WO2007038812A1

WO2007038812A1 - Composite film

Info

Publication number: WO2007038812A1
Application number: PCT/AT2006/000392
Authority: WO
Inventors: Hermann Pichler; Reinhold Jungwirth; Stefan Aichholzer
Original assignee: Lenzing Plastics Gmbh
Priority date: 2005-10-05
Filing date: 2006-09-28
Publication date: 2007-04-12
Also published as: AT502539A1; RU2008117420A; EP1937472A1; CN101316700A; AT502539B1; JP2009509816A

Abstract

The invention relates to the use of a composite film (1), made up of several sheet materials (a, b, c) comprising at least a) a layer of plastic forming the exterior of the film made of light- and weather-resistant plastic, b) a support layer and c) a metal layer arranged between layer a) and layer c) and/or a metallised layer of plastic with water vapour resistant properties, wherein the support layer b) is a woven or non-woven glass material for application to an insulation material.

Description

composite film

The invention relates to the use of a composite film which is composed of a plurality of layered materials.

In particular, the invention relates to the use of a composite film, which is suitable for laminating or cladding of insulating materials, in particular of insulating materials for installation pipes, insulating materials for the sheathing of containers of various kinds, and insulating materials for coating panels.

Such insulation materials are currently dressed, for example, with aluminum or galvanized steel sheets with a thickness of about 0.6 to 1.00 mm. The disadvantage of these thick sheets is their inflexibility. Mechanical damage of the sheets, e.g. Dents, persist in the material in the long run. The material costs are relatively high, even in the processing of such materials, there are problems, in particular due to the high weight. Another disadvantage is that the sheets are always retrofitted, e.g. on the construction site, can be applied to the insulation material.

Also known is a jacket with rigid films of PVC; However, this is not weather-resistant. A likewise known casing with an aluminum foil shows the same disadvantage of a low weathering stability.

For the isolation of insulation materials, a composite film has also been made available which comprises as outer layer a film of polyethylene terephthalate (PET), an inner layer of polypropylene material (PP) and a film of aluminum located between the inner and outer layers. This composite film also has the disadvantage of low weathering stability.

The Austrian utility model AT 7931 U describes a composite film which is made up of a plurality of layered materials, containing at least

a) a layer forming the outside of the film of light-resistant and weather-resistant plastic, b) a main layer of thermoplastic material, and c) a layer with water vapor-blocking properties arranged between the layer a) and the layer b). The main or backing layer b) according to this document preferably consists essentially of polyvinyl chloride (PVC) rigid films.

From the documents EP 1 344 875 A2, DE 298 01 546 Ul, DE 19 27 377 U and DE 19 44 317 U, the use of various materials in the field of vapor barrier webs for roofs is described.

WO 2004/098879 A1 describes the use of a nonwoven composite element in automotive interior parts.

EP 0 167 956 A2 describes a composite lattice film and its use as packaging material.

DE 20 2005 007653 U describes an insulating element comprising a fiber mat and a metal foil formed as a lamination thereof.

From WO 97/22838 an absorber foil for thermal solar collectors is known.

The present invention has as its object to overcome the disadvantages of the prior art and to provide a material which is better suited for application to insulation materials in the outdoor area.

This object is achieved with the use of a composite film according to claims 1 to 14 for application to an insulating material.

It has been found that the composite film defined in claims 1 to 14 is outstandingly suitable for application to an insulating material, e.g. for laminating or cladding of insulating materials, in particular of insulating materials for installation pipes, insulation materials for the sheathing of containers of various kinds, and insulating materials for coating panels, is suitable.

It was surprisingly found that, in contrast to the composite film described, for example, in AT 7931 U, a glass cloth or a glass fleece is outstandingly suitable as carrier layer b).

Glass fabric or glass nonwovens have the great advantage over plastic materials previously used as support layer b) that they are virtually non-combustible and the resulting composite film thus has a lower flammability. Materials made of glass fabrics or glass nonwovens are also characterized by a high temperature stability; in the case of burning - in contrast to plastic materials - no or minimal generation of harmful gases can be observed.

In a preferred embodiment of the invention, the glass fabric or glass fleece has a weight per unit area of from 40 g / m ² to 600 g / m ² , preferably from 150 g / m ² to 250 g / m ² , more preferably around 200 g / m ² .

The thickness of the carrier layer b) may be 20 to 500 μm, preferably 100 to 300 μm, particularly preferably 200 μm.

The glass threads or glass fleece forming glass threads may have a yarn thickness of 11 to 2400 tex.

Particularly preferred as carrier layer b) a glass fabric is used which is constructed of glass threads of the type EC 9-68 (an E-glass according to DIN 1249 Part 1 with a yarn count of 68 tex).

The threads of the glass fabric are preferably interwoven in plain weave. The use of twill weave glass fabrics is also possible.

The glass fabric may be equipped with a conventional finishing, in particular a so-called "weave-lock-fmish".

The glass fabric or glass fleece used as backing layer b) may be colored. Preferably, the glass fabric or glass fleece used is white.

A particularly preferred embodiment of the present invention has as support layer b) a glass fabric of the type 7628 with a basis weight of about 200 g / m ² , a thickness of about 200 microns, consisting of glass threads of the type EC 9-68 in plain weave and equipped with a "weave lock" finishing.

The composite film used according to the invention, as is known from the Austrian Utility Model AT 7931 U, due to the combination of several layers numerous advantages: Due to the outer layer a) the film is resistant to Incidence of light and also weather-resistant. Thus, the outer layer a) also acts as corrosion protection for the layer c).

The layer a) is preferably a coating, paint or a film and may optionally be colored. In particular, layer a) may consist essentially of a material selected from the group consisting of silicone-based coatings, acrylic lacquers, nitrocellulose lacquers and films of UV-resistant polyethylene terephthalate and high-pressure polyethylene or mixtures thereof.

The layer c) serves as a water vapor barrier and thus as further protection for the insulating material, on which the composite foil is applied. The layer c) is preferably a metal layer and / or a metallized layer of plastic, in particular an aluminum foil or an aluminum layer applied by vapor deposition.

The layer b) gives the composite film in particular the necessary strength against mechanical influences.

In a preferred embodiment of the composite film used according to the invention, the thickness of the carrier layer b) is 40% to 95%, preferably at least 70%, particularly preferably at least 80% of the total thickness of the composite film. Thus, the required dimensional stability, especially against dents, stiffness, tear strength, puncture resistance and impact resistance can be ensured in a particularly good manner.

The thickness of the layer c) may preferably be 5 to 50 μm, particularly preferably up to 20 μm, in particular from 9 to 12 μm.

The thickness of the layer a) may preferably be 10 to 35 μm or 5 to 30 g / m ² .

The composite film preferably consists essentially of the layers a), b) and c). This is to be understood as meaning that apart from any necessary adhesive layers between the layers a), b) and c), the composite foil has no further material layers.

The total thickness of a composite film consisting of the layers a), b) and c) is preferably 50 microns to 800 microns. However, the composite film used according to the invention may also have further layers. Thus, for example, an additional sealing layer or insulating material below the layer b) may be applied a layer of adhesive, which is optionally provided with a peelable film in order to apply the composite film used in the invention to the insulating material can. Another possibility is to provide an aluminum layer below the layer b) on the insulating material side.

In a further preferred embodiment, the composite film used according to the invention contains at least one further layer e) of thermoplastic material, in particular consisting of a material selected from the group consisting of polypropylene, polyvinyl chloride, high-pressure polyethylene, polyethylene terephthalate and polystyrene or mixtures thereof.

From the Austrian Utility Model AT 7931 U is known to provide a layer of a thermoplastic material. A composite foil containing such a layer in combination with the use according to the invention of a layer of a glass fabric or a glass fleece has a good restoring force, whereby any e.g. in the assembly of the composite film or the insulating material resulting dents u.a. be compensated again.

The layer e) is preferably arranged between the layer b) and the layer c).

In particular, two layers c ') and c ") can be provided, between which the layer e) is arranged, the layer b) is then provided on the insulating material side below the second layer c").

The individual layers of the composite foil used according to the invention can be removed by means of conventional glue, e.g. Hotmelt glue to be joined together. Particularly suitable are polyurethane-based 2-component adhesives, which are equipped by the addition of additives UV, weather and water resistant. Thus, a delamination of individual layers can be prevented.

Likewise, the composite film used according to the invention can be produced, for example, by coating a prefabricated composite of the layers a) and c) with the carrier layer b). When applying the composite film used according to the invention to an insulating material or when applying an insulating material provided with the composite film according to the invention to a pipe, individual sections of the film or of the insulating material can be known per se, for example by overlapping the edge regions and gluing or welding the same to be connected with each other.

The composite film used according to the invention can already be applied to the insulation material on the factory side or can be retrofitted to the insulation material on-site.

In the following the invention is explained in more detail by figures and embodiments:

FIG. 1 shows schematically an embodiment of the composite film used according to the invention.

Figure 2 also shows schematically the embodiment according to Figure 1, in which the adhesive layers are shown.

FIG. 3 shows an embodiment with an additional plastic layer e).

FIG. 4 shows schematically the application of the composite film used according to the invention to an insulating material.

Example 1 :

Figure 1 shows schematically and greatly enlarged an embodiment of the composite film used in the invention, wherein a composite film 1, consisting essentially of the weather-resistant outer layer a, the support layer b and the water vapor barrier layer c, is shown.

In the representation according to FIG. 2, the adhesive layers d 'and d "are shown more clearly (greatly enlarged).

The outer layer a) consists of UV-resistant PET equipped with a thickness of 19 microns. The layer c) is an aluminum foil of 12 μm thickness. The layer b) is a glass fabric of type 7628 with a basis weight of about 200 g / m ^2, a thickness of ca. 200 μm, consisting of glass threads of the type EC 9-68 in plain weave and equipped with a "weave-lock" -finishing.

The layers are bonded together in a manner known per se with a polyurethane-based 2-component adhesive which is UV- or weather- and weather-resistant, glued (adhesive layers d 'and d ").

Example 2

FIG. 3 shows the structure of a further embodiment of the composite film used according to the invention, which has an additional layer e of thermoplastic material which is arranged between two aluminum foils c 'and c "(the adhesive layers are not shown in this figure).

In a preferred embodiment, the layer e has a thickness of 140 microns and consists of polyvinyl chloride, while the layer b) is a glass fabric according to Example 1 and has a thickness of about 200 microns. The two aluminum layers c 'and c "each have a thickness of 9 microns.

Example 3:

FIG. 4 schematically illustrates a possible application of the composite film 1 used according to the invention to an insulating material 3 which encases a pipe 2. The film 1 is placed around the insulating material 3. At the overlapping point of the film layers, the wrapping is closed, for example, by means of a rivet 4.

Claims

Claims:

1. Use of a composite film (1), which is composed of a plurality of layered materials (a, b, c), containing at least

a) a layer forming the outside of the film of light-resistant and weather-resistant plastic, b) a carrier layer and c) a metal layer arranged between the layer a) and the layer b) and / or a metallized layer of plastic with steam-inhibiting properties,

wherein the carrier layer b) is a glass fabric or a glass fleece, for application to an insulating material.

2. Use according to claim 1, characterized in that the glass fabric or glass fleece has a basis weight of 40 g / m ² to 600 g / m ² , preferably 150 g / m ² to 250 g / m ² , particularly preferably by 200 g / m ² has.

3. Use according to claim 1 or 2, characterized in that the thickness of the carrier layer b) is 20 to 500 .mu.m, preferably 100 to 300 .mu.m, particularly preferably by 200 microns.

4. Use according to one of the preceding claims, characterized in that the carrier layer b) a glass fabric is used, which is constructed of glass threads of the type EC 9-68.

5. Use according to one of the preceding claims, characterized in that as a carrier layer b) a glass fabric is used, the threads are woven together in plain weave.

6. Use according to one of the preceding claims, characterized in that as the carrier layer b) a glass fabric is used, which is equipped with a finishing, in particular a "weave-lock-fmish".

7. Use according to one of the preceding claims, characterized in that the layer a) is a coating, paint or a film.

8. Use according to one of the preceding claims, characterized in that the layer a) consists essentially of a material selected from the group consisting of coatings based on silicone, acrylic paints, nitrocellulose paints and films of UV-resistant treated polyethylene terephthalate and high density polyethylene or mixtures thereof ,

9. Use according to one of the preceding claims, characterized in that the layer c) is an aluminum foil or an applied by vapor deposition aluminum layer.

10. Use according to one of the preceding claims, characterized in that the thickness of the carrier layer b) is 40% to 95%, preferably at least 70%, particularly preferably at least 80% of the total thickness of the composite film.

11. Use according to one of the preceding claims, characterized in that the composite film consists essentially of the layers a), b) and c).

12. Use according to one of claims 1 to 10, characterized in that the composite film at least one further layer e) of thermoplastic material, in particular consisting of a material selected from the group consisting of polypropylene, polyvinyl chloride, high-pressure polyethylene, polyethylene terephthalate and polystyrene or Mixtures thereof, contains.

13. Use according to claim 12, characterized in that the layer e) between the layer b) and the layer c) is arranged.

14. Use according to claim 13, characterized in that two layers c ') and c ") are provided, between which the layer e) is arranged.

15. insulating material having on the outside a composite film according to one of claims 1 to 14.