SK127998A3 - Process and apparatus for the production of a mineral fibreboard - Google Patents

Abstract

A multiply bonded mineral fibre board may be obtained by longitudinally compressing a fleece and then dividing it into two or more layers (43, 45), subjecting at least one of these layers to thickness compression and then recombining and bonding them, and preventing break-out of the tensioned sub-webs between the compression stage (53, 54) and a bonding stage (25). <IMAGE>

Description

Technical Field Y

The invention relates to a method and apparatus for producing mineral fiber boards.

BACKGROUND OF THE INVENTION

In recent years, various improvements in the production of mineral fiber boards have been published. A substantial improvement in the properties of the mineral fiber boards can be achieved, for example by reorienting the fibers in the manufacturing process such that the fibers are aligned predominantly perpendicular to the large surfaces of the board. As a result, it is possible to increase the compressive and tensile strength perpendicular to the plane of the slab.

Various methods are known in which the fibers are reoriented so that the article obtains a corrugated arrangement, but usually a higher efficiency is obtained when the final article is substantially free of corrugations. There are many disclosed methods for longitudinally compressing a fibrous web, for producing either a corrugated or non-corrugated product. Such a method is described in DE 16 35 620. It is clear from the description and the drawing that the extent of longitudinal compression is quite small (maximum 35% as shown in the examples) and that it can be accompanied by a slight increase in thickness during longitudinal compression. .

Many methods including longitudinal compression also include significant thickness compression, after longitudinal compression and before final curing. In EP 133 083, for example, the web is subjected to substantial longitudinal compression in many stages, and is then subjected to compression to the thickness at the entrance to the curing oven. The final product has a substantially isotropic fiber orientation.

Other methods of longitudinal compression, designed to prevent crimping, are disclosed, for example, in US 4,567,078, WO 91/14816 and WO 94/16164.

It would therefore be desirable to develop a longitudinal compression method which avoids substantial curling of the exit web but which results in a significant improvement in properties, as compared to the properties achievable by known methods. In particular, it should be desirable to produce mineral fiber boards with improved physical properties, such as improved compressive and tensile strength, and improved insulation values. In particular, it should be desirable to achieve these better results with less use of raw materials such as reduced fiber and binder.

SUMMARY OF THE INVENTION

These objectives are achieved by a continuous production process of bonded mineral fiber sheets having a web thickness of more than 2 t. wherein in this manner the web is deeply compressed, substantially without simultaneous longitudinal compression, to a first thickness and to a basis weight w, then the web is longitudinally compressed, turning to a second thickness, thereby forming a longitudinally compressed web, further forming the longitudinally compressed web conveyed to a bonding station to form a bonded fiber board according to the invention, the essence of which is that the first thickness is in the range 0.8 to 1.5 t, in particular in the range 0.9 to 1.3 t, the second thickness is in the range 1 to 1.3 tons, in particular 1 to 1.1 tons, the longitudinal compression is carried out continuously or in one or several stages, without undulating the web and forms a longitudinally compressed web having a basis weight of 2 to 10 w and the web is forced to be held against tearing when conveyed between the longitudinal compression stage and the coupling stage.

Since the compressed web has a basis weight of 2 to 10 w, it can be reasonably asserted that the longitudinal compression can be performed at about 0.5 to 0.1 of the original web length.

The invention also encompasses a method of continuously manufacturing bonded mineral fiber boards, in which the fiber felt is pre-compressed in a thickness direction to a thickness of 1 to 3 thicknesses of the final product (especially substantially the same thickness as the nominal thickness of the final product) and then subjected to longitudinally compressing by means of at least two pairs of conveyors, driven at different speeds, to form the longitudinally compressed felt, and then joining at a bonding station to a bonded mineral fiber plate according to the invention, the essence of which is the felt thickness in the longitudinal compression stage; upstream of the bonding station is about 0.9 to 1.3 of the thickness of the final product, wherein the longitudinal compression is performed substantially without compression to a thickness, wherein the longitudinal compression is performed to 0.5 to 0.1 of the original length, which compression is performed at a a continuous compression zone, and the felt is held to prevent tearing between the longitudinal compression unit and the coupling station.

The invention further encompasses a novel device as defined in the claims. Since the web is in a certain longitudinal compression, it is subjected to some bulging outside the conveyor through which the web is conveyed, and must therefore be forced to hold the web out of the supported conveyor rollers or other guides that will adequately restrict the longitudinally compressed web in the desired longitudinal path. and prevent significant deflection of the web from the desired path.

Surprisingly, it has been found that to use a suitable bursting means (i.e. a device) when it is a compression unit and the means may be a strip between the longitudinal station. In this new way they can

In this way, products with significantly better properties can also be produced relatively thinly compared to the prior art. Unlike known products, new products differ in a very homogeneous density. The fibers are uniformly twisted and no preferred fiber orientations can be detected (FIG. 12). On a larger scale, it has been found that the random orientation of the fibers is arranged in a partial wavy pattern.

Significant savings in material resources have been achieved by the process according to the invention compared to conventional production methods. In particular, the amount of fibers required to achieve specific physical values may be up to 15 to 25% lower. Products made by the new manufacturing process are therefore much lighter than conventional products having the same physical properties. As production costs depend heavily on the amount of fibers used, the new ones achieve significant savings.

In the preliminary compression stage, it pre-compresses to a basis weight w (kg / m ² ) and then further compresses it to a final weight in the longitudinal compression unit, which may also be referred to as an optimization unit. Contrary to expectation, this extremely high compression of the pre-compressed web to 2 to 10 times, in particular 2 to 6 times the weight of the pre-compressed web, results in virtually no corrugation of the web surface. Multiplying the basis weight of the web or felt can be achieved by suitable longitudinal compression of the web with substantially equal distances between the upper and lower conveyors, for example, according to the nominal thickness of the final product.

Although the longitudinal compression of the web can be achieved in a series of successive steps, the longitudinal compression of the web is preferably performed in one step, the basis weight of the longitudinally compressed web and the bonded board being 2 to 6 times, especially 2.5 to 5 times, and most preferably 2.5 to 3. 5 times the weight of the pre-compressed web. resultant

The product has high compressive strength and good insulation value.

The longitudinal compression is preferably performed by feeding the web by the first conveyor to the second conveyor, wherein the second conveyor is driven at a lower speed than the first conveyor. The conveyor device may consist of a belt, roller or chain conveyor. Roller conveyors are preferably used, since these conveyors achieve a total micro-density that is extremely homogeneous. In particular, the diameter of the rollers and the spacing between the rollers are such that the nonwoven or ripple of the web can be substantially neither ruptured. In particular, the distance between two adjacent rollers is 1 to 50 mm, more preferably 2 to 30 mm and in the most preferred embodiment less than 20 mm. The allowable roll distance depends essentially on the fleece density, the degree of longitudinal compression in the compression unit, and the thickness of the plate produced. Products of different thickness and high density can be produced with a small roller distance. Although the rollers may be individually driven, in a preferred embodiment they are joined to groups, each group having a row of rollers.

In particular, products having a density of approximately 40 to 200 kg / m ³ can be produced by the process according to the invention. In a particularly preferred variant, after longitudinal compression, the web is expanded in the conveying direction. For this purpose, for example, the web can be first compressed to a higher pressure, for example 20 to 40% relative to the desired density of the final product, and then released by stretching. This helps to prevent undesirable undulations of the web. The overall micro-density can also be improved. Pressure relief by stretching may be particularly important in the case of high density products, for example products with a density greater than 140 kg / m ³ . The compression and release operation may also be repeated.

The web may consist of glass wool, mineral wool or other synthetic fibers. However, the fleece consists

In particular, of chemical glass fibers, in particular of mineral fibers, and contains an uncured binder. The binder content may be. about 0.7 to 7%, often 1 to 4%. In particular, the binder is curable in a curing oven. The bonding of the web can also be effected by reinforcing the fibers of the web itself or by felting, instead of or in addition to bonding by curing the binder.

Preference is given to using mineral fibers of an average length of about 0.3 to 50 mm, in particular 0.5 to 15 mm, and a thickness of about 1 to 12 μνα, in particular about 3 to 8 μπι. Mineral fibers with an average length of about 2 to 10 mm, in particular about 2 to 6 mm, and an average thickness of about 1 to 12 µπ, in particular about 3 to 6 or 7 µπ, may also be used. The average length of the mineral fibers, which is usually shorter than the length of the glass fibers, is generally 2 to 4 mm, and the average diameter value is 3 to 4 μπι.

During the laying of the web onto the conveyor, the predominant fiber orientation is preferably altered or partially compensated. This can be achieved, for example, by means of a winding device adapted to swing obliquely to the conveying direction or by air deposition. In this way, the density distribution of the web can be improved and the fiber orientation can be changed, which has a beneficial effect on the mechanical properties of the resulting product. The primary web is preferably deposited on the collecting belt in layers by means of a rocking belt adapted to rock at an angle to the conveying direction. Thus, the web is formed primarily by cross-lapping. In this way, the fibers are partially reoriented, and the homogeneity (transverse distribution) of the web deposited on the collecting belt can be improved.

Advantageously, 2 to 60 layers, in particular 2 to 40 to 50 layers, may be superimposed. This creates a certain reorientation of the fibers.

The fibers may deviate, for example, transversely from the fibers

While the compression can be carried out at the same time, in particular longitudinal compression.

According to a particularly preferred variant, the thickness of the longitudinally compressed web is divided into two or more web auxiliary layers, parallel to the main webs of the web, while to prevent any deformation in the thickness direction, the web auxiliary layers are retained on opposite web webs. The at least one nonwoven web is compressed in the thickness direction or in the longitudinal direction and the nonwoven webs are then joined and subsequently glued. In this way, a multi-layer product can be produced.

Although the adherence of the nonwoven webs is normally satisfactory due to curing of the binder, the mating surfaces of the nonwoven webs may be sprayed or impregnated with the binder prior to bonding. In principle, the bonded nonwoven layers held together by suitable means can be compressed once more to a thickness. However, these webs are preferably longitudinally compressed prior to bonding. This longitudinal compression can be performed in a ratio of 1.1: 1 to a maximum of 2: 1. The size of the contact surfaces can be increased by the final longitudinal compression so that the bonding of the webs is improved.

Although the new device may have individually driven rollers, it is particularly provided with at least two groups of rollers, with two or more rollers. In particular, the compression unit is provided with at least about 10 to 12 rollers to compress the fibrous batt. Thus, the compressed felt can advantageously form a corrugated fiber structure. Further preferred embodiments are defined in the subclaims. The invention also encompasses a method of continuously producing single-layer or multi-layer fibrous plates, in which the fibrous batt is pre-compressed by at least two pairs of conveyors driven at different speeds, further compressed longitudinally or longitudinally and thicknesswise, and then consolidated according to

The invention, which pre-compresses the nominal thickness of the longitudinal compresses in the optimum essence, is that the fibrous batt is at 1 to 3, usually at 1 to 1.5 times the finished product, and then thicknessed or compressed only by the longitudinal unit using conveyors provided with two opposing roller groups, each group having two or more rollers, wherein the longitudinal compression is performed at 0.5 to 0.1 of the original length in the continuous or quasi-continuous compression region, and wherein the thickness of the finished product is achieved in the optimization unit.

The invention also encompasses an apparatus for carrying out the described method, comprising at least one fiber felt collecting belt, a pre-compression stage for compressing the fiber felt, at least two conveyors arranged one behind the other, and driven at different speeds for longitudinal or longitudinal and thickness compression of the fibrous of a felt and a curing oven for consolidating a longitudinally and thickly compressed felt according to the invention, the principle of which is that the optimization unit consists of conveyors provided with two opposite groups of rollers, each group having two or more rollers, a quasi-continuous compression region passing through a row of rollers or groups of rollers.

A preferred variant wherein the longitudinally compressed web is divided into two or more nonwoven webs, at least one of which is then longitudinally compressed prior to reconnection, is a manufacturing method having a wider usability and value than the method used only as the second stage in the method of the invention described above.

It is already known from CA-A-1057183, WO 88/00265 to cut the web to a thickness into the webs of the web and to compact one of them and then to re-bond them and cure them.

-9a EWP-A-277,500. The known methods have a number of disadvantages. For example, the backsheet of the web is often only pre-compressed so that the finished product has a relatively low compressive strength. Although the compressive strength can be improved perpendicularly by the corrugation of the web, the flexural strength deteriorates. These methods also have the disadvantage that the bottom web of the web is only subjected to weak compaction and substantially no rearrangement of the fiber orientation, except for possible corrugations.

According to another aspect of the invention, there is provided a continuous process for producing bilayer or multilayer bonded mineral fiber sheets from a mineral fiber web, by pre-compressing the web, feeding the pre-compressed web to the splitting device, splitting the web by splitting means a nonwoven web in the thickness direction, wherein said nonwoven webs are re-bonded and conveyed to a bonding station where the web is glued, according to the invention, which is characterized in that the mineral fiber web is compressed longitudinally and / or thickly (especially compressed longitudinally) in the squeezing unit, in front of the splitter, avoiding tearing of the stretched nonwoven layers between the squeezing unit and the coupling station by the holding means.

In an example of a preferred embodiment of the method of manufacture, a method for continuously producing mineral fiber boards with two or more boards of different density is produced, whereby the fiber felt is pre-compressed, further the precompressed fiber felt is fed to the splitting device. or a plurality of auxiliary layers consisting of at least one auxiliary layer in the thickness direction, further the auxiliary layers are bonded and transported to a bonding station where the felt is bonded, according to the invention, which is characterized in that the fibrous felt is compressed longitudinally for splitting

By means of a device in the compression unit, without compression to a thickness in the continuous compression region, in which the nominal thickness of the product is maintained while avoiding tearing of the stretched nonwoven webs between the compression unit and the coupling station by the holding means.

Also provided is a new device for the continuous production of bonded mineral fiber webs of mineral fiber web, consisting of means arranged one after the other in the conveying direction for pre-compressing the web, from the first web means for conveying the web to the splitter, from the splitter to the web two or more nonwoven web layers, from means for compressing at least one nonwoven web layer in the thickness direction, second conveying means for subsequently joining the backing layers and conveying them to the bonding station where the web is bonded, from the bonding station for bonding the compressed web, according to The invention is based on the fact that the first means of transport form a pressing unit which is provided with at least two pairs of conveyors arranged one after the other in the conveying direction, and that the device is provided with means for preventing rupture. and stretched nonwoven webs between the compression unit and the joint station.

The method and apparatus according to these aspects of the invention differ from the known methods and apparatus essentially in that the pre-compressed web is further compressed in the thickness and / or longitudinal direction, in particular in the longitudinal direction, by the compression unit so that the webs produced can have a relatively high density and different fiber structure prior to cutting. This has the advantage, for example in the case of double-layer boards, that the lower density layer, in contrast to conventional layers, has a better compressive and tensile strength perpendicular to the main surface. Therefore, a specific tensile and compressive strength can be achieved with a smaller amount

11 materials, especially with less fiber, compared to known methods.

Therefore, in order to prevent the stretched web layers from tearing or wrinkling between the compression unit and the coupling station, the device is preferably provided with suitable holding means and / or conveyors for holding the web layers to the main surfaces.

To form a highly compacted topsheet, the at least one slit web layer may be compressed to a thickness. In this way, a higher puncture resistance is achieved. Advantageously, one non-woven layer of the web, compressed to a thickness, can also be compressed longitudinally. Twisting the reoriented fibrous batt when compressed to thickness may induce compensation for the resulting elongation.

In order to improve the bond between the fleece auxiliary layers, the contact surfaces of the fleece auxiliary layers can additionally be provided with a binder before they are joined. In many cases, the quality of the binder originally applied to the fibers is already sufficient to achieve a good bond between the nonwoven layers of the web when the binder is cured. Another possibility to improve the bond between the fleece auxiliary layers is to longitudinally compress the bonded layers before curing the binder. By shrinking these layers, for example in a ratio of 1.1: 1 to a maximum of 2: 1, it is possible to increase the contact area and thereby obtain a better bond between the layers.

One of the problems associated with the continuous production of bilayer or multilayer products may be the soiling of the used belt knife from ¹ binder adhering to the fibers. According to a preferred variant of the process according to the invention, it is therefore proposed to continuously clean the distributor device. This can be done, for example, by means of a solvent stream, for example water, directed towards the cutting edge of the band knife.

The longitudinal compression is preferably carried out

Compressive strength and strength Due to the optimization of the passage of the web through the compression unit provided with a series of two conveyors arranged one after the other in the conveying direction, the speed of the at least one conveyor pair is lower than the speed of the previous conveyor pair. Preferably, the pre-compressed web is longitudinally compressed in at least one stage. Longitudinal compression allows the fibers to be reoriented, so that in particular the tensile strength is improved, material resources saving is possible perpendicular to the major surfaces of the fibrous structures.

For the manufacture of products having a corrugated fiber structure, it is advantageous to adjust the distance of the opposing conveyors from the conveyor pairs to approximately 0.5 to 0.1 distances of the following conveyors, the conveying path defined by the two conveyor pairs being substantially aligned in line and peripheral speed of at least the immediately following pair. of conveyors is lower than the peripheral speed of the previous pair of conveyors. In this way, nonwoven layers with a corrugated fiber structure can be produced (FIG. 2).

Before entering the compression unit, the web is already compressed to about 0.8 to 1.5, in particular 0.9 to 1.3 times the nominal thickness, and most preferably to the nominal thickness of the finished product so that substantially only longitudinal compression is performed by conveyors of the compression unit. Longitudinal compression is in the continuous compression region in which the nominal thickness of the product. Surprisingly, a very homogeneous overall micro-density can be achieved if the web is already pre-compressed to approximately the nominal thickness of the finished product in front of the compaction unit and then compressed only longitudinally. The mineral fiber web is preferably longitudinally compressed at a factor of 2 to 10, more preferably 2.5 to 5, and in a particularly preferred embodiment for a factor of about 2.5 to 3.5. In some cases, for example, when the density of the bottom auxiliary layer of the finished product is less than approximately maintained

-13 different from being a fleece

100 kg / m ³ , simultaneous longitudinal and thickness compression can be recommended. The degree of thickness compression is preferably less than 2, and in particular less than 1.5.

Although the conveyors of the compression unit may be conveyor belts, the conveyors are in particular. in a preferred embodiment constructed as roller conveyors. On conveyor belts, the rollers have the advantage of repeatedly expanding and squeezing by the rollers during compression. As a result, the products surprisingly have a very homogeneous micro-density (density divided in a small volume unit) and very good mechanical properties, such as compressive and tensile strength and puncture resistance, for products with a significantly reduced weight compared to conventional products. The fibers are uniformly corrugated and no preferred fiber orientation can be detected (Fig. 11). On an enlarged scale, it has been found that the random orientation of the fibers is partially arranged in a wavy pattern. This type of fibrous structure is referred to by the inventor as a wavy fibrous structure. Another desirable effect is to compact the surface of the nonwoven layers, which is achieved by means of rollers.

Although each individual roller can be individually steered, in a preferred embodiment, each roller conveyor consists of two opposing groups, each of at least two rollers, each roller of the conveyor being driven at the same peripheral speed. Since the rollers are joined into groups of at least two rollers, the compression unit and its control are greatly simplified.

Preferably, the web is expanded in the conveying direction, upstream of the distributor device. By unwrapping the web, unwanted undulations or rupture of the web can be prevented. for example when transferred from a compression unit to a distributor device.

The web may consist of glass wool, mineral wool or other synthetic fibers. However, the web is folded

14, in particular of mineral fibers, and contains an uncured binder. The binder content may be about 0.7 to 4% by weight. In particular, the binder is curable in a curing oven. However, the bonding of the web can also be effected by reinforcing the fibers of the web itself or by felting.

Preferably mineral fibers of an average length of about 0.3 to 50 mm, in particular 0.5 to 15 mm, and a thickness of about 1 to 12 µm, in particular about 3 to 8 μτη, are used. Mineral fibers of an average length of approximately 1 to 10 mm, in particular approximately 2 to 6 mm, and an average thickness of 2 to 10 μτη, in particular approximately 3 to 7 μτη, may also be used. The average length of the mineral fibers, which is usually shorter than the length of the glass fibers, is generally 2 to 4 mm, and the average diameter value is 3 to 4 μτη.

During laying of the web on the conveyor, the predominant fiber orientation is preferably changed or partially aligned. This can be achieved, for example, by means of a spinning device adapted to swing obliquely to the conveying direction or by air deposition. In this way, the density distribution of the web can be improved and the fiber orientation can be changed, which has a beneficial effect on the mechanical properties of the resulting product. The primary web is preferably deposited on the collecting belt in layers by means of a rocking belt adapted to rock at an angle to the conveying direction. In this way, the fibers are partially reoriented and the homogeneity (transversal distribution) of the web deposited on the collecting belt can be improved.

Advantageously, 2 to 60 layers, in particular 2 to 40 to 50 layers, may be superimposed. This creates a certain reorientation of the fibers.

The fibers may deviate, for example transversely from the conveying direction, while the compression, in particular the longitudinal compression, can be performed simultaneously.

The invention also relates to a device according to the features of claim 27. The principle of this device according to the invention is that between

An additional compression unit is provided for the further thickness or longitudinal compression of the web, in particular for longitudinal compression, and for reorienting the fibers, by a preliminary compression stage and a separating device. The conveyor belts serve to maintain the already obtained fibrous structure and to prevent any deviation or puncture of the stretched web.

In the subclaims, further preferred embodiments, according to one preferred embodiment, of the at least one distribution device and the subsequent holding device are adjustable independently of each other, perpendicular to the strip surface in the region of the multilayer unit, so that the device can be used. selectively for the manufacture of monolayer or multilayer products. The means for compressing the at least one auxiliary layer of the web are preferably provided with at least two independently driven. Thus, the slit auxiliary layer may be compressed. The pairs of conveyors are roller conveyors, the distance between the rollers being adjustable. As a result of this arrangement, the fleece auxiliary layers can be compressed both in thickness and lengthwise.

The connecting station is preferably formed by a curing oven, in front of which there are cooled feed rollers. In this way, any adhesion of the binder to the rollers can be prevented and clogged. In a preferred embodiment, the peripheral speed of the conveying means between the splitter and the coupling station and the peripheral speed of the conveyor belts in the furnace are individually adjustable so that, for example, the nonwoven can also be compressed and released before the curing furnace.

pairs of conveyors. the nonwoven also preferably formed longitudinally

-16Overview of figures in the drawing is shown on a continuous basis

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail with reference to the drawing, in which Fig. 1 shows a mineral wool product produced by compression to a thickness and with fibers oriented substantially parallel to the surface; Fig. 2 shows a corrugated product, with most of the fibers arranged perpendicular to the surface; Fig. 3 shows a bilayer product whose upper layer has an increased density; Fig. 4 shows a product of substantially homogeneous density and randomly oriented fibers; Fig. 5 shows a product where a randomly oriented fiber layer is combined with an increased density layer; Fig. 6 is a simplified drawing of a device for producing single-layer mineral fiber boards, where Fig. 6a) is a machine shown in continuous operation 6b) is a one-stage operation; FIG. 7 is a diagram showing the principle of machinery for the continuous production of monolayer or multilayer mineral fiber boards of varying density; 7a) the machine is shown in continuous operation and with a continuous compression region, and in FIG. 6b) is shown in a single-stage operation; Fig. 8 shows a detail of the compression unit; Fig. 9 shows a side view of the compression unit according to Fig. 8; Fig. 10 shows a plan view of the compression unit according to Fig. 8; Fig. 11a) shows this region for a board having substantially parallel oriented fibers, and Figs. 10b) and 10c) for mineral wool boards produced by the novel process and spaced apart, perpendicular to the plane of the boards; .12 is a perspective cross-sectional view of a two-layered board, the fibrous structure of which is shown on an enlarged scale and shown in FIG.

Fig. 13 shows schematically the different possible arrangements of four pairs of conveyors arranged one after the other in the conveying direction.

DETAILED DESCRIPTION OF THE INVENTION

Figures 1 to 5 show the fiber orientations that often occur in soft boards. Boards whose fibers are arranged parallel to the surface (Fig. 1) have comparable weak mechanical properties. In order to compensate for this disadvantage, the fibers are often reinforced with binder and their density is increased.

Products with fibers oriented perpendicular to the surface can be obtained if the board shown in Fig. 1 is cut into strips, these strips are rotated 90 °, and then arranged in a bundle. This type of production is complex and therefore uneconomical. According to another type of production, the fleece is corrugated (according to FIG. 2). These products have significantly better compressive and tensile strength, perpendicular to the plane of the board, than with boards of the type shown in FIG. Corrugated fiber boards may bend and may therefore be used in insulating tubes or for lining in curved areas. On the other hand, they have the disadvantage that these products tend to break along the undulations and also have inadequate puncture resistance. Another disadvantage of these known products of this type is that there may be noticeable variations in density in the board.

FIG. 3 shows a two-layer product having an upper density of increased density. These products are suitable for applications requiring high wear resistance or increased surface protection. Due to the high density of the topsheet, the average density can be reduced.

Fig. 4 shows a product with substantially isotropic fiber orientation, substantially randomly oriented

-18vláknami. These products have excellent mechanical properties, such as high compressive and wear resistance and puncture resistance and high tensile strength perpendicular to the plane of the board. Their thermal conductivity is essentially the same as that of the products of FIG. These products are generally lighter than comparable products having substantially parallel fibers for comparable or improved mechanical properties.

FIG. 5 shows an article in which the advantages of the increased density top layer and the fiber structure of FIG. 4 are combined. In particular, it is an object of the invention to further improve the properties of the products of the type shown in Figures 4 and 5.

Device 11 '. 6, for carrying out the manufacturing process, comprises, in the conveying direction F, a pre-compression stage 17 and an optimization or compression unit 19 adjacent to the pre-compression stage 17 and consisting of two pairs of 30. of the felt or web, and also from the conveyor belt 40 and the pressure belt 42 and from the feed rollers 63, 65 for conveying the compressed web to the curing oven 25. Finally, conveyor belts 67, 67 are provided in the curing oven 25 to ensure passage of the compressed web through the oven. holding on opposite major surfaces during curing of the binder.

The pre-compression stage 17 consists of a lower conveyor belt 27 and a pressure belt 29. By means of the pre-compression stage 17, the primary web, preferably deposited in the layers on the collecting belt 15, is pre-compressed to such an extent that the web indicated by 20 can be introduced into the compression unit 19 for this purpose.

The pair 30, 32 of the conveyors of the compression unit 19 consists of an upper and a lower group 30, 30 '. 32 '. 32

Each roll consists of six rollers 12. Each top and bottom rollers 30, 30, 32, 32 have a separate drive (not shown in detail), so that the conveyors can be driven at different speeds relative to each other. Also, the upper groups of rollers 30, 32 are height adjustable so that the device 11 can be used to produce products of varying thickness. The spacing between the upper and lower groups of rollers 30, 30, 32 is particularly the same.

In carrying out the method of the invention, the web is pre-compressed to a nominal thickness of the finished product and then compressed longitudinally at a conveyor distance corresponding approximately to the nominal thickness of the finished product. Under these circumstances, the conveyor 30 is driven at a first speed, and the conveyor 32 is driven at a second speed, which is typically no higher than half the first speed, so that the corresponding longitudinal compression of the web 20 is essentially achieved. extend after longitudinal pressing. This step may prevent the heavily compressed web from rippling or tearing up when conveying to the curing oven 25.

Downstream of the squeezing unit 19 is a conveyor belt 40 and a retaining belt 42 / for forcing the compressed web to be torn apart, i. The holding device 42 consists of a relatively unwinding unwinding belt which is disposed on the nonwoven conveying layer. The feed rollers 32, 32 are arranged in front of the curing oven 25 and can be cooled. The distance between the lower and upper groups of rollers is preferably set to approximately the nominal thickness of the finished product. This has the advantage that the fiber orientation once set in the compression unit 19 no longer changes.

The device 11 shown in FIG. 7 differs from the device shown in FIG. 6 in principle that:

The compression unit 19 has four conveyors, each with four rollers. The device may be provided with a multiple unit which may be used to produce multi-layer boards and may in principle be used together with the device 11 '. For simplicity, the same reference numerals are used in the following description for the same components as in the description of the device 11.

The device 11 shown in FIG. 7 for the production of mineral fiber boards essentially consists, in the arrangement in the conveying direction F, of a rocking belt 13 and a collecting belt 15 for respectively storing and receiving the fibers produced by the fiber production unit (not shown in detail), and a preliminary compression stage; and from the optimization or compression unit 19 for forming a felt or web 20 having optimized fiber orientation and homogeneity, downstream of the compression optimization unit 19 is an optional multiple unit 21 which may be used to produce multi-layer mineral fiber boards. Downstream of the multiple unit 21 are conveying means which grip the compressed web on opposite main surfaces and convey it to a coupling station, for example a curing oven 25.

Said production unit serves for the continuous production of fibers, in one of the known ways, for example in a cascade spinning process. A binder (not shown) is sprayed onto the fibers produced, also known as the primary web, and transported by a conveyor (not shown) to the rock belt 13. This belt is located above the collection belt 11 and pivots transversely to the conveying direction of the collection belt 15. However, a different orientation of the rocking movement is also possible; for example in the traffic direction. As a result of the rocking movement, the primary web 26 is deposited in a transverse lap, as can be seen in FIG. 7, on the collection belt 15 advancing, depending on

-21 collector belt speed and oscillation frequency. However, they may be used. other means, such as gas nozzles, to create the most irregular orientation of the fibers on the collection belt. As a result of the forward movement of the collecting belt 15, the fibers are oriented mostly obliquely to the conveying direction. When viewed from above, the two layers of webs extend substantially transverse to each other.

The pre-compression stage 17 consists of a lower conveyor belt 27 and a pressure belt 29. The pressure belt is height adjustable so that the primary web 26 can be pre-compressed in various stages.

Each upper and lower group 31 31: 33. 33; 35 ', 35: 37'. The rollers 37 of the pairs of conveyors 21, 22, 27, 22 have a separate drive, which is not shown in detail in FIG. In particular, the drives used are infinitely variable to a certain extent, so that, for example, the upper and lower groups of rollers may have different peripheral speeds. A slightly higher peripheral speed of the upper group of rollers is needed, for example, when this group is positioned not horizontally but at an angle to the lower group of rollers.

8-10 illustrate an exemplary embodiment of a compression unit 19 wherein conveyors with groups 31. 3133. 33.; 35. 35; 37, 37 of the rollers provided with rollers 39 are arranged on a support structure 71. Sprockets 115 are arranged at one end of each roller 39 (FIG. 10). In each case, four or five rollers 39 are interconnected by drive chains (not shown) and form a group of rollers. Each group of rollers is provided with a drive 117, 117, 117, 117, 118, 118, 118, 118

The upper and lower rollers 31, 31 of the first pair of conveyor 31 taken in the conveying direction (arrow F in FIG. 9) are vertically adjustable. The vertical adjustment of the upper roller group 31 is performed by a drive member 81 which drives the spindles 73, 73 by means of cardan shafts 77),

-22rr.

For vertically adjusting the lower pair of conveyor 31, a drive member 43 is used to drive the spindles 75, 75 by means of cardan shafts 79, 79.

Unlike the first roller group 31. 31, the position of the remaining roller groups is either not adjustable or only adjustable together (for the upper group). As can be seen in particular from FIGS. 8 and 9, the three rear lower groups 33. 35. The 37 rollers, taken in the conveying direction, are supported on a fixed frame 56 while the three upper groups 33, 35. The 37 rollers are supported on a vertically adjustable frame 87. This frame 87 is vertically adjustable at the top of the support structure 71. The vertical guide of the adjustable frame 87 is secured by a linear guide 93 on the stands 95. 95. 97. 97. The vertical adjustment of the adjustable frame 87 is secured a drive member 103 which drives the spindles 9, 89, 91, 91 arranged in pairs on the support structure 71 by means of cardan shafts 99, 99, 101, 101.

The upper roller groups 33, 35, 37, the last of which has five rollers 39, are disposed on the support rails 105. pivotally connected to the adjustable frame 87. the pivot pin 107. In the embodiment shown, the front end of the rails 105 is taken in the conveying direction. connected to the adjustable frame 87 by another pair of spindles 102. 109. By adjusting the spindles 109, 109, it is possible to swing the support rails 105 up or down from the horizontal direction, so that, for example, a track can be formed which tapers in the conveying direction F. Spindles 109, 109 are also connected by cardan joints 111, 111. here again, one actuator 113 is sufficient to adjust them.

FIG. 12 illustrates various ways in which four pairs of conveyors can be arranged in principle. However, the adjustment of Figs. 13b and 13c cannot be performed by the compression unit of Figs. 8-10.

-233.1, 31.33. 33, 35. 35, 37. The rollers of Fig. 12d are suitable, for example, when light products are to be produced.

An optional multiple unit 21 is provided downstream of the optimization unit 19 comprising a row of conveyor pairs, which in the embodiment shown is a dual density device. This device consists of a splitting device 41, for example a band saw or a band knife, shown only in the outline of FIG. 7, for splitting the compressed web into two sub-webs 43 and 45. The multiple unit 21 is also provided with conveyors 47, 49, 50, 51, for example conveyor belts, which strengthen the compressed nonwoven layers 43 and 45 to a thickness. Any gaps arising for geometric reasons between the manifold and, for example, the conveyor belt 49 or 50 may be bridged, where possible, by guide plates. In this way, the rupture of the fleece layer 43, which is compressed in different degrees, is prevented. ¹

In particular, the splitting device 41 and the following conveyor 49 are adjustable in height so that the web exiting the compression unit 19 can be cut into the lower and upper webs 43, 45 of the web, in virtually any thickness. In addition, the splitter 41 and the conveyor belt 49 may also be displaced independently of each other and upwardly so as to be located outside the fleece transport range. The conveyor belt 49 then serves as a retaining belt. Due to its vertical adjustability, the device 11 can optionally be used to produce single-layer or multi-layer boards. In principle, the device may comprise a plurality of splitting devices and corresponding retaining strips to allow the production of boards with three or even more layers. Also, the distance between the upper and lower rollers is adjustable so that outer layers of different thickness can be produced.

-24Can compensate the distance between so they can

A pair of conveyors 53, 54 arranged downstream of the conveyors 50, 51 serve to compress to the thickness and longitudinally compress the upper auxiliary layer 45 of the web. In particular, the pair of conveyors 53, 54 is provided with rollers 55 which are in each case connected to form an upper and a lower group of rollers, each with three rollers. The pairs of conveyors 53, 54 are arranged to be driven at different peripheral speeds, so that the elongation that may occur as a result of the compression to the thickness is followed by the longitudinal compression. Also, the upper and lower rollers are adjustable to produce outer layers of different thickness.

The compressed topsheet 45 of the web is reconnected to the bottomsheet 43 by conveyor belts, chutes or guide plates (not shown in detail). In most cases, it is possible to dispense with the retaining strip for the highly compressed topsheet 45 of the web. In the area where the upper auxiliary layer 45 and the lower auxiliary layer 43 'are in contact, a metering device 57 for the binder is provided. With this arrangement, it is possible to apply a binder to the contact surfaces of the upper auxiliary layer 45 and / or the lower auxiliary layer 43 of the web so as to obtain a better bond after curing of the binder. In most cases, especially when no elongation has been compensated, dispensing devices can be dispensed with.

The bonded upper and lower auxiliary webs 43 and 45 of the web are coextruded by the feed belts 59 and 61 and the feed rollers 63, 65 and conveyed thereto to the curing oven 25. The peripheral speeds of the feed belts 59, 61 and feed rollers 63, 65 are preferably individual adjustable so that the compression or release of the compressed webs 43 and 45 may be performed as desired. In particular, at least the feed rollers 61, 65 can be cooled. within

Conveyor belts 67, 67 'are provided in the curing oven 25 which are permeable to hold the curing layers 43 and thereby completed sheets.

for air. The conveyor belts 67, 67, and 45 substantially limit the nominal thickness of the conveyor belts during the process. as well as the conveyors 59, 61, 63, 65 are vertically adjustable and can therefore be adjusted to the thickness of the web supplied from the multiple unit 21 or the compression unit 19.

The production of a multi-layer board may be carried out as follows: A primary web supplied from a collection chamber (not shown) and provided with a binder and in the case of wool of mineral fibers, usually weighing 200 to 800 g / m ² in particular 200 to 400 g / m ² An average thickness of 15 to 20 mm, often up to 75 mm, is fed to the rocking belt 13. This belt is deposited primarily on the nonwoven 15, which moves continuously forward. Depending on the speed of the collecting belt 15 and the oscillation frequency of the swivel belt 13, a larger or smaller number of nonwoven layers are formed on the collecting belt in the vertical direction. The number of layers is selected according to the desired board properties, such as weight, compressive strength, etc., of the final product. The number of layers also depends on the fiber arrangement, i.e., the individual state of fiber processing between the fiber processing unit and the curing oven. Typically 2 to 40 to 50 layers are deposited on the collecting belt 15.

Saving primary nonwoven 26 using a pendulum belt 13 creates not only a good transverse distribution of the fiber material on the collecting belt 15 _years, but also contributes to uniform fiber orientation if certain homogenisation. Further, the orientation of the fibers can be controlled by changing the direction of travel of the rocker belt.

The deposited web is subjected to pre-compression in a pre-compression stage 1/7. The pre-compression is usually performed so that the web can still be clamped

-26 rolls of the first pair of conveyors (nominal thickness plus a maximum of approximately 40% of the roller diameter required). Certain deviations of the web after pre-compression are desirable so that sufficient adhesion between the web and the rollers is achieved at the inlet of the compression unit to provide the desired fiber reorientation. Since, for products with a density of only about 80 and 90 kg / m ³ , the expansion forces present in the web during longitudinal compression are much lower, a slight thickness compression in addition to longitudinal compression is usually required to produce these products to adjust the desired stress and avoiding undesirable undulations of the fleece surface.

In the case of duplication, i.e., when the web is primarily deposited in layers, the web surface has steps showing varying degrees. These steps can be compensated at least partially in the preliminary compression stage 17 by driving the upper belt 29 at a slightly higher speed than would be necessary for further transport.

The partially smoothed web may be subjected to further smoothing in the compensation unit 19. For this purpose, for example, the first and second pairs of conveyors may be adjusted so that they are not aligned. It is also possible for any additional pairs of conveyors to be set in an unbalanced configuration. This misalignment causes the conveyed web to be subjected to bending or lateral deflection which may cause the web surface to be smoothed. The smoothing effect may be increased when the second pair of conveyors runs a little slower than the first pair.

In particular, the longitudinal compression in the ratio of 2: 1 to 6: 1 (depending on the peripheral speeds of the first and last pair of conveyors 31 and 37) is performed in the compression unit 12, with rollers spacing substantially corresponding to the nominal board thickness (i.e. compaction by longitudinal compression without compression) thickness). In the case of lighter products can

However, longitudinal compression, together with simultaneous thickness compression, should be preferred. In the case of a single speed, each pair of conveyors 31, 33 and 35, 37 may be driven together with a single drive.

Although conveyor belts may be used for compression, rollers are preferred because there is a relatively lower tendency to corrugate fleece surfaces, even at a significant degree of longitudinal compression. The web can be longitudinally compressed longitudinally by means of rollers 39 without apparent undulations on its surface. The only possible explanation for this phenomenon is that there is little adhesion between the rolls and the fleece. The rollers also effect the reorientation of the fibers, since the web between the rollers may increase somewhat in volume, but in any case without curl. The result is a good compaction of the fibrous web inside and on the surface.

In the multiple unit 21, the compressed web may be divided into two or more auxiliary layers 43. 45. It is also possible to omit the multiple unit or to place it outside the conveying path and feed the web with optimized fiber structure directly to the curing oven.

The separation of the web 20 is effected by a band saw or a band knife in a manner known per se. The topsheet 45 of the fiber-optimized web is then subjected to thickness and longitudinal compression. In this case, the fibers of the upper nonwoven layer 45 are further compacted by thickness and then longitudinal compression. The non-woven topsheet 45 pressed to the thickness then returns to the continuously shifting nonwoven bottomsheet 43.

Compressed layers 43, 45 of the web, in particular the lower stretched layer 43, are guided between the compression unit 12 and the curing oven 43 by means of conveyors 47, 49, 59, 61, 63, 65 formed between the compression unit 19 and the curing oven 25. belts system

-28 in a ratio of 1.1: 1 to 2: 1.

it may result from chains or rollers, in particular conveyor belts, to prevent any breakage or bulging.

In the curing oven 25, the binder is cured in the web. Curing takes place at a temperature of 180 to 300 ° C, in particular about 200 to 150 ° C. The binder also provides a firm bond between the layers 43, 45 of the low and high overall density webs.

To improve the adhesion of the nonwoven layers 43, 45, a solid or liquid adhesive (dispensing device 57) may be applied to their interface at a multiple unit prior to bonding.

Alternatively or additionally, the bonding between the webs 43, 45 may be improved if the webs somehow contract before entering the curing oven 25, particularly depending on the degree of contraction, some corrugation of these layers.

The effect of the shrinkage is to increase the size of the contact area so that the adhesion / felting of these layers can be improved.

According to the device according to the invention, the web or felt is compressed longitudinally, in particular in one step. Alternatively, the device may also be controlled such that a series of compression zones or a continuous compression zone is formed during compression.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

Board type:

Fibrous material:

Plate thickness:

Average overall density: Bond:

Average fiber length:

single mineral wool 100 mm approx. 90 kg / m ³ modified phenol resin 3 to 4 mm

-29Fiber diameter: Pre-compression:

Longitudinal Press:

Compressive strength at 10% deflection: Tear strength (division into

Example 2

Board type: Fiber material up to 4 gm approximately to nominal thickness

3: 1

0.035 N / mm ² layers): 0.020 N / mm ² double-layer mineral wool

Plate thickness: 100 mm Outer layer thickness: about 20 mm Substrate thickness: about 80 mm Average total density: about 90 kg / m ^: Average total density of outer layer: 155 kg / m ³

Total density of the base layer:

Average fiber length:

Average fiber diameter:

Preloading:

Thickness compression:

Longitudinal Press:

Compressive strength at 10% deflection: Tear strength (division into

Example 3

Board type:

Fibrous material:

kg / m ³ modified phenol resin 0.5 to 10 mm 3 to 6 gm approximately 1.5 nominal thickness

1.8: 1 to 1.1: 1 3: 1

0.25 to 0.030 N / mm ² layer): 0.013 to 0.018

N / mm ² double layer mineral wool

Plate thickness: 100 mm Outer layer thickness: about 20 mm Substrate thickness: about 80 mm Average total density: about 90 kg / m- Average total density of outer layer: 155 kg / m ³

Total density of the base layer: 75 kg / m ³

Binder: modified phenolic resin

Average fiber length: about 3 to 4 mm

Average fiber diameter: 3 to 4 / m

Preloading: approximately 1.8 to 1.5 nominal thickness

Thickness compression:

Longitudinal Press:

Compressive strength at 10% deflection: Tear strength (division into

Diameter of used rollers

1.5: 1 to 1.1: 1 3: 1

0.25 to 0.030 N / mm ^{2 of} layer): 0.013 to 0.018

N / mm ² 80 mm

Compared to boards that do not have optimized fiber structure and density, the weight of boards produced by the novel process can be reduced by up to 25-40% with otherwise substantially the same mechanical properties. The tensile strength perpendicular to the plane of the plate has improved considerably, as is evident from the highly structured fracture region (Figs. 11b to 11c).

The products according to the invention can be used for any purpose intended for synthetic fibers, for example for sheets and webs used for thermal insulation, for fireproofing and fire protection or for soundproofing and sound control or in suitable form in horticulture as a vegetation medium.

Claims (7)

PATENT CLAIMS 1/7 2Π 6a. About // <? // · A method of continuously manufacturing a bonded mineral fiber sheet having a thickness tz of a web of a thickness greater than 2t, wherein in this manner the web is deeply compressed, substantially without simultaneous longitudinal compression, to a first thickness and to a basis weight w, followed by longitudinal compression wherein the longitudinally compressed web is further conveyed to the bonding station and bonded at the bonding station to form a bonded mineral fiber board, characterized in that the first thickness is in the range of 0.8 up to 1.5 t, in particular in the range 0.9 to 1.3 t, the second thickness is in the range 1 to 1.3 t, in particular in the range 1 to 1.1 t, the longitudinal compression is carried out continuously or in one or more in several stages, without undulating the web and forming a longitudinally compressed web having a basis weight of 2 to 10 w and the web is forced to hold against breakage when the honey is conveyed zi a longitudinal compression step and a connection step. Method according to claim 1, characterized in that the longitudinal compression of the web is carried out in one step. 3/7 I Method according to claim 1 or 2, characterized in that the longitudinally compressed web and the joined board have a basis weight of 2 to 6 w, in particular 2.5 to 4 w. 4/7 / Method according to claims 1 to 3, characterized in that the longitudinal compression of the web is performed by feeding the web with the first conveyor device (30). -32 to a second conveyor device (32), the second conveyor device (32) being driven at a lower speed than the first conveyor device, and wherein the conveyor device (30, 32) consists of two opposing roller groups (30, 30), each group is provided with at least two rollers (39) spaced apart. 5/7 ft Μ ‘t- V 9th Method according to claim 4, characterized in that the opposing roller groups of the at least one conveying device (30, 32, 31, 33, 35, 37) are driven at different speeds. 6/7 Method according to one of Claims 1 to 5, characterized in that the web is stretched longitudinally after compression. Method according to Claims 1 to 6, characterized in that the web is made of chemical glass fibers, in particular of fibrous mineral wool, and comprises an uncured binder, the binder being cured by heating in the bonding station. Method according to one of Claims 1 to 7, characterized in that the nonwoven is formed by cross-lapping. Method according to one of Claims 1 to 8, characterized in that the web before the splicing station is divided parallel to the main surfaces into two or more fleece auxiliary layers, each fleece auxiliary layer being forcedly held against tearing as it passes towards the splicing station and wherein at least one nonwoven web is compressed to a thickness or length, the auxiliary layers then being joined -33a stuck in the junction. Method according to claim 9, characterized in that the contact surfaces of the fleece auxiliary layers are provided with a binder before they are joined. Method according to claim 9 or 10, characterized in that the bonded auxiliary layers are compressed longitudinally in front of the bonding station. 12. A method for continuously manufacturing bonded mineral fiber plates, in which the fiber felt is pre-compressed in a thickness direction to a thickness of 1 to 3 thicknesses of the finished product, and then subjected to longitudinal compression using at least two pairs of conveyors driven at different speeds to form longitudinally compressed and then bonded in the bonding station (25) to a bonded mineral fiber board, characterized in that the thickness of the felt in the longitudinal compression stage and, respectively. upstream of the bonding station is about 0.9 to about 3 thicknesses of the final product, wherein the longitudinal compression is performed substantially without compression to a thickness, wherein the longitudinal compression is performed to 0.5 to 0.1 of the original length, which compression is performed in a continuous a compression zone, and the felt is held to prevent tearing between the longitudinal compression unit (19, 19 ') and the coupling station (25). 13. The method of claim 12, wherein the thickness of the felt in the longitudinal compression region is substantially the same as the thickness of the felt. nominal thickness of the final product. -3414. An article comprising a fiber board produced by the method of the preceding claims 1 to 13. Apparatus for the continuous manufacture of bonded mineral fiber webs of fibrous web, comprising transport means (19, 40; 19, 23) for conveying a web to a bonding station (25), from a web compression device (17), longitudinally a compression device 19; (19) a web arranged downstream of the web for compacting the web, from the web joining station (25), and from means (59, 61; 40, 42) to prevent web breakage between the longitudinal compression unit and the web station (25); characterized in that it is provided with at least two roller conveyors (30, 32) arranged one after the other in the conveying direction, wherein each roller conveyor (30, 32) always consists of two opposing groups of at least two rollers, said opposing groups being arranged to forming a conveying path (F) for the web, further provided with drive means for driving the rollers (39) of each group at substantially the same peripheral speed, further provided with means for controlling the peripheral speed of the rollers (39, 39) of each individual group independently of the roller speed of all other groups, and means for adjusting the distance between the opposing groups (30, 30) 32, 32) conveyors (30, 32) independently of the roller distance of the other conveyors. Apparatus according to claim 15, characterized in that it is provided with two roller conveyors (30, 32) arranged one after the other in the conveying direction (F). -3517. Device according to claim 15 or 16, characterized in that each group of rollers consists of two to eight rollers, in particular of four to six rollers arranged one behind the other. . Apparatus according to any one of the conveyors (30, 32) to 17, wherein at least one of the means for claiming is thereby provided with a tilt of at least two opposing groups of rollers with respect to each other, for example to produce a web of tapering in the conveying direction (F). . 20th Apparatus according to claims 15 to 18, characterized in that the roll diameter and the distance of the rollers (39) in the conveying direction are such that substantially any breakage or ripple of the web is prevented. s Apparatus according to claims 15 to 19, characterized in that the diameter of the rollers is less than 180 mm, in particular 60 to 160 mm, and in the most preferred embodiment 80 to 120 mm. 21st Apparatus according to claims 15 to 19, characterized in that at least the first conveyor (30) is provided with means for adjusting the conveying path in the conveyor relative to the position of the conveying path in the next conveyor (s) (32). . Apparatus according to claim 32, characterized in that they are arranged horizontally. to 21 that the conveyors (30, -3623. . Apparatus according to claims 15 to 21, characterized in that a separating device (41) is arranged between the roller conveyors (31, 33, 35, 37) and the coupling station (25) for separating the web into two auxiliary layers, the device being provided with at least one compression stage (53, 54) for the thickness and / or longitudinal compression of the at least one nonwoven web, and further provided with conveyors (56, 61, 63, 65) for holding the nonwoven web and the auxiliary layers on the path to the coupling station (25) to prevent any deformation or tearing thereof in the thickness direction. Apparatus according to claim 23, characterized in that the distribution device (41) and the at least one conveyor (47) are adjustable in height, so that the device can be used for the production of monolayer or multilayer products. . Apparatus according to characterized by means (57) for claim 23, characterized in that the dosing of the binder or 24 is provided on the interfacing surfaces of the nonwoven layers. . 27th Apparatus according to claims 15 to 25, characterized in that it is provided with means for independently driving the means of transport between each other between the compression stage and the coupling station and in the coupling station. Apparatus for the continuous production of bonded mineral fiber webs in which the web is precompressed, then the precompressed web is fed to a splitter - a layer (43) of a linking device (41), wherein said web (41) splits the web into two or more webs (43, 45), further compressing at least one web (45) to a thickness, further the auxiliary web (45) is joined and conveyed to the web station (25) where the web is glued, characterized in that the mineral fiber web is compressed longitudinally and / or thickness-compressed (especially longitudinally compressed) in the compression unit (19) before the splitting device (41), while tearing the stretched nonwoven webs (43, 45) between the squeezing unit (19) and the coupling station by the holding means (49, 50, 51, 59) is prevented, 61, 63, 65). 28th Method according to claim 27, characterized in that the at least one nonwoven layer (45) is compressed longitudinally. 29th Method according to claim 27 or 28, characterized in that the contact surfaces of the nonwoven layers (43, 45) are provided with a binder before they are joined. 30th 31st . Method according to claims 27 to 29, characterized in that the bonded layers (43, 45) are compressed longitudinally before gluing. Method according to claims 27 to 30, characterized in that the distributor device (41) is continuously cleaned. Method according to claims 27 to 31, characterized in that the web is longitudinally compressed before -38distribution in continuous stages, in thickness. by means of a device in a compression unit, a compression zone or in a compression substance without simultaneously pressing on Method according to claims 27 to 32, characterized in that the web is pre-compressed to approximately 0.8 to 1.5, in particular 0.9 to 1.3 times the nominal thickness of the finished material before entering the compression unit (21). product. 34th Method according to claim 32 to 33, v y z n a č u j ú c i by that squeezing the carried in one degree. 35th Method according to claims 27 to 34, v y z n a č u j ú c i wherein the web is compressed to approximately the nominal thickness of the final product at the latest by the last conveyor. A method for continuously producing mineral fiber boards having two or more layers of different density by pre-compressing the fibrous batt, wherein the pre-compressed batt is fed to a distributor device (41), whereby the batten is divided into two or more by the distributor device (41). and at least one layer (45) is compressed to a thickness auxiliary layers (43, 45 ') combined and transport sa ke connection station (25) , where Be felt. glues, characterized ú c i s a t ý m, that fibrous felt is in front of the distributor device (41), longitudinally compresses in the compression unit (19), without simultaneously compressing to a thickness, in the continuous compression region where -39 maintains the nominal thickness of the article, while preventing the tensile auxiliary layers (43, 45) from tearing between the compression unit (19) and the coupling station by the retaining means. Apparatus for the continuous production of bonded mineral fiber webs, comprising means (27, 29) arranged one after the other in the conveying direction (F) for pre-compressing the web, from the first web means (19) for conveying the web to the splitter device (41), from a splitting device (41) for splitting the nonwoven into two or more nonwoven layers (43, 45), from means for compressing at least one auxiliary layer (45) of the fleece of the conveying means (23) of the auxiliary layers (43, 45) to the thickness of the second for successive joining and their conveyance to the joining are formed by a compression unit from at least two pairs of conveyors (31, the web where the web is bonded) to the joining station (25) for bonding the web, characterized by by the first means of transport comprising 33, 35, 37) arranged one after the other in the conveying direction, the device further being provided with holding means (49, 50, 51, 61, 63, 65) to prevent the stretched nonwoven layers (43, 45) from breaking between the compression unit (19). ) and the connection station. Apparatus according to claim 37, characterized in that it is provided with means (57) for providing the nonwoven layers with a binder prior to reconnecting them. The apparatus of claim 37 or 38, Characterized in that the splitting device (41) consists of a band knife or a band saw. 40. Device characterized by cleaning mouth cleaning belt ^- ' according to the swarm of the creature knife claims by i for continuous or crawler 37 in from aleb saw. to 39 is provided with intermittent 41st equipment by claims 37 up to 40, .... j ú c e is that that at least one distributor system (41) and next The holding system (49) They are vertical adjustable in area multiple unit (21). 42. equipment by claims 37 to 41, .... j ú c e by that for production essentially corrugated products is a distance opposed conveyors from a pair conveyors (31, 33, 35) adjustable l approximately on the 0.5 to 0.1 the distance of the conveyors of the next pair of conveyors (33, 35, 37), the conveying path defined by the two pairs of conveyors being substantially aligned in line. 7/7 13a ^{31 33 35 37} —F. 13b. --F 13e