Method and device for producing a mat of scattered material for pressing into a mineral panel, and mineral panel

Abstract

The invention relates to a method and a device for producing a mat of scattered material (1) using particles (2, 3, 4), in particular fibres, formed of mineral substances, for example rock wool or glass wool, on a running forming belt (23), comprising the following steps: a) providing a hopper (20) having mixed fine and coarse particles (2, 3) and grit (4), b) dividing the particles (2, 3) and grit (4) emerging from the hopper (5) via at least one first size-dividing device (8) into at least one first partial quantity (5) having fine and coarse particles and at least one second partial quantity (6) having predominantly grit (4), c) further forwarding the first partial quantity into a second size-dividing device (9) in a first feed region (14) and fractioning the first partial quantity (5) again according to particle size, and d) scattering the particles (2, 3) of the partial quantity (5) as a layer having an increasing or decreasing size onto the forming belt (23) in order to form the mat of scattered material (1) with a desired thickness. In order to obtain a particularly smooth surface, the second partial quantity (6), which contains the grit (4), is also fed to the second size-dividing device (9) in a second feed region (15), which is different from the first, but is scattered onto the running forming belt (23) in a time-staggered manner in relation to the first partial quantity, such that at least the grit (4) is arranged above a layer of fine particles (2) in the thickness of the mat of scattered material (1).

Description

[0001] andrejewski • honke

[0002] Patent and legal attorneys

[0003] Patent application August 28, 2025

[0004] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0005] Method and apparatus for the production of a spreading mat for pressing into a mineral slab, as well as mineral slab

[0006] Description:

[0007] The invention relates to a method for producing a spreading mat using particles, in particular fibers made of mineral materials, for example rock or glass wool, on a moving conveyor belt, comprising the following steps: a) providing a hopper with mixed fine and coarse particles and grit, b) dividing the particles exiting the hopper via at least a first size-separating device into at least a first subset with fine and coarse particles and at least a second subset with predominantly grit, c) further conveying the first subset into a second size-separating device in a first feed area and fractionating the first subset again according to particle size, and d) spreading the particles of the first subset as a layer of increasing or decreasing size onto the conveyor belt to form the spreading mat with a desired thickness.

[0008] The invention further relates to a device for producing a grit mat in the course of manufacturing mineral slabs according to one of the method claims with

[0009] • at least one bunker containing fine and coarse particles of mineral materials, for example rock or glass wool, and shot, andrejewski • honke

[0010] Patent and legal attorneys

[0011] Patent application August 28, 2025

[0012] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0013] 2

[0014] • at least one first size-separating device for dividing the spreading material exiting the bunker into at least a first subset with fine and coarse particles and a second subset with predominantly shot,

[0015] • at least a second size-dividing device for fractionating the first subset fed into a first feed area, and

[0016] • a form strip onto which the first subset can be scattered.

[0017] Finally, the invention comprises a mineral material plate which was produced, for example, using the method and / or the device.

[0018] Mineral fiber boards are typically manufactured, at least predominantly, from mineral materials of varying shapes and sizes. They serve as thermal insulation for energy conservation, and potentially also for fire protection and sound insulation. The invention described here defines a mineral fiber board as a board with a density of 15 to 1400 kg / m³. 3 Therefore, the following count

[0019] • Sound and heat insulation panels with a density of 15 to 160 kg / m³ 3 , as well as

[0020] • Facade panels or wall claddings with a density of 400 to 1400 kg / m³ 3 in addition.

[0021] According to the manufacturers' specifications for the most commonly used materials, a) rock wool is used. This is produced by fusing stone, limestone, and recycled molded bricks with other raw materials at 1,500 °C. The molten rock is then spun into fibers in a further step. Binders and impregnating oil are added to give the products stability and water-repellent properties. andrejewski • honke

[0022] Patent and legal attorneys

[0023] Patent application August 28, 2025

[0024] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo) The rock wool is then reheated to approximately 200 °C to harden the binders and stabilize the material for final processing. Environmentally friendly equipment – ​​filters, air preheaters, afterburners with heat recovery systems, and other cleaning and collection systems – ensures the most environmentally friendly process possible. b) Glass wool is used. This is manufactured in a very similar way. The required quantities of raw material are weighed, mixed, and fed into a melting furnace. The raw materials used include primarily recycled glass, sand, limestone, and soda ash, as well as production offcuts that are reintroduced into the manufacturing process. The starting material is melted in a furnace at very high temperatures of approximately 1400 °C.After passing through the melting furnace, the glassy molten material is fiberized by directing a thin jet of glass onto rapidly rotating discs, where it is flung through thousands of tiny holes in the disc's outer wall. The resulting fibers are then further processed into fine woolen threads using gas burners. These fibers are sprayed with small amounts of a water-soluble binder. The binder is then cured in a continuously running hardening oven at approximately 200°C. The product's structure and density can be precisely tailored to the specific application requirements.

[0025] These two materials have also been experimentally mixed with organic substances, such as wood chips or fibers, or with synthetic substances, such as plastics like EPS, XPS, PUR, and PIR. andrejewski • honke

[0026] Patent and legal attorneys

[0027] Patent application August 28, 2025

[0028] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0029] 4

[0030] The production of mineral composite panels ultimately takes place either in cycles or continuously. Since significant pressures are generally applied in the compaction units, or the combined joining and compaction units, during mineral composite panel production, these units are usually referred to by those skilled in the art as the press section when referring to the entire system. In the production of mineral composite panels as described in this document, the operating pressures here, depending on the material and size of the mineral composite panel to be produced, are usually in the range of approximately 50 N / cm². 2 and approximately 500 N / cm 2 and advantageously between 100 N / cm 2 and 400 N / cm 2The operating principle of the joining and / or compaction unit determines whether the overall process is described as a cycle-based or continuous process. In cycle-based production, the mineral material sheets are pressed as flat objects with finite dimensions in all three spatial directions, whereas mineral material sheets produced in a continuous process represent lengths of a continuously pressed web.

[0031] To produce all of these mineral slabs, aggregate must first be spread onto a forming belt. This aggregate, continuously spread to the desired thickness, forms the basis for the production of the mineral slab.

[0032] Fibers of mineral materials, typically between 1.5 and 10 mm long, are used as spreading material. Bunkers often contain not only fibers but also shot, which can consist of very small, unmelted lumps or particles of stone, glass, or glue. Colloquially, these particles are also called "shots." The majority of shot is approximately [andrejewski • honke]

[0033] Patent and legal attorneys

[0034] Patent application August 28, 2025

[0035] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0036] 5

[0037] The grain size ranges from 50 µm to 250 µm in diameter, but can sometimes reach up to one millimeter. Nowadays, the shot is stochastically mixed into mineral materials, which has negative consequences. Because the shot is also distributed across the cross-section of the resulting mineral slab, the surfaces are too rough to be properly finished. If the small clumps are sorted out beforehand by separation, as is done, for example, with...

[0038] Anyone familiar with wood-based panel production knows that a great deal of additional design effort is required.

[0039] In the wood-based materials industry, for example, it is often desirable for spreading machines to separate particles according to size or shape in order to positively influence the product properties of the subsequently manufactured panels. For instance, with particleboard, the smallest geometrically defined particles are scattered towards the surface of the spreading mat, while with OSB, the largest particles are scattered towards the respective surface.

[0040] For fractionation and the size separation device mentioned here, sieves, so-called roller spreaders, or sometimes air classifiers are frequently used. Both methods can be seen in DE 10 2016 113 014 B4. After air classification of the spreading material, roller spreaders are used to distribute the spreading material – possibly classified by size – by, for example, transferring the spreading material from roller to roller, allowing increasingly larger particles to fall through the gaps between the spreading rollers, and finally, large clumps are sorted out and removed via a screw conveyor.

[0041] It should also be noted that the rollers of the roller spreading heads can have different designs, which allow, for example, andrejewski • honke

[0042] Patent and legal attorneys

[0043] Patent application August 28, 2025

[0044] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0045] Six longer chips or fibers are oriented during spreading onto the forming belt, for example, perpendicular or longitudinal to the belt's direction of travel. This allows for layers with different fiber orientations within the spreading material mat. A prior art patent, DE 10 2007 049 947 A1, should also be mentioned here. The rollers can also consist of discs spaced at defined intervals to allow the passage of spreading material of specific sizes, and may optionally be star-shaped to improve material transport with their teeth.

[0046] In this invention, a roller spreading head as a possible size division device is understood to mean all roller spreading heads consisting of at least three adjacent rotatable rollers which are capable of allowing particles of a defined size or weight to fall between the rollers, transporting particles resting on them in one direction or distributing particles evenly.

[0047] Furthermore, DE 10 2016 109 987 A1 describes a spreading system with a spreading head and at least one metering hopper, wherein the spreading head has at least one feed opening for receiving the spreading material and at least one roller arrangement with rollers for manipulating and / or spreading the spreading material. The spreading head has at least one first feed area and at least one second feed area spaced apart from it in or against the direction of production. At least one, preferably all, rollers of a roller arrangement can have their direction of rotation changeable. By using the described components alternatively or cumulatively, a spreading mat with a modified layer sequence should be obtainable without requiring any changeover or downtime in the spreading system. andrejewski • honke

[0048] Patent and legal attorneys

[0049] Patent application August 28, 2025

[0050] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0051] 7

[0052] Furthermore, DE 28 53 284 A1 discloses a method for producing a fiber mat provided with a reinforcing layer, wherein at least one underlayer of the fiber mat is formed, the reinforcing layer is applied, and then at least one toplayer of the fiber mat is applied to the reinforcing layer. This is implemented with a device having at least one forming head for forming a fiber mat on a moving carrier, wherein the forming head has at least two spreading points offset from each other in the direction of travel of the carrier, and wherein at least one thread feeder is arranged between the spreading points.

[0053] Furthermore, DE 10 2017 007 067 A1 discloses a device or method for producing mineral-bonded boards, in which a raw material mat is formed, moistened, and pressed. To achieve more homogeneous moistening of even thicker raw material mats throughout their entire volume and to reduce the amount of liquid used compared to the prior art, it is provided that the moistening of the raw material mat is carried out via nozzles in a nozzle arrangement, the pressure of which causes a jet of liquid to penetrate the raw material mat.

[0054] Finally, CN 1051829 C also deals with the production of mineral fiber boards.

[0055] The object of the invention is to ensure that the grit is present only to a small extent or not at all on at least one surface of the mineral board, so that the overall tactile impression of the board is smoother than that of conventional mineral boards. This also results in, for example, a smoother finish for paint or coating. andrejewski • honke

[0056] Patent and legal attorneys

[0057] Patent application August 28, 2025

[0058] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0059] 8

[0060] The problem is solved with regard to the method by the features of claim 1 and in particular by the fact that the second subset, containing the shot, is also fed to the second size-dividing device in a second feed area different from the first, but is spread onto the moving forming belt in such a time offset to the first subset that at least the shot is arranged above a layer of fine particles in the thickness of the spreading mat.

[0061] The problem is solved with regard to the device by the features of claim 13 and in particular by the fact that the second size division device has at least a second feed area for the second subset, away from the first feed area and in the direction of travel of the forming belt behind the first feed area, and that the second subset can also be scattered onto the forming belt.

[0062] The inventors recognized that it is best to separate the shot from the fine and coarse spreading material beforehand. The fine and coarse spreading material, i.e., the fine and coarse particles, can then be separated and spread in such a way that the fine particles are near the surface and the coarser particles, or increasingly coarser particles, are spread further down the grain. Only then, according to the invention, is the shot, which is also fed into the second size-separation device, spread after the fine and coarse spreading material. This ensures that the surface of the mat and the subsequently pressed plate, which rests on the forming belt during the process, remains shot-free and particularly smooth. With the preferred third spreading layer, consisting, for example, of fine particles, the upper surface can then also be finished so that it remains smooth and free of shot particles on the outer surface. andrejewski • honke

[0063] Patent and legal attorneys

[0064] Patent application August 28, 2025

[0065] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0066] The rationale is to continue using the shot without scattering it in near-surface areas, as it remains beneficial for certain plate properties, such as increased strength. Furthermore, this eliminates the need for an alternative, more complex method of shot removal to achieve smooth surfaces.

[0067] To distribute the necessary third fraction, which is essential for achieving a smooth, even surface on both sides of the finished mat or sheet and ensures that the second fraction of the shot is evenly distributed across the thickness of the mat or sheet, the spreading head can be designed so that this third fraction also originates from the same hopper from which the first and second fractions were generated. However, it is also advantageous to install the existing spreading head, along with a possible second hopper, in a mirror image configuration behind the first spreading head, in the direction of travel of the forming belt. In this case, the shot last distributed by the first spreading head is first applied to the already partially formed mat, followed by the coarse and fine particles, which then create a smooth surface after the entire mat has been compressed, for example, in a continuous double-belt press.

[0068] To avoid confusion in terminology, it should be noted that a spreading head refers to an entire spreading device, including a hopper. A spreading head can contain several size-division devices, such as roller spreading heads, preferably arranged one above the other.

[0069] It is advantageous if at least a subset is fed to the second size-dividing device with the assistance of gravity. andrejewski • honke

[0070] Patent and legal attorneys

[0071] Patent application August 28, 2025

[0072] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0073] 10

[0074] This eliminates the need for guiding devices for the fine and coarse particles or the shot, which significantly simplifies the process.

[0075] It is also preferred that, during fractionation of the first subset in the second size-dividing device, the coarse particles of the first subset are fed to the second subset.

[0076] This supports the desired internal structure of the mineral board, in which the fine particles are arranged on the outermost surface and then increasingly larger particles and fibers are scattered until finally the shot is embedded.

[0077] This also has the advantage that both the first sub-quantity and the second sub-quantity from the second size-dividing device are spread onto the forming belt.

[0078] It is particularly advantageous to use roller spreading heads with at least three adjacent rollers as size division devices.

[0079] These rollers form at least two, preferably stacked, roller beds, which are generally arranged horizontally, but can also be found in inclined arrangements in the prior art. The rollers are so close together that gaps between them only allow particles of a certain maximum size to pass through. Otherwise, the spreading material is transported further on the rotating rollers. The distance between the rollers can increase from roller to roller, so that progressively larger particles are then ejected. Depending on the design of the rollers, however, the spreading material behaves differently. In one example, the adjacent rollers have interlocking teeth. In a second example, the rollers consist of spaced-apart discs, where the discs are [andrejewski • honke]

[0080] Patent and legal attorneys

[0081] Patent application August 28, 2025

[0082] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0083] The following rollers engage precisely into the gaps. These discs can also have a toothed surface on their circumference with a geometry adapted to the spreading material.

[0084] The two size-division devices can thus be formed by just a first and a second roller spreading head, which does not preclude the possibility of further roller spreading heads being arranged above or below. In a simple manner, the spreading material can fall onto the second spreading head below after being divided on a first roller spreading head. For example, the lowest roller spreading head, which has two feed areas for the first and second portions, can be the second spreading head from which both portions are spread onto the forming belt.

[0085] This allows the first size-division device, for example, a first roller spreader, to feed the fine and coarse spreading material, which is often interwoven as fibers of mineral insulation material, along the roller bed towards the first spreading area of ​​the second size-division device. Meanwhile, the roller bed of the first spreader directly discharges the small shot pellets and carries them to the second feed area of ​​the second roller spreader. This departs from the conventional principle of spreading even the smallest particles, in this case the shot, immediately with a roller spreader. Instead, the shot is spread by being transferred or added to the second feed area of ​​the second roller spreader, after the fine and coarse particles have been spread.

[0086] This advantageously ensures that the first subset (fine and coarse spreading material) is transferred from the first roller spreading head to the first feed area of ​​a second roller spreading head, and the second subset (shot) is transferred from an andrejewski • honke

[0087] Patent and legal attorneys

[0088] Patent application August 28, 2025

[0089] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0090] 12 the roller spreading head is dropped onto the second feed area of ​​the second roller spreading head.

[0091] By using a suitable roller geometry and a tested roller spacing, it is preferred that fine particles are scattered onto the forming belt at one end of a roller spreading head, while coarser particles are transported via the roller spreading head in the direction of the supplied second subset in the second feed area.

[0092] This ensures that the fine particles are the first material to be spread onto the forming belt. Increasingly larger particles follow, until finally the shot is also spread onto a specific area of ​​the forming belt.

[0093] To better adapt to potentially varying spreading materials or to counteract possible clumping, it is advantageous if the rollers of a roller spreader head are driven at alternating speeds and / or directions of rotation within a row of rollers. This allows the spreading material to be distributed more effectively, and particles above a certain size are guided more efficiently over the roller spreader head.

[0094] To improve the quality of the mineral slab to be produced, it is possible to add additives to the spreading material, for example onto a roller spreading head or deeper in the direction of fall of the spreading material.

[0095] This creates a mineral-based panel with additional positive properties. andrejewski • honke

[0096] Patent and legal attorneys

[0097] Patent application August 28, 2025

[0098] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0099] 13

[0100] A roller spreading head arranged above, in accordance with the invention, for shot, but also for other solid or powdered additives, such as binders, fire retardants or insecticides, can be designed in such a way that it doses these in a targeted manner in different proportions as a gradient to the building layer of spreading material.

[0101] Furthermore, it is useful if the dispersion of the first subset is supported by a suction device for fine particles.

[0102] A suction device prevents the release of fine particles into the ambient air. Furthermore, these particles, which can significantly affect the surface quality and smoothness, are precisely directed to form the surface on the forming belt.

[0103] With regard to the device for producing a grit mat during the production of mineral slabs according to any one of claims 1 to 12, the claims are adapted accordingly to the process description. The advantages of the device are also analogous to those in the process description.

[0104] Only the different geometry of the rollers of the second roller spreader in the at least two feed areas requires further explanation. The advantage here is that the rollers below the first feed area are suitable for transporting coarser material, while the rollers in the second feed area deposit the shot precisely onto the lower top layer already on the forming belt, i.e., onto fine and coarse particles. andrejewski • honke

[0105] Patent and legal attorneys

[0106] Patent application August 28, 2025

[0107] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0108] 14

[0109] The inventors have also recognized that the workability of a mineral mat, particularly with regard to surface treatment, depends to a very high degree on the design of the outermost layers of the grit mat. Producing the surfaces from the finest fibers enables good post-processing. For this reason, it is particularly preferred to spread the top layers of the grit mat from the first batch after the size-division device and to shape the mineral mat, containing fine and coarse fibers of mineral materials and grit, optionally using the described device or method, such that the grit is located only in the interior of the mineral mat and not in its surface area.

[0110] Furthermore, it is also preferably provided that the mineral board also contains organic particles.

[0111] Understandably, if desired, mats with coarse particles near the surface and core layers with fine particles could also be produced using the device and method according to the invention.

[0112] The invention is explained in more detail below with reference to exemplary embodiments illustrated in the drawings. These show:

[0113] Figure 1: a schematic representation of a first apparatus according to the invention

[0114] Spreading device

[0115] Figure 2: a schematically represented second invention

[0116] A spreading device that essentially duplicates and mirrors Fig. 1. andrejewski • honke

[0117] Patent and legal attorneys

[0118] Patent application August 28, 2025

[0119] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0120] 15

[0121] Figure 3: schematic section through a grit mat or a finished mineral slab

[0122] The figures are used to illustrate, by way of example, the inventive method for producing a grit mat and a suitable system for its production. Furthermore, Fig. 3 shows a grit mat and the structure of the resulting mineral slab.

[0123] Figure 1 shows a spreading device 10 according to the invention, which is mounted in a stand. A hopper 20 is located at the top, containing both coarse particles 3 and fine particles 2 to be spread, as well as the shot 4. In this embodiment, the particles are primarily fibers made of mineral materials. Ultimately, a spreading mat 1 is to be formed on a forming belt 23 circulating around deflection rollers 24, which, after subsequent compaction, has a particularly smooth surface. For this purpose, a method and a device are provided that keep the rough shot particles away from the surface. The fiber material to be spread, with its fine and coarse particles 2, 3, can be further separated so that particularly fine particles 2 form at least one surface of the mat.

[0124] This is achieved by feeding the spreading material 2, 3, 4, which is at least partially coated with a binding agent, in bunker 20 via a circulating bunker conveyor belt 22 towards R1 to a bunker discharge metering unit 21. The bunker discharge metering unit 21 continuously delivers approximately the same quantity of spreading material per unit of time from bunker 20, consisting of fine particles 2, coarse particles 3, and shot 4. The terms "coarse" and "fine" are understandably relative, but the mineral fibers, which are primarily considered here, andrejewski • honke

[0125] Patent and legal attorneys

[0126] Patent application August 28, 2025

[0127] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0128] The particles 16 are typically 1.5 to 10 mm long, longer than the shot, which measures 50 to 250 pm. From the hopper, the material falls towards R2 to a first size-separating device, which in this embodiment is formed by a preferred first roller spreading head 12. This conveys a first subset 5, consisting of fine and coarse particles 2, 3, via its rollers onto a conveyor belt 11 running towards R4. The granular shot particles, on the other hand, fall as a second subset 6, sorted through the adjustable gaps between the rollers of the first roller spreading head 12, and land in the second feed area 15 on a second size-separating device 9, again in this embodiment a second roller spreading head 13. From this roller spreading head 13, all particles 2, 3 and shot 4 are fed onto the moving forming belt 23.Thus, the spreading material 2, 3, 4 from the bunker is separated into two subsets 5, 6 and subsequently recombined heterogeneously.

[0129] Therefore, the fine particles 2 and coarse particles 3 in the feed area 14 also fall onto the second roller spreading head 13, but in the direction of travel R3 of the forming belt 23, significantly ahead of the shot in the feed area 15. The roller spreading head is thus relatively long and covers at least partial areas of all spreading areas 25, 26, 27 for fine and coarse spreading material as well as shot.

[0130] In Fig. 1, the shot particles 4 are shown as small, but nevertheless oversized, black dots. The fine particles 2, on the other hand, are shown as light dots. For the sake of clarity, the additional coarse particles 3 are not shown. In this embodiment, the coarse particles 3 migrate from the first feed area 14 via the roller spreading head 13 towards the second feed area 15 and are gradually pushed through the gaps between the rollers, i.e., onto the andrejewski • honke

[0131] Patent and legal attorneys

[0132] Patent application August 28, 2025

[0133] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0134] 17

[0135] The drawing, from left to right, is shown in increasing size and is placed on the form strip 23.

[0136] The fine particles 2 fall directly from the first feed area 14 onto the forming belt. To ensure that particularly fine particles, which later provide the smooth surface of the mineral sheet, are the very first to land on the forming belt 23, these are drawn into the foremost area of ​​the spreading area 25 by a suction device 17 using air drawn in towards R5. The suction device is dimensioned so that hardly any particles are extracted, but rather they are only drawn in, so that they ultimately fall onto the forming belt 23 by the force of gravity.

[0137] It should also be noted that the rollers of the roller spreading head 13, in which the material placed on the rollers is transported via the rotation D of the rollers and separated or fractionated by certain distances, have a different geometry, here for example roller type 1 with the designation 18, in contrast to rollers that meter the material placed on the rollers directly, here for example roller type 19.

[0138] At various points throughout the entire spreading device 10, solid or powdered additives, such as binders, fire retardants, or insecticides, or even organic fibers, for example from wood, can be added to the spreading material 2, 3, 4. An optional particle feed 28 is shown with a dashed line to indicate an example location.

[0139] Profile errors can be automatically corrected using a measuring head 31 extending across the width of the spreading mat 1, which can measure the thickness or density of the spreading mat 1. Sectionally deployed andrejewski • honke

[0140] Patent and legal attorneys

[0141] Patent application August 28, 2025

[0142] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo)

[0143] 18 adjustable guide plates, roller spacing, addition positions and many other actuators are used and adjusted by motor.

[0144] If the spreading device 10 described in Fig. 1 were used, only one surface of the subsequent mineral slab would be particularly smooth, namely the one lying at the bottom on the forming belt 23. The rough shot 4 would even collect on the other surface. This may suffice for many purposes, but if both mineral slab surfaces are to be as smooth as possible, it is particularly easy to place the "same" spreading device 10' again, mirrored, behind the first spreading device 10. This is shown schematically in Fig. 2. This results in the shot 4' being first dropped onto the forming belt 23, i.e., into the future center height of the spreading mat 1 or the subsequently pressed dam slab. Predominantly coarse particles 3' then follow on top, and finally the fine particles 2'. Thus, at least a new third subset 7 is obtained, which covers the central area of ​​the spreading mat 1 with shot 4'.

[0145] The bunker 20, which is shown here for both spreading devices 10, 10', can of course also be divided.

[0146] Fig. 2 also indicates a press roller 29 to pre-compact the spreading mat 1, which may consist of bulk-forming rock or glass wool, before a final, preferably continuous press (not shown).

[0147] With the combined spreading device 10, 10' from Fig. 2, the spreading mat 1, only very schematically indicated in Fig. 3, as well as the finished mineral slab with a similar structure, only compacted, can be produced. Fine particles 2, 2' are located in the layers closest to the surface 30. Further inwards are the coarser particles 3, 3' and embedded within them is the grit 4, 4'. (Andre Jewski • Honke)

[0148] Patent and lawyers

[0149] Patent application August 28, 2025

[0150] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27817 / Lu / Bo)

[0151] 19

[0152] Surface 30 is characterized by its exceptional smoothness, which is easy to coat. The previously removed grit also has a strength-enhancing effect.

[0153] Andre Jewski • Honke

[0154] Patent and lawyers

[0155] Patent application August 28, 2025

[0156] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27817 / Lu / Bo)

[0157] 20

[0158] Reference symbol list

[0159] 1 grit mat

[0160] 2.2' Fine particles

[0161] 3.3' Coarse particles

[0162] 4, 4' Shot 5 First subset

[0163] 6 Second subset 7 Third subset 8 First size division device 9 Second size division device 10, 10' Spreading device 11 Conveyor belt

[0164] 12, 12' First roller spreader head

[0165] 13, 13' Second roller spreading head 14 First feed area 15 Second feed area 16 Stand construction 17 Suction device for fine spreading material 18 Roller type 1 19 Roller type 2 20 Bunker 21 Bunker discharge metering 22 Bunker belt 23 Forming belt 24 Deflection roller 25 Spreading area for fine spreading material 26 Spreading area for coarse spreading material 27 Spreading area for grit andre jewski • honke

[0166] Patent and lawyers

[0167] Patent application August 28, 2025

[0168] Siempelkamp Maschinen- und Anlagenbau GmbH (X 27817 / Lu / Bo)

[0169] 21

[0170] 28 Optional particle input (additives, organic substances)

[0171] 29 Press roller

[0172] 30 surface

[0173] 31 Measuring head

[0174] R1 Flow direction of grit in the bunker

[0175] R2 outflow from bunker

[0176] R3 Direction of travel of the forming belt

[0177] R4 Transport direction first subset

[0178] R4 air intake direction

[0179] Direction of rotation

Claims

1. andrejewski • honey Patent- and Rec. Patentmeldung 28. August 2025 Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo) Patentspruche:

1. Method for producing a spreading mat (1) using particles (2, 3, 4), in particular fibers, made of mineral materials, for example rock wool or glass wool, on a moving forming belt (23), comprising the following steps: a) providing a hopper (20) with mixed fine and coarse particles (2, 3) and shot (4), b) dividing the particles (2, 3) and shot (4) exiting the hopper (5) via at least a first size-separating device (8) into at least a first subset (5) with fine and coarse particles and at least a second subset (6) with predominantly shot (4), c) further conveying the first subset into a second size-separating device (9) in a first feed area (14) and fractionating the first subset (5) again according to particle size, and d) scattering the particles (2,3) of the first subset (5) as a layer of increasing or decreasing size onto the forming belt (23) to form the spreading mat (1) with a desired thickness, characterized in that the second subset (6), containing the grit (4), is also fed to the second size-dividing device (9) in a second feed area (15) different from the first, but is spread onto the moving forming belt (23) at a time offset from the first subset such that at least the grit (4) is arranged above a layer of fine particles (2) in the thickness of the spreading mat (1).

2. Method according to claim 1, characterized in that a further layer with fine particles (2') of a third subset (7) is sprinkled, such that the second subset (6) is arranged in the middle of the thickness of the spreading mat (1). andrejewski • honke Patent and legal attorneys Patent application August 28, 2025 Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo) 2 3. Method according to one of claims 1 or 2, characterized in that at least a subset (5, 6, 7) is supplied to the second size division device (9) with the assistance of gravity.

4. Method according to one of claims 1 to 3, characterized in that, during fractionation of the first subset (5) in the second size division device, the coarse particles (3) of the first subset (5) are fed to the second subset (6).

5. Method according to one of claims 1 to 4, characterized in that both the first subset (5) and the second subset (6) are scattered from the second size division device (9) onto the forming belt (23).

6. Method according to one of claims 1 to 5, characterized in that roller spreading heads (12, 13) with at least three adjacent rollers (18, 19) are used as size dividing devices (8, 9).

7. Method according to claim 6, characterized in that the first subset (5) is dropped from a first roller spreading head (12) into the first feed area (14) of a second roller spreading head (13) and the second subset (6) is dropped from a first roller spreading head (12) into the second feed area (15) of the second roller spreading head (13).

8. Method according to one of claims 6 to 7, characterized in that fine particles (2) are scattered at one end of a roller spreading head (12, 13) onto the forming belt (23), while coarser particles (3) are transported in the direction of the supplied second partial quantity (6) in the second feed area (15) via the second roller spreading head (13). andrejewski • honke Patent and legal attorneys Patent application August 28, 2025 Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo) 9. Method according to one of claims 6 to 8, characterized in that the rollers (18, 19) of a roller spreading head (12, 13) are driven alternately in a row of rollers at different speeds and / or directions of rotation (D).

10. Method according to one of claims 6 to 9, characterized in that additives, for example fire retardants, are added to the spreading material (2, 3, 4).

11. Method according to one of claims 1 to 10, characterized in that the scattering of the first subset (5) is supported by a suction device (17) for fine particles (2).

12. Method according to one of claims 1 to 11, characterized in that particles of fibers (2, 3) and / or shot (4) of mineral materials are mixed with further particles, e.g. chips or fibers, and / or shot of organic materials.

13. Device for producing a grit mat in the course of manufacturing mineral slabs according to one of claims 1 to 12, comprising at least one hopper (20) containing fine and coarse particles (2, 3) of mineral materials, for example rock or glass wool, and shot (4), and at least one first size-separating device (8, 12) for dividing the grit (2, 3, 4) emerging from the hopper (20) into at least a first subset (5) containing fine and coarse particles (2, 3) and a second subset (6) containing predominantly shot (4). andrejewski • honke Patent and legal attorneys Patent application August 28, 2025 Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo) 4 at least one second size-dividing device (9, 13) for fractionating the first subset (5) fed into a first feed area (14), and a forming belt (23) onto which the first subset (5) can be scattered, characterized in that the second size-dividing device (9, 13) has at least one second feed area (15) for the second subset (6), away from the first feed area (14) and in the direction of travel of the forming belt (R3) behind the first feed area (14), and that the second subset (6) can also be scattered onto the forming belt (6).

14. Device according to claim 13, characterized in that a third subset (7) optionally from a second bunker, containing fine particles (2') can be scattered onto the first and second subsets (5, 6) as a covering layer.

15. Device according to claim 13 or 14, characterized in that the second feed area (15) to the second size division device (9, 13) is located below the first size division device (8, 12).

16. Device according to one of claims 13 to 15, characterized in that the first size division device (8, 12) and second size division device (9, 13) are designed as roller spreading heads (12, 13).

17. Device according to claim 16, characterized in that at least the rollers (18, 19) of the second roller spreading head (13) have independent individual drives in their plurality. andrejewski • honke Patent and legal attorneys Patent application August 28, 2025 Siempelkamp Maschinen- und Anlagenbau GmbH (X 27 817 / Lu / Bo) 5 18. Device according to claim 16, characterized in that the rollers (18, 19) of the second roller spreading head (13) are adjustable in their distances from one another.

19. Device according to claim 16, characterized in that the rollers (18, 19) of the second roller spreading head (13) are formed from parallel disks on an axis, wherein the disks of one roller (18) in the first feed area (14) have a different shape than another roller (19) in the second feed area (15).

20. Mineral board comprising fine and coarse fibers (2, 2', 3, 3') of mineral substances and grit (4, 4') pressed into a mineral board, characterized in that the grit (4, 4') is located only in the interior of the mineral board and not in its surface area (30).

21. Mineral board according to claim 20, characterized in that the mineral board also contains organic particles

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