Window glass

Abstract

A glazing including a first slot cross-section glazing element and a second slot cross-section glazing element is described. The first and second slot cross-section glazing elements (52, 54) are arranged to define a cavity in which the inner glazing element (56) is located. The interior glazing element includes a central portion (56a) made of a first material, a first edge portion (56b) made of a second material and extending along a first side of the central portion, and a second edge portion (56c) made of a third material and extending along a second side of the central portion. The first material is different from the second material, and the first edge portion is bonded to and preferably integrally formed with the central portion of the inner glazing element. In a preferred embodiment, the second edge portion is also bonded to and preferably integrally formed with the central portion. Methods of making interior glazing elements are also described.

Description

Technical Field

[0001] The present invention relates to a glazing having a first groove-section glazing element and a second groove-section glazing element with an inner glazing element between the first groove-section glazing element and the second groove-section glazing element. Background Art

[0002] Glazing units comprising three spaced apart panes of glazing material are known in the art, such glazing units are often referred to as triple glazings. In such triple glazings, each of the glazing elements or panes is typically a flat sheet of glass.

[0003] It is known that glazing elements have a profiled or grooved section configuration. Profiled or grooved section glazing elements are made from a sheet or ribbon of glass and have at least one lateral edge that is bent upwards during manufacture. Typically both lateral edges are bent upwards during manufacture. An example of making a grooved section glazing element is described in DE1496047A1. In the art, the upward facing portion of the grooved section glazing element is known as a "flange", and the lower portion connected to the flange or each flange is known as a "web". Since the grooved section glazing element is made from a continuous sheet or ribbon of glass and is cut to the desired length, the flange is a continuation of the web and is at an angle to it. Typically the flange is at an angle of substantially 90° to the web. Grooved section glazing elements having two lateral flanges are often referred to as U-shaped glazing elements because the grooved section glazing element has a U-shaped cross-section.

[0004] EP 0742324 A1 describes a facade composed of two rows of U-shaped glass sections, one row forming an inner surface layer with its base and the other row similarly forming an outer surface layer, so that the legs of the U-shape fit one inside the other. The cavity is filled with thermal insulation, and a heat reflecting layer is arranged on one of the outer-facing surfaces of the surface layer and / or the thermal insulation. The U-shaped section can be positioned so that it abuts against each other, and the legs of the U-shaped section are connected with PVC sealing strips and / or silicone sealing members. Due to the properties of the thermal insulation, such a glazing unit has limited visible transparency. In addition, the facade with three U-shaped sections described in EP 0742324 A1 is relatively thick (the thickness of such a facade is the distance between the surface facing the outside of the building where the facade is installed and the surface facing the inside of the building where the facade is installed).

[0005] WO2005 / 033432A1 describes a translucent glazing panel comprising: (a) a thermoplastic panel comprising (i) an outer wall having an inner surface defining an inner groove, the inner groove having an inner volume, and (ii) at least one inner wall protruding from the inner surface into the inner groove; and (b) hydrophobic aerogel particles disposed in the groove. Such a glazing panel is translucent and cannot be used in applications requiring low haze.

[0006] WO 2015 / 007899 A2 describes a glazing comprising a sheet of glass between channel-section glazing elements. A clip is used to hold the sheet of glass in place.

[0007] EP 3 260 621 B1 describes a glazing comprising at least one row of shaped glass sheets arranged next to each other and at least one multiple web plate made of plastic, each shaped glass sheet having at least one web and at least one flange. The multiple web plate made of plastic is attached to a separate retaining device rather than to the shaped glass sheets.

[0008] There is a need for an improved glazing unit that can be used in glazing applications requiring improved energy performance. It would be desirable to be able to retrofit such a glazing unit into existing glazing systems. It would also be desirable to be able to simplify the production and installation capabilities of such a glazing unit. Summary of the invention

[0009] Therefore, the present invention provides a window glass from a first aspect, which includes a first groove-section window glass element and a second groove-section window glass element, the first groove-section window glass element and the second groove-section window glass element each including a web and a first flange, the first flange extending along the first side edge of the corresponding web, the first groove-section window glass element and the second groove-section window glass element being arranged so that the end of the first flange of the first groove-section window glass element faces the second groove-section window glass element, and the end of the first flange of the second groove-section window glass element faces the first groove-section window glass element, wherein at least a portion of an internal window glass element is located between the web of the first groove-section window glass element and the web of the second groove-section window glass element, the internal window glass element includes a central portion, a first edge portion and a second edge portion, the central portion is made of a first material, the first edge portion is made of a second material and extends along a first side of the central portion, the second edge portion is made of a third material and extends along a second side of the central portion, the first side of the central portion is opposite to the second side of the central portion; wherein the first material is different from the second material, and further wherein the first edge portion of the internal window glass element is bonded to the central portion of the internal window glass element.

[0010] The first material has a first chemical composition, and the second material has a second chemical composition that is different or substantially different from the first chemical composition.

[0011] The third material has a third chemical composition.

[0012] The glazing according to the present invention has improved energy performance when compared to the same glazing without the internal glazing element. The internal glazing element contributes to improving the thermal insulation properties of the glazing. Furthermore, having different materials for the first edge portion and the central portion allows for providing an internal glazing element having more features in the components of the glazing. The first material may be selected to provide the central portion of the internal glazing element with desired properties for that portion of the internal glazing element, while the second material may be selected to provide the portion of the internal glazing element with other desired properties that may be different from the desired properties for the central portion. Furthermore, by bonding the first edge portion of the internal glazing element to the central portion of the internal glazing element, this contributes to maintaining the position of the first edge portion of the internal glazing element relative to the first flange of the first groove-section glazing element and / or the second groove-section glazing element.

[0013] Preferably, the second edge portion of the inner glazing element is joined to the central portion of the inner glazing element.

[0014] Preferably, the third material is different from the first material and the second material, and the second edge portion of the interior glazing element is bonded to the central portion of the interior glazing element.

[0015] Preferably, the third material is different from the first material and the second material, and the second edge portion of the interior glazing element is bonded to the central portion of the interior glazing element.

[0016] Preferably, the second material is the same as the third material.

[0017] Preferably, the central portion of the inner glazing element is dimensioned to fill the space between the web of the first groove-section glazing element and the web of the second groove-section glazing element.

[0018] Preferably, the glazing is arranged such that there is a first space between a central portion of the inner glazing element and the web of the first groove-section glazing element and / or a second space between a central portion of the inner glazing element and the web of the second groove-section glazing element.

[0019] Preferably, the central portion of the inner glazing element comprises at least one first wall spaced apart from a second wall, the first wall and the second wall of the central portion of the inner glazing element having at least one space therebetween.

[0020] Preferably, the central portion of the interior window glass element has a multi-wall structure, which includes a first wall facing the web of the first groove-section window glass element and a second wall facing the web of the second groove-section window glass element, and there are multiple air spaces between the first wall and the second wall of the central portion of the interior window glass element.

[0021] Such multi-walled plastic sheets are well known in the art, see for example DE 27 22 817 A1, EP 0 050 462 A1, DE 20 201 10 03 120 U1, DE 20 201 1 109 408 U1 and DE 20 201 1 106 659 U1.

[0022] In some embodiments, the web of the first groove section window glass element has a second flange extending along its second lateral edge, and the second lateral edge of the web of the first groove section window glass element is opposite to the first lateral edge of the web of the first groove section window glass element, and more preferably wherein the first groove section window glass element has a U-shaped profile.

[0023] Preferably, the first edge portion of the inner glazing element is adjacent the first flange of the first groove-section glazing element.

[0024] Preferably, the second edge portion of the inner glazing element is adjacent the second flange of the first channel-section glazing element.

[0025] In some embodiments, the web of the second groove section window glass element has a second flange extending along its second lateral edge, and the second lateral edge of the web of the second groove section window glass element is opposite to the first lateral edge of the web of the second groove section window glass element, and more preferably wherein the second groove section window glass element has a U-shaped profile.

[0026] Preferably, the first edge portion of the inner glazing element is adjacent the first flange of the second channel-section glazing element.

[0027] Preferably, the second edge portion of the inner glazing element is adjacent the second flange of the second channel-section glazing element.

[0028] In some embodiments, the second material is the same as the third material, and the first material is different from the second material and the third material.

[0029] In some embodiments, the first edge portion of the inner glazing element is adjacent to the first flange of the first groove-section glazing element.

[0030] In some embodiments, the second edge portion of the inner glazing element is adjacent to the first flange of the second groove-section glazing element.

[0031] In some embodiments, the first edge portion of the interior glazing element comprises a first connection portion, wherein the first connection portion is made from a fourth material, and further wherein the first connection portion is in mechanical communication with the first flange of the first groove-section glazing element.

[0032] The fourth material has a fourth chemical composition.

[0033] Preferably, the fourth material is the same as the second material, such that the fourth chemical composition is the same or substantially the same as the second chemical composition.

[0034] Preferably, the first connecting portion of the inner glazing element is attached to the first flange of the first groove-section glazing element.

[0035] Preferably, the first connecting portion has a multi-walled construction comprising at least a first wall and a second wall with at least one air space between the first wall and the second wall.

[0036] Preferably, the first connecting portion comprises a first element biased against a first flange of the first groove-section element.

[0037] Preferably, the first connecting portion is adhesively attached to the first flange of the first groove-section glazing element.

[0038] In an embodiment in which the web of the first groove-section window glass element has a second flange extending along its second lateral edge, the second lateral edge of the web of the first groove-section window glass element is opposite to the first lateral edge of the web of the first groove-section window glass element, and preferably, the first flange of the second groove-section window glass element is received in the space between the first flange and the second flange of the first groove-section window glass element.

[0039] In some embodiments, the first flanges of the first groove-section window glass element and the second groove-section window glass element each have a corresponding first end opposite to their corresponding webs, and the window glass is arranged so that the first end of the first flange of the first groove-section window glass element faces the first end of the first flange of the second groove-section window glass element.

[0040] In some embodiments, the first flanges of the first groove-section window glass element and the second groove-section window glass element each have a corresponding first end opposite to their corresponding webs, and the window glass is arranged so that the first end of the first flange of the first groove-section window glass element faces the first end of the first flange of the second groove-section window glass element, and the web of the first groove-section window glass element has a second flange extending along its second lateral edge, and the second lateral edge of the web of the first groove-section window glass element is opposite to the first lateral edge of the web of the first groove-section window glass element; and the web of the second groove-section window glass element has a second flange extending along its second lateral edge, and the second lateral edge of the web of the second groove-section window glass element is opposite to the first lateral edge of the web of the second groove-section window glass element; the end of the first flange of the first groove-section window glass element faces the end of the first flange of the second groove-section window glass element, and the end of the second flange of the first groove-section window glass element faces the end of the second flange of the second groove-section window glass element.

[0041] In some embodiments, the second edge portion of the interior window glass element includes a second connection portion, wherein the second connection portion is made of a fifth material, and further wherein the second connection portion is mechanically connected to the first flange of the second groove section window glass element, or when a second flange of the second groove section window glass element is present, the second connection portion is mechanically connected to the second flange of the second groove section window glass element.

[0042] The fifth material has a fifth chemical composition.

[0043] Preferably, the fifth material is the same as the third material, such that the fifth chemical composition is the same or substantially the same as the third chemical composition.

[0044] Preferably, the second connecting portion comprises a first element biased against a first flange of the second groove section element, or against a second flange of the second groove section glazing element when present.

[0045] Preferably, the second connecting portion is adhesively attached to the first flange of the second groove-section glazing element, or to the second flange of the second groove-section glazing element when present.

[0046] Preferably, the second connecting portion has a multi-walled construction comprising at least a first wall and a second wall with at least one air space between the first wall and the second wall.

[0047] In some embodiments, the first edge portion of the interior window glass element includes a first connecting portion made of a fourth material and wherein the first connecting portion is mechanically connected to the first flange of the first groove-section window glass element and the second groove-section window glass element, preferably wherein the first connecting portion of the interior window glass element is attached to the first flange of the first groove-section window glass element and the second groove-section window glass element.

[0048] In some embodiments, the web of the first groove-section window glass element has a second flange extending along its second lateral edge, the second lateral edge of the web of the first groove-section window glass element is opposite to the first lateral edge of the web of the first groove-section window glass element, preferably wherein the first groove-section window glass element has a U-shaped profile; and the web of the second groove-section window glass element has a second flange extending along its second lateral edge, the second lateral edge of the web of the second groove-section window glass element is opposite to the first lateral edge of the web of the second groove-section window glass element, preferably wherein the second groove-section window glass element has a U-shaped profile; and the end of the first flange of the first groove-section window glass element faces the end of the first flange of the second groove-section window glass element, and the end of the second flange of the first groove-section window glass element faces the end of the second flange of the second groove-section window glass element.

[0049] Preferably, the first edge portion of the interior window glass element includes a first connecting portion, and the first connecting portion of the first edge portion of the interior window glass element is mechanically connected to the first flange of the first groove-section window glass element and the second groove-section window glass element, preferably wherein the first connecting portion of the first edge portion of the interior window glass element is attached to the first flange of the first groove-section window glass element and the second groove-section window glass element.

[0050] Preferably, the second edge portion of the interior window glass element includes a second connecting portion, and wherein the second connecting portion of the interior window glass element is mechanically connected to the second flange of the first groove section window glass element and the second groove section window glass element, preferably wherein the second connecting portion of the interior window glass element is attached to the second flange of the first groove section window glass element and the second groove section window glass element.

[0051] In some embodiments, the window glass also includes a third groove section window glass element, which includes a web and a first flange extending along its first lateral edge, and the window glass is arranged so that the first flange of the first groove section window glass element faces the web of the third groove section window glass element; the first flanges of the second groove section window glass element and the third groove section window glass element face the web of the first groove section window glass element, and wherein the first flange of the third groove section window glass element is located between the first flange of the first groove section window glass element and the first flange of the second groove section window glass element.

[0052] Preferably, the web of the first groove section window glass element has a second flange extending along its second lateral edge, the second lateral edge of the web of the first groove section window glass element is opposite to the first lateral edge of the web of the first groove section window glass element, more preferably wherein the first groove section window glass element has a U-shaped profile; and wherein the web of the second groove section window glass element has a second flange extending along its second lateral edge, the second lateral edge of the web of the second groove section window glass element is opposite to the first lateral edge of the web of the second groove section window glass element, more preferably wherein the second groove section window glass element has a U-shaped profile; wherein the second flange of the first groove section window glass element faces the web of the second groove section window glass element.

[0053] Preferably, the first edge portion of the interior window glass element comprises a first connection portion, wherein the first connection portion of the first edge portion of the interior window glass element is mechanically connected to the first flange of the second groove-section window glass element and / or the first flange of the third groove-section window glass element, preferably wherein the first connection portion of the first edge portion of the interior window glass element is attached to the first flange of the second groove-section window glass element and / or the first flange of the third groove-section window glass element.

[0054] Preferably, the window glass also includes a fourth groove section window glass element, which includes a web and a first flange extending along its first lateral edge, and the window glass is arranged so that the first flange of the fourth groove section window glass element faces the web of the second groove section window glass element; and wherein the first flange of the fourth groove section window glass element is located between the second flange of the first groove section window glass element and the second flange of the second groove section window glass element.

[0055] Preferably, the second edge portion of the interior window glass element includes a second connecting portion, and wherein the second connecting portion of the second edge portion of the interior window glass element is mechanically connected to the second flange of the first groove section window glass element and the second groove section window glass element, preferably wherein the second connecting portion of the second edge portion of the interior window glass element is attached to the second flange of the first groove section window glass element and the second groove section window glass element.

[0056] Preferably, the second connection portion of the second edge portion of the inner glazing element is in mechanical communication with the first flange of the fourth groove-section glazing element, preferably wherein the second connection portion of the second edge portion of the inner glazing element is attached to the first flange of the fourth groove-section glazing element.

[0057] Other embodiments have other preferred features.

[0058] Preferably, the first groove-section glazing element and / or the second groove-section glazing element comprises glass, more preferably glass having a soda-lime-silica glass composition.

[0059] Typical soda-lime-silica glass compositions are (by weight) SiO2 69-74%; Al2O3 0-3%; Na2O 10-16%; K2O 0-5%; MgO 0-6%; CaO 5-14%; SO3 0-2%; Fe2O3 0.005-2%. The glass may also contain other additives, such as refining aids, which are usually present in an amount of up to 2%.

[0060] When present, preferably the first connecting portion has a thickness of between 0.5 mm and 50 mm, more preferably between 0.5 mm and 40 mm, or 30 mm, or 20 mm, or 10 mm.

[0061] When present, preferably the second connecting portion has a thickness of between 0.5 mm and 50 mm, more preferably between 0.5 mm and 40 mm, or 30 mm, or 20 mm, or 10 mm.

[0062] In some embodiments, the first edge portion of the inner glazing element is bonded to the central portion of the inner glazing element by an adhesive.

[0063] Any suitable adhesive may be used. The adhesive may be a permanent adhesive or a re-adhesive adhesive.

[0064] The adhesive is preferably in sheet form or in liquid form prior to bonding the first edge portion of the interior glazing element to the central portion of the interior glazing element.

[0065] An example of an adhesive in sheet form is a double-sided tape.

[0066] It is most preferred that the adhesive is in liquid form prior to bonding.

[0067] Suitable adhesives include acrylic, anaerobic, cyanoacrylate and epoxy adhesives.

[0068] The adhesive may be a hot melt adhesive.If the adhesive is a hot melt adhesive, the temperature used to provide the hot melt adhesive is preferably below a temperature that may cause degradation, deformation or decomposition of the central portion and / or the first edge portion of the inner glazing element.

[0069] When the second edge portion is bonded to the central portion of the inner glazing element, adhesive bonding as just described may be used to bond the second edge portion to the central portion of the inner glazing element.

[0070] In some embodiments, the first edge portion of the inner glazing element is joined to the central portion of the inner glazing element by a mechanical fastener.

[0071] Suitable mechanical fasteners include hook and loop fasteners, such as Velcro type material.

[0072] When the second edge portion is joined to the central portion of the inner glazing element, a mechanical fastener as just described may be used to join the second edge portion to the central portion of the inner glazing element.

[0073] In some embodiments, the first edge portion of the interior glazing element is joined to the central portion of the interior glazing element by being fused with or to the central portion of the interior glazing element.

[0074] Preferably, the first edge portion of the interior glazing element is heat fused to or with the central portion of the interior glazing element.

[0075] In these embodiments, in order to bond the first edge portion of the interior window glass element to the central portion of the interior window glass element, the temperature of at least a portion of the first edge portion of the interior window glass element is increased to soften the first material, and the heat-softened portion of the first edge portion contacts the first side of the central portion of the interior window glass element to bond with or to the central portion of the interior window glass element.

[0076] In addition or alternatively, in order to bond a first edge portion of an interior window glass element to a central portion of an interior window glass element, the temperature of at least a portion of a first side of the central portion of the interior window glass element is increased to soften the second material, and the heat-softened portion of the central portion contacts the first edge portion to bond with or to the first edge portion.

[0077] If both the first edge portion and the central portion are heated to soften the first material and the second material for bonding, the heat-softened portions are preferably brought into contact with each other to enable bonding by fusion.

[0078] When the inner glazing element is made, for example by using an extrusion process, fusing of the first edge portion of the inner glazing element with the central portion of the inner glazing element may occur.

[0079] Thermal fusion can be achieved by welding.

[0080] When the second edge portion is bonded to the central portion of the interior window glass element, the second edge portion may be fused to or fused to the central portion of the interior window glass element, as just described with respect to the first edge portion of the interior window glass element being bonded to the central portion of the interior window glass element by being fused to or fused to the central portion of the interior window glass element.

[0081] In some embodiments, the first edge portion of the inner glazing element is joined to the central portion of the inner glazing element by being integrally formed with the central portion of the inner glazing element.

[0082] In such an embodiment, the inner glazing element is preferably formed by an extrusion process, wherein the central portion and the first edge portion are formed by extruding a first material through a first die and a second material through a second die.

[0083] The first mould and the second mould are preferably part of a mould assembly.

[0084] Preferably, the first material and the second material are co-extruded simultaneously.

[0085] Interior glazing elements formed by an extrusion process are referred to herein as extruded interior glazing elements.

[0086] A suitable extrusion process is described in US 4,884,616.

[0087] In these embodiments, preferably, the first edge portion of the interior window glass element is fused to or fused with the central portion of the interior window glass element, more preferably, wherein the first edge portion of the interior window glass element is heat-fused to or heat-fused to the central portion of the interior window glass element.

[0088] When the second edge portion is bonded to the central portion of the interior glazing element, the second edge portion may be integrally formed with the central portion of the interior glazing element in the same manner as just described when the first edge portion of the interior glazing element is integrally formed with the central portion of the interior glazing element. In particular, when the interior glazing element is extruded, the second edge portion of the interior glazing element is preferably fused with or fused to the central portion of the interior glazing element, more preferably wherein the second edge portion of the interior glazing element is heat fused with or heat fused to the central portion of the interior glazing element.

[0089] Preferably, the central portion is formed by extruding a first material through a first die, a second material through a second die, and a third material through a third die.

[0090] Preferably, the first material, the second material and the third material are co-extruded simultaneously.

[0091] In some embodiments, the first material is harder than the second material and / or the third material.

[0092] The relative hardness of the materials can be determined using standard techniques, for example, as defined in the ASTM D2240 Type A and Type D scales. Preferably, the hardness of the first material, the second material and the third material is determined using methods as defined in the ASTM D2240 Type A and Type D scales.

[0093] The hardness of a material can be measured using the known durometer scale.

[0094] Preferably, the first material has a first Shore A hardness and the second material has a second Shore A hardness, wherein the first Shore A hardness is greater than the second Shore A hardness.

[0095] Preferably, the first material has a first Shore A hardness and the third material has a third Shore A hardness, wherein the first Shore A hardness is greater than the third Shore A hardness.

[0096] Preferably, the first material has a first Shore A hardness, the second material has a second Shore A hardness, and the third material has a third Shore A hardness, wherein the first Shore A hardness is greater than the second Shore A hardness and the third Shore A hardness.

[0097] Preferably, the second material and / or the third material has a Shore A hardness of less than 120.

[0098] Preferably, the first material has a Shore A hardness greater than 50.

[0099] Preferably, the first material has a Shore D hardness greater than 50.

[0100] Preferably, the Shore A hardness of the second material and / or the third material is greater than 10.

[0101] Preferably, the first material has a Shore D hardness of less than 120.

[0102] In some embodiments, the second material and / or the third material includes polyvinyl chloride (PVC), ethylene vinyl acetate (EVA), polyester, polyolefin, elastomer, or polyurethane.

[0103] In some embodiments, the second material and / or the third material comprises an elastomer.

[0104] In some embodiments, the first material includes a thermoplastic.

[0105] In some embodiments, the first material includes polycarbonate, polyester, or acrylic.

[0106] A suitable polyester is polyethylene terephthalate (PET).

[0107] In some embodiments, the first material comprises a fibre bundle. Suitable fibres include glass fibres and / or synthetic fibres, and may be of the type used to provide fibrous insulation material, particularly fibrous wool material.

[0108] In some embodiments, the central portion of the inner glazing element comprises a fibre bundle. Suitable fibres include glass fibres and / or synthetic fibres, and may be of the type used to provide fibrous insulation material, particularly fibrous wool material.

[0109] In certain embodiments, the central portion of the inner glazing element comprises fibrous insulation. Suitable fibrous insulation materials include glass fibers and / or synthetic fibers.

[0110] Other embodiments have other preferred features.

[0111] Preferably, the web of the first groove-section glazing element has a second flange extending along its second lateral edge, the second lateral edge of the web of the first groove-section glazing element being opposite the first lateral edge of the web of the first groove-section glazing element. Preferably, both the first flange and the second flange of the first groove-section glazing element project away from the web in the same direction.

[0112] Preferably, the web of the second groove-section glazing element has a second flange extending along a second lateral edge thereof, the second lateral edge of the web of the second groove-section glazing element being opposite the first lateral edge of the web of the second groove-section glazing element. Preferably, both the first flange and the second flange of the second groove-section glazing element project away from the web in the same direction.

[0113] The web of the first groove-section glazing element has a first major surface and a second opposing major surface. Preferably, at least a portion of the first major surface and / or the second major surface of the web of the first groove-section glazing element has a coating thereon. Preferably, the coating is a low-emissivity coating. Preferably, the coating is a solar control coating.

[0114] The web of the second groove-section glazing element has a first major surface and a second opposed major surface. Preferably, at least a portion of the first major surface and / or the second major surface of the web of the second groove-section glazing element has a coating thereon. Preferably, the coating is a low-emissivity coating. Preferably, the coating is a solar control coating.

[0115] In a preferred embodiment of the glazing, the first groove-section glazing element and the second groove-section glazing element each comprise a web, a first flange and a second flange, the first flange extending along a first lateral edge of the respective web, the second flange extending along a second lateral edge of the respective web, the first lateral edge of the web being opposite the second lateral edge of the web, the first groove-section glazing element and the second groove-section glazing element being arranged such that the first flange of the first groove-section glazing element faces the first flange of the second groove-section glazing element, and the second flange of the first groove-section glazing element faces the second flange of the second groove-section glazing element. In this arrangement, preferably, the first flange of the first groove-section glazing element is coplanar with the first flange of the second groove-section glazing element, and the second flange of the first groove-section glazing element is coplanar with the second flange of the second groove-section glazing element.

[0116] Preferably, the inner glazing element extends between the first flange and the second flange of the first channel-section glazing element.

[0117] Preferably, the inner glazing element extends between the first flange and the second flange of the second channel-section glazing element.

[0118] Preferably, the first groove-section glazing element and the second groove-section glazing element are separated by a gap, and the inner glazing element is positioned in the gap.

[0119] In embodiments where the first groove-section glazing element has a first flange and a second flange, preferably the first flange of the second groove-section glazing element is received in a space between the first flange and the second flange of the first groove-section glazing element.

[0120] In some embodiments, the web of the first groove-section glazing element and / or the second groove-section glazing element is curved or corrugated, for example as in the groove-section glazing elements described in WO2008068324A1.

[0121] In some embodiments, the first channel-section glazing element is made of annealed glass rather than heat-tempered glass and the second channel-section glazing element is made of annealed glass rather than heat-tempered glass.

[0122] In other embodiments, the first channel-section glazing element is made of annealed glass rather than heat-tempered glass and the second channel-section glazing element is made of annealed glass rather than heat-tempered glass.

[0123] The glazing according to the first aspect of the invention has other preferred features.

[0124] Preferably, the central portion of the inner glazing element is monolithic.

[0125] Preferably, the first groove-section glazing element and / or the second groove-section glazing element is optically clear.

[0126] Preferably, the first groove-section glazing element and / or the second groove-section glazing element are laminated.

[0127] Preferably, the first groove-section glazing element and / or the second groove-section glazing element is coated on at least a portion thereof to provide the respective groove-section glazing element with an area having a different colour in reflected or transmitted light compared to an uncoated groove-section glazing element. Such a coating may be optically opaque. Suitably, the coating is a paint.

[0128] Preferably, the web of the first groove-section glazing element and / or the second groove-section glazing element has a thickness between 4 mm and 12 mm, more preferably between 5 mm and 8 mm.

[0129] Preferably, the or each flange of the first groove-section glazing element and / or the second groove-section glazing element has a thickness of between 4 mm and 12 mm, more preferably between 5 mm and 8 mm.

[0130] Preferably, the thickness of the web of the first groove-section glazing element is the same as the thickness of the or each flange of the first groove-section glazing element.

[0131] Preferably, the thickness of the web of the second groove-section glazing element is the same as the thickness of the or each flange of the first groove-section glazing element.

[0132] Suitable coatings that can be used for glazings according to the invention include low emissivity coatings, conductive coatings and solar control coatings. A low emissivity coating is one which, when applied to clear 3 mm thick float glass, results in the coated glass having an emissivity in the range of 0.05 to 0.45, actual values ​​being measured in accordance with EN 12898 (a published standard of the European Association of Flat Glass Manufacturers). Suitably, the low emissivity coating comprises at least one layer comprising tin oxide.

[0133] Typical solar control coatings include layers of silver or tin oxide and control the amount of heat absorbed by the coated glass. Solar control coatings and low-emissivity coatings can also be electrically conductive and thereby provide not only emissivity and heat transfer functionality to the glass but also form a conductive substrate for mounting conductive devices.

[0134] Such coatings may be applied using techniques known in the art, such as atmospheric pressure chemical vapor deposition or spray pyrolysis.

[0135] When the first groove-section glazing element and / or the second groove-section glazing element has two flanges, preferably the thickness of each flange is the same.

[0136] In embodiments where the interior glazing element has a central portion of multi-wall construction, preferably at least one of the walls of the central portion has a thickness of less than about 5 mm and / or greater than 0.05 mm. The thickness of at least one of the walls of the central portion may be between 0.5 mm and 3 mm.

[0137] In embodiments in which the first edge portion of the interior glazing element has a first connecting portion, preferably of multi-walled construction, preferably at least one of the walls of the first connecting portion has a thickness of less than about 5 mm and / or a thickness of more than 0.05 mm. The thickness of at least one of the first connecting portions may be between 0.5 mm and 3 mm.

[0138] In embodiments in which the second edge portion of the interior glazing element has a second connecting portion, preferably of multi-walled construction, preferably at least one of the walls of the second connecting portion has a thickness of less than about 5 mm and / or a thickness of more than 0.05 mm. The thickness of at least one of the first connecting portions may be between 0.5 mm and 3 mm.

[0139] In embodiments where the inner glazing element has a central portion which is preferably of multi-walled construction, preferably the central portion has a thickness of between 5 mm and 500 mm, or 400 mm, or 300 mm, or 200 mm, or 100 mm. The central portion may have fewer than 50 walls extending along a first axis, the first axis preferably being parallel to the web of the first groove-section glazing element and / or the second groove-section glazing element. The central portion preferably has a plurality of walls extending along a second axis, the second axis preferably being perpendicular to the web of the first groove-section glazing element and / or the second groove-section glazing element.

[0140] In embodiments wherein the first edge portion of the interior glazing element has a first connecting portion which is preferably of multi-walled construction, preferably the first connecting portion has a thickness of between 1 mm and 200 mm. The first connecting portion preferably has a plurality of walls extending along a first axis, the second axis being preferably perpendicular to the web of the first groove-section glazing element and / or the second groove-section glazing element. The first connecting portion preferably has a plurality of walls extending along a second axis, the second axis being preferably perpendicular to the web of the first groove-section glazing element and / or the second groove-section glazing element.

[0141] In embodiments wherein the second edge portion of the interior glazing element has a second connecting portion, preferably of multi-walled construction, preferably the second connecting portion has a thickness of between 1 mm and 200 mm. The second connecting portion preferably has a plurality of walls extending along a first axis, the second axis preferably being perpendicular to the web of the first groove-section glazing element and / or the second groove-section glazing element. The second connecting portion preferably has a plurality of walls extending along a second axis, the second axis preferably being perpendicular to the web of the first groove-section glazing element and / or the second groove-section glazing element.

[0142] In an embodiment in which the window glass is arranged so that there is a first space between the central portion of the inner window glass element and the web of the first groove section window glass element and a second space between the central portion of the inner window glass element and the web of the second groove section window glass element, the webs of the first groove section window glass element and the second groove section window glass element are separated by a spacing and the central portion has a thickness that is less than the spacing between the webs of the first groove section window glass element and the second groove section window glass element.

[0143] Preferably, the central portion has a thickness less than 90% of the spacing between the webs of the first groove section element and the second groove section element, more preferably less than 80%, or 70%, or 60%, or 50%, or 40%, or 30%, or 20%, or 10%, or 5% of the spacing between the webs of the first groove section element and the second groove section element.

[0144] Preferably, the central portion has a thickness of at least 2% or 3% or 4% of the spacing between the webs of the first and second trough-section elements.

[0145] Preferably, the central portion has a thickness between 0.5 cm and 50 cm, more preferably between 0.5 cm and 40 cm, or 30 cm, or 20 cm, or 10 cm, or 5 cm.

[0146] Glazing according to the invention may be retrofitted into an existing facade comprising a plurality of channel-section glazing elements.

[0147] The present invention also provides from a second aspect an internal window glass element for a window glass according to the first aspect of the present invention, the internal window glass element comprising: a central portion made of a first material; a first edge portion made of a second material and extending along a first side of the central portion; and a second edge portion made of a third material and extending along a second side of the central portion, the first side of the central portion being opposite to the second side of the central portion; wherein the first material is different from the second material, and further wherein the first edge portion of the internal window glass element is bonded to the central portion of the internal window glass element.

[0148] Preferably, the second edge portion of the inner glazing element is joined to the central portion of the inner glazing element.

[0149] Preferably, the third material is the same as the second material.

[0150] Preferably, the first material comprises polycarbonate, polyester or acrylic; or a fibre bundle.

[0151] Preferably, the central portion of the inner glazing element comprises the fibre bundles.

[0152] Preferably, the second material and / or the third material comprises polyvinyl chloride (PVC), ethylene vinyl acetate (EVA), polyester, polyolefin, elastomer or polyurethane.

[0153] Preferably, the first edge portion of the inner glazing element is joined to the central portion of the inner glazing element by being integrally formed with the central portion of the inner glazing element. In such an embodiment, the inner glazing element is preferably formed by an extrusion process, wherein the central portion and the first edge portion are formed by extruding a first material through a first die and a second material through a second die.

[0154] Preferably, the first edge portion of the inner glazing element is bonded to the central portion of the inner glazing element by adhesive or by mechanical fasteners.

[0155] In embodiments where the second edge portion of the inner glazing element is bonded to the central portion of the inner glazing element, the second edge portion may be integrally formed with the central portion of the inner glazing element. In such embodiments, the inner glazing element is preferably formed by an extrusion process, wherein the central portion, the first edge portion and the second edge portion are formed by extruding a first material through a first die, extruding a second material through a second die and extruding a third material through a third die.

[0156] Preferably, the first material, the second material and the third material are co-extruded simultaneously.

[0157] In embodiments wherein the second edge portion of the inner glazing element is bonded to the central portion, preferably the second edge portion of the inner glazing element is bonded to the central portion of the inner glazing element by an adhesive or by a mechanical fastener.

[0158] From a third aspect, the present invention provides a method for making an interior window glass element according to the second aspect of the present invention, the method comprising the following steps: (i) providing a first liquid for a first material; (ii) providing a second liquid for a second material; (iii) forming an extrudate by co-extruding the first liquid and the second liquid; wherein before step (iii), the first liquid is kept separate from the second liquid to prevent them from mixing; and wherein after step (iii), the extrudate is cooled to form the interior window glass element; further wherein the cooled second liquid forming the first edge portion of the interior window glass element is combined with the cooled first liquid forming the central portion of the interior window glass element.

[0159] Preferably, the method includes, before step (iii), a step of providing a third liquid for the third material; wherein during step (iii), the extrudate also includes some extruded third liquid; wherein before step (iii), the third liquid is kept separate from the first liquid and the second liquid to prevent them from mixing; and wherein after step (iii), the cooled third liquid forming the second edge portion of the interior window glass element is combined with the cooled first liquid forming the central portion of the interior window glass element.

[0160] Preferably, the first liquid comprises molten polycarbonate resin.

[0161] Preferably, the second liquid comprises molten polyvinyl chloride resin.

[0162] When a third liquid is used, preferably the third liquid is the same as the second liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0163] The invention will now be described with reference to the following drawings (not to scale), in which:

[0164] Figure 1 is an isometric view of a channel-section glazing element having only one flange continuous with the web;

[0165] Figure 2 is an isometric view of a channel-section glazing element having a web and two flanges continuous with the web;

[0166] Figure 3 is a front view of a portion of a facade for a building, the facade including four channel-section glazing elements;

[0167] Figure 4 is a cross-sectional view of a glazing according to the invention;

[0168] Figure 5 is a cross-sectional view of another glazing according to the present invention;

[0169] Figure 6 Yes Figure 5 a cross-sectional view of a facade of three window panes of the type shown in;

[0170] Figure 7 is a cross-sectional view of another glazing according to the present invention;

[0171] Figure 8 is a cross-sectional view of another glazing according to the present invention;

[0172] Fig. 9 is a cross-sectional view of another glazing according to the present invention;

[0173] Fig.10 is a cross-sectional view of another glazing according to the present invention;

[0174] Fig.11 Yes Fig.10 a cross-sectional view of a facade of three window panes of the type shown in;

[0175] Fig.12 is a cross-sectional view of another glazing according to the present invention;

[0176] Fig.13 is Fig.12 a cross-sectional view of an inner glazing element used in the construction of the glazing shown in;

[0177] Fig.14 is a cross-sectional view of another glazing according to the present invention;

[0178] Fig.15 is Fig.14 a cross-sectional view of an inner glazing element used in the construction of the glazing shown in;

[0179] Fig.16 is a cross-sectional view of another glazing according to the present invention;

[0180] Fig.17 is Fig.16 a cross-sectional view of an inner glazing element used in the construction of the glazing shown in;

[0181] Fig.18 is a plan view of an extrusion apparatus for making an interior glazing element for use in the glazing of the invention; and

[0182] Fig.19 yes Fig.18 Isometric drawing of the equipment shown in. DETAILED DESCRIPTION

[0183] Figure 1A schematic perspective view of a type of grooved section glazing element 2 which can be used to make a glazing according to the invention is shown. The grooved section glazing element 2 has a flange 2a and a web 2c formed integrally with the flange. The flange 2a is continuous with the web 2c and the grooved section glazing element 2 is bent from an initially flat glass sheet or ribbon, for example as described in DE 1496047 A1. The width 7 of the web can be a few centimeters, while the length 6 of the web can be tens of centimeters up to several meters.

[0184] The flange 2a has a first main surface 2d and an opposite second main surface 2e (not shown in the figure). The web 2c has a first main surface 2f and an opposite second main surface 2g (not shown in the figure).

[0185] The flange 2a is substantially perpendicular to the web 2c. In this example, the web 2c has a thickness of 7 mm and the flange 2a has a thickness of 7 mm.

[0186] With reference to the coordinate system shown, the web 2c is parallel to the plane xz. The flange 2a is parallel to the plane yz. When viewed along the z-axis, the channel-section glazing element 2 has an "L" shaped cross-sectional profile.

[0187] Figure 2 There is shown a schematic perspective view of another type of channel-section glazing element 12 that can be used to make glazing according to the invention.

[0188] The groove-section glazing element 12 has a first flange 12a, a second flange 12b and a web 12c. The flanges 12a, 12b are continuous with the web 12c (thus integrally formed), and the groove-section glazing element 12 is bent from an initially flat sheet or ribbon of glass, for example as described in DE 1496047 A1. The width 17 of the web may be a few centimeters, while the length 16 of the web may be several tens of centimeters up to several meters, for example 3m to 10m.

[0189] The first flange 12a has a first main surface 12d and an opposite second main surface 12e (not indicated in the figure). The second flange 12b has a first main surface 12h (not indicated in the figure) and an opposite second main surface 12i. The web 12c has a first main surface 12f and an opposite second main surface 12g (not indicated in the figure). The surface 12d of the first flange 12a faces the surface 12h of the second flange 12b.

[0190] The flanges 12a, 12b are each substantially perpendicular to the web 12c. In this example, the web 12c has a thickness of 7 mm and the flanges 12a, 12b each have a thickness of 7 mm.

[0191] With reference to the coordinate system shown, the web 12c is parallel to the plane xz. The flanges 12a, 12b are parallel to the plane yz. When viewed along the z-axis, the channel-section glazing element 12 has a "U" shaped cross-sectional profile.

[0192] The description of the channel-section glazing elements 2, 12 may be used in relation to the channel-section glazing elements described below.

[0193] Figure 3 A front view of a portion of a facade 9 for a building is shown, the facade comprising reference Figure 1 or Figure 2 Four groove section glazing elements of the type described. Figure 1 and Figure 2 , viewing the facade in the y-axis direction.

[0194] Each groove-section glazing element 2 or 12 is arranged vertically in a supporting or mounting frame (not shown) as known in the art.For each groove-section glazing element 2 or 12 in the facade, there may be a suitable sealant material between adjacent longitudinal edges.

[0195] The facade 9 may alternatively comprise horizontally oriented channel-section glazing elements.

[0196] Figure 4 A cross-sectional view of a window pane 21 according to the invention is shown. Figure 1 , which is the view in the z-axis direction.

[0197] The glazing 21 has a first groove-section glazing element 22 of annealed glass. The first groove-section glazing element 22 has a flange 22a and a web 22c. The flange 22a is continuous with the web 22c and the first groove-section glazing element is bent from an initially flat glass sheet or ribbon, for example as described in DE 1496047 A1.

[0198] The flange 22a is substantially perpendicular to the web 22c. The web 2c has a thickness of 7 mm. The flange 22a has a thickness of 7 mm.

[0199] The glazing 21 also has a second groove section glazing element 24 of annealed glass. The second groove section glazing element 24 has a flange 24a and a web 24c. The flange 24a is continuous with the web 24c, and the first groove section glazing element is bent from an initially flat glass sheet or ribbon, for example, as described in DE 1496047 A1.

[0200] The flange 24a is substantially perpendicular to the web 24c. The web 24c has a thickness of 7 mm. The flange 24a has a thickness of 7 mm.

[0201] The second groove-section glazing element 24 has substantially the same dimensions as the first groove-section glazing element 22 .

[0202] Both channel-section glazing elements 22, 24 are made of soda-lime-silica glass.

[0203] The first groove section glazing element and the second groove section glazing element are arranged so that the flange 22a of the first groove section glazing element face 22 faces the second groove section glazing element 24, and the flange 24a of the second groove section glazing element 24 faces the first groove section glazing element 22. In this arrangement, the interior facing surfaces of the groove section glazing elements 22, 24 define a cavity.

[0204] There may be a low emissivity coating on the surface of webs 22c and / or 24c facing into the cavity.

[0205] According to the invention, the window pane 21 comprises an inner window pane element 26 having a central portion 26a, a first edge portion 26b and a second edge portion 26c. The first edge portion 26b is bonded to the central portion 26a on a first side thereof, and the second edge portion 26c is bonded to the central portion on a second side thereof. The first side and the second side of the central portion are on opposite sides of the central portion.

[0206] The first edge portion 26b and the second edge portion 26c are heat fused to the central portion 26a. The central portion 26a is made of polycarbonate, which may be monolithic or multi-walled, and the first edge portion 26b and the second edge portion 26c are made of polyvinyl chloride.

[0207] The interior glazing element may be produced using a suitable extrusion process.

[0208] The first edge portion 26b contacts and is adjacent to the flange 22a. The second edge portion 26c contacts and is adjacent to the flange 24a.

[0209] The first edge portion 26b can be attached to the flange 22a, for example, by a suitable gasket on the upper end of the flange 22a and the first edge portion 26b. Alternatively or additionally, the first edge portion 26b can be attached to the flange 22a using a suitable adhesive. When an adhesive layer is used to attach the first edge portion 26b to the flange 22a, the adhesive layer is located between the flange 22a and the first edge portion 26b. Alternatively or additionally, the first edge portion 26b can be attached to the flange 22a by providing the first edge portion 26b with a first connecting portion, which is preferably engaged with the upper end of the flange 22a.

[0210] The second edge portion 26c can be attached to the flange 24a in a manner similar to the manner in which the first edge portion 26b is attached to the flange 22a, for example by means of a suitable gasket; and / or using a suitable adhesive; and / or by providing the second edge portion with a second connecting portion which preferably engages with the lower end of the flange 24a.

[0211] In this example, the interior glazing element 26 has an "H" shaped cross-sectional profile, but the central portion 26a may be inclined at an angle relative to the first and second edge portions 26b, 26c so that the interior glazing element has an "N" shaped profile that may be inverted laterally.

[0212] The inner glazing element 26 has a length that is the same or substantially the same as the length of the channel-section glazing elements 22, 24. The width of the inner glazing element 26 is substantially the same as the distance between the inner surfaces of the flanges 22a, 24a. The width of the inner glazing element 26 may be such that the inner glazing element fits snugly between the flanges 22a, 24a.

[0213] About Figure 4 In the orientation of the glazing 21 shown in FIG, there may be an upper space 27 between the web 24c and the central portion 26a of the inner glazing element, and there may be a lower space 28 between the central portion 26a of the inner glazing element and the web 22c.

[0214] The inner glazing element 26 divides the cavity defined by the inwardly facing surfaces of the channel-section glazing elements 22, 24 into two air spaces. This improves sound insulation. The glazing 21 also has improved thermal insulation (compared to the same arrangement without the inner glazing element 26).

[0215] The central portion 26a has a thickness of about 6 mm. The first edge portion 26b and the second edge portion 26c also have a thickness of about 6 mm.

[0216] The central portion 26a may be tinted to provide a tinted glazing 21. The surface of the central portion 26a may be provided with a coating, such as a solar control coating, to help further improve the thermal insulation properties of the glazing 21.

[0217] Figure 5 A cross-sectional view of another glazing 51 according to the first aspect of the invention is shown. Figure 2 , which is the view in the z-axis direction.

[0218] The glazing 51 has a first groove section glazing element 52 having a first flange 52a, a second flange 52b and a web 52c. The flanges 52a, 52b are continuous with the web 52c and the first groove section glazing element has been bent from an initially flat glass sheet or ribbon, for example as described in DE 1496047 A1.

[0219] The glazing 51 also has a second groove section glazing element 54 having a first flange 54a, a second flange 54b and a web 54c. The first groove section glazing element 52 has the same dimensions as the second groove section glazing element 54. This is advantageous because the first groove section glazing element and the second groove section glazing element can be manufactured during the same production run.

[0220] The first groove section glazing element and the second groove section glazing element are arranged so that the flange 54a faces the web 52c and the first flange 54a is between the flanges 52a, 52b. The outer surface of the flange 54a is spaced from the inner surface of the flange 52a by a sufficient amount so that the flange of the other glazing element can be located therebetween (as shown in FIG. Figure 6 described).

[0221] Because the first and second groove-section glazing elements are of the same size and because flange 52a is spaced from flange 54a, flange 52b is spaced from flange 54b. The space between the outer surface of flange 52b and the inner surface of flange 54b is sufficient to allow the flange of an adjacent glazing to be located therebetween.

[0222] The inner surfaces of the flanges 54a, 52b and portions of the inner surfaces of the webs 52c, 54c define a cavity in which is located an inner glazing element 56. The inner glazing element 56 is located between the first 52 and second 54 groove section glazing elements.

[0223] The inner window glass element 56 is similar to the reference Figure 4 The interior window glass 26 is described. The interior window glass element has a central portion 56a, a first edge portion 56b, and a second edge portion 56c. The first edge portion 56b is bonded to the central portion 56a along a first side of the central portion. The second edge portion 56c is bonded to the central portion 56a along a second side of the central portion, and the second side of the central portion 56a is along a lateral edge of the central portion 56a opposite the first side of the central portion 56a.

[0224] The first edge portion 56b and the second edge portion 56c are thermally fused to the central portion 56a. The central portion 56a is made of polycarbonate, and the first edge portion 56b and the second edge portion 56c are made of polyvinyl chloride (PVC).

[0225] The inner glazing element 56 may be fabricated using a suitable extrusion process.

[0226] In an alternative embodiment, at least one of the first edge portion 56b and the second edge portion 56c is bonded to a corresponding edge of the central portion 56a using a suitable adhesive.

[0227] The central portion 56a of the inner glazing element 56 is located between the web 52c and the web 54c. An upper space 57 exists between the web 54c and the central portion 56a of the inner glazing element 56. A lower space 58 exists between the central portion 56a of the inner glazing element 56 and the web 52c.

[0228] The interior glazing element 56 is located between the second flange 52b of the first groove section glazing element 52 and the first flange 54a of the second groove section glazing element 54. Thus, the second edge portion 56c of the interior glazing element 56 is adjacent to the flange 54a and the first edge portion 56b of the interior glazing element is adjacent to the flange 52b.

[0229] A low-emissivity or solar control coating may be present on the surface of the webs 52c, 54c facing away from the central portion 56a of the inner glazing element 56.

[0230] The low-E coating may include tin oxide.

[0231] The central portion 56a of the inner glazing element 56 has a first major surface facing the web 54c and a second major surface facing the web 52c. A low emissivity coating or solar control coating may be present on either of these surfaces.

[0232] The central portion 56a and / or any one of the first connecting portion 56b and the second connecting portion 56c may have a multi-wall structure. Such a structure helps to improve thermal insulation.

[0233] The central portion 56a may be colored so that light passing through the central portion 56a is absorbed in at least one wavelength in the 380-780 nm region so that the transmitted light has a different color from the incident light.

[0234] Figure 6 A cross-sectional view of a portion of a facade 49 is shown including a plurality of window panes 51. Each window pane 51 is positioned adjacent to another window pane 51. To aid in describing Figure 6 , three window glasses 51, 51* and 51** are highlighted. Each window glass 51, 51* and 51* is Figure 5, and therefore each component of the glazing 51* and 51** will be referenced in the same manner as the glazing 51 except that "*" or "**" is added after each component, respectively. For example, the glazing 51 has a first groove section glazing element 52, and the first groove section glazing element has a first flange 52a. Thus, the glazing 51* has a first groove section glazing element 52*, and the first groove section glazing element has a first flange 52a*, and so on. Similarly, the glazing 51** has a first groove section glazing element 52**, and the first groove section glazing element has a first flange 52a**, and so on.

[0235] When the window glass is installed to make the facade 49, the second flange 54b* of the window glass 51* is fitted into the space between the first flange 52a and the first flange 54a of the window glass 51 so that the flange 52a faces the web 54c* of the second groove section window glass element 54* of the window glass 51*. Thus, the flange 54b* of the second groove section window glass element 54* of the window glass 51* faces the web 52c of the first groove section window glass element 52 of the window glass 51.

[0236] like Figure 6 As shown in FIG. 1 , the second flange 54b** of the window glass 51** fits into the space between the first flange 52a* and the first flange 54a* of the window glass 51** so that the flange 52a* faces the web 54c** of the second groove section window glass element 54** of the window glass 51**. Thus, the flange 54b** of the second groove section window glass element 54** of the window glass 51** faces the web 52c* of the first groove section window glass element 52* of the window glass 51**.

[0237] The window panes 51 forming the facade 49 may be oriented vertically or horizontally.

[0238] For each glazing 51 in the facade there may be a suitable sealant material between adjacent longitudinal edges.

[0239] like Figure 6 As shown, the web 52c of each first groove section glazing element 52 of each respective glazing 51 forms the outer surface of the facade, i.e. the surface facing the exterior of the building to which the facade is installed. The inwardly facing surface is formed by the web 54c of the second groove section glazing element 54 of each respective glazing 51.

[0240] Since each window glass 51 includes an inner window glass unit (as shown in reference Figure 5 The facade has improved thermal performance. The thermal performance may be further improved by including a low emissivity coating on the first groove section glazing element and / or the second groove section glazing element.

[0241] Each interior glazing element 56 , 56 * and / or 56 ** may be the same or different.

[0242] Figure 7 Another glazing 101 according to the present invention is shown. Glazing 101 comprises a first groove section glazing element 102 and a second groove section glazing element 104. Each groove section glazing element 102, 104 is a reference Figure 2 The type of description.

[0243] The channel-section glazing element 102 has a web 102c having a first flange 102a and a second flange 102b at its lateral edges.

[0244] The channel-section glazing element 104 has a web 104c having a first flange 104a and a second flange 104b at its lateral edges.

[0245] The channel-section glazing elements 102, 104 have substantially the same dimensions.

[0246] The window glass 101 is arranged so that the end of the first flange 102a faces the end of the first flange 104a and the end of the second flange 102b faces the end of the second flange 104b.

[0247] The inwardly facing surfaces of the channel-section glazing elements 102, 104 define a cavity. The cavity is divided into two air spaces 107, 109 by an inner glazing element 106 located in the cavity.

[0248] An interior glazing element 106 is located between the channel-section glazing elements 102 , 104 .

[0249] The inner glazing element 106 has a central portion 106a, a first edge portion 106b and a second edge portion 106c.

[0250] In this example, the central portion 106a is of multi-wall construction and is made of polycarbonate. The first edge portion 106b is bonded to the central portion 106a along a first lateral edge of the central portion. The second edge portion 106c is bonded to the central portion 106a along a second lateral edge of the central portion, the second lateral edge being opposite the first lateral edge.

[0251] The first edge portion 106b and the second edge portion 106c are both made of elastomer, and preferred elastomers are silicone rubber, ethylene propylene diene monomer (EPDM) and chloroprene rubber.

[0252] The first edge portion 106b has an "H" shaped cross-sectional profile and is configured so that the ends of the flanges 102a, 104a engage therewith. The flanges 102a, 104a can fit snugly with the first edge portion 106b. The flanges 102a, 104a are attached to the first edge portion 106b. Such first edge portion 106b has a first connection portion and a second connection portion, the first connection portion of the first edge portion 106b engages with the flange 102a, and the second connection portion of the first edge portion 106b engages with the flange 104a.

[0253] The second edge portion 106c is configured in the same manner as the first edge portion 106b and is configured to be attached to the flanges 102b, 104b. The second edge portion 106c has a first connection portion and a second connection portion, the first connection portion of the second edge portion 106c is engaged with the flange 102b, and the second connection portion of the second edge portion 106c is engaged with the flange 104b.

[0254] Assuming that the two channel-section glazing elements 102, 104 have substantially the same dimensions, the central portion 106a is located equidistantly between the webs 102c, 104c. The two air spaces 107, 109 therefore have the same volume. The central portion 106a may have a thickness of between 5 mm and 50 mm.

[0255] The first edge portion 106b and / or the second edge portion 106c may be adhesively bonded to the central portion 106a.

[0256] The first edge portion 106b and / or the second edge portion 106c may be fused with or to the central portion 106a.

[0257] like Figure 7 , it may be desirable to position the central portion 106a at another location within the cavity. Figure 8 and Fig. 9 Shown in.

[0258] exist Figure 7 In an alternative embodiment to the illustrated embodiment, the central portion is a fibrous insulation material having a thickness of approximately 10 cm, although the thickness may be such as to completely fill the cavity defined by the first and second groove-section glazing elements 102, 104; or the thickness may be less than 10 cm.

[0259] Figure 8 Another window glass 111 according to the present invention is shown. The window glass 111 comprises the same Figure 7The same groove cross-section glazing elements 102, 104 as described for the glazing 101. The interior glazing element 106' is used to position the central portion 106a' at a different position in the cavity. The central portion 106a' is arranged to be positioned between the flanges 104a, 104b because the central portion is not intermediate between the first edge portion 106b' and the second edge portion 106c'. In this example, the first edge portion 106b' and the second edge portion 106c' do not include corresponding connecting portions. The first edge portion 106b' and the second edge portion 106c' are joined to the central portion along their opposite lateral edges.

[0260] The central portion 106a' comprises polycarbonate in a monolithic form or in a multi-walled form. The first edge portion 106b' and the second edge portion 106c' are made of polyvinyl chloride or a suitable elastomer.

[0261] Fig. 9 Glazing 111' is shown which is identical to glazing 111 except that an interior glazing element 106" is positioned in the cavity defined by channel-section glazing elements 102, 104. Interior glazing element 106 has a central portion 106a", a first edge portion 106b" and a second edge portion 106c".

[0262] The central portion 106a" is made of polycarbonate. The first edge portion 106b" and the second edge portion 106c" are both made of polyvinyl chloride, although in alternative embodiments, the first connecting portion 106b" is made of a different material than the second connecting portion 106c". For example, the first edge portion 106b" can be made of EPDM or neoprene, and the second edge portion 106c" can be made of polyvinyl chloride.

[0263] The first edge portion 106b" has a first connecting portion 107 formed integrally therewith. The first connecting portion 107 is made of the same material as the first edge portion 106b". The first connecting portion 107 has a "T"-shaped profile in cross-section, and extends away from the first edge portion 106b" to define a first space or slot into which the end of the flange 102b can fit and a second space or slot into which the end of the flange 104b can fit. This connects the flanges 102b, 104b to the first edge portion 106b". The end of the flange 102b can fit snugly in the first space, and the end of the flange 104b can fit snugly in the second space.

[0264] Similarly, the second edge portion 106c" has a second connecting portion 109 formed integrally therewith. The second connecting portion 109 is made of the same material as the second edge portion 106c". The second connecting portion 109 has a "T"-shaped profile and extends away from the second edge portion 106c" to define a first space or slot into which the end of the flange 102a can fit and a second space or slot into which the end of the flange 104a can fit. This connects the flanges 102a, 104a to the second edge portion 106c". The end of the flange 102a can fit snugly in the first space defined by one side of the second connecting portion 109 and the second edge portion 106c". The end of the flange 104b can fit snugly in the second space defined by the other side of the second connecting portion 109 and the second edge portion 106c".

[0265] In an alternative embodiment, the first connecting portion 107 is made of a different material than the first edge portion 106b'". In such an embodiment, the first connecting portion 107 can be bonded to the first edge portion 106b'. The manner of bonding can be performed as discussed with respect to bonding the first edge portion to the central bond.

[0266] In an alternative embodiment, the second connection portion 109 is made of a different material than the second edge portion 106c'". In such an embodiment, the second connection portion 109 may be bonded to the second edge portion 106b".

[0267] The materials of the first connection portion 107 and the second connection portion 109 may be the same or different.

[0268] Fig.10 A cross-sectional view of another window pane 131 according to the present invention is shown. Figure 2 , which is a view in the z-axis direction. The window glass 131 is similar to Figure 5 Window glass51.

[0269] The glazing 131 has a first groove section glazing element 132 having a first flange 132a, a second flange 132b and a web 132c. The flanges 132a, 132b are continuous with the web 132c and the first groove section glazing element has been bent from an initially flat sheet or ribbon of glass, for example as described in DE 1496047 A1.

[0270] The glazing 131 also has a second groove section glazing element 134 having a first flange 134a, a second flange 134b and a web 134c. The first groove section glazing element 132 has the same dimensions as the second groove section glazing element 134. This is advantageous because the first groove section glazing element and the second groove section glazing element can be manufactured during the same production run.

[0271] The first groove-section glazing element 132 and the second groove-section glazing element 134 are each as described with respect to Figure 2 The type being described.

[0272] The first and second groove section glazing elements 132, 134 are arranged so that the first flange 134a faces the web 132c and is received in the space between the flanges 132a, 132b. The flanges 132a, 134a are sufficiently spaced apart so that a flange of another glazing may be located therebetween.

[0273] Because first and second groove-section glazing elements 132, 134 are of the same size and because flange 132a is spaced from flange 134a, flange 132b is spaced from flange 134b sufficiently that the flange of an adjacent glazing may be located therebetween.

[0274] The inner surfaces of the flanges 134a, 132b and portions of the inner surfaces of the webs 132c, 134c define a cavity in which the inner glazing element 133 is located. The inner glazing element 133 is located between the first trough section glazing element 132 and the second trough section glazing element 134.

[0275] The interior window glass element 133 has a central portion 133a made of polycarbonate and having a multi-walled construction. Along a first lateral edge of the central portion 133a, a first edge portion 133b is bonded to the first lateral edge of the central portion. Along a second lateral edge of the central portion 133a, a second edge portion 133c is bonded to the second lateral edge of the central portion. The first lateral edge or side of the central portion 133a is opposite to the second lateral edge or side of the central portion. The first edge portion 133b and the second edge portion 133c are each made of polyvinyl chloride or an elastomer.

[0276] Each of the first edge portion 133b and the second edge portion 133c has an "L" shaped cross-sectional profile. A portion of the first edge portion 133b is positioned between the end of the flange 132b and the web 134c. By having the first edge portion made of polyvinyl chloride and by being bonded to the central portion 133a of the inner window glass element 133, it is no longer necessary to have a separate gasket on the end of the flange 132b. This simplifies assembly and reduces costs because one less component is required.

[0277] Similarly, a portion of the second edge portion 133c is positioned between the end of the flange 134a and the web 132c. By having the second edge portion made of polyvinyl chloride and by being bonded to the central portion 133a of the inner glazing element 133, it is no longer necessary to have a separate gasket on the end of the flange 134a.

[0278] Furthermore, since the first edge portion 133 b and the second edge portion 133 c are coupled to the central portion 133 a , their positions are properly maintained by the support provided by the central portion 133 a .

[0279] The multi-walled central portion 133a helps to improve the thermal insulation properties of the window glass 131.

[0280] There is an upper space 137 between the web 134c and the central portion 133a. There is a lower space 138 between the central portion 133a and the web 132c.

[0281] There may be a low emissivity coating or solar control coating on the surface of the webs 132c, 134c that faces the central portion 133a.

[0282] There may be a low emissivity coating or solar control coating on the surface of the webs 132c, 134c facing away from the central portion 133a.

[0283] The low-E coating may include tin oxide.

[0284] There may be a solar control coating on web 132c and / or web 134c. There may be a solar control coating on web 132c and / or web 134c. There may be a solar control coating on web 132c and / or web 134c. There may be a solar control coating on web 132c and there may be a solar control coating on web 134c.

[0285] In this example, the central portion 133a has a multi-wall configuration including multiple walls extending horizontally and vertically to define multiple air spaces. Other arrangements of the walls are possible, for example as a honeycomb.

[0286] There may be a coating on the outer wall of the central portion 133a, such as a low emissivity coating and / or a solar control coating and / or a coating that provides a color to the central portion.

[0287] The first edge portion 133 b and the second edge portion 133 c have a single-wall configuration.

[0288] Fig.11 Shown includes multiple Fig.10 A cross-sectional view of a facade 141 of a window pane 131 of the type shown in . Each window pane 131 is positioned adjacent to another window pane 131.

[0289] To help describe Fig.10 , three window glasses 131, 131* and 131** are highlighted. Each window glass 131, 131* and 131** is Fig.10 Therefore, each component of the window glasses 131* and 131** will be referenced in the same manner as the window glass 131, except that "*" or "**" is added after each component, respectively.

[0290] When the window glass is installed to make the facade 141, the second flange 134b* of the window glass 131* is fitted into the space between the flange 132a and the flange 134a of the window glass 131, so that the flange 132a faces the web 134c* of the second groove-section window glass element 134* of the window glass 131*.

[0291] Thus, the flange 134b* of the second groove-section glazing element 134* of the glazing 131* faces the web 132c of the first groove-section glazing element 132 of the glazing 131*.

[0292] The window panes 131 forming the facade 141 may be oriented vertically or horizontally.

[0293] For each window pane 131 , 131 *, 131 ** etc. in the facade, there may be a suitable sealant material between adjacent longitudinal edges.

[0294] refer to Fig.10 and Fig.11 In the space between the first flange 134a of the groove-section glazing element 134 and the first flange 132a of the groove-section glazing element 132 is the second flange 134b* of the groove-section glazing element 134*.

[0295] The second edge portion 133c of the inner glazing element 133 is positioned between the ends of the first and second flanges 134a, 134b* and the web 132c.

[0296] The first edge portion 133 b is configured in the same manner and is shown between the ends of the flanges 132 b , 132 a ** and the web 134 .

[0297] Since the first and second edge portions 133b, 133c are made of PVC, there is no need to have gaskets or the like on the ends of the flanges 134a, 134b* and 132a**, 132b. The relatively soft first and second edge portions 133b, 133c provide a means of cushioning the ends of the flanges against the respective webs during vibrations, for example due to wind blowing in front of the facade 141. The first and second edge portions 133b, 133c also locate the central portion 133a in the correct position in the cavity formed by the two channel-section glazing elements 132, 134.

[0298] In reference Fig.10 and Fig.11 In an alternative to the embodiment shown in , the first edge portion 133b and the second edge portion 133c each have a respective end portion for providing a respective connecting portion.

[0299] In this alternative embodiment, the first connecting portion extends partially down flange 132a** toward web 132c** and is positioned between flange 132a** and flange 134b.

[0300] The second connection portion between the flanges 132a, 134b* extends upwardly along the flange 134b* portion toward the web 134c*.

[0301] The first connecting portion helps attach the first edge portion 133b to the flange 132b, 132a**, and the second connecting portion helps attach the second edge portion 133c to the flange 134a, 134b*.

[0302] The first connection portion may be integrally formed with the first edge portion 133b. The second connection portion may be integrally formed with the second edge portion 133c.

[0303] Fig.12 Shown with Fig.10 A cross-sectional view of another window glass 151 similar to the window glass 131 shown in FIG, except that a different inner window glass element 153 is used. Fig.13 The inner glazing element 153 is shown separately in FIG.

[0304] refer to Fig.12 and Fig.13, the inner window glass member 153 includes a central portion 153a, a first edge portion 153b, and a second edge portion 153c. The first edge portion 153b and the second edge portion 153c are coupled to the central portion 153a by being integrally formed with the central portion.

[0305] The central portion 153a is made of polycarbonate, and the first edge portion 153b and the second edge portion 153c are made of polyvinyl chloride.

[0306] The central portion 153a includes a first vertical member 154a, a second vertical member 154b, a first inclined member 154c, and a second inclined member 154d. Each of the members 154a, 154b, 154c, and 154d is substantially sheet-shaped, although they may have a multi-wall configuration.

[0307] The first and second sloping members 154c, 154d intersect at region 154e, forming an "X" in the cross-sectional profile.

[0308] The first vertical member 154a is coupled to the second edge portion 153c at a lower end portion, and is coupled to an upper end portion of the first inclined member 154c at an opposite upper end portion thereof.

[0309] The second vertical member 154b is coupled to the first edge portion 153b at an upper end portion, and is coupled to a lower end portion of the first inclined member 154c at an opposite lower end portion thereof.

[0310] The second inclined member 154d is coupled at a lower end portion thereof to a lower end portion of the first vertical member 154a, and is coupled at an upper end portion thereof to an upper end portion of the second vertical member 154b.

[0311] The central portion 153a may be integrally formed by an extrusion process.

[0312] The first edge portion 153b has an "L"-shaped portion (in an "L" shape in cross section) 155a extending away from the upper end of the second vertical member 154b. At one end, the "L"-shaped portion 155a is coupled to the upper end of the second vertical member 154b. At the second end, the "L"-shaped portion 155a has a first connecting portion 155b extending downwardly, which is substantially parallel to the second vertical member 154b. The first connecting portion 155b is integrally formed with the "L"-shaped portion 155a.

[0313] The second edge portion 153c has an "L"-shaped portion (also, L"-shaped in cross section) 156a extending away from the lower end of the first vertical member 154a. At one end, the "L"-shaped portion 156a is joined to the lower end of the first vertical member 154a. At the second end, the "L"-shaped portion 156a has a first connecting portion 156b extending upwardly and substantially parallel to the first vertical member 154a. The first connecting portion 156b is integrally formed with the "L"-shaped portion 156a.

[0314] like Fig.12 As shown in , the window glass 151 is arranged so that the first edge portion 153b is located between the upper ends of the two flanges of the adjacent groove section window glass element (one is the groove section window glass element 132) and the web of the groove section window glass element 134; and the second edge portion 153c is located between the lower ends of the two flanges of the adjacent groove section window glass element (one is the groove section window glass element 134) and the web of the groove section window glass element 132. The first connecting portions 155b, 156b of the respective first and second edge portions help to connect the inner window glass element 153 to the ends of the flanges, as shown in FIG. Fig.12 as shown in .

[0315] Fig.14 Shown with Fig.10 A cross-sectional view of another window glass 161 similar to the window glass 131 shown in FIG. 1, except that a different inner window glass element 163 is used. Fig.15 The inner glazing element 163 is shown separately in FIG.

[0316] refer to Fig.14 and Fig.15 , the inner window glass element 163 includes a central portion 163a, a first edge portion 163b and a second edge portion 163c. The first edge portion 163b and the second edge portion 163c are bonded to the central portion by being integrally formed with the central portion 163a, which have been formed by an extrusion process.

[0317] The central portion 163a is made of polycarbonate, and the first edge portion 163b and the second edge portion 163c are made of polyvinyl chloride.

[0318] The central portion 163a includes a first vertical member 164a and a second vertical member 164b. Between the first vertical member 164a and the second vertical member 164b are a plurality of inclined members (three in this example) arranged in a zigzag manner. That is, the upper end of the inclined member 164c is connected to the upper end of the first vertical member 164a, and the lower end of the inclined member 164c is connected to the lower end of the inclined member 164d. The upper end of the inclined member 164d is connected to the upper end of the inclined member 164e. The lower end of the inclined member 164e is connected to the lower end of the second vertical member 164b.

[0319] A lower end portion of the first vertical member 164a is coupled to the second edge portion 163c.

[0320] An upper end portion of the second vertical member 164b is coupled to the first edge portion 163b.

[0321] The cross-sections of the first edge portion 163b and the second edge portion 163c are substantially "L"-shaped.

[0322] Each of the members 164a, 164b, 164c, 164d, and 164e are substantially sheet-like, although they may have a multi-wall configuration.

[0323] exist Fig.14 and Fig.15 In the alternative embodiment shown in , the first edge portion 163b and the second edge portion 163c are bonded to the central portion 163a by an adhesive. In such an embodiment, the central portion 163a can be formed by an extrusion process. The first edge portion 163b and / or the second edge portion 163c can also be formed by an extrusion process.

[0324] Fig.16 Shown with Fig.10 A cross-sectional view of another window glass 171 similar to the window glass 131 shown in FIG, except that a different inner window glass element 173 is used. Fig.17 The inner glazing element 173 is shown separately in FIG.

[0325] refer to Fig.16 and Fig.17 , the inner window glass element 173 includes a central portion 173a, a first edge portion 173b and a second edge portion 173c. The first edge portion 173b and the second edge portion 173c are bonded to the central portion 173a by being integrally formed with the central portion, which have been formed by an extrusion process.

[0326] The central portion 173a is made of polycarbonate or other suitable plastic, and the first edge portion 173b and the second edge portion 173c are made of PVC or an elastomer.

[0327] The central portion 173a includes a first slanted member 174a and a second slanted member 174b. The first slanted member 174a and the second slanted member 174b have an intersection at 174e, which forms an element having an "X" shaped cross-sectional profile.

[0328] The first edge portion 173b is coupled to an upper end portion of the first slanting member 174a.

[0329] The second edge portion 173c is coupled to a lower end portion of the first inclined member 174a.

[0330] The cross-sections of the first edge portion 173b and the second edge portion 173c are substantially "L"-shaped.

[0331] Each of the first and second slanted members 174a and 174b is substantially sheet-shaped, although they may have a multi-wall configuration.

[0332] The second angled member 174b has a lower end and an upper end. The lower end is configured to rest against the intersection between the web 132c and the flange 132b of the groove section glazing element 132. The upper end is configured to rest against the intersection between the web 134c and the flange 134a of the groove section glazing element 134.

[0333] At the lower end of the second angled member 174 b is a first hollow portion 174 c configured to absorb and / or cushion any vibrations applied to the window glass 171 between the interior window glass element 173 and the groove-section window glass element 132 .

[0334] At the upper end of the second sloping member 174 b is a second hollow portion 174 d which is also configured to absorb and / or cushion any vibrations applied to the window glass 171 between the interior window glass element 173 and the groove-section window glass element 134 .

[0335] In an alternative embodiment, the second inclined member 174b has a hollow portion only at one end thereof.

[0336] In another alternative embodiment, the second slanted member 174b does not have a hollow portion at either end thereof.

[0337] exist Fig.16 and Fig.17In the alternative embodiment shown in FIG. 1 , the first edge portion 173b and the second edge portion 173c are bonded to the central portion 173a by an adhesive and are not integrally formed with the central portion.

[0338] In the foregoing examples, the central portion may be optically transparent or translucent. The central portion of the interior glazing element may be tinted to provide a transmissive color when viewed through it. At least a portion of the central portion may be coated, such as with a low emissivity coating or a solar control coating. The coating may be used to provide color to the central portion, such as a coating that may be an optically opaque coating or allow light to be transmitted therethrough.

[0339] Fig.18 There is shown a schematic plan view of an extrusion apparatus 400 for making an inner glazing element for use in a glazing according to the first aspect of the invention. Fig.19 A schematic isometric view of an extrusion apparatus 400 is shown.

[0340] refer to Fig.18 and Fig.19 , the extrusion apparatus 400 includes a first chamber 402 and a second chamber 404 downstream thereof. The first chamber 402 is divided into three internal chambers 406, 408 and 410. Each of the internal chambers 406, 408, 410 has a corresponding inlet 412, 414, 416 for supplying a suitable liquid material to the corresponding internal chamber. The liquid flowing into each internal chamber can flow out of the corresponding outlet to enter the second chamber 404. The second chamber 404 regulates the material extruded through the outlets in the internal chambers 406, 408, 410. The cooled and solidified inner window glass element then comes out of the outlet in the lead-out end of the second chamber 404.

[0341] Each interior chamber may have a suitably configured pump or hydraulic system to force liquid in the respective interior chamber through an outlet in the respective interior chamber.

[0342] The first interior chamber 406 has an inlet 412 and an outlet 418 .

[0343] The second interior chamber 408 has an inlet 414 and an outlet 420 .

[0344] The third interior chamber 410 has an inlet 416 and an outlet 422 .

[0345] In this example, the outlet 418 of the first interior chamber 406 is configured in an "L" shape. The outlet 420 of the second interior chamber 408 is also configured in an "L" shape, but rotated approximately 180° compared to the outlet 418. The two outlets 418, 420 are connected by a rectangular outlet 422 in the third interior chamber 410.

[0346] In the first chamber 402, the three internal chambers 406, 408, 410 are configured to not allow any liquids in the internal chambers 406, 408, 410 to mix. Mixing is possible at the interface between adjacent outlets. For example, when the first liquid is drawn from the outlet 418 and the second liquid is drawn from the outlet 422, mixing is possible at the interface between the outlets 418 and 422. Fig.18 This is illustrated by dashed line 424.

[0347] Similarly, when the third liquid is drawn from outlet 420 and the second liquid is drawn from outlet 422, mixing is possible at the interface between outlets 420 and 422. Fig.18 This is illustrated by dashed line 426.

[0348] When the respective liquid in the respective internal chamber is drawn out from the respective outlet, its viscosity is sufficient for extrusion.A suitable heating mechanism, such as an electric strip heater, may be provided in each internal chamber to allow the appropriate temperature of the internal liquid to be achieved.

[0349] The extruded inner glazing element 430 passes through the second chamber 404 and exits an outlet 432 therein having become sufficiently cooled and dimensionally stable.

[0350] Due to the arrangement of outlets 418, 420, and 422, as the liquid in each respective internal chamber passes through the respective outlet, slight mixing may occur at interface regions 424, 426, so that the liquid extruded from outlet 418, after cooling, fuses with the liquid extruded from outlet 422, after cooling. Likewise, the liquid extruded from outlet 420, after cooling, fuses with the liquid extruded from outlet 422, after cooling.

[0351] The resulting extruded interior glazing element has a central portion 440, a first edge portion 442, and a second edge portion 444. The first edge portion 442 is bonded to the central portion 440 along a first side of the central portion due to fusion of liquids that occur after the liquids used to make the first edge portion and the central portion flow from respective outlets 418, 422. The second edge portion 444 is bonded to the central portion 440 along a second side of the central portion, the second side being opposite the first side, due to fusion of liquids that occur after the liquids used to make the second edge portion and the central portion flow from respective outlets 420, 422.

[0352] By varying the shape of outlets 418, 420 and 422, different interior glazing elements having different cross-sectional profiles may be produced.

[0353] Suitable liquids for use in the extrusion apparatus 400 include molten polyvinyl chloride resin and molten polycarbonate resin.

[0354] The inner glazing element 430 is made according to the following process.

[0355] The molten polyvinyl chloride resin 433 is provided to the first internal chamber 406 via the inlet 412. The molten polyvinyl chloride resin 435 is provided to the second internal chamber 408 via the inlet 414. The molten polycarbonate resin 437 is provided to the third internal chamber 410 via the inlet 416.

[0356] The molten resin passes through the respective chambers to be discharged therefrom via the respective outlets 418, 420, 422. On one side, the molten polyvinyl chloride resin 433 discharged from the outlet 418 in the first internal chamber 406 fuses with the molten polycarbonate resin 437 discharged from the outlet 422 in the third internal chamber. On the opposite side, the molten polyvinyl chloride resin 435 discharged from the outlet 420 in the second internal chamber 408 fuses with the molten polycarbonate resin 437 discharged from the outlet 422 in the third internal chamber.

[0357] The hot extrudate 430' in the second chamber 404 may not be able to maintain its own shape and therefore may be supported on a suitable guide former (not shown) positioned in the second chamber 404. When the hot extrudate in the second chamber 404 is cooled, for example using cooling air from a fan, the cooled extrudate becomes sufficiently rigid so that it can be transported on a suitable conveying system, which may include a plurality of conveying rollers to convey the interior glazing element 430 away from the extrusion device in the direction of arrow 446.

[0358] The inner glazing element 430 may be cut to suitable lengths for making glazings according to the invention.

[0359] By using an extrusion process to make the inner glazing element 430 , the first edge portion 442 and the second edge portion 444 are integrally formed with the central portion 440 .

[0360] Similar extrusion equipment and processes are described in US 4,884,616.

[0361] Suitable colorants may be added to the liquid used to form the extruded interior glazing element.Once extruded, the central portion 440 may be provided with a coating, such as a solar control coating, paint or coating, on one or both major surfaces thereof to provide the central portion with a tinted color in transmission.

[0362] Such a coating may be provided before or after the interior glazing element is cut to length suitable for inclusion in a glazing according to the invention.

[0363] The present invention provides a glazing having an internal glazing element incorporated between a first groove section glazing element and a second groove section glazing element to improve thermal performance. By using an internal glazing element wherein at least one edge portion thereof is bonded to a central portion of the internal glazing element, construction time is facilitated to be reduced. Furthermore, no separate components are required and therefore inventory costs and storage requirements may also be reduced. The material of the central portion may be selected to provide a glazing having improved thermal performance, while the first edge portion may be selected to provide desired properties to that portion of the internal glazing element, in particular to aid connection to one or more flanges of the groove section glazing element used to form the glazing.

[0364] Thus, a glazing comprising a first groove section glazing element and a second groove section glazing element is described. The first groove section glazing element and the second groove section glazing element are arranged to define a cavity in which an interior glazing element is located.

[0365] The interior glazing element comprises a central portion made of a first material, a first edge portion made of a second material and extending along a first side of the central portion, and a second edge portion made of a third material and extending along a second side of the central portion. The first material is different from the second material, and the first edge portion is bonded to the central portion of the interior glazing element and is preferably integrally formed with the central portion. In a preferred embodiment, the second edge portion is also bonded to the central portion and is preferably integrally formed with the central portion. A method of making the interior glazing element is also described.

Claims

1. A window glass, comprising: a first groove-section glazing element and a second groove-section glazing element, each of the first groove-section glazing element and the second groove-section glazing element comprising a web and a first flange, the first flange extending along a first lateral edge of the respective web, the first groove-section glazing element and the second groove-section glazing element being arranged such that an end of the first flange of the first groove-section glazing element faces toward the second groove-section glazing element, and an end of the first flange of the second groove-section glazing element faces toward the first groove-section glazing element, wherein at least a portion of the interior glazing element is located between the web of the first groove-section glazing element and the web of the second groove-section glazing element, The interior glazing element comprises: a central portion, the central portion being made of a first material, a first edge portion made of a second material and extending along a first side of the central portion; and a second edge portion, the second edge portion being made of a third material and extending along a second side of the central portion, The first side of the central portion is opposite to the second side of the central portion; wherein the first material is different from the second material and Also wherein the first edge portion of the inner glazing element is joined to a central portion of the inner glazing element.

2. The window glass according to claim 1, wherein The second edge portion of the inner glazing element is joined to the central portion of the inner glazing element.

3. The window glass according to claim 2, wherein: The second edge portion of the interior glazing element is bonded to the central portion of the interior glazing element by being integrally formed with the central portion of the interior glazing element; or wherein the second edge portion of the interior glazing element is bonded to the central portion of the interior glazing element by an adhesive, preferably a permanent adhesive or a re-adhesive adhesive; or by a mechanical fastener, preferably a hook and loop fastener.

4. The window glass according to any one of claims 1 to 3, wherein: The third material is the same as the second material.

5. A window glass according to any of the preceding claims, wherein the central part of the internal window glass element fills the space between the web of the first groove-section window glass element and the web of the second groove-section window glass element; or wherein the central part of the internal window glass element is configured so that a first space exists between the central part of the internal window glass element and the web of the first groove-section window glass element and / or a second space exists between the central part of the internal window glass element and the web of the second groove-section window glass element.

6. A window glass according to any one of the preceding claims, wherein the central portion of the inner window glass element has a multi-wall construction, the multi-wall construction comprising a first wall facing the web of the first groove-section window glass element and a second wall facing the web of the second groove-section window glass element, a plurality of air spaces being present between the first wall and the second wall of the central portion of the inner window glass element; and / or wherein the central portion of the inner window glass element comprises fibrous insulation material.

7. A glazing according to any one of the preceding claims, wherein: The web of the first groove-section glazing element has a second flange extending along its second lateral edge, the second lateral edge of the web of the first groove-section glazing element being opposite to the first lateral edge of the web of the first groove-section glazing element, preferably wherein the first groove-section glazing element has a U-shaped profile.

8. A glazing according to any one of the preceding claims, wherein: The web of the second groove-section glazing element has a second flange extending along its second lateral edge, the second lateral edge of the web of the second groove-section glazing element being opposite to the first lateral edge of the web of the second groove-section glazing element, preferably wherein the second groove-section glazing element has a U-shaped profile.

9. A window glass according to any one of the preceding claims, wherein the first flanges of the first groove-section window glass element and the second groove-section window glass element each have a corresponding first end opposite to their corresponding webs; the window glass is arranged so that the first end of the first flange of the first groove-section window glass element faces the first end of the first flange of the second groove-section window glass element; and the web of the first groove-section window glass element has a second flange extending along its second lateral edge, the second lateral edge of the web of the first groove-section window glass element being opposite to the first lateral edge of the web of the first groove-section window glass element; and the web of the second groove-section window glass element has a second flange extending along its second lateral edge, the second lateral edge of the web of the second groove-section window glass element being opposite to the first lateral edge of the web of the second groove-section window glass element; the end of the first flange of the first groove-section window glass element faces the end of the first flange of the second groove-section window glass element, and the end of the second flange of the first groove-section window glass element faces the end of the second flange of the second groove-section window glass element.

10. A glazing as claimed in any preceding claim, wherein the first edge portion of the inner glazing element is joined to the central portion of the inner glazing element by being integrally moulded with the central portion of the inner glazing element.

11. A window glass according to any one of the preceding claims, wherein the first edge portion of the interior window glass element is joined to the central portion of the interior window glass element by fusing with or fusing to the central portion of the interior window glass element, preferably wherein the first edge portion of the interior window glass element is heat-fused with or heat-fused to the central portion of the interior window glass element.

12. A glazing according to claim 10 or claim 11, wherein: The interior glazing element is an extruded interior glazing element.

13. A glazing according to any one of claims 1 to 9, wherein the first edge portion of the inner glazing element is bonded to the central portion of the inner glazing element by an adhesive, preferably a permanent adhesive or a re-adhesive adhesive; or by a mechanical fastener, preferably a hook and loop fastener.

14. A window glass according to any of the preceding claims, wherein the first material is harder than the second material and / or the third material, preferably wherein the first material has a first Shore hardness A, the second material has a second Shore hardness A, and the third material has a third Shore hardness A, and further wherein the first Shore hardness A is greater than the second Shore hardness A and / or the third Shore hardness A.

15. A glazing according to any preceding claim, wherein the second and / or third material has a Shore A hardness of less than 120.

16. A glazing as claimed in any preceding claim in which the first material has a Shore A hardness of greater than 50.

17. A glazing according to any preceding claim, wherein: The first material includes a thermoplastic.

18. A glazing according to any preceding claim wherein the first material comprises polycarbonate, polyester or acrylic; or wherein the first material comprises fibre bundles.

19. A glazing according to any preceding claim, wherein the second material and / or the third material comprises polyvinyl chloride (PVC), ethylene vinyl acetate (EVA), polyester, polyolefin, elastomer or polyurethane.

20. An interior glazing element for a glazing according to any preceding claim, the interior glazing element comprising: a central portion, the central portion being made of a first material, a first edge portion made of a second material and extending along a first side of the central portion; as well as a second edge portion, the second edge portion being made of a third material and extending along a second side of the central portion, the first side of the central portion being opposite to the second side of the central portion, wherein the first material is different from the second material, and Also wherein the first edge portion of the inner glazing element is joined to a central portion of the inner glazing element.

21. An interior glazing element as claimed in claim 20, wherein the second edge portion of the interior glazing element is bonded to the central portion of the interior glazing element.

22. An interior glazing element according to claim 21, wherein The second edge portion of the inner glazing element is bonded to the central portion of the inner glazing element by being integrally formed with the central portion of the inner glazing element, or wherein the second edge portion of the inner glazing element is bonded to the central portion of the inner glazing element by an adhesive or by a mechanical fastener.

23. An interior window glass element according to any one of claims 19 to 22, wherein the first edge portion of the interior window glass element is bonded to the central portion of the interior window glass element by being integrally formed with the central portion of the interior window glass element; or wherein the first edge portion of the interior window glass element is bonded to the central portion of the interior window glass element by an adhesive or by a mechanical fastener.

24. An interior glazing element according to any one of claims 20 to 23, wherein the third material is the same as the second material.

25. An interior glazing element according to any one of claims 20 to 24, wherein the first material comprises polycarbonate, polyester, acrylic or fiber bundle; and / or wherein the second material and / or the third material comprises polyvinyl chloride (PVC), ethylene vinyl acetate copolymer (EVA), polyester, polyolefin, elastomer or polyurethane.

26. A method of making an interior glazing element according to any one of claims 20 to 25, the method comprising the steps of: (i) providing a first liquid for a first material; (ii) providing a second liquid for a second material; (iii) forming an extrudate by coextruding the first liquid and the second liquid; wherein before step (iii), the first liquid and the second liquid are kept separate to prevent them from mixing; and wherein after step (iii), the extrudate is cooled to form the inner glazing element; and further wherein the cooled second liquid forming the first edge portion of the inner glazing element is joined to the cooled first liquid forming the central portion of the inner glazing element.

27. The method according to claim 26, comprising the step of providing a third liquid for the third material before step (iii); wherein during step (iii), the extrudate further comprises some extruded third liquid; wherein before step (iii), the third liquid is kept separate from the first liquid and the second liquid to prevent them from mixing; And wherein after step (iii), the cooled third liquid forming the second edge portion of the inner glazing element is joined to the cooled first liquid forming the central portion of the inner glazing element.

28. A method according to claim 26 or claim 27, wherein the first liquid comprises molten polycarbonate resin and / or wherein the second liquid comprises molten polyvinyl chloride resin.

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