ES2849623T3 - Multi-layer security device - Google Patents

Abstract

Multi-layer safety device (1) with a. a transparent substrate (2), b. a multilayer security foil (4) having several layers (9) of a synthetic material, the security foil (4) being fixed to the substrate (2), c. a hard coating (5) arranged on an outer side, opposite the substrate (2), of the security sheet (5), d. an edge seal (6) that seals at least outer edges of the multilayer security foil (4), characterized in that the edge seal (6) ends, in the thickness direction (7), flush with the outer surface of the hard coating (5) and with the outer surface of the substrate (2).

Description

DESCRIPTION

Multi-layer security device

The invention relates to a multilayer security device.

A multilayer security device in the form of safety glass is known from DE69516231T2. A complex sheet of synthetic material with a layer of plasticized polyvinyl butyral (PVB) is applied to a glass substrate. Especially at low temperatures of 0 ° C or less, PVB becomes brittle. The use of PVB in a multilayer security device is disadvantageous. The complex sheet of synthetic material that serves to enhance the safety of the glass substrate can become detached from the glass substrate, especially in the event of improper handling. Other multilayer security devices were disclosed by WO2015 / 144127A1 and US2012 / 0070642A1.

The present invention has the objective of providing a multilayer security device that guarantees greater security, in such a way that the multilayer assembly is especially stabilized and an unintentional detachment of individual layers is avoided.

This objective is achieved according to the invention by means of a multilayer security device with the characteristics indicated in claim 1.

According to the invention, it was found that in a multilayer security device with a multilayer protective foil, an edge sealing of at least the outer edges prevents individual layers from detaching from the security foil. In this way, unintentional damage and / or destruction of the security foil is avoided. In this way, they increase the stability and reliability of the security device as a whole. In particular, it was found that the exposed edge areas of the multilayer security sheet can lead to damage to the security device. Due to the fact that the exposed edges of the layers of the security foil are sealed with the edge sealing, immediate mechanical action on the edges, for example manually and / or by means of a tool, is prevented. The edges are protected by the edge sealing, especially also against the elements. The multi-layer security device is basically suitable for outdoor use. It is particularly advantageous to use the multilayer security device in such a way that the security foil is arranged on one side, facing the interior space, of the security device. The multilayer security foil is arranged especially on the inner side of the transparent substrate, being specially glued on it. The multi-layer safety device is especially a safety glass with a chipping protection function. The multilayer security foil is arranged on a transparent substrate. The substrate is especially a moon and especially a glass pane. The moon is especially a movable, especially retractable window, such as a side window window of a car. Due to the descent of the moon, the upper edge of the moon is exposed with the safety sheet arranged on it. By sealing the edges, the security foil and the substrate form a closed, indestructible unit. Removal of the security sheet from the substrate is effectively prevented.

Advantageously, all circumferential edge regions of the security foil can be sealed to the substrate with an edge seal. The essential thing is that the edge areas that are exposed at least temporarily and / or at least in areas by the displacement of the glass are sealed by the edge sealing. A particularly economical embodiment of the safety device is achieved by the fact that with the edge sealing only the edge areas of the safety foil that could be exposed by a displacement of the window are sealed. In particular, it is possible, for example, to do without creating an edge seal, for example, the lateral edge areas of the security foil that are arranged in the vertical guide of the window frame, and / or a lower edge area of the window, which is durably arranged in the window housing of the automobile door.

The window can be made flat or curved. The transparent substrate can also be a synthetic material window. The multilayer security foil comprises several layers of a synthetic material. In particular, the security foil is PVB-free. A hard coating is provided on an outer side, opposite the substrate, of the security foil. In this way, it is ensured that the multilayer security foil is made resistant to scratching and abrasion. The hard coating is made in particular on the basis of a polyorganosiloxane. The hard coating is especially an acrylate-based material, especially an acrylate that cures under UV radiation with light in a wavelength range between 10 and 380 nm.

A security foil according to claim 2 has been found to be particularly strong. The especially four layers of the security foil are specially glued together. In particular, two adjoining layers are each glued to one another. Between four layers, for example, three layers of adhesive are arranged. The number of layers is in particular between two and twenty-five.

The production of the layers according to claim 3 has proven to be especially advantageous for use as protection sheet against chipping. Experiments of the patent applicant showed that the synthetic material used exhibits such toughness that it is placed around the chips of the substrate, especially around the glass chips formed with especially sharp edges, encapsulating the individual chips. In this way, unlike the splinter protection films according to the prior art, it is possible to prevent sharp-edged glass chips from severing the protection film. The material for the layers of the protection sheet is especially a urethane-based thermoplastic elastomer (TPU), especially polyester and / or a TPU sheet and / or an EVA sheet. EVA corresponds to a copolymer of ethylene and vinyl acetate. In particular, several layers of identical thickness are produced. In particular, all the layers have an identical layer thickness. The layer thickness is advantageously between 0.01 mm and 0.5 mm, in particular between 0.02 mm and 0.4 mm, in particular between 0.05 mm and 0.2 mm, in particular between 0 .08 mm and 0.12 mm and especially 0.1 mm.

An embodiment of the security foil according to claim 4 has a higher strength. Due to the fact that the adjoining layers are glued together with a layered adhesive, the security foil is stable in itself. The layering adhesive is made especially based on acrylate. Layer adhesive is especially self-adhesive, especially a contact adhesive. The layer adhesive is made especially as a PSA adhesive. The layer adhesive has a layer thickness that is less than the layer thickness of the individual layers. In particular, the layer thickness is 0.005 mm to 0.05 mm, especially 0.01 mm to 0.03 mm, especially 0.015 mm to 0.025 mm, and especially 0.02 mm.

The prestressed layers of the security foil according to claim 5 allow an improved absorption of the action of a force from outside, especially by the impact of an object such as a stone or a hammer or a projectile of a firearm. In particular, the individual layers are unidirectionally prestressed, that is, along one direction. It is advantageous to arrange the unidirectionally prestressed layers in such a way that the directions of the unidirectional prestresses differ from each other and are oriented in particular perpendicular to each other. In particular, the directions of the prestressing of adjacent layers of the security foil differ. It is also possible that the layers are pre-stressed biaxially, that is, on two axes. It is also possible to combine monoaxially and biaxially prestressed layers together to form a security foil.

An embodiment of the security device according to claim 6 is especially stable. The security sheet is reliably attached to the substrate. The layer thickness of the substrate adhesive is especially identical to the layer thickness of the layer adhesive. Especially, the layer thickness of the substrate adhesive amounts to 0.005 to 0.05 mm, especially 0.01 mm to 0.03 mm, especially 0.015 mm to 0.025 mm, and especially 0.02 mm. The substrate adhesive is especially an acrylate-based adhesive, especially an acrylate adhesive.

An embodiment of the layers according to claim 7 allows edge sealing which is advantageous because it can be carried out with a reliable manufacturing technique and which is therefore robust. With the sloping edges, the layers advantageously adhere to the substrate, which is particularly round. A gap between the security foil and the substrate is avoided.

Such a gap could be the starting point for the peeling of the sheet. The bond between the substrate and the multilayer security foil is improved in this way. The risk of unintentional separation of the security foil from the substrate by protruding edges is excluded.

An edge seal according to claim 8 allows an uncomplicated and quick application of the seal.

An edge seal according to claim 9 allows an extension of the seal to the substrate and / or the hard coating.

An edge seal according to claim 10 has high strength. The individual layers of the safety device are mechanically held together and especially are joined to one another by bonding materials.

An exemplary embodiment of the invention is described in detail below with the aid of the drawing. In this, they show:

figure 1 a schematic representation in cross section of a multilayer security device according to the invention,

figure 2 an enlarged detail view according to detail II in figure 1,

figure 3 a representation of a safety device, corresponding to figure 1, according to another example of embodiment,

Figure 4 an enlarged detail view according to detail IV in Figure 3.

A multilayer security device designated by 1 as a whole in Figures 1 and 2 comprises a glass pane as a transparent substrate 2, a multilayer security sheet 4 fixed to the substrate 2 by means of a substrate adhesive 3 and a hard coating 5 arranged on the outer side of the security foil 4.

The exposed edges of the substrate 2, the substrate adhesive 3, the security foil 4 and the hard coating 5 are sealed by an edge seal 6. The edge seal 6 reliably covers the free surfaces on the respective front sides on the substrate 2, on the substrate adhesive 3, on the security foil 4 and on the hard coating 5. These edge areas on the front surface are protected by edge sealing 6. The edge sealing 6 is made of such that in the thickness direction 7 it ends flush with the multilayer assembly, that is, it does not protrude from the outer surface of the hard coating 5 or from the outer surface of the substrate 2, in the thickness direction 7.

The edge sealing 6 extends in particular to all edge areas of the safety device 1, which during application of the safety device 1 are exposed at least in areas and / or at least temporarily. Edge sealing 6 can be dispensed with in the protected edge areas of the safety device 1.

What is essential is that the edge sealing 6 extends at least in areas along the outer edges of the safety device 1. On a retractable window 2, for example on the driver's or passenger's door of a motorized vehicle, especially of a car, this is especially the upper edge of the safety device 1. The side edges and the lower edge of the unit 2 are guided in lateral guides or in the vehicle frame, thus being protected. The glass window 2 is in particular a car window that can be made in particular with a single or multiple curved shape.

The window 2 separates an interior area of the automobile, the passenger compartment, from an exterior environment. The cabin is arranged, according to FIG. 1, on the left side of the window. The outer zone is arranged on the right side of the window 2.

Applications are also possible in which more than one edge zone, especially the entire edge zone, ie circumferential, of the safety device 1 are realized with edge sealing 6.

The security foil 4 and the edge seal 6 are arranged on an inner surface, facing the passenger compartment of the car, of the window 2.

What is essential is that the material of the edge seal 6 is chosen in such a way that it can enter into a material bond with all the materials, the edge areas of which need to be sealed. In the present case, it is the material of the hard coating 5, the layers 9 of the layer adhesive 10, the substrate adhesive 3 and the substrate.

The outer edge surface 8 of the glass pane 2 is convexly curved. The glass pane 2 has a rounded edge surface 8, especially semicircular. The glass pane 2 has a thickness D2 which is between 1 mm and 10 mm, especially between 2 mm and 8 mm, especially between 2.5 mm and 6 mm, especially between 3 mm and 5 mm, especially at between 3.5 mm and 4.5 mm, and especially at 4 mm.

The substrate adhesive 3 has an especially substantially constant layer thickness D3 of 0.02 mm. In an upper zone facing the edge sealing 6, the layer with the substrate adhesive 3 is made substantially wedge-shaped, in such a way that the interior space between the security foil 4 and the glass pane 2 is completely filled. In the upper area, the interior space is made widening in a wedge-like manner due to the curved edge surface of the glass pane.

The substrate adhesive 3 allows rapid surface hardening, especially under UV radiation. The substrate adhesive is acrylate based. No secondary hardening is required. The substrate adhesive has a hardness of Shore D 60 to 75, especially Shore D 65 to 70. The substrate adhesive has a viscosity of not more than 6,000 mPas, especially of not more than 5,500 mPas.

The security film 4 has four layers 9 which, according to the illustrated embodiment, are made of polyester and TPU films. The layers 9 each have a layer thickness Dg of 0.1 mm.

The layers 9 of the security foil 4 can also have different layer thicknesses Dg. In particular, it is possible that adjacent layers 9 have different layer thicknesses. In particular, it is also possible that all the layers 9 each have layer thicknesses that are different from each other, that is to say that all the layers 9 differ from each other with respect to their layer thickness D9.

Layers 9 are specially made from thermoplastic materials, from polyester materials, from polyurethane materials, polycarbonate materials, crystalline polyethylene terephthalate (CPET) materials and / or polyethylene terephthalate (PBT) materials.

Two adjacent layers 9 are respectively glued together with an acrylate-based layer adhesive 10. The layer thickness D10 of the layer adhesive 10 is 0.02 mm.

The respective layer thickness D10 of the layer adhesive 10 can be determined in various ways. In particular, the layer thickness D10 of the different layers of the layer adhesive 10 can be chosen in different ways. In particular, the layer thicknesses D10 of the different layers of the layer adhesive 10 differ. The exposed edges of the layers 9 are beveled with an angle of inclination n relative to the thickness direction 7. According to the illustrated embodiment, the angle of inclination amounts to approximately 70 °. The angle of inclination n in particular is designed in such a way that the edge seal 6 can be attached particularly advantageously to both the glass pane 2, on the one hand, and the security foil 4, on the other hand.

The layers 9 are in particular arranged offset from one another such that they are arranged in an aligned manner along the inclined direction of the exposed edges. The exposed edges of the layers 9 form a common beveled edge. It is particularly advantageous if the layers of the layered adhesive 10 and the substrate adhesive 3 are also correspondingly bevelled. The security foil 4 as a whole is beveled with the angle of inclination n and has a common closed surface. The connection to the edge seal 3 is improved, but in particular a closed contact surface of the edge seal 6 can be formed. In particular, the inclination of the security foil 4 is oriented in such a way and arranged relative to the glass pane. 2 in such a way that the sloping upper side forms a tangent to the outer edge surface 8 of the glass pane 2. In this way, an edge-free transition between the glass pane 2 and the security foil 4 is ensured.

The hard coating 5 is applied especially directly on the outer surface of the security foil 4, especially on the layer 9 opposite the substrate 2. The hard coating 5 has a layer thickness D5 between 1 µm and 10 µm.

Edge seal 6 is in particular an adhesive that cures under UV light, especially UV radiation with a wavelength of 265 nm. Adhesives that cure in other wavelength ranges are also possible. It is also possible that the adhesive hardens under heat and / or under chemical crosslinking. Next, with reference to Figures 3 and 4, a second embodiment of the invention is described. Parts of identical construction receive the same reference marks as in the first embodiment, to which reference is therefore made. Parts of different, but functionally identical construction receive the same reference signs with a postponed a.

The essential difference from the first embodiment is that the security foil 4a is arranged with a marginal distance D ^r on the transparent substrate 2. In the region of the marginal distance D ^r, the transparent substrate 2 is exposed. According to the illustrated embodiment, the marginal distance D ^r is 1 cm. Depending on the application, the marginal distance D ^r can also be more than 1 cm or less than 1 cm.

The marginal distance D ^r is defined as the distance from the edge seal 6a to the outer edge surface 8 of the substrate 2.

Another difference is that the free edges of the layers 9 are made without inclination, that is to say that the angle of inclination n amounts to 0 °.

By the marginal distance D ^r an exposed marginal zone is defined which is designated by the reference sign 11 in figure 3. The marginal zone 11 can extend along a single outer edge of the substrate 2. But the marginal zone 11 It can also extend over several, especially interconnected, edge areas of the substrate 2. The marginal area 11 can be made in particular circumferentially on the substrate 2. It is also possible that the marginal area 11 extends only by zones along one edge of the substrate 2.

Claims (11)

1. Multilayer safety device (1) with to. a transparent substrate (2), b. a multilayer security sheet (4) having several layers (9) of a synthetic material, the security sheet (4) being fixed to the substrate (2), c. a hard coating (5) arranged on an outer side, opposite the substrate (2), of the security foil (5), d. an edge seal (6) that seals at least outer edges of the multilayer security foil (4), characterized in that the edge seal (6) ends, in the thickness direction (7), flush with the outer surface of the hard coating (5) and with the outer surface of the substrate (2). Security device according to claim 1, characterized in that the security foil (4) has at least two layers (9) and at most twenty-five layers (9), in particular four layers (9). Safety device according to one of the preceding claims, characterized in that the layers (9) are made from thermoplastic materials, especially polyurethane materials, polycarbonate materials, crystalline polyethylene terephthalate materials, polyethylene terephthalate materials and / or made of polyester materials, in particular having polyester and being made especially as polyester and / or with TPU sheets and / or with EVA sheets. Safety device according to one of the preceding claims, characterized in that the adjacent layers (9) are glued together by means of a layer adhesive (10), especially based on acrylate. Safety device according to one of the preceding claims, characterized in that the layers (9) each have a prestressing in a plane, which is oriented perpendicular to the thickness direction (7) of the layers (9), the prestressing of at least two layers (9) differing in terms of value and / or direction. Security device according to one of the preceding claims, characterized in that the security foil (4) is glued to the substrate (2) with a substrate adhesive (3). Safety device according to one of the preceding claims, characterized in that each of at least one outer edge of the layers (9) is made inclined at an angle of inclination (n) relative to the thickness direction ( 7) of the layers (9). Safety device according to one of the preceding claims, characterized in that the edge seal (6) has a hardenable adhesive which hardens in particular under irradiation of light, in particular in a wavelength range from 10 nm to 380 nm. Safety device according to one of the preceding claims, characterized in that the edge sealing (6) seals the substrate (2) and / or the hard coating (5). Safety device according to claim 9, characterized in that the edge seal (6) has a suitable material to be joined by bonding materials to each of the material of the substrate (2), of the layers (9), of the adhesive of layers (10), of the substrate adhesive (3) and / or of the hard coating (5). Security device according to one of the preceding claims, characterized in that the security device (1) is suitable for separating an interior space from an exterior region, the security foil (4) being arranged on the side, facing the interior space, of the safety device (1) and / or on the side, facing the outer zone, of the safety device (1).