DE102015112206A1 - Mounting tape and use of mounting tape for the printing industry - Google Patents

Abstract

An assembly adhesive tape (10) for the printing industry is specified. The adhesive tape comprises a foam layer (1), a reinforcing carrier layer (2) arranged on the foam layer (1) and a first adhesive layer (3) arranged on the carrier layer (2). The carrier layer (2) has a tensile force of at least 1 N at 1% elongation in the longitudinal direction and at the same time a tear propagation resistance of more than 0.2 N in the longitudinal and / or transverse direction. The invention further relates to the use of the assembly adhesive tape (10) for the printing industry.

Description

The invention relates to a mounting tape and its use for the printing industry.

In today's usual printing processes, such as for newspaper or book printing, replaceable printing plates are used. The printing plates can be applied to flat substrates or, in the case of flexible printing plates, also to printing rollers. For printing, the printing plate is colored and finally contacted with the material to be printed. Assembly adhesive tapes are required for the application and fixing of the exchangeable printing plates.

Usually, assembly tapes are used for this purpose, which have a foam layer which is reinforced with a film.

Polyethylene films are often used as the reinforcing film. While polyethylene (PE) based foils provide a good print image, they can usually not be removed from the substrate without being destroyed after use. For example, there may be problems with the release of pressure rollers. In addition to PE-based films, polyester-based films (PET) are also used. For example, oriented polyester films (o-PET) can be used, oriented means that the films were stretched. Such films are usually easier to peel from the platen, but have no satisfactory printing properties, which is reflected in the printed image.

It is therefore an object of the invention to provide a mounting tape for the printing industry, which is improved in respect of the above-mentioned disadvantages.

This object is achieved by an adhesive tape according to the main claim 1. Further embodiments of the assembly adhesive tape and the use of the adhesive tape for the printing industry are the subject of further claims.

• – eine Schaumstoffschicht,
• – eine auf der Schaumstoffschicht angeordnete, verstärkende Trägerschicht und
• – eine auf der Trägerschicht angeordnete erste Klebeschicht umfasst,

wobei die Trägerschicht einen Zugwert einer Kraft von mindestens 1 N bei 1% Dehnung in Längsrichtung aufweist, und wobei die Trägerschicht zugleich eine Weiterreißfestigkeit von mehr als 0,2 N in Längs- und/oder Querrichtung aufweist.The invention relates to a mounting tape for the printing industry, wherein the adhesive tape

• A foam layer,
• - A arranged on the foam layer, reinforcing carrier layer and
• Comprising a first adhesive layer disposed on the carrier layer,

wherein the carrier layer has a tensile value of a force of at least 1 N at 1% elongation in the longitudinal direction, and wherein the carrier layer at the same time has a tear strength of more than 0.2 N in the longitudinal and / or transverse direction.

The mounting tape can be used, for example, for the application of a flat printing plate on a flat surface. For example, it can also be used for the application of a flexible printing plate on a pressure roller.

The carrier layer may be, for example, a multilayer carrier layer.

The term "on" may and in the following mean "directly on", i. the layers then have a common interface. But "on" can also mean that there are still one or more intermediate layers.

The term "longitudinal direction" corresponds to the English-language term "machine direction" or "MD", which is commonly used in the art. It generally refers to the direction of travel in the machine when processing films or other layers of material (such as fabric, nonwoven, polymer or laminate layers) which are fed into rolls over machines. The rolling up or unwinding takes place along this direction.

The direction perpendicular to the "longitudinal direction", however, is referred to as "transverse direction". The term "transverse direction" corresponds to the English-language term "cross direction" or "CD". Film or layered materials can have different properties in the longitudinal and transverse directions. In the following, direction-dependent material properties are therefore each set in relation to the longitudinal or transverse direction.

The term "elongation" denotes the ratio of length change (ΔL = L - L _U ) due to an applied tensile force to the original length (L _U ) of the carrier layer without tensile force.

The tensile values provide information about the tensile properties of the carrier layer. They indicate how great the force is that has to be expended in order to achieve a certain elongation of the carrier layer. The higher the tensile values, the higher the strength of the material. Low tensile materials are subject to greater elongation.

The determination of the tensile properties was carried out in the case of the present invention according to the measurement specifications of DIN EN ISO 527-3 (as of July 2003) , Accordingly, measurements were carried out to determine the tensile value (in N) with a sample width of 15 mm at a measuring speed of 500 mm / min and a pre-load of 0.1 N.

The tear strength or notch strength is the property of a substance, even in the presence of a notch tear further. The tear propagation strength thus indicates the force sufficient to further enlarge a notch or a crack.

The determination of the tear strength was carried out according to the measurement specifications of DIN 53356 (as of August 1982) , Accordingly, measurements were made with a support layer having a width of 50 mm and a length of 100 mm at a measuring speed of 300 mm / min.

The inventors of the present invention have found that adhesive tapes according to the invention have a carrier layer which has a tensile force of at least 1 N at 1% elongation in the longitudinal direction and at the same time has a tear propagation resistance of more than 0.2 N in the longitudinal and / or transverse direction, equally allow a good print image and allow improved detachment.

The inventors have recognized that a sufficient softness or elasticity of the carrier layer is required to achieve a good print image. This results from the need for a good print image requirement that the carrier layer should not distribute the locally acting pressure on the entire surface of the foam layer during printing, but should only be deformed at the point at which the pressure acts on the mounting tape , Soft or elastic carrier layers thus lead to a good print quality. This explains the good printing properties when using conventional adhesive tapes with PE films as support layers.

The inventors have found, however, that the use of soft carrier layers, such as a PE film, a non-destructive and therefore user-friendly detachment does not allow because they have too low strength.

The inventors have found that mounting tapes according to the invention with a tensile force of at least 1 N at 1% elongation in the longitudinal direction while still soft and elastic enough to allow a print image of very good quality, but at the same time already have a strength that a simpler Removal of the adhesive tape allowed after use. For example, mounting tapes according to the invention allow a simpler detachment of pressure rollers after use. Carrier layers with a tensile force of less than 1 N at 1% elongation in the longitudinal direction, on the other hand, have proven to be too soft and indeed permit a good print image but no favorable properties when the adhesive tape is removed after printing.

The inventors have also observed that a tear strength of more than 0.2 N in the longitudinal and / or transverse direction is required in order to allow a good release behavior but also a good printed image. A carrier layer which has a high tear propagation resistance is thus a carrier layer which, even in the case of an incision, presents a high resistance to tearing. The inventors have found that tear strength greater than 0.2 N is required for good release performance.

For the behavior of the carrier layer, the interaction of tensile strength and tear strength is decisive. Only if the tensile value is at least 1 N at 1% elongation and at the same time the tear propagation resistance is more than 0.2 N does the material have the required mechanical properties.

According to one embodiment of the invention, the carrier layer, which may also be multilayer or multilayer, has a total basis weight of 20 to 100 g / m ² , preferably 20 to 50 g / m ² , more preferably 20 to 30 g / m ² , on most preferably 22 to 28 g / m ² .

The inventors of the present invention have found that carrier layers which, in addition to the previously described tensile strengths and resistance to traveling, have a basis weight of at least 20 g / m ² , have a particularly good strength and thus can be peeled off again particularly easily by a pressure roller. Basis weights of less than 100 g / m ² have a positive effect on the printed image in addition to the associated savings in material.

In another embodiment, the thickness of the carrier layer is between 10 and 400 .mu.m, preferably between 20 and 250 .mu.m, more preferably between 30 and 150 .mu.m, even more preferably between 40 and 100 .mu.m, most preferably between 50 and 80 .mu.m. These thickness ranges have proven to be particularly favorable for the carrier layer and its mechanical properties. Measuring specifications for the thickness determination can be found in the DIN 53370 (as of November 2006) , An estimate of the thickness with good reliability is also possible on the basis weight.

Another development of the invention relates to the mounting tape according to the invention, wherein the carrier layer has a tensile value of a force of 1.5 N at 1% elongation in the longitudinal direction. Such carrier layers have an even higher strength, which further has a positive effect on the detachment behavior. At the same time, however, such materials are still soft and elastic enough for good printing properties.

A further embodiment of the assembly adhesive tape according to the invention has a carrier layer which has a tear propagation resistance of more than 0.5 N, preferably greater than 1 N, more preferably greater than 2 N and most preferably greater than 3 N in the longitudinal direction and / or transverse direction.

Such carrier layers provide for a particularly good reinforcement of the foam layer and in combination with the good tensile properties of the carrier layer of the adhesive tape according to the invention for a significantly better detachment.

Carrier layers which have the stated values for the tear propagation strengths in each case both for the longitudinal direction and for the transverse direction are particularly preferred.

In another development of the invention, the carrier layer has a tensile force of a force of 5 N to 19 N, preferably of 6 N to 18 N, more preferably of 7 to 17 N at 10% elongation in the longitudinal direction. The inventors have recognized that, especially in the case of tensile properties, the best mechanical properties for both print quality and the release process can be achieved in the ranges specified for the tensile value. Too low tensile values lead to carrier layers that are too easy to stretch and thus less easily removed. Too high a tensile strength indicates a lower elasticity.

Another embodiment of the adhesive tape according to the invention comprises a carrier layer, wherein the carrier layer has a tensile value of a force of at least 8 N, preferably at least 9 N, more preferably at least 10 N at 25% elongation in the longitudinal direction. Tensile values of at least 8 N or higher at 25% elongation in the longitudinal direction show particularly favorable mechanical properties and resistances.

A further embodiment of the assembly adhesive tape according to the invention has a carrier layer, wherein the carrier layer in the longitudinal and transverse direction has an elongation at break of less than 1000%, preferably less than 600%, even more preferably less than 300%.

Even elongations of less than 80% are possible. In contrast, for example, conventional adhesive tapes with an o-PET support layer often have significantly higher elongation at break.

The determination of the elongation at break as another central tensile property in addition to the tensile value was carried out in the case of the present invention as well as the tensile value according to the measurement specifications of DIN EN ISO 527-3 (as of July 2003) ,

Elongation at break is a material characteristic that indicates the permanent extension of the sample to break, relative to the initial gauge length.

It therefore also provides information about the strain and elasticity as well as stability behavior of the sample.

The inventors of the present invention have found that an elongation at break of less than 1000% or even smaller is particularly advantageous.

In a further embodiment, the material of the carrier layer of the inventive adhesive tape has a modulus of elasticity (modulus of elasticity) in the longitudinal and transverse directions of less than 4000 N / mm ² , more preferably less than 1000 N / mm ² , most preferably less as 200 N / mm ² . In addition, the carrier layer preferably has an E-modulus of at least 20 N / mm ² , preferably at least 30 N / mm ² .

The modulus of elasticity was calculated from the tensile properties data, ie the tensile value and the material cross-sectional area.

The modulus of elasticity provides information about the elongation as a function of the applied tensile stress. It makes a statement about the elasticity of the backing material used. It has been found that materials of the mentioned values for the modulus of elasticity are particularly elastic and thus allow particularly good print quality.

According to another preferred embodiment, the tensile strength of the carrier layer in the longitudinal direction is less than 30 N, more preferably less than 20 N.

The tensile strength is the tensile force at which the carrier layer breaks. Materials with particularly high breaking forces are usually not flexible enough to allow a good print image.

In a preferred embodiment of the assembly adhesive tape according to the invention, the carrier layer comprises a woven or nonwoven fabric layer or a laminate containing the woven or nonwoven fabric layer. In particular, it can be a continuous, continuous fabric or nonwoven fabric layer or a laminate comprising a continuous fabric or nonwoven fabric layer. A "continuous layer" may in particular be understood as meaning a continuous fabric or nonwoven fabric layer which has no openings and is thus mechanically particularly stable.

Carrier layers comprising a nonwoven layer or a laminate comprising a nonwoven layer are particularly preferred. Nonwoven fabric layers comprise fibers, which may be, for example, polymer fibers which, in contrast to the fibers, are not woven in a woven fabric (henceforth also called "nonwoven" in English) but are laid arbitrarily without being woven into one another. These layers therefore have a different structure than tissue layers which have a regular tissue structure. Nonwovens are not only inexpensive and easy to produce, but also have significantly higher tensile strengths compared to conventional films based on polyolefin layers, which are not nonwovens.

For fabric and nonwoven layers, a variety of different polymers and polymer fibers are useful in the present invention. For example, polyolefins, polyamides or polyesters such as e.g. Polyethylene terephthalate or polybutylene terephthalate can be used.

However, it is particularly preferred if the woven or nonwoven fabric layer comprises fibers comprising a polyolefin. The inventors of the present invention have observed that woven and nonwoven fabric layers based on polyolefins, in particular based on polyethylene, polypropylene, polybutylene and polyisobutylene, are particularly well suited for achieving optimum elasticity and tensile properties of the backing layer, polyethylene and polypropylene most preferred.

According to another development, the one fabric or nonwoven fabric layer may have a basis weight of 10 to 50 g / m ^2, preferably 11 to 25 g / m ² , more preferably 12 to 20 g / m ² . Tissue or nonwoven fabric layers with the surface weights mentioned allow the desired mechanical properties to be achieved and moreover have a thickness which is particularly well suited for the applications of adhesive tapes according to the invention during the printing process.

A particularly preferred embodiment of the invention relates to the adhesive tape of the invention comprising a backing layer which comprises a laminate which has a polymer layer in addition to the woven or nonwoven fabric layer. The polymer layer may be preferably a continuous polymer layer designed as a polymer film. For example, both the fabric or nonwoven layer and the polymer layer may be continuous layers that are in direct contact with each other.

The inventors of the present invention have found that a laminate comprising both a fabric or nonwoven layer and a polymer layer is most conveniently mechanical Properties for carrier layers of mounting tapes allowed. The combination can be achieved at the same time excellent elasticity, as it is indispensable for a good print image. At the same time, it is also possible to achieve a strength which satisfies the high demands on detachment from the pressure roller after the printing operation. Assembly adhesive tapes comprising a backing layer comprising or consisting of said laminate permit significantly improved release from the printing roll as well as good quality of the printed image. The mechanical characteristics, for example with regard to the tensile properties and the tear propagation resistance, are particularly favorable for this type of carrier layers.

The inventors have found that in this way, surprisingly, the advantages of conventional adhesive tapes in which a foam layer is reinforced with PE films (good print image) and adhesive tapes in which the foam layer is reinforced with o-PET films (non-destructive detachment from the pressure roller ) can be combined with each other, without causing the respective disadvantages.

The laminate may comprise or consist of the woven or nonwoven layer and the polymer layer. The laminate can be produced, for example, by extruding the polymer layer onto the woven or nonwoven layer. The laminate may be disposed within the adhesive tape such that the fabric or nonwoven fabric layer is on the side of the foam layer while the polymer layer of the laminate is on the side of the first adhesive layer of the adhesive tape. This arrangement is particularly suitable since a comparatively smooth surface on the side of the first adhesive layer is achieved in this way. However, the reverse arrangement in which the polymer layer on the side of the foam layer and the fabric or nonwoven layer on the side of the first adhesive layer is equally suitable.

According to another preferred development, the polymer layer of the laminate comprises a polyolefin, in particular polyethylene or polypropylene or copolymers thereof. These materials are not only inexpensive, but also preferable in terms of their mechanical properties.

More preferably, in the laminate, both the fibers of the woven or nonwoven fabric layer and the polymer layer each independently comprise a polyolefin, each of which may be, for example, polyethylene and / or polypropylene.

It is most preferred if the laminate comprises a nonwoven fabric layer comprising or consisting of PE or PP and if the laminate at the same time contains or consists of a polymer layer comprising PE or PP. In this way, the layers can simply be connected to each other permanently and consistently.

This is possible for example by an extrusion coating, wherein the polymer layer is extruded onto the nonwoven fabric layer. An intimate connection of the layers can be effected in particular by melting the polymer layer onto the nonwoven fabric layer.

Another embodiment of the present invention relates to the assembly adhesive tape according to the invention, wherein the foam layer comprises a polymer. Basically, all common foam polymers are used, as they are used in conventional adhesive tapes in printing technology. However, particularly suitable are foam layers containing foams based on polyacrylate, polyurethane, polyethylene, polypropylene or copolymers based on ethylene and propylene. Also possible are foams based on synthetic rubber or silicone-based foams.

For example, the foam layer may comprise a foam material having a density between 0.03 and 0.8 g / cm ³ , preferably between 0.06 and 0.7 g / cm ³ , more preferably between 0.09 and 0.3 g / cm ³ .

According to another embodiment, the thickness of the foam layer is at least 0.1 mm, preferably at least 0.2 mm, more preferably at least 0.5 mm.

According to a further embodiment, the thickness of the foam layer is at most 25 mm, preferably less than 10 mm, more preferably less than 5 mm, more preferably less than 2 mm. The thickness can also be less than 1 mm.

According to another development, the adhesive tape according to the invention has a second adhesive layer on the side of the foam layer facing away from the carrier layer.

Such a mounting tape thus has at least two adhesive layers. The first adhesive layer, which is arranged on the carrier layer and the second adhesive layer, which is arranged on the foam layer and that on the side facing away from the carrier layer of the foam layer. For example, it is possible that the first adhesive layer is arranged directly on the carrier layer and the second adhesive layer is arranged directly on the foam layer.

An adhesive tape with two adhesive layers can be glued with one of the adhesive layers on the substrate for printing, in particular on a pressure roller. With the second adhesive layer then the pressure plate, in particular a flexible pressure plate can be mounted on the pressure roller. The adhesive layers may have, for example, different adhesives. The adhesive tape according to the invention is preferably attached to the printing roll via the second adhesive layer-which frequently has a metal or steel surface-while the first adhesive layer serves to attach and fix the printing plate.

In another embodiment of the adhesive tape according to the invention, the foam layer and the carrier layer are connected to one another via an adhesion promoter layer, which is likewise an adhesive layer.

In a different embodiment, the foam layer and the carrier layer are connected directly to each other via a common interface. In this case, the application of the two layers to each other during the manufacture of the adhesive tape can be carried out thermally. The two layers are heated in this case, contacted in a heated state and thus permanently connected to each other.

Adhesives for the adhesive layers of the assembly adhesive tape are in each case independently of one another in particular pressure-sensitive adhesive materials, e.g. based on acrylic, vinyl ether, natural or synthetic rubber based materials, poly (alpha olefins) and silicones.

A preferred embodiment of the adhesive tape according to the invention relates to an adhesive tape, wherein the first adhesive layer has a regular or irregular structure, in particular grooves or ridges.

By structuring the adhesive layer, it is possible to use air which is present in the adhesive tape, e.g. enclosed between the adhesive layer and further layers is to guide so that they can easily escape during printing. This is advantageous to avoid unwanted air pockets that can interfere with printing.

Furthermore, if the adhesive tape has a second adhesive layer, it is also possible for it to have a regular or irregular structure, in particular grooves or ridges.

According to a further preferred embodiment of the assembly adhesive tape according to the invention, a cover layer can be arranged on the first adhesive layer. This topcoat can be removed before use. It allows to cover the adhesive tape according to the invention and thus to protect the first adhesive layer (release liner). In particular, such a cover layer makes it possible for the adhesive tape to be rolled up and thus easier to store and transport.

For example, it is possible for the cover layer to have a structure on the side facing the first adhesive layer. For example, it is possible to achieve a structuring of the adhesive layer via the structure of the cover layer.

The invention also relates to the use of the assembly adhesive tape according to the invention for the printing industry. The adhesive tapes according to the invention are suitable for printing processes, since they are suitable for obtaining images of good print quality.

In addition, a use of the assembly adhesive tape according to the invention for the application of a flexible printing plate on a pressure roller is particularly preferred.

The printing plate can be, for example, so-called clichés, as are commonly used in high-pressure technology. For example, the printing plate may be a photopolymer or rubber or consist thereof. The pressure roller may, for example, have a surface comprising a metal. For example, the pressure roller may have a steel surface.

Particularly preferred is the use of the mounting tape according to the invention for the so-called flexographic printing process. The adhesive tapes according to the invention can be used, for example, for applying and fixing flexographic printing plates and allow the flexographic printing process to meet high standards of print quality and user-friendly installation before and easy removal of the adhesive tape after printing.

In the following, the invention will be explained in more detail with reference to embodiments and figures. Preferred embodiments of the invention are illustrated in the figures and will be explained in more detail below.

1 shows a schematic representation of an adhesive tape according to the invention ( 10 ) for the application and fixation of a printing plate. The adhesive tape has at least one foam layer ( 1 ) on. On the foam layer ( 1 ) is a carrier layer ( 2 ), which the foam layer ( 1 ) and thus increases the stability of the adhesive tape. For example, the carrier layer ( 2 ) may be arranged directly on the foam layer. Finally, the adhesive tape has at least one adhesive layer ( 3 ) on. This first adhesive layer ( 3 ) is on the carrier layer ( 2 ) arranged. For example, it can directly on the carrier layer ( 2 ) can be arranged. The carrier layer ( 2 ) must have defined mechanical properties. It is characterized by a tensile force of at least 1 N at 1% elongation in the longitudinal direction and at the same time has a tear propagation resistance of more than 0.2 N in the longitudinal and / or transverse direction.

2A and 2 B show schematic representations of two further embodiments of the assembly adhesive tape according to the invention ( 10 ) comprising a foam layer ( 1 ), a carrier layer and at least a first adhesive layer ( 3 ), wherein the carrier layer ( 2 ) in each case a laminate ( 2a . 2 B ) or from a laminate ( 2a . 2 B ) consists. The laminate in each case has a woven or nonwoven layer ( 2a ), nonwoven fabric layers being particularly well suited due to their favorable mechanical properties. The laminate additionally has a polymer layer ( 2 B ) on. It is preferred that the polymer layer ( 2 B ), which may, for example, have a smooth surface forming the outer layer on which the first adhesive layer ( 3 ) ( 2A ). But also the reverse arrangement ( 2 B ) is equally suitable.

3A and 3B show schematic representations of two further embodiments of the adhesive tape according to the invention ( 10 ). 3A shows an inventive adhesive tape as in 1 but additionally comprising a second adhesive layer ( 4 ), which on the of the carrier layer ( 2 ) facing away from the foam layer ( 1 ) is arranged. For example, the second adhesive layer ( 4 ) a common interface to the foam layer ( 1 ) exhibit. This arrangement makes it possible to apply and fix a printing plate without the use of other adhesive materials. The carrier layer ( 2 ) the in 3A As shown in a further preferred variant, a laminate (as shown in FIGS 2A or 2 B shown). The adhesive tape according to the invention ( 10 ) but besides a first and second adhesive layer ( 3 . 4 ) have further adhesive layers. In particular, it is possible - as in 3B shown - that individual layers of the adhesive tape are joined together by a primer layer. In particular, a primer layer ( 5 ) between the foam layer ( 1 ) and the carrier layer ( 2 ) can be arranged. Also in this case, the backing layer may have a laminate or be made of a laminate (as in FIGS 2A or 2 B shown).

4 schematically shows a section of a printing device, as used in the printing industry for book or newspaper printing for example. The printing process can, for example, by means of a pressure roller ( 12 ), which is also referred to as a plate cylinder. On the pressure roller ( 12 ) the pressure plate ( 11 ) applied and fixed. This is achieved by the adhesive tape according to the invention ( 10 ). The printing plates ( 11 ) can be provided with a dye, for example, by contact with another roller (eg a so-called anilox roller, not shown). The printing process can be combined with another roller ( 13 ), which is also referred to as an impression cylinder. The initially unprinted material ( 14a ) is passed over the roller ( 13 ) comes there with the on the pressure roller ( 12 ) mounted and colored printing plate ( 11 ) and can then be printed ( 14b ) and edited. From the arrangement it can be seen that the adhesive tape ( 10 ) plays an important role in the printing process due to its arrangement and influences the printed image. The adhesive tape according to the invention ( 10 ) not only allows easy installation and good print quality but also facilitates replacement of the printing plates ( 11 ) because of its easy detachability.

5 compares measurements of tensile properties made on different reinforcing carrier layers, where the tensile value in% for elongation in% is related. The measurements each relate to the properties in the longitudinal direction. The measurements were carried out in each case on the films or laminates, which form the carrier layers in an adhesive tape - without the other constituents of the adhesive tape (foam layer, adhesive layers, etc.) - to allow better comparability and reproducibility. The properties of the reinforcing carrier layers have proven to be central to the print image quality and the release behavior of the mounting tapes. Inventive mounting tapes have reinforcing carrier layers whose tensile properties in a wide by the in 5 schematically framed limited area. For example, the range may include tensile properties of at least 1 N at 1% strain to a force of 18 N at 25% strain in the MD.

The material properties of the tested films (Reference Examples 1 and 2a) and laminates (Examples 1 and 2) are summarized in Table 1.

The measurement data prove that PE films experience a high elongation in the longitudinal direction even with very little effort. PE foils are very elastic and soft and therefore show good properties during printing, but not under high tensile loads in the removal of the pressure roller after use.

On the other hand, o-PET films are oriented polyester films that deform only when high tensile forces are applied. Their high strength allows for easier release from the pressure roller, but it is also the cause of a reduced quality of the printed image. In addition, o-PET films offer very low tear propagation resistance with their high tensile strength.

In contrast, the inventors of the present invention have recognized that tensile properties intermediate those of PE and o-PET films offer the best mechanical properties for adhesive tapes in printing processes. Surprisingly, the advantages of various conventional systems can be combined in this way. The area with the most suitable mechanical characteristics is in the graph of 5 schematically drawn. Surprisingly, tensile values in the range between the tensile values for the conventionally used PE films and o-PET films, wherein the outline in the diagram here serves to illustrate this principle, are particularly suitable. The tensile properties of two examples of carrier layers according to the invention which are laminates are described in 5 "Nonwoven PE laminate I" (Example 1) and "Nonwoven PE laminate II" (Example 2). In both cases, it is a laminate, each having a polypropylene non-woven with a basis weight of 12g / m ² , as well as an applied by extrusion polymer layer of polyethylene with a weight of 12g / m ² . The carrier layers each have a total basis weight of 24 g / m ² . Both carrier layers are characterized by a tensile behavior that lies between that of the conventional carrier films PE and o-PET. The inventors have found that these tensile properties in combination with the good tear propagation strengths obtained (see Table 2 in FIG 6 ) allow to obtain optimal mechanical properties for the printing process and the handling of the adhesive tape.

The tested carrier films are described in Table 1. Table 1: Films for carrier layers in adhesive tapes description description Thickness [μm] Density [g / cm3] Reference Example 1: PE film Blown film of 30% LLDPE (Sabic LLDPE 118 NE from SABIC) and 70% LDPE (Lupolen 2420F from Lyondellbasell) 25 0.922 Reference Example 2a: "o-PET Film I" Oriented polyester film from Mitsubishi 12 1.4 Reference Example 2b: "o-PET Film II" Oriented polyester film from Mitsubishi 23 1.4 Example 1: "Nonwoven PE Laminate I" 12 g / m ² polypropylene fleece with 12 g / m ² extruded polyethylene layer from Infiana 70 n / A Example 2: "Nonwoven PE Laminate II" 12 g / m ² polypropylene fleece with 12 g / m ² extruded polyethylene layer from Infiana 70 n / A

A comprehensive comparison of the properties of the examples and reference examples for both the "MD" longitudinal direction and the CD "CD" transverse direction are summarized in Table 2, which are incorporated herein by reference 6 is shown.

The production of assembly tapes according to the invention can be carried out, for example, as follows. First, the foam layer (e.g., a PE or PP foam layer as can be obtained commercially) and the backing layer are provided.

The carrier layer may be a laminate as described. To produce laminates of the invention, a fabric or nonwoven fabric layer is provided, to which a polymer layer is applied and fixed. In the case of Examples 1 and 2, a nonwoven fabric layer of polypropylene was used in each case. Such nonwoven fabric layers can be prepared by conventional methods or purchased commercially. On the fabric or nonwoven fabric layer is then the polymer layer by z. B. applied extrusion coating. By melting a good permanent connection can be achieved. In the case of Examples 1 and 2, in each case a PE polymer layer was extruded onto the PP nonwoven fabric layer and subsequently melted.

The support layer thus obtained may then either be adhered to the foam layer or thermally bonded thereto by reflow. In the case of sticking, a primer layer is first applied to either the backing or foam layer and then the layers are bonded.

Finally, the first adhesive layer is applied to the carrier layer. Analogously, the second adhesive layer can be applied to the foam layer.

The invention is not limited by the description with reference to the embodiments. Rather, the invention encompasses any novel feature as well as any combination of features, including in particular any combination of features in the claims, even if this feature or combination itself is not explicitly stated in the patent claims or exemplary embodiments.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• DIN EN ISO 527-3 (as of July 2003) [0015]
• DIN 53356 (as of August 1982) [0017]
• DIN 53370 (as of November 2006) [0026]
• DIN EN ISO 527-3 (as of July 2003) [0035]

Claims (18)

Mounting tape ( 10 ) for the printing industry, wherein the adhesive tape - a foam layer ( 1 ), - on the foam layer arranged, reinforcing carrier layer ( 2 ) and - one on the carrier layer ( 2 ) arranged first adhesive layer ( 3 ), wherein the carrier layer ( 2 ) has a tensile force of a force of at least 1 N at 1% elongation in the longitudinal direction, and wherein the carrier layer ( 2 ) at the same time has a tear propagation resistance of more than 0.2 N in the longitudinal and / or transverse direction. Mounting tape ( 10 ) according to the preceding claim, wherein the carrier layer ( 2 ) has a basis weight of 20 to 100 g / m ² , preferably 20 to 50 g / m ² . Mounting tape ( 10 ) according to one of the preceding claims, wherein the carrier layer ( 2 ) has a tensile force of at least 1.5 N at 1% elongation in the longitudinal direction. Mounting tape ( 10 ) according to one of the preceding claims, wherein the carrier layer ( 2 ) has a tear strength of more than 0.5 N, preferably greater than 1 N in the longitudinal and / or transverse direction. Mounting tape ( 10 ) according to one of the preceding claims, wherein the carrier layer ( 2 ) has a tensile force of 5N to 19N, preferably 6N to 18N, at 10% elongation in the longitudinal direction. Mounting tape ( 10 ) according to one of the preceding claims, wherein the carrier layer ( 2 ) has a tensile force of at least 8 N, preferably at least 9 N, at 25% elongation in the longitudinal direction. Mounting tape ( 10 ) according to one of the preceding claims, wherein the carrier layer ( 2 ) in the longitudinal and transverse direction has an elongation at break of less than 1000%, preferably less than 600%. Mounting tape ( 10 ) according to one of the preceding claims, wherein the carrier layer ( 2 ) a fabric or nonwoven layer ( 2a ) or a laminate containing the woven or nonwoven layer ( 2a ). Mounting tape ( 10 ) according to claim 8, wherein the woven or nonwoven fabric layer ( 2a ) Comprising fibers comprising a polyolefin, in particular polyethylene or polypropylene. Mounting tape ( 10 ) according to claim 8 or 9, wherein the fabric or nonwoven fabric layer ( 2a ) has a basis weight of 10 to 50 g / m ^2, preferably from 11 to 25 g / m ² . Mounting tape ( 10 ) according to any one of claims 8 to 10, wherein the laminate in addition to the fabric or nonwoven layer ( 2a ) a polymer layer ( 2 B ) having. Mounting tape ( 10 ) according to claim 11, wherein the polymer layer ( 2 B ) of the laminate has a polyolefin, in particular polyethylene or polypropylene. Mounting tape ( 10 ) according to one of claims 1 to 11, wherein the foam layer ( 1 ), a polymer, in particular at least one of the polymers selected from the group: polyacrylate, polyethylene, polypropylene and polyurethane. Mounting tape ( 10 ) according to one of claims 1 to 13, additionally comprising a side of the foam layer facing away from the carrier layer ( 1 ) arranged second adhesive layer ( 4 ). Mounting tape ( 10 ) according to one of claims 1 to 14, wherein the first adhesive layer has a regular or irregular structure, in particular grooves or burrs. Use of mounting tape ( 10 ) of claims 1 to 15 for the printing industry. Use of mounting tape ( 10 ) according to the preceding claim for the application of a printing plate ( 11 ) on a pressure roller ( 12 ). Use of mounting tape ( 10 ) according to one of claims 16 or 17 in the context of the flexographic printing process.

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