DE102017111916A1 - Method and device for producing a glass element - Google Patents

Abstract

The invention relates to a method for producing a plate-shaped glass element (10) for use in motor vehicles, in which heat is supplied to a glass blank (14) so that the glass blank (14) becomes deformable and merges into a molten glass mass (100) (100). the glass blank (14) and / or the molten glass mass (16) is placed in a negative mold (18) (110), the molten glass mass (16) via a force acting on the molten glass mass (16) and / or pressing in at least two deformation steps to a plate-shaped glass element (10) is formed (120, 140), the plate-shaped glass element (10) is cooled and removed from the negative mold (18) (150), wherein between the at least two deformation steps, the molten glass mass (16) at least is cooled in sections and / or partially (130).
The invention also relates to a device (12) for producing a plate-shaped glass element.

Description

The present invention relates to a method for producing a glass element, in particular a plate-shaped glass element, wherein a molten glass mass is formed via a force acting on the molten glass mass force and / or pressure in at least two deformation steps to form a plate-shaped glass element, wherein between the at least two deformation steps the molten glass mass is cooled at least in sections and / or partially.

In addition, the invention relates to a device for producing a glass element, the device being adapted and designed to produce the glass element, in particular the plate-shaped glass element, by the method according to the invention.

The use of glass components in the interior of motor vehicles, for example touch-sensitive input surfaces, is often limited because the multiple curved surfaces in the interior of a motor vehicle are difficult to realize and the manufacturing costs of glass components with a curved surface are high. At the same time, high demands are placed on the surface quality and the surface shape of the glass components. The surface quality of plate-shaped glass components for use in motor vehicles is often only possible by downstream surface processing steps and surface treatments, which are time consuming and costly.

In principle, methods for the production of plate-shaped glass elements are well known. A production of a glass product is for example in the JP 62036029 A described. A preheated flat glass is clamped between a lower mold and an upper holder, wherein a high-temperature gas is applied via the upper holder under pressure to the clamped flat glass, so that the flat glass softens. By softening, the glass deforms and snuggles against the inside of the lower mold to assume the planned glass shape. A disadvantage of such methods may be that the surface of the glass product after the cooling process due to the temperature differences at least partially incident, whereby the surface quality of the glass product can be reduced.

The US 2010/0000259 A1 describes a method for producing shaped glass articles in which a glass sheet is placed on a profiled mold. The glass sheet is preferably heated very quickly within the mold, the mold being slightly colder than the glass sheet during the heating process. The heated glass sags on the profiled shape and thus assumes the corresponding contour of the shape. In addition, it can be provided that the heated glass is brought into the corresponding shape via a pressing process. Also in this method, the surface of the glass article may locally fall through the cooling process, whereby the surface quality of the glass article may be reduced.

There is a regular need to further develop processes for the production of glass elements, in particular plate elements, in order to reduce in particular costly and time-consuming process steps for the surface treatment of the shaped glass elements.

It is the object of the invention to provide a method for producing a plate-shaped glass element, which is inexpensive to produce.

The object is achieved by the features of the independent claims. Advantageous embodiments of the invention are specified in the subclaims. In this case, all combinations as well as isolated combinations between the features of the method and the device can be used together. Furthermore, it is also provided and possible to combine any or several features of the method and the device as desired.

According to the invention, a method for producing a plate-shaped glass element for use in motor vehicles, in which heat is supplied to a glass blank, so that the glass blank is deformable and passes into a molten glass mass, the glass blank and / or the molten glass mass is placed in a negative mold, the molten glass mass is formed into a plate-shaped glass element in at least two deformation steps via a force and / or pressure acting on the glass mass, the plate-shaped glass element is cooled and removed from the negative mold, wherein the molten glass mass is at least partially and / or between the at least two deformation steps is partially cooled.

A basic idea of the present invention is thus that heat is supplied to a glass blank in the method for producing a plate-shaped glass element, so that it becomes deformable. The deformable glass blank is a molten glass mass. Depending on the glass type and depending on the composition, the melting point of glass is between approx. 1000 ° C and 1600 ° C. This means that the glass blank is heated accordingly. The heat may preferably be supplied to the glass blank before it enters a negative mold is placed or given. A force and / or pressure is applied to the molten glass mass in order to mold the molten glass mass to the negative mold via the force and / or pressure, wherein the molten glass mass is shaped into a plate-shaped glass element in at least two, preferably temporally spaced, deformation steps , Between the two deformation steps, the molten glass mass is cooled at least in sections and / or partially. Sectionally means that preferably only a certain portion of the molten glass mass is cooled in the negative mold. This may preferably be an edge region. Partially means that not the entire glass mass, but preferably only one layer, preferably the outer layer, the glass mass is cooled. In principle, however, it can also be provided that the glass mass as a whole undergoes a temperature drop by cooling. After the at least second deformation step, the plate-shaped glass element is further cooled and removed from the negative mold. It can thus also be provided that more than two deformation steps are provided, wherein between each deformation step, a partial and / or partial cooling of the molten glass mass takes place. The invention takes advantage of the teaching that, usually in a one-step forming step to produce a shaped glass element, the surface may experience elevated stresses which may affect the surface quality of the glass element due to the temperature differences between the molded glass element and the cooler environment. By an at least two-stage shaping, in which between the two deformation steps, the molten glass mass or at least partially formed at least partially deformable plate-shaped glass element is at least partially cooled, can be done by the second deformation step, a post-compression of the glass element, whereby stresses in the surface in the Final cooling can be reduced. In this way, the plate-shaped glass element can have an increased surface finish, whereby downstream steps for surface treatment can be reduced. Thus, the manufacturing process of a plate-shaped glass element can be accelerated. At the same time manufacturing costs can be reduced.

Under a plate-shaped glass element is preferably understood a flat and / or disc-shaped glass element, in which two dimensions are large compared to a third dimension. The plate-shaped glass element is preferably curved and / or curved in a first direction and / or in a second direction. It may also be possible that only one surface of the plate-shaped glass element has a curvature in one and / or in two directions. Under a plate-shaped glass element is preferably understood also a cup-shaped glass element which is curved in all three spatial directions.

In principle, the glass blank can only be heated in the negative mold, so that the glass blank becomes deformable. A preferred embodiment of the invention is that the glass blank is added as a molten glass mass and / or as a viscous glass plate blank in the negative mold. For both variants, this means that the glass blank is at least partially heated before being placed in the negative mold. From this way, the heating of the glass blank can be carried out at least partially detached from the negative mold. Thus, the manufacturing processes can be accelerated. If the glass blank is a molten glass mass, the heating of the glass blank can take place completely independently of the negative mold. Under a viscous glass plate blank is to be understood a glass blank, which is heated but has not yet reached the melting temperature. For shaping therefore still heat must be added to the viscous glass plate blank. The glass blank is heated in such a way that it becomes deformable under the action of a force and / or pressure acting on the molten glass mass.

A preferred embodiment of the invention is that the molten glass mass is deformed via a punch force and / or a centrifugal force and / or a compressive force in a plate-shaped glass element. The stamping force can preferably be applied to the molten glass mass via a stamp, whereby a surface pressure can be exerted on the glass mass over the surface of the stamp, so that the plate-shaped glass element is preferably formed as a press-molded glass element. The pressure force is preferably an overpressure and / or a negative pressure, which is applied to the deformable glass blank or the molten glass mass. Preferably, the molten glass mass can first be pressed into the negative mold and then molded onto the negative mold via an applied blowing pressure or overpressure, so that the plate-shaped glass element can preferably be produced in a press-blow molding process and / or in a vacuum molding process. The molten glass mass can also be formed under the influence of centrifugal force on the negative mold by the negative mold is set in rotation. Thus, the plate-shaped glass member can be manufactured by the spin forming method. In this way, different possibilities are given, with the molten glass mass to a plate-shaped glass element can be formed and / or formed.

In a preferred embodiment of the invention it is provided that in the first deformation step, the shape of the plate-shaped glass element is formed, and in the second deformation step, the surface of the plate-shaped glass element is formed and / or post-pressed. This means that in the first deformation step, the deformable glass blank is shaped so far that it essentially corresponds to the planned desired shape. It can also be provided that the surface is completely formed. In the second deformation step, the surface is re-pressed. This means that stresses in the surface of the plate-shaped glass element due to temperature differences between the molten glass mass and the negative mold surrounding the glass mass can be reduced by the post-pressing. In the case of the press-molded glass element, this is preferably achieved in that the punch acting on the deformable glass blank is not yet driven directly into the end position for forming the plate-shaped glass element in the first deformation step. This takes place only in the second pressing process. In the press-blow process, an overpressure is built up in each case in the first deformation step and in the second deformation step. In the spin method it can be provided that the rotational speed is varied between the first deformation step and the second deformation step.

According to an advantageous development of the invention, it is provided that the force and / or pressure applied in the second deformation step is greater than or equal to the force and / or pressure applied in the first deformation step. With decreasing temperature of the glass mass, the toughness of the glass mass increases. To compensate for stresses in the surface and / or to reduce it is therefore provided that in the second deformation step, the surface pressure acting on the plate-shaped glass element is greater than in the first deformation step.

A preferred embodiment of the invention is that the negative mold at least partially has at least one overflow channel, and cooled and / or cooled between the least two steps, the overflow channel and / or rising into the overflow channel molten glass mass of the deformable glass blank. In this way, preferably, in the press-formed forming of the plate-shaped glass element after the first deformation step, the overflow channel can be cooled so that the molten glass mass ascending in the overflow channel becomes tougher and / or hardens faster. Thereby, the overflow channel can be sealed, so that during the second deformation step, the applied pressure can act evenly on the surface of the plate-shaped glass element.

In principle it can be provided that the negative mold is preheated in a ground state, so that the temperature difference between the deformable glass blank and the negative mold is reduced in order to reduce temperature-induced stresses. A preferred embodiment of the invention is that the negative mold is at least partially actively cooled. This can be provided to actively control the cooling process in the negative mold according to a cooling curve in order to be able to influence the stresses arising in the surface of the plate-shaped glass element. In addition, active cooling can influence, for example, an excess of glass mass exiting via the overflow channel and / or ascending in the overflow channel in order to seal off the overflow channel prior to the second deformation step by a glass mass solidifying in the overflow channel.

In a preferred embodiment of the invention, it is provided that at least one surface of the plate-shaped glass element is subsequently treated chemically and / or physically. Preferably, at least one surface of the glass element can be chemically hardened. This can preferably take place in that the plate-shaped glass element is placed in a molten salt, which is subsequently heated to 400 ° C preferably after. Potash ions from the molten salt penetrate into the surface of the plate-shaped glass element and replace smaller sodium ions there. After a cooling phase of the plate-shaped glass element, a compressive stress is built up in the surface by the larger potassium ions. The physical after-treatment of the plate-shaped glass element may preferably be that the plate-shaped glass element is thermally cured. In this way, the scratch resistance, the impact resistance, the bending strength and / or the temperature resistance of the plate-shaped glass element can be increased.

An advantageous development of the invention is that an optical coating is applied to at least one surface of the plate-shaped glass element. The optical coating can preferably be glued, laminated and / or laminated. The transmission and / or the reflection can preferably be influenced and / or changed via the optical coating. Most preferably, the optical coating is an antireflective coating. In this way, the plate-shaped glass element can preferably be anti-reflective. Thus, the Properties for using the plate-shaped glass element as a display in a motor vehicle are improved.

In principle, it can be provided that the negative mold has a desired format, so that the plate-shaped glass element has the corresponding nominal dimension after the deformation steps. A preferred embodiment of the invention is that the plate-shaped glass element is cut after removal from the negative mold in a desired shape. The cutting can preferably take place via a corresponding cutting tool with a hardened cutting wheel and / or a diamond, in which the surface of the plate-shaped glass element is torn and is broken at the tear. It can also be provided that the cutting takes place with a water jet method and / or with a laser method. The latter two methods enable a very precise cutting for almost any shape.

Depending on the type of blank, it may be necessary that a processing of the edges of the plate-shaped glass element is required. A preferred development of the invention provides that at least one edge of the plate-shaped glass element is ground and / or polished. In this way, injury in the handling of the plate-shaped glass elements can be reduced.

The invention further relates to a device for producing a plate-shaped glass element, with a negative mold, in which a molten glass mass can be introduced, a loading device, via which the deformable glass blank can be pressed against the negative mold for forming a plate-shaped glass element, wherein the device is set up and designed is to produce the plate-shaped glass element by the method according to the invention.

It is thus an aspect of the invention that the device and / or the loading device of the device is adapted to produce the plate-shaped glass element in at least two deformation steps, wherein between the two deformation steps, the molten glass mass is cooled at least partially and / or partially.

In an advantageous development of the invention, it is provided that the negative mold has at least one overflow channel. Of the Overflow channel is preferably a recess formed in a side wall of the female mold, into which at least a portion of the molten glass mass may rise in the first forming step. It is preferably provided that the glass mass rising in the overflow channel partially cools between the first deformation step and the second deformation step, whereby the overflow channel is sealed off. Thus, in the second deformation step, no or only a small portion of the molten glass mass can escape, so that the applied pressure during the second deformation step almost completely acts on the surface of the plate-shaped glass element, so that it can be post-pressed. In this way, the surface finish of the plate-shaped glass element can be increased.

A preferred embodiment of the invention is that the negative mold is actively cooled. This can preferably take place by means of a coolant which can be introduced into the negative mold and / or by air which can be introduced into the negative mold. The active cooling can preferably flown through arranged in the negative mold and / or trained cooling channels, in which the coolant and / or the air can be introduced. Particularly preferably, the cooling channels are formed in the region of the at least one overflow channel.

The invention will now be described by way of example with reference to the accompanying drawings with reference to preferred embodiments, wherein the features shown below, both individually and in combination may represent an aspect of the invention.

• 1 eine schematischen Ablauf eines Verfahrens zur Herstellung eines plattenförmigen Glaselements, gemäß einem bevorzugten Ausführungsbeispiel der Erfindung;
• 2 einen Schnitt durch eine schematisch dargestellte Vorrichtung zur Herstellung eines plattenförmigen Glaselements vor einem ersten Verformungsschritt, gemäß einem ersten bevorzugten Ausführungsbeispiel der Erfindung;
• 3 einen Schnitt durch die schematisch dargestellte Vorrichtung nach einem zweiten Verformungsschritt, gemäß dem ersten bevorzugten Ausführungsbeispiel der Erfindung;
• 4 eine Ansicht des ausgeformten plattenförmigen Glaselements in einer Negativform der Vorrichtung nach dem zweiten Verformungsschritt, gemäß dem ersten bevorzugten Ausführungsbeispiel der Erfindung;
• 5 eine Ansicht des ausgeformten plattenförmigen Glaselements, gemäß dem ersten bevorzugten Ausführungsbeispiel der Erfindung;
• 6 eine Ansicht des ausgeformten plattenförmigen Glaselements mit bearbeiteten Kanten, gemäß dem ersten bevorzugten Ausführungsbeispiel der Erfindung;
• 7 eine Ansicht einer Vorrichtung zur Herstellung eines plattenförmigen Glaselements, gemäß einem zweiten bevorzugten Ausführungsbeispiel der Erfindung;
• 8 eine Ansicht ausgeformter plattenförmiger Glaselemente, gemäß dem zweiten bevorzugten Ausführungsbeispiel der Erfindung.

It shows

• 1 a schematic sequence of a method for producing a plate-shaped glass element, according to a preferred embodiment of the invention;
• 2 a section through a schematically illustrated apparatus for producing a plate-shaped glass element before a first deformation step, according to a first preferred embodiment of the invention;
• 3 a section through the schematically illustrated device after a second deformation step, according to the first preferred embodiment of the invention;
• 4 a view of the molded plate-shaped glass element in a negative mold of the device after the second deformation step, according to the first preferred embodiment of the invention;
• 5 a view of the shaped plate-shaped glass element, according to the first preferred embodiment of the invention;
• 6 a view of the formed plate-shaped glass element with machined edges, according to the first preferred embodiment of the invention;
• 7 a view of an apparatus for producing a plate-shaped glass element, according to a second preferred embodiment of the invention;
• 8th a view of molded plate-shaped glass elements, according to the second preferred embodiment of the invention.

The 1 shows a process flow for producing a plate-shaped glass element 10 , wherein preferred and / or simplified representational embodiments of the device 12 and / or the plate-shaped glass element 10 the 2 to 8th can be seen.

In a first step 100, a glass blank 14 is heated to a molten glass mass 16. The temperature required for this depends on the particular glass type of the glass blank 14 from and is known in the art. Depending on the type of glass, the melting point of glass is between 1000 ° C and 1600 ° C. The molten glass mass 16 has a state in which the molten glass mass 16 is deformable. This means that the melting point of the glass blank has been exceeded.

In a second step 110 becomes the molten glass mass 16 of the glass blank 14 in a negative form 18 brought in. The molten glass mass 16 has an excess volume. This means that the volume of the molten glass mass 16 is greater than the volume of the negative mold 18 for forming the plate-shaped glass element 10 in the final state. The negative form 18 has at least one inside 20 to which the molten glass mass 16 can be pressed to a surface 22 the plate-shaped glass element 10 to train accordingly. The negative form 18 may be variously formed and / or stored to the plate-shaped glass element 10 produce with different molding processes. The preferred forming method in the present embodiment is a press-formed method of manufacturing a press-formed plate-shaped glass member 10 ,

In a third step 120 becomes the molten glass mass 16 about a stamp 24 to the inside 20 the negative mold 18 pressed to the shape of the plate-shaped glass element 10 in a first deformation step form. By relocating the stamp 24 in the direction of the negative mold 18, a stamping force is generated, which on the inside 20 facing stamp surface a surface pressure on the molten glass mass 16 b ewirkt.

In a fourth step following the third step 130 becomes the plate-shaped glass element 10 deformed molten glass mass 16 cooled at least partially and / or in sections. This can be done actively, preferably by local cooling measures, and / or passively, over time.

In a fifth step 140 is, after a partial local cooling of the molten glass mass 16 , by a second deformation step again a stamping force on the already plate-shaped glass element 10 formed at least partially molten glass mass 16 applied to the surface 22 the plate-shaped glass element 10 form and / or post-press.

In a sixth step 150 becomes the plate-shaped glass element 10 cooled and from the Nagativform 18 taken.

In this way, a method is provided in which the plate-shaped glass element 10 by at least two deformation steps 120 . 140 is formed, wherein between the first deformation step 120 and the second deformation step 140 the molten glass mass 16 is cooled at least partially and / or in sections. By the at least two deformation steps 120 . 140 can the surface properties of the plate-shaped glass element 10 be improved, so that measures for surface treatment can be reduced.

In 2 is the device 12 for forming the plate-shaped glass element 10 greatly simplified shown in a section, the device 12 is shown in a first embodiment. In the negative form 18 is the deformable glass blank 14 as a molten glass mass 16 placed so that this over the stamp 24 to the inside 20 the negative form 18 can be molded and / or pressed. In at least one on the inside 20 adjacent side wall 26 the negative form 18 are at least partially trained overflow channels 28 formed, wherein the overflow channels 28 as a depression in the sidewall 26 are formed, and a cross section of the overflow channels 28 with increasing distance to the inside 20 increased. Basically, the overflow channel 28 also have a different geometry and / or extending over the entire length of the sidewall 26 extend.

In 3 is that out 2 known simplistic device 12 shown, with the stamp 24 for shaping the plate-shaped glass element 12 in the direction of the negative mold 18 is relocated. The Stamp 24 has a first punching force for shaping the plate-shaped glass element 10 in a first deformation step on the molten glass mass 16 applied. This is partly molten glass mass 16 in the overflow channels 28 ascended. The in the overflow channels 28 rising molten glass mass 16 was at least partially cooled before applying a second punching force for the second forming step. By cooling the molten glass mass 16 in the overflow channels 28 these are sealed, so that during the second deformation step no molten glass mass 16 and / or only a reduced portion of the molten glass mass 16 over the overflow channels 28 can escape. Thus, during the second deformation step, a surface pressure to form the surface 22 on the plate-shaped glass element 10 be applied.

4 shows the negative form 18 with the one in the negative form 18 cooled plate-shaped glass element 10 after the second deformation step, wherein 5 the plate-shaped glass element 10 without negative form 18 is shown. The surface 22 the plate-shaped glass element 10 is formed arched at least in one direction. The plate-shaped glass element 10 thus has a different material thickness. The material thickness may preferably vary between 0.5 mm and preferably 6 mm. In the edge region of the plate-shaped glass element 10 are supernatants 30 educated. The supernatants 30 result from the in the overflow channels 28 during the first deformation step ascending molten glass mass 16 which is at least partially hardened after the first deformation step.

6 shows the plate-shaped glass element 10 i n a final state, with the edges 32 the plate-shaped glass element 10 at least in the area of the overhangs 30 are ground to reduce sharp edges. The plate-shaped glass element 10 can be treated further afterwards.

In 7 is a device 12 for shaping the plate-shaped glass element 10 in a highly simplified, second preferred embodiment. The contraption 10 includes two negative molds that are put together to form a cavity 34 train. About an opening 36 that in at least one of the two negative forms 18 is formed and in the cavity 34 can melt, the molten glass mass 16 in the cavity 34 be pressed. In the aftermath you can put one in the molten glass mass 16 applied pressure, preferably an overpressure, the molten glass mass 16 to the cavity 18 surrounding inside of the negative molds 18 be pressed. This can be done in two mutually spaced deformation steps, wherein between the deformation steps, the molten glass mass 16 at least partially cooled.

8th points to the inside of the negative mold 18 formed plate-shaped glass elements 10 without the negative forms 18 , Of the cavity 34 the negative form 18 is formed such that in a manufacturing process a plurality of plate-shaped glass elements 10 can be formed, which are finally cut by a laser. In this way, the manufacturing process can be accelerated.

LIST OF REFERENCE NUMBERS

Plate-shaped glass element

10

contraption

12

Deformable glass blank

14

Molten glass mass

16

negative form

18

inside

20

Surface plate-shaped glass element

22

stamp

24

Side wall

26

Overflow channel

28

Got over

30

edge

32

cavity

34

opening

36

Step 1

100

step 2

110

step 3

120

Step 4

130

Step 5

140

Step 6

150

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 62036029 A [0004]
• US 2010/0000259 A1 [0005]

Claims (14)

Method for producing a plate-shaped glass element (10) for use in motor vehicles, in which heat is supplied to a glass blank (14) so that the glass blank (14) becomes deformable and passes into a molten glass mass (16) (100), - the glass blank (14) and / or the molten glass mass (16) in a negative mold (18) is given (110), the molten glass mass (16) is formed into a plate-shaped glass element (10) via a force and / or pressure acting on the molten glass mass (16) in at least two deformation steps (120, 140), - The plate-shaped glass element (10) is cooled and removed from the female mold (18) (150), wherein - Between the at least two deformation steps, the molten glass mass (16) is cooled at least in sections and / or partially (130). Method according to Claim 1 , characterized in that the glass blank (14) as a molten glass mass (16) and / or as a viscous glass plate blank in the negative mold (18) is given. Method according to Claim 1 or 2 , characterized in that the molten glass mass (16) via a punch force and / or a centrifugal force and / or a compressive force in a plate-shaped glass element (10) is deformed. Method according to one of Claims 1 to 3 , characterized in that in the first deformation step, the shape of the plate-shaped glass element (10) is formed, and in the second deformation step, the surface (22) of the plate-shaped glass element (10) is formed and / or post-pressed. Method according to one of Claims 1 to 4 , characterized in that the force and / or pressure applied in the second deformation step is greater than or equal to the force and / or pressure applied in the first deformation step. Method according to one of Claims 1 to 5 , characterized in that the negative mold (18) at least partially at least one overflow channel (28), and between the least two deformation steps of the overflow channel (28) and / or in the overflow channel (28) rising molten glass mass (16) is cooled. Method according to one of Claims 1 to 6 , characterized in that the negative mold (18) is at least partially actively cooled. Method according to one of Claims 1 to 7 , characterized in that at least one surface (22) of the plate-shaped glass element (10) is subsequently treated chemically and / or physically. Method according to one of Claims 1 to 8th , characterized in that on at least one surface (22) of the plate-shaped glass element (10) an optical coating is applied. Method according to one of Claims 1 to 9 , characterized in that the plate-shaped glass element (10) after removal from the female mold (18) is cut into a desired shape. Method according to one of Claims 1 to 10 , characterized in that at least one edge (32) of the plate-shaped glass element (10) is ground and / or polished. Device (12) for producing a plate-shaped glass element, with a negative mold (18), in which a molten glass mass (16) can be introduced, a loading device, via which the molten glass mass (16) to the negative mold (18) for forming a plate-shaped glass element (10) is pressable, wherein the device (12) is adapted and adapted to produce the plate-shaped glass element (10) with the method according to one of the preceding steps. Device after Claim 12 , characterized in that the negative mold (18) has at least one overflow channel (28). Device after Claim 12 or 13 , characterized in that the negative mold (18) is actively cooled.

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