WO2007079919A1

WO2007079919A1 - Cover comprising multiple surface structure patterns for covering adhesive products, and methods for the production thereof

Info

Publication number: WO2007079919A1
Application number: PCT/EP2006/012187
Authority: WO
Inventors: Hansjörg Ander; Rolf Becher; Thomas Fogel; Margret Haag; Ulrich Neitzert; Heinz Josef RÖSER; Michael SCHÜRMANN; Cornelia Sundrum
Original assignee: Lohmann Gmbh & Co. Kg
Priority date: 2005-12-23
Filing date: 2006-12-18
Publication date: 2007-07-19
Also published as: DE102005061768A1; DE102005061768B4

Abstract

The invention relates to a cover for adhesive layers of adhesive products, comprising at least one surface which can be joined to the adhesive layer in a detachable manner. Said surface comprises at least one three-dimensional pattern which has a plurality of raised structures such that a correspondingly complementary pattern is formed in an adhesive layer which is joined to the cover by embossing the raised structures in the surface of the adhesive layer. Said surface is provided with a first pattern which comprises a plurality of raised structures (11, 12) which are formed irregularly and are irregularly distributed in the surface. Also, the surface is provided with at least one additional three-dimensional pattern which overlaps the first pattern and which comprises a plurality of raised structures (21, 22) which are regular or irregular, and which are distributed in a regular or irregular manner in the surface.

Description

Cover with multiple surface texture patterns for covering adhesive products, as well as methods of making the same.

The invention relates to a cover for covering adhesive products, such as adhesive tapes or adhesive films, which has multiple, superimposed patterns of surface structures. The invention further relates to the use of such covers for covering adhesive products such as adhesive tapes or adhesive films, as well as adhesive products which are covered with the covers according to the invention, and to processes for the production of the coverings and adhesive products according to the invention.

Adhesive products, such as adhesive tapes or adhesive films, which are generally composed of a carrier layer and an adhesive layer coated thereon, are used in a variety of applications for joining or joining objects, or as a protective or decorative material for covering surfaces of objects. The surface of the adhesive layer intended to produce the adhesive bond is generally covered with a cover, also called a release liner, which is removable and is removed from the adhesive layer before the adhesive product is used.

The sticking of adhesive tapes or adhesive films to a surface to be bonded or covered is often difficult, since even with very skillful handling it can not be avoided that air bubbles form between the surface to be bonded and the adhesive layer. A subsequent elimination of these trapped air is usually not possible or at least associated with additional work. The presence of air bubbles has an unfavorable effect on the strength of the adhesive bond, for Others, the resulting unevenness of the outwardly visible surface of the adhesive film or the adhesive tape is disadvantageous.

In order to suppress the formation of air bubbles, it is known that the adhesive layer surface is not completely smooth, but has recesses which facilitate the escape of air during the bonding process. This can be achieved, in particular, by covering the surface of the adhesive layer with a cover which, on the side facing the adhesive layer, has corresponding three-dimensional relief-like raised surface structures which can form a regular or irregular nostril. When the cover is placed on an adhesive layer and pressed on, the surface structures are embossed in the adhesive layer, so that there corresponding complementary (or negative) surface structures are formed, which form a corresponding complementary Nüster. Release liner with suitable textured surfaces are commercially available, for example, covers having an irregular surface texture known as "orange peel structure."

The disadvantage here is that the embossing produced by such a cover in the adhesive layer has only relatively short and self-contained channel structures, which can not completely satisfactorily suppress the formation of air bubbles. A derivative of the air to the lateral edges of the cover or the adhesive layer is considerably more difficult in such structured covers.

The present invention was therefore based on the object to provide covers for adhesive layers, which can be produced in a simple and cost-effective manner, and which are suitable in the surfaces of adhesive layers Create structures that allow an improved discharge of air during the bonding process.

These and other objects are surprisingly achieved by the subject matters defined in the independent claims, and by the preferred embodiments described in the dependent claims.

According to the main claim, the present invention relates to a cover for adhesive layers of adhesive products. The cover has at least one surface, which is connectable to an adhesive layer and is then removable from this again. The said surface of the cover has at least a three-dimensional pattern comprising a plurality of raised structures. When an adhesive layer is covered with this cover, the three-dimensional pattern causes a corresponding complementary pattern of recesses to be formed in the adhesive layer detachably connected to the cover by embossing the raised structures into the surface of the adhesive layer.

The said surface of the cover has at least a first pattern comprising a plurality of raised structures irregularly shaped and randomly distributed in the surface. In this way, by embossing the raised structures in a surface of an adhesive layer, a complementary pattern is formed in the surface of this adhesive layer. The embossed in the surface of the adhesive layer first pattern comprises a plurality of each self-contained channels (based on the plan view and the top view). The named first pattern is preferably an irregularly formed pattern with irregularly arranged structures, in particular in the form of an orange peel structure. Such an orange peel structure may be on the The person skilled in the known manner be produced by embossing or other methods for surface treatment. The said irregular nostril may, for example, also be formed by a multiplicity of irregularly arranged nests which are spaced apart from one another.

Furthermore, said surface of the cover of the present invention comprises at least one further three-dimensional pattern superimposed on said first pattern and comprising a plurality of raised structures. These raised structures are regularly or irregularly shaped and are distributed in a regular or random arrangement in the surface. By embossing the raised structures of said further pattern in a surface of an adhesive layer, a further complementary pattern is formed, which comprises a plurality of each self-contained connection channels. The connection channels connect the closed channels created by the first pattern in such a way that an open, coherent channel system is formed in the surface of the adhesive layer. This open channel system allows the discharge of air to the outside, d. H. towards the edges of the adhesive layer.

The further three-dimensional pattern (s) is / are preferably produced by means of embossing methods (eg by means of embossing plate or embossing roller). However, said at least one further three-dimensional pattern can also be a surface structure produced by a printing process.

By virtue of the overlaying of the first pattern provided according to the invention, which for the most part is able to form only channels closed in itself, with at least one further pattern which is suitable for generating the described connection channels, the formation of a first pattern Sammenhängenden channel system allows in a covered with the cover according to the invention adhesive layer. This continuous, outwardly open channel system ensures a very efficient discharge of air during the bonding process, so that the formation of air bubbles or trapped air is reliably suppressed.

The invention is not limited to the prevention of air inclusions; it also extends to the inclusion of other gaseous and / or liquid substances or mixtures of substances and allows the discharge of liquid and / or gaseous substances or mixtures into the environment, as described above for the example of trapped air.

Due to the presence of said three-dimensional patterns (surface structures), the relevant surface of the cover is characterized by a certain macroscopic surface roughness. It is preferred that the said raised structures are substantially homogeneously distributed over the surface of the cover, i. H. the surface density of the structures over the entire surface of the cover (or in the area of a repetition unit, see below) is essentially constant.

A further advantage of the covers according to the invention is that different channel structures can be obtained by different combinations of a first pattern with one or more further patterns, namely by the described superposing of the individual patterns, so that an optimal adaptation of the channel structures and thereby conditional air flow conditions to the respective conditions (eg flow properties of the adhesives used, total width of an adhesive tape or an adhesive film) is made possible. Starting from a small number of patterns (eg first pattern, second pattern) By multiple overlaying of a second pattern over an existing first pattern, different channel structures can be generated. The "multiple overlay" can be done in such a way that a second pattern is impressed once, or two or more times in a staggered arrangement, in the cover.

The covers according to the invention can be produced simply and inexpensively, since covers which have an embossing pattern corresponding to the first pattern described above are available on the market or can be produced from known starting materials by means of known embossing methods.

The covers according to the invention have at least one surface which can be connected to an adhesive layer and is subsequently removable from it. Materials suitable for this purpose are known to the person skilled in the art and are available on the market; Covers of the following materials are particularly suitable: polyolefins (polyethylene, polypropylene), polyvinyl chloride, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, polycarbonate, polyethylene terephthalate, fluorinated thermoplastics, polyurethanes, polyamides, polyimides, paper, polyethylene layered paper, silicone-coated polymer materials, as well as laminates and co-extrudates of the aforementioned materials. The application of adhesion-reduced (dehesive) coatings can take place before or after the embossing of the cover. The surface of the cover provided with said raised structures has in this case a corresponding adhesive coating.

Adhesives and adhesive layers contemplated for the purposes of the present invention are also known to those skilled in the art and are available on the market. Preference is given to using pressure-sensitive adhesives and pressure-sensitive adhesive layers. solvent-based pressure-sensitive adhesives, water-based adhesive systems (in particular dispersions), solvent-free pressure-sensitive adhesives or hot-melt pressure-sensitive adhesives of various compositions, for example pressure-sensitive adhesives based on polyacrylate, silicone pressure-sensitive adhesive, pressure-sensitive adhesives based on synthetic rubber, pressure-sensitive adhesives based on natural rubber, Pressure-sensitive adhesives based on cellulose derivatives, and combinations thereof.

According to a preferred embodiment of the invention, the said further pattern (s), or the first pattern together with the further pattern (s) superimposed thereon respectively form a repeating unit, two or more of these repeating units being adjacent to one another - derlieliegend and / or arranged in series. The production of such repeating units can be effected, for example, by means of an embossing roll or embossing plate, the length or width of the repeating units being determined by the circumference and the width of the embossing roll or by the length and width of the embossing plate used in each case.

Within each repeat unit, as described above, said first pattern is irregular and arranged in a random arrangement. The repeating units arranged side by side and / or in succession each contain substantially the same pattern.

The repeating units arranged side by side and / or in succession each have substantially the same geometric shape and surface area, preferably rectangular or square. The surface area of the repeating units is preferably in the range of 10 cm ² to 1 m ² , in particular 25 cm ² to 250 cm ² (in each case based on a repeat unit). According to a further preferred embodiment of the invention, the surface of the cover is provided with a further three-dimensional pattern superimposed on said first pattern and said further pattern. This further three-dimensional pattern comprises one, preferably at least two or more elongate raised structures, preferably in the form of ridges or beads. By embossing these elongated raised structures into the adhesive layer, another complementary pattern is formed in the surface thereof, comprising one or more main channels, the main channels communicating with said channel system. The main channels are the depressions formed by the elongate raised structures. The main channels ensure a particularly efficient discharge of the air (or other gaseous or even liquid substances) during the gluing process.

The said elongated raised structures preferably extend in a straight line, for example in a parallel arrangement. In this case, an arrangement in the longitudinal direction (based on the adhesive tape or on the stripping direction of the cover) is preferred. According to a further advantageous embodiment, the lines are wavy or in the form of curved lines, whereby a particularly effective discharge of the air can be achieved. The undulating or curved lines can be formed regularly or irregularly, for example with - with respect to a longitudinal direction - constant, increasing or decreasing amplitude. Combinations of the aforementioned Strukturelernente are possible.

Furthermore, it is alternatively provided that the said elongated raised structures run in a straight line and in a lattice-like arrangement, preferably in a right-angled or diamond-shaped arrangement. If an object to be glued or glued with an adhesive product (eg adhesive tape) has a surface with a three-dimensional (relief-like) structure, it is advantageous if the said structures of the three-dimensional patterns, or at least a part of these structures, in such a way that the structure produced in the adhesive layer is wholly or partially complementary to the three-dimensional (relief-like) structure of the object to be bonded. The surface structure of the adhesive layer is changed by the structured surface of the cover such that it is complementary or at least partially complementary to the surface topography of the surface to be bonded. In this way, the strength of the adhesive bond is increased and the external appearance of the adhesive bond is improved.

According to a particularly preferred embodiment, the surface of the cover has two or more repeating units arranged side by side or in succession, each having at least two superimposed three-dimensional patterns (as described above), wherein elongate raised structures, as mentioned above, are provided between the adjoining repeating units are. This can be achieved, for example, by using a stamping plate having a corresponding raised peripheral edge. Another possibility is the use of an embossing roll, which has on its lateral surface an axis-parallel, raised edge or strip, and on both sides of a circumferential raised edge.

As mentioned, the surface of the cover according to the invention has a multiplicity of raised structures. The resulting structures are in the plan view as a regular or irregular pattern, or as an elongated structure. doors, to recognize. The structures are referred to as "sublime", because they - with respect to the not deformed by embossing surface areas of the cover - protrude from the base of the cover.

The height of the raised structures is preferably in the range of 5 to 500 μm, in particular in the range of 10 to 100 μm, in each case measured from the plane of that surface area which directly surrounds the raised structure.

With regard to the areal extent of the raised structures, it is preferred that the raised structures of the first pattern and / or of said at least one further pattern have a length in the range from 0.05 to 10 mm, preferably from 0.1 to 1 mm. The length refers to the maximum longitudinal extent of the relevant base of a raised structure. The said elongate raised structures preferably have a length in the range of 0.5 cm to 2 m, in particular in the range of 10 cm to 50 cm.

Preferably, the elongate raised structures, or at least some of these structures, extend to an outer edge of the cover, for example over the entire width of a cover. The lateral distance between adjacent (eg, parallel) elongate raised structures is preferably 0.5-100 cm, more preferably 10-200 mm. The elongate raised structures preferably have a width in the range of from 10 μm to 1 mm, more preferably from 50 to 100 μm (measured at the widest point, respectively).

The area ratio of the raised structures of said patterns is preferably in the range of 0.1 to 50%, preferably in the range of 1 to 10%. The area density (= number of structures per unit area) of the raised Structures of the first pattern and / or the second pattern is preferably in the range of 1 to 100 cm ^-2, particularly preferably in the range of 5 to 25 cm ^"2.

The invention further extends to adhesive products having an adhesive layer covered with a cover of the type described above, as well as to adhesive products covered with such a cover and in the surface of which the corresponding complementary complementary surface (s) are coated. Pattern is imprinted / are. This means that the embossed pattern remains at least temporarily even after the cover has been detached from the adhesive layer. After the cover has been removed, the surface of the adhesive layer has a coherent channel system, which is produced by the impressing of the said pattern (s) and which produces an extremely effective discharge of air (or of another gaseous or liquid substance or substance mixture). guaranteed to the edges of the adhesive layer, so that the formation of air bubbles or trapped air is avoided.

The adhesive products according to the invention are, in particular, adhesive tapes or adhesive films, which may each be single-sided or double-sided adhesive. The adhesive products may additionally have a carrier layer, on which the adhesive layer is applied and to which it is firmly connected. The carrier layer can be made, for example, from materials such as paper, fleece, films, fabrics or foams; Suitable materials for this purpose are known to the person skilled in the art. Furthermore, the covers according to the invention are also suitable for use in carrier-free adhesive products (transfer adhesive tapes, transfer adhesive films).

The composition of the adhesive layer of the invention adhesive products are preferably selected so that the flow properties of the adhesive layer are such that the complementary patterns (ie depressions) impressed by the cover are retained even after the cover has been detached from the adhesive layer, preferably at least for a period of 5 minutes the peeling, more preferably at least for a period of 30 minutes after peeling, each at an ambient temperature of 15 to 25 ⁰ C.

The invention also extends to methods of manufacturing covers of the type described above. These methods include

(1) providing a web of material having a surface with a first pattern comprising a plurality of raised structures irregularly shaped and randomly distributed in the surface. If necessary, a non-embossed web may be provided with said pattern by a known embossing method (as described above); such as

(2) generating at least one further three-dimensional pattern in said surface, the further pattern being superposed on said first pattern. The further pattern comprises a plurality of raised structures which are regularly or irregularly shaped and which are distributed in a regular or random arrangement in the surface. The further pattern is superimposed on the first pattern in such a way that the raised structures of the further pattern are connected to the raised structures of the first pattern.

Said further three-dimensional pattern can optionally also be applied two or more times over the first pattern, each with a lateral offset and / or one Offset in the longitudinal direction. This can be achieved for example by different application of the embossing roller or the embossing plate, or by successively arranged embossing rollers.

Preferably, said raised structures, or at least a part of these structures, are produced by embossing processes, in particular using an embossing roll (rotary embossing) or an embossing plate (plan embossing). Particularly advantageous here is the use of embossing tools which are suitable for forming the said patterns in the form of repeat units, as described above. The embossing of the cover preferably takes place from the side opposite to the side intended for contact with the adhesive layer. Alternatively, the aforementioned three-dimensional patterns may be formed by embossing the cover from both sides (adhesive layer contact side and opposite side). Furthermore, it is possible to produce at least two or all of the three-dimensional patterns mentioned by a single embossing process (through the surface of the liner).

Furthermore, the raised structures can also be produced by other known methods, for example by printing or roller coating or by etching. Said raised structures of the other three-dimensional pattern (s), or at least some of these structures, can be produced by means of printing processes.

According to a preferred embodiment, a material web is used in the production of the cover as the starting material, which - as mentioned above - is provided with an "orange peel structure" (or another irregularly structured surface). At least one further three-dimensional surface will be on this structured surface Pattern printed with raised structures. The imprinting of the further three-dimensional pattern causes the raised structures of the further pattern to be in connection with the raised structures of the first pattern (the "orange-skin structure"). In this way connecting channels are created in an adhesive layer covered with the cover thus produced, which connect the closed channels created by the "orange peel structure" in such a way that an open coherent channel system is formed in the surface of the adhesive layer described above.

According to a particularly preferred embodiment of the method, the cover is additionally provided with a further three-dimensional pattern which is superposed on said first pattern and said further pattern and which comprises one or more elongate raised structures, preferably in the form of ridges or beads. The further pattern is superposed with the aforementioned patterns in such a way that the elongate raised structures are connected to the raised structures of the first pattern and / or to the raised structures of the pattern.

The manufacturing method according to the invention may comprise a further step in which the side of the cover intended for contact with an adhesive layer is treated by means of siliconization or fluorosiliconization. This step can be done either before or after the embossing process.

The present invention further extends to the use of the covers described above for the production of single- or double-sided adhesive products, preferably of adhesive tapes or adhesive films, as well as a method for reducing the risk of the formation of Air pockets (or inclusions of other gaseous or even liquid substances or mixtures of substances) when bonding an adhesive product to a substrate. The method comprises the following steps: providing a cover according to the invention as described above;

- placing the cover on an adhesive surface of the adhesive product in such a way that the raised structures of the cover are pressed into the adhesive surface;

Removing the cover from the adhesive surface of the adhesive product, wherein complementary structures in the form of an open channel structure are formed by the raised structures in the adhesive layer, and wherein the complementary structures embossed into the adhesive layer, even after the cover has been detached from the adhesive layer, at least temporarily remain;

- contacting the adhesive surface of the adhesive article with a surface of the substrate resulting in an adhesive bond.

Alternatively, the procedure may be such that a cover provided with a three-dimensional pattern as described above is placed on an adhesive layer surface previously provided with a surface structure which is at least partially complementary to the three-dimensional pattern present in the cover is complementary. Conversely, it is possible to produce an adhesive to a product having a predetermined surface structure, a cover with a complementary (or at least partially complementary) surface structure, and this fitting on the surface structure of the adhesive layer and connect to this. In both cases, the cover is placed on the adhesive surface of the adhesive product in such a way that the raised structures of the cover, or at least a part of these structures, come to lie in the existing in the adhesive surface complementary structures.

As described above, adhesive products (e.g., single-sided or double-sided adhesive tapes or labels) can be made such that a cover according to the present invention having a three-dimensional pattern having a plurality of raised structures is applied to the adhesive surface of a prior art applied adhesive product or / and pressed on.

Alternatively, the preparation may also be carried out in such a way that a liquid adhesive substance (eg adhesive solution, dispersion, melt) is applied to the surface of the cover provided with the three-dimensional nostril (eg by knife coating). During solidification of the adhesive mass (by drying or cooling), the described open channel system is formed in the adhesive layer. The cover used in the manufacture can either remain on the adhesive layer (until applied), or it can be peeled off and replaced with a conventional cover (with a smooth surface). In the latter case, the cover according to the invention is used only as a process foil during manufacture to produce said channel structure in the adhesive layer.

Furthermore, it is provided according to the invention that the production of an adhesive product takes place in such a way that initially an adhesive layer is produced or provided, which is covered on one of the two surfaces with a cover, which on the side facing the adhesive layer, the having said first pattern. Subsequently, the cover connected to the adhesive layer is provided with at least one further three-dimensional pattern (as described above). This further pattern is impressed by the free (facing away from the adhesive layer) surface of the cover forth in the cover, wherein the embossed Nüster is impressed by the deformation of the cover caused thereby simultaneously in the adhesive layer.

The invention will now be described by way of example with reference to schematic drawings.

Fig. 1 shows - in plan view - an area of a cover with a first pattern (10), which is formed from a plurality of individual raised structures (11, 12). The sublime structures have irregular shapes and their arrangement is random. The length L of a structure in the given case is on average 0.5 mm. Between the raised structures are island-like surface areas (15), which are not raised.

Fig. 2 shows - in plan view - a second pattern (20) formed from a plurality of individual raised structures (21, 22). The raised structures have regular shapes and they are regularly arranged. The length L of a structure (21, 22) is in the specified case about 0.7 mm.

Fig. 3 shows - in plan view - a surface region of a cover according to the invention, in which the pattern shown in Fig. 1 (10) with the pattern shown in Fig. 2 (20) is superimposed.

Fig. 4 shows - in plan view - a surface region of an adhesive layer (80) in which by pressing the cover shown in Fig. 3 on the adhesive layer surface and by subsequent detachment of this cover, a correspondingly complementary embossing pattern (40) was generated. This embossed pattern represents a branched system of channels or Trenches (41, 42).

FIG. 5 shows-in plan view-the surface area shown in FIG. 3, which additionally has an arrangement of elongate raised structures (31, 32) which are in communication with the aforementioned structures (11, 12, 21, 22) ,

Fig. 6 shows - in plan view - a surface area of a cover according to the invention with successive repeat units (50, 51, 52), each repeat unit having superimposed embossing patterns (not shown, eg as in Fig. 3 or Fig. 5). Between the repeating units and at their lateral edges there are elongate raised structures (33, 33 ', 33 ", 34, 34') for forming said main channels in the adhesive layer surface.The longitudinal direction is indicated by arrow (a), which is width denoted by (B).

Fig. 7 shows - in section - an inventive adhesive tape with a removable cover (60), a carrier (70), and an intermediate adhesive layer (80) which is permanently connected to the carrier. The surface (2) of the cover (60) has a multiplicity of embossed, raised structures (13, 14, 23) of the superimposed patterns (10, 20) which are present in the adhesive layer (80) after detachment of the Cover (60) leave corresponding complementary recesses.

The covers according to the invention are advantageously suitable for use in the production of adhesive and / or sealing products of the most varied types. The inventive superimposition of embossed structures allows optimal adaptation to different conditions of use.

Claims

claims

1. cover (60) for adhesive layers of adhesive products, which has at least one surface (2) which is connectable to an adhesive layer (80) and is removable from this again, wherein the surface (2) has at least a three-dimensional pattern comprising a plurality of raised structures and causing a corresponding complementary pattern to be formed in an adhesive layer detachably connected to the cover by embossing the raised structures in the surface of the adhesive layer, characterized in that

- said surface (2) comprises a first pattern (10) having a plurality of raised structures (11,

12) which are irregularly shaped and distributed in a random arrangement in the surface, wherein the embossing of the raised structures (11, 12) in the surface of an adhesive layer (80) a complementary pattern is formed, which a plurality of each comprises self-contained channels; and that

- said surface (2) of the cover comprises at least one further three-dimensional pattern (20) superimposed on said first pattern (10) and comprising a plurality of raised structures (21, 22) regularly or irregularly shaped, and which are distributed in the surface in a regular or random arrangement, wherein a further complementary pattern (40) is formed by embossing the raised structures (21, 22) of said further pattern (20) in a surface of the adhesive layer (80) comprising a plurality of mutually self-contained connection channels, the connection channels connecting the closed channels created by the first pattern (10) in such a way that an open, contiguous channel system (41, 42) is formed.

2. Cover according to claim 1, characterized in that the / the further (n) pattern (20), or the first pattern (10) with the / the above further pattern (s) (20), in each case a repeat unit (50 , 51, 52), wherein two or more of these repeating units are arranged side by side and / or in series.

3. A cover according to claim 1 or 2, characterized in that the surface (2) of the cover (60) has a further three-dimensional pattern which is superimposed on said first pattern (10) and said further pattern (20), and comprising one or more elongate raised structures (31, 32), preferably in the form of ridges or beads, wherein the further embossing of the elongate raised structures (31, 32) into the adhesive layer forms a further complementary pattern comprising one or more major channels , wherein the main channels communicate with said channel system (41, 42).

4. Cover according to claim 3, characterized in that said elongate raised structures (31, 32) are rectilinear, preferably in a parallel arrangement. or that they are undulating or in the form of curved lines.

5. Cover according to claim 4, characterized in that said elongated raised structures (31, 32) extend in a straight line in a grid-shaped arrangement, preferably in a rectangular or diamond-shaped arrangement.

6. Cover according to one of claims 2 to 5, characterized in that its surface (2) two or more, juxtaposed or successively arranged repeating units each having at least two übereinanderge- superimposed three-dimensional patterns (10, 20), wherein between the adjacent repeating units elongate raised structures (33, 33, 33 ", 34, 34") run.

7. Cover according to one of the preceding claims, characterized in that at least one of said patterns, preferably all of the said pattern, can be produced by means of embossing method / are.

8. Cover according to claim 7, characterized in that the / said pattern (s) can be produced by means of an embossing roll or an embossing plate.

9. Cover according to one of the preceding claims, characterized in that said first pattern is an irregular pattern, preferably in the form of an orange peel structure.

A cover according to claim 9, characterized in that it comprises at least one said further three-dimensional pattern printed on the irregular first pattern or on the orange-skin structure.

11. Cover according to one of the preceding claims, characterized in that the provided with said raised structures surface (2) is coated dehäsiv, preferably by means of siliconization.

A cover according to any one of the preceding claims, characterized in that the height of the raised structures is in the range 5 to 500 μm, preferably 10 to 100 μm, measured in each case from the plane of that surface area immediately surrounding the raised structure.

13. Cover according to one of the preceding claims, characterized in that the raised structures (11, 12) of the first pattern (10) have a maximum length in the range of 0.05 to 10 mm, preferably from 0.1 to 1 mm.

14. Cover according to one of the preceding claims, characterized in that the raised structures of the second or further pattern (20) have a maximum length in the range of 0.05 to 10 mm, preferably from 0.1 to 1 mm.

15. Cover according to one of the preceding claims, characterized in that the surface density of the raised structures of the first pattern (10) and / or the second pattern (20) in the range of 1 to 100 cm ~ 2, preferably from 5 to 25 cm " ² , lies.

16. Cover according to one of the 'preceding claims, characterized in that the surface portion of the raised structures of the first pattern (10) and / or the second mister (20) in the range of 0.1 to 50%, preferably in the range from 1 to 10%.

17. Cover according to one of the preceding claims, characterized in that the elongated raised structures (31, 32) have a length in the range of 0.5 cm to 2 m, preferably from 10 cm to 50 cm.

An adhesive product comprising an adhesive layer (80) covered with a cover (60) according to any one of claims 1 to 17 or covered with such a cover and in the surface thereof the corresponding complementary one (n) pattern is / are imprinted.

19. Adhesive product according to claim 17, characterized in that the surface of the adhesive layer after removal the cover has a coherent channel system (41, 42) which is produced by the impressing of the said pattern (s) and which leads to a discharge of gaseous or liquid substances or substance mixtures, in particular of air, to the Edges of the adhesive layer allows.

20. Adhesive product according to claim 18 or 19, in the form of an adhesive tape or an adhesive film, in each case one-sided or double-sided adhesive.

21. Adhesive product according to one of claims 18 to 20, characterized in that the flow properties of the adhesive layer (80) are such that the embossed by the cover complementary pattern even after the detachment of the cover from the

Adhesive layer remain in this, at least for a period of 5 minutes after peeling, preferably at least for a period of 30 minutes after peeling, each at an ambient temperature of 15 to 25 ⁰ C.

22. Use of a cover according to one of claims 1 to 17 for the production of single- or double-sided adhesive products, preferably of adhesive tapes or adhesive films.

23. A method for producing a cover according to one of claims 1 to 17, characterized by the following steps:

Providing a web of material having a surface (2) with a first pattern (10) comprising a plurality of raised structures (11, 12) irregularly shaped and randomly distributed in the surface, preferably in the form of a Orange peel structure; Generating at least one further three-dimensional pattern (20) in said surface (2), wherein the further pattern (20) is superimposed on said first pattern (10) and comprises a plurality of raised structures (21, 22) which are regularly or irregularly shaped and distributed in a regular or random arrangement in the surface, and wherein the further pattern (20) is superimposed on the first pattern (10) in such a way that the raised structures (21, 22) of the further pattern communicate with the raised structures (11, 12) of the first pattern.

24. A method according to claim 23, characterized in that the cover is additionally provided with a further three-dimensional pattern superimposed on said first pattern (10) and said further pattern (20) and said one or more elongate raised structures (31, 32), preferably in the form of ridges or beads, the further pattern being superposed with said patterns (10, 20) such that the elongate raised structures (31, 32) are aligned with the raised structures (11 , 12) of the first pattern (10) and / or with the raised structures (21, 22) of the pattern (20).

25. A method according to claim 23 or 24, characterized in that said raised structures of the other three-dimensional pattern (s), or at least some of these structures, are produced by an embossing process, preferably using an embossing roll or an embossing plate.

26. The method according to any one of claims 23 to 25, characterized in that said raised structures of the / the other three-dimensional pattern (s), or at least some of these structures are generated by a printing process.

27. The method according to any one of claims 23 to 26, characterized in that the intended for contact with an adhesive layer side of the cover by means of silicization or fluorosiliconization is treated.

28. A method for reducing the risk of the formation of inclusions of gaseous or liquid substances, in particular air pockets, when bonding an adhesive product to a substrate, characterized by the following steps:

- Providing a cover according to one of claims 1 to 17;

Removing the cover from the adhesive surface of the adhesive product, wherein complementary structures in the form of depressions are formed by the raised structures in the adhesive layer, and wherein the complementary structures embossed into the adhesive layer are at least temporarily retained even after the cover has been detached from the adhesive layer stay;

29. A method for reducing the risk of the formation of inclusions of gaseous or liquid substances, in particular air pockets, in the bonding of an adhesive product to a substrate, characterized by the following steps:

- Providing a cover according to one of claims 1 to 17; Providing an adhesive product whose adhesive surface has a structure similar to that in the coverage of existing three-dimensional pattern is at least partially complementary;

- placing the cover on the adhesive surface of the adhesive product in such a way that the raised structures of the cover are placed on the complementary structures present in the adhesive surface;

Peeling off the cover from the adhesive surface of the adhesive product, wherein complementary structures in the form of depressions are formed by the raised structures in the adhesive layer, and wherein the complementary structures embossed into the adhesive layer at least also after the cover has been detached from the adhesive layer to be temporarily preserved; - contacting the adhesive surface of the adhesive article with a surface of the substrate resulting in an adhesive bond.

30. A process for producing an adhesive product, characterized by the following steps:

- Providing a cover according to one of claims 1 to 17;

- placing the cover on an adhesive surface of the adhesive product in such a way that the raised structures of the cover are pressed into the adhesive surface.

31. A method for producing an adhesive product, characterized by the following steps: - providing a cover according to one of claims 1 to 17;

Applying a liquid adhesive mass to the surface of the cover provided with said three-dimensional structures; - Solidification of the adhesive composition to form a

Adhesive pushes, passing through the raised structures in the embossing layer complementary embossed structures are formed in the form of an open channel system.

32. Method for producing an adhesive product, characterized by the following steps:

- Providing an adhesive layer which is connected to a cover, which has on the side facing the adhesive layer, a first Nüster according to claim 1;

Producing at least one further three-dimensional pattern according to claim 1, by embossing this pattern in the cover from the side which faces away from the adhesive layer, the embossing of the further pattern simultaneously effecting embossing of the adhesive layer.