Extrusion nozzle and method for discharging an extruded profile
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- SAINT GOBAIN SEKURIT FRANCE
- Filing Date
- 2024-07-17
- Publication Date
- 2026-07-08
Smart Images
Figure EP2024070267_06032025_PF_FP_ABST
Abstract
Description
[0001] EXTRUSION DIE AND METHOD FOR EXTRACTING A PROFILE STRAND
[0002] The invention relates to an extrusion nozzle, an extrusion device, a method for extrusion and the use of the extrusion nozzle.
[0003] The manufacture of seals for various vehicle components is of great importance in the automotive industry. Vehicle glazing, in particular, must be provided with sealing elements before installation in the designated areas of the body. Commonly used sealing elements include polymers such as polyurethanes, polyolefins, polysulfides, polyepoxides, natural rubber, nitrile rubber, styrene-butadiene rubber, ethylene-propylene-diene rubber (EPDM), RTV (room-temperature-curing) silicone rubber, and HTV.
[0004] (high-temperature curing) silicone rubber, peroxide curing
[0005] Silicone rubber, addition-curing silicone rubber, polyacrylates, and / or thermoplastic elastomers. These sealing elements serve to manage water and can prevent moisture penetration. Furthermore, they prevent the development of annoying driving noises such as whistling noises in the passenger compartment.
[0006] Another important function is the stress-free, reproducible, and stable insertion of the glazing into the designated recess in the vehicle body. An established method for producing seals for a window is the extrusion and subsequent curing of a polymer mass into a profile strand, or cooling when using thermoplastic materials. If necessary, a primer can also be applied in preparation. The profile strand is formed either at the molecular level, for example through living polymerization, chain polymerization, polycondensation, polyaddition, or, in the case of thermoplastic elastomers, by heating and subsequent cooling. To improve the elastic properties, polymer crosslinking can follow, for example, through increased temperature, air humidity, or the addition of oxygen.For better installation in the body and to increase stability and tightness, the profile strand often also includes support lips (sealing lip, centering). These lips can be manufactured simultaneously as part of the profile strand using appropriately shaped extrusion nozzles. The position, size, and shape of the profile strand can vary depending on the pane geometry. It is desirable to provide glazing that comprises a pane with a seal, with the seal flush with a surface of the pane. On the one hand, such glazing is aesthetically advantageous, and on the other hand, it prevents the deposit of dirt that could accumulate in a gap between the seal and the pane if the arrangement were not flush.
[0007] EP2799201A1 discloses a method and a mold for producing a disk assembly comprising a disk and a seal, wherein the seal can be flush with a surface of the disk. A low-viscosity composition is used in the manufacturing process to form the seal, which is poured into an open or semi-open mold. Due to the use of the low-viscosity composition, a complex machine design and an equally complex manufacturing process are required.
[0008] US 5 108 526 A discloses a device for applying a polymer profile directly to a peripheral edge of an object.
[0009] US 5 552 194 A discloses an extrusion die, a method for producing a molding on a plate-shaped article and a plate-shaped article with the produced molding.
[0010] EP 2 794 227 B1 discloses an extrusion nozzle and a method for dispensing a continuously variable profile strand.
[0011] US 5 326 592 A discloses an apparatus for applying a coating solution to an extruded substrate.
[0012] US 5 057 265 A discloses a method for manufacturing a spacer for a windshield mount.
[0013] US 2015 / 217326 A1 discloses a sealant forming nozzle, a sealant forming apparatus and a sealant forming method.
[0014] The present invention is therefore based on the object of providing an extrusion nozzle by means of which a glazing can be produced simply and inexpensively, said glazing comprising a pane and a seal, wherein the seal is flush with a surface of the pane.
[0015] The object of the present invention is achieved by an extrusion die according to claim 1. Preferred embodiments are set out in the subclaims. The invention also relates to an extrusion device comprising the extrusion die, a method for extrusion using the extrusion device, and the use of the extrusion die for extruding a profile strand.
[0016] The extrusion die according to the invention for dispensing a profile strand comprises: an extrusion die body, wherein the extrusion die body has an extrusion die head at a first end in a direction of extension and a connecting element at a second end, wherein the extrusion die head comprises a lower surface arranged perpendicular to the direction of extension and an indentation arranged in the direction of extension and adjacent to the lower surface of the extrusion die head, and a first extrusion die opening and a second extrusion die opening, which are each arranged in a region of the extrusion die head that borders the indentation, wherein the indentation is concave starting from the first extrusion die opening and the second extrusion die opening.
[0017] According to the invention, the extrusion die is suitable for extruding a profile strand. This means that, in an extrusion process, a polymer can be formed into a profile strand via the extrusion die according to the invention. The extruded profile strand can be used, after the polymer has cured, as a seal for glazing, in particular vehicle glazing. Curing can occur through a chemical reaction induced in the extruded polymer itself, through the absorption of moisture in the air, or through a physical change, such as a phase change due to cooling.
[0018] The extrusion die according to the invention comprises an extrusion die body, wherein the extrusion die body has an extrusion die head at a first end in a direction of extension and a connecting element at a second end. For the purposes of the invention, an "extrusion die head" is understood to mean the part of the extrusion die body from which the extrudate emerges in an extrusion process. According to the invention, the first extrusion die opening and the second extrusion die opening are arranged in the extrusion die head.
[0019] The connecting element is not particularly limited. It is preferably designed to connect the extrusion nozzle to a mass-conveying means. The connection between the connecting element and the mass-conveying means can be, for example, a screw connection or a plug connection. The extrusion nozzle body can be firmly connected to the connecting element or designed as a single piece. The connecting element can have a groove and a reference pin in the extension direction of the extrusion nozzle body and can be fastened to the optionally provided robot described below by means of a nut.
[0020] The direction of extension of the extrusion die body is the direction in which the extrusion die body has its greatest extension. According to the invention, the extrusion die head is arranged at a first end and the connecting element is arranged at a second end in the direction of extension of the extrusion die body. The direction of extension is preferably perpendicular to the feed direction. The "feed direction" is the direction in which the extrusion die is moved during the extrusion process.
[0021] According to the invention, the extrusion nozzle head comprises a lower surface arranged perpendicular to the extension direction. In particular, the "lower surface" represents the surface that separates the extrusion nozzle from the surroundings as the lowest surface in the extension direction. In contrast, the extrusion nozzle is separated from the surroundings at the second end by the connecting element in the extension direction.
[0022] Preferably, the lower surface has an L-shape in a plan view of the lower surface. The L-shape comprises a long leg and a short leg. By using the L-shape, sufficient contact can easily be established between the extrusion nozzle and a support in an extrusion process, while excessive contact can be avoided. Excessive contact would make it difficult to guide the extrusion nozzle over the support in an extrusion process. In a preferred embodiment, the short leg of the L-shape is arranged parallel to the feed direction. More preferably, the long leg of the L-shape borders on the first end of the indentation described below. Most preferably, the edge of the long leg facing away from the short leg borders on the first end of the indentation described below.
[0023] In a preferred embodiment, a further surface is arranged adjacent to the lower surface and extends in the feed direction from the lower surface. This further surface comprises a first end adjacent to the lower surface and a second end arranged opposite the first end. The second end of the further surface is preferably located above a plane that runs through the lower surface in the direction of extension of the extrusion die body. This means that the further surface, starting from the lower surface, runs in a wedge shape in the direction of extension of the extrusion die body. This makes it possible to minimize contact between the extrusion die and a support in an extrusion process, which enables easy guidance of the extrusion die.
[0024] According to the invention, the extrusion die head comprises an indentation arranged in the extension direction of the extrusion die body and adjacent to the lower surface of the extrusion die head. Preferably, the indentation is directly adjacent to the lower surface of the extrusion die head. Thus, using the extrusion die, a seal can easily be obtained that is flush with the surface of a disc. This also means that this surface of the disc does not have a profile strand as a result of the extrusion process. For the purposes of the invention, a "indentation" is understood to mean an inwardly curved shape. The indentation represents a recess in the extrusion die head itself and is different from the extrusion die openings. The indentation is suitable for receiving a disc at its edge.This means that the disc is then positioned in the recess such that the side edge of the disc is aligned toward the recess. For the purposes of the invention, "flush" means that the corresponding parts are arranged in one plane. In a preferred embodiment, the recess, viewed from above in the feed direction of the extrusion die, has the shape of a circular arc. This allows it to easily accommodate a disc.
[0025] According to one embodiment, the indentation has a first end and a second end. The first end of the indentation preferably borders the lower surface of the extrusion die head. A flat surface preferably extends from the second end of the indentation in the direction in which the indentation is concave. In particular, the flat surface is parallel to the surfaces of a pane arranged in the indentation during an extrusion process. This makes it particularly easy to accommodate a pane in the indentation and to apply a profile strand to the surface of the pane opposite the surface with which the profile strand is flush. This allows good sealing of the corresponding glazing to be achieved.
[0026] According to one embodiment, the first end of the indentation represents a terminal edge of the extrusion nozzle, which, in a plan view of the extrusion nozzle in the feed direction, is set back from the flat surface. "Terminal edge" here means that this edge represents the outermost surface of the extrusion nozzle in this region. "Set back" here means that the extrusion nozzle has a smaller width in the region of the first end of the indentation than in the region of the flat surface. The width of the extrusion nozzle here refers to the direction in which the indentation is concave.
[0027] In a preferred embodiment, the extrusion die head comprises a front recess that has the shape of the desired profile strand and extends from the frontmost region of the extrusion die head in a plan view of the extrusion die in the feed direction to the region of the extrusion die head in which the first extrusion die opening and the second extrusion die opening are located. This allows the emerging extrudate to be easily formed into the desired profile strand.
[0028] The extrusion die body preferably comprises at least one metal selected from iron, chromium, cobalt, nickel, titanium, manganese, aluminum, niobium, tungsten, molybdenum, and vanadium. The extrusion die body is particularly preferably made of steel. According to a further embodiment, the extrusion die body comprises a temperature-stable plastic.
[0029] For example, the extrusion nozzle is manufactured using a 3D printing process or by injection molding.
[0030] According to the invention, the extrusion die comprises a first extrusion die opening and a second extrusion die opening, each of which is arranged in a region of the extrusion die head adjacent to the indentation, wherein the indentation is concave, starting from the first extrusion die opening and the second extrusion die opening. As long as the first extrusion die opening and the second extrusion die opening are present, the additional number of extrusion die openings is variable and depends on the desired shape of the profile strand. Because the first extrusion die opening and the second extrusion die opening are arranged in this region of the extrusion die head, a profile strand can be easily applied to the pane.
[0031] Preferably, the first extrusion die opening and the second extrusion die opening are each arranged in the extrusion die head such that they are open in the direction opposite to the feed direction. This makes it easy to achieve continuous extrusion of the profile strand with a uniform profile.
[0032] In a preferred embodiment of the invention, the first extrusion die opening is arranged in a region of the extrusion die head that is perpendicular to and adjacent to the lower surface of the extrusion die head. This allows for easy extrusion of a profile strand that is flush with a surface of the pane.
[0033] Preferably, the second extrusion nozzle opening is arranged such that it is further away from the lower surface of the extrusion nozzle head than the first extrusion nozzle opening in the direction of extension. This makes it easy to obtain a profile strand that, in addition to being flush with a surface of the pane, is also arranged at the pane edge. Further preferably, the second extrusion nozzle opening extends into a region of the extrusion nozzle head that, starting from the lower surface of the extrusion nozzle head, lies above the flat surface described above. This makes it easy to apply a profile strand to the surface of the pane opposite the surface with which the profile strand is flush. This allows for good sealing of the corresponding glazing.
[0034] In one embodiment of the invention, the first extrusion nozzle opening and the second extrusion nozzle opening each have a minimum opening area of at least 1 mm 2 In one embodiment, the first extrusion die opening and the second extrusion die opening each have a maximum opening area of at most 100 mm 2 on.
[0035] In a preferred embodiment, the extrusion nozzle further comprises a first feed channel and a second feed channel.
[0036] Preferably, the first feed channel extends through the extrusion nozzle body to the first extrusion nozzle opening and the second feed channel extends through the extrusion nozzle body to the second extrusion nozzle opening.
[0037] In one embodiment, the first feed channel and the second feed channel are arranged in the connecting element. In another embodiment, the connecting element has an opening that extends into the extrusion nozzle body and divides into the first feed channel and the second feed channel within the extrusion nozzle body.
[0038] The cross-sectional shape of the first supply channel and the second supply channel is not particularly limited. For example, the cross-sectional shape of the first supply channel and the second supply channel is circular.
[0039] In one embodiment, the extrusion nozzle has a number of separate feed channels identical to the number of extrusion nozzle openings, wherein in particular the feed channels at a second end of the extrusion nozzle body have the cross-section of a circle and the cross-section changes along the extrusion nozzle body to the cross-sectional area of the extrusion nozzle openings.
[0040] The opening area of each of the first feed channel and the second feed channel is not particularly limited and can be suitably selected by the person skilled in the art, depending on the polymer used and the desired flow rate.
[0041] The invention further comprises an extrusion device comprising the extrusion nozzle according to the invention, a mass-promoting means which is connected to the extrusion nozzle, and a support which is in contact with the lower surface of the extrusion nozzle head of the extrusion nozzle, wherein the extrusion device is configured to receive a disk having a first surface, a second surface and a side edge arranged between the first surface and the second surface on the edge side in the recess of the extrusion nozzle head of the extrusion nozzle, so that the first surface of the disk is arranged flush with the lower surface of the extrusion nozzle head and the support is in contact with the first surface of the disk.
[0042] The embodiments described above in connection with the extrusion nozzle according to the invention also apply in the same way to the extrusion device according to the invention.
[0043] The mass-conveying means comprised by the extrusion device is not particularly limited, as long as it is suitable for conveying a mass, i.e., a polymer mass. For example, the mass-conveying means can be an extruder, a piston feeder, or a gear pump. Such means are well known to those skilled in the art.
[0044] According to the invention, the mass-promoting means is connected to the extrusion die. Preferably, the mass-promoting means is connected to the extrusion die via the connecting element described above.
[0045] According to the invention, the extrusion device is configured to receive a disc having a first surface, a second surface, and a side edge arranged between the first surface and the second surface, on the edge side, in the indentation of the extrusion die head, such that the first surface of the disc is arranged flush with the lower surface of the extrusion die head and the support is in contact with the first surface of the disc. By arranging the first surface of the disc flush with the lower surface of the extrusion die head and using the support, which is in contact with the first surface of the disc and with the lower surface of the extrusion die head, a profile strand can be formed that is flush with the first surface of the disc.
[0046] The extrusion nozzle and the disk are preferably spaced apart from one another. In a preferred embodiment, the distance between the extrusion nozzle and the disk is at least 0.1 mm. This makes it easy to avoid scratches on the disk and wear on the extrusion nozzle. In a preferred embodiment, the distance between the extrusion nozzle and the disk is at most 0.4 mm. At a greater distance, excessive material escape at this gap and cross-sectional changes in the profile strand can occur. The distance is preferably adjusted via a guide wheel, which is preferably arranged on the robot mentioned below. The guide wheel is preferably in contact with the disk throughout the entire extrusion process. This makes it easy to ensure the desired distance between the extrusion nozzle and the disk.
[0047] The pane, which can be arranged in the extrusion device according to the invention, comprises a first surface, a second surface, and a side edge arranged between the first surface and the second surface. The pane is preferably made of glass, particularly preferably of soda-lime glass, as is common for window panes. However, the pane can also be made of another type of glass, for example, quartz glass, borosilicate glass, or aluminosilicate glass, or of rigid, clear plastics, for example, polycarbonate or polymethyl methacrylate.
[0048] The thickness of the disc can vary widely and thus be adapted to the requirements of each individual case. If the disc is designed as a monolithic disc, it preferably has a thickness of 0.5 mm to 5 mm, more preferably 1 mm to 3 mm, and most preferably 1.6 mm to 2.1 mm.
[0049] In a preferred embodiment of the invention, the pane is a composite pane comprising at least in the following order: an outer pane having an outer surface and an inner surface, a thermoplastic intermediate layer and an inner pane having an outer surface and an inner surface, wherein the outer surface of the outer pane corresponds to the first surface of the pane.
[0050] As described above, the outer pane and the inner pane each have an outside surface, i.e., an outer surface, and an inside surface, i.e., an inner surface, and a circumferential side edge running therebetween. For the purposes of the invention, the term "outer surface" refers to the main surface intended to face the outside environment in the installed position. For the purposes of the invention, the term "inner surface" refers to the main surface intended to face the interior in the installed position. The inner surface of the outer pane and the outer surface of the inner pane face each other in the composite pane.
[0051] The surfaces of the composite pane are typically referred to as follows:
[0052] The outer surface of the outer pane is called Side I. The inner surface of the outer pane is called Side II. The outer surface of the inner pane is called Side III. The inner surface of the inner pane is called Side IV.
[0053] According to a preferred embodiment of the invention, the outer surface of the outer pane corresponds to the first surface of the pane. This allows the production of a profile strip that is flush with the outer surface of the outer pane.
[0054] If the composite pane is intended to separate an interior space from the exterior environment in a window opening of a vehicle or building, the inner pane, within the meaning of the invention, refers to the pane facing the interior (vehicle interior). The outer pane refers to the pane facing the exterior environment.
[0055] The outer pane and inner pane are preferably made of glass, particularly preferably soda-lime glass, as is common for window panes. However, the panes can also be made of other types of glass, such as quartz glass, borosilicate glass, or aluminosilicate glass, or of rigid, clear plastics, such as polycarbonate or polymethyl methacrylate. The panes can be clear, tinted, or colored. If the laminated pane is used as a windshield, the outer pane and inner pane should have sufficient light transmission in the central viewing area, preferably at least 70% in the main viewing area A according to ECE-R43. The outer pane and inner pane are preferably curved, i.e., they have a bend.
[0056] The thickness of the outer pane and the inner pane can vary widely and thus be adapted to the requirements of the individual case. The outer pane and the inner pane preferably each have a thickness of 0.5 mm to 5 mm, more preferably of 1 mm to 3 mm, most preferably of 1.6 mm to 2.1 mm. For example, the outer pane has a thickness of 2.1 mm and the inner pane a thickness of 1.6 mm. However, the outer pane or, in particular, the inner pane can also be thin glass with a thickness of, for example, 0.55 mm.
[0057] The composite pane comprises a thermoplastic intermediate layer. The thermoplastic intermediate layer preferably contains at least polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), thermoplastic polyurethane (PU), or mixtures or copolymers, for example block copolymers, or derivatives thereof, particularly preferably polyvinyl butyral (PVB), very particularly preferably polyvinyl butyral (PVB), and additives known to those skilled in the art, such as plasticizers.
[0058] The thickness of the thermoplastic intermediate layer is preferably from 0.2 mm to 2 mm, particularly preferably from 0.3 mm to 1 mm, for example 0.38 mm or 0.76 mm.
[0059] According to the invention, the extrusion device comprises a support that is in contact with the lower surface of the extrusion die head. Furthermore, when a disk having a first surface, a second surface, and a side edge arranged between the first surface and the second surface is arranged edge-side in the recess of the extrusion die head of the extrusion die, the support is in contact with the first surface of the disk. The support is not particularly limited as long as it is suitable for supporting and / or securing the disk. Supports known to those skilled in the art can be used. Preferably, the support comprises a table. More preferably, a frame suitable for receiving a disk is arranged on the table. Particularly preferably, the frame has a curvature in the contact region with the disk that corresponds to the curvature of the disk.
[0060] In a preferred embodiment, the support comprises a layer made of an elastic material, wherein the layer made of an elastic material is in contact with the lower surface of the extrusion die head and, when a disk having a first surface, a second surface and a side edge arranged between the first surface and the second surface is arranged on the edge side in the indentation of the extrusion die head of the extrusion die, the layer made of an elastic material is in contact with the first surface of the disk. This layer made of an elastic material serves, on the one hand, as a buffer between the disk and other components of the support, such as the table or the frame. On the other hand, the layer made of an elastic material enables good sealing in the region of contact with the first surface of the disk and with the lower surface of the extrusion die head.In particular, in this embodiment, the contact between the layer of an elastic material and the first surface of the disc or the lower surface of the extrusion die head is maintained throughout the entire application of the profile strand in an extrusion process, so that a profile strand can easily be produced which is flush with the first surface of the disc over the entire area in which it was applied to the disc.
[0061] The elastic material of the elastic material layer is not particularly limited. For example, the elastic material may comprise or consist of at least one of silicone, ethylene propylene diene rubber (EPDM), a thermoplastic elastomer (TPE) such as TPV (thermoplastic vulcanizate) or TPS (thermoplastic styrene block copolymer), and polytetrafluoroethylene (PTFE). For example, PTFE may constitute an outer layer of the elastic material layer, wherein the outer layer is in contact with the first surface of the disc and with the lower surface of the extrusion die head.
[0062] The support preferably comprises the above-mentioned table, the above-mentioned frame, and the above-mentioned layer of elastic material. More preferably, the layer of elastic material is arranged on the frame at least in the region of the side edge of the disc. Even more preferably, the layer of elastic material extends from this region further along the first surface of the disc and along the lower surface of the extrusion die head, preferably by at least 9 mm in each case, more preferably by at least 10 mm in each case, in both directions, starting from the side edge of the disc. The extrusion device preferably comprises a robot for holding (and guiding) the extrusion die. Furthermore, a control, in particular regulation, of a conveying quantity of the polymer that is extruded can be provided.Furthermore, a sensor can be provided for detecting a position and / or orientation of the pane and / or components thereof.
[0063] In one embodiment, the extrusion device comprises a compensating means arranged between the preferably present robot and the extrusion nozzle. The compensating means is suitable for compensating for path differences between the robot and the extrusion nozzle caused by any bending tolerances in the disc, if the disc is curved. The compensating means can, for example, be a spring or a means controlled by compressed air.
[0064] The extrusion device according to the invention can be used to produce glazing, preferably vehicle glazing, in particular windshield, or building glazing, which comprises a pane with a first surface, a second surface and a side edge arranged between the first surface and the second surface, and a profile strand, wherein the profile strand is arranged on the side edge of the pane and on the second surface of the pane and wherein the profile strand is flush with the first surface of the pane. In one embodiment, the profile strand comprises a lip arranged at the level of the second surface of the pane, facing away from the pane. The seal of the glazing is finally obtained by the curing of the polymer forming the extruded profile strand.
[0065] The invention further comprises a method for the continuous extrusion of a profile strand onto a disc, comprising at least
[0066] Providing the extrusion device according to the invention,
[0067] Providing a disc having a first surface, a second surface and a side edge arranged between the first surface and the second surface, and
[0068] Applying a polymer via the extrusion nozzle of the extrusion device to the side edge of the disc and to the second surface of the disc.
[0069] The method according to the invention is also referred to here as an "extrusion method." According to the invention, extrusion takes place continuously. This means that the extrusion die is moved in a feed direction during the process, thereby forming the profile strand. While the profile strand is formed along the side edge of the pane and on the second surface of the pane using the method according to the invention, the corner geometries of the resulting seal are preferably realized using a subsequent process step involving corner injection.
[0070] The embodiments described above in connection with the extrusion die and the extrusion device according to the invention also apply equally to the method according to the invention. This also includes the embodiments of the profile strand and the disc.
[0071] The polymer used in the process of the present invention is not particularly limited as long as it can be used for extrusion.
[0072] In one embodiment of the invention, the polymer comprises at least one of polyurethane, polyolefin such as polyethylene and polypropylene, polysulfide, polyepoxide, natural rubber, nitrile rubber (NBR), styrene-butadiene rubber, ethylene-propylene-diene rubber (EPDM), RTV (room temperature curing) silicone rubber, HTV (high temperature curing) silicone rubber, peroxide curing
[0073] Silicone rubber, addition-curing silicone rubber, polyacrylate, silane-modified polymer and thermoplastic elastomer (TPE).
[0074] A silane-modified polymer is composed of a polymer chain, a linking group, and a hydrolyzable silane unit. The polymer chain is preferably one of a polyether polyol, a polyester, a polycarbonate, a polyacrylate, a polyolefin, and a polyurethane. The linking group is preferably one of a carbamate, an alkyl group, and a urea group. The crosslinkable silane is preferably a dimethoxymethylsilyl group or a trimethoxysilyl group.
[0075] The thermoplastic elastomer (TPE) preferably comprises at least one of TPO (olefin-based thermoplastic elastomer), such as polypropylene (PP) and ethylene-propylene-diene rubber (EPDM), TPV (thermoplastic vulcanizate), TPU (urethane-based thermoplastic elastomer), and TPS (styrene-based thermoplastic block copolymer), such as a styrene-butadiene-styrene block copolymer (SBS). Preferably, the polymer is a thermoplastic elastomer. More preferably, the thermoplastic elastomer comprises polypropylene and ethylene-propylene-diene rubber (PP / EPDM). By using such a polymer in the method according to the invention, a seal that is flush with a surface of a window can be produced simply and cost-effectively.
[0076] The invention further encompasses the use of the extrusion die according to the invention for extruding a profile strand onto a pane of glass for producing vehicle glazing or building glazing. In a particularly preferred embodiment, the vehicle glazing is a windshield.
[0077] The various embodiments of the invention can be implemented individually or in any combination. In particular, the features mentioned above and those to be explained below can be used not only in the specified combinations, but also in other combinations or on their own, without departing from the scope of the present invention.
[0078] The invention is explained in more detail with reference to drawings and exemplary embodiments. The drawings are schematic representations and not to scale. The drawings do not limit the invention in any way. They show:
[0079] Fig. 1 is a view of an embodiment of the extrusion nozzle 1 according to the invention,
[0080] Fig. 2 is a further view of the embodiment of the extrusion nozzle 1 according to the invention shown in Fig. 1,
[0081] Fig. 3 is a further view of the embodiment of the extrusion nozzle 1 according to the invention shown in Figures 1 and 2,
[0082] Fig. 4 is a view of an embodiment of the extrusion device 100 according to the invention,
[0083] Fig. 5 is a further view of the embodiment of the extrusion device 100 according to the invention shown in Fig. 4, Fig. 6 is a representation of an embodiment of the method according to the invention for the continuous extrusion of a profile strand onto a disc 200 and
[0084] Fig. 7 is a view of a glazing 400 that can be produced with the present invention.
[0085] Figures 1 to 3 show views of an embodiment of the extrusion nozzle 1 according to the invention. The extrusion nozzle 1 comprises an extrusion nozzle body 2, wherein the extrusion nozzle body 2 has an extrusion nozzle head 3 at a first end 2a in an extension direction X and a connecting element (not shown) at a second end, wherein the extrusion nozzle head 3 has a lower surface 4 arranged perpendicular to the extension direction X, and an indentation 5 arranged in the extension direction X and adjacent to the lower surface 4 of the extrusion nozzle head 3, and a first extrusion nozzle opening 6 and a second extrusion nozzle opening 7, each arranged in a region of the extrusion nozzle head 3 adjacent to the indentation 5, wherein the indentation 5, starting from the first extrusion nozzle opening 6 and the second extrusion nozzle opening 7, is concave is trained.
[0086] In a plan view of the extrusion nozzle 1 in the feed direction V, the indentation 5 has the shape of a circular arc. The indentation 5 has a first end 5a and a second end 5b, wherein the first end 5a of the indentation 5 adjoins the lower surface 4 of the extrusion nozzle head 3 and, starting from the second end 5b of the indentation 5, a flat surface 8 extends in the direction in which the indentation 5 is concave.
[0087] As shown in Figure 3, the lower surface 4 has an L-shape in a bottom plan view of the extrusion nozzle 1. The L-shape comprises a long leg and a short leg. The short leg is arranged parallel to the feed direction V. The long leg borders the first end 5a of the recess 5.
[0088] Adjacent to the lower surface 4 is a further surface 11 which, starting from the lower surface 4, extends in the feed direction V. This further surface 11 comprises a first end 11a which is adjacent to the lower surface 4, and a second end 11b which is arranged opposite the first end 11a. The second end 11b of the further surface 11 is located in the extension direction X of the extrusion nozzle body 2 above a plane which runs through the lower surface 4. This means that the further surface 11, starting from the lower surface 4, runs wedge-shaped in the extension direction X. The dashed line shown in Figure 3 indicates the course of the side edge S of the disk in an extrusion process. The extrusion nozzle 1 and the side edge S of the disk are spaced apart from one another. The distance between the extrusion nozzle 1 and the side edge S of the disk is preferably at least 0.1 mm.
[0089] The first extrusion nozzle opening 6 is arranged in a region of the extrusion nozzle head 3 which is perpendicular to the lower surface 4 of the extrusion nozzle head 3 and adjacent to the lower surface 4 of the extrusion nozzle head 3.
[0090] The second extrusion nozzle opening 7 is arranged such that it is further away from the lower surface 4 of the extrusion nozzle head 3 than the first extrusion nozzle opening 6 in the extension direction X. The second extrusion nozzle opening 7 extends into a region of the extrusion nozzle head 3 that, starting from the lower surface 4 of the extrusion nozzle head 3, lies above the flat surface 8.
[0091] The extrusion nozzle 1 further comprises a first feed channel 9 and a second feed channel 10. The first feed channel 9 extends through the extrusion nozzle body 2 to the first extrusion nozzle opening 6 and the second feed channel 10 extends through the extrusion nozzle body 2 to the second extrusion nozzle opening 7.
[0092] The first extrusion nozzle opening 6 and the second extrusion nozzle opening 7 are arranged in the extrusion nozzle head 3 so that they are open in the direction opposite to the feed direction V.
[0093] Figures 4 and 5 show views of an embodiment of the extrusion device 100 according to the invention in the feed direction. In particular, Figure 4 shows the embodiment of the extrusion device 100 before the polymer or the extrudate exits through the first extrusion die opening 6 and the second extrusion die opening 7. Figure 5, on the other hand, shows the embodiment of the extrusion device 100 at the time when extrudate has already exited the first extrusion die opening 6 and the second extrusion die opening 7 and the profile strand is being formed accordingly. For simplicity of illustration, the second end of the extrusion die body with the connecting element and the mass-conveying means are not shown.
[0094] The extrusion device 100 comprises the extrusion nozzle 1 shown in Figures 1 to 3 according to an embodiment of the invention, a mass-promoting means (not shown) connected to the extrusion nozzle 1, and a support 101 in contact with the lower surface 4 of the extrusion nozzle head 3. A disc having a first surface, a second surface, and a side edge arranged between the first surface and the second surface is arranged edge-side in the recess 5 of the extrusion nozzle head 3. The first surface of the disc is arranged flush with the lower surface 4 of the extrusion nozzle head 3. The support 101 is in contact with the first surface of the disc.
[0095] In the embodiment shown, the disc is a composite disc 300 comprising, in the following order: an outer disc 301 having an outer surface I and an inner surface II, a thermoplastic intermediate layer 302, and an inner disc 303 having an outer surface III and an inner surface IV, wherein the outer surface I of the outer disc 301 corresponds to the first surface of the disc. Accordingly, the outer surface I of the outer disc 301 is in contact with the support 101 and is arranged flush with the lower surface 4 of the extrusion die head 3.
[0096] Preferably, the distance between the extrusion nozzle 1 and the disk is at least 0.1 mm. In particular, in the embodiment shown in Figures 4 and 5, there is a gap between the inner surface IV of the inner disk 303 and the extrusion nozzle 1 and the side edge of the disk and the extrusion nozzle 1.
[0097] Preferably, the mass-promoting means (not shown) is connected to the extrusion nozzle 1 via the connecting element (not shown).
[0098] Figure 6 shows an illustration of an embodiment of the method according to the invention for the continuous extrusion of a profile strand onto a disc 200. The method according to the invention for the continuous extrusion of a profile strand onto a disc 200 comprises at least providing the extrusion device 100 according to the invention,
[0099] Providing a disc 200 having a first surface 201, a second surface 202 and a side edge 203 arranged between the first surface 201 and the second surface 202, and
[0100] Applying a polymer via the extrusion nozzle 1 of the extrusion device 100 to the side edge 203 of the disc 200 and to the second surface 202 of the disc 200.
[0101] For ease of illustration, the second end of the extrusion nozzle body with the connecting element and the mass conveying means are not shown.
[0102] The extrusion nozzle 1 is moved in a feed direction V during the process, whereby the profile strand is formed.
[0103] Figure 7 shows a view of a glazing 400 that can be produced using the present invention. The glazing 400 comprises a laminated pane 300, which comprises, in the following order: an outer pane 301 with an outer surface I and an inner surface II, a thermoplastic intermediate layer 302 and an inner pane 303 with an outer surface III and an inner surface IV, and a profile strand 401 arranged on the side edge 304 of the laminated pane 300 and on the inner surface IV of the inner pane 303, wherein the profile strand 401 is flush with the outer surface I of the outer pane 301.
[0104] List of reference symbols
[0105] 1 extrusion nozzle
[0106] 2 extrusion die bodies
[0107] 2a first end of the extrusion die body
[0108] 3 Extrusion die head
[0109] 4 lower surface of the extrusion die head
[0110] 5 indentation
[0111] 5a first end of the indentation
[0112] 5b second end of the indentation
[0113] 6 first extrusion nozzle opening
[0114] 7 second extrusion nozzle opening
[0115] 8 flat surface
[0116] 9 first feed channel
[0117] 10 second supply channel
[0118] 11 additional areas
[0119] 11a first end of the further area
[0120] 11 b second end of the further area
[0121] 100 extrusion device
[0122] 101st edition
[0123] 200 slices
[0124] 201 first surface
[0125] 202 second surface
[0126] 203 side edge
[0127] 300 composite pane
[0128] 301 Outer pane 302 Thermoplastic interlayer
[0129] 303 inner pane
[0130] 304 side edge
[0131] I Outer surface of the outer pane
[0132] II Inner surface of the outer pane
[0133] III Outer surface of the inner pane
[0134] IV Inner surface of the inner pane
[0135] 400 glazing
[0136] 401 profile strand
[0137] S side edge of the disc
[0138] V feed direction
[0139] X Extension direction
Claims
Patent claims 1. Extrusion nozzle (1) for dispensing a profile strand, comprising: an extrusion nozzle body (2), wherein the extrusion nozzle body (2) has an extrusion nozzle head (3) at a first end (2a) in an extension direction (X) and a connecting element at a second end, wherein the extrusion nozzle head (3) comprises a lower surface (4) arranged perpendicular to the extension direction (X), and an indentation (5) arranged in the extension direction (X) and adjacent to the lower surface (4) of the extrusion nozzle head (3), and a first extrusion nozzle opening (6) and a second extrusion nozzle opening (7), each arranged in a region of the extrusion nozzle head (3) adjacent to the indentation (5), wherein the indentation (5), starting from the first extrusion nozzle opening (6) and the second extrusion nozzle opening (7), is concave.
2. Extrusion nozzle (1) according to claim 1, wherein the indentation (5) in a plan view of the extrusion nozzle (1) in the feed direction (V) comprises the shape of a circular arc.
3. Extrusion nozzle (1) according to claim 1 or 2, wherein the indentation (5) has a first end (5a) and a second end (5b), wherein the first end (5a) of the indentation (5) adjoins the lower surface (4) of the extrusion nozzle head (3) and, starting from the second end (5b) of the indentation (5), a flat surface (8) extends in the direction in which the indentation (5) is concave.
4. Extrusion nozzle (1) according to claim 3, wherein the first end (5a) of the indentation (5) represents a terminal edge of the extrusion nozzle (1) which, in a plan view of the extrusion nozzle (1) in the feed direction (V), is set back from the flat surface (8).
5. Extrusion nozzle (1) according to one of claims 1 to 4, wherein the first extrusion nozzle opening (6) is arranged in a region of the extrusion nozzle head (3) which is perpendicular to the lower surface (4) of the extrusion nozzle head (3) and adjacent to the lower surface (4) of the extrusion nozzle head (3).
6. Extrusion nozzle (1) according to claim 5, wherein the second extrusion nozzle opening (7) is arranged such that it is further away from the lower surface (4) of the extrusion nozzle head (3) than the first extrusion nozzle opening (6) in the extension direction (X).
7. Extrusion nozzle (1) according to one of claims 1 to 6, wherein the lower surface (4) has an L-shape in a plan view of the lower surface (4).
8. Extrusion nozzle (1) according to one of claims 1 to 7, wherein, adjacent to the lower surface (4), a further surface (11) is arranged, which extends from the lower surface (4) in the feed direction (V), wherein the further surface (11) comprises a first end (11a) adjacent to the lower surface (4) and a second end (11b) arranged opposite the first end (11a), wherein the second end (11b) of the further surface (11) is located above a plane passing through the lower surface (4) in the extension direction (X) of the extrusion nozzle body (2).
9. Extrusion nozzle (1) according to one of claims 1 to 8, wherein the first extrusion nozzle opening (6) and the second extrusion nozzle opening (7) are arranged in the extrusion nozzle head (3) such that they are open in the direction opposite to the feed direction (V).
10. Extrusion device (100) comprising the extrusion nozzle (1) according to one of claims 1 to 9, a mass-promoting means connected to the extrusion nozzle (1), and a support (101) in contact with the lower surface (4) of the extrusion nozzle head (3) of the extrusion nozzle (1), wherein the extrusion device (100) is configured to receive a disk (200) having a first surface (201), a second surface (202) and a side edge (203) arranged between the first surface (201) and the second surface (202) on the edge side in the indentation (5) of the extrusion nozzle head (3) of the extrusion nozzle (1), so that the first surface (201) of the disk (200) is arranged flush with the lower surface (4) of the extrusion nozzle head (3) and the support (101) is in contact with the first surface (201) of the disk (200).
11. Extrusion device (100) according to claim 10, wherein the disc (200) is a composite disc (300) comprising at least in the following order: an outer disc (301) having an outer surface (I) and an inner surface (II), a thermoplastic intermediate layer (302) and an inner disc (303) having an outer surface (III) and an inner surface (IV), wherein the outer surface (I) of the outer disc (301) corresponds to the first surface (201) of the disc (200).
12. Extrusion device (100) according to claim 10 or 11, wherein the support (101) comprises a layer of an elastic material, wherein the layer of an elastic material is in contact with the lower surface (4) of the extrusion nozzle head (3) and, when a disk (200) having a first surface (201), a second surface (202) and a side edge (203) arranged between the first surface (201) and the second surface (202) is arranged on the edge side in the indentation (5) of the extrusion nozzle head (3) of the extrusion nozzle (1), the layer of an elastic material is in contact with the first surface (201) of the disk (200).
13. A method for the continuous extrusion of a profile strand onto a disc (200), comprising at least Providing the extrusion device (100) according to one of claims 10 to 12, Providing a disc (200) having a first surface (201), a second surface (202) and a side edge (203) arranged between the first surface (201) and the second surface (202), and Applying a polymer via the extrusion die (1) of the extrusion device (100) to the side edge (203) of the disc (200) and to the second surface (202) of the disc (200).
14. The method according to claim 13, wherein the polymer is a thermoplastic elastomer.
15. Use of the extrusion nozzle (1) according to one of claims 1 to 9 for extruding a profile strand on a pane (200) for producing vehicle glazing, in particular a windshield, or building glazing.