EP1106743B1 - Process and device for manufacturing a fibrous insulation web - Google Patents

Description

The invention relates to a method for producing a particular single Insulation panels of mineral fibers splittable Faserdämmstoffbahn with substantially mineral fibers oriented at right angles to their large surfaces, in which the mineral fibers withdrawn from a collection chamber and on a Conveyor belt as a primary web substantially parallel to the large surfaces aligned mineral fibers are deposited. The invention further relates a device for carrying out the method with a conveyor belt for conveying a primary web of mineral fibers from a collection chamber to a Pendulum station.

Mineral wool insulation materials consist of vitreous solidified fibers, which can be classified as non-combustible insulating materials in order to maintain the elastic-springy properties, but with less than 8% by mass, with mineral wool insulation materials made of rock wool with approx 4% by mass of binders, in particular phenol-formaldehyde-urea resins are bonded. Inorganic binders, such as organic silicic acid compounds that react via sol-gel processes, are also used. Flexible, compressible mineral wool insulation materials made of glass wool have densities of less than 30 kg / m ³ . Comparable mineral wool insulation materials made of rock wool, which contain not inconsiderable amounts of non-fibrous constituents, are produced with densities between approximately 23 to 45 kg / m ³ . In addition, mechanically resilient mineral wool insulating materials, for example, for the insulation of flat roof constructions are known, the bulk densities greater than 130 kg / m ³ have. Such insulating materials can also be used in thermal insulation systems as plaster base plates.

The mechanical and thermal properties of mineral wool insulation materials are u.a. depending on the orientation of the individual fibers. Are the fibers across the large surfaces of the mineral wool insulation aligned, the insulation material is compressible. At the same time the insulating material but also a low transverse tensile strength and thermal conductivity transverse to the fiber orientation. To mineral wool insulation materials with high strength values It is necessary to produce the individual fibers predominantly align at right angles to the large surfaces. This is usually a mass flow of fibers with its horizontal and flat inclined fibers inside by a continuous horizontal compression in one area folded between 1 to 2.5 and 1 to 3 with simultaneous vertical compression.

Shearing forces acting on the pulp mass flow from outside cause an intensive Relative movement between the individual fibers or fiber layers. hereby it comes to the formation of slideways with parallel oriented Fibers within the unfolded fiber mass flow following is called primary nonwoven. Along the slideways has the primary web a reduced adhesion between the fibers or fiber layers. These Areas of reduced adhesion are preferred along the original surfaces arranged the primary web. These are fiber layers, the deducted in a small material thickness from a collection chamber and larger Stacking is done continuously. During transport and the Overlaying the primary nonwoven layers, the fibers become near the surface Reoriented zones of the primary web. In addition, the adhesiveness decreases the arranged in these areas binder drops, as it is here through the direct contact with the ambient air for a quick drying or Curing the binder comes. Furthermore, binder substance goes to the conveyor lost. In addition, rich on these surfaces of the primary nonwoven layers low binder fiber flakes and recycled fibers that form a composite weaken the fibers in this area from the outset. These weaknesses In particular, they have an effect if the insulating materials are repeated or constantly exposed to hydromechanical loads during use are.

The Auf- or Verfaltung of the fibers using the method described is in the Height limited, as with increasing thickness and increasing forces through Shaping mutual effects, such as parallel bearings to the can adjust to large surfaces. With increasing material thickness decreases also the uniformity of the structure.

An improvement of the method described above is given by that the fiber mass flow passed through a system of pulleys is, whereby the individual fibers stored horizontally in the deflection become. This additional process step has effects on the transverse tensile strength of the primary fleece. Instead of pulleys, a folding can also by moving up and down about a horizontal axis, i. commuting Transport device done. The suspended primary fleece is used as secondary fleece referred to, which is to increase its transverse tensile strength that is processed in the area of the two large surfaces of the Secondary nonwoven horizontally stored fibers after curing of the binder be separated into an area in which almost exclusively fibers are arranged at right angles to the large surfaces. at Insulating materials with a low material thickness of, for example, 100 mm must be up to be removed to 20% of the original volume in this way, a mineral wool insulation product predominantly perpendicular to the large ones Surface-oriented single fibers has.

In a further process variant, the endless fiber mass flow before Hardening furnace cut into sections, which sections subsequently to Rotated 90 °, compressed horizontally and compressed vertically by 20%. Also in this process, the fibers become underneath the large surfaces mostly horizontally stored, so that these areas to achieve optimal transverse tensile strength must be removed.

Mineral wool insulation materials produced by this process have a maximum Material thickness of about 220 mm. Since in all process variants the Unfolding in the direction of production, are the bending, tensile and shear strength transverse to the production direction by a multiple higher than in production and Verfaltungsrichtung. To high transverse tensile strength at possibly even reduced To be able to achieve gross densities, insulation boards are made of such produced mineral wool insulation parallel to the production and unfolding direction sliced according to the desired insulation thickness. This process is relatively expensive, as it is not on the actual Production line can be done, but mostly using large format Sheets as semi-finished material on separate cutting and deflection systems must be performed.

Lamella plates produced in this way, which are often used as plaster base plates in external thermal insulation systems or as load-bearing insulating layer in sandwich constructions with metal sheets or wood wool lightweight panels as cover layers, are used to achieve a high shear or joint stiffness and a high transverse tensile strength of a particularly intensive Subjected to fiber layers. The gross densities of such lamella plates are in a range between about 70 to 105 kg / m ³ .

For better adhesion of plasters or adhesives to the basically hydrophobic adjusted mineral wool insulation materials these are mostly on one or both large surfaces provided with suitable adhesion-promoting layers. The application of these funds is done by spraying, pouring, unfolding, rubbing or like. Both for the production of large-sized sandwich elements as well as the coating, it is of great advantage if the lamellar plates have much larger formats or produced as an endless sliver are.

Starting from this prior art, the invention has for its object to provide a generic method and a generic device for implementing the method to the effect that fiber insulation webs can be prepared with an intense folding of the mineral fibers in a simple and cost-effective manner, whereby the mechanical properties in the two major axes of the horizontal plane are equal or nearly equal.

The solution of this problem provides in a method according to the invention, that the primary nonwoven is divided by at right angles to the large surfaces cuts in at least two, preferably several, in particular the same dimensions having partial webs that the partial webs are then rotated by 90 ° about its longitudinal axis and that the partial webs are suspended and joined together to form a secondary web.

In the method according to the invention is thus provided that in a conventional Way produced primary nonwoven in several on a conveyor belt side by side lying sub-webs is divided, which sub-webs then by 90 ° their longitudinal axis are rotated, whereupon the partial webs to a secondary web be shuttled. It can be provided that all partial webs together be suspended to a secondary web or that individual partial webs suspended and the suspended partial webs to a secondary web be joined together.

According to a development of the invention it is provided that the partial webs of Primary fleece before turning about its longitudinal axis relative to the conveying plane one above the other to be ordered. In this method, the partial webs are after their rotation stacked around their longitudinal axis and together a pendulum device fed, which bounces the stack of partial webs to the primary web. The pendulum takes place in the horizontal direction in the conveying direction of the secondary web receiving conveyor belt.

Preferably, the partial webs and / or the secondary web during and / or compressed after flaring. In particular, the compression takes place in two substantially orthogonal directions. By laterally arranged pressure bands are the secondary web or the partial webs compressed to the desired width. The compression is preferably carried out continuously to produce a uniformly compressed product.

It is provided according to a further feature of the invention that the secondary web then fed to a curing oven to cure the binder.

It is further contemplated that on the large surfaces of the secondary web in each case a thin cover layer is separated. This is a Faserdämmstoffbahn achieved, the predominantly extent of a grain which is oriented at right angles to the large surfaces. By the Separating the cover layer before the hardening furnace achieves the advantage that less embedded fibers with hardened binder from the surfaces be torn out, so that overall a more even and even Surface of Faserdämmstoffbahn trains.

The cover layer can be before or after the curing oven from the secondary web be separated. In the cover layer, the mineral fibers are parallel to the large surfaces. If the cover layer is separated after the hardening furnace, so this results in a marketable product with pronounced laminar structure, the corresponding density, for example, for impact sound insulation can be used under floating screed.

In the method according to the invention is thus additionally provided that a commuted in a conventional manner primary web to a secondary web suspended becomes, from which then on the one hand mineral fiber plates with a lamellar structure and on the other hand a mineral fiber product with laminar fiber structure for impact sound insulation will be produced.

According to a development of the invention it is provided that the cover layer separated is before the secondary web is fed to a curing oven. At this Embodiment has the cover layer uncured binder, so that the cover layer after separation nor in terms of their material properties can be changed. In particular, the application-specific required bulk density of the cover layer by compression of the cover layer be set at uncured binder.

Alternatively it can be provided that the cover layer only after the passage of the secondary web is separated by the curing oven.

The inventive method has the advantage that over several pendulums a plurality of nonwoven layers are guided to each other, for example, a Faserdämmstoffbahn to produce, which is sandwiched. For this purpose, it is provided that the primary nonwoven fabric with one or more nonwoven layers, in particular different properties is joined together. It can therefore, for example Nonwoven layers with higher and / or lower density or with higher or lower degree of compression, wherein the joining of the different nonwoven layers before the curing oven takes place, so that the connection between the nonwoven layers in particular through the not yet cured binder is possible.

According to a further feature of the invention it is provided that the primary nonwoven is compressed before or during the pendulum. To the liability of the individual To enlarge part tracks to each other is provided that the surfaces of the Sub-webs are impregnated with binders before the sub-webs merged become.

A development of the method according to the invention provides that between adjacent sub-webs reinforcing fabric and / or nonwovens, for example Glass, carbon, metal, temperature resistant plastic and / or Natural fibers are arranged. Such fabrics can be used as reinforcement of the Faserdämmstoffbahnen serve and increase the load capacity of this Faserdämmstoffbahn produced insulating panels.

The secondary web is preferably perpendicular before and / or in the curing oven to compressed its large surfaces. In this way, a fiber insulation sheet produced with defined dimensions, without the risk of bulging the pulp in the curing oven consists.

Preferably, in the curing oven hot air is both perpendicular to the large Surfaces, as well as passed through the longitudinal sides of the secondary web to a higher efficiency of the curing oven and thus improved curing of the binder to achieve. The secondary web will also be up after hardening of the binder guided clamped on all sides.

After curing of the binder, the secondary web becomes parallel to its cut large surfaces into individual sections. This approach has the advantage that a downstream dryer for the fiber insulation in compact design can be designed. The individual sections will be stacked next to and / or on top of each other and fed to the dryer. Of course can already at this time the fiber insulation by cuts perpendicular to their large surfaces in individual plates cuboid configuration can be divided. It is also possible the longitudinal sides of the secondary web after curing of the binder for Crop education flat surfaces.

The above-mentioned, the invention is based task a generic device for carrying out the above-described Method solved in that the conveyor belt is a cutting device comprising, with the primary web in side by side on the conveyor belt lying partial webs is divisible and that the cutting device is a rotating device is connected downstream, with the individual partial webs relative to its longitudinal axis rotatable by 90 °, before entering the shuttle station to form a secondary web enter.

The cutting device has one of the number n of the required partial webs corresponding Number of n-1 saws, especially as band or circular saws are formed.

As pendulum station are preferably paired pressure belts or Roller conveyors intended for all partial webs. Alternatively, it is possible to the shuttle station as paired pressure belts or roller conveyors for each to form a partial web, so that the inventive device a the number of partial webs corresponding number of pairs arranged Has pressure bands or roller conveyors.

It is further contemplated that the shuttle station a curing oven with at least two Pressure belts downstream of which is on the large surfaces of the secondary web rest and passed through a heated gas, in particular hot air becomes.

In a further development of the device is provided that in the curing oven two further printing tapes are provided, which are on the longitudinal sides of the secondary web abut, so that the secondary web is clamped on one side in this embodiment is and can be compressed if necessary in the direction of all surfaces.

The applied pressure bands on the longitudinal sides are adjustable relative to each other arranged in the curing oven, so that they to different widths secondary nonwovens can be adapted or with appropriate setting a planned Transfer compression to the secondary web.

The pressure bands applied to the longitudinal sides of the secondary web are permeable to air formed and in particular have openings through the heated Gas, especially hot air, is conductive to additional heat energy to introduce the secondary web to cure the binder.

Finally, it is provided that the opening in the on the longitudinal sides of the secondary web adjacent Druckbändem on the upper area, in particular the upper half of the printing belts are limited so that flow shorts be avoided in the secondary web.

In the method according to the invention or with the device according to the invention Thus, the impregnated with a binder, in a collection chamber collected primary nonwoven depending on the width and the thickness in split two or more sublanes. The partial webs are subsequently superimposed and individually deflected by 90 ° about its longitudinal axis and thus standing on one side and led on a collecting conveyor belt. The one above the other arranged partial webs are then fed to a pendulum, the off two parallel conveyor belts exists, which is a common Vertical axis oscillate, so that the partial webs meandering together parked the collection conveyor belt.

By laterally arranged pressure belts, the partial webs of the primary web, which in aufgependelter form the secondary web, to a desired Width compressed. Instead of a continuous compaction by reduction the mutual distance of the laterally arranged pressure belts or pressure rollers The compression can also by stroke-like movement of these construction elements be executed. The direction of movement of the printing tapes or the Pressure rollers are preferably at right angles to the conveying direction of the secondary web. But there is also the possibility of compression under one to execute any angle in the direction of the conveying direction.

Alternatively, it can be provided that the withdrawn from the collection chamber Primary fleece is divided into several sub-webs, which then individual swinging conveyors, consisting of conveyor belts or roller sets be supplied. In this procedure, the partial webs are individually pendulated before being subsequently brought together and arranged laterally Printing tapes are supplied.

By a decreasing within the oscillating conveyor speed and by reducing the distance of the conveyor belts or Transport rollers, wherein the opposite conveyor belts or transport rollers be set relative to each other, is a compaction of the partial webs connected with an intensive Auf- or Verfaltung the fibers possible. The compression and configuration of the partial webs can be customized for the individual partial webs be made so that when merging the individual partial webs a sandwich element with sections of different characteristics can be produced. For example, it is in the production of wide fibrous insulation webs It makes sense to strengthen and condense the inner subpaths Fold as the outer, so as not to unwanted by excessive lateral forces different compression of the entire fiber mass or the Faserdämmstoffbahn across the width.

To the mutual adhesion of the surfaces of the above-described Execution of the method according to the invention produced partial webs to improve and increase the tensile strength of the fibrous insulation web in parallel To increase the large surfaces, the conveyor belts or transport rollers with trapezoidal shaped surfaces, for example in Schaffußform, be educated. In addition, the large surfaces of the partial webs can additionally impregnated with binders to the partial webs after merging better to adhere to each other, with the additional binder is finally cured in the subsequent hardening furnace and to a further improved adhesion of the partial webs contributes to each other.

In addition, reinforcing fabrics or nonwovens made of glass, carbon, Metal, temperature-resistant plastics or natural fibers on the side surfaces the partial webs or the primary web or secondary web but also between the partial webs are provided. The fleeces are here with opposite fed to the partial webs of smaller width, since the primary web in a further intermediate step before or after the hardening furnace on its long sides is cropped. Due to the intensive configuration of the partial webs or the secondary web form the inserted fabric or nonwovens over the entire surface the insulating panels formed from the fiber insulation sheet effective reinforcing elements. These reinforcing elements have an effect, in particular with regard to on the transverse tensile strength of the insulation boards and can do the inevitable time-dependent, by hygrothermal and / or hydromechanical Stress-related strength losses of such insulation not only too but also lead to more safety in the application of such Insulation materials.

In order to be able to optimally control the compaction and configuration, the collection conveyor belt can from several individual conveyor belts or roller sets or combinations of both construction elements exist with decreasing Speed are operated and thus a compression of the secondary web effect in the transport direction. Furthermore, in the transport direction, i.e. across the width of the production plant several narrow bands or Roller sets can be arranged distributed across the width of the production line be driven at different speeds. This will achieve that the compaction and the framing also in the central areas of the secondary web can be influenced. For example, a lower conveyor belt supplemented by a mirror-image arranged upper pressure band, which on the pulp mass to be folded or compressed acts. This print tape has first and foremost the task of favoring the composition, with a too large one Compression in the horizontal direction should be excluded as possible. For support the folding effect in the transport direction, the lower and upper subbands with projections protruding from their surface be formed, which engage in the pulp, in particular the secondary web and move the fibers relative to each other.

The secondary web can have a thickness between 200 and 2000 mm with a bulk density of about 40 to 300 kg / m ³ . In this state, the secondary non-woven fabric in the region below its large surfaces at certain depth fibers, which are not formed substantially perpendicular to the large surfaces. Since a Faserdämmstoffbahn is to be produced, which has almost exclusively aligned at right angles to the large surfaces mineral fibers, these areas are subsequently separated by horizontally guided cutting tools from the secondary web. The separated fibers can be fed to an internal recycling process in a known manner and remelted. However, there is also the possibility that the separated fiber layers are again fed to the primary web directly or the fiber mass flow in the collection chamber after appropriate loosening.

Since the secondary web held together mainly by the lateral pressure bands is the possible reorientation of the mineral fibers due to its own weight low in the contact area of the fibrous web. An upper pressure band is generated Here only so much pressure that a bulging of the secondary web through the Pressure of the side profile strips is prevented. At the same time, this air-permeable, on the surface of the secondary nonwoven tape lying on the controlled Carrying out the drying of the existing moisture and the Curing the binder required hot air. This drying takes place in one Curing oven.

Such a curing oven is usually made of two stable stacked Pressure belts through which hot air is sucked. At heights of secondary nonwovens of less than 200 mm is applied to the sealing of the side surfaces of the Secondary fleece no special value. The secondary web remains about 2 to 15 minutes, preferably less than 10 minutes in the curing oven, so that relatively hot air with temperatures of about 250 to 320 ° C are used must be in order to achieve sufficient curing of the binder. Here is take care that a destruction of the organic substance of the binder is avoided, as this discoloration occur, the for sale of the product produced. At such temperatures are In addition, the added to the hydrophobization of the fibers oils, oil emulsions or the like is not yet substantially voluminous.

The secondary webs presented by the method according to the invention have a width between 500 and 2400 mm width and material thicknesses up to 2000 mm. The leadership of the hot air through the secondary web naturally occurs the shortest path, i. in the indicated variations between thicknesses and Widths from top to bottom or vice versa and in sections Reversal. By the use of side pressure bands, which also Partially permeable to air, hot air can be added continuously from top to bottom sucked or pressed by the fiber mass and in addition can be entered or removed via the side print bands. By the existing openings can be transferred as much energy as they are to Drying and curing of organic binders such as phenol, Formaldehyde, urea-resin mixtures or the like together with the existing moisture in the order of 3 to 10% by mass within of about 2 to 8 minutes is needed, with the secondary web at a temperature from about 120 to 170 ° C is heated. When using binders, such as silicic acid dispersed as nanoparticles, which cure via sol-gel processes, appropriate changes of the heating and holding time are to be provided.

After curing of the binder in the curing oven is the structure of the secondary nonwoven fixed, so that the endless secondary web are transported freely can. The secondary web is now to avoid energy loss in one heated and sufficiently thermally insulated drying duct passed, in which the evaporate in inclusions or the enriched there resin existing water can. At a temperature of approx. 150 ° C, a drying time of approx. 40 to 80 minutes provided. By predrying the air in the drying channel at a relative humidity of less than 30%, the drying process is effectively supported or abbreviated as appropriate.

After leaving the drying channel, the pulp becomes air in the room cooled. The energy content of the exhaust air can be used to heat the dryer air be used. The endless secondary web is now cut horizontally or divided into individual sections, which then form insulating panels. To one more compact design, in particular a reduction in the length of the downstream Trockners can reach the secondary web after curing of the binder are divided into sections in the hardening furnace. This block-like Sections are stacked next to and / or above each other. The by this procedure incurred energy losses must be replaced by a corresponding Increase of the temperature, but especially by a longer residence time in be compensated for the dryer. In a further variant, the secondary nonwoven cooled down conventionally by room air after curing of the binder and horizontally in insulation boards of the desired dimensions and split vertically. These insulation boards are then individually or passed in stacks over an air-permeable belt and by means of hot air heated to about 120 to 170 ° C, preferably 150 to 160 ° C and then piled up to larger units to prevent energy losses and nachgetrocknet according to the described process technology.

Figur 1

eine erste Ausführung eines Abschnitts einer Vorrichtung zur Durchführung eines Verfahrens zur Herstellung einer Faserdämmstoffbahn in Draufsicht;

Figur 2

eine zweite Ausführungsform eines Abschnitts einer Vorrichtung zur Durchführung eines Verfahrens zur Herstellung einer Faserdämmstoffbahn und

Figur 3

ein weiterer Abschnitt der Vorrichtung gemäß den Figuren 1 oder 2 in Seitenansicht.

Further features and advantages of the invention will become apparent from the following description of the accompanying drawings. In the drawing show:

FIG. 1

a first embodiment of a portion of an apparatus for carrying out a method for producing a Faserdämmstoffbahn in plan view;

FIG. 2

a second embodiment of a portion of an apparatus for carrying out a method for producing a Faserdämmstoffbahn and

FIG. 3

a further section of the device according to the figures 1 or 2 in side view.

FIG. 1 shows a plan view of a section of a device for producing a device in individual insulation boards of mineral fibers splittable Faserdämmstoffbahn 1. For this purpose, a primary web 2 of a cutting device 3 is supplied, which Cutting device 3 has three bandsaws 4, which the primary web 2 in four side by side lying on a conveyor not shown Part webs 5 divides.

The partial webs 5 are then passed over each other and then in a region 6 each rotated by 90 ° about its longitudinal axis.

These individually rotated by 90 ° and continue stacked sub-webs 5 are then fed to a shuttle 7, which consists of two parallel to each other and spaced apart Druckbändem 8 is, which print bands 8 to a common vertical Axis oscillate and the partial webs 5 of the primary web 2 meandering on a Place conveyor 9.

The meandering deposited partial webs 5 of the primary web 2 are then laterally arranged pressure belts 10 supplied with their pendulum device 7 facing away from each other ends are aligned. Between the printing tapes 10, the partial webs 5 of the primary web 2 are compressed. The partial webs 5 of the primary web 2 form a secondary web at this time 11th

The secondary web 11 is essentially characterized in that its Einzelfasem predominantly perpendicular to the large surfaces of the secondary web 11 are aligned. For this purpose, it should additionally be stated that the mineral fibers in the primary web 2 an orientation substantially parallel to the large Surfaces of the primary nonwoven 2 have. Only in the immediate area of large surfaces are the individual mineral fibers of the secondary web 11 by the compression and the unfolding of the primary web 2 or secondary web 11 substantially parallel to the large surfaces of the secondary web 11 aligned.

The secondary web 11 is connected to the printing tapes 10 further pressure bands Supplied according to Figure 3, which on the large surfaces of the secondary web 11 act. Between the Druckbändem 12 and a curing oven 13 is another cutting device 14 is arranged, which consists of two saws 15, which saws 15 horizontally and parallel to the large surfaces of the secondary web 11 are aligned so that by means of these saws 15 cover layers 16th be separated in the region of both large surfaces of the secondary web 11 can.

The cover layers 16 comprise the region of the secondary nonwoven 11, which has a Fiber profile arranged parallel to the large surfaces of the secondary nonwoven 11 Mineral fibers. Thus, the curing oven 13 is a secondary web 11 with almost exclusively perpendicular to the large surfaces of the Sekundärvlieses 11 extending fiber assembly supplied.

The hardening furnace 13 in turn consists of two acting on the large surfaces Conveyor belts 17, which are permeable to air, so that hot air in Direction of the arrows 18 shown in Figure 3 by the secondary web 11 diffuse can.

The secondary web 11 is after leaving the curing oven 13 a not fed dryer shown to subsequently after drying to be cut into individual insulation boards.

An alternative embodiment of the section according to FIG. 1 is shown in FIG. In this embodiment, the partial webs individual pendulum devices 19 fed, each consisting of two roller conveyors 20, which a decreasing in the conveying direction according to arrow 21 distance from each other to have. The individually suspended partial webs 5 are then together two further roller conveyors 100 fed, between which the individually pendulum Part webs 5 are interconnected and compressed. The Roller conveyors 100 also have a decreasing direction in the direction of arrow 21 Distance from each other and perform the same task as the Printing tapes 10 of the embodiment according to FIG. 1.

Claims (32)

1. Process for manufacturing a fibrous insulation web (1), particularly one which can be divided in individual mineral fiber insulation boards having the mineral fibers substantially aligend at right angles to the large surfaces thereof, in which process said mineral fibers are drawn off from a collecting chamber and are deposited on a conveyor belt as a primary fibrous web (2) having the mineral fibers aligned substantially parallel to the large surfaces,
   characterized in that said primary fibrous web (2) is divided in at least two and preferably more partial webs (5) particularly having equal dimensions by cuts being made at right angles to the large surfaces,
   that said partial webs (5) are thereafter turned about their longitudinal axis by 90°, and
   that said partial webs (5) are treated in a pendulum fashion and combined into a secondary fibrous web (11).
2. Process according to claim 1,
   characterized in that prior to being turned about their longitudinal axis relative to their conveying plane said partial webs (5) of said primary fibrous web (2) are arranged one above the other.
3. Process according to claim 1,
   characterized in that said partial webs (5) and/or said secondary fibrous web (11) are or is compressed during and/or after said treatment in a pendulum fashion.
4. Process according to claim 3,
   characterized in that said compression is effected in two directions substantially aligned at right angles to each other.
5. Process according to claim 1,
   characterized in that said secondary fibrous web (11) is advanced to a hardening furnace (13).
6. Process according to claim 1,
   characterized in that each of the large surfaces of said secondary fibrous web (11) is having a thin cover layer (16) separated therefrom.
7. Process according to claim 6,
   characterized in that from said thin cover layer (16) which is separated from at least one of the large surfaces of said secondary fibrous web (11) a mineral fiber product with a laminar structure is formed for impact sound proofing particularly under a floating floor.
8. Process according to claim 6,
   characterized in that said cover layer (16) is separated prior to advancing said secondary fibrous web (11) to a hardening furnace (13).
9. Process according to claim 6,
   characterized in that said cover layer (16) is advanced to said hardening furnace (13) separately of said secondary fibrous web (11).
10. Process according to claim 6,
    characterized in that said cover layer (16) is compressed to a bulk density as required by its specific application before the hardening furnace (13).
11. Process according to claim 6,
    characterized in that said cover layer (16) is separated after advancing said secondary fibrous web (11) to a hardening furnace (13).
12. Process according to claim 1,
    characterized in that said primary fibrous web (2) is combined with one or more fibrous web layers which particularly have different properties.
13. Process according to claim 1,
    characterized in that said primary fibrous web (2) is upset prior to or during said treatment in a pendulum fashion.
14. Process according to claim 1,
    characterized in that the surfaces of said partial webs (5) or of said cover layer (16) are impregnated with binders.
15. Process according to claim 1,
    characterized in that between adjacent partial webs (5) reinforcing fabrics and/or webs for example of glass, carbon, metal, temperature-resistant synthetic and/or natural fibers are arranged.
16. Process according to claim 1,
    characterized in that said secondary fibrous web (11) and/or said cover layer (16) is compressed at right angles to its large surfaces before and/or in said hardening furnace (13).
17. Process according to claim 1,
    characterized in that a structure is impressed in the large surfaces of said secondary fibrous web (11).
18. Process according to claim 5,
    characterized in that within said hardening furnace (13) hot air is introduced both at right angles to the large surfaces and through the longitudinal sides of said secondary fibrous web (11) or said cover layer (16).
19. Process according to claim 1,
    characterized in that said secondary fibrous web (11) or said cover layer (16) is guided in a polydirectionally clamped state until after the curing of the binder.
20. Process according to claim 1,
    characterized in that said secondary fibrous web (11) or said cover layer (16) is cut to individual sections parallel to its large surfaces after the curing of the binder.
21. Process according to claim 1,
    characterized in that after curing of the binder said secondary fibrous web (11) or said cover layer (16) is divisioned in individual boards of a cuboid shape by cuts running at right angles to its large surfaces.
22. Process according to claim 1,
    characterized in that after the curing of the binder said secondary fibrous web (11) or said cover layer (16) is trimmed on the longitudinal sides thereof for forming plane surfaces.
23. Process according to claim 5,
    characterized in that said secondary fibrous web (11) or said cover layer (16) is advanced to a drying conduit after said hardening furnace (13).
24. Device for carrying out the method according to one of the claims 1 to 18, said device comprising a conveyor belt (9) for conveying a primary fibrous web (2) of mineral fibers from a collecting chamber to a pendulum device (7),
    characterized in that said conveyor belt includes a cutting device (3) by means of which said primary fibrous web (2) can be divided in partial webs (5) juxtaposed on said conveying belt, and that said cutting device (3) includes a downstream turning means by which said individual partial webs (5) can by turned by 90° with respect to their longitudinal axis before they enter said pendulum device (7) for forming a secondary fibrous web (11).
25. Device according to claim 19,
    characterized in that said cutting device includes saws in a number n-1 corresponding to the number of required partial webs (5), which saws are particularly in the form of belt saws (4) or circular saws.
26. Device according to claim 19,
    characterized in that said pendulum device (7) is in the form of pressure belts (10) or roller belts (100) arranged as a pair for all said partial webs (5).
27. Device according to claim 19,
    characterized in that said pendulum device (7) is in the form of pressure belts or roller belts (20) arranged as a pair for one partial web (5) respectively.
28. Device according to claim 19,
    characterized in that said pendulum device (7) includes a downstream hardening furnace (13) with at least two pressure belts (17) resting on the large surfaces of said secondary fibrous web (11) and having a heated gas, particularly hot air passed therethrough.
29. Device according to claim 23,
    characterized in that in said hardening furnace (13) two pressure belts are provided abutting the longitudinal sides of said secondary fibrous web (11).
30. Device according to claim 23 and/or claim 24,
    characterized in that said pressure belts are mutually adjustably arranged in said hardening furnace (13).
31. Device according to claim 24,
    characterized in that said pressure belts (17) are air-permeable, particularly having openings through which a heated gas, particularly air can be passed.
32. Device according to claim 26,
    characterized in that said openings are limited to the upper region, particularly the upper halves of said pressure belts.

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