FACILITY FOR PRODUCING MINERAL WOOL

Abstract

A facility for producing mineral wool, includes at least one supply device for supplying mineral fibers and a fiber-distribution station including a conveyor belt which can move in a longitudinal direction and on which the mineral fibers can be received so as to form a mineral fiber mat, wherein the fiber distribution station includes a roller table arranged on the passage of the mineral fibers that are intended to fall by gravity onto the conveyor belt, wherein each roller can be driven in rotation about a transverse axis of rotation, the rollers being configured to dispose the mineral fibers uniformly through the thickness of the fiber mat formed on the conveyor belt.

Claims

1. A facility for producing mineral wool, comprising at least one supply device for supplying mineral fibers and a fiber distribution station comprising a conveyor belt which is movable in a longitudinal direction and on which the mineral fibers are receivable so as to form a mineral fiber mat, wherein the fiber distribution station comprises a roller table arranged on the passage of the mineral fibers that are intended to fall by gravity onto the conveyor belt, the roller table comprising at least three rollers, each roller being able to be driven in rotation about a transverse axis of rotation, the at least three rollers being configured to dispose the mineral fibers uniformly through the thickness of the fiber mat formed on the conveyor belt.

2. The facility for producing mineral wool according to claim 1, wherein the roller table comprises a plurality of rollers arranged parallel to each other with a spacing between two adjacent rollers that is variable from one end of the roller table to the other.

3. The facility for producing mineral wool according to claim 2, wherein the spacing between two successive rollers of the roller table varies by regularly increasing each spacing in the direction of movement of the fibers from one roller to the other.

4. The facility for producing mineral wool according to claim 1, wherein each roller is driven by individual drive means.

5. The facility for producing mineral wool according to claim 4, wherein each roller is driven at a different rotational speed from that of the adjacent rollers, the rotational speeds of the at least three rollers decreasing in the direction of movement of the fibers from one roller to another.

6. The facility for producing mineral wool according to claim 1, wherein a speed of movement of the conveyor belt is between 5 and 100 m/min so that the mineral fiber mat has a bulk density of between 5 and 40 kg/m3.

7. The facility for producing mineral wool according to claim 6, wherein a conveying belt is arranged between the supply device for supplying mineral fibers and the mineral fiber distribution station so that mineral fibers at an outlet of the conveyor belt are able to fall by gravity onto the conveyor belt via a passage between the rollers of the roller table, the speed of movement of the conveyor belt being a function of a speed of movement of the conveying belt and of the desired bulk density of the mineral fibers in the fiber mat.

8. The facility for producing mineral wool according to claim 1, wherein the fiber distribution station is equipped with a deflector means configured to guide the mineral fibers at an outlet of the supply device to the conveyor belt.

9. The facility for producing mineral wool according to claim 1, wherein the at least three rollers each have reliefs on their surface, arranged regularly along the axis of rotation of the rollers.

10. The facility for producing mineral wool according to claim 1, wherein the at least three rollers consist of toothed rollers, each tooth forming a radial protrusion of the roller body driven in rotation.

11. The facility for producing mineral wool according to claim 10, wherein at least one roller comprises a plurality of toothed rings arranged parallel to one another along the transverse axis of rotation of the corresponding roller.

12. The facility for producing mineral wool according to claim 1, wherein the roller table comprises a plurality of rollers arranged in parallel with one another, among which a proximal roller is arranged at one end of the roller table.

13. The facility for producing mineral wool according to claim 12, wherein the fiber distribution station comprises means for mechanically guiding the mineral fibers in a direction of the proximal roller so that all the mineral fibers entering the fiber distribution station are directed towards the conveyor belt so that the mineral fibers fall onto the proximal roller or between the proximal roller and the roller that is immediately adjacent thereto.

14. The facility for producing mineral wool according to claim 12, wherein a vertical clearance between the proximal roller and the conveyor belt is less than a threshold value depending on an average length of the mineral fiber treated by the facility.

15. The facility for producing mineral wool according to claim 14, wherein the vertical clearance is measured between an external peripheral surface of the proximal roller and the conveyor belt.

16. The facility for producing mineral wool according to claim 1, wherein the roller table extends mainly along an axis inclined relative to a main extension plane of the conveyor belt.

17. The facility for producing mineral wool according to claim 1, wherein the fiber distribution station comprises means for adjusting a tilt of the roller table.

18. The facility for producing mineral wool according to claim 1, wherein the supply device for supplying mineral fibers comprises means for supplying non-binding mineral fibers and a binder in powder form or mineral fibers pre-coated with binder.

Description

[0044] FIG. 1 is a schematic representation of part of a facility for producing mineral wool, showing in particular the mineral fiber distribution station in accordance with one aspect of the invention;

[0045] FIG. 2 is a schematic representation of the distribution station of FIG. 1, according to the invention with a roller table and a conveyor belt that are arranged at a distance from each other to allow the rollers to orient the mineral fibers during deposition onto the conveyor belt and with rollers specifically arranged relative to one another to allow a regular passage of mineral fibers between each pair of adjacent rollers of the roller table and uniformity of the fibers through the thickness of the fiber mat thus constituted;

[0046] FIG. 3 is a detailed view of the roller table of FIG. 2, in a top view;

[0047] FIG. 4 is a perspective representation of a toothed ring forming part of a toothed roller of the roller table of FIG. 3;

[0048] FIG. 5 is a schematic representation of two toothed rollers of the roller table aiming to show the cooperation of these rollers with a mineral fiber mat formed on the conveyor piece;

[0049] FIG. 6 is a schematic representation of an alternative version of the distribution station of FIG. 1, according to the invention with a roller table and a conveyor belt that are arranged at a distance from each other to allow the rollers to orient the mineral fibers during their deposition onto the conveyor belt.

[0050] As a reminder, the invention relates to the particular configuration of an station of a facility for producing mineral wool, and more particularly a mineral fiber distribution station configured to distribute mineral fibers in an appropriate orientation.

[0051] FIG. 1 shows a part of such a facility 1 for producing mineral wool, for example glass wool, with various successive stations participating in the creation of an insulating mat composed of mineral fibers and more particularly the specific distribution station 2 according to the invention.

[0052] Upstream of this distribution station, if the direction of circulation of the mineral fibers within the facility is considered, a first station comprises a fiber supply device 4 wherein mineral, virgin or recycled fibers are mixed, and a binder capable of ensuring that the fibers hold together when the mixture is heated at the end of facility. If necessary, the recycled mineral fibers are for example mineral fibers manufactured for an application of blowing wool, or else transformed fibers in the form of mineral wool for thermal and/or acoustic insulation. In the latter case, the recycled mineral fibers already comprise a hardened binder which does not prevent it from being treated by the same method, namely by adding another binder subsequently.

[0053] In the remainder of the description, when mention will be made of mineral fibers able to pass through a roller table and to be deposited on a conveyor belt in the distribution station, it is possible to refer equally to virgin mineral fibers or to recycled mineral fibers, or to mineral fibers mixed with binder or to with mineral fibers pre-coated with binder, whether for one mineral fiber alone, perfectly separated from the other mineral fibers, or else a clump of multiple intermingled fibers.

[0054] The term virgin mineral fiber may in particular denote here a mineral fiber, in particular a glass wool or rock wool fiber, obtained by internal or external centrifugation, the fibers of which are not bonded to one another by means of an organic binder. The fibers of virgin mineral wool can be coated with a thin layer of sizing or lubricant. The term recycled mineral fiber here refers to mineral fiber bearing on its surface an insoluble and infusible organic binder, already crosslinked. Of course, it may be envisaged that the mineral fibers present in the distribution station are a mixture of virgin mineral fibers and recycled mineral fibers, in any respective proportions.

[0055] The fiber supply device comprises at the outlet a supply duct connected to a conveying belt 8. The conveying belt 8 is configured to move at a first run speed, which can be modified by an appropriate control instruction. The conveying belt 8 has a fiber distribution end 9 which is arranged overhanging the distribution station 2 mentioned above.

[0056] The distribution station 2 comprises at least one roller table 12 equipped with rollers 13 and a conveyor belt 14 on which a fiber mat 15 may form, as the mineral fibers and the binder are deposited on the conveyor belt. The roller table 12 is arranged on the path of the mineral fibers between the conveying belt 8 and the conveyor belt 14.

[0057] The roller table is formed by a plurality of rollers 13 arranged in parallel with each other and able to pivot about axes of rotation parallel to one another. As will be detailed below, these rollers 13 are configured to make it possible on the one hand to carry out a separation of the mineral fibers and to avoid the deposition of mineral fibers agglomerated on the conveyor belt and on the other hand to produce a longitudinal orientation of these mineral fibers, perpendicular to the axis of rotation of the rollers, within the fiber mat 15. In other words, the distribution station 2 is configured to separate the mineral fibers 3 from one another for the mineral fibers which would not have been completely separated in the separation tank, in particular by the arrangement of rollers in roller table within which the rollers 13, which rotate in the same direction of rotation, participate in directing some of the mineral fibers 3 between two adjacent rollers toward the conveyor belt and another part of the fibers toward the adjacent roller to advance along the roller table and be poured further onto the conveyor belt.

[0058] As has been mentioned, the conveying belt 8 has a fiber distribution end 9 which is arranged overhanging the distribution station 2 and therefore the roller table 12. In this roller table, a proximal roller 131, arranged at a first end 121 of the roller table 12 closest to the conveying belt 8, a distal roller 132 arranged at the opposite end 122 of the roller table 12, and a plurality of central rollers 133 arranged successively between the proximal roller and the distal roller, are all distinguished. The distribution station comprises mechanical guiding means for guiding the mineral fibers arriving at the fiber distribution end 9 towards the roller table 12 and more particularly in the direction of the proximal roller 131. These mechanical guiding means can take various forms, among them a flexible duct, a rigid tank forming a funnel as shown in FIG. 6 or a guide ramp as shown in FIGS. 1 and 2, these mechanical guiding means consisting of guiding, in particular toward the proximal roller 131 and the immediately adjacent rollers, the mineral fibers falling under gravity into an environment where they are neither blown nor sucked.

[0059] The distribution station is also configured to give these mineral fibers 3 a longitudinal orientation, that is parallel to the direction of movement of the conveyor belt, this longitudinal orientation of the mineral fibers 3 in the mat 15 being optimal in terms of thermal insulation.

[0060] More particularly, the distribution station 2 makes it possible to give this optimal longitudinal orientation of the mineral fibers, in particular by the dimension of the rollers and their arrangement of the rollers relative to the conveyor belt, and the impact that this can have on the way the fibers are caused to be deposited on the conveyor belt, instead of falling onto it as can be the case in the facilities of the prior art. The mineral fibers 3 and the mineral fibers 5 pre-coated with binder, or if necessary, the fibers bonded by a liquid binder or in powder form, are deposited on the conveyor belt 14, being deposited on the surface of this conveyor belt after being passed between two adjacent rollers 13, under conditions that ensure a longitudinal drive and stretching, and by being combed at the surface of the fiber mat 15 by the contact of the rollers of the roller table 12, as will be detailed below.

[0061] The conveyor belt 14 is extended by a conveying belt, which leads the mat 15 composed of these mineral fibers 3 and the binding elements 5 to an oven, not shown here, and inside which they are heated to crosslink the binder.

[0062] It will be understood that such a facility line is suitable for the production of products based on glass wool fibers, as will be described, but that it is obviously suitable for the production of products based on mineral fibers.

[0063] More particularly, the distribution station and the roller table that it comprises are suitable for the treatment, and as mentioned above for orienting fibers relative to one another, of mineral fibers and for example glass fibers, which have specific dimensions and the average length of which may in particular vary as a function of the dimension of the clump that they are part of, where appropriate with other mineral fibers, these mineral fibers being more particularly intended to clump than other fibers such as wood fibers, and/or able to consist of recycled mineral fibers clumped together by dried binder residue.

[0064] The configuration of the roller table 12 is also particularly suitable for an assembly formed from mineral fibers 3 and binder 5 wherein the binder is formed by fibers pre-coated with binder. The roller table thus allows an optimal arrangement of the mineral fibers and the pre-coated fibers in the fiber mat falling onto the conveyor belt.

[0065] The pre-coated fibers are more particularly here fibers composed of a core made of mineral fibers, advantageously the same mineral fiber as the non-binding mineral fibers present and a shell surrounding the core which is made with a sprayed and dried binder.

[0066] The binder may in particular consist of a binder with a low formaldehyde content, preferably even without formaldehyde, for example binders based on biosourced products. This type of binder is at least partially derived from a base of renewable raw materials, in particular plant-based ones, in particular of the type based on hydrogenated or non-hydrogenated sugars.

[0067] The fact that the binder is implemented via a pre-coated mineral fiber, based on a mineral fiber similar to that treated elsewhere in the facility, makes it possible to treat the arrangement of the binder in the mineral fiber mat in a similar way to that of the non-binding fibers.

[0068] The fiber distribution station 2 according to one aspect of the invention will now be described in more detail, in particular with reference to FIGS. 2 to 5.

[0069] The fiber distribution station 2 comprises, in addition to the roller table 12 and the conveyor belt 14 mentioned above, at least one casing 18 and a support 20 of the roller table.

[0070] The casing 18 is delimited by a plurality of walls inside which the mineral fibers and the associated binder are directed, from the conveying belt 8, to the conveyor belt 14, by passing through the roller table 12.

[0071] One or more mechanical guiding means 19, and for example a deflector as shown in FIGS. 1 and 2 or a tank as shown in FIG. 6, can be provided to guide the mineral fibers arriving at the fiber distribution end 9 towards the roller table 12 and more particularly in the direction of the proximal roller 131. These mechanical guiding means can be arranged projecting from one or more walls of the casing 18 to guide the non-binding mineral fibers and the binder towards the rollers 13 of the roller table 12. More particularly, the deflector means may be movable, in order to be able to modify the zone of the roller table on which the mineral fibers falling from the conveying belt are directed, it being understood that these mineral fibers falling by gravity are mainly directed via the mechanical guide means 19 toward the zone of the roller table 12 comprising the proximal roller and therefore the zone substantially in line with the fiber distribution end 9 of the conveying belt 8.

[0072] As shown in FIG. 6, the tank forming the mechanical guiding means 19 may have a funnel shape with an upper wide end opening to recover a large amount of mineral fibers falling at the end of the conveying belt and a lower end whose opening is reduced relative to the upper end to target the desired area for depositing the fibers on the roller table, namely the zone immediately close to the proximal roller 131.

[0073] The support 20 of the roller table herein has the shape of a frame attached to the walls of the casing 18 to ensure the position of the rollers 13 relative to the casing, if necessary via means for adjusting the tilt of the rollers. The support of the roller table is configured so that all of the fibers come into contact with the roller table 12.

[0074] The support 20 is configured so that the roller table 12 is inclined relative to the conveyor belt 14. In other words, the rollers are arranged parallel to each other along an axis A of the roller table which is inclined relative to a plane P wherein the surface of the conveyor belt extends, on which the mineral fiber mat rests. As has been mentioned, means for adjusting the tilt of the rollers 100 can be provided and associated with the support 20 of the roller table to reduce or increase the angle of tilt a between the axis A of the roller table and the plane P of the conveyor belt.

[0075] FIG. 6 more particularly shows an example embodiment of means for adjusting the tilt of the rollers 100, it being understood that this example is non-limiting and that the tilt adjustment means could take another form. The means for adjusting the tilt 100 here comprise a chain or belt 101, attached on the one hand to an upright of the casing 18 and on the other hand to a distal end 202 of the support 20 of the roller table, whereas the opposite proximal end 201 of the support 20 is fixed relative to the casing 18 at a height less than the height of fastening of the chain or belt to the upright of the casing. The means for adjusting the tilt further comprise means for adjusting the length of the chain or belt, and for example a motor 102 engaged on the belt or the chain, the actuation of which makes it possible to reduce or increase the length of the chain or belt between the upright of the casing and the distal end 202 of the support 20, and thus to lower or lift that distal end 202 and accordingly generate the desired tilt of the support 20 and the roller table 12.

[0076] It may in particular be provided a tilt of the roller table relative to the plane P of the conveyor belt on the order of 1? to 30?, preferably between 5 and 20?. This tilt can be fixed throughout the mineral wool producing process, the tilt value being chosen as a function of the thickness of the mineral fiber mat that it is desired to obtain at the end of the conveyor belt before firing. The operator orients the roller table support according to the desired tilt using the tilt adjustment means 100, then the operator sets the position of this support before the start of the producing process. Alternatively, the adjustment means 100 could be automated, with automatic control of the position of the distal end 202 of the support as a function of the tilt to be given to the roller table being processed, in particular if any facility data are modified.

[0077] This tilt value of the roller table may in particular be dependent on the speed of the conveyor belt. More particularly, the lower the speed of the conveyor belt, the higher the angle of tilt of the roller table.

[0078] The rollers 13 of the roller table 12 are here identical, and each comprise the same number of teeth 22 regularly distributed along the periphery of the rollers.

[0079] As mentioned above, from the roller table a proximal roller 131, arranged at a first end 121 of the roller table 12 closest to the conveying belt 8, a distal roller 132 arranged at the opposite end 122 of the roller table 12, and a plurality of central rollers 133 arranged successively between the proximal roller and the distal roller, are all distinguished.

[0080] The rollers 13 are rotated, all in the same direction of rotation, so as to allow the progression of the mineral fibers 3 from one end to the other of the roller table, with part of these fibers passing between the rollers 13 to fall onto the conveyor belt 14. It is possible to define an upper part of the rollers and a lower part of the rollers as a function of their position relative to a median plane of the roller table, the lower part being the part of the rollers closest to the conveyor belt and of the fiber mat, and it is possible to define the direction of rotation of the rollers such that the upper part of the rollers rotates from the first end to the opposite end of the support.

[0081] Each roller 13 is driven by a drive device 24 specific to it, so that each roller can rotate at a specific rotational speed (Va, Vb . . . Vg), independent and, if necessary, different from the speeds of rotation of the other rollers of the same roller table.

[0082] An impurity discharge device, not shown here, may comprise a suction hood which is arranged at the end of the roller table support and which is configured to suck the fiber conglomerates that could not be separated by the action of the rollers of the roller table.

[0083] As can be mentioned above, the distribution station 2 according to the invention has technical characteristics and dimensions of the various components of this station that are specific to an application for mineral fibers 3 sized with a binder 5 in powder form or with mineral fibers pre-coated with binder. Several of these features are in particular visible in the representation of FIG. 2.

[0084] As shown in FIG. 2, the center distance D between the rollers, and therefore the spacing 130 between these rollers when the rollers are all of the same shape and of the same dimensions, is variable as a function of the rollers considered. In other words, the center distance D1 between the proximal roller 131 and the central roller 133 close to this proximal roller is different from the center distance D6 between the distal roller 132 and the central roller 133. More particularly, the dimensional variation of the distances is regular along the direction of elongation of the roller table, so that the center distances successively advance from the proximal roller 131 to the distal roller 133. Such a dimensional variation of the center distances D makes it possible to allow an equivalent quantity of mineral fibers to pass between the rollers, whether at the proximal roller or at the distal roller, by preventing a majority of the mineral fibers 3 from passing through the first two rollers that they encounter.

[0085] More particularly, the variable spacing extending in the direction of movement of the conveyor belt and wherein the fibers circulate can be explained by the fact that, for the rollers reached first by the mineral fibers, a small spacing is necessary because the mineral fibers naturally move between the rollers in the direction of the conveyor belt under the effect of gravity, while a greater spacing is necessary thereafter, because the mineral fibers that circulate along the roller table by passing from roller to roller have acquired a transverse speed, which in this case is upward, due to the tilt of the roller table, making it necessary to force the mineral fibers to pass between the rollers in order to reach the conveyor belt.

[0086] The spacing 130 of the rollers is considered here as a function of the center distance D between the rollers, but it is necessary to take into account the radial dimension of the protruding teeth 22 of the rollers 13.

[0087] Furthermore, the mineral wool producing facility is advantageously configured in that a variation in the rotational speeds of each of the rollers 13 is provided, since the rollers are driven independently of one another. It is desirable for the rotational speed of the first rollers reached by the fibers to be high so that these first rollers can accelerate and drive the mineral fibers opposite the conveyor belt toward which they are attracted by gravity, and in particular when the roller table is inclined and involves a movement with an upward component for the mineral fibers in order to join the subsequent rollers of the roller table, and it is desired to gradually lower the rotational speed of the rollers in order to cause the mineral fibers to fall in the direction of the conveyor belt.

[0088] It is understood that these features make it possible to ensure a uniform arrangement of the mineral fibers 3 through the thickness of the fiber mat 15 formed on the conveyor belt 14, while ensuring that an amount substantially equal to mineral fibers 3 is able to pass between each pair of adjacent rollers 13 of the roller table 12 within a given period of time. This thus avoids the formation of a layered mat of fibers with plies whose fiber density is different from each other, and in particular with a lower stratum that is denser than the others, which could be formed if the mineral fibers were to pass mostly between the first two rollers of the roller table.

[0089] It may be provided to combine the features of increasing the spacing between the rollers and lowering the speed of the rollers, in the direction of movement of the fibers.

[0090] Furthermore, the distribution station 2 is configured to allow a longitudinal orientation of the mineral fibers within the fiber mat. To this end, the vertical clearance DV between the proximal roller 131 of the roller table and the conveyor belt 14, that is the minimum distance between the components of this proximal roller 131 and the conveyor belt, has a value less than a threshold value depending on the type of fibers brought to be deposited on the conveyor belt, and therefore here depending on a dimension of the mineral fibers. The vertical clearance may in particular be measured between the external peripheral surface of the proximal roller and the conveyor belt. The vertical clearance DV here is less than 30 millimeters. Such a vertical clearance value, here even smaller than that which could be implemented in applications with wood fibers, ensures that the mineral fibers, after having passed through the roller table, remain in contact with the roller at one end thereof when they are deposited on the conveyor belt. As will be detailed below, this makes it possible to ensure a longitudinal orientation of the fibers on the conveyor belt, parallel to the forward axis of the conveyor belt.

[0091] Means for adjusting the vertical clearance 150 can be provided to adjust, at least upon starting the method for producing mineral wools, the value of the vertical clearance DV and adapt it as a function of the average fiber lengths intended to fall onto the roller table 12 via the conveying belt 8 and the mechanical guiding means 19. FIG. 6 more particularly shows an example embodiment of means for adjusting the vertical clearance 150, it being understood that this example is non-limiting and that the vertical clearance adjustment means could take another form. The vertical clearance adjustment means 150 here comprise a plate 151 secured to the proximal end 201 of the support 20, said plate 151 being mounted on a rail 152 integral with an upright of the casing 18. The vertical movement of the plate 151 along the rail 152 makes it possible to adjust the vertical position of the proximal end 201 of the support 20 and therefore the position of the proximal roller 131 relative to the conveyor belt 14 that remains fixed thereto. Once the desired vertical position is reached, the position of the proximal end 201 of the support 20 is fixed by fastening the plate to the upright of the casing.

[0092] In order to take into account the thickness of the fiber mat 15 which increases as it advances on the conveyor belt, the roller table 12 is inclined in accordance with what has been mentioned. In this way, the characteristic concerning the maximum vertical clearance DV mentioned for the proximal roller, namely a maximum distance at which the proximal roller 131 extends from the surface of the conveyor belt 14 onto which the mineral fibers that this proximal roller can drive can be deposited, can be reproduced for each of the rollers of the roller table 12, this time considering the surface of the fiber mat 15 rather than the surface of the conveyor belt 14, the roller table 12 being configured so that the fibers that the central rollers 133 and the distal roller 132 drive are deposited on a mineral fiber mat already present on the conveyor belt.

[0093] Another feature of the facility and of the distribution station is specific to the use of mineral fibers, namely the speed of movement V14 of the conveyor belt 14. This speed of movement V14 makes it possible on the one hand to drag and stretch the mineral fibers 3 still in contact with the roller 13 which participated in the passage through the mineral fibers of the roller table, and it is calculated to allow the production of mineral fiber mats having a fiber density of less than 40 kg/m3. As a non-limiting example, the speed of movement of the conveyor belt can be on the order of 5 to 100 meters per minute. Furthermore, for the production of mats with such a density, the speed of movement V8 of the conveying belt 8 bringing the mineral fibers in contact with the roller table and the differential of movement speeds between the conveyor belt and the conveying belt may also be considered.

[0094] FIG. 3 makes the support 20 of the roller table more particularly visible.

[0095] The frame of the support 20 has a rectangular shape, with two large sides 21 perpendicular to the axis of rotation of the rollers and two small sides 23 connecting these large sides. On the large sides are arranged clevises 25 for securing the motorized drive means 24 and rotation bearings 26 associated with each of the rollers 13, with alternately on the same large side a clevis and a rotation bearing.

[0096] Each roller 13 has on the surface, that is to say on its peripheral surface arranged around the axis of revolution, reliefs that are arranged regularly along the axis of rotation of the rollers in order to break the regular profile of the peripheral surface of the rollers, in particular to control the interaction between the mineral fibers and these rollers.

[0097] In the example shown, the reliefs are formed by a plurality of teeth 22. In other words, each roller 13 comprises teeth forming projections arranged in successive parallel rings on the axial dimension of the roller, the rings of teeth 22 being separated from each other along a same roller of a pitch 220. It is notable in the top view of FIG. 4 that the rollers 13 are arranged so that the rings of teeth 22 of two adjacent rollers are axially offset, to avoid any interaction between the teeth of two adjacent rollers during their rotation.

[0098] Each roller 13 may in particular be formed by a plurality of toothed rings 28 pressed against one another along the axial dimension of the roller. As shown in FIG. 4, such a ring 28 may comprise a ring body 280 able to be secured to the rotating shaft of the roller and a toothed peripheral portion 282, and these two parts of the ring can advantageously be made up of two different materials from one part to the other. The toothed portion may for example be overmolded onto the ring body, with means for fastening by mating shapes.

[0099] Each ring of teeth 22, and in particular when it is formed by a toothed ring 28 visible in FIG. 4, comprises teeth 22 regularly distributed angularly, here numbering twenty, the teeth thus being characterized by an angular pitch, here on the order of 18?, between two successive teeth on the periphery.

[0100] Each tooth 22 protrudes from an outer surface of the ring, a radial dimension DR of the tooth being measured between the free end 222 of the tooth and the outer surface of the ring.

[0101] The teeth 22 are in particular dimensioned so that their free ends 222 can comb the mineral fibers 3 not yet pressed on the surface of the mineral fiber mat 15, when the teeth pass during their rotation between the conveyor belt and the median plane of the roller table comprising the axes of rotation of the rollers.

[0102] The spacing 130 of the rollers previously mentioned is determined by considering the center distance D between the axes of rotation of two adjacent rollers and the radial dimension DR of the teeth, in particular visible in FIG. 4, the spacing being measured between the free end of the teeth of a roller and the adjacent roller.

[0103] As is the result of the foregoing detailed description, the invention addresses the technical problem of orienting mineral fibers in the fiber mat to be directed toward the crosslinking station, in particular by providing a particular configuration of the rollers at a short distance from the conveyor belt, and more particularly here less than 30 millimeters from the conveyor belt for the proximal roller and less than 30 millimeters from the surface of the mat formed by the mineral fibers likely to be present on the conveyor belt in line with the other rollers. This configuration makes it possible to deposit the mineral fibers on the conveyor belt with ends of the mineral fibers that are simultaneously in contact with the conveyor belt and the rollers, which avoids having to release the fibers far from the conveyor belt as in the prior art whereupon they are haphazardly deposited, under the effect of gravity, onto the conveyor belt. The simultaneous contact of the mineral fibers with the conveyor belt or the fiber mat and one of the rollers makes it possible to stretch the fibers and to position them in an optimal longitudinal position for the thermal insulation of the mineral wool obtained after crosslinking the fiber mat.

[0104] This longitudinal arrangement of the mineral fibers on the conveyor belt can even better be ensured when the rollers comprise teeth and that they are positioned and dimensioned to comb the surface of the mineral fiber mat and more particularly the mineral fibers likely to protrude from this surface of the mat, in a reverse combing direction to that of the direction of movement of the conveyor belt.

[0105] These characteristics and resulting advantages are more precisely detailed with reference to FIG. 5, which schematically shows the action of the rollers, here toothed rollers, on the fibers to orient them longitudinally.

[0106] As mentioned, the proximal roller 131 is arranged at a distance from the conveyor belt 14 such that a vertical clearance DV is less than a minimum value chosen as a function of the dimensions of the mineral fibers 3 intended to be deposited on the conveyor belt 14. The value of the angle of tilt of the axis wherein the roller table 12 extends, relative to the surface of the conveyor belt, makes it possible to ensure that the other rollers are arranged so that an equivalent vertical clearance DV, that is to say one that is less than the minimum value chosen as a function of the dimensions of the mineral fibers 3, is formed between the roller and the upper surface of the fiber mat formed on the conveyor belt in line with said roller.

[0107] In this configuration, if we refer to the schematic representation of the proximal roller 131 and of a first mineral fiber 31 passing through the roller table 12 between this proximal roller and the adjacent central roller, the rollers are sized, and where appropriate the teeth forming radial projections of the roller body, and arranged at a distance from the conveyor belt such that the first mineral fiber 31 is deposited on the conveyor belt or on first mineral fibers already present on the mat while one end of that first mineral fiber is still in contact with a part of the proximal roller 131, here a tooth 22. In this way, it is notable that according to the invention, the mineral fibers are in simultaneous contact with the roller and the conveyor belt, or the fiber mat present on the conveyor belt, at the time of their deposition on the conveyor belt. The fibers driven by the rotation of a roller and passing between that roller and the central roller immediately adjacent to that roller are oriented by gravity in the direction of the conveyor belt, with a first free end that ends in the direction of the mat and a second end that remains in contact with the roller.

[0108] The average length of the mineral fibers, at least equal to 30 millimeters as previously mentioned, and the vertical clearance having a value less than this average length value of the mineral fibers, here 30 millimeters, make it possible to ensure that the free end of each mineral fiber passing through the roller table between the proximal roller and the immediately adjacent central roller enters into contact with the mat while it is still in contact with the roller. In this way, the free end of the mineral fiber being driven longitudinally by the passage of the conveyor belt, the mineral fiber is stretched and positioned longitudinally.

[0109] If reference is made to the first mineral fiber 31 shown in FIG. 5, the mineral fibers are drawn by the movement of the conveyor belt, which in the example shown brings a first free end 31a of the first mineral fiber 31 into a direction, and by the rotation of the roller, which in the example shown tends to bring the second free end 31b into the other direction or which at least tends to retain that second free end 31b.

[0110] Each mineral fiber thus deposited on the conveyor belt or on the fiber mat takes a main longitudinal orientation, with the first free end 31a pressed against the fiber mat. It may result from the deposition of the mineral fiber once released by the roller, as shown in FIG. 5 for a second mineral fiber 32, that the second free end 32b of this second mineral fiber remains raised and is not pressed against the surface of the fiber mat. The arrangement of the roller table, with central rollers and the distal roller which are arranged according to a vertical clearance less than the previously mentioned threshold value, enables a function of combing this second mineral fiber, and more generally all of the mineral fibers not yet pressed on the surface of the mineral fiber mat, the rotational movement of the lower part of the roller, and in particular of the teeth 22, tending to push the second end of the teeth back toward the conveyor belt.

[0111] In general, the embodiment which was described above is in no way limiting: it is in particular possible to imagine variants of the invention comprising only a selection of the described features isolated from the other features mentioned in this document, if such a selection of features is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art.

[0112] By way of example, in an alternative embodiment not shown and without this being limiting on the number of variants that can be envisaged, the facility comprises a separation tank wherein the conveying belt can be arranged and which comprises separation means, not shown here, which allow a first step of separation of the fibers, in particular to avoid large clumps of fibers. These separation means may in particular consist of toothed rollers and/or blowing means. The fiber separation tank is configured so that the fibers treated by the separation means penetrate into a fiber feed duct connecting the separation tank to the distribution station mentioned above. In particular, the fiber feed duct can be configured to allow the fibers treated by the separation means to fall under gravity.