(19)
(11)EP 3 643 869 A1

(12)EUROPEAN PATENT APPLICATION

(43)Date of publication:
29.04.2020 Bulletin 2020/18

(21)Application number: 18201734.3

(22)Date of filing:  22.10.2018
(51)Int. Cl.: 
E06B 3/663  (2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(71)Applicant: Technoform Glass Insulation Holding GmbH
34253 Lohfelden (DE)

(72)Inventors:
  • Sommer, Petra
    34253 Lohfelden (DE)
  • DOLCERA, Dr., Matteo
    34253 Lohfelden (DE)
  • LENZ, Jörg
    34253 Lohfelden (DE)

(74)Representative: Kramer Barske Schmidtchen Patentanwälte PartG mbB 
European Patent Attorneys Landsberger Strasse 300
80687 München
80687 München (DE)

  


(54)SPACER FOR AN INSULATING GLAZING UNIT PREVENTING THERMAL STRESS


(57) A spacer for an insulating glazing unit having at least two spaced glazing panes connected at their edges via the spacer in a mounted state in which the spacer is mounted at the edges to limit an interspace (filled with gas, the spacer comprising
an inner wall (14) connecting the side walls on the inner side facing the interspace,
wherein the inner wall (14) comprises a recess portion (14rs) allowing to change the length of the inner wall in the width direction in response to an external pressure force or external tensional force applied to the side walls (11, 12).




Description


[0001] The present invention relates to a spacer for insulating glass units, especially but not only suitable for compensating climate stress in insulating glass units.

Background technology



[0002] Heating and cooling of an insulting glazing unit IGU may be caused by usual climate changes in winter and summer, the weather, the change of day and night, or air conditioning and heating. Heating and cooling or wind pressure may cause climate stress in form of significant pressure differences between the gas volume in an IGU and the outside atmosphere and corresponding bending or curvatures of the glazing panes of the IGU. This results in high stress on the edge bond of the IGU, which leads to escaping of internal gas or to penetration of water. Both significantly reduce the performance of the IGU. In case of climate loads, the secondary sealant needs to act as spring and damper. The stiffer the spacer is, the more the secondary sealant needs to compensate. Otherwise the stress on primary sealant is too high.

[0003] US 6,823,644 and US 2006/201105 A1 disclose a spacer design for compensating climate stress at the spacer in an insulating glass unit (IGU), in which sections of the inner wall facing the interspace between glazing panes of the IGU, are separated and movable relative to each other.

[0004] WO 2004/038155 A1 discloses a spacer design with a curved wall design for compensating climate stress at the spacer in an insulating glass unit (IGU). WO 2004/063801 A1 discloses a spacer design with a curved wall design.

[0005] WO 2004/05783 A2 discloses muntin bar designs for compensating climate stress at the muntin bars in an insulating glass unit (IGU).

[0006] It is an object of the present invention to provide an improved spacer design for compensating climate stress in an insulating glass unit (IGU).

[0007] This object is achieved by a spacer for insulating glass units according to claim 1 or an IGU according to claim 15 or a window or door or facade element according to claim 16.

[0008] Further developments are given in the dependent claims.

[0009] Further features and advantages will become apparent from the descriptions of embodiments referring to the drawings, which show:
Fig. 1
a cross-sectional view of a spacer according to according to a first embodiment perpendicular to its longitudinal direction;
Fig. 2
a cross-sectional view of a spacer according to according to a second embodiment perpendicular to its longitudinal direction;
Fig. 3
a cross-sectional view of a spacer according to according to a third embodiment perpendicular to its longitudinal direction;
Fig. 4
a cross-sectional view of the spacer according to according to the second embodiment perpendicular to its longitudinal direction with indication of dimensions;
Fig. 5
a partial perspective cross-sectional view of an insulating glazing unit with a spacer;
Fig. 6
a side view, partially cut away, of a spacer frame bent from a spacer profile;
Fig. 7
a cross-sectional view of a conventional spacer perpendicular to its longitudinal direction;
Fig. 8
a partial cross-sectional view of an insulating glazing unit with the spacer of Fig. 7;
Fig. 9
a partial cross-sectional view of an insulating glazing unit corresponding to Fig. 8 exemplifying the effect of increased gas pressure in the IGU; and
Fig. 10
a partial cross-sectional view of an insulating glazing unit corresponding to Fig. 8 exemplifying the effect of reduced gas pressure in the IGU.


[0010] Fig. 5 shows a partial perspective view and Fig. 8 shows a cross-sectional view of an insulating glazing unit (IGU) 40 with a spacer 50. The IGU 40 comprises two glazing panes 51, 52 arranged parallel to each other with a predetermined distance between the same. A spacer 50 extends in a longitudinal direction z along the edges of the glazing panes 51, 52.

[0011] As shown in Fig. 6, the spacer 50 is used to form a spacer frame, e. g. by cold-bending the spacer profile into a frame shape and connecting the ends with a linear connector 54 as known in the art. Other ways to form a spacer frame like cutting linear pieces of spacer frame parts and connecting the same via edge connectors are also possible as know in the art.

[0012] The spacer (frame) 50 is mounted at the edges of the two spaced glazing panes 51, 52. As is shown in Fig. 5, 7 and 8, the spacer 50 comprises side walls formed as attachment bases to be adhered with the inner sides of the glazing panes 51, 52 using an adhesive material (primary sealing compound) 61, e.g., a butyl sealing compound based upon polyisobutylene. The intervening space 53 between the glazing panes is thus defined by the two glazing panes 51, 52 and the spacer profile 50. The inner side of the spacer profile 50 faces the intervening space 53 between the glazing panes 51, 52. On the (outer) side facing away from the intervening space 53 between the glazing panes in the height direction y, a mechanically stabilizing sealing material (secondary sealing compound) 62, for example based upon polysulfide, polyurethane or silicon, is introduced into the remaining, empty space between the inner sides of the window panes in order to fill the empty space. This sealing compound also protects a diffusion barrier layer 30 provided at least on the outer side of the spacer 50. It is also possible to use other possibilities than a gas diffusion barrier layer 30 to provide gas diffusion-proof characteristics like selecting corresponding gas diffusion-tight materials for the body of the spacer profile.

[0013] The interspace 53 between the glazing panes 51, 52 is usually filled with a gas having good heat insulating characteristics like a rare gas such as argon or xenon. Thus, a gas filled interspace 53 is present between the glazing panes 51, 52 and the spacer (frame) 50 in the mounted state.

[0014] As shown in Fig. 5, 7 and 8, the spacer 50 comprises a spacer profile body 10. The side walls 11, 12 of the spacer are formed as attachment bases for attachment to the inner sides of the glazing panes. In other words, the spacer is adhered to the respective inner sides of the glazing panes via these attachment bases and the primary sealing compound 61 (see Fig. 5, 8). In addition, the spacer 50 is adhered to the respective inner sides of the glazing panes via the secondary sealing compound 62 (see Fig. 5, 8).

[0015] A spacer 50 according to a first embodiment is shown in Fig. 1. Such a spacer 50 is designed and adapted to be mounted in an IGU 40 in the way shown in Fig. 5 or 8 instead of a spacer of the type shown in Fig. 5 or 7 or 8. The side of the spacer 50, which is the upper side in Fig. 1 and which is the non-diffusion proof side and thus designed to face the gas filled interspace 53 in the mounted state, is named the inner side of the spacer in the following.

[0016] The spacer extends with an essentially constant cross-section x-y in the longitudinal direction z with an overall height h1 in the height direction y perpendicular to the longitudinal direction z. The side walls 11, 12 having a predetermined distance w1 between their lateral outer sides in the width direction x in a state in which no external pressure force or external tensional force is applied to the side walls. The spacer 50 has a generally rectangular cross section perpendicular to the longitudinal direction z.

[0017] As shown in Fig. 1, the spacer 50 comprises a spacer profile body 10. The spacer profile body 10 may be made by extrusion of polyamide 66 with 25 % glass fibre reinforcement (PA66 GF 25) or could also be made of polypropylene PP with fibre reinforcement or other suitable materials. The profile body 10 extends in the longitudinal direction z with the two lateral side walls 11, 12 and an inner wall 14 located on the inner side of the spacer and adapted to face the gas filled interspace 53 in the mounted state.

[0018] Seen in the cross-section x-y perpendicular to the longitudinal direction z, the two side walls 11, 12 are separated by a distance in the traverse (width) direction x and extend essentially in the height direction y towards the inner side of the spacer up to inner ends 11e, 12e. The side walls 11, 12 are adapted to face the glazing panes 51, 52 in the width direction x perpendicular to the longitudinal direction z. The side walls 11, 12 are connected via the inner wall 14 on the inner side of the spacer.

[0019] A one-piece diffusion barrier film 30 is formed on the outer side of the spacer which faces away from the gas filled interspace 53 (from the inner side of the spacer) and on the side walls 11, 12. The diffusion barrier film 30 may be made of metal like stainless steel or of another diffusion proof material like diffusion-proof multilayer foils. The diffusion barrier film 30 may optionally be designed to also serve as a reinforcement element. Fig. 1 shows wires 31 as other optional reinforcement elements.

[0020] An outer wall 13 may optionally be formed on the outer side of the spacer, as shown in Fig. 1. In such a case, the diffusion barrier film 30 is formed on the outer wall 13 as shown in Fig. 1.

[0021] A chamber 20 is formed for accommodating hygroscopic (desiccating) material. The chamber 20 is defined in cross-sectional view perpendicular to the longitudinal direction z by on its respective lateral sides the side walls 11, 12 and on its side facing the interspace 53 by the inner wall 14. Openings 15 are formed in the inner wall 14 (not shown in Fig. 1 but see Fig. 5), so that the inner wall 14 is formed to be non-diffusion-proof allowing gas exchange between the gas filled interspace 53 and the chamber 20. In addition or in the alternative, to achieve a non-diffusion-proof design, it is also possible to select the material for the entire profile body and/or the inner wall, such that the material permits an equivalent diffusion without the formation of the openings 15.

[0022] The inner wall 14 comprises a recess portion 14rs having a depth dr in the height direction y and a width w2 in the width direction x allowing to change the length of the inner wall 14 in the width direction in response to an external pressure force or external tensional force applied to the side walls 11, 12 as it occurs in case of climate stress.

[0023] The recess portion 14rs has, seen in the cross-section x-y perpendicular to the longitudinal direction z, a rectangular shape with three side portions 14sl, 14sh, 14sr formed by the inner wall 14 and an open side facing the gas filled interspace 53 in the mounted state.

[0024] The recess portion 14rs has a depth dr in the height direction y in a range of 1.5 mm to 2 mm, such as 1, 5 mm or 1.75 mm or 2 mm, and a width w2 in the width direction x in a range of 2.5 mm to 4 mm, such as 2.5 mm or 3 mm or 3.5 mm or 4 mm. These values are especially suitable for spacers with a width w1 of 10 to 20 mm and a height h1 of 6 to 8 mm. In general, the depth dr of the (rectangular cross section) recess portion 14rs can be up to 50% of overall height h1 of spacer profile and the width w2 can reach up to 50% of overall width w1 of spacer profile.

[0025] The recess portion 14rs is centered in the inner wall 14 in the width direction x. It is also possible that the recess portion 14rs has an off-center position, especially if the applied forces may be not symmetrical. However, the centered position is preferred.

[0026] The recess portion 14rs of the inner wall 14 has a wall thickness which is in a range 20% to 80% of the wall thickness of the other parts of the inner wall 14. The wall thickness of the inner wall is, e.g. 0.5 mm and the thickness of the recess portion is 0.3 mm, i.e., 60%.

[0027] The transitions of the side portions 14sl, 14sh, 14sr and the other portions of the inner wall 14 are preferably rounded as shown in Fig. 1

[0028] The depth dr of the recess portion 14rs in the height direction y is measured relative to a straight imaginary line connecting the ends of the connections between the inner wall 14 and the side walls 11, 12 in the height direction y. This imaginary line is not completely shown in fig. 1 but the end of the imaginary line is shown as hatched line in Fig. 1 at the upper end of the arrow for measure dr.

[0029] A spacer 50 according to a second embodiment is shown in Fig. 2 and 4. In Fig. 4, dimensions for a specific size of a spacer are indicated. The spacer 50 of the second embodiment differs from the spacer 50 of the first embodiment essentially in that it comprises a recess portion 14rt instead of the recess portion 14rs.

[0030] The recess portion 14rt has, seen in the cross-section x-y perpendicular to the longitudinal direction z, a triangular shape with two side portions 14tl, 14tr and an apex 14ta between the same formed by the inner wall 14 and an open side facing the gas filled interspace 53 in the mounted state. The remaining design and features are the same as in the first embodiment unless described differently in the following.

[0031] The inner wall 14 comprises the recess portion 14rt having a depth dr in the height direction y and a width w2 in the width direction x allowing to change the length of the inner wall 14 in the width direction in response to an external pressure force or external tensional force applied to the side walls 11, 12 as it occurs in case of climate stress.

[0032] The recess portion 14rt has, seen in the cross-section x-y perpendicular to the longitudinal direction z, the above described triangular shape.

[0033] The recess portion 14rt has a depth dr in the height direction y in a range of 1.5 mm to 2.5 mm, such as 1, 5 mm or 1.75 mm or 2 mm or 2.25 mm or 2.5 mm, and a width w2 in the width direction x in a range of 3.5 mm to 5 mm, such as 3.5 mm or 4 mm or 4.5 mm or 5 mm. These values are especially suitable for spacers with a width w1 of 10 to 20 mm and a height h1 of 6 to 8 mm. In general, the depth dr of the (triangular cross section) recess portion 14rt can reach up to 50% of overall height h1 of spacer profile and the width w2 can be up to 60% of overall width w1 of spacer profile.

[0034] The recess portion 14rt of the inner wall 14 has a wall thickness which is in a range 20% to 80% of the wall thickness of the other parts of the inner wall 14. The wall thickness of the inner wall is, e.g. 0.5 mm and the thickness of the recess portion is 0.3 mm, i.e., 60%.

[0035] The transitions of the side portions 14tl, 14tr and an apex 14ta and the other portions of the inner wall 14 are preferably rounded as shown in Fig. 2 and 4.

[0036] The depth dr of the recess portion 14rt in the height direction y is measured relative to a straight imaginary line connecting the ends of the connections between the inner wall 14 and the side walls 11, 12 in the height direction y. This imaginary line is not completely shown in Fig. 2 but the end of the imaginary line is shown as hatched line in Fig. 2 at the upper end of the arrow for measure dr.

[0037] A spacer 50 according to a third embodiment is shown in Fig. 3. The spacer 50 of the third embodiment differs from the spacer 50 of the first embodiment essentially in that it comprises a recess portion 14rc instead of the recess portion 14rs.

[0038] The recess portion 14rc has, seen in the cross-section x-y perpendicular to the longitudinal direction z, a curved shape with curved portions 14cl, 14cr and a thin portion 14ct formed by the inner wall 14 and a convex curvature facing away from the gas filled interspace 53 in the mounted state. The curvature could also be described as concave seen from the chamber 20. The remaining design and features are the same as in the first embodiment unless described differently in the following.

[0039] The inner wall 14 comprises the recess portion 14rc having a depth dr in the height direction y and a width w2 in the width direction x allowing to change the length of the inner wall 14 in the width direction in response to an external pressure force or external tensional force applied to the side walls 11, 12 as it occurs in case of climate stress.

[0040] The recess portion 14rt has, seen in the cross-section x-y perpendicular to the longitudinal direction z, the above described curved shape.

[0041] The recess portion 14rc has a depth dr in the height direction y in a range of 1.5 mm to 2.5 mm, such as 1, 5 mm or 1.75 mm or 2 mm or 2.25 mm or 2.5 mm, and a width w2 in the width direction x in a range of 4 mm to 9 mm, such as 4 mm or 5 mm or 6 mm or 7 mm or 8 mm or 9 mm. These values are especially suitable for spacers with a width w1 of 10 to 20 mm and a height h1 of 6 to 8 mm. In general, the depth dr of the (curved cross section) recess portion 14rc can be up to 50% of overall height h1 of spacer profile and the width w2 can reach up to 80% of overall width w1 of spacer profile.

[0042] The recess portion 14rc of the inner wall 14 has a minimum wall thickness dt which is in a range 20% to 80% of the wall thickness of the other parts of the inner wall 14. The wall thickness diw of the inner wall is, e.g. 0.8 mm and the thickness of the recess portion is 0.4 mm, i.e., 50%.

[0043] The depth dr of the recess portion 14rc in the height direction y is measured relative to a straight imaginary line connecting the ends of the connections between the inner wall 14 and the side walls 11, 12 in the height direction y. This imaginary line is not completely shown in Fig. 3 but the end of the imaginary line is shown as hatched line in Fig. 3 at the upper end of the arrow for measure dr.

[0044] The IGU of Fig. 5 or 8 is subject to heating and cooling due to external conditions. If the IGU is heated, the gas in the interspace 53 is heated and, because the interspace is hermetically sealed, the gas pressure in the interspace 53 increases in comparison to the (atmospheric) pressure outside the IGU. The result are pressure forces acting on the glazing panes and bending the same to convex shapes as shown in Fig. 9. If the IGU is cooled, the opposite effect occurs. The gas in the interspace 53 is cooled and, because the interspace is hermetically sealed, the gas pressure in the interspace 53 decreases in comparison to the (atmospheric) pressure outside the IGU. The result are pressure forces acting on the glazing panes and bending the same to concave shapes as shown in Fig. 10.

[0045] As a result of heating the IGU, tensile stress forces FTS act on the primary sealing 61 in the region at the inner ends 11e, 12e of the lateral side walls 11, 12 of the spacer 50 located at the inner side facing the interspace 53 as shown in Fig. 9. These tensile stress forces FTS may cause a separation of the primary sealing from the glazing pane and/or the spacer and thus damage the sealing effect, which is detrimental to the long term life if IGUs due to cycling behaviour. The pressure forces Fp acting on the spacer at the remote ends 11f, 12f of the side walls 11, 12 of the spacer remote to the interspace 53 and on the secondary sealing are not so problematic although they cause stress (compression) to primary and secondary sealing materials.

[0046] As a result of cooling the IGU, tensile stress forces FTS act on the primary sealing 61 in the region at the remote ends 1 If, 12f of the side walls 11, 12 of the spacer remote to the interspace 53 and on the secondary sealing as shown in Fig. 10. These tensile stress forces FTS may cause a separation of the primary and/or secondary sealings from the glazing pane and/or the spacer and thus damage the sealing effect, which is detrimental to the long term life if IGUs due to cycling behaviour. The pressure forces FT acting on the spacer in the region at the inner ends 11e, 12e of the lateral side walls 11, 12 of the spacer 50 located at the inner side facing the interspace 53 are not so problematic although they cause stress (compression) to primary and secondary sealing materials.

[0047] The effects of heating and cooling an IGU may be caused by usual climate changes in winter and summer, the weather, the change of day and night, or air condition and heating. Therefore, the effects occur alternating and threaten the intended lifetime of IGUs.

[0048] The recess portion 14rs of the first embodiment allows the inner ends 11e, 12e of the side walls 11, 12 to move away from each other in reaction to tensile stress forces FTS shown in Fig. 9. The recess portion 14rs also allows the inner ends 11e, 12e of the side walls 11, 12 to move towards each other in reaction to pressure forces Fp shown in Fig. 10. The reason is that the recess portion allows a change of the length of the inner wall 14 in the width direction in response to an external pressure force or external tensional force applied to the side walls 11, 12 as it occurs in case of climate stress. The recess portion 14rs has three side portions 14sl, 14sh, 14sr, which can change their relative angles and the relative angles to the other portions of the inner wall 14 under tension or pressure. By change of the relative angles, the length of the inner wall 14 inevitably varies in the width direction x.

[0049] In other words, the recess portion 14rs allows to change the distance between the lateral outer sides of the side walls 11, 12 at the inner ends 11e, 12e from the predetermined distance w1 in a state in which an external pressure force or an external tensional force is applied to the side walls. With dimensions of the recess portion 14rs of dr = 1.5 mm and w2 = 2.5 mm for a spacer with a width w1 = 16 mm and a height h1 = 7 mm, a change of the width in a range up to 0.7 mm is achievable.

[0050] Thus, an improved spacer for IGUs is provided with superior climate stress compensation characteristics. Such improved spacer is flexible enough by its design to reduce the stress on the primary and also the secondary sealing material such that gas loss is reduced and the overall lifetime of the IGU can be extended. Additionally, less amount of secondary sealing material can be used thus improving the thermal performance of the IGU.

[0051] The same applies to the recess portion 14rt of the second embodiment, which is the presently preferred embodiment. In the second embodiment, the relative angles can change in a similar way in response to an external pressure force or external tensional force applied to the side walls 11, 12 as it occurs in case of climate stress.

[0052] Essentially the same also applies to the third embodiment. Due to the curved design of the recess portion 14rc, the length change of the inner wall 14 is obtained by straightening the curvature or increasing the curvature.

[0053] 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 composition 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.


Claims

1. Spacer for an insulating glazing unit (40), which insulating glazing unit has at least two spaced glazing panes (51, 52) connected at their edges via the spacer (50) in a mounted state in which the spacer is mounted at the edges to limit an interspace (53) filled with gas, the spacer extending with an essentially constant cross-section (x-y) in a longitudinal direction (z), the spacer comprising
a plastic body (10) extending in the longitudinal direction (z) with two lateral side walls (11, 12) and an inner wall (14) located on an inner side of the spacer adapted to face the gas filled interspace (53) in the mounted state, in which
the side walls are adapted to face the glazing panes in a width direction (x) perpendicular to the longitudinal direction (z),
the side walls (11, 12) extend, in the cross section (x-y), in a height direction (y) perpendicular to the longitudinal direction (z) and the width direction (x) towards the inner side up to inner ends (11e, 12e),
the side walls have a predetermined distance (w1) between their lateral outer sides at the inner ends in a state in which no external pressure force or external tensional force is applied to the side walls,
the inner wall (14) connects the side walls on the inner side of the spacer,
the inner wall (14) comprises a recess portion (14rs, 14rt, 14rc) having a depth (dr) in the height direction (y) of at least 1.5 mm and a width (w2) in the width direction (x) of at least 2.5 mm allowing to change the length of the inner wall in the width direction in response to an external pressure force or external tensional force applied to the side walls (11, 12).
 
2. Spacer according to claim 1, wherein
the recess portion (14rs) has, in the cross section (x-y), a rectangular shape with three side portions (14sl, 14sh, 14sr) formed by the inner wall (14) and an open side facing the gas filled interspace (53) in the mounted state.
 
3. Spacer according to claim 2, wherein
the recess portion (14rs) has a depth (dr) in the height direction (y) is in a range of 1.5 mm to 2 mm and a width (w2) in the width direction (x) in a range of 2.5 mm to 4 mm.
 
4. Spacer according to claim 2, wherein
the recess portion (14rs) has a depth (dr) in the height direction (y) of up to up to 50% of an overall height (h1) of the spacer and a width (w2) in the width direction (x) of up to 50% of an overall width (w1) of the spacer.
 
5. Spacer according to claim 1, wherein
the recess portion (14rt) has, in the cross section (x-y), a triangular shape with two side portions (14tl, 14tr) and an apex (14ta) between the same formed by the inner wall (14) and an open side facing the gas filled interspace (53) in the mounted state.
 
6. Spacer according to claim 5, wherein
the recess portion (14rt) has a depth (dr) in the height direction (y) is in a range of 1.5 mm to 2.5 mm and a width (w2) in the width direction (x) in a range of 3.5 mm to 5 mm.
 
7. Spacer according to claim 5, wherein
the recess portion (14rt) has a depth (dr) in the height direction (y) of up to up to 50% of an overall height (h1) of the spacer and a width (w2) in the width direction (x) of up to 60% of an overall width (w1) of the spacer.
 
8. Spacer according to claim 1, wherein
the recess portion (14rc) has, in the cross section (x-y), a curved shape with curved portions (14cl, 14ct) and a thin portion (14cr) formed by the inner wall (14) and a concave curvature facing away from the gas filled interspace (53) in the mounted state.
 
9. Spacer according to claim 8, wherein
the recess portion (14rc) has a depth (dr) in the height direction (y) is in a range of 1.5 mm to 2.5 mm and a width (w2) in the width direction (x) in a range of 4 mm to 9 mm.
 
10. Spacer according to claim 8, wherein
the recess portion (14rc) has a depth (dr) in the height direction (y) of up to up to 50% of an overall height (h1) of the spacer and a width (w2) in the width direction (x) of up to 80% of an overall width (w1) of the spacer.
 
11. Spacer according to any one of the preceding claims, wherein
the recess portion (14rs, 14rt, 14rc) is centred in the inner wall (14) in the width direction (x).
 
12. Spacer according to any one of the preceding claims, wherein
the recess portion (14rs, 14rt, 14rc) of the inner wall (14) has a wall thickness (dt) which is in a range 20% to 80% of the wall thickness (diw) of the other parts of the inner wall (14).
 
13. Spacer according to any one of the preceding claims, wherein
the depth (dr) in the height direction (y) of the recess portion (14rc) is measured relative to a straight imaginary line connecting the ends of the connections between the inner wall (14) and the side walls (11, 12) in the height direction (y).
 
14. Spacer according to any one of the preceding claims, wherein
the recess portion (14rs, 14rt, 14rc) has a depth (dr) in the height direction (y) in a range of 1.5 mm to 2.5 mm and a width (w2) in the width direction (x) in a range of 2.5 mm to 9 mm.
 
15. Insulating glazing unit, comprising
at least two spaced glazing panes (51, 52) and a spacer (50) according to any one of claims 1 to 14,
wherein the two glazing panes (51, 52) are connected at their edges via the spacer (50) mounted at the edges to limit a gas filled interspace (53).
 
16. Window, door or facade element comprising an insulating glazing unit (40) according to claim 15.
 




Drawing


























REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description