DE20313884U1 - Window or door frame is made up of hollow metal profiles containing rigid polyurethane foam cores with mesh reinforcement - Google Patents

Abstract

Window or door frame is made up of hollow metal profiles (e, g) containing rigid polyurethane foam cores (j) with a mesh reinforcement.

Description

Joachim Kleiss

Poysdorfer Strasse 4

97337 Dettelbach 1.7.2003

Utility model application:

Title:

Thermally insulated construction profile made of polyurethane (PUR) with spatially separated metal core profiles or cover layers and internal fabric reinforcement, e.g. for windows and doors.

Description:

Construction profiles made of polyurethane integral rigid foam (PUR), as described in German patents no. 34 08 995 and 34 08 975, for example, require metal core profiles to achieve sufficient rigidity, generally aluminum hollow profiles, which are either designed in one piece as square tube profiles with molded legs or, in a further development, in two pieces in the form of spatially separated individual profiles as described in utility model no. 201 05 875.8 to achieve better thermal insulation values.

The cross-sections in the drawings on Appendix 1-3 show profiles of these, consisting of a frame (a), sash profile (b) with insulating glass (c) and glazing bead (d). The distance between the two core profiles at the points where they are closest together (ϳ σ - 03) is the main factor determining the thermal insulation value (U-value) of the profile. The distance cannot be increased arbitrarily because the unreinforced PUR material in between can only bear a limited load. The shear and bending forces that occur in practice between the inner (g) and outer (e) metal profile only allow a distance of around 30 - 40 mm in the above-mentioned utility model, for example, which leads to a U-value of around 1.2 W/m ² K. In addition, the necessary screw anchors in the PUR web between the aluminum shells can be subjected to significantly lower, and often insufficient, loads than when fastening in the metal core. The latter can be improved by using a higher material density; however, this has a negative effect on the insulation value and also leads to a cost disadvantage. In a known profile of a similar design, this screw problem is solved by webs formed on the metal shells, which protrude into the PUR core and in which the screws are anchored. The webs inevitably create a thermal bridge in the PUR core, which significantly reduces the thermal insulation value of the profile.

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The disadvantages described are now eliminated or greatly reduced according to the invention by reinforcing the PUR material between the two metal shells with inserts (k or n) made of high-strength and poorly heat-conducting fabric. This is primarily glass fiber fabric, but it can also consist of natural materials, plastics or carbon fibers. The fabric can consist of several layers of light mats or of so-called strong armor fabric; depending on the load, it can be used with meshes running parallel to the profile or diagonally. Mesh fabrics running diagonally to the length of the profile increase the transverse shear strength to a particularly high degree.

With this fabric reinforcement, profiles of the type described can be manufactured and used with a significantly increased distance (o) between the metal shells and thus a significantly better U-value. Distances of 100 mm and more are possible and an insulation value Uf of well under 1.0 W/m ² K is achieved.

As is well known, such profiles are manufactured in foaming tools of, for example, 6 m in length, consisting of a lower and upper part. The fabric reinforcement is positioned between the two metal shells of the core profile before the mold is closed and is then easily and completely enclosed by the PUR material that is then injected. To make handling easier, the fabric can be cut into strips and wrapped around the spacers (i) between the metal shells; or the slightly wider strips are clamped between the shells by elastic deformation and thus fixed.

The mesh size of the fabric is conveniently so fine that the fastening screws used can find sufficient hold in it.

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The attached drawings, Annexes 1 to 3, show the invention by way of example using a PUR profile of the type in the utility model application No. 201 05875.8. The letters have the following meaning here:

Attachment 1:

a = Frame profile with core profile shells shifted outwards on both sides so that they form the profile surface on the room side and on the outside.

b = wing profile with features as in a

c = Insulating glass pane in the sash as double or triple insulating glass with profile rubber sealing inside and outside

d = glazing bead to create the contact pressure on the pane e = core profile shell on the outside with dovetail-shaped anchoring bars towards the PUR foam, double-walled as so-called aluminum extruded profiles

f=Hollow chamber in the outer shell to accommodate corner angles during frame assembly with mitre joint.

g = like e, but on the room side;

In a variation of the drawn form, this shell can be provided with an additional C-shaped web, which extends over the area of the fitting groove of the profile and allows the fittings commonly found on aluminum windows to be inserted or clipped in.

h = like f, but in the room-side shell

i = clip connector with which the two metal shells are held in the desired position in the foaming tool, arranged point by point.

j = PUR integral rigid foam

1 = dovetail-shaped anchoring bar Appendix 2:

k = fabric reinforcement in the PUR web between the metal shells

&ogr; = distance between the core profiles as effective value for thermal insulation.

Annex 3:

m = core profile shell outside alternatively to e as roll-formed sheet metal profile.

η = fabric reinforcement alternative to k preformed from stronger so-called armor fabric

&ogr; = distance between the metal shells

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Claims (7)

1. Thermally insulated construction profile made of polyurethane (PUR) with spatially separated metal core profiles or cover layers, characterized in that the PUR web between the metal shells is reinforced with a high-strength, poorly heat-conducting fabric, which is firmly foamed during profile production 2. Construction profile according to claim 1, characterized in that the core profiles consist optionally of extruded aluminum or roll-formed sheet metal. 3. Construction profile according to claim 1-2, characterized in that the fabric consists of woven mats cut into strips with meshes with longitudinal and transverse threads or of unformed mats, so-called rovings. 4. Construction profile according to claims 1-3, characterized in that the fabric is laid with diagonal mesh threads in relation to the longitudinal axis of the profile. 5. Construction profile according to claims 1-4, characterized in that the fabric consists of preformed so-called armor fabric. 6. Construction profile according to claims 1-5, characterized in that the fabric material consists of glass fiber, natural fiber, plastic, carbon or mixtures. 7. Construction profile according to claims 1-6, characterized in that the fabric is used in the PUR web in one layer or in several layers and in a combination of the different qualities.