EP1068073A1

EP1068073A1 - Multilayer protective film and flat element with wear-resistant surface

Info

Publication number: EP1068073A1
Application number: EP99938393A
Authority: EP
Inventors: Ulrich Haverkamp
Original assignee: Haverkamp SST Sciherheitstechnik GmbH
Current assignee: Haverkamp SST Sciherheitstechnik GmbH
Priority date: 1998-08-17
Filing date: 1999-07-31
Publication date: 2001-01-17
Also published as: WO2000009323A1; DE29814711U1

Abstract

The invention relates to a multilayer protective film (100) consisting of a base film (1) made of a plastic material and a wear-resistant layer (2) which comprises at least one adhesive peel-off film (2.1, ..., 2.n) made of a plastic material, an adhesive layer (3.1, ..., 3.n) being arranged between the base film and the wear-resistant layer. In at least one force-application area (10) situated along an edge the multilayer protective film can be manually separated and at least one upper peel-off film (2.n) of the wear-resistant layer can be peeled off such that the adhesive layer conferring the adhesive properties is fully removed at the same time.

Description

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

The invention relates to a multilayer protective film which consists of a base film made of plastic and a wear layer, the wear layer comprising at least one adherent peel-off film made of plastic.

Protective films made of plastic are used in many technical areas to protect sensitive surfaces. Some of them are only used for transport protection, but some also protect surfaces while a product is in use.

It is advantageous that damage, for. B. by scratching objects, or contamination affects only the plastic film and leaves the underlying surface intact. If a suitable adhesion promoter is selected, the surface can be freed from the damaged or soiled film and covered with a new film. Since films with excellent transparency are available, transparent glasses can also be coated with protective films.

However, the disadvantages are the high amount of work involved in removing stuck old film coatings and the high demands on manual skills in the application of foils to produce a wrinkle and bubble-free foil coating.

At the same time, plastic films, e.g. B. compared to glass, a low surface hardness, which leads to increased wear of 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-application.

It is also known, for example in the case of visors of motorcycle helmets, to cover a pane with a large number of film wear layers, the adhesion of the films to one another and to the pane itself being brought about by electrostatic charging. It is therefore possible to pull off the top, damaged or soiled film and to obtain a new, clear and clean surface with the next film underneath.

The disadvantage of this solution is that only very thin foils can be applied. With large-scale film cuts and with biaxially curved surfaces of the object to be covered, the adhesion due to electrostatic charging is not sufficient to achieve a full-surface wrinkle-free and bubble-free and also permanent bond. In addition, it has been found that when a film layer lying on top is peeled off from a known protective film, the adhesion of the film layer immediately below it is impaired, so that several wear layers can be removed unintentionally

It is therefore the object of the invention, in the case of a multilayer protective film according to the preamble of claim 1, which to avoid the disadvantages mentioned and to improve both the adhesion and the peelability of the films.

The object is achieved in that an adhesive layer is arranged between the base film and the wear layer and between all the peel-off films within the wear layer, that the multilayer protective film is manually cleavable in at least one edge-introducing force area, that at least one pull-off film on top is underneath the wear layer simultaneous complete removal of the adhesion-promoting adhesive layer is peelable.

For a better understanding, the surface of the protective film that can be applied to the object to be protected is referred to below and the surface of the film that points freely into the space is referred to above.

In contrast to the electrostatic adhesion known from the prior art, in the case of a multilayer protective film of the invention, adhesive bonds are formed by the inserted adhesive layer. The adhesive strength of the release liners is so great that is prevented during use of counter ^¬ articles which are coated with the protective film, an inadvertent detachment of individual release liners.

The surfaces of the peel-off films are advantageously made such that at least one peel-off film of the wear layer on top can be peeled off with simultaneous complete removal of the adhesive layer. The adhesive layer is therefore removed with the worn peel-off film when peeling and the exposed peel-off film has a clean surface. The initiation of the peeling process is facilitated by the fact that the multilayer protective film can be split manually in at least one area of the force application on the edge.

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, that is to say less than the maximum normal stress in the adhesive joint. When peeling off, the entire force acts concentrated along a line, namely the transition from the area of the foils already detached from one another to the area still glued to one another. The resulting high loads due to shear and tensile stresses in the adhesive layer, combined with extreme overstretching, lead to the adhesive layer breaking along the peeling line. The layers underneath, however, are not loaded to the limit. Since the limit of elastic deformability of the layers below is also not reached when the uppermost layer is peeled off, local stretching of the lower layers and associated changes such as bulging are also avoided.

The advantage here is that peeling an overlying, worn film exposes an underlying peel-off film, but that all further, underlying adhesive layers of the remaining protective film remain unaffected, since these are only loaded with normal stresses. The adhesive layer according to the invention can be subjected to normal stresses which are greater than the peel strength.

Also, all the foils lying under the worn foil remain unaffected, since the peel strength of the adhesive layers is in each case less than the limit of the elastic deformability of the foils, ie the adhesive layer dissolves before greater forces act on the remaining plastic foil. which could cause plastic deformation of the film materials.

An embodiment of the invention provides for the contacting foils to be made free of adhesive layers in the force application area. The individual foils lying loosely on top of one another in the area can easily be gripped with the fingers and the pulling off can be initiated. Tools such as knives are advantageously not required for splitting.

Another form of protective film according to the invention provides that an adhesion-reducing intermediate strip, in particular a strip-like silicon-coated paper or plastic film section, is inserted in each case between two contacting films in the force application area. This also makes it easier to initiate the manual peeling process. Also arise

Advantages in the production of a protective film, since each peel-off film can first be coated with adhesive over the entire surface, a protective strip then being inserted in the film production direction when the individual films are brought together.

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

Advantageously, there is at least one peel-off film on the

Surface facing away from the base film is provided with a dirt-repellent coating which reduces the surface tension, in particular based on silicone or PTFE. Liquids that hit the protective film, for example paints, roll off and the adhesion of dust particles is reduced. The protective film can be applied to an object using liquid adhesives as assembly adhesives, for example a water-soluble acrylate adhesive, as is known per se.

However, it is advantageous to provide the protective film with an assembly adhesive layer already during manufacture. The adhesive layer can consist of microencapsulated, pressure-sensitive adhesives or of those adhesives which first have to be activated with moisture and / or heat.

If a mounting adhesive layer that is permanently sticky even at room temperature is provided, and in order to effectively prevent contamination before installation, in particular in the case of transparent protective films, the mounting adhesive layer is advantageously provided with a cover film.

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

The problem of deliberate soiling and damage arises particularly with area elements that are installed in a publicly accessible location. The removal of sprayed paint from a surface element is extremely difficult and can only be carried out with expensive manual work. With sharp or pointed objects, the surface element can be damaged and possibly become unusable, so that an exchange is necessary.

It is therefore a further object of the invention to provide a surface element which is protected from wear and tear from permanent use and willful damage or soiling. This task is solved by the following features:

the flat 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 adhering release film,

the film cut can be split manually in at least one edge-side force application area,

at least one pull-off film on top of the wear layer can be removed from the film blank with complete removal of the adhesive layer,

- The flat element (200) is provided with a locking element (22, 22 ') which prevents access to the force introduction area (10).

It is advantageous that the flat element according to the invention is protected 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 flat element and glued. The base film can have one or more layers and can integrate additional functions such as splinter protection, increasing the breaking strength or reducing the solar radiation. By designing 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 to obtain a new surface. The films adhere only weakly to one another in a force application area or lie unconnected next to one another, so that manual splitting of the film composite and thus the removal of a worn release film is easily possible.

It is an essential advantage of the invention that the accidental or deliberate removal of the peel-off films from the flat element is prevented by the fact that the flat element ment is provided with a locking element preventing access to the force introduction area. Only after the closure element has been removed is the force introduction area exposed and the removal of individual peel-off films is made possible.

The film blank preferably has a polygonal shape and a force introduction area is formed on at least one corner. In the case of a rectangular cut, for example, there is a force introduction area in the form of a triangular pull tab that can be gripped with the fingers.

A simple production of a sheet-like protective film is made possible by the fact that a force introduction area running essentially parallel to the boundary line is formed on at least one outer boundary line of the film blank. It is also advantageous here that the top peeling film can be peeled off evenly over the entire width of the film blank.

The flat element is advantageously a glass pane in which damage and soiling have a particularly disruptive effect, since the transparency is reduced and scattered light is also produced at the damaged areas.

The surface element can also be a body paneling, which is made in particular from a plastic sheet or a metal sheet. This means that the bodies of rail wagons, buses or police and fire brigade vehicles can be equipped to be wear-resistant. The base film can already contain the paint.

It is also proposed that the surface element is enclosed in a frame. The edge area of the protective film can thus be covered all the way so that a wanton Splitting of the protective film away from the force application area or peeling off of the entire protective film is prevented.

The locking of the locking element in the frame is favorable. With the help of pins, bolts or claws, which can be moved via locks, the locking element can be locked several times in corresponding recesses in the frame. The closure element can be adapted to the frame height, so that there are no parts projecting over the frame.

There are particular advantages if the flat element is a window pane, since experience has shown that this is particularly frequently soiled and damaged. Efficient protection is possible with well-transparent films without adversely affecting the transparency of the pane.

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

1 shows a multilayered protective film according to the invention in a schematic sectional view. FIG. 2 shows a vehicle window provided with a protective film. FIG. 3 shows a film cut with a force introduction area and closure element in a perspective view

FIG. 1 shows a multilayer protective film 100 according to the invention. The protective film essentially consists of a base film 1 and a wear layer 2, which in turn is composed of a large number of release films 2.1, ..., 2.n. An adhesive layer 3.1, ..., 3.n is arranged in each case in the interface between two foils 1, 2, 1, ..., 2n. In a force application area 10, which is arranged on the right edge of the protective film 100 in FIG. recessed layer. However, it is also possible to interrupt them by inserting strips that reduce adhesion. In the area of force application, the individual peel-off films 2.1, ..., 2.n are present side by side without being connected. It is therefore simply possible to split the film in the force application area 10, to grip the edge of an upper release film 2.n as a pull tab 6 and to initiate the stripping of the adhesive connection 3.n.

As shown in FIG. 1, the adhesive in the formwork area 8 is extremely overstretched when the uppermost adhesive connection is removed, so that the adhesive connection breaks. The adhesive is preferably adjusted so that the break is not cohesive, i.e. within the adhesive layer, but in an adhesive manner, as a result of which the adhesive layer 3.n with the peelable film 2.n is completely removed and no adhesive residues remain on the uncovered new surface.

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

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

The window pane 28 with its film blank 100 'is soiled with sprayed-on lacquer in the form of a graffiti 32 and is damaged by an incision 34. In order to obtain a new, clean and undamaged surface of the window pane 28, the closure element 22 is removed after the lock 21 has been actuated. It is also possible to design part of the frame 26 such that it can be removed as a closing element 22 'after loosening a special screw connection 23' and in particular exposes a linear force application area.

As FIG. 3 shows, after the closure element 22 has been removed, the force introduction region 10 is exposed. The top peel-off film 2.n can be split off from the rest of the film composite 1, 2, so that a pull-off tab 6 can be gripped and the peeling process can be initiated. After complete removal of the topmost peel-off film 2.n together with the adhesive layer 3.n, the peel-off film 2.n-1 forms a new surface of the window pane 28.

The closure element 22 is put back on and locked with the locking elements 23 in the frame, 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 to apply a film blank 100 ', consisting of clear or colored films, to the body planking 24 in order to obtain a new surface here also in the event of contamination with paints. Damage and dirt from paintwork on the bodies of public transport as well as emergency vehicles can be quickly and easily removed by security personnel.

Claims

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 peel-off film (2.1, ..., 2.n) made of plastic, characterized in that between the Base film (1) and the wear layer (2) and between all peel-off films (2.1, ..., 2. n) an adhesive layer (3.1, ..., 3. n) is arranged within the wear layer (2) that in at least In a force introduction area (10) on the edge, the multilayer protective film (100) can be split manually, so that at least one peel-off film (2.n) on top of the wear layer (2) can be peeled off with simultaneous complete removal of the adhesion-promoting adhesive layer (3.n).

2. Multi-layer protective film (100) according to claim 1, characterized in that the peel strength of each adhesive layer (3.1, ..., 3.n) is less than the maximum tensile strength

(Normal stress) of the adhesive layers and less than the limit of the elastic deformability of the films adhering to one another (1, 2.1, ..., 2.n).

3. Multi-layer protective film (100) according to claim 1 or 2, characterized in that the contacting films (1, 2.1, ..., 2.n) in the force introduction area (10) are free of adhesive layers.

4. Multi-layer protective film (100) according to claim 1 or 2, characterized in that in the force application area (10) between two contacting films (1, 2.1, ..., 2. n) an adhesion-reducing intermediate strip (12), in particular a silicon-coated paper or plastic film section is inserted.

5. Multi-layer protective film (100) according to one of claims 1 to 4, characterized in that the base film (1) on the wear layer (2) facing away from the surface is provided with a mounting adhesive layer (4).

6. Multi-layer protective film (100) according to claim 5, characterized in that the mounting adhesive layer (4) is formed from a pressure-sensitive adhesive.

7. Multi-layer protective film (100) according to claim 5 or 6, characterized in that the mounting adhesive layer (4) is provided with a cover film.

8. Multi-layer protective film (100) according to one of claims 1 to 7, characterized in that at least one peel film (2.1, ..., 2.n) on its surface facing away from the base film (1) with a surface hardness increasing, scratch-resistant coating (4.1, ...,. n) is provided.

9. Multi-layer protective film (100) according to one of claims 1 to 8, characterized in that at least one peeling film (2.1, ..., 2. n) on its surface facing away from the base film (1) with a surface tension reducing, dirt-repellent coating (5.1, ..., 5. n), in particular based on silicone or PTFE.

10. surface element (200) with a wear-protected surface characterized by the following features:

- The surface element (200) is coated with a film cut (100 *) of a multi-layer protective film (100), which comprises a base film (1) and a wear layer (2), consisting of at least one adherent peel-off film (2.1, ..., 2. n) includes

- The film blank (100 ') can be split manually in at least one area of force introduction (10) on the edge,

- At least one pull-off film (2.n) on top of the wear layer (2) can be removed from the film blank (100 ') with complete removal of the adhesion-promoting adhesive layer (3.n). - The surface element (200) is provided with a locking 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 mutually adhesive films (1 , 2.1, ..., 2. N),

12. Surface element (200) according to claim 10 or 11, characterized in that the film blank (100 ') has a polygonal shape and a force introduction area (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) extending essentially parallel to the boundary line is formed on at least one outer boundary line of the film blank (100 ').

14. surface element (200) according to one of claims 10 to 13, characterized in that the surface element (200) is a body paneling (24), in particular made of a plastic sheet or a metal sheet.

15. surface element (200) according to any one of claims 10 to 14, characterized in that the surface element (200) is a window pane (28).

16. surface element (200) according to any 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 any one of claims 10 to 16, characterized in that the closure element (22, 22 ') in the frame (26) can be locked.

18. surface element (200) according to any one of claims 10 to 17, characterized in that the contacting foils (1, 2.1, ..., 2.n) of the foil blank (100 ') in the force application area (10) are free of adhesive layers .

19. surface element (200) according to any one of claims 10 to 18, characterized in that in the force application area (10) in each case between two contacting foils

(1,2.1 ... 2 .n) of the film cut (100 '), an adhesion-reducing intermediate strip (12), a silicon-coated paper or plastic film section, is inserted.

20. surface element (200) according to any one of claims 10 to 19, characterized in that at least one peeling film (2.1, ..., 2.n) of the film blank (100 ') on the surface facing away from the surface element (200) with a Surface hardness increasing coating is provided.