Abstract
A fastening system having at least of an application agent which, when viewed in relation to a surface to which it is applied, forms a smooth adhesion surface, in particular, after curing, and a functional part which, on its side facing the adhesion surface, has a functional surface which can be secured to the adhesion surface in a releasable manner.
Claims
1. A fastening system, consisting at least of: an application agent which, when viewed in relation to a surface to which it is applied, forms a smooth adhesion surface; and a functional part which, on its side facing the adhesion surface, has a functional surface which can be secured to the adhesion surface in a releasable manner.
2. The fastening system according to claim 1, wherein the application agent is in the form of an adhesive strip.
3. The fastening system according to claim 1, wherein the application agent is applied to the surface in liquid form and forms the smooth adhesion surface after curing.
4. The fastening system according to claim 1, wherein the application agent can be removed from the surface again without leaving residue or can be painted over.
5. The fastening system according to claim 1, wherein the functional surface of the functional part is microstructured, and in that the microstructures interact substantially by means of Van der Waals forces with the adhesion surface of the cured application agent applied in a planar manner on the surface.
6. The fastening system according to claim 1, wherein the functional surface of the functional part consists of 15,000 to 55,000 adhesive elements per cm.sup.2 of the film surface.
7. The fastening system according to claim 1, wherein the functional surface of the functional part consists of 25,000 to 35,000 adhesive elements per cm.sup.2 of the film surface.
8. The fastening system according to claim 1, wherein the film-like functional part consists of a silicone material.
9. The fastening system according to claim 1, wherein the functional part is in the form of a film and, on its one film side, has the functional surface having the microstructures and, on its opposite additional film side, has a securing option for further components.
10. The fastening system according to claim 3, wherein the liquid, fast-curing application agent is based on the following, in each case individually or in combination: acrylate; silicone; polyurethane; rubber; lacquer and cellulose.
11. A sales set, at least consisting of at least one spraying device configured for applying a liquid, curing application agent and at least one film-like functional part having a functional surface having microstructures.
12. A method for attaching the fastening system of claim 3, having at least the following method steps: providing a sales set, at least consisting of at least one spraying device configured for applying the application agent and the functional part having the functional surface having microstructures; applying, by spraying, the liquid application agent onto the surface; allowing the application agent, being the spray coating, to cure so as to form a smooth adhesion surface; and attaching the functional part via microstructures of one functional surface to the adhesion surface of the cured application agent.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The fastening system according to the invention is explained in more detail below with reference to exemplary embodiments according to the drawing. In the drawings, which are schematic representations that are not to scale:
[0023] FIGS. 1 to 4 show the application process for a fastening system according to the invention on a rough surface in the temporal sequence of the application;
[0024] FIG. 5 shows a greatly magnified representation of the film-like functional part used according to FIG. 4 having individual microstructures;
[0025] FIG. 6 shows a sales set designed in the manner of a film pouch having an application agent, functional part and a further hook-shaped functional component;
[0026] FIG. 7 shows a plan view of a fastening system attached to rough, painted masonry, with additionally attached fastening hooks on the rear side of a rectangular functional part; and
[0027] FIG. 8 shows a fastening system equipped with transponder technology and fitted on one side of a human wrist.
DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION
[0028] FIG. 1 is a schematically simplified and greatly magnified side view of an object 10 having a rough surface 12 on an exposed upper side of the object 10. By way of example, an object 10 of this kind can be in the form of painted clinker masonry 14, as shown in FIG. 7.
[0029] FIG. 2 shows a conventional spraying device 16 during spray operation, i.e., liquid spray discharge 20 takes place via a spray nozzle 22 in a spray button 18 when said spray button 18 is pressed multiple times by hand. In a preferred embodiment, the can-like spraying device 16 consists of an application device for spray plasters, but it is also readily possible to use a rubber spray for applying a sprayable, synthetic rubber mixture or a commercially available paint can for applying a vehicle paint, such as a car paint.
[0030] In principle, a polymer solution is suitable as a spray coating which, after evaporation of the solvent, forms a spray coating 24 on the rough surface 12 according to the representation according to FIG. 3, the spray coating 24, after curing, forming a smooth adhesion surface 26 on its outer side facing away from the rough surface 12. The polymer material used is, inter alia, polyvinyl pyrrolidone, nitrocellulose, ethyl cellulose or poly(methyl acrylate isobutene monoisopropyl maleate) (as a so-called static copolymer). However, one or more silicone-acrylate polymers and one or more silicone ethers having one or more carrier agents, selected from the group of the linear, cyclic or branched alkanes or alkenes which are gaseous or liquid at room temperature, have also proven to be particularly suitable in a preparation. This preparation for a spray coating 24 can be provided with flame-retardant additives and allows for good film formation with a smooth surface and rapid drying or curing of the applied spray coating film 24.
[0031] A spray coating 24 formed in this way, as well as an alternative spray coating consisting of polyurethane or rubber materials, can be removed from the object 10 or from the rough surface 12 thereof again after curing without leaving residue, if necessary; unlike in the case of (car) paints, which remain permanently adhered to the object 10. In particular, when the polymers mentioned are used, ethyl acetate or water is often used as the solvent. In this respect, the spray coating 24 is self-curing, it being possible to facilitate the curing, i.e., the crosslinking, by means of UV light, heat input and introduction of additional crosslinkers.
[0032] As can be seen, in particular, in FIG. 3, the spray coating 24 can also be realized over a large area and, in particular, there is also the possibility of providing the cured, smooth spray coating 26 with color, for example a wall paint, which should preferably also lead to a smooth adhesion surface 26 in the manner of a lacquer. If necessary, the application agent itself can also have a paint which allows for a large degree of design freedom for the user in adaptation to an otherwise used wall paint. In particular, in the case of a large-area application of the application agent, there is the possibility of providing a plurality of functional parts 28 having the cured application agent at one location. A functional part 28 of this kind is shown magnified in FIG. 5. In particular, the functional part 28 consists of a thin film 30 made of silicone material, preferably polyvinyl siloxane. In particular, the film 30 has a thickness of 0.15 to 5 mm and, on the upper side of the film as part of the functional surface 32, there are 15,000 to 55,000, particularly preferably 25,000 to 35,000 adhesive elements 34 per cm.sup.2 of the film surface. The individual adhesive elements 34 are preferably all of the same design and an integral component of the film 30. Each adhesive element 34 has a stem part 36, which transitions on the base side into the surface of the film 30 and has a flat head part 38 on the head side, which head part is wider in diameter relative to the stem part 36. The planar head surfaces of each head part 38 form the upper end of the adhesive element 34 in a common plane parallel to the surface of the film 30 and the microstructures formed in this respect interact via the free head surface of each head part 38 by means of Van der Waals forces with the smooth adhesion surface 26 of the cured application agent applied in a planar manner on the surface 12 in the form of the spray coating 24.
[0033] Said functional part 28 according to FIG. 5 can be obtained during a so-called chill roll method, it also being possible to design the free head shapes differently, for example they could form a hexagonal cross section instead of a circle.
[0034] If the film 30 according to FIG. 5 is placed on the head and is brought into contact with the smooth adhesion surface 26, a fastening system as shown in FIG. 4 results, and this adherence takes place by means of adhesion between the free end faces of the adhesive elements 34 and the smooth surface or adhesion surface 26 of the spray coating 24. After overcoming this adhesive force, the functional part 28 can also be reversibly removed from the smooth adhesion surface 26 and, if necessary, the spray coating 24 can also be removed from the object 10 with its rough surface 12 as described without leaving residue. Furthermore, there is the possibility of allowing the spray coating 24 to remain in place and to be painted over if necessary.
[0035] As the representation according to FIG. 6 shows, a spraying device 16, for example, in the form of a spray can be accommodated in an openable film pouch as a tradeable sales set together with a rolled-up film 30 according to the representation according to FIG. 5 and with an additional fastening means, in this case in the form of a commercially available wall hook 42 made of plastics material. The film-like functional part 28 often has a protective film on its microstructured surface as well as on its adhesive rear side, which makes rolling up more difficult, and therefore the functional part 28 can also be designed in the form of individual patches (not shown). On a fastening plate 44, the wall hook 42 has the actual projecting hook part 46 and the fastening plate 44 is provided at the rear with an adhesive coating 48 which is covered by a lamination film (not shown in greater detail). In this case, the functional part 28 has a back layer on its rear side facing the fastening plate 44, for example in the form of a fluorinated plastics film, preferably consisting of PES, PET, etc., such that the adhesive coating 48 of the fastening plate 44 remains adhered to the functional part 28, even if said functional part consists of silicone material, which is particularly adhesive-repellent. Instead of this solution, the functional part 28 can also be self-adhesive, for example provided with adhesives based on acrylate, rubber or silicone. The adhesive layer that is then uncovered by means of an additional cover film can then readily be firmly connected to the fastening plate 44.
[0036] FIG. 7 shows, by way of example, an application in which a sales set according to FIG. 6 can be used as shown.
[0037] First, the painted clinker masonry 14 is provided with a spray coating 24 from the spraying device 16 in the form of the spray can. After the spray coating 24 has cured on the rough surface 12, which often takes less than one minute for spray plaster application but can also take multiple hours in the case of rubber application, the unrolled film 30 can optionally be cut to size on site using scissors and placed on the smooth adhesion surface 26 according to the representation according to FIG. 4. The adhesive force already mentioned then holds the film 30 in contact with the cured spray coating 24 on the masonry 14. Subsequently, the lamination film is removed and the wall hook 42 is adhered by its rear-side adhesive coating 48 to the then exposed upper side 50 (FIG. 4) of the film 30, which is then provided with an additional film-like back layer. If the wall hook 42 is to be removed from the wall 14 again, it is removed, together with the film 30, from the spray coating 24, which has cured on the wall, by being pulled off, and the spray coating 24 is subsequently removed without leaving residue from the surface 12 of the object 10, in this case in the form of the clinker masonry 14. If a plurality of such wall hooks 42 are provided in the sales set according to FIG. 6, with a corresponding quantity of film material 30 as well as sufficient spraying agent in the spray can 6, the above-described hook structure can be implemented on a building wall 14 again. It should be emphasized again at this point that the attachment of the wall hook 42 is only an example and a variety of other possible applications of the fastening are conceivable in practice.
[0038] By way of example, reference is made in this context to a medical application according to FIG. 8. In this connection, a spray coating 24 in the form of a commercially available spray plaster can be applied on the outer side of the wrist of a patient. In this case, the skin of the patient is to be regarded as the rough surface 12. It is self-evident that, if necessary, the coating can additionally or alternatively also be applied on the inner side of the wrist. After the spray plaster has cured on the skin, the film 30 can in turn be applied, which in the present application scenario has at least one transponder chip 52 by means of which retrievable patient data can be stored or which allows the relevant location of the patient to be determined. In this respect, the RFID technology required for this is also fully available in the field of medicine, if necessary. In this case too, the film 30 can be removed again without problems and the breathable spray plaster coating can easily be washed off without leaving residue. The film 30 having the relevant transponder 52 can then be used again. Other solutions with wearables of this kind are possible.
[0039] A variety of further possible applications for the fastening system are conceivable here, which has no equivalent in the prior art. For example, according to the representation according to FIG. 4, further functional components (not shown) can be attached as an integral component or as a separate component on the upwardly exposed surface of the functional component 28, as disclosed by way of example in DE 10 2021 005 460 and DE 10 2020 006 092.
