Insulating glazing and method for forming a closed frame-shaped spacer on a glazing panel

Abstract

A method for forming a closed, frame-shaped spacer (2) on a glass panel (3) for an insulating glass unit (1) is described by applying a spacer strand (4) made of a pasty, subsequently hardening plastic material to the glass panel (3). According to the invention, the spacer strand (4) is applied to the glass panel (3) in at least two superimposed layers (L1, L2) to form the spacer (2), wherein the spacer strand (4) is applied to the glass panel (3) in a first layer (L1), and wherein the spacer strand (4) is applied to the spacer strand (4) in a second layer (L2) over the spacer strand (4) in the first layer (L1). An initial section (6) of the spacer strand (4) in the first layer (1) and an end section (9) in the last layer (L2) overlap at least partially.

Description

[0001] The invention relates to a method having the features of the preamble of claim 1 and an insulating glass pane having the features of the preamble of claim 4.

[0002] From DE 44 33 749 A1, a method for forming a closed, frame-shaped spacer on a glass pane for an insulating glass unit is known. The spacer is formed by applying a spacer strand made of a pasty, subsequently hardening plastic material to the glass pane. This method is widely used in practice. Due to steadily increasing demands on the insulating performance of insulating glass units, larger gaps between two adjacent glass panes are required. When applying a spacer strand made of a pasty, subsequently hardening plastic material to a glass pane with a predetermined target thickness, it can happen that the still-soft spacer strand deforms and sags in the area of ​​the upper and / or lower edge of the glass pane due to its own weight, especially if the target thickness is greater than 18 mm.

[0003] From DE 10 2019 123 700 A1, an insulating glass unit and a method for its manufacture are also disclosed, in which a spacer strand is applied to a first glass pane and a second spacer strand is applied to a second glass pane. The joining point, where the beginning and end of the spacer strand meet, is always located in the same position when the frame-shaped spacer is applied, for example, in the area of ​​a lower left corner of the glass panes. After application, one of the two glass panes is rotated about an axis of rotation parallel to the plane of the glass pane and then assembled with the other glass pane in such a way that the two spacer strands come into contact with each other. After rotating one of the glass panes, the joining point on that glass pane is then located in the area of ​​the lower right corner.After assembly, sealing points on the spacer string are visible in two corners of the insulating glass unit. This procedure requires a special design of the manufacturing device or production line, namely, in particular, a rotary station for rotating a vertically oriented glass panel. Furthermore, a press station with two parallel horizontal conveyors is required, the two press plates of which are inclined in opposite directions in a V-shape to support the two opposing glass panels (see EP 2 802 727 B1). Consequently, this method cannot be carried out with the press stations and production lines currently used in practice and has therefore not been adopted.

[0004] A method and an insulating glass unit of the type mentioned above are known from WO 2019 / 076804 A1. The spacer contains at least two superimposed layers of different transparent materials with different properties. At least one layer serves to stiffen the spacer, and another layer serves to seal it. The beginning and end sections of the spacer strand in each layer butt against each other.

[0005] The invention is based on the objective of creating an improved method for manufacturing an insulating glass pane as well as an improved insulating glass pane.

[0006] The problem is solved by a method having the features of claim 1 and an insulating glass pane having the features of claim 4. Advantageous embodiments are the subject of dependent claims.

[0007] A method according to the invention for forming a closed, frame-shaped spacer on a glass pane for an insulating glass unit is part of a method for manufacturing an insulating glass unit according to the invention. An insulating glass unit according to the invention comprises at least two glass panes and a frame-shaped spacer, which is arranged between the two glass panes and, due to its thickness, holds them at a predetermined distance from each other. The space between the two glass panes can be filled with different media. In an insulating glass unit designed as a window pane, the space between the two glass panes can be filled with a gas other than air, for example, argon. In an insulating glass unit designed as fire-resistant glazing, the space between the two glass panes can be filled with a gel, for example, a saline hydrogel.The spacer is formed by applying a spacer strand to a glass sheet. The spacer strand is formed from a pasty, subsequently solidifying plastic material in a manner known per se. The plastic material can be a thermoplastic material that solidifies simply upon cooling. Alternatively, it can be a reactive cross-linking material in which solidification occurs through a chemical reaction. The spacer strand material can be applied to the glass sheet at a predetermined thickness using a nozzle. The nozzle can be moved around the edge of the glass sheet, depositing the emerging spacer strand onto the glass sheet in such a way that the beginning and end of the strand meet.

[0008] According to the invention, the spacer strand is applied to the glass sheet in two or more, in particular two to five, superimposed layers to form the spacer. The spacer strand is applied to the glass sheet in a first layer. Subsequently, the spacer strand is applied in a second layer over the spacer strand in the first layer. If the spacer is formed from only two layers, the second layer is also the last layer. The thickness of the spacer is determined by the multiple, in particular two, superimposed layers of the spacer strand. The spacer strand has at least a starting section in the first layer and a ending section in the last layer. The ending section in the last layer overlaps at least partially the starting section in the first layer.The finished spacer for the insulating glass unit thus has a section containing part of the initial section of the first layer and part of the final section of the last layer. At least at one point, the thickness of a two-layer spacer is therefore formed partly by the initial section of the first layer and partly by the final section of the second layer.

[0009] According to the invention, the spacer strand is applied continuously from the first layer to the second layer, and in particular continuously from the first layer to the last layer. The spacer strand has at least one transition section, which is arranged between the initial section in a first of the at least two layers and the final section in the last of the at least two layers. In particular, the spacer strand can have a transition section, which is arranged between the initial section in the first layer and the final section in the second layer. In the transition section, the spacer strand runs continuously from one layer to the other, in particular from the first layer to the second layer.In the transition section, the thickness of the spacer strand can be changed from the target thickness of one layer to the target thickness of the other layer, specifically from the target thickness of the first layer to the target thickness of the second layer. In the area of ​​the joining point of the frame-shaped spacer made of two layers, the total thickness is thus formed by the initial section in the first layer, the transition section lying on top of it, and the end section of the second layer lying on top of the transition section.

[0010] The invention has significant advantages: The total thickness of the spacer between the two glass panes is determined by the sum of the thicknesses of all superimposed layers of the spacer strip. Applying the spacer strip in at least two layers allows the first layer to solidify over a longer period, thus increasing its stability and load-bearing capacity when the second layer is applied. Undesirable deformation and / or sagging of horizontal sections of the frame-shaped spacer can be avoided, even with significant spacer thicknesses. This enables the reliable production of spacers with a thickness of 20 mm or more, particularly in the range of 25 mm to 60 mm. In the finished insulating glass unit, at most a single sealing point on the frame-shaped spacer is visible, which can improve the overall appearance.

[0011] In a further embodiment, the nozzle can be moved along the edge of the glass sheet at least twice, applying the spacer strand emerging from the nozzle to the glass sheet in at least two directly adjacent layers. The thickness of the spacer strand as it exits the nozzle can be increased from zero to the target thickness of the first layer over a predetermined length at the beginning and then reduced from the target thickness of the last layer to zero at the end of the spacer strand. The thickness of the spacer strand in the second or subsequent layer can be greater than the thickness of the spacer strand in the first layer, in particular by a factor of 1.2 to 1.6. This results in a relatively small cross-section of the spacer strand in the first layer, allowing the first layer to cool relatively quickly on the cool glass sheet. Consequently, the first layer can form a stable base for the application of the second layer after a relatively short time.This can effectively prevent unwanted deformations and / or sagging of the spacer. The end section in the last layer can be offset from the beginning section in the first layer. The end section in the last layer can be longer than the beginning section in the first layer.

[0012] The initial section in the first layer and the final section in the last layer can each be wedge-shaped. The initial section in the first layer can have a first inclined surface. The final section in the last layer can have a second inclined surface. The first inclined surface and the second inclined surface can be inclined in the same direction with respect to the glass surface of the finished insulating glass unit. The angle from the glass surface to the first inclined surface and / or the second inclined surface can be 45° or less, in particular 25° or less. The first inclined surface and the second inclined surface can have an angle of not more than 10°, in particular not more than 5°, to each other. The second inclined surface can be longer than the first inclined surface.The wedge-shaped initial section can be formed by increasing the thickness of the spacer strand from zero to the target thickness over a predetermined length as it exits the nozzle. The wedge shape of the final section can be complementary to that of the initial section. For this purpose, the thickness of the spacer strand in the final section can be reduced from the target thickness to zero over a predetermined length as it exits the nozzle. In particular, this predetermined length can be between 3 cm and 10 cm. The nozzle can have an outlet opening with a substantially rectangular cross-section and a slide for closing the outlet opening.

[0013] In a further embodiment, the spacer can be applied to the glass sheet in such a way that the beginning and end of the spacer strand meet in one layer. The spacer strand can have a starting section in the first layer, an end section in the first layer, and a starting section in the second layer. The spacer strand can also include an end section in the second layer. The starting section of the second layer is applied to the end section of the first layer. Thus, the starting section of the second layer and the end section of the first layer overlap at least partially. As the spacer strand exits the nozzle at the beginning of the first layer, its thickness can be increased from zero to the target thickness of the first layer over a predetermined length, and conversely, at the end of the first layer, it can be reduced from the target thickness to zero over the same length.The end section of the first layer overlaps the beginning section of the first layer at least partially.

[0014] Further details and advantages of the invention are explained with reference to exemplary embodiments of the invention and the accompanying drawings. Identical and corresponding components are identified by matching reference numerals. The drawings show: Figure 1 is a schematic side view of an insulating glass pane according to the invention with a spacer applied in two layers; Figure 2 is a perspective view of the insulating glass pane. Figure 1 during manufacturing, Figure 3 shows an enlarged section of a schematic side view of an insulating glass pane according to the invention, Figure 4 shows a perspective view of a closure point in the corner area of ​​a spacer applied in two layers, Figure 5 shows a similar representation Figure 4 on a different design of the locking point.

[0015] An insulating glass unit 1 contains a frame-shaped spacer 2 on a glass pane 3. Using a nozzle 5 (shown only schematically), the spacer strand 4 is applied to the glass pane 3 in two directly adjacent layers L1 and L2 to form the spacer 2. The first layer L1 is applied directly to the glass pane 3. The second layer L2 forms the final layer of the spacer 2. In an initial section 6, the thickness of the spacer strand 4 is increased to the target thickness D1 of the first layer L1 over a section S of predetermined length along a first inclined surface 7. The nozzle 5 is moved around the glass pane 3. When the nozzle 5 reaches the initial section 6 again, the spacer strand 4 is applied continuously to the inclined surface 7 in a transition section 8 (see figure). Figure 3 and 4The second layer L2 is then applied without interruption. In the area of ​​the transition section 8, the thickness of the spacer strand 4 is increased to the target thickness D2 of the second layer as it exits the nozzle. The nozzle 5 is then guided around the circumference of the glass sheet 3 a second time, thereby applying the second layer L2 to the spacer strand 4 already embedded in the first layer L1. In an end section 9, the target thickness of the spacer strand 4 is reduced from D2 to zero along a second inclined surface 10. The reduction of the target thickness in the area of ​​the end section 9 occurs over a distance that is longer than the distance S of the initial section 6. The end section 9 is slightly offset from the initial section 6, resulting in an equal offset V at the beginning and end.The inclined surfaces 7 and 10 have an angle W1 of approximately 25° to a glass panel surface 11 and are inclined in the same direction. An angle W2 between the two inclined surfaces 7 and 10 can be in the range of 0° to 5°. The total thickness D3 = D1 + D2 can be in the range of 20 mm to 50 mm, particularly in the range of 27 mm to 32 mm. If the layers L1 and L2 are of the same thickness, the two inclined surfaces 7 and 10 run parallel to each other, and the spacer strand 4 is also applied in the transition section 8 with a constant nominal thickness. The transition section 8 is thus arranged between the inclined surface 7 of the initial section 6 and the inclined surface 10 of the final section 9 and extends continuously from the first layer L1 to the second layer L2. The locking point 12 of the spacer 2 comprises the initial section 6, the transition section 8 and the final section 9 and is located at the point in . Figure 3The illustrated embodiment is located in a straight-running area of ​​the spacer 2. In the case of the Figure 4 In the illustrated embodiment, the sealing point 12 is located in the corner area of ​​the glass panel 3. After the spacer strand 4 has been completely applied to the glass panel 3, it is joined to another glass panel 13 in a manner known per se, cf. Figure 2 , joined together to form an insulating glass pane 1, such that the spacer 2 holds the two glass panels 3 and 13 at a predetermined distance from each other, cf. Figure 1 .

[0016] At the in Figure 5In the illustrated embodiment, the first layer L1 of the spacer strand 4 is initially terminated by an end section 14. The application of the spacer strand 2 is interrupted. Subsequently, the second layer L2 is started with a beginning section 15, which is applied to the end section 9 of the first layer, so that the beginning section 14 overlaps the end section 9. The first inclined surface 7 runs parallel to the second inclined surface 10. A third layer (not shown) can be added in a Figure 4 are applied to the second layer L2 in the appropriate manner, such that a transition section 8 extends from the second layer L2 to the third layer (not shown). Reference symbol list

[0017] 1 Insulating glass pane 2 Spacer 3 Glass panel 4 Spacer string 5 Nozzle 6 Initial section 7 First inclined surface 8 Transition section 9 End section 10 Second inclined surface 11 Glass panel surface 12 Sealing point 13 Glass panel 14 End section 15 Initial section D1Thickness L1 D2Thickness L2 D3Total thickness L1first layer L2second layer SDistance W1Angle W2Angle

Claims

1. Method for forming a closed, frame-shaped spacer (2) on a glass panel (3) for an insulating glass unit (1), by applying a spacer strand (4) of a pasty and subsequently hardening plastic material to the glass panel (3), wherein the spacer strand (4) is applied to the glass panel (3) in at least two superimposed layers (L1, L2) to form the spacer (2), wherein the spacer strand (4) is applied to the glass panel (3) in a first layer (L1), and wherein the spacer strand (4) is applied to the spacer strand (4) in a second layer (L2) over the spacer strand (4) in the first layer (L1). characterized by that the spacer strand (4) is applied continuously from one layer (L1) of the at least two superimposed layers (L1, L2) to another layer (L2) of the at least two superimposed layers (L1, L2).

2. Method according to claim 1, in which a nozzle (5) is moved along the edge of the glass sheet (3) at least twice around it and applies the spacer strand (4) exiting the nozzle (5) to the glass sheet (3) in at least two superimposed layers (L1, L2), wherein the thickness of the spacer strand (4) as it exits the nozzle (5) is increased at the beginning over a section (S) of predetermined length from 0 to the target thickness (D1) of the first layer (L1) and at the end of the spacer strand (4) is reduced from the target thickness (D2) of the last layer (L2) to 0.

3. Method according to one of the preceding claims, in which the spacer strand (4) is applied with a starting section (6) in the first layer (L1), an end section (14) in the first layer (L1) and a starting section (15) in the second layer (L2), wherein the starting section (15) in the second layer (L2) is applied at least partially to the end section (14) in the first layer (L1).

4. Insulating glass pane (1) with at least two glass panes (3, 13) and a spacer (2) arranged between them, which, due to its thickness (D3), holds the two glass panes (3, 13) at a predetermined distance from each other, wherein the thickness (D3) of the spacer (2) is formed by at least two superimposed layers (L1, L2) of a spacer strand (4) with a starting section (6) in the first layer (L1) and a final section (9) in the last layer (L2), characterized by thatthe initial section (6) in the first position (L1) and the final section (9) in the last position (L2) overlap at least partially, and that Between the initial section (6) in one position (L1) of the at least two positions (L1, L2) and the final section (9) in another position (L2) of the at least two positions (L1, L2) at least one transition section (8) of the spacer strand (4) is arranged, in which the spacer strand (4) runs without interruption from one position (L1) to the other position (L2).

5. Insulating glass pane according to claim 4, in which a transition section (8) of the spacer string (4) is arranged between the initial section (6) in the first layer (L1) and the end section (9) in the second layer (L2), in which the spacer string (4) runs uninterrupted from the first layer (L1) to the second layer (L2).

6. Insulating glass pane according to claim 4 or 5, in which the initial section (6) in the first position (L1) has a first inclined surface (7), in which the final section (9) in the last position (L2) has a second inclined surface (10), and in which the first inclined surface (7) and the second inclined surface (10) are inclined in the same direction.

7. Insulating glass pane according to one of claims 4 to 6, in which the spacer string (4) has an end section (14) in the first layer (L1) and an initial section (15) in a second layer (L2), wherein the end section (14) of the first layer (L1) and the initial section (6) of the first layer (L1) overlap at least partially, and wherein the initial section (15) of the second layer (L2) and the end section (14) of the first layer (L1) overlap at least partially.

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