AT15715U1 - Multi-layer vapor barrier - Google Patents

Abstract

The invention relates to a multi-layer vapor barrier layer (1) for sealing structures, in particular for roof waterproofing, comprising at least a first protective layer (3) of a polyethylene terephthalate film (PET), a glass fibers (7) or glass fibers crossing through a layer of, in particular, regular intersecting glass fibers reinforced vapor-blocking aluminum layer (2), in particular an aluminum foil, a second protective layer (4) and with an acrylate-based pressure-sensitive adhesive (5) for simple, stationary fixation of the vapor barrier layer (1), wherein the first protective layer (3) and the second protective layer (4 ) each consist of a polyethylene terephthalate film (PET), wherein the material thickness of the second protective layer (4) is at least twice as large as the material thickness of the first protective layer (3), and in that the glass fibers (7) in the aluminum layer (2) embossed and enclosed with adhesive, that the second protective layer (4) is flat and the aluminum Schi (2) and the first protective layer (3) abut against it at least in a circumferential section of the in particular circular cross-section of the glass fibers (7) or glass threads of more than 40%, in particular more than 50% of the circumference.

Description

description

MULTILAYER STEAM SPRING LAYER

The invention relates to a multi-layer vapor barrier layer for sealing of structures, in particular for roof waterproofing, with at least a first protective layer of a polyethylene terephthalate film (PET), reinforced by a layer of each other in particular regularly crossing glass fibers or glass fibers vapor-blocking aluminum layer, in particular one Aluminum foil, a second protective layer and with an acrylate-based pressure-sensitive adhesive for easy, fixed fixation of the vapor barrier layer.

Such a multi-layer structure is used in practice to create an effective vapor barrier in roof structures. This prevents vaporous moisture from escaping from the interior of the building in the roof structure and condenses there. Pure plastic layers have proven in practice often not sufficiently tight, so that they act only as a vapor barrier layer.

At present, a PET-aluminum-PET composite is provided on the underside with a stapled glass scrim and then provided this with a kaltselbstklebenden bitumen layer for the preparation of this special vapor barrier roofing membranes.

Above the multi-layer structure is in practice still an insulating layer, for example made of a polystyrene, as well as the protection against weathering serving, rain-tight Dachabschlussebene, for example, a roof top layer of bitumen or plastic provided.

To improve the tensile strength of the thin aluminum web, it is known to laminate on both sides of plastic layers of a PET on the aluminum web. This allows the aluminum web or film to be easily processed on high speed converting machines. The aluminum can be exposed through the plastic layers higher mechanical loads than comparable simple aluminum sheets.

From DE 20 2015 003 680 U1 a multi-layer composite waterproofing as building waterproofing with at least one vapor barrier separating layer made of aluminum and connected to the release layer fabric layer, for example as a roof barrier or flat roof barrier on a trapezoidal roof or concrete flat roof is known. The fiberglass fabric layer, for example, has a crossed thread system consisting of warp threads and weft threads, in which the threads are fixed by a binding, and is connected to a lower protective layer of low density polyethylene by means of fusing and / or gluing. An upper protective layer is preferably made of a PET film. On a first side of the composite seal, an adhesive strip may be disposed, for example, with an acrylate adhesive.

EP 1 344 875 A2 relates to a vapor and wind barrier web which is reinforced with a composite material, for example made of a metal foil, protected on one side or on both sides with lacquers or films of inorganic / organic lattices and which is coated from partially or completely, fire retardant adhesives or heat-bondable layers is built and can be installed quickly and easily. Advantageous metal supports are pure metal foils of aluminum or copper. In order to ensure a good processability of the steam / wind barrier web according to the invention, an inorganic / organic lattice or fabric system, such as, for example, glass scrims, glass cloths or glass webs can be laminated.

Furthermore, DE 37 21 715 A1 relates to a composite material of aluminum and glass fiber mats with thermal insulation and double-sided moisture barrier.

In addition to the sealing properties of such vapor barrier layers, the DIN 18234 concerning the structural fire protection large-area roofs is to be considered, in which the requirements for the flammability and calorific value of vapor barriers in Dachschalun conditions are described from steel trapezoidal profiles. Accordingly, the calorific value of combustible vapor barriers, such as roofs with load-bearing roof trays made of steel trapezoidal profiles with a waterproofing of 10,500 kJ / m2, must not be exceeded. It follows a general need to choose a structure of the vapor barrier layer so that the calorific value is as low as possible.

Against this background, the present invention seeks to provide a vapor barrier layer, which has a high tensile strength at the same strength compared to vapor barrier layers according to the prior art, so as to increase the bearing strength of the vapor barrier composite on trapezoidal sheets, and at the same time to achieve very low calorific value.

This object is achieved with a vapor barrier layer according to the features of claim 1. The subclaims relate to particularly expedient developments of the invention.

According to the invention, therefore, a vapor barrier layer is provided in which the first protective layer and the second protective layer each consist of a polyethylene terephthalate film (PET), wherein the material thickness of the second protective layer is at least twice as large as the material thickness of the first protective layer, and that the glass fibers are enclosed in the aluminum composite in such a way that the second protective layer is substantially planar and the aluminum protective film and the first protective layer at least in a peripheral portion of the particular circular cross section of the glass fibers or glass fibers of more than 30%, in particular more than 50% of the circumference this is present. In this way, in the vapor barrier layer, for the first time, a composite with a particularly low thickness, a high tensile strength in relation to the prior art vapor barrier layer of the same thickness is realized with the effect of increasing the load-bearing capacity of the vapor barrier composite on trapezoidal sheets and a simultaneously low calorific value. By using double-sided embedded thin glass fibers or glass fibers in the aluminum layer, a mechanical interlocking is achieved to produce a positive connection between the glass fibers and the aluminum composite web, resulting in a relative increase in tensile strength of the entire vapor barrier layer, due to a separate arrangement of the glass fibers and the aluminum layer could not be achieved with a bond. As a result, not only can the required amount of adhesives be reduced or even dispensed with, but at the same time the material thickness of the aluminum layer and / or the glass fibers can be reduced, so that the vapor barrier layer has a significantly lower calorific value than the prior art. The non-positive bond creates the possibility of reducing the thickness of the aluminum foil without risk of tearing, for example to about 7 pm.

By the outer side of the lower protective layer is flat, so undergoes no deformation by the glass fibers, which are inventively molded or embossed in the layers lying on it, the further processing of the vapor barrier layer is simplified and so the costs are reduced. Very thin adhesive layers or adhesive coatings can be applied to the outer surface of the second protective layer on the underside, only comparatively small amounts, for example 15 to 20 g / m 2 pressure-sensitive adhesive, being required to produce the required adhesion forces. The use of thinner pressure-sensitive adhesive layer thicknesses compared to those usual on the market reduces the calorific value that is important for the end product. Even more, the smooth surface of the underside with a small amount of the applied adhesive layer can provide a higher adhesion to smooth surfaces such as trapezoidal sheets. By skilfully using a smooth vapor barrier underside, in contrast to the hitherto customary rough undersides, one can avoid weak spots with a low layer thickness with the same amount of adhesive used. As a result, the adhesive force is increased on average.

According to the invention results from the embossing of the glass fibers still another advantage by the two-sided and additionally overlapping in the edge region inclusion of the reinforcing glass fibers with two superimposed laminated plastic films moisture absorption by possible capillary action of the threads and fiber ends specially reduced or prevented at the edge and thus the protection of aluminum foil against chemical

Influences is improved.

By the second protective layer undergoes no deformation, for this purpose, plastic films of greater hardness and lower elasticity can be used, in particular a PET film.

In this case, the term of crossing glass fibers is not limited to a certain angle according to the invention. In particular, according to the invention, such embodiments should also be included, in which the glass fibers intersect each other at an angle other than 90 °.

By the preferred use of both sides by plastic or aluminum foils enclosed glass fibers, such as 34Tex, and their weitmaschiger arrangement with a distance of, for example 12 mm, a thin glass fabric or Glasgelege is realized with the effect that the entire vapor barrier layer has a comparatively low Has strength, and so the calorific value is reduced.

By creating a highly effective mechanical bond between the glass fibers and the aluminum layer, the diameter of the individual glass fibers can be significantly reduced over the prior art. It is particularly advantageous if the glass fibers have a diameter between 80 pm and 120 pm, preferably between 90 pm and 110 pm, for example about 100 pm. Due to the comparatively small diameter, such glass fibers or glass fibers are particularly suitable for forming and thus undercut in the aluminum layer. It is assumed based on the current state of knowledge that the transferable tensile force and / or load capacity can be further increased by a voltage applied over as large a peripheral portion of the glass fibers aluminum layer.

Particularly preferably, the glass fibers are arranged in a context with 0.8 to 3 threads per 1 cm, preferably 0.8 threads per 1 cm, or with a distance of the glass fibers of about 12 to 5 mm, preferably 12 mm , As a result of the comparatively large mesh size, a good composite adhesion is achieved in the composite of the vapor barrier layer, in which the surface portions of the direct connection between the first protective layer and the aluminum layer are correspondingly large.

Furthermore, it has already proved to be advantageous if the pressure-sensitive adhesive is applied as an acylate adhesive in an amount of about 15-20 g / m 2. As a result, the calorific value of the vapor barrier layer is further reduced. The comparatively small amount of the pressure-sensitive adhesive is made possible by the efficient bonding of the aluminum layer to the glass fibers, which already form a highly loadable bond within the vapor barrier layer due to the mechanical interlocking and an approximately complete thread re-connection and at the same time offer a flat underside coating surface. The required amounts of the laminating adhesive between the first and the second protective layer on the one hand and the aluminum layer on the other hand can thus also be significantly reduced by the abovementioned skillful connection of the structure.

Due to the different thickness of the protective layers of PET can be achieved in the manufacturing process of the vapor barrier layer according to the invention by means of pressure rollers in a simple manner, a structure in which the stronger of the two protective layers maintains their flat, flat shape, while the thinner protective layer to the through the glass fibers certain surface topography is pulled around, so absorbs their surface texture. For this purpose, the PET film of the first protective layer preferably has a material thickness of approximately 12 μm and the PET film of the second protective layer has a material thickness of approximately 36 μm.

In order to achieve a particularly effective connection of the thermal insulation composite, the first protective layer of the vapor barrier film has an outer side facing away from the aluminum foil, which has a precoat for bonding with an insulation based on polyurethane (PUR). In this way, an insulation and an outer cover can be constructed on the vapor barrier layer according to the invention, which receives the necessary strength and resilience by respective bonds, so that in particular installation aids, which penetrate the thermal insulation composite, can be dispensable in individual cases. This significantly minimizes the risk of unwanted transmission of environmental influences.

By means of the pressure-sensitive adhesive, the connection to the substrate, for example a trapezoidal sheet, or the connection to adjacent vapor barrier layers is realized in a simple manner without additional aids. For assembly, only a protective film designed as a peel-off film is to be removed, so that the bonding then takes place reliably and permanently by pressing. Preferably, the pressure-sensitive adhesive is applied in a dosage of about 15 to 20 g / m 2 to the second protective layer.

In another, also particularly promising embodiment of the invention, the outside of the first protective layer has reflection-inhibiting and / or slip-resistant properties, so as to simplify the processing of the vapor barrier layer. The vapor barrier layer connected to the substrate by means of the pressure-sensitive adhesive is immediately loadable and in particular puncture-proof, so that no additional safety measures are required. The anti-reflective properties reduce unwanted glare due to incident solar radiation.

The brightness impression is significantly determined by a development of the invention, in which the first protective layer is colored on the underside and is visible through the transparent or transmissive first protective layer. As a result, a dark coloration leads to an overall darker overall impression of the vapor barrier layer.

Another, also particularly practical embodiment of the invention is for better connection of adjacent vapor barrier layers achieved in that a particular peripheral edge region of the vapor barrier layer is made free of glass fibers and glass fibers, so that in this edge region on both sides even design of the vapor barrier layer in combination with the overall reduced thickness of the layer construction allows easy connection to an adjacent vapor barrier layer of the same or another type.

The invention allows for various embodiments. To further clarify its basic principle, one of them is shown in the drawing and will be described below. FIG. 1 shows a plan view of the multilayer vapor barrier layer according to the invention; FIG. Fig. 2 is a along the line ll-ll cut and enlarged view of a

Section of the vapor barrier layer shown in Figure 1.

The vapor barrier layer 1 according to the invention will be explained in more detail below with reference to Figures 1 and 2. The multi-layer vapor barrier layer 1 serves to seal buildings, in particular roofs of commercially used buildings, wherein a highly efficient vapor barrier is achieved by an aluminum layer 2 designed as an aluminum foil with a thickness of 6 μm to 8 μm. Thus, the aluminum layer 2 forms the main functional constituent of the vapor barrier layer 1. The further layers described below serve to protect and reinforce the aluminum foil. The outer, each formed by PET films layers are realized by a transparent first protective layer 3, which forms a connection for an insulation, not shown, and by a transparent second protective layer 4, which forms a connection for a roof surface, not shown. Both protective layers 3, 4 are equipped for fast and reliable production of a thermal insulation composite system with a corresponding nature of the outside, wherein the first protective layer 3, a suitable surface coating for a PUR adhesive and the outside of the second protective layer 4, an acrylate-based pressure-sensitive adhesive 5 with a Surface weight of about 15 to 20 g / m2, which is provided with a protective film 6 made of silicone-coated plastic film, which can be easily removed for use.

Between the upper, first protective layer 3 and the aluminum layer 2, with the exception of one edge region 9, glass fibers 7 are introduced as a regular lattice-like layer 8 with a mesh width (distance a) of approximately 12 mm, which, above all, substantially increases the tensile strength and, in addition, tearing effectively prevent. An essential idea of the invention is to glue the glass fiber layer 8 glued into the aluminum layer 2 in such a way that a glued and mechanically clamped connection of these two components is produced, which not only substantially increases the load capacity but also considerably increases the amount of adhesive required in the surface reduced. Thus, when the second protective layer 4 is substantially planar and the aluminum layer 2 rests against its circumference at least in a circumferential section of the circular cross section of the respective glass fiber 7, which corresponds to approximately 40% to 70% of the total circumference, unwanted caverns 10 become between the first protective layer 3 and the aluminum layer 2 on both sides of the glass fibers 7 is reduced to a minimum and generates an undercut which forms a tensile strength-increasing unit even without adhesive. The material thickness of the second protective layer 4 corresponds to 36 times three times the material thickness of 12 μm of the first protective layer 3.

Claims (11)

claims 1. multi-layer vapor barrier layer (1) for sealing of structures, in particular for roof waterproofing, with at least a first protective layer (3) of a polyethylene terephthalate film (PET), one through a layer of each other in particular regularly crossing glass fibers (7) or glass threads reinforced vapor-blocking aluminum layer (2), in particular an aluminum foil, a second protective layer (4) and with an acrylate-based pressure-sensitive adhesive (5) for simple, stationary fixation of the vapor barrier layer (1), characterized in that the first protective layer (3) and the second protective layer (4) each consist of a polyethylene terephthalate film (PET), wherein the material thickness of the second protective layer (4) is at least twice as large as the material thickness of the first protective layer (3), and in that the glass fibers (7) in the Aluminum layer (2) embossed and enclosed with adhesive, that the second protective layer (4) is flat and the aluminum Layer (2) and the first protective layer (3) at least in a peripheral portion of the particular circular cross section of the glass fibers (7) or glass fibers of more than 40%, in particular more than 50% of the circumference abut against this. 2. vapor barrier layer (1) according to claim 1, characterized in that the glass fibers (7) have a diameter between 50 pm and 140 pm, preferably between 80 pm and 110 pm, for example about 90 pm. 3. vapor barrier layer (1) according to claims 1 or 2, characterized in that the glass fibers (7) in a context with 3 to 0.3 threads per 1 cm, preferably 0.8 threads per 1 cm or at a distance (a ) of the glass fibers (7) of 5 mm to 15 mm, preferably about 12 mm are arranged. 4. vapor barrier layer (1) according to at least one of the preceding claims, characterized in that the pressure-sensitive adhesive (5) is designed as an acylate adhesive. 5. vapor barrier layer (1) according to at least one of the preceding claims, characterized in that the pressure-sensitive adhesive (5) applied in a dosage of 10 to 30 g / m2, in particular from 15 to 20 g / m2 on the planar second protective layer (4) is. 6. vapor barrier layer (1) according to at least one of the preceding claims, characterized in that the PET film of the first protective layer (3) has a material thickness of 8 pm to 23 pm, in particular about 12 pm. 7. vapor barrier layer (1) according to at least one of the preceding claims, characterized in that the PET film of the second protective layer (4) has a material thickness of 23 pm to 50 pm, in particular about 36 pm. 8. vapor barrier layer (1) according to at least one of the preceding claims, characterized in that the first protective layer (3) has an aluminum layer (2) facing away from the outside, which has a pre-coating for bonding based on polyurethane (PUR). 9. vapor barrier layer (1) according to at least one of the preceding claims, characterized in that the outer side of the first protective layer (3) has reflection-inhibiting and / or slip-resistant properties. 10. vapor barrier layer (1) according to at least one of the preceding claims, characterized in that the first protective layer (3) and the aluminum layer (2) have a coloring. 11. vapor barrier layer (1) according to at least one of the preceding claims, characterized in that at least one, in particular both lateral edge regions (9) of the vapor barrier layer (1) are made free of glass fibers (7) and glass fibers.