Multiple layer window glazing and method for manufacturing the same

Abstract

The present invention relates to a multiple layer glazing comprising a transparent first outer layer, a transparent second outer layer, a narrower transparent third inner layer positioned between the outer layers, a transparent adhesive foil layer positioned between the first outer layer and the third inner layer, and a seal surrounding the third inner layer. The present invention also provides a laminated glazing core incorporated into such multiple layer glazing and a method for making such multiple layer glazing.

Description

[Technical Field]

[0001] The present invention relates to a multiple layer glazing comprising a transparent first outer layer, a second outer layer, and a thinner and narrower transparent third inner layer. The invention also relates to a thin laminated glazing core incorporated into the multiple layer glazing and to a method for making the multiple layer glazing. [Background technology]

[0002] Multi-pane windows are used for their strength, thermal and / or acoustic insulation. Vacuum insulated glass also incorporates a vacuum space between the two glass layers, as the vacuum reduces temperature and / or vibration transmission between the glass layers due to little or no conduction and convection. Furthermore, by incorporating at least one internal transparent low-emittance or other infrared-reflective coating, radiant heat transfer can be reduced to low levels.

[0003] Among other things, a durable glass unit is known from US Pat. No. 5,629,799, which discloses a glass unit having a first outer glass sheet, an inner glass sheet, and an interlayer therebetween, the inner glass sheet being narrower than the outer glass sheet, a second glass sheet spaced apart from the first glass sheet and sealed thereto, a gas space being provided between the first and second glass sheets, and a spacer being located between the first and second glass sheets, the spacer being bonded to the first and second glass sheets by a primary seal and a secondary seal bonding the first glass sheet to the second glass sheet.

[0004] Such multiple glazings offer strength and good insulation values, but have a relatively heavy weight, which is not a problem for glazing in buildings. On the other hand, multiple glazings for automotive applications have additional requirements: in addition to the requirement for high scores for strength, thermal insulation, and sound insulation, they also have a limited weight. This becomes more urgent with the electrification of cars and buses by using batteries, and the need to limit the energy consumption of environmental controls using battery capacity. Therefore, there is an increasing demand for energy-saving glazings, and available insulation glazings are not suitable for use in changing positions, such as vehicles going up and down mountain roads. The object of the present invention is to provide a multiple glazing that meets these requirements, and a method for manufacturing such a multiple glazing. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] US Patent Application Publication No. 2017 / 0028686 Summary of the Invention

[0006] The present invention provides a multiple layer glazing comprising a transparent first outer layer, a transparent second outer layer, a narrower transparent third inner layer positioned between the outer layers so that the transparent outer layer overhangs the third inner layer on all sides, a transparent adhesive foil layer positioned between the first outer layer and the third inner layer and connecting the third inner layer to the first outer layer over the entire surface of the third inner layer, and a seal surrounding the third inner layer and hermetically connecting the contour boundaries of the outer layers, each outer layer having a thickness at least twice, preferably at least three times, the thickness of the third inner layer, and further comprising spacers distributed over the entire surface of the third inner layer facing the second outer layer. In such multiple layer glazing, the thin or ultra-thin inner layer is fully protected by the relatively robust outer layer and the surrounding seal, thereby reducing its vulnerability. The third inner layer contributes substantially to the insulation properties of the multiple layer glazing while contributing little to the weight of the structure. The adhesive transparent foil layer that adheres the third inner layer to the first outer layer over its entire surface also provides a structure that can handle the differential expansion that occurs in glass panels of different thicknesses, as well as the relatively high temperature differences between the panels (resulting from the thermal insulation properties of the multiple glazing). The seal surrounding the (thinner) third inner layer also provides some space to compensate for the differential expansion of the outer layer relative to the inner layer. Because temperature differences across the multiple glazing can be significant (due to the high thermal insulation properties of the glazing of the present invention) and the expansion of the layers of various thicknesses can also be relatively significant, the glazing is designed to handle such differential expansion.

[0007] Furthermore, the spacers are distributed and therefore contact the entire side of the third inner layer at spaced locations. This provides well-distributed internal support for the structure and prevents uncontrolled localized loads on the surface of the third inner layer, a feature that also contributes to a compact and robust structure. A further advantageous effect of the compact size is that the high strength and high cut-off value allow the use of multiple layer glazings that are not thick in total, which is particularly advantageous in automotive applications of multiple layer glazings according to the invention. As will be explained below, multiple layer glazings according to the invention also allow for relatively simple manufacturing methods. The adhesive transparent foil layer may help to provide a shard safety feature, which may retain some (or at least most) of the resulting shards in the event of fracture of the outer and / or inner layers in contact with the foil layer.

[0008] Preferably, the seal does not directly contact the contour boundary of the first outer layer, but contacts the adhesive transparent foil layer between the seal and the first outer layer, so that the seal and the adhesive transparent foil layer fuse / fuse together, which further enhances the sealing quality of the multiple glazing.

[0009] The claim language "outline boundary of the outer layer" refers to the periphery of the outer layer. Furthermore, the word "layer" can also be read as "sheet," and "transparent" should be considered as being transparent to at least a large portion of light radiation (ultraviolet, visible, and / or infrared). Regarding spacers, they may be attached to the surface of the third inner layer, but they may also be attached to the surface of a layer adjacent (contacting) the third inner layer, such as the (inside of) the second outer layer. Since some thermoplastic elastomers do not crosslink, crosslinking can also be interpreted as being completely laminated.

[0010] The present invention also provides a multiple layer glazing, further comprising a thinner and narrower transparent fourth inner layer positioned between the third inner layer and the second outer layer, and a second adhesive transparent foil layer positioned between the fourth inner layer and the second outer layer and connecting the fourth inner layer to the second outer layer over the entire surface of the fourth inner layer, wherein the thickness of each outer layer is at least twice, and preferably at least three times, the thickness of each inner layer, the outer layers overhanging the inner layers on all sides, and a seal surrounding both inner layers and hermetically connecting the contour boundaries of the outer layers. Here, the single (third) inner layer is made double by adding another (fourth) inner layer and a second adhesive foil layer to adhere the additional (fourth) inner layer to the transparent second outer layer over its entire surface. In this alternative multiple layer glazing of the present invention, the double inner layer package (together with a spacer between the two (third and fourth) inner layers) is completely encapsulated by the two adhesive transparent foil layers and the seal around the inner layers. Preferably, the seal contacts portions of both adhesive transparent foil layers that overhang the periphery of the inner layer, allowing the seal and both adhesive transparent foil layers to fuse / weld during the manufacturing process. This also adds to the sealing qualities of the multiple layer glazing. This double inner layer structure is well suited to absorbing stresses due to expansion and provides good insulation because the "core" of the multiple layer glazing is fully encapsulated by the double adhesive transparent foil layers and the seal. A further advantage is that such a double inner layer "core," two foil layers, and seal can be manufactured as a semi-finished product that is embedded between two outer layers at a later time and / or elsewhere, thereby providing substantial additional logistics possibilities. This double inner layer "core" without the outer layers is also part of the present invention, as described below. Another advantage is that the double adhesive transparent foil layer will retain any shards from the two outer and two inner layers, thereby helping to provide a shard-safe structure. Regarding the size of the narrower transparent fourth inner layer, this "narrower size" refers to the two outer layers, and the transparent outer layer also preferably extends further than the fourth inner layer on all sides. The size of the fourth inner layer can be comparable or identical to the size of the third inner layer.With respect to the thickness of each of the outer layers, in practice (and preferably) this thickness is at least twice the thickness of each of the inner layers.

[0011] In the multiple glazing according to the invention, the spacer may provide a free space adjacent to the third inner layer, which free space is hermetically isolated from the outside air. The spacer thus separates the third inner layer from the second outer layer, or, if in a laminate, from the fourth inner layer. The pressure in the free space around the spacer may be low, which may be below atmospheric pressure or less than 0.01 bar, preferably less than 1×10 -5 This means that the free space is less than 100 bar. This free space, which is preferably low or very low pressure, enhances the insulating properties of the multiple glazing. To maintain such a low pressure in the free space and / or to prevent contaminants from entering the free space, the free space is hermetically isolated from the outside air by seals, possibly in combination with a foil layer fused to the seals. Multiple glazing with a low free space pressure is also called "vacuum insulated glass" (VIG).

[0012] The transparent foil layer and / or the seal may be made of a thermoplastic elastomer, such as polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), or an adhesive copolymer such as thermoplastic polyurethane (TPU). The advantages of such thermoplastic elastomers are that they are easy to use in the manufacturing process and they bond irreversibly at a certain temperature, whether by crosslinking or not, to provide irreversible sealing properties.

[0013] The multiple glazing according to the invention may be flat or may have a curved shape, and in particular multiple glazing for vehicles has many different applications, for example when considering the complex shapes of vehicle windows.

[0014] In embodiments, at least one inner layer has a thickness of less than 2.1 mm, but preferably the inner layer thickness is less than 1 mm, more preferably in the range of 0.3 to 0.7 mm. Due to the rigidity of the first and second outer layers (at least twice, but preferably at least three times, the thickness of the inner layers), the inner layers can be made very thin. Potential differential expansion is captured by the construction of the multi-layer glazing according to the invention, incorporating the seals and adhesive transparent foil layer. For rigidity, the outer layers have a thickness of at least, but preferably greater than, 1 mm.

[0015] The spacers may be attached to the third inner layer, the second outer layer (if only a single inner layer is used), and / or the fourth inner layer (if two inner layers are used). In embodiments, the spacers are printed on at least one layer, although the spacers may also be embodied as glass elements attached to at least one layer. The glazing layers may conventionally be comprised of glass and / or tempered glass, although alternatively, other transparent materials, such as plastic materials, may be used for one or more of the multiple layers.

[0016] The present invention also provides a thin-laminated window glass core for incorporation into a multiple glazing according to the present invention, comprising at least two transparent laminated inner layers, a spacer separating the two inner layers to provide a free space between the two laminated inner layers, a seal surrounding the two laminated inner layers, leaving a breathable connection to the outside air, and two transparent foil layers covering the outside of both inner layers and at least partially covering the seal, the inner layers, spacer, seal, and foil layers being mechanically joined by the breathable connection to the outside air of the free space between the two laminated inner layers. In the field of multiple glazing according to the present invention, such a window glass core is embedded, with at least one inner layer having a thickness of less than 2.1 mm, preferably less than 1 mm, more preferably in the range of 0.3 to 0.7 mm. The two inner layers may be conventionally made of glass and / or tempered glass. Such a thin-laminated window glass core may be manufactured at a different location and time from the manufacturing of the multiple glazing according to the present invention. This provides a significant logistical advantage.

[0017] At least one of the surrounding seals and / or transparent foil layers may consist of a thermoplastic elastomer that has been pre-bonded in a not fully crosslinked or uncrosslinked state. Furthermore, the surrounding seals and / or transparent foil layers may have a pre-bonded profiled surface. In the pre-bonded state, the thermoplastic material is preferably not yet crosslinked (or at least not fully crosslinked) so that the bonding properties of the surrounding seals and / or transparent foil layers can be used for assembly of the finished product in the final production of the multiple glazing according to the invention. This can be achieved, for example, by pre-heating the thermoplastic elastomer, for example, to 50°C (or 30-70°C) to provide some mechanical strength for the relative positioning of the seals, foil layers, and third and fourth inner layers (the final bonding, whether crosslinked or not, is usually carried out at a higher temperature level, between 90°C and 130°C). On the other hand, it is important to maintain a breathable connection to the outside air of the free space between the two laminated inner layers (so that the seals do not have to seal the free space at this stage) so that this free space can be evacuated during the manufacture of the final multi-layer panel according to the invention. The advantage is that the semi-finished laminated glazing core is not brittle before final manufacture, leaving room for choice as to with what pressure (and possibly with what filler gas) the free space between the inner glass layers is closed.

[0018] The surrounding seals and / or transparent foil layers may have pre-bonded profiled surfaces to enhance gas exchange with the free space between the inner layers during final manufacturing of the multi-layer panel. Such profiled surfaces may facilitate gas exchange with the free space between the inner layers during manufacturing of the final multi-layer panel. The seals and / or transparent foil layers may be spot welded to provide mechanical coherence to the laminated glazing core.

[0019] The present invention also provides a method for manufacturing a multiple layer glazing according to the present invention, in which two laminated outer layers, at least one inner layer, a spacer, at least one transparent intermediate foil layer, and a seal are joined together by heating and pressurizing the laminate, and the free space provided by the spacer adjacent to the third inner layer is subjected to a low atmospheric pressure, followed by airtight isolation from the outside air. The pressure that bonds the at least one inner layer and the intermediate foil layer to the corresponding outer layer is maintained at or below the pressure difference between the environmental pressure level and the low-pressure level of the free space, unless the intermediate foil layer is curved. This method can reduce optical distortion due to deformation of the multiple layer glazing. After the multiple layer glazing according to the present invention is manufactured, a constant force due to atmospheric pressure is applied to the spacer via the outer and inner layers. This force can cause the layers to locally bend around the spacer, forming a spherical shape in one or more of the layers. Such deformations ("wobbles") result in optical distortion and a loss of mechanical strength of the multiple layer glazing due to permanent internal stresses. The present multilayer structure of the glazing provides additional strength, thus reducing this unwanted deformation. On the other hand, during the production of a multiple glazing according to the invention, at least one foil layer will be deformed because this layer(s) becomes viscous or liquid when heated during the production process, and due to local pressure loads at the locations where the spacers are located, the viscous / liquid foil layer material will partially flow out locally until the pressure difference in the foil layer is somewhat equalized. This will lead to deformation in the final foil layer and to stronger optical distortions. The solution according to the invention is to reduce the pressure on the spacer when the foil layer viscosity is low, i.e., when the foil layer has been heated but not yet crosslinked. Thus, atmospheric pressure will only pressurize the spacer in a multiple glazing according to the invention after the foil layer material has at least partially hardened, connecting at least one inner and outer layer.

[0020] Thus, after cooling and / or cross-linking of the foil layer material, the foil material and the thinner inner layer together form one more solid element, providing significantly greater strength than the individual material layers and maintaining a more uniform thickness of all layers.

[0021] In a specific embodiment of the method according to the invention, the method comprises the following successive method steps: a) thermally adhering at least one inner layer together with a transparent intermediate foil layer to an outer layer until the intermediate foil layer is at least partially crosslinked, b) laminating the pretreated inner layer / intermediate foil / outer layer partial laminate with at least one additional outer layer and a seal, c) placing the laminate resulting from method step b) in a low-pressure environment while applying heat and pressure to the laminate, wherein gas is applied from the free space during the treatment step, and d) sealing the free space with a seal to unite all layers of the multiple glazing. In a specific embodiment of the method, during treatment step a), two inner layers, each with a transparent intermediate foil layer, are adhered to a corresponding outer layer until both intermediate foil layers are at least partially crosslinked, and during treatment step b), both pretreated inner layer / intermediate foil / outer layer partial laminates can be laminated together with an intermediate seal. In these methods, one or two solid combinations of outer, foil, and inner layers are first produced before the final multi-layer laminate of the complete window pane is made, and thus the foil layer material is cured before the finished product is manufactured.

[0022] Alternatively, the method according to the present invention comprises the following steps: e) placing the laminated two outer layers, at least one inner layer, a spacer, at least one transparent intermediate foil layer, and a seal in a low-pressure environment, thereby creating a low-pressure level in the free space; f) sealing the free space; g) increasing the external pressure on the laminated package to a medium-pressure level between the low-pressure level used in method step e) and the ambient pressure, and heating the laminated package until the laminated package is consolidated and the at least one intermediate foil layer is hardened; and h) increasing the pressure on the consolidated laminate to the ambient pressure level. For example, the low-pressure level can be 0-0.1 bar (to create a near-vacuum in the free space), and the medium-pressure level can be in the range of 0.15-0.7 bar. In these alternative methods, the pressure for consolidating all layers of the multiple pane is maintained at a lower level until the foil material is at least partially hardened. These methods also prevent or at least limit deformation of sticky and liquid (= soft) foil material.

[0023] In yet a further embodiment of the method, the pressure for consolidating all layers of the multiple layer glazing is maintained at a lower level until the foil material is at least partially cured before laminating the outer and inner layers, seals and at least one transparent foil layer according to method step f), and the thinned window glass core according to the invention is (previously) produced as a semi-finished product, with the thinned window glass core according to method step f) incorporated as part of the laminated outer and inner layers, seals and at least one transparent foil layer. As mentioned above, producing the window glass core as a semi-finished product offers substantial logistical advantages. In order to provide some integrity in such a thinned window glass core, the window glass core can be heated to below 65°C, preferably below 55°C, before the window glass core of method step f) can be incorporated as part of the laminated outer and inner layers, seals and at least one transparent foil layer. This provides, for example, the option of manufacturing the thinned window glass core as a semi-finished product at a location different from where the successive method steps f) to h) are performed.

[0024] The spacers are typically attached to the layers (preferably the inner layers) before the layers are laminated, although alternatively the spacers may be placed after partial lamination of some of the layers.

[0025] In a specific embodiment of the method, at least a portion of the manufacturing process is carried out in an autoclave. An autoclave is a device used to carry out industrial processes that require temperatures and pressures higher or lower than atmospheric pressure / temperature. The application of heat and pressure to the laminated two outer layers, at least one inner layer, spacer, at least one intermediate transparent foil layer, and seals to unite the laminate and provide a negative pressure in free space can be achieved in an autoclave. The laminated material is placed in an air-impermeable sack, which is connected to a gas extractor. By extracting gas from the sack (and allowing gas / air to re-enter the sack), the pressure on the laminate can be varied in a well-controlled manner.

[0026] The invention will be further explained on the basis of non-limiting exemplary embodiments shown in the following drawings. [Brief explanation of the drawings]

[0027] [Figure 1A] 1 is a cross-sectional view of a multiple glazing component according to the present invention having a single inner layer prior to assembly; FIG. [Figure 1B] 1B is a cross-sectional view of the components of the multiple glazing according to FIG. 1A after assembly; [Figure 2A] FIG. 2 is a cross-sectional view of an alternative embodiment multiple glazing component according to the present invention having two inner layers prior to assembly. [Figure 2B] 1C is a cross-sectional view of the components of the multiple glazing according to FIG. 1B after assembly; FIG. [Figure 3] FIG. 1 is a cross-sectional view of the outer layer, foil layer, and inner layer assembled with a spacer. [Figure 4] 1 is a cross-sectional view of a laminated window glass core according to the present invention after assembly; [Figure 5] 1 is a side view of a vehicle window glass according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] FIG. 1A shows a cross-section of the individual components of a multiple pane 1 according to the invention, comprising a transparent first outer layer 2, a transparent second outer layer 3, and a narrower transparent third inner layer 4 located between the outer layers 2 and 3. It can also be seen that the outer layers 2 and 3 extend beyond the third inner layer 4 on all sides. A self-adhesive transparent foil layer 5 is provided between the first outer layer 2 and the third inner layer 4. A seal 6 surrounds the third inner layer 4. The thicknesses D1 and D2 of the outer layers 2 and 3 are at least twice the thickness D3 of the third inner layer 4. Spacers 8 facing the second outer layer 3 are distributed over the entire surface 7 of the third inner layer 4. In FIG. 1A, the components are not yet assembled.

[0029] In Figure 1B, the components shown in Figure 1A are now assembled (integrated) into a multiple glazing 1 according to the invention. An adhesive transparent foil layer 5 connects the third inner layer 4 and the first outer layer 2, and a seal 6 connects the outer layers 2, 3 (together with the adhesive transparent foil layer 5), where the seal 6 is further fused to the foil layer 5. Around the spacer 8 there is a free space 9 that is sealed from the environment 10 by the seal 6 and the foil layer 5. In this free space 9 the gas pressure is preferably lower than the atmospheric pressure in the environment (more preferably close to a vacuum).

[0030] Figure 2A shows a cross-sectional view of the components of an alternative embodiment of a multiple glazing 11 before assembly, where components corresponding to identical components of the multiple glazing 1 shown in Figures 1A and 1B have the same reference numerals. In contrast to the glazing 1 according to Figures 1A and 1B, the multiple glazing 11 has two inner layers 4 , 12, i.e., the third inner layer (described above) 4 , and an additional fourth inner layer 12. An additional adhesive transparent foil layer 13 is disposed between the fourth inner layer 12 and the second outer layer 3. The fourth inner layer 12 is narrower than the outer layers 2 and 3. Fourth inner layer 12 The thickness D4 of the third inner layer 4 is less than half the thicknesses D1 and D2 of the outer layers 2 and 3, and is more or less the same as the thickness D3 of the third inner layer 4.

[0031] In Figure 2B, the components shown in Figure 2A are now assembled (integrated) into a multiple glazing 1 according to the invention. An adhesive transparent foil layer 13 connects the fourth inner layer 12 and the second outer layer 3, and a seal 6 connects the outer layers 2, 3 (together with adhesive transparent foil layers 5, 13). Again, the seal 6 connects both foil layers 5, 13 The free space 9 around the spacer 8 can be fused with the two inner layers. 4 , 12, and further between the sealing portion 6 and the foil layer 5, 13 The enclosure is sealed from the environment 10 by

[0032] Figure 3 shows a cross-section of the outer layer 2, foil layer 5 and inner layer 4 assembled with a spacer 8, these elements already being combined into a semi-finished product 20. The foil layer 5 is preferably irreversibly hardened (cross-linked) so that it does not lose its rigidity when reheated. The use of such a semi-finished product 20 in the manufacture of multiple glazings 1, 11 according to the invention limits the chance of deformations in the foil layers 5, 13 of the final glazing that would result in optical distortions.

[0033] Figure 4 shows a cross-section of a laminated window glass core 30 according to the invention after assembly as a semi-finished product for inclusion in a multiple layer window glass 1, 11 according to the invention. The window glass core 30 has two laminated transparent inner layers 31, 32 and a spacer 33 that separates the two inner layers 31, 32 and provides a free space 34 between them. A seal 35 surrounds the inner layers 31, 32 (and leaves a breathable connection to the outside air, not shown). Two transparent foil layers 36, 37 cover the outside of the inner layers 31, 32, and both cover the seal 35, but the transparent foil layers 36, 37 are not completely fused to the seal 35, so that a breathable connection to the outside air 10 remains for the free space 34 between the two laminated inner layers 31, 32.

[0034] FIG. 5 shows a side view of a vehicle glazing 40 according to the present invention having a three-dimensional shape.

Claims

1. A multi-layer glazing comprising: a transparent first outer layer; a transparent second outer layer; and a transparent third inner layer narrower than the first outer layer and the second outer layer, the third inner layer being positioned between the outer layers such that the transparent first and second outer layers extend beyond the third inner layer on all sides; an adhesive transparent foil layer located between the first outer layer and the third inner layer, connecting the third inner layer to the first outer layer over the entire surface of the third inner layer; a seal surrounding the third inner layer and hermetically connecting the contoured boundaries of the first and second outer layers; a transparent fourth inner layer positioned between the third inner layer and the second outer layer, the fourth inner layer being thinner and narrower than the first outer layer and the second outer layer; a second adhesive transparent foil layer located between the fourth inner layer and the second outer layer and connecting the fourth inner layer to the second outer layer over the entire surface of the fourth inner layer; Equipped with spacers distributed over the entire surface of the third inner layer on a side facing the second outer layer; the thickness of each of the first and second outer layers is at least twice the thickness of each of the third and fourth inner layers; the first and second outer layers extend beyond the third and fourth inner layers on all sides; The seal surrounds both the third and fourth inner layers and hermetically connects the contoured boundaries of the first and second outer layers.

2. 10. The multiple glazing of claim 1, wherein the spacer provides a free space adjacent the third inner layer, the free space being hermetically isolated from the outside air.

3. 3. A multiple glazing according to claim 1 or claim 2, wherein at least one transparent foil layer and / or the seals consist of a thermoplastic elastomer.

4. 4. A multiple glazing according to claim 1, which has a curved shape.

5. 5. A multiple glazing according to any one of the preceding claims, in which at least one inner layer has a thickness of less than 2.1 mm.

6. A multiple glazing according to any one of the preceding claims, wherein the spacers are printed onto a layer.

7. A multiple glazing according to any preceding claim, wherein the spacers are glass elements attached to the layers.

8. 8. A multiple glazing according to any one of the preceding claims, wherein at least one of the layers consists of glass, toughened glass or plastic.

9. 9. A thin glazing core incorporated into a multiple glazing according to any one of claims 1 to 8, comprising: at least two transparent laminate inner layers; a spacer separating the two inner layers to provide a free space between the two stacked inner layers; a seal surrounding the two laminated inner layers leaving a breathable connection to the outside air; two transparent foil layers covering the outside of both of the inner layers and at least partially covering the sealing portion; Equipped with A laminated glazing core, wherein the inner layer, the spacer, the seal and the foil layer are mechanically joined by an air-permeable connection to the outside air of the free space between the two laminated inner layers.

10. 10. A laminated window glass core according to claim 9, wherein at least one of the surrounding seal and / or the transparent foil layer comprises a thermoplastic elastomer that is pre-bonded in a not fully crosslinked or uncrosslinked state.

11. 11. A laminated window glazing core according to claim 9 or 10, wherein the surrounding seal and / or the transparent foil layer has a pre-bonded profiled surface.

12. 12. A laminated window glazing core according to any one of claims 9 to 11, wherein the surrounding seal and / or the transparent foil layer are spot welded to provide mechanical coherence to the laminated window glazing core.

13. 9. A method for producing a multiple glazing according to any one of claims 1 to 8, comprising combining the two laminated outer layers, at least one inner layer, the spacer, at least one transparent intermediate foil layer and the seal by applying heat and pressure to the laminate, a free space provided by the spacer adjacent to the third inner layer is subjected to a low atmospheric pressure and subsequently airtightly isolated from the outside air; The method of claim 1, wherein the pressure that adheres at least one inner layer together with the transparent intermediate foil layer to the corresponding outer layer is maintained at or below the level of the pressure difference between the environmental pressure level and the low pressure level of the free space, as long as the transparent intermediate foil layer is not cured.

14. The following successive method steps: a) thermally adhering at least one inner layer to an outer layer together with a transparent intermediate foil layer until said transparent intermediate foil layer is at least partially crosslinked; b) laminating the pretreated inner layer / intermediate foil / outer layer partial stack with at least one additional outer layer and a seal; c) placing the stack resulting from method step b) under heat and pressure in a low-pressure environment, wherein gas is applied from said free space during this treatment step; d) sealing the free space with the seals and uniting all the layers of the multiple glazing; The method of claim 13 comprising:

15. During the processing step a), two inner layers, together with a transparent intermediate foil layer, are each attached to a corresponding outer layer until both of the transparent intermediate foil layers are at least partially crosslinked; 15. The method of claim 14, wherein during processing step b), both of the pre-processed inner layer / intermediate foil / outer layer partial laminates are laminated together with an intermediate seal.

16. The following successive method steps: e) placing the laminated two outer layers, at least one inner layer, the spacer, at least one transparent intermediate foil layer and the seal in a low pressure environment, thereby bringing the free space to a low pressure level; f) sealing the free space; g) increasing the external pressure on the laminated package to a medium pressure level between the low pressure level used in method step e) and ambient pressure, and heating the laminated package until the laminated package is consolidated and the at least one foil layer is hardened; h) increasing the pressure on the combined stack to ambient pressure; The method of claim 13 comprising:

17. 17. The method according to claim 16, wherein before laminating the outer and inner layers, the seals and at least one transparent foil layer according to method step f), the thin laminated window glass core according to any one of claims 9 to 12 is produced as a semi-finished product, and the thin laminated window glass core in method step f) is integrated as part of the outer and inner layers, the seals and at least one transparent foil layer to be laminated.

18. 18. The method of claim 17, wherein the laminated window glass core in method step f) is heated to less than 65°C before being incorporated as part of the laminated outer and inner layers, the seal and at least one transparent foil layer.

19. 19. The method according to claim 17 or 18, wherein the semi-finished laminated glazing core is manufactured at a location different from the location at which the successive method steps f) to h) are carried out.

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