Patent Application
20130316184
The present invention relates to a spacer profile adapted to be used in an insulating glass unit comprising such a spacer profile and further to an insulating glass unit comprising such a spacer profile.
Insulating glass units having at least two panes 151, 152, which are held by a distance apart from each other in the insulating glass unit are well-known (see
The intervening space 153 between the panes is preferably filled with an inert insulating gas, e.g. such as argon, krypton, xenon, etc. Naturally, this filling gas should not be permitted to leak out of the intervening space 153 between the panes, also over a long period of time. Moreover, the ambient air or rather components thereof, as for example nitrogen, oxygen, water, etc., also should not be permitted to enter into the intervening space 153 between the panes. Therefore, the spacer profile 100 must be designed so as to prevent such a diffusion between the intervening space 153 of the panes and the ambient. Therefore, spacer profiles comprise a diffusion barrier 157, which prevents a diffusion of the filling gas from the intervening space 153 between the panes to the ambient through the spacer profile 100.
Furthermore, the heat transmission of the edge connection, i.e. the connection of the edge of the insulating glass unit, of the glass panes 151, 152, and of the spacer frame 150, in particular, plays a very large role for achieving low heat conduction of these insulating glass units. Insulating glass units, which ensure high heat insulating along the edge connection, fulfil “warm edge” conditions as this term is utilized in the art. Thus, spacer profiles 100 shall have high heat insulation or low heat conduction.
The spacer frame 150 is preferably bent from a one piece spacer profile 100. In order to close the frame 150, respective ends of the spacer profile 100 are connected by a connector. If the spacer frame 150 is made up of a plurality of pieces of spacer profiles 100, a plurality of connectors is necessary. With respect to manufacturing costs as well as to insulating characteristics, it is preferred to provide only one connection.
Bending of the frame 150 made of the spacer profile 100 is, for example, performed by cold bending (at a room temperature of approximately 20° C.). Thereby, there is a problem of wrinkle formation at the bends.
The spacer profile shall be bendable with a minimum of wrinkle formation and, at the same time, have a high stability or rather rigidity and flexural strength.
A spacer profile is known from EP 0 601 488 A2 (family member U.S. Pat. No. 5,460,862), wherein an additional reinforcement or rather stiffening support is embedded on the side of the profile that faces toward the intervening space between the panes in the assembled state.
Furthermore, spacers comprising a comparatively thin continuous reinforcement layer made of metal material on the profile body made of synthetic material are well known. Such spacers are loosing their diffusion resistance or rather impermeability when being bent about 90° and comprise comparatively thick profile walls made of synthetic material to avoid sagging.
Other spacer profiles are known from DE 697 34 014 T2 (family member U.S. Pat. No. 5,851,609) and WO 2006/025953 A1.
It is an object of the invention to provide an improved spacer profile having improved heat/thermal insulation while, at the same time, having a considerable strength and flexural strength and good wrinkle formation characteristics in a bending process. An insulating glass unit with such a spacer profile is an alternate object of the invention.
The objects are solved by a spacer profile according to claim 1 and an insulating glass unit according to claim 10 comprising such a spacer profile.
Further developments of the invention are given in the dependent claims.
The diffusion resistance (or rather impermeability) is provided by a diffusion barrier. The diffusion barrier is at least partly made of a synthetic material to which sheet silicate is added. The synthetic material with sheet silicate has a heat conductivity being substantially lower than that of the reinforcement (stiffening, strengthening) layers. A spacer profile comprising two separate reinforcement layers, which are connected in a central portion by a diffusion barrier portion made of synthetic material with sheet silicate, has, in comparison to a similar conventional spacer profile, a substantially lower heat conductivity while at the same time having a constant or unchanged diffusion resistance. Furthermore, at the same time, the spacer profile may have a higher rigidity/stiffness and strength than conventional spacer profiles. Furthermore, material for the reinforcement layers can be saved such that the manufacturing costs and weight can be lowered.
Further features and usabilities follow from the description of exemplary embodiments with consideration of the figures. The figures show in:
Subsequently, embodiments are described with reference to
In the following, a spacer profile 1 according to a first embodiment is described with reference to
The spacer profile 1 comprises a hollow profile body 10 made of a first synthetic material, the hollow profile body 10 extending with a constant or rather unchanged cross-section in the longitudinal direction Z, and having a first width b1 in the lateral direction X and a first height h1 in the height direction Y. In the height direction Y, the hollow profile body 10 has an inner wall 12 and, in the height direction oppositely to the inner wall 12, an outer wall 14. The outer boundaries or rather edges of the inner wall 12 and the outer wall 14 in the lateral direction X are respectively connected by a side wall 16, 18 extending basically in parallel to the height direction Y. The first side wall 16 is located on the opposite side to the second side wall 18 in the lateral direction X. The plane of symmetry L extends basically parallel to the side walls 16, 18 and is located centrally between the side walls 16, 18. A chamber 20 is formed or rather defined by the inner wall 12, the first side wall 16, the outer wall 14 and the second side wall 18, all of them being connected to each other. Accordingly, in a cross sectional view perpendicular to the longitudinal direction Z, a closed, basically quadrangular profile, basically shaped as a closed “O” and defining the chamber 20 therein, is provided by the above walls. “Closed” does not necessarily mean that no openings are provided in one or more of the walls.
The first side wall 16, the second side wall 18 and the outer wall 14 respectively have a first wall thickness s1. The inner wall 12 has a second wall thickness s2.
Transitions or rather connecting portions of the side walls 16, 18 to the outer wall 14 are respectively round shaped in the first embodiment, here basically in form of a quadrant. Accordingly, a U-form/profile (U-configuration) is provided or rather formed by the two side walls 16, 18 and the outer wall 14, on which the inner wall 12 is placed as a cover. Therefore, the transitions or rather connection portions between the side walls 16, 18 and the inner wall 12, if seen in a cross-sectional view perpendicular to the longitudinal direction Z, basically have a rectangular shape with rounded connection portions on the side facing the chamber 20. The hollow profile body 10 forming the chamber 20 is preferably integrally formed by an extrusion process.
In this embodiment, the outer wall 14 is formed slightly concave with respect to the chamber 20. That means, the outer wall 14 is curved or rather corrugated or bulged in the height direction Y towards the inner space of the chamber 20 to form a curvature or rather convexity or bulge 21. The outer wall 14 is curved inwardly by a second height h2 towards the chamber 20 in the middle with respect to its edges in the lateral direction X, which means in an area of the plane of symmetry L.
In this embodiment, also the inner wall 12 is formed slightly concave with respect to the chamber 20. That means, the inner wall 20 is curved towards the inner space of the chamber 20 in the height direction Y to form a curvature 121. The inner wall 12 is, centrally with respect to its edges in the lateral direction X, which means in an area of the plane of symmetry L, curved by a third height h3 inwardly towards of the chamber 20.
Preferably, the curvatures 21, 121 are already formed in the extrusion process in the synthetic material. However, the curvatures 21 may also be formed directly after the extrusion or rather in a subsequent roll forming process.
Two reinforcement layers 22, 24 are extending directly on the hollow profile body 10 on a main portion of the outer surfaces of the side walls 16, 18 facing away from the chamber 20 and on a portion of the outer surface of the outer wall 14 facing away from the chamber 20, respectively. The first reinforcement layer 22 extends in one piece and continuously in the longitudinal direction Z with a constant cross-section directly on the outer surface (facing away from the chamber 20) of the first side wall 16 from just under the inner wall 12 to and directly on a portion of the outer surface (facing away from the chamber 20) of the outer wall 14 facing the first side wall 16. A second reinforcement layer 24 extends in one piece and continuously in the longitudinal direction Z with a constant cross-section directly on the outer surface (facing away from the chamber) of the second side wall 18 from just under the inner wall 12 to and directly on a portion of the outer surface (facing away from the chamber 20) of the outer wall 14 facing the second side wall 18. That means, the first reinforcement layer 22 extends basically on the “left” side of the outer wall 14 as shown in
As far as the term “diffusion resistance”, or rather “diffusion resistant” (or (diffusion) impermeability, diffusion proof etc.) are utilized with respect to the spacer profile or materials forming the spacer profile, vapour diffusion impermeability as well as also gas diffusion impermeability for the gases relevant herein (for example nitrogen, oxygen, water, etc.) are meant to be encompassed within the meaning thereof. The utilized materials are considered to be gas or vapour diffusion resistant or rather impermeable, if not more than 1% of the gases in the intervening space 153 between the panes can leak out within the period of one year. Furthermore, diffusion resistant is also equated to a low permeability in the sense of that the corresponding test norm EN 1279 part 2+3 is fulfilled. That means, the finished spacer profile or insulating glass unit (or insulating window unit) having such a spacer profile has to fulfil the test norm EN 1279 part 2+3.
The first and second reinforcement layers 22, 24 do not contact with each other. The reinforcement layers 22, 24 are formed and arranged such that they are spaced (apart) by a first distance al with respect to the lateral direction X. That means, a central portion 25 located centrally with respect to the lateral direction X is provided between the reinforcement layers 22, 24, wherein in or rather on the central portion 25 no reinforcement layers 22, 24 are provided. The central portion 25 extends over the first distance al in the lateral direction X and in the longitudinal direction Z.
In this embodiment, the reinforcement layers 22, 24 extend symmetrically with respect to the plane of symmetry L such that the first reinforcement layer 22 and the second reinforcement layer 24 are arranged on the outer wall 14 spaced with a distance a1/2 to the plane of symmetry L, respectively. The reinforcement layers 22, 24 are directly materially connected to the respective walls. That means, in this embodiment, the hollow profile body 10 and the reinforcement layers 22, 24 are coupled permanently by, for example, co-extruding the hollow profile body 10 together with the reinforcement layers 22, 24 and/or, where appropriate, by utilizing an adhesion promoter, and no further layers are formed between the reinforcement layers 22, 24 and the hollow profile body 10.
The first reinforcement layer 22 has a first constant thickness d1. The second reinforcement layer 24 has a second constant thickness d2. The first thickness d1 and the second thickness d2 are the same, in the present embodiment. As the reinforcement layers 22, 24 are formed on the outer surface (or rather side) of the outer wall 14, respectively, the height of the spacer profile 1 in the height direction Y consists basically of the first height h1 of the hollow profile body 10 and the amount of the first or second thickness (d1 or rather d2), such that the spacer profile 1 has an entire height (h4=h1+d1), in this embodiment. The width of the spacer profile 1 corresponds to the first width b1 of the hollow profile body 10, because the hollow profile body 10 is formed at the boundaries or edges in the lateral direction X such that the reinforcement layers 22, 24 do not increase the first width b1, in this embodiment. That means, the portion of the side walls 16, 18, on which no reinforcement layers 22, 24 are provided, are correspondingly thicker or rather broader than the portions of the side walls 16, 18, on which the reinforcement layers 22, 24 are provided. Accordingly, the reinforcement layers 22, 24 are, at least partly embedded in the side walls 16, 18 or the edges of the inner wall 12 in the lateral direction X.
The reinforcement layers 22, 24 comprise profiled extension (or rather elongation) portions 26 on their end portions in the height direction Y opposite to the outer wall 14, the extension portions 26 extending in the longitudinal direction Z. The extension portions elongate or rather prolongate or extend the reinforcement layers 22, 24 in the height direction Y from just under the inner wall 12. In this context, the term “profiled” means that the extension portion 26 is not exclusively a linear extension or elongation of the respective reinforcement layer 22, 24 in the height direction Y but instead 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 or rather curves or angles 28 of the extension portion 26.
In this embodiment, the extension portions 26 have a 90° curve/bend 28 toward the plane of symmetry L into the inner wall 12 at the height of the inner wall 12, respectively. That means, the extension portions 26 extend into the inner wall 12. The extension portions 26 further comprise a groove 30, as it can be seen in the two-dimensional view of the cross-section in the X-Y plane. The extension portion 26 extends with a first length 11 in the lateral direction X from the outer side of the respective side walls 16, 18 of the hollow profile body 10 into the inner wall 12.
By the extension portions 26, an improved bending characteristic and an improved adhesion or bonding of the reinforcement layers 22, 24 on or rather in the hollow profile body 10 is provided. It is preferred that the extension portions 26 are located as close as possible to the outer side of the inner wall 12 facing away from the chamber 20 (as close as possible to the intervening space 53 between the panes) but still being covered by material of the inner wall 12. The extension portions 26 are respectively accommodated in accommodation or retaining portions 32. Each accommodation portion 32 is formed by the inner wall 12 and/or the corresponding side wall 16, 18 and extends from the outer side/surface of the inner wall 12 in the same and, if applicable, in the corresponding side wall 16, 18 over a height in the height direction Y being less than 0.4 h1, preferably less than 0.2 h1 and more preferably less than 0.1 h1. The above mentioned height of the accommodation portions 32 further defines the beginning of the extension portions 26. The accommodation portions 32 have at least the wall thickness s1 of the side walls 16, 18 in the lateral direction X. Preferably, the accommodation portions 32 extend from the outer surfaces of the side walls 16, 18 facing away from the chamber 20 over a width <1.5 l1, preferably over a width <1.2 l1, and more preferred over a width of 1.1 l1 in the lateral direction X, respectively.
The mass (weight) of the respective extension portion 26 comprises preferably at least 10% of the mass (weight) of the remaining part of the respective reinforcement layer 22, 24, which is above the middle line of the spacer profile 1 in the height direction Y, preferably at least about 20%, more preferably at least about 50%, and still more preferably about 100%.
The outer wall 14 is formed by a second synthetic or plastic material to which sheet silicate is added, at least in the portion having no reinforcement layer 22, 24 attached thereon, that means in the central portion 25 located centrally with respect to the lateral direction X and extending over the first distance al in the lateral direction X. As it will be explained in detail below, the second synthetic material to which sheet silicate is added (“synthetic material with sheet silicate”) constitutes a diffusion barrier portion 34 being diffusion resistant or rather impermeable with respect to the chamber 20 and the outer side of the outer wall 14 facing away from the chamber 20. Thus, the diffusion barrier portion 34 is diffusion resistant or rather diffusion impermeable, at least in a direction perpendicular to the outer wall 14. The diffusion barrier portion 34 made of the second synthetic material with sheet silicate has a third specific heat conductivity λ3 and a third thickness d3 in the height direction Y. In this embodiment, the third thickness d3 equals the first wall thickness s1 of the outer wall 14 because the entire outer wall 14 is made of the synthetic material with sheet silicate in the central portion 25.
In this embodiment, the diffusion barrier portion 34 is connected to the first reinforcement layer 22 and the second reinforcement layer 24 in a diffusion resistant manner to constitute or rather form a continuous diffusion barrier 36. In this embodiment, the diffusion barrier portion 34 extends centrally between the side walls 16, 18 in the lateral direction X with a second width b2 being larger than the first distance a1 between the reinforcement layers 22, 24. That means, the boundary or rather edge of the first reinforcement layer 22 facing the second reinforcement layer 24 overlaps over a third width b3 in the lateral direction X with the boundary or edge of the diffusion barrier portion 34 facing the first reinforcement layer 22. In almost the same manner, the boundary of the second reinforcement layer 24 facing the first reinforcement layer 22 overlaps over the third width b3 in the lateral direction X with the boundary of the diffusion barrier portion 34 facing the second reinforcement layer 24. Accordingly, it is ensured that the reinforcement layers 22, 24 (and its edges on the outer wall 14) are connected to the diffusion barrier portion 34 in a diffusion resistant manner, respectively.
The diffusion barrier portion 34 serves to connect the first reinforcement layer 22 with the second reinforcement layer 24 in a diffusion resistant manner. At the same time, the diffusion barrier portion 34 serves to thermically insulate the first reinforcement layer 22 from the second reinforcement layer 24. The heat conduction through the diffusion barrier portion 34 is lower than through the reinforcement layers 22, 24. The heat conduction, that means the heat conductivity, is dependent on the geometry and the specific heat conductivity of the component/element. The diffusion barrier portion 34 is preferably formed or rather designed such that the (mathematical) product of the third thickness d3 and the third specific heat conductivity λ3 of the diffusion barrier portion 34 is smaller than the product of the first thickness d1 with the first specific heat conductivity λ1 of the first reinforcement layer 22 as well as smaller than the product of the second thickness d2 and the second specific heat conductivity λ2 of the second reinforcement layer 24. This requirement does not exclude that the third specific heat conductivity λ3 or the third thickness d3 may be larger than the corresponding parameter of the reinforcement layers 22, 24.
Accordingly, the spacer profile 1 comprises a diffusion resistant and, at the same time, insulating diffusion barrier 36, the diffusion barrier 36 being constituted or rather formed by the first reinforcement layer 22, the diffusion barrier portion 34, and in the second reinforcement layer 24, and extending from the first side wall 16 over the outer wall 14 to the second side wall 18. Therefore, in an assembled state of the spacer profile 1, the intervening space 53 between the panes can be diffusion impermeably bounded or rather defined by the spacer profile 1.
The sheet silicate is provided in the synthetic material in form of sheet silicate lamellas or rather laminas 38. Each of the sheet silicate lamellas 38 is diffusion resistant or rather diffusion impermeable. The sheet silicate lamellas 38 are embedded in the synthetic material of the diffusion barrier portion 34. The sheet silicate lamellas 38 are aligned or rather oriented such that the flat side of each sheet silicate lamella 38 is arranged basically parallel to the outer wall 14. Thereby, the sheet silicate lamellas 38 are basically (at least statistically) distributed in the diffusion barrier portion 34 uniformly in the height direction Y, in the lateral direction X, and in the longitudinal direction Z.
Liquids or gases or rather their atoms or molecules diffuse with specific (diffusion) speeds through synthetic materials. Therefore, when forming the diffusion barrier portion out of a conventional synthetic material without sheet silicate, as it is used, for example, in the present embodiment, for the side walls 16, 18, a specific number of atoms/molecules can diffuse per unit time per wall surface area. By providing sheet silicate lamellas 38 and by orienting or rather aligning the sheet silicate lamellas 38 in the synthetic material parallel to the outer wall 14, the atoms/molecules cannot diffuse through the diffusion barrier portion 34 on a straight line perpendicular to the outer wall, e.g. not on a direct way. In fact, the atoms/molecules are constrained or rather have to circle the respective sheet silicate lamellas 38 arranged perpendicular to the direct way through the outer wall 14. Therefore, the distance which has to be travelled by the atoms/molecules for passing through the diffusion barrier portion 34 in the height direction Y is substantially elongated. Due to the substantially longer travel distance, substantially less molecules per unit time are diffusing through the diffusion barrier portion 34 made of synthetic material with sheet silicate. Thus, the above-defined diffusion resistance or rather diffusion impermeability is achieved.
Each of the sheet silicate lamellas 38 has a fourth width b4 in the lateral direction X, a fourth thickness d4 in the height direction Y, and a second length l2 in the longitudinal direction Z. Each sheet silicate lamella 38 is spaced by a second distance a2 in the lateral direction X, a third distance a3 in the height direction Y, and a fourth distance a4 in the longitudinal direction Z to the adjacent sheet silicate lamella 38, respectively. The sheet silicate lamellas 38 are arranged in different sheet planes (or rather sheet layers or layer planes or layer levels) 40 being parallel to the X-Z plane. That means, a plurality of planes (sheet planes 40) of sheet silicate lamellas 38 are laying upon another in the height direction Y. The sheet silicate lamellas 38 in each sheet plane 40 are offset in the lateral direction X to the sheet silicate lamellas 38 in the respective adjacent sheet planes 40, respectively. Preferably, the sheet silicate lamellas 38 of adjacent sheet planes 40 are offset by (a2)/2+(b4)/2 in the lateral direction X, respectively. That means, the displacement (offset) is preferably selected such that when projecting the second distance a2 between two sheet silicate lamellas 38 onto a sheet silicate lamella 38 in an adjacent sheet plane 40, the projection of second distance a2 is arranged centrally on the sheet silicate lamella 38 in the adjacent sheet plane 40, respectively.
Because of the parallel but offset arrangement of the sheet planes, as described above, the molecules cannot “migrate” or rather diffuse straight or rather on the direct way in the height direction Y through the diffusion barrier portion 34. The atoms/molecules moving in the height direction Y through the diffusion barrier portion 34 have to traverse the diffusion barrier portion 34 mazelike or rather in form of a labyrinth. When the atoms/molecules have passed two sheet silicate lamellas 38 in one plane (through the space having the second distance a2 between two adjacent sheet silicate lamellas 38 in one sheet plane 40), each atom/molecule has further to travel a distance (for example (b4)/2) in the lateral direction X before being able to pass through the next two adjacent sheet silicate lamellas 38 in the proximate adjacent sheet plane 40 in the height direction Y. With other words, the atoms/molecules diffusing in the height direction Y through the diffusion barrier portion 34 have to travel through the synthetic material of the diffusion barrier portion 34 for permeating the diffusion barrier portion 34 on a way substantially longer than the direct way with the length of the third thickness d3. The diffusion resistance according to the above-stated definition is achieved by the elongated travel distance and, thus, elongated time required for an atom/molecule for traversing or rather diffusing through the diffusion barrier portion 34.
Due to the overlapping of the reinforcement layers 22, 24 with the diffusion barrier portion 34 in the lateral direction X, it is ensured that the atoms/molecules cannot diffuse through the spacer profile 1 without the desired elongation of the travel through distance. The atoms/molecules may diffuse through the outer wall in the portion, in which no sheet silicate is provided, but afterwards, due to the diffusion resistant reinforcement layers 22, 24, they have to diffuse or travel through the diffusion barrier portion 34 at least over the third thickness b3 in the lateral direction X. The travel distance in the lateral direction X is also elongated, because the sheet silicate lamellas 38 are arranged only basically parallel to the outer wall 14.
As shown in
Openings 44 are formed in the inner wall 13 such that the inner wall 13 is not diffusion resistant, independently of the selected materials for the hollow profile body 10. Thus, in an assembled state, a gas exchange, in particular also a moisture or vapour exchange, between the intervening space 53 of the panes and the chamber 20 filled with hygroscopic material is ensured.
The inner wall 12 is denoted as inner wall because it is directed inwardly to the intervening space 53 between the panes in the assembled state of the spacer profile 1 (see
The spacer profile 1 is preferably bended to a one piece spacer frame 50 (see
The reinforcement layers 22, 24 and the diffusion barrier portion 34, and, in particular, their thicknesses d1, d2, d3 are designed such that the spacer profile 10 does not rip up or burst in the above bending process of the spacer profile 10. Therefore, the diffusion barrier 36 made of the first reinforcement layer 22, the diffusion barrier portion 34 and the second reinforcement layer 24 remains diffusion resistant also after the bending process.
When bending the spacer profile 1, the inner wall 12 is normally compressed or rather shortened. The outer wall 14 is stretched. A neutral zone is provided between the inner wall 12 and the outer wall 14, the material of the body in the neutral zone being neither stretched nor compressed. The neutral zone is also referred to as “neutral fibre” of a body.
In this embodiment, the curved or rather bulged design of the outer wall 14 ensures that, in the guided bending process of the spacer profile 1, the outer wall 14 “retracts” or rather “folds” inwardly (see
In order to avoid tearing or rather breaking of the diffusion barrier portion 34 due to an outstanding strong elongation or rather extension in the process of bending, the central portion 25 or rather the diffusion barrier portion 34 extending over the first distance a1 (portion of the outer wall 14, on which no reinforcement layer 22, 24 is provided) or rather the second distance b2 in the lateral direction X, the curvature 21 of the outer wall 14, that means the second height h2, the first and second wall thickness d1, d2 of the reinforcement layers 22, 24, the wall thicknesses s1, s2 of the chamber 20, and the notches 32 may be formed or designed such that the diffusion barrier portion 34 is arranged adjacent to or on the “neutral fibre” of the spacer profile 1 while or when performing the bending process up to 90° around the bending axes parallel to the lateral direction X. In this case, the diffusion barrier portion 34 is less stressed because no extension or compression occurs in the neutral fibre itself and the bending stress therein is nearly zero.
The curved design of the inner wall 12 also allows an “easy” retraction. The inner wall 12 is mainly compressed. Alternatively or additionally, wrinkle formation may occur such that the length is shortened correspondingly. The extension portions 26 reduce the wrinkle formation at the boundaries in the lateral direction X.
The first metal material of the first reinforcement layer is preferably a plastic deformable material. The term “plastic deformable” means that elastic restoring forces are nearly zero after the deformation. This is typically the case, for example, when metals are bent beyond their elastic limit (apparent yield limit). The preferred first metal material for the first reinforcement layer 22 is steel or stainless steel having a first specific heat conductivity in the range of 10W/(mK)≦λ1≦50W/(mK), preferably in a range between 10W/(mK)≦λ1≦25W/(mK) and more preferably in a range between 10W/(mK)≦λ1≦17W/(mK). The E-modulus of the material is preferably in a range between 170 kN/mm2 to 240 kN/mm2, preferably about 210 kN/mm2. The percent elongation of failure of the material is preferably ≧15%, more preferably ≧20%, and still more preferably ≧30% and still more preferably ≧40%. The metal material may have a corrosion protection of tin (such as tin plating) or zinc, if applicable, necessary or desired, with a chrome coating or chromate coating. The second metal material of the second reinforcement layer 24 preferably corresponds to the first metal material but the second material may also be different to the first metal material, in particular, if the design and thicknesses of the two reinforcement layers 22, 24 are different to each other. An exemplary material for the reinforcement layers 22, 24 is a stainless steel film having a thickness d1, d2 of 0.1 mm.
The first synthetic material for parts of the hollow profile body 10, in which no sheet silicate is provided, is preferably an elastic-plastic deformable, poor heat conducting (and, therefore, insulating) material.
Herein, the term “elastic-plastic deformable” preferably means that elastic restoring forces are active in the material after a bending process, as it is typically the case for synthetic materials. Further, the term “poor heat conducting” preferably means that the heat conductivity (heat conduction value) λ is less than or equal to about 0.5 W/(mK), preferably less than or equal to 0.3 W/(mK).
The first synthetic material may be a polyolefin, preferably a polypropylene, or a polyethylene terephthalate, polyamide or polycarbonate, ABS, SAN, PCABS, PVC. An example for such a polypropylene material is Novolen 1040®. The material has an E-modulus preferably being less than or equal to about 2200 N/mm2 and a preferred specific heat conductivity λ≦0.3 W/(mK), more preferably ≦0.2 W/(mK).
The diffusion barrier portion 34 is made of a second synthetic material with sheet silicate. The second synthetic material is likewise an elastic plastic deformable, poor heat conducting (insulating) material. To produce the second synthetic material with sheet silicate, sheet silicate is added to a synthetic basic material. The synthetic basic material, that means the material to which sheet silicate is added, may be made out of one or a mixture of the materials that are mentioned with respect to the first synthetic material. Preferably, polypropylene is used. In this embodiment, the basic material corresponds to the first synthetic material.
After providing sheet silicate lamellas 38 in the above-mentioned synthetic basic material, the “second synthetic material with sheet silicate” (consisting of the synthetic basic material and sheet silicate) has a third specific heat conductivity λ3 being preferably lower than or equal to 0.5 W/(mK), more preferably lower than 0.4 W/(mK), and still more preferably lower than 0.3 W/(mK).
The surface of each sheet silicate lamella 38 has preferably an average value of 0.2 μm2 to 50 μm2, preferably 1 μm2 to 50 μm2 and more preferably 5 μm2 to 50 μm2.
The loading or rather weighting agent of the sheet silicate in the synthetic basic material is between 2% to 50%, preferably between 5% to 30%, and more preferably between 5% and 10%. The sheet silicate lamellas 38 are preferably basically glass silicates. However, also other sheet silicate lamellas may be used.
For manufacturing the spacer profile 1, more than one extruder is used, preferably. In the manufacturing process, the material for the parts or rather components of the hollow profile body 10 not constituting the diffusion barrier portion 34 are formed by a first extruder, and the material for the parts or rather components of the hollow profile body 10 being the diffusion barrier portion 34 are formed by a second extruder.
The raw material for the sheet silicate lamellas 38 consists of staples of individual or separate sheet silicate lamellas (sheet silicate laminas) 38. The staples of sheet silicate lamellas 38 are added to the synthetic basic material of the second synthetic material with sheet silicate in a known manner before filling the second synthetic material with sheet silicate into the second extruder or, alternatively, the sheet silicate lamellas 38 are added to the second synthetic basic material in the second extruder itself The sheet silicate lamellas 38 are most likely oriented erratically after the admixture.
Accordingly, in a further step, the sheet silicate lamellas 38 in the synthetic material with sheet silicate have to be oriented or aligned such that they are oriented basically in parallel to each other and the outer wall 14, as stated above. For this purpose, a laminar flow is generated at a narrow portion upstream of the extruder die by which the diffusion barrier portion 34 is extruded. The narrow portion is preferably designed in form of a slit. Due to the slit, the synthetic material—sheet silicate—mixture is accelerated. Due to the acceleration before and at the narrow portion (slit) and due to the laminar flow in the narrow portion, the sheet silicate lamellas 38 are oriented or aligned parallel to the slit.
The extruded synthetic profile parts or components with and without sheet silicate are preferably connected before they completely cure or rather solidify such that an integral hollow profile body 10 is formed wherein the sheet silicate lamellas 38 in the diffusion barrier portion 34 are arranged parallel to the outer wall 14.
Furthermore, preferably the first and second reinforcement layers 22, 24 are co-extruded together with the hollow profile body 10. In this case, after the extrusion process, the first and second reinforcement layers 22, 24 are materially and directly connected with the hollow profile body, and thus, also with the diffusion barrier portion 34. After applying the reinforcement layers 22, 24, the first reinforcement layer 22, the diffusion barrier portion 34 and the second reinforcement layer 24 constitute a continuous diffusion barrier 36.
After the extrusion process of the spacer profile 1, the spacer profile 1 is bent in accordance with the form of the desired spacer frame 50, as exemplarily illustrated in
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.
In this embodiment, the diffusion barrier 36 is made of a diffusion barrier portion 34, only. Each sheet silicate lamella 38 in the side walls 16, 18 and in the inner wall 12 is preferably oriented basically parallel to the outer wall but may alternatively be oriented basically parallel to the respective wall in which the sheet silicate lamella 38 is arranged. In the concave connection portion 46, the sheet silicate lamellas 38 are formed parallel to the concave connection portions, respectively.
Only one extruder is required for manufacturing the spacer profile 1 according to the second embodiment.
In order to further allow a gas exchange between the chamber filled with hygroscopic material and the intervening space 58 between the panes, also in this embodiment, the inner wall 12 preferably comprises openings 44. Therefore, the diffusion resistance is provided or rather ensured by the sidewalls 16, 18 and the outer wall 14, only.
The concave connection portion 46 extends the “heat conducting path” between the side walls 16, 18 over the outer wall 14, while at the same time, the first width b1 and the first height h1 of the spacer profile 1 are not changed. Furthermore, the bending characteristics of the spacer profile 1 may be improved by such connection portions 40. Furthermore, although the reinforcement layers 22, 24 have been omitted, the required or rather necessary flexural strength is provided by the sheet silicate in the synthetic material of the side walls 16, 18, the inner wall 12, and the outer wall 14, in such an embodiment.
Furthermore, in the spacer profile 1 according to the second embodiment, no curvature 21 in the outer wall is provided.
In this embodiment, the diffusion barrier portion 34 is smaller than in the second embodiment such that a certain amount of sheet silicate may be saved.
The fourth and fifth embodiments basically correspond to the first embodiment. In both embodiments, the diffusion barrier portion 34 is formed centrally between the side walls 16, 18 over the second width b2 in the lateral direction X and has a third thickness d3 in the height direction Y. In the fourth and fifth embodiments, the third thickness d3 is larger than the first wall thickness s1 of the outer wall 14. Accordingly, the diffusion resistance or diffusion impermeability of the diffusion barrier portion 34 may be increased.
Furthermore, in the central portion 25 or rather in the diffusion barrier portion 34, the edge of the first reinforcement layer 22 in the lateral direction X on the outer wall 14 facing the second side wall 18 is angled toward the chamber 20, in the fourth embodiment (left side). Furthermore, also the extension portion 26 in the inner wall 12 is angled toward the chamber 20 at the edge of the first reinforcement layer 22 facing the second side wall 18. The second reinforcement layer 24 is formed symmetrically to the first reinforcement layer 22, although not shown in
In the fifth embodiment, the reinforcement layers 22, 24 do not have angled edges. Due to the angled edges, the stiffness or rather rigidity and the diffusion resistance of the spacer profile 1 according to the fourth embodiment are higher than these of the spacer profile 1 according to the fifth embodiment.
Furthermore, in both embodiments, the inner wall 12 comprises openings 44 located centrally with respect to the lateral direction X, the openings 44 being formed in the inner wall 12 by perforation. Forming of the openings 44 by perforation allows a quick and cheap manufacturing process.
The below described seventh to twelfth embodiments comprise a diffusion resistant or rather impermeable diffusion barrier 36 constituted by the first reinforcement layer 22, the diffusion barrier portion 34 and the second reinforcement layer 24, respectively.
a) and b) show cross-sectional views of a spacer profile 1 according to a seventh and an eighth embodiment. In the seventh embodiment, the diffusion barrier portion 34 is formed unsymmetrically or rather asymmetrical. The diffusion barrier portion 34 extends over the entire outer wall 14 into the connection portion 46 between the first side wall 16 and the outer wall 14. On the opposite side in the lateral direction X, the diffusion barrier portion 34 does not extend into the connection portion 46 between the second side wall 18 and the outer wall 14. Furthermore, the spacer profiles 1 according to the seventh and eighth embodiments comprise reinforcement layers 22, 24 having extension portions 26. The extension portions 26 respectively have a 180° bend such that the bend-adjacent portion of the extension portion 26 extends in the height direction Y. Therefore, a three-sided enclosure of a part of the material of the hollow profile body 10 is achieved although only one bend 28 is present. This leads to improved bending and rigidity characteristics.
Furthermore, due to reinforcement layers 22, 24 following the concave connection portions 46, the rigidity and/or bending characteristics may be improved.
In
In
If the extension portions 26 have a bent, angled and/or folded configuration as explained above, the length (in the cross-section perpendicular to the longitudinal direction) of the extension portion 26, and thus the mass of the reinforcement layer 22, 24 additionally introduced in this region or area of the spacer profile 1, can significantly be increased (see
The features of the different embodiments may be combined with each other. The diffusion barrier portion 34 may be formed as a part or portion of arbitrary sections or portions of the walls of the hollow profile body 1, as long as a continuous diffusion barrier 36, which is diffusion resistant with respect to the intervening space 53 of the panes, is provided.
If reinforcement layers 22, 24 are present, an overlapping of the diffusion barrier portion 34 and the reinforcement layers 22, 24 may not necessarily required as long as not too much molecules can diffuse at the respective edges. For example, this may be achieved by providing reinforcement layers 22, 24 having edges being angled towards the diffusion barrier portion 34 in the diffusion barrier portion 34. Therefore, the overlapping may be omitted on one or on both sides or may be formed unsymmetrically.
The third thickness d3 of the diffusion barrier portion 34 may arbitrarily vary as long as the required diffusion resistance is achieved. The embodiment shown in
The sheet silicate or rather the sheet silicate lamellas 38 may be oriented and arranged in the synthetic material such that a particularly good bending characteristic and rigidity of the spacer profile is achieved. In particular, by purposefully arranging the sheet silicate lamellas 38 in the synthetic material, a spacer profile may be formed, wherein a reinforcement layer can be omitted completely corresponding to the second and third embodiment, while at the same time the diffusion resistance is not changed and the bending characteristics are improved.
Likewise, by purposefully arranging the sheet silicate lamellas 38, the bending characteristic of the spacer profile 1 may be influenced such that the curvatures 21, 121 or rather the notches 42, as, for example, shown in
Furthermore, the reinforcement layers 22, 24, as shown in the first to twelfth embodiments, may be formed symmetrically to each other with respect to the plane of symmetry L. The first reinforcement layer 22 may have a thickness different to the second reinforcement layer 24, or rather may be made of a different material. The first or second reinforcement layer 22, 24 may comprise an extension portion 26 while the corresponding other reinforcement layer 22, 24 does not have an extension portion 26. The reinforcement layers 22, 24 may extend on the side walls 16, 18, only, and the diffusion barrier portion 34 may extend over the entire outer wall 14 to connect the reinforcement layers 22, 24. The reinforcement layers 22, 24 optionally extend partly in the side walls 16, 18 or rather in the outer wall 14 but are always connected to the diffusion barrier portion 34.
The first or second reinforcement layers 22, 24 may extend over the larger portion or area of the outer wall than the corresponding other reinforcement layer 22, 24. That means, the distance of the central portion 25 to the first side wall 16 may be larger than the distance to the second side wall 18 and vice versa.
The central portion 25 is not necessarily arranged centrally between the side walls 16, 18. By arranging the central portion 25 not centrally, the heat conduction through the spacer profile 1 may be decreased. In particular, the heat conduction is decreased if the central portion 25 is located closer to the “warm”, i.e. inner pane.
Alternatively to co-extruding the reinforcement layers 22, 24 together with the hollow profile body 10, the reinforcement layers 22, 24 may be applied directly on the hollow profile body 10 after extruding the hollow profile body 10, for example, by an adhesion agent or glue. Further, the portion on the hollow profile body 10 intended for (receiving) the reinforcement layers 22, 24 may be formed such that no breaks are provided at the edges and transitions between the corresponding parts after applying the reinforcement layers 22, 24. That means, the portions, on which, for example, the reinforcement layers 22, 24 are applied, are already formed as recesses in the hollow profile body 10 when extruding the hollow profile body 10. Accordingly, the reinforcement layers 22, 24 may be inserted into theses recesses.
Furthermore, the diffusion barrier portion 34 and the hollow profile body 10 may be connected after the extrusion process.
The hollow profile body 10 may have the shape of a trapezoid, quadrate, rhombus, or any other body. The concave connection portions 46 may be shaped different, for example, double bulged, asymmetrically bulged, etc. In particular, the spacer profile 1 may be formed such that the side walls 16, 18 are not the outermost walls in the lateral direction X intended to contact the panes. Such an embodiment may be formed, for example, as follows: the spacer profile 1 may comprise an inner wall 12 being broader with respect to the outer wall 14. The side walls 16, 18 may be not connected with the edges of the inner wall 12 in the lateral direction X but may be arranged offset or displaced by a small distance inwardly in the lateral direction X. The outer wall 14, which is connected to the side walls 16, 18, the side walls 16, 18, and the inner wall 12 may constitute the chamber 20. Additionally, at the edges of the inner wall 12 in the lateral direction X, two further outer (side) walls extending parallel to the side walls 16, 18 may be provided, the additional outer (side) walls serving as a contact surface for the panes. In such an embodiment, the reinforcement layers 22, 24 may be formed completely or partly in or on the additional outer walls, the side walls 16, 18, and the inner wall 12.
The wall thicknesses s1, s2 of the side walls 16, 18 and/or of the outer wall 14 may be different to each other. The openings 44 may be formed asymmetrically to the plane of symmetry L or only centrally or only on one side with respect to the lateral direction X. The openings 44 may be arranged uniformly or erratically in the longitudinal direction Z. With respect to the lateral direction X, the openings 44 may be arranged in a single row or in a plurality of rows in the longitudinal direction with respect to the lateral direction X.
In or on the inner wall 12, at least partly a further reinforcement layer made of metal material may be provided. The extension portions 26 may be arbitrarily formed, angled etc. or rather unsymmetrical to each other. The chamber 20 may be divided into a plurality of chambers by dividing walls. The cross-section of the reinforcement layers 22, 24 does not necessarily have to be constant but may have a profiled form such that the connection between the reinforcement layers 22, 24 and the hollow profile body 10 is further improved. Furthermore, knobs and grooves may be provided.
The first height h1 of the hollow profile body 10 in the height direction Y is preferably between 10 mm and 5 mm, more preferably between 8 mm and 6 mm, for example 6.85 mm, 7 mm, 7.5 mm or, 8 mm.
The second height h2 of the curvature 21 in the height direction Y is preferably between 2 mm and 0.05 mm, more preferably between 1 mm and 0.1 mm, for example 0.5 mm, 0.8 mm, or 1 mm.
The third height h3 of the curvature 121 in the height direction Y is preferably between 2 mm and 0.05 mm, more preferably between 1 mm and 0.05 mm, still more preferably between 0.5 mm and 0.05 mm, for example 0.1 mm, 0.12 mm, or 0.15 mm.
The first width b1 of the hollow profile body 10 in the lateral direction X is preferably between 40 mm and 6 mm, more preferably between 25 mm and 6 mm, and still more preferably between 16 mm and 6 mm, for example 8 mm, 12 mm, or 15.45 mm.
The second width b2 of the diffusion barrier portion 34 in the lateral direction X is preferably between 10% to 100% of the first width b1, more preferably between 30% and 90% of the first width b1, for example 30% or 40%, . . . , 80%, 90% of the first width, accordingly, for example, b2=5 mm, b1=10 mm.
The third width (b2−a1)/2 of the overlapping in the lateral direction X is preferably about b1−b2, but more preferably at least 1 mm, and still more preferably between 1 mm and 10 mm, for example 2 mm, 5 mm, 8 mm, or 10 mm.
The fourth width b4 of a sheet silicate lamella 38 in the lateral direction X is on average between 20 nm and 10000 nm, for example 100 nm, 500 nm, or 5000 nm.
The first distance a1 in the lateral direction X between the reinforcement layers 22, 24 is preferably between 10% to 100% of the first width b1, more preferably between 0.9 b2 and 0.5 b2.
The second distance a2 in the lateral direction X between adjacent sheet silicate lamellas 38 is on average preferably between 0.1 nm and 200 nm, more preferably between 0.1 nm and 50 nm, for example 1 nm, 3 nm, or 50 nm.
The third distance a3 in the height direction Y between two adjacent sheet silicate lamellas 38 is on average preferably between 0.1 nm and 200 nm, more preferably between 0.1 nm and 50 nm, for example 1 nm, 3 nm, or 50 nm.
The fourth distance a4 in the longitudinal direction Z between two adjacent sheet silicate lamellas 38 is on average preferably between 0.1 nm and 200 nm, more preferably between 0.1 nm and 50 nm, for example 1 nm, 3 nm, or 50 nm.
The first thickness d1 of the first reinforcement layer 22 made of metal material is preferably between 0.5 mm and 0.01 mm, more preferably between 0.2 mm and 0.1 mm, for example 0.1 mm, 0.05 mm or 0.01 mm.
The second thickness d2 of the second reinforcement layer 24, 124 preferably corresponds to the first thickness d1.
The third thickness d3 of the diffusion barrier portion 34 made of synthetic material with sheet silicate is preferably between 2 mm and 0.1 mm, more preferably between 1.2 mm and 0.4 mm, and further more preferably between 1.2 mm and 0.6 mm, for example 0.6 mm, 1.0 mm, or 1.2 mm.
The fourth thickness d4 of a sheet silicate lamella 38 is on average preferably between 0.1 nm and 10 nm, more preferably between 0.1 nm and 5 nm, and further more preferably between 1 nm and 5 nm, as for example 1 nm, 2 nm, or 4 nm.
The first length of the extension portions 26 in the lateral direction X is preferably 0.1 b1<l1<0.4 b1, more preferably 0.2 b1<l1<0.4 b1 and further more preferably 0.2 b1<l1<0.3 b1.
The first wall thickness s1 of the side walls 16, 18 and the outer wall 14 is preferably between 1.2 mm and 0.2 mm, more preferably between 1.0 mm and 0.5 mm, for example 0.5 mm, 0.6 mm, or 0.7 mm.
The second wall thickness s2 of the inner wall 12 is preferably between 1.5 mm, 0.5 mm, for example 0.7 mm, 0.8 mm, 0.9 mm, or 1.0 mm.
The second length 12 of a sheet silicate lamella 38 in the longitudinal direction Z is on average preferably between 20 nm and 20000 nm, for example 100 nm, 500 nm or 5000 nm.
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 compositions of the features in the embodiments and/or the claims. It is explicitly stated that all value ranges or indications of groups of entities disclose every possible intermediate value or intermediate entity for the purpose of original disclosure as well as for the purpose of restricting the claimed invention, in particular as limits of value ranges.
1 spacer profile
10 hollow profile body
12 inner wall
14 outer wall
16 first side wall
18 second side wall
20 chamber
21, 121 curvature (arch, concavity)
22 first reinforcement layer
24 second reinforcement layer
25 central portion
26 extension portion (or elongation portion)
28 bend in the extension portion
30 groove in the extension portion
32 accommodation portion (retaining portion)
34 diffusion barrier portion
36 diffusion barrier
38 sheet silicate lamella (lamina, part)
40 sheet plane (atomic layer, layer plane, layer level)
42 notch
44 opening
46 connection portion
50 spacer frame
51, 52 panes (glass panes)
53 intervening space (between) panes
54 connector
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2001-009-359.1 | Jan 2011 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP12/00385 | 1/24/2012 | WO | 00 | 7/24/2013 |
