Spacer profile having a reinforcement layer

A spacer profile for use as a spacer frame in an insulating window unit includes a profile body made of a synthetic material and having an inner wall, an outer wall and sidewalls, which define a chamber for hygroscopic material. A diffusion barrier layer is made of a first metal material and has a first tensile strength and a first thickness. The diffusion barrier layer is disposed at least on or in the outer wall and at least a portion of the sidewalls. A reinforcement layer is made of a second metallic material and has a second tensile strength and a second thickness. The reinforcement layer is formed in the inner wall or on the side of the inner wall, which is directed towards the chamber. The multiplication product of the second thickness and the second tensile strength is preferably greater than the multiplication product of the first thickness and the first tensile strength.

This application is the U.S. national stage of International Application No. PCT/EP2011/000312 filed on Jan. 25, 2011, which claims priority to German patent application no. 10 2010 006 127.1 filed on Jan. 29, 2010.

TECHNICAL FIELD

The present invention relates to a spacer profile for use in insulating window units having such a spacer profile.

RELATED ART

Insulating window units having at least two panes, which are held apart from each other in the insulating window unit, are known. Insulating panes are normally made from an inorganic or organic glass or from other materials such as Plexiglass. Normally, the separation of the window panes is secured by a spacer frame which is formed from at least one spacer profile. The spacer profile should exhibit a high thermal insulation. The spacer frame is preferably bent from one piece such that, after the bending, it can be closed by a connector at one position of the spacer frame.

The intervening space between the panes is preferably filled with an inert insulating gas, such as e.g., argon, krypton, xenon, etc. The filling gas should not be permitted to leak out of the intervening space between the panes. Moreover, it should also naturally not be possible for nitrogen, oxygen, water, etc., which are contained in the ambient air, to enter into the intervening space between the panes. For this reason, the spacer profile must prevent such a diffusion. Therefore, spacer profiles have a diffusion barrier layer which seals the intervening space between the panes from the surroundings. In so far as the term “impermeability” is utilized in the following description with respect to the spacer profile or materials forming the spacer profile, vapor impermeability as well as also gas impermeability for the gases relevant herein are meant.

Furthermore, the heat transmission of the edge bond, i.e. the bond of the frame of the insulating window unit, of the panes, and of the spacer frame, in particular plays a very important role for achieving low heat conduction in these insulating window units. Insulating window units, which ensure high terminal insulation along the edge bond, fulfill “warm edge”-conditions in accordance with the meaning of the term in the art.

WO 2006/027146 A1 shows a spacer profile for a spacer profile frame comprising a profile body made of synthetic material which has at least one chamber for accommodating hygroscopic material, and wherein a metal film encloses the profile body on three sides such that, in the assembled state of the spacer profile, the non-enclosed inner side of the profile body is directed towards the intervening space between the panes, and this not-enclosed inner side of the profile body comprises openings for moisture exchange between hygroscopic material accommodated in the chamber and the intervening space between the panes, and wherein the metal film has a profile with at least one angle or bend on the ends directed towards the intervening space.

Furthermore, a spacer in form of a hollow profile made of synthetic material and having at least one diffusion barrier layer is known from EP 0 601 488 A2, which at least one diffusion barrier layer is formed in the sidewalls and in the outer wall of the hollow profile. Further, the hollow profile has an insert in the inner wall of the hollow profile that faces towards the intervening space of the insulating window unit.

SUMMARY

It is an object of the present teachings to disclose a spacer profile for use as a spacer frame, which spacer profile is suitable to be mounted in and/or along an edge portion of an insulating window unit to form and maintain an intervening space between the window panes, and which spacer profile fulfills the “warm edge”-conditions, has the desired impermeability, and additionally enables a fast bending process.

The reinforcement layer can be designed so that it is thinner than the diffusion barrier layer, but it has an appropriately higher strength and/or an appropriately higher elastic modulus. Preferably, less heat is transferred through the comparatively thinner reinforcement layer.

The productivity of the bending process depends directly on the bending speed, i.e. the angular velocity, with which the profile is moved about the bending radius. For spacer profiles, the bending speed is limited to a maximum bending speed, which is due to the fact that, during the bending, lengthy profile portions are highly accelerated at longer distances from the bending radius and exceeding of the maximum bending speed results in unintended deformations.

By providing the additional reinforcement layer, a high quality result is achieved during the bending process, and additionally the maximum bending speed is considerably increased.

Further features and functionalities follow from the description of exemplary embodiments with the assistance of the Figures.

DETAILED DESCRIPTION OF THE INVENTION

Embodiments will be successively described with reference to the Figures. The same features/elements are denoted by the same reference symbols in all Figures. For the purpose of clarity, all reference symbols have not been inserted into all Figures. The coordinate system as shown inFIG. 1, betweenFIGS. 7 and 8, and betweenFIGS. 10 and 11is valid in all Figures, the description and the claims. The longitudinal direction corresponds to direction Z, the lateral direction corresponds to direction X, and the height direction corresponds to direction Y.

InFIGS. 1 and 3to12, by way of example, are respectively shown a so-called W-configuration of the spacer profile in a), and a so-called U-configuration of the spacer profile in b). Now, a spacer profile according to the first embodiment will be described with reference toFIGS. 1a) andb), and3a) andb).

FIG. 1shows in each of a) and b) a perspective cross-sectional view of the arrangement of window panes51,52in an insulating window unit having disposed therebetween a spacer profile in form of a spacer profile frame50, adhesive material61, and sealing material62.

The spacer profile is shown inFIGS. 3a) andb) in a cross-section perpendicular to the longitudinal direction, i.e. in a cross-section in the X-Y plane, and extends with this unvarying cross-section in the longitudinal direction Z. The spacer profile is comprised of a profile body10, which is made of synthetic material, and has a first height h1in the height direction Y and a first width b1in the lateral direction X. The synthetic material is an elastically-plastically deformable, poorly heat conducting material.

Here, the term “elastically-plastically deformable” means that elastic restoring forces are active in the material after a bending process, as it is typically the case for synthetic materials, but that a portion of the bend is effected by a plastic, not reversible deformation. Further, with respect to “poorly heat conducting” it should be understood here that the thermal conductivity value λ is ≦0.4 W/(m K).

The first material is preferably a synthetic material, preferably polyolefin, and more preferably polypropylene, polyethylene terephthalate, polyamide or polycarbonate, as for example acrylonitrile-butadiene-styrene-copolymerisate, Novolen 1040K® or PA66 GF25. The first material has preferably an elastic modulus E1≦3000 N/mm2and a thermal conductivity value λ less than or equal to 0.4 W/(m K), preferably less than or equal to 0.2 W/(m K).

The profile body10comprises an inner wall13and an outer wall14, which are spaced apart by a distance h2in the height direction Y and extend in the lateral direction X. The profile body10comprises two side walls11,12, which are spaced apart by a distance b2in the lateral direction X and extend basically in the height direction Y. The sidewalls11,12are connected by the inner wall13and the outer wall14such that a chamber20for accommodating hygroscopic material is formed, the chamber20being defined on the respective sides in cross-section by the walls11to14of the profile body10. The chamber has a second height h2in the height direction Y and a second width b2in the lateral direction X.

The sidewalls11,12serve as abutment bars for the inner sides of the panes51,52. The profile body10is adhered by the adhesive material61in a gas-tight manner to the inner side of the panes51,52via the side walls11,12. The inner wall13is, in the assembled state of the spacer profile, directed inwardly towards the intervening space53between the panes.

The profile body10is connected in a materially-bonded manner (for example, connected by fusion or by adhesive) with a one-piece diffusion barrier layer30, which is preferably formed as a diffusion barrier film. According to the first embodiment, the diffusion barrier layer30is formed on the outer sides of the outer wall14and side walls11,12, both of which outer sides face away from the chamber20. The diffusion barrier layer30extends along the side walls in the height direction Y up to the height h2of the chamber20.

The diffusion barrier layer30is made of a first metallic material having a second elastic modulus E2and a first tensile strength R1, and has a first thickness (material thickness) d1.

The first metallic material is preferably a plastically-deformable material. Here, the term “plastically deformable” means that practically no elastic forces are active after the deformation. This is typically the case, for example, when metals are bent beyond their elastic limit. The first metallic material is preferably stainless steel or a steel having an anti-corrosive coating made of tin (such as tinplate) or zinc, where appropriate, as necessary or as desired, having a coating of chrome or chromate.

The tensile strength [N/mm2] is a material property which is independent of the cross-sectional area or the like. It provides a force per unit area, at which the material fails (e.g., tears) when tension is applied. The elastic modulus [N/mm2] is a material characteristic value, which provides a correlation (relationship) between the tension and the elongation when a solid body is deformed.

For the materially-bonded connection of the profile body10and the diffusion barrier layer30, at least one side of the diffusion barrier layer30has to be connected to the profile body in a materially-bonded manner.

Here, the term “connected in a materially-bonded manner” means that the profile body10and the diffusion barrier layer30are permanently connected with each other, for example, by coextrusion of the profile body with the diffusion barrier layer30, and/or, if appropriate, by use of adhesives. Preferably, the strength of this materiallybonded connection is so large that the materials cannot be separated in the peeling test (for example, according to DIN 53282).

The preferred first metallic material for the diffusion barrier layer30is steel or stainless steel having a thermal conductivity value of λ≦about 50 W/(m K), preferably ≦about 25 W/(m K), and more preferably ≦about 15 W/(m K).

The first thickness (material thickness) d1of the diffusion barrier layer30is between 0.30 mm and 0.01 mm, preferably between 0.20 mm and 0.01 mm, more preferably between 0.10 mm and 0.01 mm, and still more preferably between 0.05 mm and 0.01 mm, for example, 0.02 mm, 0.03 mm, or 0.04 mm. Furthermore, it is conceivable that the diffusion barrier layer30is formed only as an applied metallic layer having three or less atom layers.

The maximum thickness can be selected in accordance with the desired thermal conductivity value. The thinner the film is, the better the “warm edge”-conditions are fulfilled. In the embodiments shown inFIG. 3a) andb), thicknesses in the range of 0.10 mm to 0.01 mm are preferred, and more preferred with using the above-mentioned metallic layer having more than three atom layers.

The first tensile strength R1for this metallic material is in the range of 470 N/mm2to 800 N/mm2, more preferably in the range of 630 N/mm2to 740 N/mm2, and is, for example, 500 N/mm2, 580 N/mm2, or 600 N/mm2.

The elongation at break of the first metallic material is preferably greater than or equal to about 15%, more preferably greater than or equal to about 20%.

An example for a stainless steel film is a steel film 1.4301 or 1.4016 according to DIN EN 1008812 having a thickness of 0.1 mm, and an example for a tin film is a film made of Antralyt E2, 8/2, 8T57 having a thickness of 0.125 mm.

In the W-configuration shown inFIG. 3a), the sidewalls11,12each have a concave portion with respect to the chamber20that forms the transition from the outer wall14to the corresponding sidewalls11,12. This design leads to an extension of the heat conduction path through the diffusion barrier layer30and, therefore, to an increase of the thermal insulation in comparison with the U-configuration shown inFIG. 4b), despite the same height h1and width b1of both configurations. In the W-configuration shown inFIG. 3a), the volume of the chamber20is slightly reduced in comparison to the U-configuration for the same width b1and height h1.

Further, in the inner wall13of the profile body10, a one-piece reinforcement layer40, which is preferably formed as a planar reinforcement layer or reinforcement plate, is connected to the profile body10in a materially-bonded manner. The reinforcement layer40is made of a second metallic material having a third elastic modulus E3and a second tensile strength R2, and has a second thickness (material thickness) d2.

The reinforcement layer40extends over a third width b3in the lateral direction X. The reinforcement layer40, which is integrated into the inner wall13in accordance with the first embodiment, is horizontally oriented in the X-direction, such that it is preferably centrally arranged. At the same time, the reinforcement layer40is disposed between two openings15, which are adjacently located in the lateral direction x and are disposed in the inner wall13close to the transitions of the inner wall13to the sidewalls11,12in the lateral direction X, such that the reinforcement layer40is arranged in a central position. In the height direction Y, the reinforcement layer40, which is integrated into the inner wall13, is oriented such that it is also preferably centrally positioned and, at the same time, is not visible through the upper synthetic material layer, which is directed towards the inner side of the intervening space between the panes. In this embodiment, the synthetic material layers arranged above and below the reinforcement layer40have the same material thicknesses as much as possible. The reinforcement layer40acts as a reinforcing element.

The second metallic material is preferably a plastically-deformable material. Preferably, the second metallic material is stainless steel or steel having an anti-corrosive coating made of tin (as tin plate) or zinc, if appropriate, having a coating of chrome or chromate.

The preferred material for the reinforcement layer40is steel or stainless steel having a thermal conductivity value of λ≦about 50 W/(m K), preferably ≦about 25 W/(m K), and more preferably ≦about 15 W/(m K).

The second thickness d2is between 0.30 mm and 0.01 mm, preferably between 0.30 mm and 0.05 mm, more preferably between 0.2 mm and 0.08 mm, and still more preferably between 0.20 mm and 0.10 mm, as for example, 0.10 mm, 0.15 mm, or 0.20 mm. In the embodiments shown inFIGS. 3a) andb), a second thickness d2in the range of 0.20 mm and 0.10 mm is preferred.

The second tensile strength R2for the reinforcement layer40is in the range of 800 N/mm2to 2000 N/mm2, preferably in the range of 800 N/mm2to 1800 N/mm2, more preferably in the range of 800 N/mm2to 1500 N/mm2, and is, for example, 1000 N/mm2, 1250 N/mm2or 1300 N/mm2.

The third elastic modulus is in the range of 199 kN/mm2to 240 kN/mm2, preferably in the range of about 199 kN/mm2to 210 kN/mm2, for example, it is 205 kN/mm2.

The elongation at break of the reinforcement layer40is preferably greater than or equal to about 17%, more preferably greater than or equal to about 25%, or equal to about 60%.

An example for a stainless steel film is a steel film 1.4034 or 1.4419 according to DIN EN 1008812 having a thickness of 0.1 mm.

An improved bending speed can be achieved, e.g., by complying with the following “product relationship” (multiplication relationship) between the reinforcement layer40and the diffusion barrier layer30. The product of the second tensile strength R2and the second thickness d2of the reinforcement layer40is greater than the product of the first tensile strength R1and the first thickness d1of the diffusion barrier layer30. Alternatively or additionally, the product of the third elastic modulus E3and the second thickness d2of the reinforcement layer40is greater than the product of the second elastic modulus E2and the first thickness d1of the diffusion barrier layer30. The corresponding products are selected independently of the width of the two layers30,40.

According to the first embodiment, for example, d1=d2=0.1 mm. In accordance with the above-set product relationship, it follows therefrom that the reinforcement layer40according to a third embodiment has a second tensile strength R2which is greater than the first tensile strength R1, for example, R2=1500 N/mm2and R1=630 N/mm2. The product of R2and d2is therefore greater than the product of R1and d1. It follows therefrom that the strength of the reinforcement layer40is greater than that of a layer having the same width made of the first metallic material of the diffusion barrier layer30.

Alternatively or additionally, the reinforcement layer40has a larger third elastic modulus E3than the second elastic modulus E2of the diffusion barrier layer30. For example, E3=210 kN/mm2and E2=195 kN/mm2. It follows therefrom that the product of E3and d2is greater than the product of E2and d1. Thus, the stiffness of the reinforcement layer40is greater than that of a layer having the same width made of the first metallic material of the diffusion barrier layer30.

The hygroscopic material, which is to be filled into the chamber20, must be in communication with the intervening space between the panes to order to be able to exhibit its effect. For this purpose, the openings15are provided in the inner wall13, the openings15are preferably arranged in direct proximity to the sidewalls11,12. The openings15are arranged such that they do not traverse the reinforcement layer40. Therefore, the inner wall13is intentionally not formed in an impermeable manner.

The non-impermeable design can additionally or alternatively be accomplished by the choice of the material for the entire profile body10and/or the inner wall13and the reinforcement layer40such that the material allows an appropriate diffusion even without the formation of the openings15. However, the formation of the openings15is preferred.

In the assembled state, a moisture exchange can be ensured between the intervening space53between the panes and the chamber20, which is filled with hygroscopic material, through the openings15(see alsoFIG. 1).

All details concerning the first embodiment also apply to all the other described embodiments, except when a difference is expressly noted or is shown in the Figures.

FIGS. 4a) andb) show a spacer profile according to a second embodiment in a W-configuration and a U-configuration.

The profile body10of the spacer profile corresponds to the profile body10of the first embodiment. The diffusion barrier layer30ahas a first tensile strength R1and a second elastic modulus E2.

In the second embodiment, the material of a reinforcement layer40apreferably corresponds to the material of the diffusion barrier layer30a. In particular, a second tensile strength R2of the reinforcement layer40ais equal to the first tensile strength R1of the diffusion barrier layer30a, and additionally or alternatively, a third elastic modulus E3is equal to the second elastic modulus E2.

The values for the first thickness (material thickness) d1aof the diffusion barrier layer30acorrespond in an exemplary manner to the values for the first thickness d1according to the first embodiment. However, the first thickness d1acan also preferably correspond to a value between 0.05 mm and 0.01 mm in accordance with the above-mentioned value range. A second thickness d2aof the reinforcement layer40ais, when complying with the above-set product relationship, larger (thicker) than the first thickness d1in the second embodiment. The second thickness d2ais in the above-mentioned value range of d2.

In the shown embodiment, a second thickness d2ain the range of 0.3 mm to 0.11 mm is preferred.

For example, according to the second embodiment, d1a=0.10 mm, R2=R1=800 N/mm2, and additionally or alternatively E3=E2=199 kN/mm2. According to the product relationship (d2a×R2)>(d1a×R1), a second thickness d2a>d1a, for example d2=0.2 mm, follows therefrom.

This in turn results in that the strength and/or stiffness of the reinforcement layer40ais greater than that of a layer having the same width made of the first metallic material of the diffusion barrier layer30a.

FIGS. 5a) tod) show a spacer according to a third embodiment in a W-configuration and a U-configuration. The profile body10of the spacer profile according to the third embodiment corresponds to the profile body10of the first embodiment.

According to the third embodiment, a second tensile strength R2of a reinforcement layer40bis greater than a first tensile strength R1of the diffusion barrier layer30b. Additionally or alternatively, a third elastic modulus E3of the reinforcement layer40bis greater than the second elastic modulus E2of the diffusion barrier layer30b.

The first thickness d1bcorresponds to the first embodiment. The second thickness d2bof the reinforcement layer40bis, in this embodiment, larger than the first thickness d1b.

When complying with the above-mentioned product relationship, the product of R2and d2bis greater than the product of R1and b1. Additionally or alternatively, it follows that the product of E3and d2bis greater than the product of E2and d1.

This, in turn, results in that the strength and/or stiffness of the reinforcement layer40bis greater than that of a layer having the same width made of the first metallic material of the diffusion barrier layer30b.

It is shown inFIGS. 5c) andd) that the reinforcement layer40bcan also be attached to the side of the inner wall13which is directed towards the chamber. InFIG. 5c), the reinforcement layer40bis attached to the inner wall13in such a manner that the thickness of the inner wall13is reduced by the corresponding thickness d2bof the reinforcement layer40bin the portion in which the reinforcement layer40bis attached to the inner wall13. That means, the reinforcement layer40bis embedded in the wall. InFIG. 5d), the reinforcement layer40bis attached to the inner wall13, for example, by an additional adhesive agent. The cross-section of the inner wall13of the profile body10does not change in the portion, in which the reinforcement layer40bis attached.

In all other embodiments, the reinforcement layer40bcan also be attached to the side of the inner wall13that is directed towards the chamber.

FIGS. 6a) andb) show a spacer according to a fourth embodiment in a W-configuration and a U-configuration. The profile body10of the spacer profile according to the fourth embodiment corresponds to the profile body10according to the first embodiment.

In this embodiment, a second thickness d2cis less than the first thickness d1c. When complying with the product relationship, the lesser second thickness d2chas to be compensated by a correspondingly larger second tensile strength R2. Additionally or alternatively, the smaller second thickness d2ccan be compensated by a correspondingly larger third elastic modulus E3.

A second tensile strength R2of the reinforcement layer40cis also greater than a first tensile strength R1of the diffusion barrier layer30c. Additionally or alternatively, a third elastic modulus E3of a reinforcement layer40cis greater than the second elastic modulus E2of the diffusion barrier layer30c.

It follows therefrom that, although d2c<d1c, the strength and/or stiffness of the reinforcement layer40cis greater than that of a layer having the same width made of the first metallic material of the diffusion barrier layer30c.

By making the second thickness d2cof the reinforcement layer40cless than the first thickness d1cof the diffusion barrier layer30c, the thermal conductivity through the reinforcement layer40cis decreased.

The combinations of different thicknesses d1, d2, tensile strengths R1, R2, and elastic modulus E2, E3, which are shown in the first four embodiments, can be freely combined with all of the further shown embodiments. The further features of the fourth embodiment, which are described in the following, can be understood as optional features.

The diffusion barrier layer30is formed on the outer sides of the outer wall14and of the sidewalls11,12that are directed away from the chamber20. The film30extends along the sidewalls in the height direction Y up to the height h2of the chamber20. Adjoined thereto, the one-piece diffusion barrier layer30comprises profiled extension portions31,32, each having a profile31a,32a.

In this context, the term “profile” means that the extension portion is not exclusively a linear extension of the diffusion barrier layer30, but rather that a two-dimensional profile is formed in the two-dimensional view of the cross-section in the X-Y-plane, which profile is formed, for example, by one or more bends and/or angles in the extension portion31,32.

In the embodiment shown inFIG. 6, the profile31a,32acomprises a bend (90°) and a portion (flange) connected thereto, which extends inwardly in the lateral direction X from the outer edge of the corresponding sidewall11,12over a length l1. In the embodiment shown inFIG. 6, the largest portion of the extension portion is completely enclosed by the material of the profile body.

Summarizing, it can be said that the extension portion should be located as close as possible to the inner wall. For this reason, the portion of the profile body (receiving portion), in which the extension portion is located (is received), preferably should be located clearly above the central line of the profile in the height direction. In such a case, the extension of the receiving portion from the inner side of the inner wall13of the spacer profile in the Y-direction should extend over not more than 40% of the height of the spacer profile. In other words, the receiving portion16,17has a height h3in the height direction, and the height h3should be less than or equal to about 0.4 h1, preferably less than or equal to about 0.3 h1, still more preferably less than or equal to about 0.2 h1, and still more preferably less than or equal to about 0.1 h1.

Furthermore, it is advantageous when the mass of the extension portion is at least about 10% of the mass of the remaining portion of the diffusion barrier layer30, which is located above the central line of the spacer profile in the height direction, preferably at least about 20%, more preferably about 50%, and still more preferably about at least 100%.

FIGS. 7 to 11show spacer profiles according to a fifth, sixth, seventh, and eighth embodiment which differ from the spacer profiles according to the fourth embodiment in that the design of the extension portions is different. The material of the diffusion barrier layer30in the spacer profiles shown inFIGS. 7 to 11corresponds to the material of the diffusion barrier layer30according to the fourth embodiment, but it can also be modified according to the first to the third embodiments.

In all embodiments shown inFIGS. 7 to 11, it is necessarily required that the product of the first thickness d1and the second elastic modulus E2and/or of the first thickness d1and the first tensile strength R1of the diffusion barrier layer30is less than the product of the second thickness d2cand the third elastic modulus E3and/or of the second thickness d2cand the second tensile strength R2of the reinforcement layer40c.

The fifth embodiment of a spacer, which is shown inFIGS. 7a) andb), differs from the fourth embodiment in that the lengths of the extension portions31,32are nearly twice as long as in the first embodiment, whereas the extension length l1remains unchanged. This is achieved by providing a second bend (180°) in the profiles31b,32b, and by extending the portion of the extension portion, which is connects to the second bend, again in the lateral direction X, but also outwardly. Thus, a significantly longer length of the extension portion is ensured, wherein the most possible proximity to the inside of the spacer profile is maintained.

Additionally, a portion of the material of the profile body is enclosed on three sides by the profiles31b,32b. This enclosure leads to the fact that the enclosed material functions, in a bending process with compression, as an essentially non-compressible volume element.

With reference toFIGS. 8a) andb), a spacer profile according to a sixth embodiment is described, wherein inFIGS. 8c) andd) the portions, which are encircled by a circle in a) or b), are shown in an enlarged manner. The sixth embodiment of the spacer differs from the fourth embodiment in that the diffusion barrier layer30, inclusive of the extension portions31,32, completely extends on the outer side of the profile body10. Thus, the extension portions31,32and their profiles31c,32care visible on the inner side (the “outer side” facing the intervening space between the panes) in the assembled state, because they are not covered by the material of the profile body on the inner side, but rather they are exposed. In this embodiment, the extension portion is disposed as close as possible to the inner side.

The embodiment shown inFIG. 8may be modified, for example, in that the extension portion31,32is extended and, similar to the embodiment as shown inFIG. 5(or also inFIGS. 7 to 9), continues inwardly into a receiving portion16,17.

InFIGS. 9a) andb), cross-sections of a spacer profile according to a seventh embodiment are shown. The seventh embodiment differs from the fourth embodiment in that the bend is not a 90°-bend but rather a 180°-bend, such that, in the profiles31d,32d, the portion of the extension portion connecting to the bend does not extend in the lateral direction X, but rather in the height direction Y. Instead, a three-sided enclosure of a portion of the material of the profile body in the receiving portions16,17is achieved, even though only one bend is provided, such that again, when bending the spacer profile with compression, an essentially non-compressibly-acting volume element is provided.

Furthermore, inFIGS. 10a) andb), cross-sectional views of a spacer profile according to an eighth embodiment are shown. The eighth embodiment differs from the fourth embodiment only in that the radius of curvature of the bend of the profiles31e,32eis smaller than in the seventh embodiment.

InFIGS. 11a) andb), cross-sectional views of a spacer profile according to a ninth embodiment are shown. The ninth embodiment differs from the fourth to eighth embodiments, which are shown inFIGS. 6 to 10, in that the profiles31f,32fare first bent inwardly by about 45°, then bent by about 45° in the opposite direction, and then bent by a 180° bend with the corresponding three-sided enclosure of a portion of the material of the profile body.

In case the profile or the extension portion has bended, angled and/or folded configurations according toFIGS. 6 to 11, the length (perpendicular to the longitudinal direction in the cross-section) of the profile or of the extension portion, and thus, the mass of the diffusion barrier layer, which has been additionally provided in this section or portion of the spacer profile, can be significantly increased. A displacement of the bending line (elastic line) occurs thereby, which, in turn, results in a reduction of the formation of wrinkles. Furthermore, the sag is remarkably reduced, because the bended, angled, and/or folded profile- and/or extension portion significantly contributes to the strength of the structural integrity of the bent spacer frame.

FIGS. 12a) andb) show a spacer profile according to a tenth embodiment in a W-configuration and a U-configuration.

The profile body10of the spacer profile according to the ninth embodiment corresponds to the profile body10of the second embodiment. The material of the diffusion barrier layer30corresponds, for example, to the material of the diffusion barrier layer30of the second embodiment and has, for example, the same first tensile strength R1and the same second elastic modulus E2.

The material of the reinforcement layer40dcorresponds, for example, to the material of the diffusion barrier layer30. Accordingly, the second tensile strength R2and/or the third elastic modulus E3of the material of a reinforcement layer40dis the same as the first tensile strength R1and/or the second elastic modulus E2of the diffusion barrier layer30.

For example, in accordance with the second embodiment, the first thickness (material thickness) d1of the diffusion barrier layer30is less than a second thickness d2dof the reinforcement layer40d.

The profile body10has additional openings15extending through the inner wall13and the reinforcement layer40d. The moisture exchange through the inner wall13can be improved thereby.

FIGS. 13a) andb) show a spacer profile according to an eleventh embodiment in a W-configuration and a U-configuration. The spacer profile according to the eleventh embodiment differs from the spacer profile according to the tenth embodiment in that a diffusion barrier layer30eis formed in the outer wall14and in the sidewalls11,12. It is advantageous when the diffusion barrier layer30eis disposed centrally in the outer wall14and when the walls of the profile body10uniformly enclose the diffusion barrier layer30e.

The features of the different embodiments can be freely combined with each other. The product of the second tensile strength R2and the second thickness d2, d2a, d2b, d2c, d2dis greater than the product of the first tensile strength R1and the first thickness d1, d1a, d1b, d1c, d1e. Alternatively or additionally, the product of the third elastic modulus E3and the second thickness d2, d2a, d2b, d2c, d2dis always greater than the product of the second elastic modulus E2and the first thickness d1, d1c, d1e.

For example, the reinforcement layer shown inFIGS. 12a) andb) may also have a second thickness d2dthat is smaller than the first thickness d1e.

The diffusion barrier layer can also be formed in one sidewall11,12and attached to the other sidewall11,12. Furthermore, the diffusion barrier layer can also be formed on or in the outer wall14and on or in the sidewalls11,12. The diffusion barrier layer can also be formed completely, or only partly, in or on the sidewalls11,12.

Additionally, further openings15for connecting the chamber20with the intervening space53between the panes51,52can be formed in the reinforcement layer40d.

The profile body10can also have the shape of a trapezoid, a square, a rhombus or any other shape. The convexity can also have different shapes, for example, being double convex or asymmetrical convex.

The reinforcement layer40can extend over the entire width b1, or only partly over the width b1. The reinforcement layer40can also be attached in an asymmetrical manner.

An insulating window unit having a spacer profile frame50is manufactured by the following steps. At first, the spacer profile according to one of the above embodiments is manufactured, for example, by extrusion. Subsequently, a spacer profile frame50is made from the spacer profile, as shown inFIG. 2, by appropriately bending the spacer profile. Here, particular attention has to be paid to a maximal bending speed. The ends of the spacer profile are joined by a connector. Subsequently, the sidewalls11,12of the spacer profile50are respectively adhered with an inner side of the panes51,52using an impermeable adhesive material. The remaining open space between the inner sides of the panes on the side of the spacer profile50, which face away from the intervening space53between the panes51,52, and the adhesive material61is filled with a mechanically-stabilizing sealing material62.

Furthermore, the spacer frame can also be joined into a spacer frame from a plurality of, preferably four, separate spacer profiles using corner connectors. To ensure an improved gas impermeability, the solution using the bending process is preferred.

The first and second thicknesses do not have to be constant, but instead can also be, for example, thicker at the edges than in the central portion.

The chamber may also be partitioned by partition walls into a plurality of chambers.

The first height h1in the height direction Y is between 10 mm and 5 mm, preferably between 8 mm and 6 mm, such as for example, 7 mm, 7.5 mm, and 8 mm.

The second height h2in the height direction Y is between 9 mm and 2 mm, preferably between 7 mm and 4 mm, such as for example, 4.5 mm, 5 mm, and 5.5 mm.

The first width b1in the lateral direction X is between 20 mm and 6 mm, preferably between 16 mm and 8 mm, such as for example, 8 mm, 10 mm, and 14 mm.

The second width b2in the lateral direction X is between 17 mm and 5 mm and preferably between 15 mm and 7 mm, such as for example, 7 mm, 9 mm, and 12.5 mm.

In a W-configuration, the chamber has, in the area of the concave portion, a width in the lateral direction X between 15 mm and 5 mm, such as for example, 10 mm.

In a W-configuration, the chamber has, in the area of the concave portions, a height in the vertical direction Y between 6 mm and 2.5 mm, such as for example, 3.5 mm.

The third width b3in the lateral direction X is between 20 mm and 4 mm, preferably between 15 mm and 7 mm, such as for example, 6 mm, 8 mm, and 11 mm.

The possible values for the thickness d2correspond to the possible values for the thicknesses d2a, d2b, d2c, and d2e.

It is explicitly stated that all features disclosed in the description and/or the claims are intended to be disclosed separately and independently from each other for the purpose of original disclosure as well as for the purpose of restricting the claimed invention, independent of the combinations of the features in the embodiments and/or the claims. It is explicitly stated that all value ranges or indications of groups of units disclose every possible intermediate value or sub-group of units for the purpose of original disclosure as well as for the purpose of restricting the claimed invention, in particular as limits of a range recitation.