EP1708876B1 - Method for the production of a web of insulating material and web of insulating material - Google Patents

Abstract

The invention relates to a method for the production of a web of insulating material made of mineral fibres, wherein the mineral fibres are made from a melt and are deposited onto a conveyor as a primary non-woven material; the primary non-woven material is dangled at right angles in relation to the longitudinal extension thereof and is deposited as a secondary non-woven material onto a second conveyor; the secondary non-woven material is then displaced in such a way that the mineral fibres extend at right angles in relation to the large surfaces of the secondary non-woven material and the secondary non-woven material is divided into at least two webs of insulating material by means of a separating cut parallel to the large surfaces of the secondary non-woven material, said webs of material respectively comprising a large surface and a separating surface which has substantially the same area as the large surface and which is arranged opposite said large surface. In order to improve a generic method for the production of a web of insulating material made from mineral fibres such that the web of insulating material can better exhibit or more easily exhibit characteristics such as resistance and processability, particularly in the field of external building surfaces and covering surfaces of pipelines, a coating (39) is applied to at least one of the separating surfaces (36) of the two webs of insulating material (2).

Description

The invention relates to a method for producing an insulation web of mineral fibers, in particular of rock wool and / or glass wool, in which the mineral fibers are produced from a melt and deposited on a conveyor as a primary web, the primary web stabilized at right angles to its longitudinal extent and as a secondary web on a second Conveyor is stored, the secondary web is then moved so that the mineral fibers occupy a course perpendicular to the large surfaces of the secondary web and the secondary web is then divided by a separating cut parallel to the large surfaces of the secondary web in at least two insulating material webs, each one have large surface and a substantially coextensive, the large surface opposite arranged separation surface. The invention further relates to an insulation web of bonded with a binder mineral fibers, in particular of mineral wool and / or glass wool, having a large surface area and a resulting in dividing a secondary nonwoven web in two insulating material separating surface, wherein the mineral fibers in the region of the separation surface perpendicular to the parting surface and in the field the surface and an angle deviating from 90 ° to the large surface, in particular are arranged to extend parallel to the large surface, and with a lamination.

Insulating materials made of vitreous solidified mineral fibers are classified according to the chemical composition commercially available in glass wool and rock wool insulation materials. Both varieties differ in the chemical composition of the mineral fibers. The glass wool fibers are made from silicate melts that contain high levels of alkalis and boron oxides that act as fluxes. These melts have a wide processing range and can be removed by means of rotating bowls whose walls have holes, to relatively smooth and long mineral fibers, which are usually at least partially bonded with mixtures of thermosetting phenol-formaldehyde and urea resins. The proportion of these binders in the glass wool insulating materials, for example, about 5 to about 10 mass% and is also limited by the fact that the character of a non-combustible insulation material should be preserved. The bond can also be made with thermoplastic binders such as polyacrylates. The pulp is added to other substances such as oils in amounts below about 0.4% by mass for hydrophobing and dust binding. The impregnated with binders and other additives mineral fibers are collected as a fiber web on a slow-speed conveyor. In most cases, the mineral fibers of several shredding devices are deposited successively on this conveyor. The mineral fibers are oriented largely directionless in one plane. But they store very flat on top of each other. By slight vertical pressure, the fiber web is compressed to the desired thickness and the conveying speed of the conveyor simultaneously to the required density and the binder cured in a curing oven by means of hot air, so that the structure of the fiber web is fixed.

In the production of rock wool insulation impregnated mineral fibers are collected as thin as possible and lightweight mineral fiber fleece, a so-called primary fleece and carried away at high speed from the area of the fiberizing device to keep required coolant low, which otherwise in the course of further manufacturing process with additional energy would be removed from the fiber web. From the primary nonwoven an endless fiber web is built, which has a uniform distribution of mineral fibers.

The primary nonwoven consists of relatively coarse fiber flakes, in the core areas of which higher binder concentrations are present, while in the peripheral areas weaker or non-bonded mineral fibers predominate. The mineral fibers are aligned in the fiber flakes approximately in the transport direction. Rock wool insulation materials have contents of binders of about 2 to about 4.5% by mass. With this small amount of binders, only part of the mineral fibers are in contact with the binders. The binders used are predominantly mixtures of phenol, formaldehyde and urea resins. A part of Resins are already substituted by polysaccharides. Inorganic binders are used as for the glass wool insulating materials only for special applications of insulating materials, as these are much more brittle than the largely elastic to plastic plastic reacting organic binder, which accommodates the desired character of insulating materials made of mineral fibers as elastic-springy building materials. The additives used are mostly high-boiling mineral oils in proportions of 0.2% by mass, in exceptional cases also about 0.4% by mass.

Usually, the primary nonwovens are deposited by means of a pendulum-suspended conveyor transversely across another conveyor, which allows the production of an endless fibrous web consisting of a plurality of obliquely superimposed individual layers. By a horizontally directed in the conveying direction and a simultaneous vertical compression, the fiber web can be unfolded more or less intense. The axes of the main folds are aligned horizontally and thus run transversely to the conveying direction.

The forces acting on the fiber web cause binder-rich core zones are compacted and unfolded into narrow lamellae, resulting in main folds with folds in flanks. At the same time, the less bound or binder-free mineral fibers are slightly rolled in the interstices of the folds and between the lamellae and thereby slightly compressed. The fine structure thus consists of relatively stiff slats, which have a certain flexibility due to their numerous folds, but are relatively stiff parallel to the folding axes and form spaces which are easily compressible. As a result of the build-ups and dislocations, the compressive strength and the transverse tensile strength of the fibrous web clearly increase in comparison with a normal, in particular extremely flat, arrangement of the mineral fibers. The flexural strength of the fibrous web or of the sections separated from it in the form of plates or Dämmfilzen is therefore significantly higher in the transverse direction than in the production direction. In roof insulation panels with gross densities of about 130 to 150 kg / m ³ , the bending strength in the transverse direction is on the order of three to four times as high as the bending strength in the direction of production.

This dependence of the mechanical properties of the orientation of the mineral fibers in the insulating material is used for the production of lamellae for lamellar plates and commercially available lamellar sheets called products.

Slats are mostly 200 mm wide Danish fabric elements, which are cut off in the direction of production by an at least correspondingly thick fiber web. The mineral fibers in the fiber web or in the particularly solid lamellae are oriented at right angles to the cut surfaces, which are now the large surfaces of the lamellae. Slats with densities of more than about 75 kg / m ³ are therefore suitable as tensile and pressure resistant insulating layer on the outer walls of buildings and can be glued on the outer wall and then plastered with a reinforced plaster layer. Such insulation is referred to as a thermal insulation composite system. The pressure-resistant lamella is sufficiently flexible in the longitudinal direction so that it can also be glued onto curved components. At the same time, it is still so compressible at right angles to the side surfaces that deviations from the respective length and width (dimensional tolerances) between the individual lamellas can be compensated with a small contact pressure. This can be used to produce joint-tight insulation layers. Several fins are also assembled to lamella plates.

Slat plates in the bulk density range of about 30 to about 100 kg / m ³ , preferably <60 kg / m ³ are separated in the desired thickness in the production direction as lamellae of between about 75 to 250 mm thick fiber web lying flat transverse adhered to a closed backing material, such as aluminum, aluminum composite, grid-reinforced aluminum-polyethylene composite sheets, and similar sheets, or, for example, to paper webs. The individual slats are pressed together only under slight pressure and usually form no closed insulation layer. In order to have low combustible substance in the lamellar plate for fire protection reasons, the specific amounts of, for example, dispersion adhesives are very low. Process technology even easier, for example, aluminum-polyethylene composite films with the surface of the lamellae by heating the often only about 0.03 to 0.06 mm thick polyethylene film connect.

In the same way, slat plates can also be made from glass wool fiber webs with mineral fibers running at right angles to the large surfaces. The smooth mineral fibers are directed in these lamellae pronounced parallel to each other and very easy to compress against lateral forces, especially since the bulk densities are generally lower than that of the lamella plates made of rock wool insulation materials.

Lamellae can also be used to produce lamellar webs having widths of, for example, 500 mm or 1000 mm, thicknesses of approximately 20 mm to approximately 100 mm and lengths of several meters. Due to the orientation of the mineral fibers at right angles to the large surfaces can be flat surfaces, for example, provided by large ventilation ducts with a flat and relatively strong insulation layer. At the same time, due to the high compressibility in the direction of the width of the fins, i. in the longitudinal direction of the slat webs are easily performed around pipelines with small diameters and there give a uniform sheath. This behavior is favored by the joints between the individual lamellae, since here the transverse stiffening of the insulating material is interrupted.

Slat trajectories and slat plates with a small width allow for larger deformations at constant force than slat trays and slat plates with larger width. The possible bending radius of these insulating elements decreases with increasing insulation thickness and bulk density. The increasing with decreasing bending radius compression of the inner zones of the fiber web naturally leads to a considerable compression, but also to increase the compressive strength in these zones. Laminated webs are therefore like solid, but much more expensive to produce pipe shells as a supporting layer for the sheathing of pipes, for example, with smooth or profiled sheets of steel, aluminum, plastic films, gypsum or mortar layers. The right angles or, in the case of pipeline, radially to the insulated surfaces Aligned mineral fibers lead to an increase in the thermal conductivity of the insulating materials against such insulating materials, which have a laminar fiber structure or against pipe shells, in which the mineral fibers are arranged concentrically around the central axis of the pipeline.

The production of lamellae is complicated in terms of process engineering and leads to a low throughput speed of the production plants. The bonding technique is also substantially unsuitable for the partly heavy weight slats. An adhesive bond between adjacent lamellae can also be weakened by loose mineral fibers or mineral fiber fragments (dust) being present in the region of the adhesive surfaces.

Laminated lanes are rolled up tightly for storage and transport and wrapped in a covering. Here, the lamellae are stressed at the beginning and at the end of a role strong on shear. After unrolling these slats fall off easily. The lamellae are even thrown off when the lamella web is allowed to unroll itself after removal of the sheaths by the action of the large restoring forces. In this uncontrolled Austrollvorgang the end of the role whipping like a whip through the air, so that already partially detached lamellae are completely replaced by the acceleration or the strong impact of the end on the ground.

Furthermore, there is a risk that individual lamellae detach from the lamellar web if the lamellae are inadvertently folded outwards. Because of the initially inadequate strength of the connection of the lamellae and the negative effects in the handling of the lamellae webs, carrier layers which are only partially glued to the lamellae are largely eliminated. These include, for example, mesh fabric made of glass fibers or similar planar structures.

The lamella plates affixed as individual elements have the processing technology advantage that necessary separating cuts can either be made along the transverse joints between adjacent lamellae or these serve at least as an auxiliary line for the guidance of a cutting tool. The transverse joints can also be marked as a kink on the carrier layer to adapt by folding the slats, the slats in size with respect to the installation conditions.

A much more economical method for the production of insulating materials with the characteristic of lamellae, lamellar plates or lamellar sheets orientation of the mineral fibers is in the EP 0 741 827 B1 described. In this method, a thin primary nonwoven is unfolded by an up and down moving conveyor and placed endlessly and looped on a second conveyor. This creates individual layers which are pressed against each other in the horizontal direction and are compressed differently depending on the desired density of density. For this purpose, the primary fleece is guided between two pressure-resistant bands, which initially limit only the height of the primary fleece. Already hereby, the mineral fibers are aligned in the arcuately deflected tracks of the primary web parallel to boundary surfaces. To obtain largely flat surfaces, the primary nonwoven can also be actively compressed in the vertical direction.

This orientation of the mineral fibers in the primary non-woven can be done in a separate device, but is suitably made in conjunction with a curing oven. In the curing oven, the endless fibrous web between two pressure belts, of which at least one is movable in the vertical direction, flows through hot air in the vertical direction. The printing tapes have pressure-resistant elements with holes in which surface areas of the fiber web press, whereby the surfaces are profiled. In the two surfaces of the fiber web may lead to a further alignment of the mineral fibers, a further compression compared to the underlying areas and possibly to a slight binder enrichment.

With the aid of the heat energy transferred by the hot air, the fiber web with the binding and / or impregnating agents contained therein is heated, so that moisture present in the fiber web is expelled and the binders cure, in which they form connecting films or solids. After fixation of the fibrous web by solidification of the binder is shown in longitudinal section a structure in which the mineral fibers are oriented in the core of the primary web predominantly perpendicular to the large surfaces of the endless fiber web. In the near-surface areas, the mineral fibers are aligned parallel to the large surfaces. Because of the relatively high stiffness of the core of the primary nonwoven, the mineral fibers may also be mushroom-shaped and / or compressed downwards between the zones of mineral fibers running at right angles to the large surfaces, given correspondingly large vertical pressures. Between the arcuately deflected paths of the primary web generally remain small gussets that occur as different widths and different depths transverse grooves in the two major surfaces of the endless fiber web.

In the horizontal section, the higher-density zones with the mineral fibers running at right angles to the large surfaces differ significantly from the intermediate zones with a flat arrangement of the mineral fibers. In cross-section, the structure is less uniform than in insulation boards used to make fins. For example, the bending tensile strength is lower because of the inhomogeneity of the structure at a comparable density.

The shallow mineral fibers in the near-surface zones significantly reduce the thermal conductivity at right angles to the large surfaces. From the EP 1 321 595 A2 It is known that the transverse tensile strength between these mineral fibers is weak, so that these lying flat mineral fibers are removed to tighter connections of the insulation boards produced therefrom, for example, with cladding for the production of sandwich panels or when used as plaster base in thermal insulation composite systems to reach.

However, since the near-surface zones extend into the fibrous web, depending on the densification in the region of both large surfaces and down to depths of about 15 mm to about 35 mm, their removal is associated with considerable material losses, unless the separated zones themselves are used as insulation materials. Such coupling productions are considered difficult and will be avoided if possible.

From the EP 0 741 827 B1 Furthermore, the production of laminated Dämmfilzen is known in which the endless loop-shaped unfolded fiber web are glued on both large surfaces with support layers of aluminum foil and the fiber web is then cut centrally and parallel to their large surfaces, so that ultimately two equally thick and laminated fiber webs arise which are then rolled up. In the fibrous webs produced in this way and referred to as insulating felts, only a partial bonding with the carrier layer is possible. This partial bonding and the low transverse tensile strength of the mineral fibers leads to a low-strength composite whose connection is much less solid compared to a lamella plate or a lamellar mat of lamellae. However, this difference does not play a significant role in a continuously bonded fiber web, in particular when detaching the carrier layers at the two ends. However, the outer, unbacked compressible zones lead to bumps.

The EP 0 867 572 A2 further describes an insulating element made of mineral fibers, consisting of a mineral fiber fleece and / or a plurality of interconnected lamellae and at least one applied on a main surface lamination in the form of a film. This insulating element thus consists of a thin uniform fiber web of flat superimposed and interconnected individual mineral fibers with a thickness of less than 15 mm and a lamination and several interconnected slats. The lamination can be applied both on the thin fiber web and on the lamellae.

From the DD 248 934 A3 and in this known as the prior art EP 1 152 094 A1 as well as the DE 197 58 700 C2 Methods are known in which a fiber impregnated with binding and other additives fiber web divided into slats which are rotated by 90 ° and then pressed together horizontally and compressed vertically, so that lamellar tracks are formed. It is also envisaged that the individual slats are densified differently and formed of different materials. After joining the individual lamellae, the mineral fibers are oriented more or less at right angles to the large surfaces depending on the orientation in the original fiber web. Due to the indispensable vertical pressure, the mineral fibers present in the two near-surface zones are also bent over and fixed in a flat bearing.

Strengthening can be found in the in the EP 0 741 827 B1 as well as in the DD 248 934 A3 described method that the passing of the curing oven, the topmost, a few microns to millimeters thick zone of the fiber web is more compacted and enriched with binders, as the immediately underlying zones. Thus, a firmer contact with the lamination can be made, although the decisive for the use of transverse tensile strength of the fiber web is primarily influenced by the lower-lying zones.

Based on the above-described prior art, the invention therefore an object of the invention to improve a generic method for producing an insulating membrane made of mineral fibers to the effect that the produced insulating material with respect to their strength properties and their processability, especially in the field of building exterior surfaces and pipe jacket surfaces improved or is simplified. In addition, it is the object of the invention to provide a generic insulation web of mineral fibers bound with a binder, which has improved processing properties and in particular also improved strength properties and further properties of lamellae or lamella webs or plates in at least the same quality.

The solution of this problem provides in a generic method that on at least one of the separating surfaces of the two insulating material webs a lamination is applied. The solution to the problem with an insulating material web according to the invention provides that the lamination is arranged on the separating surface. The insulation webs according to the invention produced by the method according to the invention should have as possible with the basic characteristics of lamellar plates matching properties.

According to the invention, therefore, the lamination is not applied to the compressible, weakly bonded regions of the insulating material web, but to the cross-resistant and at the same time pressure-resistant parting surfaces, namely into regions with fibers oriented at right angles to the lamination. On the other hand, the surfaces arranged opposite the parting surfaces are compressible in the direction of their surface normals and can accordingly adapt to unevenness of the surface to be insulated, for example a building facade, while the separating surfaces arranged externally with the lining then remain extremely smooth. Flanges of ventilation ducts, sleeves or clamps in pipelines can be insulated up to a certain height, for example, with such insulating material webs, without this having an effect on the formation of the outer surfaces of the thermal insulation. Flanges of ventilation ducts, sleeves or clamps in pipelines can therefore be overlapped with a corresponding insulation sheet of mineral fibers such that the outer surface has no bumps.

The conditional by the primary unfolding of the primary nonwoven folds can act here as a bending or bending area, whereby the internally arranged surface of the insulating material according to a traverse more easily adapted to the externally arranged round surface of the surface to be insulated.

In insulating sheets for outdoor wall surfaces of a ventilated clothing, which are used for example in the form of roll-up Dämmfilze or insulation boards and are also used in the core insulation behind an outer masonry shell, resulting from the compressibility of the insulation material economic advantages in terms of processing and installation of the insulating material web according to the invention.

In addition, it can be provided in the method according to the invention that the mineral fibers extending in the large surfaces substantially parallel to the large surfaces are removed. As a result, even the large surfaces are machined so that in the large surfaces, a fiber course prevails substantially perpendicular to these large surfaces. By this development of the method according to the invention, on the one hand, an exact thickness of the insulating material web can be adjusted and, on the other hand, the strength properties are changed to the effect that the large surfaces of the insulating material webs are sufficiently pressure-resistant. Such formed insulating material track is similar in their properties of the basic characteristics of a slat mat. The removal of the mineral fibers extending essentially parallel to the large surfaces moreover has the effect of creating a visually appealing, in particular flat, large surface.

The fibrous web, which according to this invention is finally subdivided into at least two insulating material webs, has mineral fibers bound with binders, which if appropriate are impregnated by hydrophobizing and / or dust-binding agents or other additives and are of endless design. The mineral fibers are oriented in the interior of the fibrous web to near-surface areas predominantly perpendicular to the outer major surfaces of the fibrous web. Below the two large outer surfaces of the fiber web, the mineral fibers are oriented at decreasing angles to parallel to the large surfaces. In the areas of large surfaces, the mineral fibers may be bound in a higher density and with additional binders.

The fibrous web can be separated in front of a curing oven by the parallel to the large surfaces of the fibrous web or the secondary nonwoven separating cut to form the insulating material webs. The separating cut can be carried out centrally but also off-center, so that either two are the same Material thickness insulating material webs or insulating material webs of different material thickness can be produced. By separating cut the dividing surfaces are formed, are applied to the air-permeable and / or heat-resistant nonwovens, tissue and / or scrim. These laminations mentioned above can consist for example of glass, natural and / or organic man-made fibers. The chemical fibers can be formed, for example, from carbon, aramid, terephthalate, polyamide or polypropylene fibers or from mixtures of these above-mentioned chemical fibers.

Preferably, the laminations are tension-resistant, web-shaped laminations, wherein the laminations are formed in one or more layers. If the lamination has several layers, these layers can be formed from different fibers. In particular, for example, glass fiber random webs can be bonded to nonwoven webs of thermoplastic fibers or perforated thermoplastic films.

According to a further feature of the invention, it is provided that the tension-resistant, sheet-like laminations are bonded to the insulation web, in particular hot melt adhesives have been found suitable for this purpose, which are applied linearly and / or punctiform on the lamination and / or the parting surface of the insulating material.

In addition to the above effects, the laminations can also serve as outer reinforcing, protective, filtering and / or decorative layers.

For carrying out the method according to the invention, it has proved to be advantageous to arrange the lamination roll-shaped in the area between, resulting after the separation cut two insulation sheets and the separating surfaces of the insulating material webs before the so interconnected laminations and insulation webs are wound, the lamination is arranged inside the winding inside.

In the separation of the fiber web in the partial webs to be laminated, namely insulating material webs, it can lead to an impairment, namely reduction of the adhesiveness of the binder contained in the fibrous web. In order to counteract this impairment, the binders present in the fibrous web can be activated, for example, by solvents, in particular water. For this purpose, the insulating material webs run over contact rollers, through which they are wetted with the solvent. Alternatively or additionally, further binders, preferably in small quantities, can be sprayed onto the surfaces and the separating surfaces of the insulating material webs.

Alternatively, it can be provided that the lamination has at least on one side, at least on the surface facing the release surface, a thin layer of, for example, a high-viscosity dispersion adhesive or a water-silicate plastic adhesive filled, for example, with pigments, which is arranged as an impregnation. The prerequisite is that the lamination has sufficient material thickness to be able to support this thin layer. Of course, other adhesives can also be used, provided that they have a viscosity which makes it possible for the adhesives not to be absorbed by the insulating material webs, which frequently act in a suction capillary manner, so that the insulating webs subsequently saturate with brittle fragility with these adhesives. These negative effects are evident, for example, in the impregnation of glass fiber random or glass fiber fabrics with thermosetting resins, which are then subsequently applied to the release surface of the insulation sheet and fed together with the insulation web a curing oven for curing of the binder. When using a high-viscosity dispersion adhesive or a filled with pigments water-silicate plastic adhesive and a comparable adhesive a full-surface adhesion of the lamination on the release surface is possible because the lamination penetration of the individual mineral fibers in a perforation of a printing belt of the curing oven and thus prevent the formation of a surface embossing. In addition, no additional devices for curing the adhesive are needed and reduces the energy consumption for the curing of the adhesive.

The two insulation webs formed from the secondary nonwoven web can be brought together in front of the curing oven together with the laminations applied to the respective parting surfaces and passed together through the curing oven in which the binder of the secondary web and the adhesive between the lining and the parting surface solidified or cured by means of hot air become. Subsequently, the insulation webs thus formed can be trimmed in the longitudinal direction and cut to the appropriate length, wherein the cutting is carried out in lengths that lead to a wound insulation web or in shorter sections to insulation boards. The insulating materials made of the insulating material, for example, rockwool have densities between 23 kg / m ³ and 70 kg / m ³ , while corresponding insulating sheets of glass wool gross densities in the range between 12 kg / m ³ and 55 kg / m ³ have.

According to the embodiment described above, the secondary nonwoven is subdivided before the curing oven in the insulating material webs, which are provided before the curing oven with the laminations on the respective separation surfaces. Alternatively it can be provided that the secondary nonwoven is subdivided into the insulating material webs only after passing through the curing oven, which consequently can be connected to the lamination only after passing through the curing oven. In this case, the secondary nonwoven obtains its final structure before splitting into the insulating material webs by curing the binder in the curing oven. The separating cut is carried out with a band saw, with emerging sawdust being sucked off immediately in the area of the band saw so that it does not adhere to the separating surfaces and adversely affects the bonding of the lining to the insulating material webs.

The adhesive for bonding the insulating material webs with the laminations is applied either directly to the parting surfaces of the insulation webs or to the lamination, if the laminations are not already formed at the factory with a corresponding adhesive layer.

In addition to the air-permeable and heat-resistant laminations already mentioned above, it is also possible to use films as laminations. For example, an aluminum-polyethylene composite film is suitable as a lining for the purposes described above. This aluminum-polyethylene composite film may also be reinforced with fiberglass mesh. The polyethylene layer is heated during the application of the lamination on the parting surface of the insulating material web by means of a follower heating roller, so that this polyethylene layer softens and welded to the tips of the mineral fibers of the insulation web.

In the method according to the invention, it can be provided that the two insulating material webs formed from the secondary nonwoven web are formed identically so that both insulating webs also carry identical laminations. But there is also the possibility that the two insulation webs are formed differently, in particular with regard to the lamination without further notice. It has already been pointed out above that the two insulating material webs can have different material thickness, if the separating cut is not performed centrally. In addition, the two insulating material webs produced from a secondary nonwoven can also be formed differently with regard to the type and material thickness of the lining. Furthermore, it is also possible to form only one insulation web with a lamination, while the second insulation web continues to process without lamination, for example, is wound up. There is also the possibility of winding up an insulation web with lamination, while the second insulating web is subdivided with or without lamination in insulation boards. Of course, it is also possible to wind the wound-up insulating web without lamination, while the second insulating web is glued before its division into insulation boards with at least one lamination.

According to a further feature of the invention, it is provided that the laminations are trimmed edge-side together with the insulating material webs, so that the laminations are flush with the insulating material webs.

When using inventive insulating material for the insulation of pipes they are running with their longitudinal axis direction Narrow sides arranged adjacent to each other on the pipe, so that forms a complete insulation of the pipeline. The transition region of the joints of adjacent insulating material webs can in this case be covered in a simple manner with self-adhesive film strips, since the corresponding insulation webs have sufficient rigidity, which is otherwise given only in known from the prior art lamellar mats. However, the self-adhesive film tapes can also already be part of the lamination, as far as it extends beyond a longitudinal edge region of the insulating material web. Thus formed, the insulating material web according to the invention is particularly suitable for the insulation of pipelines, which serve to guide media whose temperature is below ambient temperatures. With this embodiment, the penetration of water vapor can be reliably prevented, as far as the lamination is formed of vapor-damping composite films, of which an edge region protrudes over an extending in the longitudinal axis direction of the insulating material side surface, so that this edge region can be adhered to the lamination of an adjacently arranged insulation web.

In addition to an embodiment of an insulating material according to the invention with a one-sided protruding edge region of the lamination of course, an embodiment is conceivable in which the lamination projecting beyond two, in particular parallel edge regions of the insulating material web. In order to facilitate the winding of such insulation web, it can be provided that at least in the region of a protruding edge region of the lamination, a thin paper strip is rolled up with.

It is provided according to a further feature of the invention that the glued laminations, in particular the glued films have markings. If the lamination is formed as an aluminum foil, it is possible in this connection to provide regularly recurring imprints or markings in the form of, for example, beams or arrows applied with the aid of paints. It has proven to be sufficient if the markers are arranged in both extending in the longitudinal axis direction of the insulating material edge regions and have a length between 2 and 10 cm. In the alternative, are The markings arranged at intervals of about 10 cm, so that the markings are used in particular as an aid in cutting the insulating material webs. If the markings are designed as arrows, they can also indicate the conveying direction of a medium in a pipeline or a ventilation duct.

With correspondingly resistant laminations which contain heat-discoloring substances, for example binders, the markings can also be applied by means of a laser beam.

Figur 1

einen ersten Abschnitt einer schematisch dargestellten Anlage zur Herstellung einer Dämmstoffbahn aus Mineralfasern und

Figur 2

einen zweiten Abschnitt der Anlage zur Durchführung des Verfahrens zur Herstellung einer Dämmstoffbahn aus Mineralfasern gemäß Figur 1.

Further features and advantages of the invention will become apparent from the following description of the accompanying drawings, in which an embodiment of a system for carrying out a method for producing an insulation sheet of mineral fibers is shown. In this drawing show:

FIG. 1

a first section of a schematically illustrated plant for the production of an insulating sheet of mineral fibers and

FIG. 2

a second section of the plant for carrying out the method for producing an insulating sheet of mineral fibers according to FIG. 1 ,

FIG. 1 shows the first section of a plant 1 for producing an insulating material web 2 ( FIG. 2 The mineral fibers 3 are made of a silicate material, for example natural and / or artificial stones, by melting the silicate material in a cupola 4 and feeding the melt 5 to a fiberization unit 6. The fiberizing unit 6 has a plurality of spinning wheels 7 driven in rotation, of which in FIG. 1 only a spinning wheel 7 is shown.

The cupola 4 has on the output side a spout 8, via which the melt 5 flows from the cupola 4 to the spinning wheels 7.

Due to the rotational movement of the spinning wheels 7, the mineral fibers 3 are formed from the melt 5 and collected on a first conveyor belt 9. On this first conveyor belt 9, a primary nonwoven fabric 10 is formed, in which the mineral fibers 3, which are mixed with binder in the fiberizing aggregate 6, are aligned in substantially the same direction and arranged in a laminar manner. The primary nonwoven 10 is then transferred to a downstream processing station 12 via a second conveyor belt 11 which, in contrast to the first conveyor belt 9, is not a collecting conveyor belt but a transport conveyor belt.

In the processing station 12, the general transport direction of the primary web 10 is changed. This change takes place from the original longitudinal direction into a transport in the original transverse direction of the primary web 10. The conveying direction is in FIG. 1 represented by an arrow 13.

The primary web 10 is transported over a roller 14 whose purpose is to change the transport direction of the primary web 10 from a substantially horizontal direction in a substantially vertical direction to supply the primary web 10 to another processing station 15. This further processing station 15 has two parallel conveyor belts 16, 17, between which the primary web 10 is guided. The conveyor belts 16, 17 are arranged to oscillate and oscillate the primary web 10 at right angles to its longitudinal extent as a secondary web 18 on a further conveyor, not shown, which runs parallel to the conveyor belts 9 and 11.

The thus suspended secondary web 18 is then fed to a compression station 19, in which the secondary web 18 is compressed. The compacting station 19 has an upper conveyor belt 20 and a lower conveyor belt 21, between which the secondary web 18 runs. The two conveyor belts 20 and 21 of the compression station 19 are arranged in a pendulous manner and, in addition to the function of compacting the secondary web 18, also function to aufzupreln the compacted secondary web 18 in the longitudinal direction meandering. This floating of the secondary web 18 causes the secondary web 18 in its central region has an orientation of the mineral fibers 3, the right angle is aligned to the large surfaces 22, 23. In zones immediately below the large surfaces 22, 23, the secondary nonwoven 18 has an orientation of the mineral fibers 3 that are at an angle other than the orthogonal to the large surfaces 22, 23 to a parallel orientation relative to these large surfaces 22, 23 varied. This arrangement and orientation of the mineral fibers 3 in the secondary web 18 results from the swaying of the secondary web 18 following the compression station 19.

The suspended secondary web 18 is fed immediately after the swaying of a processing station 24, which has an upper conveyor belt 25 and a lower conveyor belt 26 and their conveying speeds compared to the conveying speed of the compression station 19 is lower, so that the suspended Sekundärvlies 18 compressed in its longitudinal direction and the individual meander of the suspended Sekundärvlieses 18 are pushed together.

The processing station 24 is followed by a further processing station 27, which also has an upper conveyor belt 28 and a lower conveyor belt 29, between which the suspended secondary web 18 is conveyed. The processing station 27 has a further reduced conveying speed of the secondary web 18 in order to continue the compaction and the homogenization of the suspended secondary web 18.

The thus prepared secondary web 18 forms an end product, which can be further processed to form certain insulating material webs 2 of mineral fibers 3, such as insulation boards or insulating material webs 2, as described below in relation to FIG. 2 is described.

The meandering unfolded and compressed secondary web 18 is fed to a curing oven 30 by two parallel conveyor belts 31 and 32 are arranged. In the hardening furnace 30 hot air is conveyed through the conveyor belts 31, 32 and thus also through the secondary nonwoven 18, which hot air cures the binder contained in the secondary nonwoven 18 for connecting the individual mineral fibers 3. Due to the curing of the binder is the Secondary web 18 in its geometric shape, which it has received before the curing oven through the processing stations 12, 15, 19 and 24 and 27 fixed.

The distance between the two conveyor belts 31, 32 in the curing oven 30 is set to the material thickness of the secondary web 18 and limited by the conveying speed of the conveyor belts 31, 32 in relation to the amount of hot air required to cure the binder.

Subsequent to the curing oven 30, the secondary web 18 passes through a first sawing station 33, which has a band saw 34 with a band-shaped saw blade 35, with which saw blade 35 divides the secondary web 18 by a separating cut parallel to the large surfaces 22, 23 into two insulation webs 2 each having a large surface 22, 23 and a substantially coextensive, the respective large surface 22, 23 opposite separating surface 36 have.

The secondary web 18 having a width of 2,400 mm is then subdivided into four part webs by a circular saw with a circular saw blade 37 in the longitudinal direction, each sub web ultimately forming an insulating web 2 and having a width of 1,200 m.

The insulation webs 22 separated in the longitudinal direction by the separating cut parallel to the large surfaces 22, 23 of the secondary nonwoven 18 are lifted apart from one another and fed to a laminating station 38 in which a lining 39 is applied to the separating surfaces 36 of the insulating webs 2. The lamination 39 is hereby stored for each insulating material web 2 as a laminating roll 40, wherein the lamination 39 is deducted with the promotion of the insulating material web 2 of the laminating roll 40 and bonded to the same surface with the insulating material web 2. Following the laminating station 38, the insulation webs 2 are wound up and packed. For this purpose, the insulating material webs 2 are cut to length in a predetermined length of the secondary web 18 by a section perpendicular to the longitudinal direction of the insulating material web 2.

The liner 39 is formed as an air-permeable and heat-resistant nonwoven fabric of glass fibers and forms an outer reinforcing, protective, filtering and decorative layer. The connection of the lamination 39 with the insulating material web 2 in the laminating station 38 is effected by a sprayed onto the insulating material 2 high-viscosity dispersion adhesive, which is sprayed over the entire surface, selectively or in strips depending on the required connection between the lining 39 and the insulating material 2 and its adhesive effect. The lamination 39 is arranged on the separating surface 36 of the insulating material web 2, so that the lamination 39 is connected to the fiber tips at right angles to the separating surface 36 of the insulating material web 2. It may additionally be provided that, prior to winding the insulation web 2, the mineral fibers 3 present in the region of the large surfaces 22, 23, which deviate from a rectangular orientation to the large surfaces 22, 23, are removed by cutting or grinding.

Claims (36)

1. A method for producing a web of insulating material made of mineral fibres, in particular rock wool and/or glass wool, wherein the mineral fibres are produced from a melt and are deposited onto a conveyor as a primary non-woven material, the primary non-woven material is wrinkled perpendicular to its longitudinal extension and is deposited as a secondary non-woven material onto a second conveyor, subsequent the secondary non-woven material is moved such that the mineral fibres extend perpendicular to the large surfaces of the secondary non-woven material and the secondary non-woven material is subsequently divided into at least two webs of insulating material by means of a separating cut parallel to the large surfaces of the secondary non-woven material, said webs of insulating material respectively comprising a large surface and a fractured surface, said fractured surface having substantially the same area as the large surface and which is arranged opposite said large surface, characterized in that a lamination (39) is applied to at least one of the fractured surfaces (36) of said two webs of insulating material (2).
2. The method according to claim 1, characterized in that the mineral fibres (3) in said large surfaces (22, 23) which extend substantially parallel to said large surfaces (22, 23) are removed.
3. The method according to claim 1, characterized in that said webs of insulating material (2) are fed to a hardening furnace (30) before and/or after applying the lamination (39), in which hardening furnace (30) a bonding agent already contained in the primary non-woven material (10) is hardened.
4. The method according to claim 1, characterized in that the separating cut for forming the webs of insulating material (2) is made centrally between the said large surfaces (22, 23) of the secondary non-woven material (18).
5. The method according to claim 1, characterized in that said lamination (39) is applied as an air-permeable and/or heat-resistant non-woven, woven or two-dimensional structure, in particular from glass and/or natural fibres or organic chemical fibres like e.g. from carbon, aramide, terephthalate, polyamide, polypropylene or mixtures thereof or as a foil, for example an aluminium-polyethylene composite foil, and at least in one layer and particularly in the form of tension-resistant webs.
6. The method according to claim 1, characterized in that the lamination (39) is applied in several layers, said layers of the lamination (39) being preferably formed differently from each other.
7. The method according to claim 6, characterized in that the layers of the lamination (39) made of a glass fibre tangled web are connected to layers made of tangled webs from thermoplastic fibres and/or perforated foils from thermoplastic materials.
8. The method according to claim 1, characterized in that said lamination (39) is bonded to the web of insulating material (2), wherein said bonding is preferably effected over a partial area, particularly in the form of lines or dots, and wherein for example heat-sealing adhesives are used.
9. The method according to claim 1, characterized in that said lamination (39) is formed as an external reinforcement, protection, filter and/or decorative layer.
10. The method according to claim 1, characterized in that said lamination (39) is drawn off a roll (40) and is fed together with the web of insulating material (2) to a processing station (38), where said lamination (39) is connected to said web of insulating material (2).
11. The method according to claim 10, characterized in that several layers of said lamination (39) are drawn off a roll (40).
12. The method according to claim 1, characterized in that bonding agents present in said web of insulating material (2) are activated by means of solvents like for example water, prior to being connected to the lamination (39).
13. The method according to claim 12, characterized in that the activation of said bonding agents is effected by means of contact rollers.
14. The method according to claim 1, characterized in that said bonding agent is sprayed onto the fractured surface (36) of the web of insulating material (2), prior to applying the lamination (39).
15. The method according to claim 1, characterized in that between said web of insulating material (2) and said lamination (39) a layer of an impregnation, particularly made of a highly viscous dispersion binder or a pigment-filled water-silicate synthetic binder is arranged.
16. The method according to claim 1, characterized in said impregnation is applied at a high viscosity, so that said impregnation is not absorbed by said lamination (39).
17. The method according to claim 1, characterized in that said two webs of insulating material (2) are brought together after the application of the laminations (39) and together are supplied to a hardening furnace (30).
18. The method according to claim 17, characterized in that said webs of insulating material (2) after leaving said hardening furnace (30) are trimmed in the longitudinal direction thereof, are cut to length and are rolled up or divided into single insulation boards and supplied to a packaging station.
19. The method according to claim 1, characterized in that mineral fibre dust occurring during the separation of the secondary non-woven material (18) into webs of insulating material (2) are removed and particularly exhausted prior to the application of the lamination (39).
20. The method according to claim 5, characterized in that said foil is reinforced by a two dimensional glass-fibre netting.
21. The method according to claim 5, characterized in that said aluminium-polyethylene composite foil is heated in such a way that the polyethylene layer is softened and becomes welded to the mineral fibre tips of the web of insulating material (2).
22. The method according to claim 1, characterized in that said lamination (39) is formed of different layers.
23. The method according to claim 1, characterized in that the lamination (39) is formed larger in area than said fractured surface (36), so that said lamination (39) projects especially over at least one longitudinal side of said web of insulating material (2).
24. The method according to claim 1, characterized in that markings are arranged on said lamination (39) which serve for cutting said web of insulating material (2) to length.
25. A web of insulating material made of mineral fibres bound with at least one bonding agent, particularly from mineral wool and/or glass wool, comprising a large surface and a fractured surface, said fractured surface being formed at the division of a secondary non-woven material into two webs of insulating material, wherein said mineral fibres in the region of said fractured surface are arranged to extend perpendicular to the fractured surface and in the region of the surface at an angle deviating from 90° in relation to the large surface, in particular parallel to the large surface, and comprising a lamination, characterized in that said lamination (39) is arranged on the fractured surface (36).
26. The web of insulating material according to claim 25, characterized in that said lamination (39) is formed as an air-permeable and/or heat-resistant non-woven, woven or two-dimensional structure, in particular from glass and/or natural fibres or organic chemical fibres like e.g. from carbon, aramide, terephthalate, polyamide, polypropylene or mixtures thereof or as a foil, for example an aluminium-polyethylene composite foil, and at least in one layer and particularly in the form of tension-resistant webs.
27. The web of insulating material according to claim 25, characterized in that said lamination (39) is formed in several layers, with said layers of said lamination being preferably formed differently from each other.
28. The web of insulating material according to claim 25, characterized in that said layers of the lamination (39) made of a glass fibre tangled web are connected to layers made of tangled webs from thermoplastic fibres and/or perforated foils from thermoplastic materials.
29. The web of insulating material according to claim 25, characterized in that said lamination (39) is bonded to the web of insulating material (2), wherein said bonding is preferably effected over a partial area, particularly in the form of lines or dots, and for example with a heat-sealing adhesive.
30. The web of insulating material according to claim 25, characterized in that said lamination (39) is formed as an external reinforcement, protection, filter and/or decorative layer.
31. The web of insulating material according to claim 25, characterized in that between said web of insulating material (2) and said lamination (39) a layer of an impregnation, particularly made of a highly viscous dispersion binder or a pigment-filled water-silicate synthetic binder is arranged.
32. The web of insulating material according to claim 25, characterized in that the impregnation has a high viscosity, so that the impregnation is not absorbed by the lamination (39).
33. The web of insulating material according to claim 26, characterized in that the foil is reinforced by a two-dimensional glass-fibre netting.
34. The web of insulating material according to claim 25, characterized in that said lamination (39) is formed of different layers.
35. The web of insulating material according to claim 25, characterized in that said lamination (39) is formed larger in area than said fractured surface (36), so that said lamination (39) especially projects over at least one longitudinal side of said web of insulating material (2).
36. The web of insulating material according to claim 25, characterized in that markings are arranged on said lamination (39) which serve for cutting said web of insulating material (2) to length.

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