SK128598A3 - Process and apparatus for the production of a mineral fibreboard - Google Patents

Abstract

An apparatus for the production of single-ply or multiply boards comprises a collecting belt (15) for receiving a fleece (20), a precompression stage (17) for compressing a fleece (20), a compression unit (19) having conveyors (31, 33, 35, 37) each comprising two opposite roller groups comprising two or more rollers for longitudinal or longitudinal/thickness compression of the fleece, a multi-ply unit (21) for forming layers of different densities and a curing oven (25) for fixing the compressed fleece. Compaction is preferably effected by longitudinal compression, and preferably there is no further thickness compression after the compression unit (19). The boards made on the apparatus can be pleated but generally have a substantially random fibre orientation, the fibres being arranged in a corrugated pattern, and good mechanical properties such as high tread, compressive, piercing and tensile strength for comparatively low density.

Description

Method and Equipment for Manufacturing; mineral heater B-plate boardsTechnical field

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 so that the fibers are aligned predominantly perpendicular to the main surfaces of the board. As a result, it is possible to increase the compressive and tensile strength perpendicular to the plane of the slab.

The manufacture of corrugated products is known. The corrugated products are manufactured, for example, in the manner described in EP 365 826, wherein the web passes under parallel longitudinal compression between rows of rollers spaced apart. The spacing of the rollers in the longitudinal direction is large enough to allow a substantial upward movement of the fibers between the rollers, and the overall method leads to the undulation.

It is known that it is generally more desirable to perform longitudinal compression substantially free of corrugations.

Such a method is described in DE 16 35 620. The web is here compressed in detail to a thickness and then subjected to longitudinal compression between the strips, under conditions where the thickness of the web after longitudinal compression is approximately equal to or slightly higher than the thickness before longitudinal compression.

In many methods involving longitudinal compression, the longitudinally compressed web has to be subjected to compression to a thickness immediately prior to joining. In EP 133

For example, methods are described wherein substantial longitudinal compression is performed, the web is then subjected to compression to a thickness, and the web is then bonded.

Other embodiments of longitudinal compression, substantially free of undulations, are described, for example, in US 4,567,078, WO 91/14816 and WO 94/16164.

These methods are usually carried out using belt conveyors to effect longitudinal squeezing, where the web passes between one set of belt conveyors and then passes through a set of slow moving conveyors. EP 133 083 specifically recommends the use of belt conveyors rather than rollers, since the rollers tend to become clogged. Therefore, methods for achieving significant longitudinal compression between sets of rollers usually have the disadvantage that a plurality of fibers move between the rollers and cause them to become locked and deformed and make the manufacturing process unsatisfactory. WO 91/14816 and WO94 / 16164 disclose a combination of belt conveyors and rollers. It is stipulated that all rollers should rotate at the same speed.

The known methods usually have the disadvantage of causing difficulties in alignment and efficient operation. Furthermore, they tend to create a further disadvantage that only corrugated products or products with an isotropic fiber orientation can be produced.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an apparatus and method that allows the manufacture of articles having improved properties. In particular, the aim is to further improve the efficiency of the method for producing mineral fiber boards, i.e., products with specific physical properties such as improved strength, compressive and tensile strength, and improved insulation properties.

-3 values, they can be produced with less use of raw materials. The products should have as homogeneous density as possible.

Another object of the invention is to provide a device in which the critical compression and other working steps can be easily adjusted without dismantling the device, depending on the changes of the web being fed into the device or the changes of the desired product. In this method, it would not be desirable to be able to produce articles on a single device having a full range of different physical properties, without any undesirable downtime or other disadvantages, between one and the second stage of manufacture.

It should also be desirable to produce products with random fiber orientation and, if possible, also products with a corrugated structure, in one setting.

This object is achieved by a new apparatus for the continuous production of bonded mineral fiber webs consisting of a fiber production unit for the production of a web, a conveying means for transporting the web to a splicing station, a splicing station for joining a web, a compression unit for and / or longitudinally squeezing the web positioned between the fiber production unit and the coupling station and means for preventing the web from tearing between the fiber production unit and the coupling station, according to the invention, wherein the compression unit is provided with a series of pairs of conveyors wherein each pair of conveyors consists of two opposing rollers, provided with at least two rollers arranged at a distance from each other so that the web conveyor path is formed by these opposing rollers, each roll having a diameter 60 to 160 mm, in particular 80 to 120 mm, wherein the distance between adjacent rollers is selected to substantially prevent the fibrous felt from slipping, wherein the compression unit is further provided with drive means for driving the rollers

Each group has substantially the same peripheral speed, further provided with means for individually adjusting the peripheral speeds of the conveyor pairs and means for adjusting the distance between the opposing groups of rollers of the conveyor pairs.

The invention further encompasses an apparatus for the continuous production of bonded mineral fiber sheets of mineral fiber felt or mineral fiber web, comprising a fiber production unit for the manufacture of felt, a conveying means for conveying the felt to the bonding station, a bonding station for bonding the felt, or an underlay and thickness compaction unit disposed between the fiber production unit and the coupling station and means for preventing web breakage between the fiber production unit and the coupling station, the principle being that the compression unit is provided with a series of conveyor pairs, each conveyor pair consisting of two opposing rollers or groups of rollers, each roll having a diameter of 60 to 160 mm, in particular 80 to 120 mm, wherein the distance between adjacent rollers is selected to substantially prevent slippage of the fibrous batt; means for individually adjusting the peripheral speeds of the conveyor pairs and means for adjusting the clearance between the opposing rollers of the conveyor pairs.

The invention further encompasses a method of continuously manufacturing bonded mineral fiber sheets made from a mineral fiber web, wherein the web is longitudinally and / or thickness compressed, then the longitudinally compressed web is joined at a bonding station, holding the web between the compression unit and the bonding station its rupture, the essence of which is that the web is compressed longitudinally by passing through a compression unit provided with a series of pairs of conveyors arranged one behind the other in the conveying direction,

5-rollers, substantially coupled speeds, wherein each pair of conveyors consists of two opposing rollers, provided with at least two rollers spaced apart so that the web conveying path is formed by these opposing groups, the rollers of each group being driven at the same peripheral speed the peripheral speed of the rollers of the at least one conveyor pair is lower than the peripheral speed of the rollers of the previous or each previous pair of conveyors, adjusting the distance between the opposing roller groups of the conveyor pair.

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 therefore a suitable means must be used to force the non-rupture of the web (ie bulging outside the support device) when conveyed between the longitudinally compressed unit. connecting station. The means may be a belt, rollers or other guide that will adequately limit the longitudinally compressed web in the desired longitudinal path and prevent the web from being significantly deflected from the desired path.

Although there is a clear attempt in the literature to consider roller conveyors and belt conveyors as potentially suitable for achieving similar results, but the disadvantage that roller conveyors may clog and tend to corrugate the web, it has surprisingly been found that the use of a compression unit provided with a series of successive roll groups, each group having two or more rollers, as indicated in the invention, allows both easy adjustment and production of products with significantly better properties. Unlike known longitudinally and vertically compressed products, the new products differ

-6 particularly homogeneous density. The fibers are uniformly felted 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 arranged in a partially wavy pattern. However, this device can also be used to produce corrugated products.

In contrast to the device in EP-A-0 365 826, no idle intermediate stage is used and no gradual bulging is desired. In no case is it necessary to continuously increase the speed, as disclosed in WO 91/14816. Conversely, the rollers may be joined into groups of rollers consisting of two or more rollers, where the rollers are driven at the same speed. In contrast to WO 91/14816, the opposing groups of rollers are in particular arranged parallel or, in some cases, inclined relative to one another, so that they taper in the conveying direction.

It has been found that since there is low adhesion and some slippage through the pipes, it is possible for the web to slide on the rollers during compression. Under these conditions, the web is perfectly fused over a certain distance, i. repeatedly expands and compresses. This effect is believed to be a reason for a marked improvement in the achieved properties of the product.

It appears that an important feature of the present invention is that the web or fiber batt is subjected to optimization, more particularly by longitudinal or longitudinal thickness compression, by means of a series of rollers or rollers. In the device according to the invention, the pressing of the fibrous batt can be carried out gradually, and over a further distance, such as in a belt conveyor. In these circumstances, the squeezing of the fibrous felt appears to be significant over a reasonable distance. The fibrous felt is permanently adhered perfectly in the compression zone when the forming reaches the fleece between the rollers during the operation

-Compression, and it has a positive effect on the overall micro-density.

The products produced by the device according to the invention have a surprisingly high homogeneous overall micro-density (mass distribution in a small volume unit) and very good mechanical properties such as compressive and tensile strength and puncture resistance at a lower weight of 15 to 25% than conventional products so that raw material resources can be saved as much as possible.

The diameter of the rollers and their spacing in the conveying direction is usually such that any undesirable ripple of the web and / or clogging of the fibers between the rollers is virtually impossible. Products with a corrugated type structure can be obtained by a series of compacting rollers comprising relatively small diameter rollers. The dimensions and spacing of the rollers required to produce the corrugated fiber structure depends, inter alia, on the type of fiber and the length of the fiber. The diameter of the rollers is preferably about 60 to 160 mm, in particular 80 to 120 mm. The distance between adjacent rollers is preferably chosen such that any slippage of the fibrous batt is not possible. The distance between adjacent rollers is therefore 1 to 50 mm, more preferably about 2 to 30 mm, and most preferably less than 20 mm, for example 3 to 10 mm. The allowed roll distance depends essentially on the fleece density, the degree of longitudinal compression on the compression unit and the plate thickness during manufacture. The diameter of the rollers is preferably about 90 mm and the axial spacing of two adjacent rollers is about 95 mm. Products of varying thickness and high density can be produced using small spacing rollers.

Although, for example, three to ten pairs of roller conveyors may be used, each having 2 to 10 rollers, preferably three to six pairs of roller conveyors, with groups of rollers, of four rollers each may be used. Although the use of four pairs of conveyors, with groups of rollers of four rollers, allows one

8 or multiple gradations of speed, improved product properties can be achieved in many cases by easier single-step longitudinal compression. Thus, a sufficiently long compression region becomes available by using four pairs of conveyors.

The conveyor pairs are preferably height adjustable independently of one another. In a particularly preferred embodiment, the position of the opposed roller groups of the at least one conveyor pair is individually adjustable relative to the position of the roller groups of the next pair or successive pairs of conveyors. Thus, unlike known devices, it is possible to produce not only products with a random fiber orientation, but such products with a corrugated fiber structure. For the production of substantially corrugated products, the distance between the opposing roller groups is preferably a pair of conveyors adjustable to approximately 0.5 to 0.1 of the distance of the roller groups to the next pair of conveyors, and the conveying path defined by the two pairs of conveyors is arranged substantially approximately aligned.

Although, as a rule, the roller groups of a pair of conveyors can be driven at the same peripheral speed, it may be advantageous to control the roller peripheral speed of each individual group independently of the roller speed of each other group and to create a separate variable drive.

The compression unit is preferably provided with a support structure on which pairs of conveyors are located. The support structure makes the compression unit a compact structure. The compression unit can also be subsequently installed in prior art systems. The roller groups of the at least one conveyor group are arranged on a support structure, each of which is displaceable perpendicular to each other perpendicular to the conveying direction. The advantage of this arrangement is that it enables, among other things, the production of corrugated products.

-9a pod. To create or more spindles join and distance adjustable.

In a preferred embodiment, the at least two groups of rollers are arranged on a separate frame which is adjustable on the support structure perpendicular to the conveying direction. This simplifies the design and control of the compression unit. The frame is preferably rotatably mounted on the support structure. This allows simultaneous thickness and longitudinal compression. The individual adjustment is preferably made by means of spindles. It is also possible to use a toothed rack and a pinion, the helical gear wheels of the parallel drive can be two with a shaft, and thus the number of required drives is reduced.

The peripheral speeds of at least the pairs of conveyors of the opposite conveyors are individual. The conveying means for the conveyors and the means for adjusting the distance between the conveyors are preferably connected to a microprocessor control system. In a particularly preferred embodiment, the microprocessor control system is provided with at least two read and input units, each located in the region of the compression unit and the other, for example in the control room. In this way, the manufacturing process can be optimized on site or interventions in the manufacturing process are possible. The microprocessor control system may be provided with a memory means for storing production parameters, such as speed and distance of the conveyors, so that products tailored to customer requirements can be repeatedly produced at any time.

Advantageously, a means, such as an isotope system, for determining the amount of fibers per unit area may be provided upstream of the compression unit. The means for determining the amount of fibers may be coupled to the fiber production unit or microprocessor control system so that the amount of fibers per unit area can be controlled and uniformly arranged.

According to a particularly preferred embodiment, a separation device for separating the web into two or more nonwoven layers is provided between the compression unit and the coupling station, and the apparatus is further provided with a compression stage for the thickness and / or longitudinal compression of the at least one nonwoven layer, and provided with conveyors. to prevent the compressed fleece from tearing between the compression unit and the coupling station. This device can produce multi-layer products. The compression stage for compressing the at least one nonwoven web preferably comprises at least two independently driven conveyor pairs. Thus, longitudinal compression can also be performed in addition to the thickness compression.

Preferably, the at least two manifolds and the subsequent conveyor are vertically adjustable in the region of the multilayer unit. This has the advantage that the device can be used both for the production of monolayer products and multilayer products.

Although the adherence of the nonwoven web layers is normally satisfactory due to the curing of the binder adhered to the fibers, the device may be provided with a means that applies the binder to the interface surfaces of the nonwoven web layers prior to bonding. In principle, the bonded layers of the web 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 dimension of the abutment surfaces can be increased by a final longitudinal compression so that the bonding of the web layers is improved.

The device may be used to produce corrugated or corrugated products. In a preferred variant of the method for producing substantially corrugated products, the distance between the opposed rollers of the conveyor pair is set to 0.5 to 0.1 of the roller groups of the following pair.

Also, at least one tilt relative to the conveyors, wherein the conveying path defined by the pairs of conveyors is substantially aligned in line and the peripheral speed of the next conveyor is the speed of the previous conveyor, from roller conveyors to the conveying direction, e.g. in the transport direction. This may be important in the manufacture of products with a density of less than approximately 11 kg / m ³ .

The nonwoven prior to entering the compression unit is preferably pre-compressed to approximately 0.8 to 1.5, in particular 0.9 to 1.3 times, and in particular to an approximately nominal thickness of the finished product so that only longitudinal compression by a roller conveyor takes place. The thickness setting set is only related to the distance between opposing roller groups. In particular, there is no thickness compression before the curing oven, so that the fibrous structure that has already been adjusted is maintained. In a preferred embodiment, before entering the curing oven, and in the compression unit, the web has a nominal thickness corresponding to 0.9 to 1.3 times , and in particular approximately to the thickness of the finished product. The products produced in this way have very good tensile and compressive strength at a comparable lower weight.

Although the speed can be repeatedly increased in the conveying direction, most products with random fiber orientation can be produced with a single speed. The mineral fiber web is compressed in length at a factor of 2 to 6, in particular 2.5 to 5, and in a particularly preferred embodiment 2.5 to 3.5. Only in the case of products having a density of less than about 90 to 100 kg / m ³ , a multistage speed step may be preferable to a single-stage. In particular, the degree of compression to the thickness in the compression unit is less than 2, and in particular less than 1.5. Before entering the bonding unit, for example a curing oven, the web has a nominal thickness of about 0.9 to 1.3 of the thickness of the finished product.

For the manufacture of corrugated fiber products, the distance between the opposing roller groups of the conveyor pair is set to approximately 0.5 to 0.1 of the distance between the successive roller groups, the conveying path defined by the two conveyor pairs being substantially aligned in line and the peripheral speed of the following of the roller groups is less than the peripheral speed of the previous roller groups.

In a particularly preferred variant, the web is expanded in the conveying direction after longitudinal compression. Unwanted corrugation of the web, for example when transferred to a splicing station, can be prevented by stretching the compressed web. The pressure belts that are otherwise required may, in some cases, be partially or completely omitted after release. In many cases, a release of 20% to 40% is sufficient. The release may be important for relatively thin products of high density, for example more than 140 kg / m ³ .

shifts the compression of conveyors

In another variation of the method of manufacture, the compression region at certain intervals, for example longitudinally, is carried out by a changing pair. In this way a certain self-cleaning effect can be achieved by slipping between the rollers and the fleece, so that the rollers are cleaned of any adhesive binder.

The web may consist of glass wool, mineral wool or other synthetic fibers. The web consists mainly of chemical glass fibers, in particular mineral fibers, and contains an uncured binder. The binder content by weight may be about 0.7 to 7%, often 1 to 4%. In particular, the binder is curable in a curing oven. However, the bonding of the web may 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.

Preferably mineral fibers of average size are used

-13 lengths of about 0.3 to 50 mm, in particular 0.5 to 15 mm, and thicknesses of about 1 to 12 µπ, in particular about 3 to 8 µπ. 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 μπι, in particular about 3 to 6 or 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 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 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 swinging belt adapted to rock at an angle to the conveying direction. Thus, the web is primarily formed by cross-lapping. 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 mineral fiber plates produced by the method of the invention, in particular to plates having a corrugated fiber structure. The invention also includes an apparatus for carrying out the described method and comprises at least one collecting web for storing fibrous felt, a pre-compression stage for compressing the fibrous web.

-14 felts, of at least two conveyors placed in series, driven at different speeds for longitudinally or longitudinally compressing the fibrous batt and of a curing furnace for reinforcing or longitudinally compressed fibrous batts, the essence of which comprises an optimization unit consisting of conveyors; each of which is provided with two opposing roller groups so that, during operation, a continuous or quasi-continuous compression region is formed passing through a series of rollers or roller groups, the roller diameter preferably being about 60 to 160 mm, in particular 80 to 120 mm and the distance between adjacent rollers is chosen such that any slippage of the fibrous batt is not possible.

Overview of the figures in the drawing

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 two-layer product whose upper layer has an increased density; Fig. 4 shows a product of substantially homogeneous density and randomly oriented fibers; Fig. 5 shows an article where a randomly oriented fiber layer is combined with an increased density layer; Fig. 6 is a diagram showing the principle of machinery for the continuous production of multilayer fiber boards of varying density, where Fig. 6a) is a machine 6b) is a one-stage operation; FIG. 7 shows a detail of the compression unit; FIG. 8 shows a side view of the compression unit of FIG.

FIG. 9 is a plan view of the compression unit of FIG. 8; FIG. 10 illustrates a fracture region where FIG. 10a) illustrates this region of a board having substantially parallel oriented fibers; and FIG. 10a) and 10b) for mineral wool slabs produced in a novel manner and spaced apart from each other, perpendicular to the plane of the slabs, FIG. 11 is a perspective sectional view of a two-layer slab, the fibrous structure of which is shown on an enlarged scale; schematically illustrated various 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 can be bent and can 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 they can be noticeable in the plate

-16 Deviations in density.

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 may be reduced.

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

The apparatus 11 shown in FIG. 6 for producing mineral fiber plates consists essentially of a pendulum belt 13 and a collecting belt 15 for the respective storage and take-up of the fibers produced by the fiber production unit, in a sequential arrangement in the conveying direction F. (not shown in detail) and from the preliminary compression stage 17 and from the optimization or compression unit 19 for forming the web 20 with optimized fiber orientation and homogeneity. An optional multiple unit 21 is provided downstream of the web compression optimization unit 19, which may be used to produce multi-layer mineral fiber boards. Downstream of the multiple unit 21 is a conveying device 23 which keeps it pressed

The web is clamped in opposing main surfaces and fed to a coupling station, such as a curing oven 25.

Said fiber production unit is used for the continuous production of fibers in some known manner, for example in a cascade spinning process. A binder (not shown) is sprayed onto the made-up fibers, also called a primary web, and are fed by a conveyor belt (not shown) onto a rocking belt 13. This belt is located above the collecting belt 15 and swings transversely to the conveying direction of the collecting belt 15. However, a different orientation of the rocking movement is also possible, for example in the conveying direction. As a result of this rocking movement, as is clear from FIG. 6, the primary web 26 is deposited in layers on a collection belt 15 moving forward, depending on the belt speed and the frequency of rocking movement. However, it is also possible to use other means, for example gas nozzles, to make the fiber orientation on the collecting strip as irregular as possible. Due to the forward movement of the collecting belt 15, the fibers are oriented predominantly at an angle to the conveying direction. When viewed from above, the fibers of the two webs laid on top of each other extend substantially transversely.

The pre-compression stage 17 consists of a lower conveyor belt 27 and a pressure belt 29. The pressure belt 29 is adjustable in height so that the primary web 26 can be pre-compressed in various stages. The pre-compression stage stage 17 forms a pre-compression and some homogenization of the relatively thin web 20 prior to its introduction into the compression unit 19. The two belts 27 and 29 are preferably independent of each other so that they can be driven at different peripheral speeds.

According to the illustrated embodiment, the compression unit 19 consists of a series of conveyors or pairs of conveyors 31. 33. 35. 17. Each pair 31. 33. 35. 37 consists of a lower group 31. 33 '' 35. 37 rollers and from the upper group 31 '. 33 '. 35 '. 37 ', rollers of which

-18 Arrangement of adjustment by roller groups each group consists of four rollers 39. Clearance between groups 31. 33. 35. 37. and 31 '. 33 '. 35 ', 37', the rollers are adjustable. The roller groups are thus adapted to tilt relative to each other, especially in the conveying direction. This feature allows the web 20 to be continuously compressed to a thickness because it is released as it passes through a pair of conveyors 31, 33, 33, 37.

Many different fleece optimizations can be achieved as a result of the distance between opposites and speed settings. Thus, completely different product properties can be achieved. Also, due to the possibilities of these adjustments, the fiber structure can be controlled to optimize, for example, unwanted undulations of the fleece surface can be avoided.

At least one lower roll group 31 '' and one upper roll group 31 'of the first pair of conveyor 31 are independently height adjustable. This allows the web to be subjected to bending as shown in FIG. 6, for example, to smooth the compaction of the web surface. A particularly interesting variant of this method can be achieved, for example, by adjusting the spacing of the roller groups 31 'and 31 of the first conveyor 31 to approximately 0.6 to 0.1 of the distances of the following roller groups 33' and 33 ''. 31, 33 is aligned to the row (FIG. 12f, axis 69). If the speed of the next pair of conveyors 33 is lower than the speed of the pair of conveyors 31, it is possible to make a product with a corrugated fibrous structure, wherein the undulation is performed between the conveyors 31 and 33.

Each upper and lower group 31'.31: 33 '. 33: 35 '.

35; 37 ', 37 of the rollers of the conveyor pairs 31. 33, 35, 37 has a separate drive which is not shown in detail in FIG. In particular, the actuators used are infinitely variable to a certain extent, such as, for example, the upper and lower groups

-19 rollers can 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.

7 to 9 show an exemplary embodiment of a compression unit 19 where conveyors with groups 31 '. 31 '': 33 '. 33. · 35 '. 35; The rollers 37 ', 37 provided with rollers 39 are arranged on a support structure 71. At one end of each roller 39 sprockets 115 are arranged. Four or five rollers 39 are each connected 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

Upper and lower group 31 '. 31 of the rollers of the first pair of conveyor 31 taken in the conveying direction (arrow F in FIG. 8) is 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, 77 '.

For vertically adjusting the lower pair of conveyor 31, a drive member 83 is used which drives the spindles 75, 75 'by means of cardan shafts 79, 79'.

Unlike the first Group 31 '. 31 of the rollers, the position of the remaining roll groups is either not adjustable or only adjustable together (for the upper group). As is clear from FIG. 7 and 8, the three rear lower groups 33, 35. The 37 rollers taken in the conveying direction are supported on the fixed frame 85, while the three upper groups 33 '. 35 '. 37 '. The 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 provided by a drive member 103 which, by means of a cardan joint

-20 shafts 99. 99 '. 101. 101 '. drives the spindles £ 2, 89 '. 91. 91 'arranged in pairs on the support structure 71.

Upper groups 33 '. 35 '. 37 'of rollers, the last of which has five rollers 39, located on the support rails 105. pivotally connected to the adjustable frame 87. the pivot pin 107. In the illustrated embodiment, the front end of the track 105, taken in the conveying direction, is connected to the adjustable frame. 87 by another pair of spindles 109, 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 '. so once again one drive 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 according to FIGS. 12b and 12c cannot be performed by the compression unit according to FIGS. 7 to 9. The arrangement of the groups 31 ', 31. 33 '. 33 '' 35 '. 35. 37 '. The rollers of Fig. 12d are suitable, for example, when light products are to be produced. In the arrangement of the groups 31 '. 31. 33 '·. 33. 35 '. 35. 37 '. 37. of the rollers of FIG. 12f it is possible, for example, to produce solid corrugated fiber structures or a fiber web.

An optional multiple unit 21 is provided downstream of the compression unit 19 comprising a series 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. 6, for separating 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 auxiliary layers 43 and 45 of the web to a thickness. Any gaps arising from geometric reasons

Between the distribution device and, for example, the conveyor belt 49 or 50, they can be bridged, where possible, with guide plates. In this way, the rupture of the fleece layer 43, which is compressed in different degrees, is prevented.

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 splitting device 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 holding 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.

A pair of conveyors 53, 54 arranged downstream of the conveyors 50, 51 serve to compress to the thickness and longitudinally compress the top web 45 of the web. In particular, the pair of conveyors 51, 54 is provided with rollers 55 which in each case are connected to form an upper and a lower group of rollers, each with three rollers. The pair of conveyors 53, 54 are configured to be driven at different peripheral speeds, so that the elongation that may occur as a result of compression to the thickness is followed by 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 means of conveyor belts, it can compensate for the distance between

-22 slides 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 meet, the nonwoven is provided with a binder dispensing device. With this arrangement, it is possible to apply the binder to the contact surfaces of the upper auxiliary layer 45 'and the lower auxiliary layer 43 of the web so as to achieve 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 co-compressed 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 individually adjustable so that the compression or release of the compressed webs 43 and 45 'can be performed as desired. In particular, at least the feed rollers 63, 65 can be cooled. Conveyor belts 67, 67 'are provided in the curing oven 25. which are permeable to air. The conveyor belts 67, 67 'hold the layers 43 and 45' together during the curing process, thereby substantially defining the nominal thickness of the finished slabs. The conveyor belts 67, 67 '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 With an average thickness of 15 to 20 mm, often up to 75 mm, it is fed to the rocker

-23 belt 13. This belt stores the web on the collecting belt 15, which moves continuously forwards. Depending on the speed of the collecting belt 15 and the oscillation frequency of the pendulum belt 13, a greater or lesser 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. on a single fiber processing state between the fiber processing unit and the curing oven. Typically 2 to 40 to 50 layers are deposited on the collecting belt 15.

Placing the primary web 26 with the swivel belt 13 not only creates a good transverse distribution of the fibrous material on the collecting belt 15, but also contributes to a uniform orientation of the fibers and to some homogenization thereof. Further, the orientation of the fibers can be controlled by changing the direction of movement of the rocker belt.

The deposited web is subjected to pre-compression in the pre-compressor stage 17. Pre-compression is typically performed so that the web can still be clamped by the rollers of the first pair of conveyors (nominal thickness plus a maximum of about 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 the longitudinal compression is usually required to produce 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

-24 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 other 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 are running somewhat slower than the first pair.

In particular, longitudinal compression in a ratio of 2: 1 to 6: 1 (depending on the peripheral speeds of the first and last pairs of conveyors 31 and 37) is performed in the optimization or compression unit 12, from the roller distance substantially corresponding to the nominal board thickness (i.e. without compressing to thickness). Although the speed grading can be multistage, the desired properties can be by one-step longitudinal compression.

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

The rollers 39 have surprisingly proved to be particularly suitable as means of transport. The web can be longitudinally compressed longitudinally by means of rollers 12, 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 reorient the fibers, since the web between the rollers may somewhat increase in volume, but in any case usually reach in the case of lighter

-25 without ripple. The result is a good compaction of the fibrous web inside and on the surface.

In the multilayer unit 21, the compressed web may be divided into two or more auxiliary layers 43. 45. It is also possible to omit the multilayer 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.

The compressed webs 42, 45, in particular the lower stretched layer 43, are guided between the compression unit 19 and the curing oven 43 are guided between the compression unit 19 and the curing oven 25 by conveyors 47, 49, 59, 61, 63, 65, e.g. 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 about 200 to 150 ° C. The binder also provides a firm bond between the low and high overall density layers 42, 45 of the web.

To improve the adhesion of the web layers 42, 45 ', a solid or liquid adhesive (dispensing device 57) may be applied to their interface at a multilayer unit prior to joining them.

Alternatively or additionally, the bond between the webs 42, 45 may be improved if the webs somehow contract before entering the curing oven 25.

At the degree of shrinkage, it may result in some corrugation of these layers. As a result of the shrinkage, the size of the contact area is increased and thus the adhesion / felting of these layers can be improved.

The device according to the invention can be used for single-stage and multi-stage longitudinal compression of the mineral fiber web. Alternatively, the device may also be operated to form a continuous compression region. Thus, products having a density of approximately 40 to 200 kg / m ³ can be produced.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

Board type:

Fibrous material:

Board thickness:

Outer layer thickness:

Substrate thickness:

Average total density:

Average total density of the outer layer: Total density of the base layer:

Coupling:

Average fiber length:

Average fiber diameter:

Preloading:

two layers of mineral wool

100 about mm 20 mm about 80 mm about 90 kg / m 155 kg / m ³

kg / m ³ modified phenol resin 0,5 to 10 mm 3 to 6 μπι approximately 1,5 nominal thickness

Thickness compression:

Longitudinal Press:

Compressive strength at 10% deflection:

1.8: 1 to 1.1: 1 3: 1

0.25 to 0.030 N / mm ²

-27 Tear strength (layer separation): 0.013 to 0.018 N / mm ²

Example 2

Board type:

Fibrous material:

Board thickness:

Total density:

Coupling:

Average fiber length: Average fiber diameter: Pre-compression: Longitudinal compression:

single layer mineral wool

100 mm approx. 90 kg / m ³ modified phenol resin 3 to 4 mm 3 to 4 μτα approximately to nominal 3: 1 thickness

Compressive strength: at 10% deflection: 0.035 N / mm ² Peel strength: 0.020 N / 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 been greatly improved, as is evident from the highly structured fracture region (Figs. 10b-10c).

The products according to the invention can be used for any purpose intended for synthetic fibers, for example for boards 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 (11)

An apparatus for the continuous production of bonded fibrous mineral fiber webs, comprising a nonwoven fiber production unit, conveying means (19, 23) for conveying a web to a bonding station (25), a bonding station (25) to joining the web, from a web compression unit (19) for thickness and / or longitudinal compression, located between the fiber production unit and the bonding station (25), and means (61, 65) to prevent web breakage between the fiber production unit and the bonding station (25) ), characterized in that the compression unit (19) is provided with a series of pairs of conveyors (31, 33, 35, 37) arranged one after the other in the conveying direction, wherein each pair of conveyors (31, 33, 35, 37) consists of two opposing roll groups (31 ', 31, 33, 33, 35', 35, 37 ', 37) provided with at least two rollers (39) spaced apart so that the web conveyor path is formed t with these opposing roller groups (31 ', 31', 33 ', 33', 35 ', 35', 37 '', 37), each roller having a diameter of 60 to 160 mm, in particular 80 to 120 mm, the distance between adjacent rollers (39) being selected to substantially prevent slippage of the fibrous web (20), the compression unit further being provided with drive means (117 ', 117, 117', 117, 118 ', 118', 118 ', 118, for driving the rollers (39, 39 ') of each group with substantially the same peripheral speed of the pairs of conveyors (31, 33, 35, 37) and the means of distance between the opposing groups (31', 31, 33 ', 33, 35 ', 35, 37', 37,) of roller conveyor pairs (31, 33, 35, 37). -292. Device according to claim 1, characterized in that the distance between adjacent rollers in the group is 2 to 30 mm, in particular less than 20 mm. Device according to claim 1, characterized in that the diameter of the rollers is 90 mm and the central distance between adjacent rollers is 95 mm. Unit (19) of conveyors (33, 35, 37) with rollers (39), 1 to 3, characterized in that at least three pairs of conveyors (31) are provided with three groups of rollers in the number of three to eight, in particular four rollers (39). Apparatus according to claims 1 to 4, characterized in that the position of the opposing roller groups (30 ', 31) of the at least one pair of conveyors (31) is individually adjustable relative to the position of the groups (33, 35', 35, 37 ', 37) ) rollers of the next pair or successive pairs of conveyors. Device according to claim 5, characterized in that the distance between the opposing roller groups (31 ', 31, 33', 33, 35 ', 35) of the conveyor pairs (31, 33, 35) is adjustable to approximately 0.5 to 0.1 distance between groups (33 33, 35 ', 35, 37', 37) of the rollers of the following pairs of conveyors (33, 35, 37), the conveying path defined by the pairs of conveyors being substantially aligned in rows. Device according to claims to 6. Characterized in that it is provided with means for controlling the peripheral speed of the rollers (39) of each individual roller group (31 ', 31, 33', 33, 35 ', 35, 37', 37) independently of the roller speed of each of the other groups . Device according to 1 to 7, characterized in that the compression unit (19) is provided with means for tilting at least two opposing roller groups (31 ', 31, 33', 33, 35 ', 35, 37', 37) with respect to each other. against one another, for example to produce a fiber web tapering in the conveying direction (F). Apparatus according to claims 1 to 8, characterized in that the roll groups of the at least one pair of conveyors (31) are arranged on a support structure (71) for their independent displacement perpendicular to the conveying direction. Apparatus according to claim 9, characterized in that at least two groups of rollers are arranged on a separate frame (87) adjustable on a support structure (71), perpendicular to the conveying direction. Apparatus according to claim 10, characterized in that the frame (87) is rotatable on the support structure (71). Device according to claim 10 or 11, characterized in that the frame (87) is adjusted vertically by means of first spindles (89, 89 ', 91, 91') disposed on the support structure (71). -3113. claims, Apparatus according to the four first spindles (89, 89 connected by a shaft (99, 99 ', 101, 101')) 10 to 12 that is provided with 91, 91 ') which are 14. Apparatus according to claim 10, characterized in that the adjustable frames are second to 13 arranged on the vertical spindles (109, 15 Dec 109 ') to rotate the frame (71). (87) against the support structure Device according to claim 10, characterized in that the guides for vertically guiding the frame (87) on the support structure (71). to 14 is provided 16th 17. 18. 19th Device according to claims 9 to 15, characterized in that in addition to one roller group (31), the lower roller groups (33, 35, 37) are fixedly mounted on the support structure (71). Apparatus according to claims 1 to 16, characterized in that the peripheral speed of all the pairs of conveyors and the distance between the opposite conveyors is individually adjustable. Apparatus according to claims 1 to 17, characterized in that the drive means of the conveyors (31, 33, 35, 37) and the means for adjusting the distance between the conveyors are connected to a microprocessor control system. Device according to claim 18, characterized in And in that the microprocessor control system is provided with at least two combined read / input units, one located in the region of the compression unit and the other, for example in the control room. Device according to claim 19, characterized in that the microprocessor control system is provided with a memory means for storing production parameters such as speed and distance of groups (31 ', 31, 33', 33, 35 ', 35, 37', 37). ) rollers. Apparatus according to claims 1 to 20, characterized in that means, for example an isotope unit, are provided upstream of the pressing unit (19) for determining the amount of fibers per unit area. 22. The apparatus of claim 21, wherein the means for determining the amount of fibers is connected to a fiber production unit or microprocessor control system. Apparatus according to claims 1 to 22, characterized in that a separating device (41) is arranged between the pairs of conveyors (31, 33, 35, 37) and the coupling station (25) for dividing the web into two auxiliary layers, the device being provided with at least one compression stage (53, 54) for thickness and / or longitudinal compression of the at least one nonwoven web, and further provided with conveyors (47, 49, 50, 51) to prevent the compressed web from tearing between the compression unit (19) and the splice station (25). -3324. Device according to claim 23, characterized in that the at least one distribution device (41) and the following conveyor (49) are vertically adjustable in the region of the multiple unit (21). Apparatus according to claim 23 or 24, characterized in that the compression stage for compressing the at least one nonwoven layer is provided with at least two independently driven conveyor pairs (53, 54). Apparatus according to claim 25, characterized in that the pair of conveyors (53, 54) are roller conveyors, wherein the distance of their rollers is adjustable. Apparatus according to claim 57, wherein the metering contact surfaces of the auxiliary layers are provided with a nonwoven. to 26, binder is provided on Apparatus for the continuous production of bonded mineral fiber plates of mineral fiber felt or mineral fiber web, comprising a fiber production unit for the manufacture of felt, a conveying means (19, 23) for conveying the felt to the bonding station (25); a bonding station (25) for bonding the felt, from a longitudinal or longitudinal thickness compression unit (19) located between the fiber production unit and the bonding station (25) and from the non-woven fabric preventing means (61, 65). (25) characterized in that the compression unit (19) is provided with a series of pairs -34 conveyors (31, 33, conveyors (31, 33, opposite rollers 33, 35 ', 35, 37'), 35, 37) wherein each pair 35, 37) consists of two or groups of rollers (31 ', 31, 33', 37), each roll having a diameter of 60 to 160 mm, in particular 80 to 120 mm, the distance between adjacent rollers (39) being chosen for substantially preventing slippage of the fibrous web (20), further comprising means for individually circumferential speeds of the pairs of conveyors 35, 37) and means for adjusting the distance between opposing groups (31 ', 31, 33', 33, 35 ', 35, 37'), 37) roller conveyor pairs (31, 33, 35, 37). settings (31, 33, Apparatus according to claim 28, characterized in that the compression unit is further provided with drive means (117 ', 117, 117, 117'). 118 ', 118, 118', 118) for driving the rollers (39) of each group 'at substantially the same peripheral speed. A method for continuously manufacturing bonded mineral fiber sheets made from a mineral fiber web, wherein the web is compressed longitudinally and / or thicknesswise, then the longitudinally compressed web is joined at a bonding station, holding the web between the compression unit and the bonding station to prevent it from tearing characterized in that the web is longitudinally compressed by passing through a compression unit (19) provided with a series of pairs of conveyors (31, 33, 35, 37) arranged one after the other in the conveying direction, wherein each pair of conveyors (31, 33, 35, 37) consists of two opposing rollers (31 ', 31, 33', 33, 35 ', 35, 37', 37), 35 provided with at least two rollers (39) spaced apart so that the web conveying path is formed by these opposing roll groups (31 ', 31, 33', 33, 35 ', 35, 37', 37), 39) each group is driven by substantially the same peripheral speed by the driving elements associated with the associated groups, wherein the peripheral speeds of the conveyor pairs (31, 33, 35, 37) are individually controlled, wherein the peripheral speed of the rollers of the at least one conveyor pair (31, 33, 35) 37) is less than the peripheral speed of the rollers of the preceding or each previous pair of conveyors, adjusting the distance between the opposing groups (31 ', 31, 33', 33, 35 ', 35, 37', 37) of the rollers of the pairs (31, 33, 35, 37) conveyors. Method according to claim 30, characterized in that at least one of the roll groups (31 ', 31, 33', 33, 35 ', 35, 37', 37) is inclined against an opposing roll group, for example for the production of a web, which narrows in the transport direction. Method according to claim 30 or 31, characterized in that the web is compressed by a compression unit (19) to an approximately nominal thickness of the finished product. Method according to claims 30 to 32, characterized in that the nonwoven is pre-compressed to 0.8 to 1.5, in particular to 0.9 to 1.3, and in particular to an approximately nominal thickness, before entering the compression unit. finished product. A method according to claims 30 to 33, characterized in -36s and that in the production of products with random fiber orientation the speed is one-stage. Method according to claims 30 to 34, characterized in that, in the manufacture of products having a corrugated fiber structure, the distance between the opposing groups (31 ', 31, 33', 33, 35 ', 35) of the rollers of the conveyor pairs (31). 31, 33, 35) sets approximately 0.5 to 0.1 distances between successive roll groups (33 ', 33, 35', 35, 37 ', 37), the conveying path defined by the two pairs of conveyors being substantially aligned to the row and the peripheral speed of at least the roller groups (31 ', 31, 33', 33, 35 ', 35, 37', 37) of the immediately following pair of conveyors is lower than the peripheral speed of the preceding groups (31 ', 31). The method according to claims 30 to 35, characterized in that the web is elongated in the conveying direction (F) after longitudinal compression. 37. The method of claims 30 to 36, wherein the compression region is shifted at certain intervals. Method according to claims 30 to 37, characterized in that the web is produced essentially from glass chemical fibers, in particular mineral fibers, and contains an uncured binder and the binder is cured by heating in the bonding station (25). Method according to claims 30 to 38, characterized in that it forms a nonwoven primarily by cross-lapping. -3740. Method according to claims 30 to 39, characterized in that the web is compressed longitudinally in the compression unit (19) at a compression factor of 2 to 10, in particular 2 to 6, and in particular 2.5 to 4. 41. The method of claims 30-40, wherein the thickness and longitudinally compressed web splits two or more webs of the webs parallel to the main surface, each being maintained to prevent deformation in the thickness direction of the webs. at the opposite main surface, wherein the at least one nonwoven layer of the web is compressed in the thickness and / or length direction, wherein the auxiliary layers are joined and then glued together. Method according to claim 41, characterized in that the contact surfaces of the nonwoven layers are provided with a binder prior to joining them. Method according to claim 41, characterized in that the auxiliary layers are compressed longitudinally or 42 that are joined before bonding. Mineral fiber plates produced by the process of claims 30 to 43.