate, for example a textile strip, can be inserted between the roll and the opening, the back of the substrate (that is, the side to be coated) facing the opening.

Under the influence of gravity or any means pressure of the appropriate fluid, the fluid comes apply on the substrate. When put in motion relative to the fluid, the substrate exerts a shear stress on a layer of the fluid, by example a lower horizontal layer when the fluid is applied to the substrate under the action of gravity. When the flow threshold fluid is subjected to a sufficient shear stress by the tape substrate, it can flow and then coat the substrate.

Such a device allows the coating of the strip with good penetration of the fluid into the substrate. The substrate can be simultaneously extended to level of the coating roll, which improves the fluid penetration. Using this device with a fluid having both a flow threshold and a rapid cohesion build also allows good penetration into the substrate, for example in the weft of a textile, without crossing it. He is in additionally possible to jointly adjust the speed drive band and physicochemical properties fluid to obtain precise control of weight of adhesive deposited and thus the properties of the suitable for various applications (fixing the weaving, shaving substrate loops, cutting longitudinal, cutting transverse to the cutter, butting by ultrasonic welding and fixation or stiffening of edges). In addition, the use of a coating roll gives better coating results than a device classic using a lip nozzle. In particular, obtained thanks to the invention a more tense coating and more brilliant.

Figure 1 shows a perspective view of an example coating device according to the invention, using the gravity as a means of applying the fluid to the substrate. The device 10 comprises a coating tank 21 delimited, in its upper part, by four flanks 26a, 26b, 26c, 26d. These flanks can advantageously be made of polytetrafluoroethylene, taking into account the chemical resistance, thermal stability and the low coefficient of friction of it. In his lower part, the tray 21 comprises an opening 22 formed by the flanges 27,28 of two other flanks 27a, 28a, which will be described with reference to Figures 2 and 3. Under its lower opening 22, the coating device 10 further comprises a coating roller 31 next to the opening 22, beneath it, and whose width is generally between 20 and 60 cm. The width of the roll is not, however, theoretically limited; it is in practice in view of the risks of mechanical deformation of the roll (buckling). The diameter of the roll is preferably less than 100 mm and more great preference between 30 and 50 mm.

With this device 10, an adhesive can be introduced into the coating tank 21 and a substrate strip 40 can be inserted between the roller 31 and the lower opening 22, through a space provided for this purpose and, if necessary , adapted to the thickness of the band (relief included). The space between the roller 31 and the lower opening 22 is typically between 0.1 and 7 mm, depending on the desired coating weight. For example, providing a space of about 5 mm, corresponding to a thickness of a substrate with its relief, provides a basis weight of between 50 and 5000 g / m ² , depending on the resistance to crushing of the relief. The face to be coated of the substrate 40 is placed on the side of the opening 22. Under the action of gravity, the adhesive is applied to all or part of the strip, the opening having dimensions less than or equal to those of the roll.

Such a device is particularly well adapted to the implementation of a process for coating a substrate with a fluid according to the invention. Such a fluid can, for for example, be a flow threshold fluid, preferably without solvent. The method according to the invention comprises steps of providing a substrate and a fluid; applying the fluid to the substrate; and of shearing of the fluid by the moving substrate relative to the fluid.

The method according to the invention therefore proposes to apply the fluid on a substrate and exert a stress of shear on this fluid. When the constraint of shear is enough to overcome the threshold flow of this fluid, it can flow and properly wet the substrate. When the constraint of shear becomes below the flow threshold (for example, when the stress ceases), the fluid does not no longer flows.

It is therefore possible to make a coating of a substrate, which properly wets this substrate without to cross it and this, by adjusting the stress of shear, its timing and that of the application of fluid.

The coating process according to the invention may furthermore include a step of extending the substrate 40 (i.e. an opening of the relief or meshes 42 of the substrate, where appropriate) at least partially concomitant with the shearing stage of the fluid, in order to improve the shearing of the fluid by the substrate as well as the penetration of the fluid into the substrate.

The device and the method according to the invention are well suited for use with a threshold fluid flow such as a fluid whose viscosity, measured at using a Brookfield standard viscometer at 23 ° C, is between 100 and 200000 mPas, preferably between 200 and 4000 mPas, with a flow threshold of between 1 and 5000 Pa, preferably between 10 and 500 Pa and a delay to obtain the adjusted flow threshold between 1 and 20 seconds, and preferably between 2 and 10 seconds. Such fluid profile allows easy pumping.

The fluid can both have a threshold of flow and Newtonian behavior once the threshold crossed, and stay perfectly suited for use with the device according to the invention. In fact, even if he is more particularly adapted to threshold fluids flow, the device according to the invention is also compatible with a wide range of fluids without threshold flow, that is to say having a threshold of less than 1 Pa, but having an appropriate viscosity between 100 and 200000 mPas.

In particular, the device and the method are particularly well suited for the application of a two-component polyurethane (PU2K) reactive adhesive, comprising a resin part comprising at least one polyol and a polyamine, and a hardener portion comprising at least minus one isocyanate. Such a reactive mixture is susceptible to present a threshold of flow. It can furthermore advantageously be used without solvent, that is to say having a solvent content of less than 1% and, preferably less than 500 ppm by weight, in the device according to the invention.

The drive of the substrate strip 40 around the roll 31 leads to shearing of the fluid by the substrate. Sufficient shear of an adhesive having a profile as described above increases the fluidity of this adhesive at the level of the lower opening, resulting in then a correct wetting of the fibers of the substrate.

The passage of the strip on the roller 31 may furthermore lead to an extension of the substrate 40 (i.e. opening of the relief or meshes 42 of the substrate, the case appropriate), coating face side. The importance of this extension varies in particular depending on the diameter of the roll 31 as well as angles formed by the substrate of roll 31: we will talk about angles of arrival and exhaust depending on whether one is downstream or upstream of the roller 31, respectively. This extension is at least partially concomitant with the shearing of the adhesive, which improves the wetting of fibers of the substrate by the adhesive.

In this respect, it should be noted that embodiment, the diameter of roll 31 of coating searched is as small as possible, in order to allow a maximum extension of the substrate 40, provided that diameter does not induce significant buckling of the roll. A roll diameter of between 30 and 50 mm allows optimize the extension of the substrate 40. In practice, a diameter of 40 mm is particularly suitable for the extension of substrates of various types. The extension of substrate 40 is resorbed just after the passage on the roll of coating 31 while the adhesive takes again the cohesion after shearing. The use of such device 10 with an adhesive having both a threshold flow and a rapid increase in cohesion improves the penetration of the fluid into the substrate without the to cross. The speed of drive of the band can in in addition to being adjusted (1 to 200 m / min, preferably 10 to 50 m / min) together with the physicochemical properties adhesive to allow precise weight control deposited adhesive, for example between 10 and 500 g / m2, according to the relief of the support. Such an adjustment makes it possible besides obtaining varied properties, depending on the application considered, such as fixing weaving, shaving loops of the substrate, the longitudinal cut or transverse to the paper cutter, welding ultrasound and fixation or stiffening of selvedges. The coating device according to the invention is furthermore particularly well suited for textile coating Velcro. In addition, the use of a roll coating 31 gives better coating results that a conventional device using a lip nozzle. In particular, we obtain through the invention a coating more tense and brighter. Moreover, the device 10 according to the invention does not give rise to stops of production, even when used with adhesives having a rapid cohesion build-up.

Other elements 32,32a, 32b, 34 of FIG. described with reference to FIG.

Figure 2 shows a side view of a device of coating 10 according to the invention. This view shows the flanges 27,28 flanks 27a, 28a, defining the opening 22 bottom of the tray 21, under which the roller is located 31. Flanks 27a, 28a may be inclined, so that the tray 21 has a funnel section, with an angle hopper adapted to facilitate the flow of fluid. However, another type of section, for example rectangular, could also be suitable.

It may also be advantageous to provide coating device 10 further comprising one or two flanks 27a, 28a movable. In particular, the flanks 27a, 28a can slide according to the arrows shown in the figure 2. It is thus possible to adjust the space between the tray and coating roll, depending on the thickness of substrate and / or together with properties physical and chemical properties of the adhesive, in order to obtain specific properties of the substrate strip 40 (see above).

In addition, it may be advantageous to provide coating device 10 in which the section of the ledges 27,28 is rounded tip-shaped at its end (the osculating circle at the end of a ledge a diameter typically between 0.5 and 15 mm), so to encourage the slipping of the band and to avoid any hitch with it when driven on the 31. The profile of the flanges 27, 28 of the example of device shown in Figure 2 results from a compromise between their machinability (the edges are in this example made of a metallic material) and the angle exhaust α sought. The angle corresponding to the tip, in section, is typically between 20 ° and 40 °. It may, however, be adapted so as to exhaust angle α greater than the wetting angle of the fluid to prevent the accumulation of fluid against a flange. This allows to extend the operating time continuous operation of the device before interruption for cleaning and, therefore, to decrease the frequency of production stop.

It is also advantageous to be able to slide at least one drawer 23,24 in the device 10. By example, it is possible to provide a passage 25 arranged in at least one flank 26 so as to be able to slide one or more drawer (s) 23,24 along the channel formed by the flanges 27,28 from the outside of the device 10 by means of drawer gripping means 23a, 24a. This possibility will be described with reference to FIG.

In addition, recall means 29 can be provided. coating tank 21 against the coating roll 31 via the edges 27,28 or against the band, when this one is inserted. However, where it is desirable to space between the tray 21 and the coating roll 31, these means 29 are adapted to recall the tray 21 to an operating position. This position of operation leaves a free space between the tray 21 and the 31. In the example shown on FIG. figure, the return means 29 comprise one or more coil springs. In this case, springs can to be in contact with the surfaces of the support 12, of a flat 14 and a sleeve 16. This sleeve can optionally be adjustable, that is to say it can be screwed on a rod 16a to adjust the return force of the spring. Mounting previous one also allows to adjust the position of operation of the tray 21 (including the height of the tray, the angles of pitch and roll), to dampen the vibrations of the system (for example when passing butt joints of the substrate band) and release constraints casualties engendered by the movement of the band of substrate 40.

In addition, it may be advantageous to provide one or several rollers 32 for guiding the substrate strip 40, as in the device example 10 shown on the Figure 2. The substrate can be inserted underneath or above a guide roller, depending on the angle of arrival and / or sought exhaust. These angles are those formed between the upper surface of the substrate and the surface bottom of a rim 27, 28. The wetting angles of the fluids used typically vary between 15 and 40 °. The figure also shows positioning means 32a, 32b of the guide roller. In this example, these means comprise a nut 32a screwed onto the shaft of a roller 32 guide and tightening a washer resting on a bean 32b. The nut 32a thus makes it possible to adjust the position of the guide roller shaft 32 located on one side of the roller 31. Similar positioning means may be provided on the opposite side of the roll coating 31 to allow adjustment of the position another guide roll 32. A roller 32 can for example be provided with rollers 34, whose spacing is possibly adjustable to the width of the substrate, in order to guide the substrate strip 40 through the device coating 10.

It is also possible to provide a roll of curved guide, that is to say the surface of which outer has a regular curvature and slightly convex in a plane containing the axis of the roll, to allow the guiding and centering the substrate.

It is also possible to provide means of positioning 32a, 32b along an eccentric axis with respect to the roller shaft 32, like the example shown on Figure 2. Although optional, means of offset positioning can cover a more wide angle of arrival and / or departure substrate on the coating roll 31. Thus, these means allow to adjust the angle of arrival and / or exhaust of the substrate, and more precisely with a mechanism not eccentric. These angles will preferably be adjusted to a value greater than that of the wetting angle of fluid used, in order to avoid the accumulation of fluid and, thus, to decrease the frequency of the stops of production.

The position of a roll 32 may, where appropriate, be adjusted in particular in height to stretch the band of substrate 40 (the substrate then being inserted under the roll 32) and while guiding it so, for example, to optimize the extension of the substrate 40 during its passage at the level of the opening 22.

Figure 3 shows a schematic view from above of a part of a coating device 10, not to scale. More particularly, the figure shows flanks 27a, 28a of the coating tank 21, whose edges 27,28 define the opening 22. The length of the opening (i.e. according to the direction of circulation of the substrate) is typically between 10 and 50 mm. Drawers 23,24 are inserted in the opening thus defined, in which they can slide. Other flanks 26a, 26c of the ferry 21 are shown in the figure. The drawers end by gripping means 23a, 24a adapted for a drawer handling from outside the device 10. These gripping means 23a, 24a can include means of attachment, such as pressure or micrometric adjustment screws, for secure the positioning of the drawers 23,24. The parts drawers are represented by dotted lines: the length of these parts can be adapted according to the desired degree of closure of the opening 22 by the drawers 23,24. In particular, it is possible to provide a length of drawers so that it allows a total filling of the opening 22. It is thus possible to obtain a removable tray, this which facilitates the exploitation, the change of substrate and cleaning. It should be noted that the same result can be obtained using a single drawer. The figure shows also a substrate strip 40 inserted into the device 10, that is to say under the tray 21 and above the roller 31 (not shown). The pattern symbolizes the side of the face to be coated with the substrate. A fluid 60 fills partially the tray 21, its contours being delimited by dots. For the sake of clarity, we have chosen to represent a translucent fluid 60. The position of contour of the fluid at the flanks 27a, 28a is explained in that these flanks 27a, 28a are inclined, in the embodiment shown in the figure. The presence fluid 60 in the tray 21 partly obscures the pattern of substrate 40 visible under the opening 22. Also represented in FIG. 3: the coating roll 31 as well as two guide rollers 32 provided with rollers 34 of guidance of the substrate 40, adjusted to the width of the substrate.

Thus, the use of drawers 23,24 allows control the width of the surface to be coated. After his under the opening 22, the substrate 40 is partially coated on a surface corresponding to the width delimited by the drawers 23,24. The coated surface substrate is symbolized an altered pattern with respect to the pattern of the substrate 40 before coating.

Thus, according to the invention, a tray 21 is obtained. " variable geometry ". It is also possible to do vary the geometry of the tank 21 together with physicochemical properties of the adhesive, in order to obtaining specific properties of the band of substrate 40.

The device 10 described above can also be likely to work in both directions of circulation of the substrate. This is the case of the device or device parts shown in FIGS. 1 to 4. For this, we can impose a certain symmetry of device with respect to the coating roll, in particular regards the section and orientation of the flanges 27, 28 (as shown in FIGS. 2 and 4) and the rollers guide (see in particular Figures 2 and 3). This option allows for example to circulate the band of substrate through the device 10 while adjusting the device settings (such as angles inlet / exhaust and the height of the tank), then circulate the tape in the opposite direction, once settings completed. It saves several meters of substrate band, which turns out to be all the more advantageous that the substrate is expensive.

In addition, once coated, the substrate strip can to be directed in an oven. Typically, the length of the oven is between 1 and 20 meters, its temperature varies between 50 and 250 ° C and the relative humidity is between 0 and 80%. The passage of substrate can also be multiplied inside the oven, in order to save money oven length. The speed of the substrate strip 40 can reach 60 meters per minute inside the oven. During the passage through the oven, the adhesive may, according to its composition, regain fluidity (at least temporarily) and thus perfect the mooring. The parameters mentioned above can be adjusted from so that a mechanical grip takes place without that the adhesive does not cross the support. At the same time, cohesion of the adhesive can quickly increase under the effect of temperature, which favors conversion chemical. For example, the chemical conversion rate obtained with a two-component polyurethane adhesive as described above can reach more than 98% out of oven. It is then sufficient to allow a winding of the substrate strip 40 without release paper (from English "release paper") and without stamping effects (" blocking ") of the band ..

In addition, the device 10 can still advantageously include a coil winding of the substrate. Compared to a direction of circulation of the band (represented by a arrow in Figure 3), a winding roller can be located downstream of the coating roll 31 and, where appropriate, downstream of one or more rollers 32 and downstream of an oven. Rotating the winding roller may be enough on its own to set the band in motion along its conveying path. This does not exclude as much to resort to independent means of training for each of the rollers 31,32 involved in the device 10, in particular where it is desirable to exercise tension on the band.

Thus, the invention significantly improves the coating substrates and can be implemented with substrates with a wide variety of texture. Among substrates that may be suitable, mention may be made of example substrates with wire brushes, papers nonstick, plastic films, especially polyester, polyamide, polypropylene and polyethylene, the metallic films or plastic films comprising metallized yarns, glass fabrics, films with a wood veneer, natural fiber fabrics (eg cotton fibers), antistatic fabrics, artificial textiles made from cellulose (eg rayon) and synthetic or natural nonwovens.

Figure 4 schematically illustrates a view partial profile of a substrate 40 inserted into a coating device according to the invention. The substrate 40 inserted between the coating roller 31 and the flanges 27, 28 of the coating tray has a texture 42 (or relief) of any origin (for example due to weaving or fibers) symbolized by crenellations. In the example of the figure, the substrate 40 is stretched downstream and / or upstream of the device and the edges come flush the substrate. The mechanical stress exerted particularly by the roller 31 on the substrate leads to a spacing patterns or, again, at an opening of the relief forming the texture of the substrate. This gap or opening can not only improve fluid shear applied to the substrate but also allows the fluid to better penetrate the texture, that is to say better wet the substrate.

Finally, the height of fluid above the substrate can be regulated, particularly at the level of the coating tank, this fluid height creating favorable hydrostatic pressure at anchor and impregnation, which it is not possible to get with a squeegee.

The invention is however not limited to variants described above but is susceptible of many other variations easily accessible to the skilled person. In particular, a possible variant includes the use of a plurality of trays 21 and rollers 31 for coating for the successive coating of a substrate strip 40 by different fluids. Another variant concerns coating transfer, that is to say a method whereby a coating layer is applied on a temporary support (eg nonstick paper), which can be then possibly add a product of attachment, to finally allow the transfer of the coating layer, for example by means of a roller, on a final support such sheet metal or any other medium unsuitable for direct coating.

Claims (16)

A method of coating a substrate with a fluid comprising the steps of: (i) providing a substrate (40) and a fluid; (ii) applying the fluid to the substrate (40); (iii) shearing the fluid by the substrate (40) moving relative to the fluid; and (iv) extending the substrate (40) at least partially concomitant with the fluid shearing step. Process for coating a substrate according to claim 1, wherein the substrate (40) provided in step (i) is a meshed substrate and wherein step (iv) is a step extension of the meshes of the substrate. A method of coating a substrate according to claim 1 or 2, wherein the characteristics of the supplied fluid comprise at the time of step (ii): a Brookfield viscosity at 23 ° C of between 100 and 200000 mPas, preferably between 200 and 4000 mPas; a yield point between 1 and 5000 Pa, preferably between 10 and 500 Pa; and a flow time adjustment time adjusted between 1 and 20 seconds, preferably between 2 and 10 seconds. Process for coating a substrate according to one any of claims 1 to 3, wherein the fluid supplied is a reactive adhesive Two-component polyurethane, which includes a resin part comprising at least one polyol and a polyamine, and a hardener part comprising at least one isocyanate. A method of coating a substrate according to any one of claims 1 to 4, further comprising: (v) a step of heating the substrate (40). A method of coating a substrate according to any one of claims 1 to 5, further comprising: (vi) a step of winding the substrate (40). A method of coating a substrate according to any one of claims 1 to 6 using a coating device comprising: a coating tank (21) with an opening (22); and a coating roll (31), the roll (31) facing the opening (22). Coating device (10) comprising: a coating tank (21) with an opening (22); a coating roll (31), the roll (31) facing the opening (22); and return means (29) of the coating tank (21) to an operating position. Coating device (10) according to claim 8, wherein a space is provided between the tray and the coating roll, preferably between 0.1 and 7 mm. Coating device (10) according to claim 8 or 9, wherein slides at least one drawer (23,24). Coating device (10) according to one any of claims 8 to 10, comprising at least one guide roller (32) of the substrate with possibly guide rollers (34). Coating device (10) according to claim 11, comprising means for positioning (32a, 32b) of the guide roller (32) along an axis, possibly eccentric by relative to the axis of rotation of the guide roller (32). Coating device (10) according to one any of claims 8 to 12, comprising in addition an oven. Coating device (10) according to one any of claims 8 to 13, comprising furthermore a coil winding of the substrate. Substrate (40) coating obtainable by the method of coating a substrate of one any of claims 1 to 7. Coated substrate (40) according to claim 15, wherein the substrate is a self-gripping textile.

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