EP0577539A1 - Device for coating and/or impregnating a continuously moving web with a liquid or a pasty fluid - Google Patents

Abstract

Device (1) for coating and/or impregnating a continuously moving (3) web (2) of material with a liquid or pasty product, the device including applicator means (4) for depositing a layer (5) of the said product, at least partially on one face (6) of the said web. According to the invention, it comprises applicator means (4) which are constituted by a reservoir (7, 70, 407) having a perforated region (8, 21) brought into contact with the face (6) to be coated and/or impregnated, around which the said web is deviated, having, over part of its envelope, a set of orifices (9, 90, 410) emerging on the outside and communicating on the inside with a product-feed chamber (10, 110, 410), the surface area and/or the permeability of which are adjustable. <IMAGE>

Description

The invention relates to a device for coating and / or impregnating a liquid or pasty product on a sheet of material in continuous movement.

It will find its use in particular in many technical fields using as raw material plies of flexible material, such as paper, cardboard, textile, or even plastic, which is scrolled at more or less high speed, and where it is necessary to treat one side of the web while it is running in order to deposit on it a layer of liquid or pasty product, such as for example ink, glue, paint, or more generally any technical product, decoration or treatment.

Furthermore, the invention will find its application in the equipment of such machines producing webs of material in continuous movement.

For example, in the field of corrugated cardboard manufacturing, it is customary to secure the paper strips with glue. More precisely, an adhesive film is deposited on one of the faces of these strips, in a regular manner, with a determined quantity, then the two strips are pressed and dried to form the sheet of cardboard.

In this regard, devices are known, such as wetting rollers, constituted by a cylinder dipping in a bath of the product to be applied. The main drawbacks of such devices lie in the difficulty of dosing the quantity of product to be deposited, and in the impossibility of carrying out partial treatments of width less than that of the cylinder.

Spraying devices are also known which allow adjustment of the flow rate by means of spray nozzles. However, in these devices, it is difficult to adjust the uniformity of the deposit made. In addition, the use of pasty products is completely excluded.

There is also known a device for applying a liquid or pasty product to a moving web. continuous, comprising means for depositing a film of liquid or pasty product on a surface of the sheet to be treated and means for feeding the product.

More specifically, the device comprises a reserve of product, constituted by a flexible plastic sheet, pressed above the traveling web by means of a pressing blade, arranged across the web and forming the lower part of the tank.

To authorize the deposition of the product on the traveling web, the said plastic sheet has a rectangular window whose dimensions define the width of the coating and the amount of product deposited.

Although this device is satisfactory in certain cases, it is however ill-suited to high production rates and its reliability depends on the tension in the sheet and the quality of the application of the window on the sheet.

With regard to the coating of a sheet, when only part of the width is coated, it receives a certain amount of moisture with the coating product, in particular in the form of an aqueous emulsion, the untreated part having to be moistened by a light film of water so that the sheet has a fairly regular and homogeneous dryness in order to avoid in particular the phenomena of deformation which would harm its flatness.

However, given the high production rates of the devices used, which can for example go up to 300 m of coated product over a width of 2.50 m, it is difficult to quickly adjust the production sequences, especially when the we must change the product to be coated and / or modify the width of the strip (s) to be coated. However, in practice, such loss of time is detrimental to the proper functioning of the device because, they cause the scrolling of meters of cardboard which are not coated and which must be discarded, which generates the production of waste by loss of materials and increases the manufacturing cost.

The aim of the present invention is to propose a device for coating and / or impregnating a product. liquid or pasty on a sheet of continuously moving material, which overcomes the aforementioned drawbacks and which is not an obstacle to production at high speed.

One of the aims of the present invention is to provide a coating and / or impregnating device, which can be inserted in lines of machines for producing webs of material in continuous movement, and which has a robust and reliable construction allowing its operation at very high frame rates.

One of the aims of the present invention is to provide a device for coating and / or impregnating a liquid or pasty product which makes it possible to precisely control the deposition of said product on the sheet of moving material, as well as its geometry, without however having to modify the structure of the elements used.

Another object of the present invention is to present a device for coating and / or impregnating a liquid or pasty product which, thanks to its structure, allows easy operation control and also the automation of its settings.

Another object of the present invention is to propose a coating and / or impregnating device which does not slow down the production rates if, by its adjustments, it is no longer in the working position.

Another object of the present invention is to provide a coating and / or impregnating device which makes it possible to apply or deposit different products simultaneously or not, which increases their usability.

Another object of the present invention is to provide a coating and / or impregnating device which makes it possible to circulate and recover the cleaning fluids in order to avoid pollution.

Another object of the present invention is to propose a coating and / or impregnating device which makes it possible to obtain a better dryness on the assembly of the web to be coated and / or impregnated while avoiding loss of material generating waste.

Other objects and advantages of the present invention will appear during the description which follows which is however given only for information and which is not intended to limit it.

According to the present invention, the device for coating and / or impregnating a liquid or pasty product on a sheet of material in continuous movement, comprising applicator means for depositing a layer of said product, at least partially on one face of said ply, is characterized in that the applicator means are constituted by a reserve having a perforated zone, brought into contact with the face to be coated and / or impregnated, around which said ply is directed, comprising on a part of its envelope a set of orifices opening outwardly and communicating internally with a product supply chamber, the surface and / or permeability of which are adjustable.

The invention will be clearly understood if reference is made to the following description and to the accompanying drawings which form an integral part thereof.

Figure 1 shows schematically in perspective a first embodiment of the coating and / or impregnating device of the present invention.

Figure 2 shows a cross-sectional view of the applicator means shown in Figure 1 in a closed position.

Figure 3 shows a longitudinal section of the applicator means shown in Figure 2 along the axis III-III.

Figure 4 shows a cross-sectional view of the same applicator means as those illustrated in Figure 2 but in a working position allowing the coating and / or impregnation.

Figure 5 shows a longitudinal sectional view of the applicator means shown, in a working position in Figure 4 along the axis V-V.

Figure 6 schematically shows a second embodiment of the coating and / or impregnating device of the present invention.

Figure 7 shows an exploded view of the applicator means in a first embodiment.

FIG. 8 shows a perspective view with a partial section of the applicator means of FIG. 6.

FIG. 9 is a view in longitudinal section of the applicator means illustrated in FIG. 1.

Figure 10 is a schematic perspective view which illustrates an embodiment of a supply chamber fitted to a device according to the invention.

Figure 11 is a schematic perspective view which illustrates an alternative embodiment of a supply chamber fitted to a device according to the invention.

FIG. 12 is a schematic view which illustrates another alternative embodiment of the body of a feeder core, on which is slidably movable mounted at least one feed delimiter, and at least part of its surface of which is constituted by at least part of an arc, which has two application chambers.

Figure 13 is a schematic view which illustrates another alternative embodiment of the body of a supply means on which is slidably movable mounted at least one supply delimiter, and which has here three branches whose free end is arranged at the top of a virtual triangle, and which has three application chambers.

Figure 14 is a schematic view which illustrates another alternative embodiment of the body of a feeder means, on which is slidably mounted at least one supply delimiter, and which has four branches whose free end is disposed at the top d 'a virtual square, which has four application chambers.

Figure 15 is a schematic sectional view which illustrates a coating and / or impregnating device equipped with a Meyer bar to ensure regular and homogeneous placement of a layer of product to be coated and / or impregnated on a sheet of moving product.

FIG. 16 is a schematic perspective view which shows a coating and / or impregnating device comprising a supply chamber, inside of which two supply delimiters are mounted to move in translation.

Figure 17 is a view similar to Figure 16 which shows a supply chamber, inside which are mounted movable in translation three supply delimiters.

FIG. 18 is a view in longitudinal section which illustrates applicator means shown in FIG. 17.

Figure 19 is a schematic view similar to Figure 15 which illustrates a reserve having two orifices for the introduction of products of different natures.

The invention relates to a device for coating and / or impregnating a liquid or pasty product on a sheet of material in continuous travel.

Although more specifically developed in the context of machine equipment for the production of corrugated cardboard, the present invention is in no way limited to such an application and, in general, it will find its application in all types of field using as raw material plies of flexible material such as paper, cardboard, fabric or plastic, which is scrolled at high speed, and where it is necessary to treat one side of the ply during its scrolling, in order to deposit thereon a film of liquid or pasty product, such as for example ink, glue, an impregnator, or any other decorative product.

With regard to the products to be coated, during the coating operation, they are placed in the absence of air until they are deposited on the material and, therefore, they are locked in the dust shelter and protected from drying so as to prevent any release of gases for the benefit of the environment and people, these gases being particularly dangerous, explosive or flammable at low temperature.

FIG. 1 schematically shows, in perspective, a first embodiment of the device 1 of the present invention, in which there is found in 2 a sheet of material in continuous movement, simulated by the arrows 3.

The device comprises applicator means 4 for depositing a layer 5 of liquid or pasty product at least partially on one face 6 of the sheet, as shown in FIG. 1.

More specifically, these applicator means 4 consist of a reserve 7 having a perforated area 8, brought into contact with the face 6 to be coated and / or impregnated, the surface and / or permeability of which are adjustable.

Referring to FIGS. 2 and 3, the structure of this reserve 7 can be seen. In this case, the reserve 7 is in the form of a cylinder, fixed relative to the running movement 3 of the web 2, around which said ply 2 is deflected as shown particularly in FIG. 1.

Furthermore, the cylinder 7 has, on a part of its casing 8, a set of orifices 9 opening outwardly and communicating internally with a product supply chamber 10.

In addition, the reserve 7 has, in its inner part, a radial shutter tube 11, capable of controlling the radial permeability of the set of orifices 9 and, consequently, the thickness of the layer 5 deposited.

More specifically, in the illustrated embodiment, the reserve 7 is constituted by a set of coaxial tubes adjusted to one another. A first outer tube 12 is pierced with a multitude of radial orifices 9 and regularly spaced by a step marked "p₁" in the longitudinal direction and "p₂" in the radial direction.

For example, when we develop the envelope of the cylinder 12, of diameter 200 for example, good results have been obtained by making orifices with a diameter of 25 mm alternated in staggered rows with a pitch p₁ of 20 mm and a pitch p₂ of 26 mm. These orifices can be cylindrical or of flared shapes to increase the surface of the orifice in contact with the ply as shown in the figures.

It has also been noted that it was sufficient to provide this set of orifices 9 on the half-periphery of the cylinder, and for example, taking into account the aforementioned dimensions, rows of five orifices and rows of four are alternated. However, this information is given as an indication and it could well be envisaged to use other dimensional or positioning characteristics.

Furthermore, inside this first tube 12, a second tube 11 is adjusted, which is itself pierced by a multitude of annular grooves 13 and parallel to each other, and spaced apart by the pitch "p₁".

Under these conditions, these grooves are placed opposite the corresponding rows of orifices 9, and thanks to a free mounting in rotation of the second tube 11 relative to the first tube 12, we will occlude more or less significantly the openings 9 in each row.

By choosing the arrangement illustrated on a half diameter, it is then possible by rotation of the tube 12, either to completely conceal the holes 9, as shown in FIGS. 2 and 3, or to let them communicate with the supply chamber 10 from 0 to 100 % as particularly shown in Figures 4 and 5.

This arrangement will make it possible to adjust the radial permeability of the perforated zone 8 brought into contact with the face to be coated and / or to be impregnated and, consequently, to control the thickness of the deposited layer.

This being so, in order to be able to control the transverse permeability of the set of orifices 9, and consequently the width of the deposited layer 5, as particularly shown in FIGS. 1 to 5, the reserve 7, present in its internal part, at minus one tube 14 transverse shutter.

This third tube 14, fitted in the second tube 11 defines an internal conduit constituting said product supply chamber 10. Furthermore, this third tube is mounted so that it can be moved in longitudinal translation relative to the second tube 11.

Furthermore, as shown in Figures 3 and 5, in order to be able to adjust the width, and act independently on the right and left selvedges 15 of the deposited layer 5, the transverse obturator tube 14 will advantageously consist of two half tubes 14₁ and 14₂ transversely movable in the second tube 11, in order to be able to close off all the grooves 13, as shown in FIG. 3, or some of them as shown in FIG. 5, or to allow free passage over all the orifices.

That said, in order to equalize the deposition of said product on the sheet, the device of the present invention further comprises, placed downstream of the applicator means 4, means for scraping the coated sheet.

In an advantageous embodiment, and as particularly shown in Figures 2 to 16, these means 15 are constituted by a bar 16 called "Meyer", known to those skilled in the art.

This bar is for example constituted by a wire wound in a spiral and welded which is rotated in the opposite direction of the advancement of the web as illustrated in the figure. In addition, this bar is pressed on the sheet, by means of an air chamber 17 for example.

Thus, by an adequate adjustment of the scraping means 15, the overflow 18 is discharged laterally towards the outside of the sheet to be treated.

It should be noted that the device of the present invention is also fitted with various pipes and stop valves, making it possible to inject 14₁ or 14₂ or both, for example the product to be deposited on the sheet, which is then channeled through the inner conduit of the second tube 11 then evacuates through grooves 13 and orifices 9 towards the strip as the arrows 19 in FIG. 5 simulate.

FIGS. 6 to 8 show a second embodiment of the device of the present invention in which the reserve 7 is in the form of a polyhedron 20, one of the faces 21 of which is brought into contact with the web 2 as it travels 3, and has a set of orifices 22 opening outwardly and communicating internally with a product supply chamber.

In this case, as shown particularly in FIG. 7, the product is supplied with orifices 23 distributed over the upper surface and opening into the interior cavity 24 of said polyhedron.

In the mode shown in the figures, the polyhedron is in the form of a tube 20 of rectangular section, inside which one or more shutters 25-30 are provided sliding.

These shutters 25-30 are capable of sliding longitudinally in the interior chamber 24 of the tube 20 to control the longitudinal permeability, and consequently the thickness of the deposited layer, and / or the transverse permeability, and consequently the width of the layer. filed.

Indeed, as in the previous embodiment, by the play of the shutters 25-30, it is possible on the one hand to select a zone of holes 22 in the direction of the step "p₂" and on the other hand to play on the width at coat in the direction of the step "p₁" as shown in particular in Figure 8.

Furthermore, the perforated zone 21 of the reserve 20 is applied to the moving web with a back pressure, simulated in FIG. 6 by the presence of the spring 31 and the lower anvil 32. However, other means of back pressure could be considered.

In addition, similarly to the first embodiment, the device can be equipped, downstream of the applicator means, with scraping means, identified here 33, and co-located for example by a flexible blade rubbing the ply 2 at the outlet of the applicator 7, as shown in FIG. 6.

However, one could also provide a "Meyer" bar with back pressure on the other side of the sheet.

Referring more particularly to FIGS. 9 and 10, it can be seen that the radial shutter means 110 consist of a body of a feeder core 120, part of its surface of which consists of at least one portion of an arc circle, and, by two supply delimiters 140a, 140b mounted movable in translation on said body 120, and, crossed, by supply pipes in order to ensure distribution of the product in the supply chamber 100.

In another embodiment, such as that which is more particularly illustrated in FIG. 12, the body 120 of the feeder core comprises a branch 130, projecting perpendicularly, defining on either side thereof, two chambers supply 130a, 130b, intended to receive a supply delimiter 140c, 140d, constituting transverse sealing means in order to control the transverse permeability of all of the orifices 9 and consequently, the width of the deposited layer.

In another embodiment, such as that which is more particularly illustrated in FIG. 13, the body 120 of the feeder core comprises three branches 150a, 150b, 150c, the free end of each of which is arranged at the top of a triangle virtual circumscribed inside a virtual circle concentric with the axis of the body 120, and which respectively delimits feed chambers 160a, 160b, 160c, each intended to receive at least one feed delimiter 170a, 170b, 170c, of complementary shape and crossed by supply pipes 250 so as to ensure distribution to the product in said supply chambers 160a, 160b and 160c. Thus, in practice, two feed delimiters are necessary to coat a strip and, at least three, if it is desired to coat with minus two bands.

It is also possible, in another embodiment, such as that which is more particularly illustrated in FIG. 14, to produce a body 120 of the feeder core which has four branches 180a, 180b, 180c and 180d, the free end of each is disposed at the top of a virtual square circumscribed inside a virtual circle concentric with the axis of the body 120, and, which respectively delimits supply chambers 190a, 190b, 190c and 190d, intended to each receive at least one supply delimiter 200a, 200b, 200c and 200d of complementary shape traversed by supply pipes 25 intended to allow a distribution of product in said supply chambers 190a-190d.

It should also be noted that, in the embodiment illustrated in FIG. 9, the reserve 70 has a zone 80 perforated with a multitude of radial orifices 90 regularly spaced apart by a pitch marked "p₁" in the longitudinal direction and " p₂ "in the radial direction.

In addition, the reserve 70 is constituted by a first external tube 330, pierced with a multitude of radial orifices 90, regularly spaced, by shutter means 110 adjustable in the first tube 330, and capable of being moved, in rotation, by motor means not shown and, by supply delimiters 140a, 140b, 170a, 170c, 200a, 200d adjusted in the body 120 of the feeder core by defining at least one internal cavity constituting said product supply chamber, and which are able to be moved in longitudinal translation relative to said body 120, by means of motor means 210 which actuate an endless screw 220 in order to delimit the width of the material to be treated. As regards the motor means, they may for example be constituted by linear jacks or by any other device equipped with suitable adjustment means.

In addition, the feeder delimiters 140a, 140b, 140e, 140f, 170a, 170c and 200a, 200d have a body 230 of shape complementary to that of the application chamber in which they are able to be moved in longitudinal relation on the body 120. Thus, by way of example, this body may have a surface constituted by at least one portion of a semi-circle as is more particularly illustrated in FIGS. 10 and 11, or alternatively, of a quarter of a circle as that is shown in FIGS. 12 to 15.

This body 230 has an axial orifice 240 intended to allow the passage of a supply conduit 250 for product to be deposited on the sheet, as well as for the evacuation of the product overflow.

Under these conditions, given that the supply delimiters 140a, 140b, 170a, 170c and 200c, 200d are able to be displaced in longitudinal translation relative to the body 120, the orifices will be concealed, to a greater or lesser extent. 90 of each row and thus adjust the width of the deposited layer.

Thus, depending on requirements, it is conceivable to be able to obtain a more or less significant closure of the orifices 90 so as to allow these to communicate with the supply chamber 100 according to a configuration allowing their use from 0 to 100%.

This arrangement will make it possible to adjust the radial permeability of the perforated area 80, brought into contact with the face to be coated and / or to be impregnated and, consequently, to control the thickness of the deposited layer.

In an embodiment such as that which is more particularly illustrated in FIG. 11, the body 230 of the application delimiter 140e, 140f, comprises a regular distribution of radial orifices 260, intended to allow, depending on their position by compared to the orifices 90, the positioning of the product to be impregnated on the face of the sheet. Furthermore, in accordance with the invention, as shown in FIGS. 12 to 15, using several application delimiters 140a, 140d, 140e, 140f, 170a, 170c, 200a, 200d, it is possible to apply to the face of the tablecloth, different products separately and so to increase the capacities for using the device according to the invention.

It should also be noted that, thanks to the use of several application delimiters, it is also possible to provide for rinsing of the applied products, which facilitates the use of the device, in particular avoiding the risks of pollution.

Furthermore, it is also provided, in order to equalize the deposition of said product on the web, placed downstream of the applicator means, adjustment means, which may for example consist of a "Meyer" bar, as well as devices having different pipes and / or stop valves so as to allow the injection of the product to be deposited on the sheet as well as to regulate or control the circulation of different fluids such as for example cleaning fluid.

Referring to FIG. 15, it can be seen that the ply 2 is deflected by means of a coiling roller 400 which guides it, in particular so that it winds around the cylinder 407. In this form of embodiment, this roller 400 has, on a part of its envelope 401, a set of orifices 409, arranged in staggered rows, opening outwardly and communicating internally with a product supply chamber 410.

In addition, this supply chamber 410 is equipped with two elements 403-404, one of the ends of which comprises a buffer 405 delimiting a supply core 408, which each constitute a supply delimiter mounted movable transversely to the interior of the chamber 410, according to an adjustable and adjustable stroke, as illustrated in FIG. 16, or alternatively, of three elements 406a, 406b, 406c, one of the ends of which also includes a buffer, and which each constitute a delimiter d 'supply by delimiting two supply cores 411, 412, the stroke of which is adjustable and adjustable as required as is more particularly in FIG. 17.

So we get depending on the type of tablecloth to be coated, an adjustment of the width of the coated and / or impregnated sheet and, in the case of three supply delimiters 406a-406c, a possibility of placing different products, which increases the capacities for using the device according to the invention.

When the ply to be coated is not treated, the bar feeder 400 is in a rest position, illustrated in dotted lines in FIG. 15, so that the coating device is outside the ply.

When it is desired to coat a part of this ply, it suffices to place the bar feed roller 400 in an active position illustrated in solid lines in FIG. 15, so that this ply can be wound around the cylinder 407. This results in a coating of the sheet which is done almost instantaneously without stopping the running of said sheet which also makes it possible to avoid the manufacture of products which pass uncoated and which constitute waste.

Under these conditions, the coating product is delivered as and when required on the traveling web so that, to stop the coating instantly over all or part of the width of the said web, it suffices to stop the feed pumps and thus an end-of-order control is carried out which is very precise. Furthermore, the operating stoppages do not lead to any overflow of the product or soaking of the paper capable of weakening the web, which makes it possible to manufacture a product and in particular a quality corrugated cardboard.

Likewise, thanks to this device, the product is not in contact with said ply until its final application. Thus, there can be no prolonged interference of the product with the substrate, which makes it possible, in particular when the substrate tends to absorb one of the components of the coating product more easily, to avoid an imbalance of the formulation since the product coating is constantly renewed, which was not the case with conventional devices commonly used by those skilled in the art of the "doctor blade" type where the coating product reservoir is constantly in contact with the substrate.

It should also be noted, that the adjustments of the coating width of the web are easy to perform, which allows, given the high production rate, to limit falls to only a few meters of cardboard which are not coated correctly.

Furthermore, the quantity of product deposited is also regulated using a "Meyer" bar or "Champion" bar system which rotates in the opposite direction from the running of the paper. Thus, depending on the type of bar used, a greater or lesser amount of the product is scraped and therefore good control of the coating layer deposited on the moving web is obtained.

It is also possible to equip the device, according to the invention, with a flexible metal or plastic doctor blade so as to achieve a better distribution of the layer of product deposited on the traveling web. The excess product is then recovered via an underlying groove 418 formed in the cylinder 407 and which opens into a conduit communicating with a receptacle for recovering this product, which limits the risks of pollution.

Manual adjustment means, for example by means of a steering wheel, or else controlled by information processing means, such as an automaton with display, are provided to move the elements constituting the delimiters d 'feed 403, 404, 406a, 406c, inside the feed chamber 410 so as to coat the web in movement over a desired width.

The adjustment of these means is, moreover, obtained quickly in order to avoid the production of meters of cardboard coated improperly, which makes it possible to avoid waste and also to reduce the cost of manufacturing this cardboard.

As regards the supply of product to be coated and / or impregnated, the supply chamber 410 of the cylinder 407 is connected to supply circuits 420, 430, 440, 450 and 460 associated with pumps 470, 480 and 490.

More specifically, the circuits 420 and 430 are connected to a supply pump 470 and they each comprise, at their inlet, an all or nothing valve 500, 510, of a conventional and known type, which allows them to be opened or closed by according to needs.

Furthermore, the circuits 440, 450 and 460 are connected, on the one hand to a drain pump 480, and on the other hand, to a supply pump 490 and, they are also equipped at their entry with a multi-way valve 520, 530 and 540, which makes it possible to have an adjustable regulation of the circulation of the products to be coated and / or to be impregnated, in particular in combination with the circuits 420 and 430. In fact, it is completely it is possible to supply one of the circuits 420 or 430 with products while providing a supply in one of the pending circuits 440, 450, 460.

By way of example, when one arrives at a determined zone of the moving web to be coated, the supply of product to the supply chamber 410 is stopped by means of the circuits 420, 430 by stopping the operation. of the feed pump 470. There then occurs an immediate cessation of the coating of this product since it no longer arrives in the feed chamber 410 in the feed cores. The drain pump 480 is then started, after the opening of the valves 520, 530, and 540, to remove the product still present inside the supply core of the supply chamber 410 and then the the supply pump 490 is put into operation after having opened the circuits corresponding to the valves 520, 530, 540 so as to fill the interior of the chamber 410 with the new desired product which one wishes to coat on the moving web .

The control of the various valves is a function of the position of the supply delimiters 403-404, 406-406c inside the chamber 410 and, it is in particular possible to regulate and adjust the position of the buffers by means of means of processing information, such as a programmable controller, during the emptying operation by the emptying pump 480 since the volume contained inside the cores is a few liters and that this operation requires a relatively short emptying time .

In certain cases, in order to obtain regularity of the dryness of the sheet so as in particular to ensure a flatness of the material, it is conceivable to moisten the sheet of moving material and in particular the part thereof with a film of water. that you don't want to coat. For this, as is more particularly illustrated in FIG. 17, the supply chamber 410 is equipped with three delimiters 406a-406c, and, the core is supplied with products, by the circuit 420, the valve 500 of which is open, by via the supply pump 470, the circuit 430 being in turn not supplied with functional products since its valve 510 is closed.

The water for humidification is supplied to the interior of the core via the pump 490 by means of circuits 450 and 460, the valves 530 and 540 of which are open. In this case, only the valve 520 of the supply circuit 440 is in the closed position so that it does not allow the introduction of a product inside this part of the core. Of course, the supply of the core with functional products could also be obtained by means of the circuit 440, the valve 520 of which would be open, the water arriving, in this case, by means of the circuit 430, the valve 510 of which is open inside the core, the other valves 500, 530 and 540 remaining closed.

In the case of a change of product, the pump 480 empties the core 412 via the line 430, the valve 520 of which is open while the valves 530 and 540 of the circuits 450 and 460 are closed so as to conserve the water contained inside the core 412.

When the core 412 is drained, the pump 490 is ready again to supply this core with a desired product.

In certain applications, it is necessary to deposit strips of products or several strips of products separately, this is particularly the case in the field of the protection of fragile labels for spirits, where the original abrasive cardboard compartments must be coated. anti-abrasive products.

However, in such applications, for the sake of economy, the coated product is disposed only over a portion of height corresponding to the location of the label. In this case, as more particularly illustrated in FIG. 18, use is made of adjustable pads inserted inside the chamber so as to allow the positioning, on the cardboard web of strips coated with approximately 150 mm each.

In this case, the supply chamber 410 has transversely adjustable shutters constituted for example by tubes capable of controlling the transverse permeability of the orifices 409, and consequently, the width of the deposited layer and which are surrounded by tubes 620, 630 , 640, 650 pierced with holes parallel to each other and spaced apart by a determined pitch, being able to be movable in rotation relative to the transverse shutters.

Thus, in the embodiment illustrated in FIG. 18, the tubes 620 and 630 are arranged so as to allow the placement on the sheet of material in continuous movement of a product, for example anti-abrasive, in the areas marked A, B, and C in this figure according to a suitable width and, the tubes 640 and 650 allow the establishment, in zones E and F, of a layer of water so as to give the tablecloth a dryness uniform notably avoiding its deformation.

Of course, it is also conceivable to have, in zones E and F, coating products different from that deposited in zones A and B and C, depending on the applications and needs, which makes it possible to increase the capabilities of using the device.

Furthermore, as more particularly illustrated in FIG. 19, it is also conceivable to have recourse to a cylinder 407 which comprises two supply chambers 413-414 equipped inside each of them with supply delimiters mounted movable, according to an adjustable stroke and adjustable in translation. Thus, it is possible to dispose of the products to be coated and / or impregnated separately on the web in continuous movement, which makes it possible to obtain a combination of incompatible products, without risk, and thus to produce products having superior qualities. to those currently known.

Of course, there are also means such as for example a "Meyer" bar 415, so as to obtain a smoothing and a metering of the layer ensuring a uniform and regular positioning of the product to be coated on said sheet.

From a practical point of view, this possibility of depositing several products confers an important interest to the device since according to the manufacturing programs, it is thus possible to produce different types of products without constraint created by coating and / or impregnation and thus avoid in particular the often delicate and frequent washing of residual chemicals present in the conduits liable to pollute.

In fact, it suffices in this case to empty the core and to keep it filled with water, all the products remaining upstream of the valves being disposed away from the air as well as in storage drums or in containers. urs appropriate.

It should also be noted that the cylinder 407 can be easily raised in temperature, so as to keep certain products such as paraffins melted or to heat, substantially near the boiling temperature, products which must then be evaporated, by different types of means, such as for example, by means of steam heating cylinders or by the injection of hot air or else the installation of infrared ramps.

So, by pre-heating the sheet of material in continuous movement, the subsequent energy supply is limited, which reduces the cost of the operation.

For this, it is possible to provide a set of electrical resistors 416 with thermostat arranged inside the cylinder 407.

In practice, it has for example been found that when the paper is preheated before coating, for example by bringing the cylinder 407 to a temperature of about 60 ° C., good results are obtained, in particular for a product to be coated brought to 20 ° C.

Of course, other implementations of the present invention could have been envisaged without departing from the scope thereof.

Claims (10)

Device (1) coating and / or impregnating a liquid or pasty product on a sheet (2) of continuously moving material (3) comprising applicator means (4) for depositing a layer (5) of said product, at least partially on one face (6) of said ply, characterized in that the applicator means (4) consist of a reserve (7, 70, 407) having a perforated zone (8, 21, 80) brought into contact with the face (6) to be coated and / or impregnated, around which said ply (2) is deflected, comprising on a part of its envelope a set of orifices (9, 90, 409) opening outwardly and communicating internally with a product supply chamber (10, 110, 410) whose surface and / or permeability are adjustable. Device according to claim 1, characterized in that it comprises, placed downstream of the applicator means, means (15, 16, 17, 415) for scraping the coated web to equalize the deposition of said product. Device according to Claim 1, characterized in that the reserve (7, 70, 407) is in the form of a fixed cylinder comprising at least two supply delimiting elements (14₁, 14₂, 140a, 140b, 140e, 140f, 150a-150c, 200a-200d, 300, 403, 404, 406a-406c) able to be moved in longitudinal translation relative to the body of the reserve and to delimit at least one impregnation and / or coating area at least one product on the web in continuous movement. Device according to claim 1, characterized in that the reserve (7) is in the form of a fixed cylinder (12), comprising in its internal part, a radial obturator tube (11), capable of controlling the radial permeability of the set of orifices (9) and therefore the thickness of the deposited layer. Device according to Claim 3, characterized in that the said reserve (7, 12) has in its internal part, at least one tube (14, 14₁, 14₂) transverse shutter capable of controlling the transverse permeability of the set of orifices (9) and consequently the width of the deposited layer; Device according to claim 1, characterized in that the reserve (7, 12) consists of at least one set of three coaxial tubes (11, 12, 14), the first, outer tube (12) pierced with a multitude radially spaced orifices (9), the second tube (11) fitted in the first (12) pierced with a multitude of annular grooves (13), mutually parallel and spaced apart by a pitch corresponding to the orifices (9 ), able to be moved in rotation relative to the first tube (12), the third (14, 14₁, 14₂) adjusted in the second (11), defining an internal conduit constituting said supply chamber (10) product and able to be moved in longitudinal translation relative to the second tube (11). Device according to Claim 2, characterized in that the said reserve (70) consists of at least one first outer tube pierced with a multitude of orifices (90) which are radial and regularly spaced, by shutter means (110), adjusted in the first tube, capable of being rotated relative to said tube and by at least one supply delimiter (140a, 140b, 140e, 140f, 150a-150c, 200a-200d, 300) adjusted in the body ( 120) of a feeder core defining an internal cavity constituting said product supply chamber (110) and able to be moved in longitudinal translation relative to said body (120). Device according to claim 1, characterized in that the reserve (407) comprises a groove (418) for the recovery of the products. Device according to claim 1, characterized in that the reserve (407) has transverse sealing elements capable of controlling the transverse permeability of the orifices (409) and, consequently, the width of the deposited layer, cooperating with tubes (620, 630, 640, 650) with holes parallel to each other and spaced apart by a determined step. Device according to claim 1, characterized in that the applicator means comprise means for preheating (416) the sheet in movement to be coated and / or impregnated.

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