DE29814711U1 - Multi-layer protective film and surface element with a wear-protected surface - Google Patents

Description

HVG05 T2,dQc

Multi-layer protective film and surface element with wear-resistant surface

The invention relates to a multilayer protective film consisting of a base film made of plastic and a wear layer, wherein the wear layer comprises at least one adhesive release film made of plastic.

Protective films made of plastic are used in many technical areas to protect sensitive surfaces. In some cases they only serve to protect products during transport/in some cases they also protect surfaces during use of a product.

The advantage is that damage, _e.g. caused by scratching objects, or soiling initially only affects the plastic film and leaves the underlying surface intact. By selecting a suitable bonding agent, the surface can be freed of the damaged or soiled film and covered with a new film. Since films with excellent transparency are available, transparent glass can also be coated with protective films.

The disadvantages, however, are the high amount of work involved in removing old, glued film coatings and the high demands on craftsmanship when applying them.

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of films in order to produce a wrinkle- and bubble-free film coating.

At the same time, plastic films have a lower surface hardness than glass, for example, which leads to increased wear on the film surface and a short service life. In certain areas of application, the dilemma arises of either foregoing the positive properties of a protective film or accepting frequent and time-consuming removal and re-bonding!

It is also known/ for example in the case of motorcycle helmet visors, to cover a pane with a number of film wear layers, whereby the adhesion of the films to each other and to the pane itself is achieved by electrostatic charging. It is therefore possible to peel off the damaged or dirty film on top and to obtain a new, clear and clean surface with the film next underneath.

The disadvantage of this solution is that only very thin films can be applied. With large-area film cuts and with two-axis curved surfaces of the object to be covered, the adhesion through electrostatic charge is not sufficient to create a bond that is completely wrinkle- and bubble-free and also durable. It has also been shown that when a top layer of film is removed from a known protective film, the adhesion of the next film layer underneath is impaired, so that several wearing layers can be unintentionally removed at the same time;

It is therefore the object of the invention/ in a multilayer protective film according to the preamble of claim 1/

to avoid the disadvantages mentioned above and to improve both the adhesion and the peelability of the films.

The object is achieved according to the invention by

- that between the base film and the wear layer and

between all release films within the wear layer

an adhesive layer is arranged*

- that the multi-layer protective film can be split manually in at least one edge force introduction area,

- that at least one release liner on top of the

wear layer can be removed while simultaneously completely removing the adhesion-promoting adhesive layer.

For better understanding, the surface of the protective film that can be applied to the object to be protected is referred to as the bottom surface and the film surface that faces freely into the room is referred to as the top surface;

In contrast to the electrostatic adhesion known from the prior art, in a multi-layer protective film of the invention, adhesive bonds are formed by the inserted adhesive layer. The adhesive strength of the release films is so great that accidental detachment of individual release films is prevented during use of objects coated with the protective film.

The surfaces of the release films are advantageously designed in such a way that at least one of the top release films of the wear layer can be removed while simultaneously completely removing the adhesion-promoting adhesive layer. The adhesive layer is therefore removed with the worn release film during peeling and the exposed release film has a clean surface.

The initiation of the peeling process is facilitated by the fact that the multi-layer protective film can be split manually in at least one edge-side force introduction area .

According to the present invention, the peel strength of each of the adhesive layers can be less than the maximum tensile strength of the adhesive layers, i.e. less than the maximum normal stress in the adhesive joint. When peeling, the entire force acts in a concentrated manner along one line, namely the transition from the area of the films that have already been separated from one another to the area that is still glued together . The resulting high loads due to shear and tensile stresses in the adhesive layer, coupled with extreme overstretching, lead to the adhesive layer breaking along the peeling line. The layers underneath, on the other hand, are not stressed to the limit. Since the limit of the elastic deformability of the layers underneath is also not reached when the top layer is peeled off, local stretching of the lower layers and associated changes such as bulging are also avoided.

The advantage here is that when a worn film is peeled off on top, a peel-off film underneath is exposed, but all other adhesive layers underneath the remaining protective film remain unaffected, since they are only subjected to normal stresses < The adhesive layer according to the invention can be subjected to normal stresses which are greater than the peel strength -.

All films underneath the worn film remain unaffected, as the peel strength of the adhesive layers is smaller than the limit of the elastic deformability of the films, i.e. the adhesive layer comes off before greater forces act on the remaining plastic film.

which could cause plastic deformation of the film materials -. &iacgr;

One embodiment of the invention provides for the contacting films to be free of adhesive layers in the force application area. The individual cases lying loosely on top of each other in this area can easily be grasped with the fingers and the peeling initiated, tools such as knives are advantageously not required for splitting.

Another form of a protective film according to the invention provides that an adhesion-reducing intermediate strip, in particular a strip-shaped silicone-coated paper or plastic film section, is inserted between two contacting films in the force introduction area. This also makes it easier to initiate the manual peeling process . There are also advantages in the production of a protective film, since each peel-off film can initially be coated over its entire surface with adhesive, and then a protective strip is inserted in the film production direction when the individual films are brought together.

It is proposed to provide at least one release film on the surface facing away from the base film with a scratch-resistant coating that increases the surface hardness. This significantly increases the service life of the protective film.

It is advantageous for at least one peel-off film to be provided with a dirt-repellent coating, in particular based on silicone or PTFE, on the surface facing away from the base film, which reduces the surface tension. Liquids, such as paint, that come into contact with the protective film roll off and the adhesion of dust particles is reduced*

The protective film can be used with liquid adhesives as assembly adhesives, for example a water-soluble acrylate

adhesive, to an object, as is known per se.

However, it is advantageous to provide the protective film with an adhesive layer during production. The adhesive layer can consist of microencapsulated, pressure-sensitive adhesives or of adhesives that must first be activated with moisture and/or heat.

IQ If an assembly adhesive layer is provided which is permanently sticky even at room temperature and in order to effectively prevent contamination before assembly, particularly in the case of transparent protective films, the assembly adhesive is advantageously provided with a cover film. ' ^:

The invention further relates to a surface element with a wear-protected surface;

Particularly with surface elements that are installed in a publicly accessible area, the problem of deliberate soiling and damage arises. Removing sprayed paint from a surface element is extremely difficult and can only be carried out with expensive manual work. Sharp or pointed objects can damage the surface element and possibly render it unusable, so that replacement is necessary.

It is therefore a further object of the invention to create a surface element that is protected against wear and tear due to long-term use and deliberate damage or soiling *

This task is solved by the following features:

- the surface element is coated with a film cut of a multilayer protective film, which comprises a base film and a wear layer consisting of at least one adhesive release film,

- the foil blank can be split manually in at least one edge-side force introduction area,

- at least one upper release film of the wear layer can be removed from the film cut by completely removing the adhesion-promoting adhesive layer,

- the surface element (200) is provided with a closure element (22, 22') which prevents access to the force introduction area (10)&iacgr;

It is advantageous that the surface element is protected according to the invention by an applied film cut of a protective film, which comprises a base film and a wear layer. The film cut is cut flush with the surface element and glued -. The base film can be single-layered or multi-layered and integrate other functions such as splinter protection, increased breaking strength or reduced solar radiation. By forming the wear layer in the form of peel-off films, it is possible according to the invention to remove a worn upper film layer together with the adhesive layer and obtain a new surface. The films only adhere weakly to one another in a force introduction area or lie next to one another unconnected, so that manual splitting of the film composite and thus the removal of a worn peel-off film is easily possible -, ^:

It is a significant advantage of the invention that the accidental or intentional removal of the etching foils from the surface element is prevented by the surface element

ment is provided with a locking element that prevents access to the force introduction area. Only after removing the locking element is the force introduction area exposed and the removal of individual peel-off films is possible*

Preferably, the film cut has a polygonal shape and a force introduction area is formed on at least one corner. With a rectangular cut, for example, a force introduction area is created in the form of a triangular pull tab that can be grasped with the fingers.

A simple production of a web-shaped protective film is made possible by the fact that a force introduction area is formed on at least one outer boundary line of the film cut, running essentially parallel to the boundary line. Another advantage here is that the peeling off of the uppermost peel-off film can take place evenly over the entire width of the film cut, \

The surface element is preferably a pane of glass, where damage and dirt are particularly disruptive, as the transparency is reduced and scattered light is created at the damaged areas» '

The surface element can also be a body panel, which is made in particular from a plastic panel or a metal sheet _{. In} this way, the bodies of railway carriages, buses or emergency vehicles of the police and fire brigade can be made wear-resistant.* The base film can already contain the paint.

It is also proposed that the surface element be enclosed in a frame. This means that the edge area of the protective film can be covered all around to such an extent that deliberate

&bull; * ■ · . · * · · · · &phgr; &bull; · Il
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This prevents the protective film from splitting away from the force application area or the entire protective film from being peeled off.

It is advantageous to lock the locking element in the frame. With the help of pins, bolts or claws that can be moved via locks, the locking element can be locked multiple times in corresponding recesses in the frame. The locking element can be adapted to the height of the frame, so that there are no parts that protrude beyond the frame.

There are particular advantages when the surface element is a window pane, as experience shows that these are particularly often soiled and damaged. Efficient protection is possible with highly transparent films without adversely affecting the transparency of the pane.

Further developments and advantages of the invention emerge from the subclaims and from the description with reference to the drawing. The figures show in detail:

Fig. 1 a multilayer protective film according to the invention in

schematic sectional view Fig. 2 a vehicle window provided with a protective film Fig. 3 a film cut with force introduction area

and closure element in perspective view.

Figure 1 shows a multilayer protective film 100 according to the invention. The protective film consists essentially of a base film 1 and a wear layer 2, which in turn is composed of a plurality of peel-off films 2 _i l, _iii , 2 _i n. An adhesive layer 3.1,...,3,&eegr; is arranged in the interface between two films 1,2.1,...,2.&eegr;. In a force introduction area 10, which is arranged on the right edge of the protective film 100 in Figure 1, the adhesive layer 3.1,...,3,&eegr; is arranged.

10 ,

layer is left out. It is also possible to interrupt this by inserting strips that reduce adhesion. In the force introduction area, the individual !peel-off films 2.1 ,...,2. &eegr; lie next to each other without being connected. It is therefore easy to split the film in the force introduction area 10, to grasp the edge of an upper peel-off film 2.&eegr; as a pull-off tab and to start peeling off the adhesive connection 3.&eegr;.

As shown in Figure 1, when the top adhesive bond is peeled off, the adhesive in the peeling area 18 is extremely overstretched, so that the adhesive bond breaks. The adhesive is preferably adjusted so that the break does not occur cohesively, i.e. within the adhesive layer, but adhesively, whereby the adhesive layer 3.&eegr; with the peel-off film 2.&eegr; is completely removed and no adhesive residues remain on the exposed new surface.

In the embodiment shown in Figure 1, the protective film 100 has an additional mounting adhesive layer 4 on the underside. This is also applied over the entire surface in the force introduction area 10.

Figure 2 shows a vehicle window, for example of an S-Bahn carriage. The window pane 28 is enclosed with a frame 26 and inserted into the body paneling 24. The window pane 28 is coated flush with a film cut 100', e.g. by gluing. The film cut 100' is made from a multi-layer protective film 100 according to the invention.

The window pane 28 with its foil cut 100' is soiled with sprayed paint in the form of a graffiti 32 and damaged by a scratch 34.

To achieve a new, clean and undamaged surface of the window

In order to obtain a locking disc 28, the locking element 22 is removed after the lock 21 is operated. It is also possible to design a part of the frame 26 in such a way that it can be removed as a locking element 22' after loosening a special screw connection 23' and in particular exposes a linear force introduction area.

As shown in Fig. 3, after removing the closure element 22, the force introduction area 10 is exposed.

The topmost peel-off film 2.n can be separated from the rest of the film assembly 1,2, so that a peel-off tab 6 can be grasped and the peeling process can be initiated. After the topmost peel-off film 2.n has been completely removed together with the adhesive layer 3.n, the peel-off film 2.n-l forms a new surface of the window pane 28.

The closure element 22 is put back on and locked in the frame with the locking elements 23, so that unauthorized access to the force introduction area 10 is impossible and unauthorized removal of further release films 2.1, . .., 2 .n-1 is prevented.

It is also suggested that a 100' film cut, consisting of clear or colored films, be applied to the body paneling 24 in order to obtain a new surface even if it is soiled with paint. This means that damage and paint soiling on the bodies of public transport as well as on emergency vehicles used by security forces can be removed quickly and easily.

Claims (21)

Al HVG05_A2.doc Protection claims: 1. Multi-layer protective film (100), consisting of a base film (1) made of plastic and a wear layer (2) which comprises at least one adhesive release film (2.1,...,2.n) made of plastic, characterized in that - that an adhesive layer (3.1,...,3.n) is arranged between the base film (1) and the wear layer (2) and between all release films (2 .1,..., 2 .n) within the wear layer (2), - that the multilayer protective film (100) can be manually split in at least one edge-side force introduction area (10), - that at least one upper release film (2.n) of the wear layer (2) can be removed while simultaneously completely removing the adhesion-promoting adhesive layer (3.n). 2. Multilayer protective film (100) according to claim 1, characterized in that the peel strength of each adhesive layer (3 .1,..., 3 .n) is smaller than the maximum tensile strength (normal stress) of the adhesive layers and smaller than the limit of the elastic deformability of the films (1, 2 .1,..., 2 .n) adhering to one another. 3. Multilayer protective film (100) according to claim 1 or 2, characterized in that the contacting films (1,2.1,..., 2.n) are free of adhesive layers in the force introduction area (10). A2 4. Multilayer protective film (100) according to claim 1 or 2, characterized in that in the force introduction area (10) an adhesion-reducing intermediate strip (12), in particular a silicone-coated paper or plastic film section, is inserted between each two contacting films (1, 2 .1,..., 2 .n). 5. Multilayer protective film (100) according to one of claims 1 to 4, characterized in that ^: the base film (1) is provided with an assembly adhesive layer (4) on the surface facing away from the wearing layer (2). 6. Multilayer protective film (100) according to claim 5, characterized in that the mounting adhesive layer (4) is formed from a pressure-sensitive adhesive. 7. Multilayer protective film (100) according to claim 5 or 6, characterized in that the mounting adhesive layer (4) is provided with a cover film. 8. Multilayer protective film (100) according to one of claims 1 to 7, characterized in that at least one peel-off film (2 .1,..., 2 .n) is provided on its surface facing away from the base film (1) with a scratch-resistant coating (4 .1,..., 4 .n) which increases the surface hardness. 9. Multilayer protective film (100) according to one of claims 1 to 8, characterized in that at least one peel-off film (2.1,..., 2.n) is provided on its surface facing away from the base film (1) with a dirt-repellent coating (5.1,..., 5.n) which reduces the surface tension, in particular based on silicone or PTFE. A3 10. Surface element (200) with wear-protected surface characterized by the following features: '' - the surface element (200) is coated with a film cut (100') of a multilayer protective film (100), which comprises a base film (1) and a wear layer (2), consisting of at least one adhesive peel-off film (2.l,&ldquor;.,2.n), - the foil blank (100') can be split manually in at least one edge-side force introduction area (10), - at least one upper release film (2.n) of the wear layer (2) can be removed from the film cut (100') by completely removing the adhesion-promoting adhesive layer (3.n). - the surface element (200) is provided with a closure element (22, 22') which prevents access to the force introduction area (10). 11. Surface element (200) according to claim 10, characterized in that the peel strength of each adhesive layer (3.1,..., 3.n) is less than the maximum tensile stress of the adhesive layer and less than the limit of the elastic deformability of the films adhering to one another (l,2.1,...,2.n), 12. Surface element (200) according to claim 10 or 11, characterized characterized in that the film blank (100') has a polygonal shape and a force introduction region (10) is formed on at least one corner. 13. Surface element (200) according to claim 10 or 11, characterized in that a force introduction region (10) running essentially parallel to the boundary line is formed on at least one outer boundary line of the film blank (100'). A4 ru 14. Surface element (200) according to one of claims 10 to 13, characterized in that the surface element (200) is a body panel (24), in particular made from a plastic panel or a metal sheet. 15. Surface element (200) according to one of claims 10 to 14, characterized in that the surface element (200) is a window pane (28). 16. Surface element (200) according to one of claims 10 to 15, characterized in that the surface element (200) is enclosed in a frame (26). 17. Surface element (200) according to one of claims 10 to 16, characterized in that the closure element (22, 22') can be locked in the frame (26). ■ j 18. Surface element (200) according to one of claims 10 to 17, characterized in that the contacting films (l,2.1,...,2.n) of the film blank (100') in the force introduction area (10) are free of adhesive layers. 19. Surface element (200) according to one of claims 10 to 18, characterized in that in the force introduction region (10) an adhesion-reducing intermediate strip (12), a silicone-coated paper or plastic film section, is inserted between each two contacting films (1,2.1,...,2.n) of the film cut (100'). 20. Surface element (200) according to one of claims 10 to 19, characterized in that at least one peel-off film (2.1,..., 2.n) of the film blank (100') is provided with a coating that increases the surface hardness on the surface facing away from the surface element (200). A5 21. Wear-resistant surface element (200) according to one of claims 10 to 19, characterized in that at least one peel-off film (2.1,..., 2.n) of the film blank (100') is provided on the surface facing away from the surface element (200) with a coating that reduces the surface tension, in particular based on silicone or PTFE.