EP4010200B1 - Method for masking surfaces to be matted - Google Patents

Description

The invention relates to a method for masking surfaces to be matted. The invention also relates to a method for matting surfaces, which includes such a method for masking surfaces to be matted.

Methods for masking surfaces to be matted and methods for matting surfaces are known in numerous variations. These known methods can be used, for example, for masking and matting glossy painted surfaces of a vehicle and/or a vehicle component. In order to cover areas of the surface to be matted that are not to be matted, the surface to be matted is masked. In known methods, the surfaces to be matted are masked by means of film coating or screen printing methods. As a rule, either water-based paint materials or solvent-based paint materials are used to mask the surfaces to be matted. The use of water-based paint materials results in a long production time, since the masking layer thickness required to protect the areas that are not to be matted can only be achieved by repeated frequent printing processes (eg 20 times). When using solvent-based lacquer materials, the masking layer is removed after the irradiation, which is time-consuming. Since the solvent-based paint materials are not water-soluble, the solvent-based paint materials can only be removed using chemical aids due to their high adhesive strength.

From the EP 0 672 500 A2 discloses a method of matting a surface comprising the steps of providing a workpiece with a surface to be matted, masking the surface to be matted to cover areas not to be matted, and sandblasting the surface so that unmasked areas are matted. The surface to be matted is masked with water-soluble peelable lacquer using a pad printing process.

From the DE 199 15 948 A1 a method for matting a surface is known with the following steps: providing a workpiece with a surface to be matted, masking the surface to be matted in order to cover areas not to be matted, and irradiating the surface by means of sandblasting, so that areas that are not masked are matted, wherein the surface to be matted is masked with water-soluble peelable lacquer using a screen printing process.

From the EP 2 481 602 A1 a method for printing symbols, characters, words or decorations on surfaces of devices is known, which comprises a laser pre-printing step in which a surface of a device is treated with a laser only in a selected area to reproduce a desired print, and a coloring step comprising applying a coloring substance to the ablated selected area to obtain a desired colored print. For example, the process can be used to print plastic, metal, glass or ceramic components of washing machines, dishwashers, dryers, refrigerators, etc.

From the EP 1 197 530 A1 a screen-printable dispersion varnish is known which, as a dried varnish layer, is sandblast-resistant and contains a film-forming first substance and a second substance which improves the detachability of the varnish layer under the influence of water. In the case of the screen-printable dispersion varnish, the second substance is present in such a concentration that the varnish layer is water-soluble or water-dispersible or water-suspendable.

From the U.S. 7,563,382 B2 there is known a method of manufacturing a mask which endures long use and can be used to form an isolated pattern with a high aspect ratio. The method includes the following steps: applying an elastic material in the form of a liquid or paste with high accuracy to desired areas of a PZT plate material to be processed (PZT: lead zirconate titanate) to form a mask pattern, with the elastic material over a nozzle is applied and forms a soft layer of material after curing. A resin material such as epoxy, urethane and silicon is used as the elastic material. Subsequently, a hard material in the form of liquid or paste is applied to the soft material layer and cured to form a hard material layer. Metal paste such as silver paste, solder or the like can be used as the hard material. This produces a mask that includes the soft material layer and the hard material layer. A sandblasting process is then performed by spraying an abrasive grit jet onto the PZT sheet material on which the mask has been formed. In this case, a structure is produced in the PZT sheet material in which a plurality of piezoelectric bodies are arranged in a desired layout. The mask is then removed using a wet etching process.

The invention is based on the object of providing a method for masking surfaces to be matted and a method for matting surfaces with such a method for masking surfaces to be matted, which allows a simple and quick application of the masking to the surface to be matted and a Allows easy and quick removal of the masking from the frosted surface and the creation of various optical effects.

This object is achieved by a method for masking surfaces to be matted with the features of patent claim 1 and by a method for matting surfaces with the features of patent claim 5 solved. Advantageous configurations with expedient developments of the invention are specified in the dependent patent claims.

In order to provide a method for masking surfaces to be matted, which allows the masking to be applied easily and quickly to the surface to be matted, and the masking to be removed from the matted surface easily and quickly, and various optical effects to be created, at least one is not required matting area of the surface to be matted of a provided workpiece is masked with a first layer of a first lacquer material. Then the same area that is not to be matted is masked with a second layer of a second lacquer material. In this case, the first paint material is designed in such a way that the first layer can be easily detached from the surface. The second paint material is selected and applied in such a way that the second layer has a high level of resistance to a blasting medium jet of abrasive material, which is higher than the resistance of the first layer. Furthermore, the first paint material is a water-based paint. The second paint material is a solvent based paint. Masking with a first layer of water-based paint and a second layer of solvent-based paint with high resistance compared to masking with a purely water-based paint has the advantage that the layer thickness can be chosen to be higher with solvent-based paints and is therefore sufficient Significantly fewer application processes, for example only one printing process instead of several printing processes, in order to achieve the required layer thickness for the masking. Compared to masking with a purely solvent-based paint, applying the first layer of water-based and therefore water-soluble paint allows the entire masking to be easily removed, since the separating layer and thus the second layer of solvent-based paint applied over it can be removed more easily with water . The solvent-based paint can be cured, for example, by means of an additional drying process under UV light or simply by means of air drying or by other suitable methods. Here, in at least one masking job, a high second Layer thickness of the second layer achieved, which is higher than the first layer thickness of the first layer. The second layer thickness can be thicker than the first layer thickness by a factor of 2 to 4, for example. As a result, only two application processes are required in order to apply the masking with a sufficient overall protective layer to the surface to be matted.

Advantageously, the easily removable first layer acts as a "separation layer" allowing easy removal of the entire mask, and the overlying second layer, having greater resistance to a blast of abrasive material, acts as a "protective layer" during surface blasting a blasting jet of abrasive material and can be applied with at least one application process. Various optical effects can be created by masking the surface to be matted.

Furthermore, a method for matting surfaces is proposed with the following steps: providing a workpiece with a surface to be matted, areas of the surface not to be matted being masked with such a method for masking surfaces to be matted, and blasting the surface with a blasting medium jet made of abrasive material so that unmasked areas of the surface are matted.

In a further advantageous embodiment of the method according to the invention for masking surfaces to be matted, the first layer and/or the second layer can be masked by means of a pad printing method. A silicone pad of a pad printing system can be partially coated with the first paint material or the second paint material, with the coated silicone pad printing the at least one area of the surface that is not to be matted with the first paint material or the second paint material. This means that the silicone tampon is partially coated with the first lacquer material to apply the first layer and partially with the second to apply the second layer Paint material is coated. The pad printing process has the advantage that automated masking of convex, flat and concave surfaces is possible, resulting in lower process costs.

In an advantageous embodiment of the method according to the invention for matting surfaces, the second layer thickness of the second layer can be applied so high that the second layer is not completely removed during blasting with the abrasive material and the underlying areas of the surface that are not to be matted are not matted .

In a further advantageous embodiment of the method according to the invention for matting surfaces, the first layer and the second layer can be removed and/or peeled off the surface after blasting with the abrasive material. Due to the first layer acting as a separating layer, the entire masking can be removed from the matted surface with pure water or with water and light chemical additives. This has an advantageous effect with regard to occupational safety and environmental protection. In addition, the simple cleaning makes it possible for the cleaning process to be carried out mechanically and therefore faster than by hand.

The advantages and preferred embodiments described for the method according to the invention for masking surfaces to be matted also apply to the method according to the invention for matting surfaces.

The features and combinations of features mentioned above in the description and the features and combinations of features mentioned below in the description of the figures and/or shown alone in the figures can be used not only in the combination specified in each case, but also in other combinations or on their own, without going beyond the scope of the leave invention. It is therefore also to be regarded as included and disclosed by the invention that are not explicitly shown in the figures are shown or explained, but result from the explained explanations and can be generated by separate combinations of features.

Fig. 1

ein schematisches Ablaufdiagramm eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens zum Maskieren von zu mattierenden Oberflächen,

Fig. 2

ein schematisches Ablaufdiagramm eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens zum Mattieren von Oberflächen, und

Fig. 3

eine schematische Schnittdarstellung eines Werkstücks mit einer zu mattierenden Oberfläche, welche mit dem Verfahren zum Maskieren von zu mattierenden Oberflächen aus Fig. 1 maskiert wurde.

Embodiments of the invention are shown in the drawing and are explained in more detail in the following description. In the drawing, the same reference symbols denote components or elements that perform the same or analogous functions. Here show:

1

a schematic flowchart of an embodiment of a method according to the invention for masking surfaces to be matted,

2

a schematic flowchart of an embodiment of a method according to the invention for matting surfaces, and

3

a schematic sectional view of a workpiece with a surface to be matted, which is made with the method for masking surfaces to be matted 1 was masked.

How out 1 and 3 As can be seen, the illustrated exemplary embodiment of the method 100 according to the invention for masking surfaces 3 to be matted comprises a step S100 in which a workpiece 1 with a surface 3 to be matted is provided. In step S110, at least one area 5 of the surface 3 that is not to be matted is masked with a first layer S1 made of a first lacquer material. In step S120, the same area 5 that is not to be matted is masked with a second layer S2 of a second lacquer material. In this case, the first lacquer material is designed in such a way that the first layer S1 can be easily detached from the surface 3 . The second paint material is selected and applied in such a way that a high resistance of the second layer S2 is achieved, which is higher than the resistance of the first layer S1. An embodiment of a masked workpiece 1 is in 3 shown.

How out 2 As can be seen, the illustrated exemplary embodiment of method 200 according to the invention for matting surfaces 3 includes, in addition to steps S100 to S120 of method 100 according to the invention for masking surfaces 3 to be matted, a step S200 in which the masked surface 3 to be matted is sprayed with a blasting agent jet abrasive material is irradiated, so that the unmasked areas to be matted 7 of the surface 3 are matted. The irradiation of the surface 3 to be matted, carried out in step S200, is carried out until a desired degree of matting is achieved. In a step S210, the first layer S1 and the second layer S2 are removed and/or peeled off the matted surface 3 after blasting with the abrasive material. Pure water or water and light chemical additives are preferably used to remove the mask.

How out 3 It can also be seen that the workpiece 1 shown in the exemplified section has a colored lacquer layer with three areas 5 not to be matted, which are masked by the method 100, and with two areas 7 to be matted, which are not masked, as the surface 3 to be matted . How out 3 It can also be seen that a second layer thickness D2 of the second layer S2 in the illustrated exemplary embodiment is at least twice as thick as a first layer thickness D1 of the first layer S1. Of course, larger or smaller factors can also be specified for the difference between the two thicknesses D1, D2. In this case, the second layer thickness D2 of the second layer S2 is applied so high that the second layer S2 is not completely removed during the blasting with the abrasive material and the underlying areas 5 of the surface 3 that are not to be matted are not matted.

In the illustrated exemplary embodiments, a water-based paint is used as the first paint material and a solvent-based paint with a higher resistance is used as the second paint material. In this case, the masking of the first layer S1 and/or the second layer S2 preferably takes place by means of a pad printing process. For this purpose, to apply the first layer S1 a first silicone pad of a multi-color pad printing system partially coated or printed with the first coating material. Subsequently, the at least one area 5 of the surface 3 that is not to be matted is coated with the second lacquer material by the silicone pad. To apply the second layer S2, a second silicone pad of the multicolor pad printing system is partially coated with the second paint material. Then the at least one area 5 of the surface 3 that is not to be matted or the applied first layer S1 is coated or printed with the second lacquer material by the second silicone pad. The pad printing process not only masks flat surfaces 3 to be matted, but also convex or concave surfaces to be matted.

REFERENCE LIST

1

workpiece

3

surface to be matted

5

area not to be matted

7

area to be matted

S1

first layer

S2

second layer

D1

first layer thickness

D2

second layer thickness

100

Process for masking surfaces to be matted

200

Process for matting surfaces

S100 to S210

process step

Claims (7)

1. Method for masking surfaces (3) to be matted, having the following steps:

   providing a workpiece (1) having a surface (3) to be matted;

   masking at least one region (5), not to be matted, of the surface (3) with a first layer (S1) of a first coating material which is a water-based coating,

   masking the same region (5), not to be matted, with a second layer (S2) of a second coating material which is a solvent-based coating,

   wherein the first coating material is designed such that the first layer (S1) can be easily detached from the surface (3), wherein the second coating material is selected and applied such that high resistance of the second layer (S2) to a jet of abrasive material is achieved, said resistance being higher than the resistance of the first layer (51),

   wherein in at least one masking application a high second layer thickness (D2) of the second layer (S2) is achieved which is higher than a first layer thickness (D1) of the first layer (51).
2. Method (100) according to claim 1,
   characterised in that
   the second layer thickness (D2) is thicker than the first layer thickness (D1) by a factor of 2 to 4.
3. Method (100) according to claim 1 or 2,
   characterised in that
   the masking of the first layer (S1) and/or the second layer (S2) is carried out by means of a pad printing method.
4. Method (100) according to claim 3, characterised in that a silicone pad of a pad printing machine is partially coated with the first coating material or the second coating material, wherein the coated silicone pad prints the first coating material or the second coating material on the at least one region (5), not to be matted, of the surface (3).
5. Method (200) for matting surfaces, having the following steps: providing a workpiece having a surface to be matted, wherein regions (5), not to be matted, of the surface (3) are masked,

   blasting the surface (3) with a jet of abrasive material so that non-masked regions (7) of the surface (3) are matted,

   characterised in that

   the regions (5) of the surface (3) which are not to be matted are masked by means of a method according to any one of claims 1 to 4.
6. Method (200) according to claim 5,
   characterised in that
   the second layer thickness (D2) of the second layer (S2) is applied to such an extent that the second layer (S2) is not completely stripped during the blasting with the abrasive material and the underlying regions (5) of the surface (3) which are not to be matted are not matted.
7. Method (200) according to claim 5 or 6,
   characterised in that
   the first layer (S1) and the second layer (S2) are removed and/or peeled off from the matted surface (3) after being blasted with the abrasive material.

Images