EP1888326A2

EP1888326A2 - Method for production of a curved screen arrangement for a vehicle

Info

Publication number: EP1888326A2
Application number: EP06753208A
Authority: EP
Inventors: Hubert Böhm; Mauro Pomaro
Original assignee: Webasto SE
Current assignee: Webasto SE
Priority date: 2005-05-31
Filing date: 2006-05-30
Publication date: 2008-02-20
Also published as: KR20080021029A; WO2006128430A3; US20080210361A1; JP2008542068A; WO2006128430A2; DE102005024857B3; CN101189127A

Abstract

The invention relates to a method for production of a curved screen arrangement for a vehicle, whereby a plastic film (22) is applied to a curved glass plate (18) by means of a die (24) to form a film composite (26). The film composite is subsequently subjected to a thermal treatment at a pressure below that of atmospheric pressure in order to laminate the plastic film to the screen. The plastic film is embodied as a cover film and an adhesive layer is applied between the cover film and the screen in order to form the film composite and to fix the cover film to the screen. According to the invention, before the reduction in pressure, a flexible spacer (30) is placed in a region of the plastic layer (22) with no adhesive layer (20) between the cover film and the screen (18) in order to promote the removal of air from between the die (24) and the cover film, whereby the cover film has a boundary region (38) with perforations (40) running to the middle (42) of the cover film (40) and which at least partly rests on the spacer. After lamination the boundary region provided with perforations is separated and removed along the perforations.

Description

Method for producing a curved pane arrangement for a vehicle

The present invention relates to a method for producing a curved disc arrangement for a vehicle according to the preamble of claims 1 and 20, respectively.

A generic method is described in US Pat. No. 5,622,580, where a domed glass panel for a vehicle roof is laminated by means of a polyvinyl butyral adhesive layer with an anti-crack polyester or polycarbonate layer by using an anticorrosion layer in an autoclave process by means of a rigid polycarbonate or metal or flexible die Die is pressed from a glass fiber material on the glass plate and then the layer sequence is evacuated and laminated by means of a pressure and heat treatment. After lamination, the die, which does not adhere to the anti-cracking layer, is removed.

A similar process is described in US 3,806,387 where a glass sheet for a vehicle is made by pressing an adhesive layer and a transparent plastic layer onto a curved glass sheet by means of a glass die having the same shape as the glass sheet to form a layer sequence is laminated on the glass sheet in an autoclave. After lamination, the glass matrix is removed again.

Another generic method is described in US Pat. No. 3,960,627, in which case an elastic matrix made of silicone rubber is used in order to press a plastic layer onto a glass pane. The lamination process is then carried out in a vacuum bag in an autoclave, inserting a soft cushioning material between the die and the inner wall of the vacuum bag.

In such lamination methods, the problem usually arises that at the interface between the Matrizenoberfäche (which may be flat or curved) and the Surface of the plastic film is trapped air. The reason for this lies in the three-dimensional curvature of the glass sheet, which promotes the inclusion of air residues during the evacuation before the actual lamination by the blowing off of the air path as a result of the contact pressure of the ambient atmosphere. Such air voids expand during the lamination process due to the heat applied to the laminate and leave after separation of the two surfaces usually elliptical, round or rounded indentations in the cooled after lamination foil composite. These indentations act as optical lenses and are therefore perceived by the eye as optical distortion.

US 2002/0155302 A1 describes a lamination method for laminating two glass panes, wherein a parallel grooved adhesive layer is introduced between the two glass panes in order to laminate them together. The grooves serve to avoid air bubbles between one of the two glass panes and the adhesive layer. It is also mentioned that such a method can also be used for a single pane of glass.

US 2004/0016506 A1 describes a lamination process in which an adhesive in structured form, e.g. in the form of parallel strands, between two plates to be bonded is introduced to avoid air bubbles between the two plates.

DE 38 51 997 T2 discloses a lamination method for laminating a plastic film on a glass sheet, wherein a covering film is applied for evacuation, which is placed on the plastic film and has a roughened surface so that it does not touch the surface of the plastic film adheres and thus facilitates the vent between the glass and the plastic film.

DE 103 23 234 A1 describes a method for laminating a curved glass pane for a vehicle roof with a plastic film, wherein in one embodiment prior to the pressure drop, a non-adhesive layer provided with a surface microstructure, in particular hard silk, is interposed between the plastic film and a die is inserted to facilitate the air outlet between the die and the plastic film, wherein the surface microsofructure is so fine that it does not appear on the plastic film. In another embodiment, a glass fleece strip is inserted between the disk and the plastic film in the edge region of the glass pane before the pressure reduction in order to facilitate the air outlet between the disk and the plastic film. The glass fleece strip lies in an area in which no adhesive layer is present, which otherwise provides for the connection between the plastic film and the disc.

From DE 35 11 396 Al a method for pre-pressing curved laminate packages is known, wherein two air-impermeable blankets at a distance from the outer edge of the laminate package are fixed to each other and form a vacuum chamber for the laminate package.

DE 30 44 717 C2 describes a method for producing a curved pane arrangement for a vehicle, wherein on one side of a bent glass pane a thermoplastic layer is laid, which is covered by a casing with lateral beads, the beads forming the edge of the glass pane grip on the other side of the glass to seal off the lamination.

In DE-OS 2 424 085 a method for producing a laminated glass pane is described, wherein during the lamination a rubber-elastic membrane is subjected to pressure and thereby presses the plastic film to be laminated against the glass sheet.

hi the non-prepublished German patent application with the file number 10 2004 034 175.3 is described a lamination method for producing a curved pane assembly for a vehicle, wherein spacers between the cover sheet and the disc or between the die and the disc are used.

It is the object of the present invention to provide a lamination method for producing a curved pane arrangement for a vehicle, wherein the best possible optical quality of the laminated film composite is to be achieved and, in particular, optical distortions in the film composite produced by air inclusions during the lamination process are to be avoided.

This object is achieved erfϊndungsgemäß by a method according to claim 1 or 20. It is generally advantageous that by providing a flexible spacer between the cover sheet and the disc, air pockets can be reduced or avoided during the lamination process so that the laminated product does not interfere with the surface structure in the form of dents or voids, which are called optical distortions would occur.

In the solution according to claim 1 is particularly advantageous that the or the spacer is not only between the cover sheet and the disc, but at the same time between the die and the disc, so that the vent is further improved during the lamination process to air pockets avoid. In particular, the provision of the spacer between the die and the disc avoids the die pressing excessively on the edge of the cover foil, thereby hindering the venting of the area between the cover foil and the die.

In the solution according to claim 20, it is particularly advantageous that, due to the provision of an edge region of the covering film which is easily separable due to perforations, this separable edge region acts in some way as a spacer, as a result of which the actual edge of the cover film, i. the edge remaining after removal of the separable edge region is relieved of the pressure exerted by the die, so that the venting of the central or remaining region of the cover foil is improved and the air inclusions, if present, are displaced into the separable edge region.

Preferred embodiments of the invention will become apparent from the dependent claims.

In the following the invention will be described by way of example with reference to the accompanying drawings. Showing:

Figure 1 is a schematic sectional view of a placed on a curved lower mold arched disc with applied films and applied die in a laminator in the closed state, wherein no spacers are shown here.

2 shows a schematic plan view of a cover film with an edge region which can be easily separated by means of perforations; FIG. 3 is a schematic sectional view of the cover film of FIG. 3 in the edge region with a spacer inserted before lamination; FIG.

4 is a schematic sectional view of a cover film in the edge region with a spacer inserted before lamination according to a further embodiment;

Fig. 5 is a view like FIG. 4, wherein a modified embodiment of

Spacer is shown;

Fig. 6 is a schematic plan view of an annular spacer;

Fig. 7 is a sectional view taken along the line A-A of Fig. 6;

Fig. 8 is a modification of the process of Fig. 1, wherein the lamination process is carried out in a vacuum bag rather than in a laminator into an autoclave;

Fig. 9 is a view like Fig. 2, showing a modified embodiment; and

Fig. 10 is a view like Fig. 2, wherein a further modified embodiment is shown.

FIG. 1 shows a laminator which has an upper chamber 10 and one of which, separated by a membrane 12, has a lower chamber 14. In the lower chamber 14, a concave lower mold 16 is arranged, which is preferably made of metal. In the convex recess of the lower mold 16, a curved glass pane 18 is inserted, on which in turn an adhesive layer 20, which is preferably a hot melt adhesive film, is applied. The hot-melt adhesive film 20 serves to connect a plastic cover film 22, which is placed on the adhesive layer 20, to the pane 18. On the cover sheet 22, in turn, a flexible die 24 is placed, which covers at least a central region of the disc 18 and the film composite 26 formed by the films 20 and 22. The lower mold 16 may be heatable in order to achieve a good and defined temperature control of the lamination process. The curvature of the Unterfoπn 16 may correspond to the curvature of the glass sheet 18 or be less than that of the disc 18.

The glass sheet 18 is preferably curved spherically or doppelzylindrisch and is made of toughened safety glass. In the laminated state, the pane arrangement can then be used for example as a transparent roof element, for example as an adjustable transparent cover of an openable vehicle roof or as a glass fixed element, or as a windshield, rear window or side window of a vehicle.

The adhesive layer 20 is preferably in the form of a thermoplastic polyurethane (TPU), PVB or EVA hot melt adhesive film.

The cover film 22 can be made, for example, from PET or polycarbonate (PC) or PMMA and can serve, for example, a splinter protection in the event of breakage of the glass pane 18, or a protection of provided on the disc electrical functional elements or functional layers against mechanical stress (eg shearing ) and to realize environmental influences. For this purpose, the cover film 22 is firmly connected in its edge region with the vehicle body or with a fixedly connected to the vehicle body holding element. Although this can basically be done purely mechanically, e.g. by screwing or jamming; Preferably, however, the cover sheet 22 is glued in its edge region with the body or the holding element or foamed in a foam with which serves to connect the disc 18 to the body. In this way, the cover sheet 22 is peeled open when the pane 18 breaks, thereby preventing occupants from being thrown out of the vehicle or objects from getting into the vehicle, as well as holding back the fragments of the pane 18.

Both the disk 18 and the film composite 26 are preferably transparent or translucent.

The die 24 may be, for example, thin glass or a metal foil, each with a layer thickness of less than 1 mm. If it is thin glass, is preferably alkali-free thin glass used, which may be chemically hardened, in order to combine sufficient flexibility of the die with a sufficient hardness. In particular, the thin glass can be so-called display glass, which is usually used in electronic displays. The side of the thin glass die facing the film composite 26 may be coated with a metal layer which may be electrically grounded to prevent electrostatic attraction of dust particles prior to being pressed onto the film composite 26. However, the coating of the die 24 can also be a so-called nano-coating, which is intended to prevent the die 24 from adhering to the film composite 26 during the lamination process, such that a lateral displacement of the die 24 on the film composite 26 takes place during the lamination process is possible.

Preferably, the die 24 is a second disc whose curvature is adapted to the curvature of the disc 18 to be laminated.

If the die 24 is formed as a metal foil, it is preferably highly polished in order to ensure a corresponding surface quality of the foil composite 26 after lamination. As materials such as aluminum, brass or spring steel in question. Furthermore, the side of the metal foil facing the film composite 26 may be suitably coated, e.g. shiny nickel, be.

To perform the lamination process, the membrane 12 is lowered until the lower chamber 14 is sealed airtight. Subsequently, both the upper chamber 12 and the lower chamber 14 are evacuated. In particular, the air between the

Film composite 26 and the disc 18 and between the die 24 and the film composite

26 are completely removed, since remaining air bubbles very disturbing to the optical

Appearance of the laminate act. The negative pressure used may be, for example, a fine vacuum of, for example, about 50 mbar. The following describes measures to achieve this air outlet by means of spacers (which are not shown in Fig. 1) as effectively as possible.

When a sufficient vacuum has been achieved in the lower chamber 14, the upper chamber 10 is vented, that is, brought to atmospheric pressure, while the lower chamber 14 is further evacuated. In this way, an overpressure of about 1 bar with respect to the lower chamber 14 is achieved, so that the membrane 12 presses with this pressure on the top of the die 24, whereby the die 24 is pressed with its underside on the film composite 26. At the same time, the actual lamination process is then started by heating the film composite 26 to an elevated temperature. This can be done for example by means of the heated lower mold 16. If the hotmelt adhesive film 20 is, for example, polyurethane, a temperature of about 95 to 150 ^° C. is expedient, it being possible for the heating phase to take about 15 minutes and then the temperature level to be maintained for 30 to 45 minutes.

Subsequently, the film composite 26 is cooled to room temperature, whereupon the lower chamber 14 can then be ventilated to remove the laminated with the film composite 26 glass 18 from the laminator. The die 24 is pulled off at the top.

Due to its flexibility, the laminator membrane 12 applies during the lamination process to the die 24, which in turn assumes due to their flexibility substantially the curvature of the bulging glass 18. The glass sheet 18 in turn is held in shape by the corresponding concave depression in the lower mold 16.

If a pressure of 1 bar for the lamination process is not sufficient, the upper chamber 10 of the laminator can be applied after venting with compressed air from a compressor with a pressure of up to 5 bar, whereby the die 24 then with a pressure between 1 and 5 bar is pressed onto the film composite 26.

In Fig. 1, the laminator is shown during the lamination process when the upper chamber 10 is vented while the lower chamber 14 is evacuated.

In principle, the lamination process can also be carried out in a circulation oven or autoclave instead of in a laminator, in which case no lower mold is used, but the glass pane 18 with the film composite 26 and the die 24 is placed in a vacuum bag, which is subsequently sealed vacuum-tight and is pumped out. The vacuum bag is then heated in the pumped-down state in an autoclave or in the circulation furnace, for example at 95 ° C to 150 ⁰ C, and in the case of using an autoclave with a pressure of for example 2 to 15 bar applied to perform the lamination process. The use of a vacuum bag has the advantage that it can accommodate several slices simultaneously in the form of a package (eg 5 slices one above the other).

Instead of a vacuum bag and a so-called vacuum lip ring can be used, which is a tube having a slot on the inside and is mounted on the glass with the film composite, the lips provide a vacuum tightness, so that the vacuum clip ring in Similar to how the vacuum bag can be pumped out.

A good evacuation of the space between the die 24 and the cover film 22 is crucial for achieving a good optical quality of the film composite 26, since air bubbles located between the die 24 and the cover film 22 during the lamination process lead to permanent dents in the surface of the cover film 22 can then act as optical lenses and distort the viewing through the film composite 26. Incidentally, this also applies to the area between the hot-melt adhesive film 20 and the glass pane 18, where the air in the form of bubbles can remain visible there.

FIG. 2 shows a plan view of a cover film 22 which has a central region 42 and an edge region 38 which surrounds the central region 42 in a ring-like manner and which are formed as slots 40 which adjoin one another by means of the central region 42. after lamination from the central area

42 is separable by the standing between the perforation slots 40 webs 44 are cut, for example by means of a knife. To the edge of the central region 42, the film is provided with completely penetrating holes 46, which serve to allow the adhesive or the foam compound to pass through the cover film 22 when the cover film 22 is connected to the vehicle body or a holding element connected to the vehicle body, to anchor in this way, the cover sheet 22 in the foam or the bond, so that a secure splinter protection function can be ensured with very high pull-out forces can. In principle, however, other anchoring means could also be used, for example a structuring or coating of the surface of the cover film 22 at the edge of the central region 42.

In Fig. 3, the edge portion of the cover sheet 22 is shown in a sectional view during lamination to the disc 18, wherein a die 24 presses on the cover sheet 22. Between the

Cover film 22 and the disc 18, an adhesive layer 20 is provided, but a

Edge portion of the cover sheet 22 is recessed from the adhesive layer 20. The one of the

Adhesive layer 20 recessed edge portion comprises the separable edge portion 38 and the edge region of the central portion 42 in which the holes 46 are arranged, wherein the recessed edge portion extends beyond the holes 46 inwardly.

hi the recessed edge portion, a spacer 30 is provided, which lies between the cover sheet 22 and the disc 18 and at the outer edge is preferably flush with the outer edge of the separable edge portion 38 and the outer edge of the disc 18. The die 24 extends at least to the outer edge of the separable edge portion 38. The spacer 30 is formed so that it does not adhere to the cover sheet 22 or to the disc 18 and is preferably reusable. For example, paperboard, plastic, e.g. Teflon, or rubber products in question. Together with the separable edge region 38, the spacer 30 serves to prevent air pockets in the central region 42 of the cover film 22, which could lead to disruptions of the surface structure in the form of dents or cavities, which would manifest themselves as optical distortions. Such perturbations may also take the form of a division out of the cover sheet surface, similar to a wall or crater profile. The spacer 30 may be annular in order to surround the adhesive layer 20 at its outer edge and to prevent the adhesive layer 20 from penetrating into the edge region of the cover film 22. For this purpose, however, a plurality of strip-like elements of the spacer 30 could be provided, which then together form an annular structure.

After completion of the lamination process, the spacer 30 is removed and the separable edge portion 38 is separated by severing the webs 44 between them Perforation slits 40 separated from the central region 42 of the cover sheet 22 and removed. The undercut in the edge region of the central region 42 protruding beyond the adhesive layer 20 serves to improve the anchoring of the cover film 22 in the foam or gluing to be applied later, whereby the undercut fills with foam compound or adhesive.

The cover sheet 22 is preferably made of PET, while the adhesive layer is preferably formed of PVB. The die 24 is preferably a glass sheet shaped according to the shape of the glass sheet 18.

5, a modified embodiment is shown in which the separable edge portion 38 of the cover sheet 22 is replaced by a part 52 of the spacer 30, wherein the part 54 may be loosely placed on a base portion 50 of the spacer 30 or fixedly connected thereto, for example, by sticking. In this case, the base part 50 forms a first region of the spacer 30 which, as in the example of FIG. 3, extends into a region of the cover foil 22 with the holes 46 recessed from the adhesive layer 20, while the applied-on or glued-on part 54 together with the underlying part of the base part 50 forms a second region 48 which has a greater thickness than the first region and lies between the die 24 and the disc 18 during lamination in order to reduce the pressure exerted by the die 24 on the marginal edge of the cover foil 22 whereby the ventilation of the area between the cover sheet 22 and the die 24 is improved. In this case, the first region 50 adjoins the adhesive layer 20 to the outside, while the second region 48 connects to the cover film 22 to the outside. Conveniently, before the pressure reduction, the first region 50 has a greater thickness than the adhesive layer 20 and the second region 48 has a greater thickness than the sum of the thickness of the adhesive layer 20 and the adhesive film 22. Preferably, the outer edge of the second region 48 is flush with the outer edge of the Disc 18.

The spacer 30 should be flexible enough to prevent breakage of the disc during pressurization. After pressurization, the spacer 30 should have a thickness equal to the sum of the thickness of the adhesive layer 20 and the cover sheet 22. The base part 50 of the spacer 30 may for example be made of cardboard or rubber, while the upper part 54 is preferably made of the same material as the cover sheet 22, preferably PET.

The spacer 30 may be annular to surround the cover sheet 22 and the adhesive layer 20 at the outer edge thereof. For this purpose, the

Spacer 30, however, also consist of a plurality of strip-shaped elements, which are placed together to form an annular configuration. In this case, embodiments are conceivable in which the upper part 54 is firmly connected only in partial areas with the lower part 50, while it is only loosely placed in the other areas.

Further, the second portion of the spacer may be formed so as to be completely covered by the upper portion 54 and thus have a greater thickness than the first portion or the base portion 50 in the entire peripheral edge portion, or the upper portion 54 is only in partial portions of FIG Provided peripheral edge portion, so that the second portion 48 of the spacer has only in certain parts a greater thickness than the first region. An example of the latter embodiment is shown in Figs. 6 and 7 where the top portion 54 of the spacer 30 is circumferentially provided with some recesses 52 in which the surface of the spacer is then formed only by the base layer 50. When the upper portion 54 is compressed by the pressure exerted by the die 24 during the lamination process, the die 24 in the recessed areas 52 may come into contact with the surface of the base ply 50, thereby laterally pushing the base ply 50 through the laminate during the lamination process direct contact with the die 24 is prevented.

The concept shown in FIGS. 6 and 7 can also be used in the embodiment shown in FIGS. 2 and 3, in which a separable edge portion 38 of the cover sheet 22 takes over the function of the upper part 54 of the spacer of Figs. 6 and 7 are used. This is shown schematically in Fig. 10, where the separable edge portion 38 of the cover sheet 22 with

Recesses 52 is provided, on which the die in contact with the single-stage

Spacer 30 may come to prevent it from slipping on the pressurization by means of the die to the outside. 4, a variant of the spacer of FIG. 5 is shown, in which the spacer 30 is not made of different materials, but is integrally formed, wherein the raised second region 48 is generated by appropriate shaping of the spacer 30. This can be done for example by pressing, eg pressing a fold, the spacer 30.

As material for the spacer 30 in this case, preferably the same material as in the lower layer 50 of the spacer 30 of FIG. 5, preferably cardboard, plastic, e.g. Teflon, or rubber used.

In all cases, the spacer 30 is formed so that it neither adheres to the cover sheet 22 nor to the disc 18 nor to the die 24.

Basically, in the present invention, the spacers 30 are to be formed so as to prevent them from laminating, i. without pressurizing the die 24, ensure that the die 24 does not abut the entire surface of the film composite 26, so that at least at the beginning of evacuation a very good air discharge from the space between the die 24 and the film composite 26 is made possible so that air inclusions possible can be avoided. On the other hand, the spacers 30 should be so flexible that, as the lamination process progresses, i. with substantially complete evacuation and at the elevated temperatures for the lamination process, the desired planar abutment of the die 24 on the film composite 26 does not hinder. In other words, in the conditions prevailing during the laminating conditions, the spacers 30 are to be compressed so much by the pressure exerted by the die 24 that the die 24 can then abut substantially flat against the film composite 26.

In Fig. 8, a modification to Fig. 1 is shown, wherein the lamination process is carried out in a vacuum bag instead of in a laminator in an autoclave or a circulating air oven.

In this case, a hot melt adhesive film 20 and a cover sheet 22 are placed on a first glass pane 18 A. A second correspondingly shaped glass sheet 18B is placed on the Cover foil 22 placed and serves as a template. The cover sheet 22 is formed in its edge region as in the embodiment of Figs. 2 and 3, ie it has a peripheral portion 38 which can be separated at perforations 40 after attaching the cover sheet 22 to the disc 18A, wherein a spacer 30 is provided is that between the disc 18A and the edge portion 38 and an adjoining portion of the cover sheet 22 which is provided with anchoring holes 46.

The disc 18B not only serves as a die for the disc 18 A, but it is also part of another glass lid, since on the disc 18 B, the same structure as on the disc 18 A is placed, namely an adhesive film 20, a cover sheet 22 and a spacer 30. On the cover sheet 22 of the second glass pane 18 B, a third glass pane 24 is placed, which, however, serves only as a template in the example shown and forms no further cover. In principle, however, more than two, e.g. Up to ten, glass sheets are placed on each other, which act both as a die and as a disc of a lid.

The stacked discs are placed together in a vacuum bag 60, which is evacuated and placed in an autoclave or forced air oven to perform the heat treatment to laminate the cover sheets 22 to the glass sheets 18A and 18B.

By simultaneously laminating a plurality of panes, the overall manufacturing process can be accelerated.

Instead of the construction shown in Fig. 8 with a cover sheet 22 having a separable edge portion 38 and a single stage spacer 30, the method of Fig. 8 may also use other edge or spacer configurations according to the invention, e.g. such as those in Figs. 4 to 7 are shown.

In Fig. 10, a modification of the embodiment of Fig. 2 is shown, wherein the separable edge portion 38 of the cover sheet 22 is provided at its outer edge with bendable, outwardly projecting Fixierlappen 62, 64, for example, the fixing lugs 62 by 90 degrees upwards and the fixing lugs 64 are bent 90 degrees down and are then fixed with adhesive tape in this position on the die, after the die has been placed on the cover sheet 22 placed on the disc 18 and the hot melt adhesive film 20. In this way, then a slipping of the separable edge portion 38 to the outside, which can be caused by the pressurization by the die, can be prevented. This is particularly helpful if, as in the embodiment of FIG. 8, several disks are laid one on top of the other during lamination, in which case each of the cover films 22 has corresponding fixing lugs 62, 64. The concept of the fixing tabs can also be used, for example, in a two-stage spacer 30, as shown for example in the embodiments of FIGS. 4 and 5, in which case the bendable fixing tabs are to be arranged on the outer edge of the spacer 30, in order to prevent the spacer from slipping 30 to prevent the outside when laminating.

Reference numeral list upper laminator chamber laminator membrane lower laminar chamber lower mold glass pane A glass pane B glass pane hot melt foil cover foil die composite of 20 and 22 spacers separable edge area of 22 perforation central area of 22 bars between 40 anchoring holes thicker area of 30 thinner area or base of 30 recess in 54 upper area of 30 vacuum bag fixation lugs on 22 fixation lobes on 22

Claims

claims

A method of making a domed disk assembly for a vehicle, wherein a plastic film (22) is pressed onto a domed glass sheet (18) by means of a die (24) to form a film composite (26) and wherein the film composite undergoes heat treatment subjected to a pressure below the atmospheric pressure to laminate the plastic film to the disc, wherein the plastic film is formed as a cover sheet, and wherein between the cover sheet and the disc, an adhesive layer is introduced to form the film composite and the cover sheet to the disc fastened, characterized in that before the pressure reduction at least one flexible spacer (30) having a first region (50) and a second region (48, 50) at least in a part (48) has a greater thickness than the first region comprising, with the first region in an area of the cover film (22) recessed from the adhesive layer (20) ) between the cover sheet and the disc (18) and with the second portion between the die (24) and the disc is inserted to facilitate the air outlet between the die and the cover sheet.

2. The method according to claim 1, characterized in that the second region (48, 50) of the spacer (30) in the inserted state adjoins the edge of the cover film (22).

3. The method according to claim 1 or 2, characterized in that the first region (50) of the spacer (30) in the inserted state adjoins the edge of the adhesive layer (20).

4. The method according to any one of the preceding claims, characterized in that the first region (50) of the spacer (30) before the pressure reduction has a greater thickness than the adhesive layer (20).

5. The method according to any one of the preceding claims, characterized in that the second region (48, 50) of the spacer (30) before the pressure reduction has a greater thickness than the total thickness of the adhesive layer (20) and the cover film (22).

6. The method according to any one of the preceding claims, characterized in that the spacer (30) is integrally formed.

A method according to claim 6, characterized in that the thickness differences between the first (50) and the second region (48) of the spacer (30) are produced by compression.

A method according to claim 6 or 7, characterized in that the spacer (30) is made of cardboard, plastic, e.g. Teflon, or rubber product.

A method according to any one of claims 1 to 5, characterized in that the first region (50) and at least the part (54) of the second region (48) of greater thickness than the first region are formed of different materials.

10. The method according to claim 9, characterized in that at least the part of the second region (48) with the greater thickness than the first region as laid on the material (50) of the first region or fixedly connected thereto, preferably glued, layer ( 54) is formed.

11. The method according to claim 10, characterized in that the launched or with the material (50) of the first region firmly connected layer (54) made of plastic, preferably PET, is formed.

12. The method according to claim 11, characterized in that the laid or firmly connected to the material (50) of the first region layer (54) consists of the same material as the cover sheet (22).

13. The method according to any one of claims 9 to 12, characterized in that the first region (50) consists of cardboard.

14. The method according to any one of claims 9 to 13, characterized in that the material (54) of the second region (48) only partially covers the material (50) of the first region.

15. The method according to any one of claims 9 to 14, characterized in that the spacer (30) is annular and thereby surrounds the edge of the adhesive layer (20).

16. The method according to any one of the preceding claims, characterized in that the spacers (30) are formed by a plurality of strip-shaped elements.

17. The method according to any one of the preceding claims, characterized in that the outer edge of the spacer (30) is substantially flush with the edge of the disc (18).

18. The method according to any one of the preceding claims, characterized in that the spacer (30) is formed so that it adheres neither to the cover sheet (22) nor to the disc (18) or the die (24).

19. The method according to any one of the preceding claims, characterized in that the region of the cover film (22), in which the spacer (30) between the cover sheet and the disc (18) is provided with the cover sheet penetrating holes (46).

20. A method for producing a curved pane arrangement for a vehicle, wherein a plastic film (22) is pressed onto a curved glass pane (18, 18 A, 18 B) by means of a die (18 B, 24) in order to form a film composite (26), and wherein the film composite is subjected to a heat treatment at a pressure below atmospheric to laminate the plastic film to the disk, wherein the plastic film is formed as a cover film, and wherein between the cover film and the disc, an adhesive layer is introduced to form the film composite and to secure the cover film to the disk, characterized in that before the pressure reduction at least one flexible spacer (30) is disposed in a region of the cover film (22) recessed from the adhesive layer (20) between the cover film and the disk (18, 18A, 18B) to facilitate air leakage between the die (18B, 24) and the cover sheet, the D eckfolie has an edge region (38), the center (42) of the cover sheet has perforations (40) and at least partially comes to lie on the spacer, and after lamination, the perforated edge region is separated and removed along the perforations.

21. The method according to claim 20, characterized in that the perforations are formed as adjoining slots (40), wherein adjacent slots are separated by a web (44).

22. The method according to claim 20 or 21, characterized in that the perforations (44) provided with edge region (38) is annular and surrounds the central region (42) of the cover film (22).

A method according to any one of claims 20 to 22, characterized in that the outer edge of the peripheral region (38) provided with perforations (44) is substantially flush with the outer edge of the spacer (30).

24. The method according to claim 23, characterized in that the outer edge of the perforations (44) provided with the edge region (38) and the outer edge of the spacer (30) are substantially flush with the edge of the disc (18).

25. The method according to any one of claims 20 to 24, characterized in that the spacer (30) is formed so that it neither on the cover sheet (22) nor on the disc (18, 18A, 18B) adheres.

A method according to any one of claims 20 to 25, characterized in that the spacer (30) extends inwardly beyond the perforations (44).

27. The method according to any one of claims 20 to 26, characterized in that with respect to the perforations (44) provided with the region (38) inside region (42) of the cover film (22), in which the spacer (30) between the cover sheet and the disc (18, 18A, 18B) is provided with the cover sheet penetrating holes (46).

28. The method according to any one of the preceding claims, characterized in that the spacer (30) is reusable.

29. The method according to any one of the preceding claims, characterized in that the die (18B, 24) is formed as a glass sheet.

30. The method according to claim 29, characterized in that on the other side of the serving as a die glass sheet (18 B) by means of a further die (24) pressed by a cover film (22) and an adhesive layer foil composite and laminated by means of the heat treatment to this becomes.

31. The method according to claim 30, characterized in that the two glass sheets (18 A, 18 B) and the die (24) are placed in a vacuum bag, the vacuum bag is evacuated, and located in the evacuated vacuum bag discs in an autoclave of the heat treatment be subjected.

A method according to any one of the preceding claims, characterized in that the die (18B, 24) has a curvature equal to or greater than that of the disc (18, 18A).

33. The method according to any one of the preceding claims, characterized in that the cover film (22) consists of PET, PC or PMMA.

34. The method according to any one of the preceding claims, characterized in that the adhesive layer (20) consists of PVB, PU, EVA or an ionomer film.

35. The method according to any one of claims 1 to 30, characterized in that the heat treatment is carried out in a laminator, a circulation furnace or an autoclave.

36. The method according to any one of the preceding claims, characterized in that the plastic film is formed as a cover sheet (22) which acts as protection against mechanical effects on the disc (18, 18A, 18B) or as splinter protection and msassenrückhalteschutz in case of damage to the disc.

37. The method according to any one of claims 20 to 27, characterized in that the separable edge region (38) is provided at its edge with outwardly projecting, bendable Fixierlappen (62, 64).

38. The method according to any one of claims 1 to 19, characterized in that the spacer (30) is provided at its edge with outwardly projecting, bendable Fixierlappen.